---
_id: '11816'
abstract:
- lang: eng
text: In recent years, significant advances have been made in the design and analysis
of fully dynamic maximal matching algorithms. However, these theoretical results
have received very little attention from the practical perspective. Few of the
algorithms are implemented and tested on real datasets, and their practical potential
is far from understood. In this paper, we attempt to bridge the gap between theory
and practice that is currently observed for the fully dynamic maximal matching
problem. We engineer several algorithms and empirically study those algorithms
on an extensive set of dynamic instances.
alternative_title:
- LIPIcs
article_number: '58'
article_processing_charge: No
arxiv: 1
author:
- first_name: Monika H
full_name: Henzinger, Monika H
id: 540c9bbd-f2de-11ec-812d-d04a5be85630
last_name: Henzinger
orcid: 0000-0002-5008-6530
- first_name: Khan
full_name: Shahbaz, Khan
last_name: Shahbaz
- first_name: Richard
full_name: Paul, Richard
last_name: Paul
- first_name: Christian
full_name: Schulz, Christian
last_name: Schulz
citation:
ama: 'Henzinger MH, Shahbaz K, Paul R, Schulz C. Dynamic matching algorithms in
practice. In: 8th Annual European Symposium on Algorithms. Vol 173. Schloss
Dagstuhl - Leibniz-Zentrum für Informatik; 2020. doi:10.4230/LIPIcs.ESA.2020.58'
apa: 'Henzinger, M. H., Shahbaz, K., Paul, R., & Schulz, C. (2020). Dynamic
matching algorithms in practice. In 8th Annual European Symposium on Algorithms
(Vol. 173). Pisa, Italy: Schloss Dagstuhl - Leibniz-Zentrum für Informatik. https://doi.org/10.4230/LIPIcs.ESA.2020.58'
chicago: Henzinger, Monika H, Khan Shahbaz, Richard Paul, and Christian Schulz.
“Dynamic Matching Algorithms in Practice.” In 8th Annual European Symposium
on Algorithms, Vol. 173. Schloss Dagstuhl - Leibniz-Zentrum für Informatik,
2020. https://doi.org/10.4230/LIPIcs.ESA.2020.58.
ieee: M. H. Henzinger, K. Shahbaz, R. Paul, and C. Schulz, “Dynamic matching algorithms
in practice,” in 8th Annual European Symposium on Algorithms, Pisa, Italy,
2020, vol. 173.
ista: 'Henzinger MH, Shahbaz K, Paul R, Schulz C. 2020. Dynamic matching algorithms
in practice. 8th Annual European Symposium on Algorithms. ESA: Annual European
Symposium on Algorithms, LIPIcs, vol. 173, 58.'
mla: Henzinger, Monika H., et al. “Dynamic Matching Algorithms in Practice.” 8th
Annual European Symposium on Algorithms, vol. 173, 58, Schloss Dagstuhl -
Leibniz-Zentrum für Informatik, 2020, doi:10.4230/LIPIcs.ESA.2020.58.
short: M.H. Henzinger, K. Shahbaz, R. Paul, C. Schulz, in:, 8th Annual European
Symposium on Algorithms, Schloss Dagstuhl - Leibniz-Zentrum für Informatik, 2020.
conference:
end_date: 2020-09-09
location: Pisa, Italy
name: 'ESA: Annual European Symposium on Algorithms'
start_date: 2020-09-07
date_created: 2022-08-12T07:13:25Z
date_published: 2020-08-26T00:00:00Z
date_updated: 2023-02-14T08:57:55Z
day: '26'
doi: 10.4230/LIPIcs.ESA.2020.58
extern: '1'
external_id:
arxiv:
- '2004.09099'
intvolume: ' 173'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://doi.org/10.4230/LIPIcs.ESA.2020.58
month: '08'
oa: 1
oa_version: Published Version
publication: 8th Annual European Symposium on Algorithms
publication_identifier:
isbn:
- '9783959771627'
issn:
- 1868-8969
publication_status: published
publisher: Schloss Dagstuhl - Leibniz-Zentrum für Informatik
quality_controlled: '1'
scopus_import: '1'
status: public
title: Dynamic matching algorithms in practice
type: conference
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 173
year: '2020'
...
---
_id: '11818'
abstract:
- lang: eng
text: "With input sizes becoming massive, coresets - small yet representative summary
of the input - are relevant more than ever. A weighted set C_w that is a subset
of the input is an ε-coreset if the cost of any feasible solution S with respect
to C_w is within [1±ε] of the cost of S with respect to the original input. We
give a very general technique to compute coresets in the fully-dynamic setting
where input points can be added or deleted. Given a static (i.e., not dynamic)
ε-coreset-construction algorithm that runs in time t(n, ε, λ) and computes a coreset
of size s(n, ε, λ), where n is the number of input points and 1-λ is the success
probability, we give a fully-dynamic algorithm that computes an ε-coreset with
worst-case update time O((log n) ⋅ t(s(n, ε/log n, λ/n), ε/log n, λ/n)) (this
bound is stated informally), where the success probability is 1-λ. Our technique
is a fully-dynamic analog of the merge-and-reduce technique, which is due to Har-Peled
and Mazumdar [Har-Peled and Mazumdar, 2004] and is based on a technique of Bentley
and Saxe [Jon Louis Bentley and James B. Saxe, 1980], that applies to the insertion-only
setting where points can only be added. Although, our space usage is O(n), our
technique works in the presence of an adaptive adversary, and we show that Ω(n)
space is required when adversary is adaptive.\r\nAs a concrete implication of
our technique, using the result of Braverman et al. [{Braverman} et al., 2016],
we get fully-dynamic ε-coreset-construction algorithms for k-median and k-means
with worst-case update time O(ε^{-2} k² log⁵ n log³ k) and coreset size O(ε^{-2}
k log n log² k) ignoring log log n and log(1/ε) factors and assuming that ε =
Ω(1/poly(n)) and λ = Ω(1/poly(n)) (which are very weak assumptions made only to
make these bounds easy to parse). This results in the first fully-dynamic constant-approximation
algorithms for k-median and k-means with update times O(poly(k, log n, ε^{-1})).
Specifically, the dependence on k is only quadratic, and the bounds are worst-case.
The best previous bound for both problems was amortized O(nlog n) by Cohen-Addad
et al. [Cohen-Addad et al., 2019] via randomized O(1)-coresets in O(n) space.\r\nWe
also show that under the OMv conjecture [Monika Henzinger et al., 2015], a fully-dynamic
(4 - δ)-approximation algorithm for k-means must either have an amortized update
time of Ω(k^{1-γ}) or amortized query time of Ω(k^{2 - γ}), where γ > 0 is a constant."
alternative_title:
- LIPIcs
article_number: '57'
article_processing_charge: No
arxiv: 1
author:
- first_name: Monika H
full_name: Henzinger, Monika H
id: 540c9bbd-f2de-11ec-812d-d04a5be85630
last_name: Henzinger
orcid: 0000-0002-5008-6530
- first_name: Sagar
full_name: Kale, Sagar
last_name: Kale
citation:
ama: 'Henzinger MH, Kale S. Fully-dynamic coresets. In: 28th Annual European
Symposium on Algorithms. Vol 173. Schloss Dagstuhl - Leibniz-Zentrum für Informatik;
2020. doi:10.4230/LIPIcs.ESA.2020.57'
apa: 'Henzinger, M. H., & Kale, S. (2020). Fully-dynamic coresets. In 28th
Annual European Symposium on Algorithms (Vol. 173). Pisa, Italy: Schloss Dagstuhl
- Leibniz-Zentrum für Informatik. https://doi.org/10.4230/LIPIcs.ESA.2020.57'
chicago: Henzinger, Monika H, and Sagar Kale. “Fully-Dynamic Coresets.” In 28th
Annual European Symposium on Algorithms, Vol. 173. Schloss Dagstuhl - Leibniz-Zentrum
für Informatik, 2020. https://doi.org/10.4230/LIPIcs.ESA.2020.57.
ieee: M. H. Henzinger and S. Kale, “Fully-dynamic coresets,” in 28th Annual European
Symposium on Algorithms, Pisa, Italy, 2020, vol. 173.
ista: 'Henzinger MH, Kale S. 2020. Fully-dynamic coresets. 28th Annual European
Symposium on Algorithms. ESA: Annual European Symposium on Algorithms, LIPIcs,
vol. 173, 57.'
mla: Henzinger, Monika H., and Sagar Kale. “Fully-Dynamic Coresets.” 28th Annual
European Symposium on Algorithms, vol. 173, 57, Schloss Dagstuhl - Leibniz-Zentrum
für Informatik, 2020, doi:10.4230/LIPIcs.ESA.2020.57.
short: M.H. Henzinger, S. Kale, in:, 28th Annual European Symposium on Algorithms,
Schloss Dagstuhl - Leibniz-Zentrum für Informatik, 2020.
conference:
end_date: 2020-09-09
location: Pisa, Italy
name: 'ESA: Annual European Symposium on Algorithms'
start_date: 2020-09-07
date_created: 2022-08-12T07:22:55Z
date_published: 2020-08-26T00:00:00Z
date_updated: 2023-02-14T09:29:51Z
day: '26'
doi: 10.4230/LIPIcs.ESA.2020.57
extern: '1'
external_id:
arxiv:
- '2004.14891'
intvolume: ' 173'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://doi.org/10.4230/LIPIcs.ESA.2020.57
month: '08'
oa: 1
oa_version: Published Version
publication: 28th Annual European Symposium on Algorithms
publication_identifier:
isbn:
- '9783959771627'
issn:
- 1868-8969
publication_status: published
publisher: Schloss Dagstuhl - Leibniz-Zentrum für Informatik
quality_controlled: '1'
scopus_import: '1'
status: public
title: Fully-dynamic coresets
type: conference
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 173
year: '2020'
...
---
_id: '11819'
abstract:
- lang: eng
text: We present a practically efficient algorithm that finds all global minimum
cuts in huge undirected graphs. Our algorithm uses a multitude of kernelization
rules to reduce the graph to a small equivalent instance and then finds all minimum
cuts using an optimized version of the algorithm of Nagamochi, Nakao and Ibaraki.
In shared memory we are able to find all minimum cuts of graphs with up to billions
of edges and millions of minimum cuts in a few minutes. We also give a new linear
time algorithm to find the most balanced minimum cuts given as input the representation
of all minimum cuts.
alternative_title:
- LIPIcs
article_number: '59'
article_processing_charge: No
arxiv: 1
author:
- first_name: Monika H
full_name: Henzinger, Monika H
id: 540c9bbd-f2de-11ec-812d-d04a5be85630
last_name: Henzinger
orcid: 0000-0002-5008-6530
- first_name: Alexander
full_name: Noe, Alexander
last_name: Noe
- first_name: Christian
full_name: Schulz, Christian
last_name: Schulz
- first_name: Darren
full_name: Strash, Darren
last_name: Strash
citation:
ama: 'Henzinger MH, Noe A, Schulz C, Strash D. Finding all global minimum cuts in
practice. In: 28th Annual European Symposium on Algorithms. Vol 173. Schloss
Dagstuhl - Leibniz-Zentrum für Informatik; 2020. doi:10.4230/LIPIcs.ESA.2020.59'
apa: 'Henzinger, M. H., Noe, A., Schulz, C., & Strash, D. (2020). Finding all
global minimum cuts in practice. In 28th Annual European Symposium on Algorithms
(Vol. 173). Pisa, Italy: Schloss Dagstuhl - Leibniz-Zentrum für Informatik. https://doi.org/10.4230/LIPIcs.ESA.2020.59'
chicago: Henzinger, Monika H, Alexander Noe, Christian Schulz, and Darren Strash.
“Finding All Global Minimum Cuts in Practice.” In 28th Annual European Symposium
on Algorithms, Vol. 173. Schloss Dagstuhl - Leibniz-Zentrum für Informatik,
2020. https://doi.org/10.4230/LIPIcs.ESA.2020.59.
ieee: M. H. Henzinger, A. Noe, C. Schulz, and D. Strash, “Finding all global minimum
cuts in practice,” in 28th Annual European Symposium on Algorithms, Pisa,
Italy, 2020, vol. 173.
ista: 'Henzinger MH, Noe A, Schulz C, Strash D. 2020. Finding all global minimum
cuts in practice. 28th Annual European Symposium on Algorithms. ESA: Annual European
Symposium on Algorithms, LIPIcs, vol. 173, 59.'
mla: Henzinger, Monika H., et al. “Finding All Global Minimum Cuts in Practice.”
28th Annual European Symposium on Algorithms, vol. 173, 59, Schloss Dagstuhl
- Leibniz-Zentrum für Informatik, 2020, doi:10.4230/LIPIcs.ESA.2020.59.
short: M.H. Henzinger, A. Noe, C. Schulz, D. Strash, in:, 28th Annual European Symposium
on Algorithms, Schloss Dagstuhl - Leibniz-Zentrum für Informatik, 2020.
conference:
end_date: 2020-09-09
location: Pisa, Italy
name: 'ESA: Annual European Symposium on Algorithms'
start_date: 2020-09-07
date_created: 2022-08-12T07:27:42Z
date_published: 2020-08-26T00:00:00Z
date_updated: 2023-02-14T09:39:18Z
day: '26'
doi: 10.4230/LIPIcs.ESA.2020.59
extern: '1'
external_id:
arxiv:
- '2002.06948'
intvolume: ' 173'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://doi.org/10.4230/LIPIcs.ESA.2020.59
month: '08'
oa: 1
oa_version: Published Version
publication: 28th Annual European Symposium on Algorithms
publication_identifier:
isbn:
- '9783959771627'
issn:
- 1868-8969
publication_status: published
publisher: Schloss Dagstuhl - Leibniz-Zentrum für Informatik
quality_controlled: '1'
scopus_import: '1'
status: public
title: Finding all global minimum cuts in practice
type: conference
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 173
year: '2020'
...
---
_id: '11822'
abstract:
- lang: eng
text: "The fully dynamic transitive closure problem asks to maintain reachability
information in a directed graph between arbitrary pairs of vertices, while the
graph undergoes a sequence of edge insertions and deletions. The problem has been
thoroughly investigated in theory and many specialized algorithms for solving
it have been proposed in the last decades. In two large studies [Frigioni ea,
2001; Krommidas and Zaroliagis, 2008], a number of these algorithms have been
evaluated experimentally against simple, static algorithms for graph traversal,
showing the competitiveness and even superiority of the simple algorithms in practice,
except for very dense random graphs or very high ratios of queries. A major drawback
of those studies is that only small and mostly randomly generated graphs are considered.\r\nIn
this paper, we engineer new algorithms to maintain all-pairs reachability information
which are simple and space-efficient. Moreover, we perform an extensive experimental
evaluation on both generated and real-world instances that are several orders
of magnitude larger than those in the previous studies. Our results indicate that
our new algorithms outperform all state-of-the-art algorithms on all types of
input considerably in practice."
alternative_title:
- LIPIcs
article_number: '14'
article_processing_charge: No
arxiv: 1
author:
- first_name: Kathrin
full_name: Hanauer, Kathrin
last_name: Hanauer
- first_name: Monika H
full_name: Henzinger, Monika H
id: 540c9bbd-f2de-11ec-812d-d04a5be85630
last_name: Henzinger
orcid: 0000-0002-5008-6530
- first_name: Christian
full_name: Schulz, Christian
last_name: Schulz
citation:
ama: 'Hanauer K, Henzinger MH, Schulz C. Faster fully dynamic transitive closure
in practice. In: 18th International Symposium on Experimental Algorithms.
Vol 160. Schloss Dagstuhl - Leibniz-Zentrum für Informatik; 2020. doi:10.4230/LIPIcs.SEA.2020.14'
apa: 'Hanauer, K., Henzinger, M. H., & Schulz, C. (2020). Faster fully dynamic
transitive closure in practice. In 18th International Symposium on Experimental
Algorithms (Vol. 160). Pisa, Italy: Schloss Dagstuhl - Leibniz-Zentrum für
Informatik. https://doi.org/10.4230/LIPIcs.SEA.2020.14'
chicago: Hanauer, Kathrin, Monika H Henzinger, and Christian Schulz. “Faster Fully
Dynamic Transitive Closure in Practice.” In 18th International Symposium on
Experimental Algorithms, Vol. 160. Schloss Dagstuhl - Leibniz-Zentrum für
Informatik, 2020. https://doi.org/10.4230/LIPIcs.SEA.2020.14.
ieee: K. Hanauer, M. H. Henzinger, and C. Schulz, “Faster fully dynamic transitive
closure in practice,” in 18th International Symposium on Experimental Algorithms,
Pisa, Italy, 2020, vol. 160.
ista: 'Hanauer K, Henzinger MH, Schulz C. 2020. Faster fully dynamic transitive
closure in practice. 18th International Symposium on Experimental Algorithms.
SEA: Symposium on Experimental Algorithms, LIPIcs, vol. 160, 14.'
mla: Hanauer, Kathrin, et al. “Faster Fully Dynamic Transitive Closure in Practice.”
18th International Symposium on Experimental Algorithms, vol. 160, 14,
Schloss Dagstuhl - Leibniz-Zentrum für Informatik, 2020, doi:10.4230/LIPIcs.SEA.2020.14.
short: K. Hanauer, M.H. Henzinger, C. Schulz, in:, 18th International Symposium
on Experimental Algorithms, Schloss Dagstuhl - Leibniz-Zentrum für Informatik,
2020.
conference:
end_date: 2020-09-09
location: Pisa, Italy
name: 'SEA: Symposium on Experimental Algorithms'
start_date: 2020-09-07
date_created: 2022-08-12T07:32:53Z
date_published: 2020-06-12T00:00:00Z
date_updated: 2023-02-14T09:58:42Z
day: '12'
doi: 10.4230/LIPIcs.SEA.2020.14
extern: '1'
external_id:
arxiv:
- '2002.00813'
intvolume: ' 160'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://doi.org/10.4230/LIPIcs.SEA.2020.14
month: '06'
oa: 1
oa_version: Published Version
publication: 18th International Symposium on Experimental Algorithms
publication_identifier:
isbn:
- '9783959771481'
issn:
- 1868-8969
publication_status: published
publisher: Schloss Dagstuhl - Leibniz-Zentrum für Informatik
quality_controlled: '1'
scopus_import: '1'
status: public
title: Faster fully dynamic transitive closure in practice
type: conference
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 160
year: '2020'
...
---
_id: '11824'
abstract:
- lang: eng
text: "Independent set is a fundamental problem in combinatorial optimization. While
in general graphs the problem is essentially inapproximable, for many important
graph classes there are approximation algorithms known in the offline setting.
These graph classes include interval graphs and geometric intersection graphs,
where vertices correspond to intervals/geometric objects and an edge indicates
that the two corresponding objects intersect.\r\nWe present dynamic approximation
algorithms for independent set of intervals, hypercubes and hyperrectangles in
d dimensions. They work in the fully dynamic model where each update inserts or
deletes a geometric object. All our algorithms are deterministic and have worst-case
update times that are polylogarithmic for constant d and ε>0, assuming that the
coordinates of all input objects are in [0, N]^d and each of their edges has length
at least 1. We obtain the following results:\r\n- For weighted intervals, we maintain
a (1+ε)-approximate solution.\r\n- For d-dimensional hypercubes we maintain a
(1+ε)2^d-approximate solution in the unweighted case and a O(2^d)-approximate
solution in the weighted case. Also, we show that for maintaining an unweighted
(1+ε)-approximate solution one needs polynomial update time for d ≥ 2 if the ETH
holds.\r\n- For weighted d-dimensional hyperrectangles we present a dynamic algorithm
with approximation ratio (1+ε)log^{d-1}N."
alternative_title:
- LIPIcs
article_number: '51'
article_processing_charge: No
arxiv: 1
author:
- first_name: Monika H
full_name: Henzinger, Monika H
id: 540c9bbd-f2de-11ec-812d-d04a5be85630
last_name: Henzinger
orcid: 0000-0002-5008-6530
- first_name: Stefan
full_name: Neumann, Stefan
last_name: Neumann
- first_name: Andreas
full_name: Wiese, Andreas
last_name: Wiese
citation:
ama: 'Henzinger MH, Neumann S, Wiese A. Dynamic approximate maximum independent
set of intervals, hypercubes and hyperrectangles. In: 36th International Symposium
on Computational Geometry. Vol 164. Schloss Dagstuhl - Leibniz-Zentrum für
Informatik; 2020. doi:10.4230/LIPIcs.SoCG.2020.51'
apa: 'Henzinger, M. H., Neumann, S., & Wiese, A. (2020). Dynamic approximate
maximum independent set of intervals, hypercubes and hyperrectangles. In 36th
International Symposium on Computational Geometry (Vol. 164). Zurich, Switzerland:
Schloss Dagstuhl - Leibniz-Zentrum für Informatik. https://doi.org/10.4230/LIPIcs.SoCG.2020.51'
chicago: Henzinger, Monika H, Stefan Neumann, and Andreas Wiese. “Dynamic Approximate
Maximum Independent Set of Intervals, Hypercubes and Hyperrectangles.” In 36th
International Symposium on Computational Geometry, Vol. 164. Schloss Dagstuhl
- Leibniz-Zentrum für Informatik, 2020. https://doi.org/10.4230/LIPIcs.SoCG.2020.51.
ieee: M. H. Henzinger, S. Neumann, and A. Wiese, “Dynamic approximate maximum independent
set of intervals, hypercubes and hyperrectangles,” in 36th International Symposium
on Computational Geometry, Zurich, Switzerland, 2020, vol. 164.
ista: 'Henzinger MH, Neumann S, Wiese A. 2020. Dynamic approximate maximum independent
set of intervals, hypercubes and hyperrectangles. 36th International Symposium
on Computational Geometry. SoCG: Symposium on Computational Geometry, LIPIcs,
vol. 164, 51.'
mla: Henzinger, Monika H., et al. “Dynamic Approximate Maximum Independent Set of
Intervals, Hypercubes and Hyperrectangles.” 36th International Symposium on
Computational Geometry, vol. 164, 51, Schloss Dagstuhl - Leibniz-Zentrum für
Informatik, 2020, doi:10.4230/LIPIcs.SoCG.2020.51.
short: M.H. Henzinger, S. Neumann, A. Wiese, in:, 36th International Symposium on
Computational Geometry, Schloss Dagstuhl - Leibniz-Zentrum für Informatik, 2020.
conference:
end_date: 2020-06-26
location: Zurich, Switzerland
name: 'SoCG: Symposium on Computational Geometry'
start_date: 2020-06-23
date_created: 2022-08-12T07:46:44Z
date_published: 2020-06-08T00:00:00Z
date_updated: 2023-02-14T10:00:58Z
day: '08'
doi: 10.4230/LIPIcs.SoCG.2020.51
extern: '1'
external_id:
arxiv:
- '2003.02605'
intvolume: ' 164'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://doi.org/10.4230/LIPIcs.SoCG.2020.51
month: '06'
oa: 1
oa_version: Published Version
publication: 36th International Symposium on Computational Geometry
publication_identifier:
isbn:
- '9783959771436'
issn:
- 1868-8969
publication_status: published
publisher: Schloss Dagstuhl - Leibniz-Zentrum für Informatik
quality_controlled: '1'
scopus_import: '1'
status: public
title: Dynamic approximate maximum independent set of intervals, hypercubes and hyperrectangles
type: conference
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 164
year: '2020'
...
---
_id: '11825'
abstract:
- lang: eng
text: We give a fully dynamic (Las-Vegas style) algorithm with constant expected
amortized time per update that maintains a proper (Δ+1)-vertex coloring of a graph
with maximum degree at most Δ. This improves upon the previous O(log Δ)-time algorithm
by Bhattacharya et al. (SODA 2018). Our algorithm uses an approach based on assigning
random ranks to vertices and does not need to maintain a hierarchical graph decomposition.
We show that our result does not only have optimal running time, but is also optimal
in the sense that already deciding whether a Δ-coloring exists in a dynamically
changing graph with maximum degree at most Δ takes Ω(log n) time per operation.
alternative_title:
- LIPIcs
article_number: '53'
article_processing_charge: No
arxiv: 1
author:
- first_name: Monika H
full_name: Henzinger, Monika H
id: 540c9bbd-f2de-11ec-812d-d04a5be85630
last_name: Henzinger
orcid: 0000-0002-5008-6530
- first_name: Pan
full_name: Peng, Pan
last_name: Peng
citation:
ama: 'Henzinger MH, Peng P. Constant-time dynamic (Δ+1)-coloring. In: 37th International
Symposium on Theoretical Aspects of Computer Science. Vol 154. Schloss Dagstuhl
- Leibniz-Zentrum für Informatik; 2020. doi:10.4230/LIPIcs.STACS.2020.53'
apa: 'Henzinger, M. H., & Peng, P. (2020). Constant-time dynamic (Δ+1)-coloring.
In 37th International Symposium on Theoretical Aspects of Computer Science
(Vol. 154). Montpellier, France: Schloss Dagstuhl - Leibniz-Zentrum für Informatik.
https://doi.org/10.4230/LIPIcs.STACS.2020.53'
chicago: Henzinger, Monika H, and Pan Peng. “Constant-Time Dynamic (Δ+1)-Coloring.”
In 37th International Symposium on Theoretical Aspects of Computer Science,
Vol. 154. Schloss Dagstuhl - Leibniz-Zentrum für Informatik, 2020. https://doi.org/10.4230/LIPIcs.STACS.2020.53.
ieee: M. H. Henzinger and P. Peng, “Constant-time dynamic (Δ+1)-coloring,” in 37th
International Symposium on Theoretical Aspects of Computer Science, Montpellier,
France, 2020, vol. 154.
ista: 'Henzinger MH, Peng P. 2020. Constant-time dynamic (Δ+1)-coloring. 37th International
Symposium on Theoretical Aspects of Computer Science. STACS: Symposium on Theoretical
Aspects of Computer Science, LIPIcs, vol. 154, 53.'
mla: Henzinger, Monika H., and Pan Peng. “Constant-Time Dynamic (Δ+1)-Coloring.”
37th International Symposium on Theoretical Aspects of Computer Science,
vol. 154, 53, Schloss Dagstuhl - Leibniz-Zentrum für Informatik, 2020, doi:10.4230/LIPIcs.STACS.2020.53.
short: M.H. Henzinger, P. Peng, in:, 37th International Symposium on Theoretical
Aspects of Computer Science, Schloss Dagstuhl - Leibniz-Zentrum für Informatik,
2020.
conference:
end_date: 2020-03-13
location: Montpellier, France
name: 'STACS: Symposium on Theoretical Aspects of Computer Science'
start_date: 2020-03-10
date_created: 2022-08-12T07:53:05Z
date_published: 2020-03-04T00:00:00Z
date_updated: 2023-02-14T10:03:43Z
day: '04'
doi: 10.4230/LIPIcs.STACS.2020.53
extern: '1'
external_id:
arxiv:
- '1907.04745'
intvolume: ' 154'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://doi.org/10.4230/LIPIcs.STACS.2020.53
month: '03'
oa: 1
oa_version: Published Version
publication: 37th International Symposium on Theoretical Aspects of Computer Science
publication_identifier:
isbn:
- '9783959771405'
issn:
- 1868-8969
publication_status: published
publisher: Schloss Dagstuhl - Leibniz-Zentrum für Informatik
quality_controlled: '1'
scopus_import: '1'
status: public
title: Constant-time dynamic (Δ+1)-coloring
type: conference
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 154
year: '2020'
...
---
_id: '11852'
abstract:
- lang: eng
text: We present a general framework of designing efficient dynamic approximate
algorithms for optimization problems on undirected graphs. In particular, we develop
a technique that, given any problem that admits a certain notion of vertex sparsifiers,
gives data structures that maintain approximate solutions in sub-linear update
and query time. We illustrate the applicability of our paradigm to the following
problems. (1)A fully-dynamic algorithm that approximates all-pair maximum-flows/minimum-cuts
up to a nearly logarithmic factor in O~(n2/3) 11The O~(⋅) notation is used in
this paper to hide poly-logarithmic factors. amortized time against an oblivious
adversary, and O~(m3/4) time against an adaptive adversary. (2)An incremental
data structure that maintains O(1) - approximate shortest path in no(1) time per
operation, as well as fully dynamic approximate all-pair shortest path and transshipment
in O~(n2/3+o(1)) amortized time per operation. (3)A fully-dynamic algorithm that
approximates all-pair effective resistance up to an (1+ϵ) factor in O~(n2/3+o(1)ϵ−O(1))
amortized update time per operation. The key tool behind result (1) is the dynamic
maintenance of an algorithmic construction due to Madry [FOCS' 10], which partitions
a graph into a collection of simpler graph structures (known as j-trees) and approximately
captures the cut-flow and metric structure of the graph. The O(1)-approximation
guarantee of (2) is by adapting the distance oracles by [Thorup-Zwick JACM '05].
Result (3) is obtained by invoking the random-walk based spectral vertex sparsifier
by [Durfee et al. STOC '19] in a hierarchical manner, while carefully keeping
track of the recourse among levels in the hierarchy. See https://arxiv.org/pdf/2005.02368.pdf
for the full version of this paper.
article_processing_charge: No
arxiv: 1
author:
- first_name: Li
full_name: Chen, Li
last_name: Chen
- first_name: Gramoz
full_name: Goranci, Gramoz
last_name: Goranci
- first_name: Monika H
full_name: Henzinger, Monika H
id: 540c9bbd-f2de-11ec-812d-d04a5be85630
last_name: Henzinger
orcid: 0000-0002-5008-6530
- first_name: Richard
full_name: Peng, Richard
last_name: Peng
- first_name: Thatchaphol
full_name: Saranurak, Thatchaphol
last_name: Saranurak
citation:
ama: 'Chen L, Goranci G, Henzinger MH, Peng R, Saranurak T. Fast dynamic cuts, distances
and effective resistances via vertex sparsifiers. In: 61st Annual Symposium
on Foundations of Computer Science. Institute of Electrical and Electronics
Engineers; 2020:1135-1146. doi:10.1109/focs46700.2020.00109'
apa: 'Chen, L., Goranci, G., Henzinger, M. H., Peng, R., & Saranurak, T. (2020).
Fast dynamic cuts, distances and effective resistances via vertex sparsifiers.
In 61st Annual Symposium on Foundations of Computer Science (pp. 1135–1146).
Durham, NC, United States: Institute of Electrical and Electronics Engineers.
https://doi.org/10.1109/focs46700.2020.00109'
chicago: Chen, Li, Gramoz Goranci, Monika H Henzinger, Richard Peng, and Thatchaphol
Saranurak. “Fast Dynamic Cuts, Distances and Effective Resistances via Vertex
Sparsifiers.” In 61st Annual Symposium on Foundations of Computer Science,
1135–46. Institute of Electrical and Electronics Engineers, 2020. https://doi.org/10.1109/focs46700.2020.00109.
ieee: L. Chen, G. Goranci, M. H. Henzinger, R. Peng, and T. Saranurak, “Fast dynamic
cuts, distances and effective resistances via vertex sparsifiers,” in 61st
Annual Symposium on Foundations of Computer Science, Durham, NC, United States,
2020, pp. 1135–1146.
ista: 'Chen L, Goranci G, Henzinger MH, Peng R, Saranurak T. 2020. Fast dynamic
cuts, distances and effective resistances via vertex sparsifiers. 61st Annual
Symposium on Foundations of Computer Science. FOCS: Annual Symposium on Foundations
of Computer Science, 1135–1146.'
mla: Chen, Li, et al. “Fast Dynamic Cuts, Distances and Effective Resistances via
Vertex Sparsifiers.” 61st Annual Symposium on Foundations of Computer Science,
Institute of Electrical and Electronics Engineers, 2020, pp. 1135–46, doi:10.1109/focs46700.2020.00109.
short: L. Chen, G. Goranci, M.H. Henzinger, R. Peng, T. Saranurak, in:, 61st Annual
Symposium on Foundations of Computer Science, Institute of Electrical and Electronics
Engineers, 2020, pp. 1135–1146.
conference:
end_date: 2020-11-19
location: Durham, NC, United States
name: 'FOCS: Annual Symposium on Foundations of Computer Science'
start_date: 2020-11-16
date_created: 2022-08-16T07:33:12Z
date_published: 2020-11-01T00:00:00Z
date_updated: 2023-02-17T09:47:36Z
day: '01'
doi: 10.1109/focs46700.2020.00109
extern: '1'
external_id:
arxiv:
- '2005.02368'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://arxiv.org/abs/2005.02368
month: '11'
oa: 1
oa_version: Preprint
page: 1135-1146
publication: 61st Annual Symposium on Foundations of Computer Science
publication_identifier:
eisbn:
- 978-1-7281-9621-3
eissn:
- 2575-8454
isbn:
- 978-1-7281-9622-0
publication_status: published
publisher: Institute of Electrical and Electronics Engineers
quality_controlled: '1'
scopus_import: '1'
status: public
title: Fast dynamic cuts, distances and effective resistances via vertex sparsifiers
type: conference
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
year: '2020'
...
---
_id: '11880'
abstract:
- lang: eng
text: "Given a directed graph and a source vertex, the fully dynamic single-source
reachability problem is to maintain the set of vertices that are reachable from
the given vertex, subject to edge deletions and insertions. It is one of the most
fundamental problems on graphs and appears directly or indirectly in many and
varied applications. While there has been theoretical work on this problem, showing
both linear conditional lower bounds for the fully dynamic problem and insertions-only
and deletions-only upper bounds beating these conditional lower bounds, there
has been no experimental study that compares the performance of fully dynamic
reachability algorithms in practice. Previous experimental studies in this area
concentrated only on the more general all-pairs reachability or transitive closure
problem and did not use real-world dynamic graphs.\r\n\r\nIn this paper, we bridge
this gap by empirically studying an extensive set of algorithms for the single-source
reachability problem in the fully dynamic setting. In particular, we design several
fully dynamic variants of well-known approaches to obtain and maintain reachability
information with respect to a distinguished source. Moreover, we extend the existing
insertions-only or deletions-only upper bounds into fully dynamic algorithms.
Even though the worst-case time per operation of all the fully dynamic algorithms
we evaluate is at least linear in the number of edges in the graph (as is to be
expected given the conditional lower bounds) we show in our extensive experimental
evaluation that their performance differs greatly, both on generated as well as
on real-world instances."
article_processing_charge: No
arxiv: 1
author:
- first_name: Kathrin
full_name: Hanauer, Kathrin
last_name: Hanauer
- first_name: Monika H
full_name: Henzinger, Monika H
id: 540c9bbd-f2de-11ec-812d-d04a5be85630
last_name: Henzinger
orcid: 0000-0002-5008-6530
- first_name: Christian
full_name: Schulz, Christian
last_name: Schulz
citation:
ama: 'Hanauer K, Henzinger MH, Schulz C. Fully dynamic single-source reachability
in practice: An experimental study. In: 2020 Symposium on Algorithm Engineering
and Experiments. Society for Industrial and Applied Mathematics; 2020:106-119.
doi:10.1137/1.9781611976007.9'
apa: 'Hanauer, K., Henzinger, M. H., & Schulz, C. (2020). Fully dynamic single-source
reachability in practice: An experimental study. In 2020 Symposium on Algorithm
Engineering and Experiments (pp. 106–119). Salt Lake City, UT, United States:
Society for Industrial and Applied Mathematics. https://doi.org/10.1137/1.9781611976007.9'
chicago: 'Hanauer, Kathrin, Monika H Henzinger, and Christian Schulz. “Fully Dynamic
Single-Source Reachability in Practice: An Experimental Study.” In 2020 Symposium
on Algorithm Engineering and Experiments, 106–19. Society for Industrial and
Applied Mathematics, 2020. https://doi.org/10.1137/1.9781611976007.9.'
ieee: 'K. Hanauer, M. H. Henzinger, and C. Schulz, “Fully dynamic single-source
reachability in practice: An experimental study,” in 2020 Symposium on Algorithm
Engineering and Experiments, Salt Lake City, UT, United States, 2020, pp.
106–119.'
ista: 'Hanauer K, Henzinger MH, Schulz C. 2020. Fully dynamic single-source reachability
in practice: An experimental study. 2020 Symposium on Algorithm Engineering and
Experiments. ALENEX: Symposium on Algorithm Engineering and Experiments, 106–119.'
mla: 'Hanauer, Kathrin, et al. “Fully Dynamic Single-Source Reachability in Practice:
An Experimental Study.” 2020 Symposium on Algorithm Engineering and Experiments,
Society for Industrial and Applied Mathematics, 2020, pp. 106–19, doi:10.1137/1.9781611976007.9.'
short: K. Hanauer, M.H. Henzinger, C. Schulz, in:, 2020 Symposium on Algorithm Engineering
and Experiments, Society for Industrial and Applied Mathematics, 2020, pp. 106–119.
conference:
end_date: 2020-01-06
location: Salt Lake City, UT, United States
name: 'ALENEX: Symposium on Algorithm Engineering and Experiments'
start_date: 2020-01-05
date_created: 2022-08-17T06:39:32Z
date_published: 2020-01-01T00:00:00Z
date_updated: 2023-02-17T14:00:37Z
day: '01'
doi: 10.1137/1.9781611976007.9
extern: '1'
external_id:
arxiv:
- '1905.01216'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://arxiv.org/abs/1905.01216
month: '01'
oa: 1
oa_version: Preprint
page: 106-119
publication: 2020 Symposium on Algorithm Engineering and Experiments
publication_identifier:
eisbn:
- 978-1-61197-600-7
publication_status: published
publisher: Society for Industrial and Applied Mathematics
quality_controlled: '1'
scopus_import: '1'
status: public
title: 'Fully dynamic single-source reachability in practice: An experimental study'
type: conference
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
year: '2020'
...
---
_id: '11881'
abstract:
- lang: eng
text: We introduce the fastest known exact algorithm for the multiterminal cut problem
with k terminals. In particular, we engineer existing as well as new data reduction
rules. We use the rules within a branch-and-reduce framework and to boost the
performance of an ILP formulation. Our algorithms achieve improvements in running
time of up to multiple orders of magnitudes over the ILP formulation without data
reductions, which has been the de facto standard used by practitioners. This allows
us to solve instances to optimality that are significantly larger than was previously
possible.
article_processing_charge: No
arxiv: 1
author:
- first_name: Monika H
full_name: Henzinger, Monika H
id: 540c9bbd-f2de-11ec-812d-d04a5be85630
last_name: Henzinger
orcid: 0000-0002-5008-6530
- first_name: Alexander
full_name: Noe, Alexander
last_name: Noe
- first_name: Christian
full_name: Schulz, Christian
last_name: Schulz
citation:
ama: 'Henzinger MH, Noe A, Schulz C. Shared-memory branch-and-reduce for multiterminal
cuts. In: 2020 Symposium on Algorithm Engineering and Experiments. Society
for Industrial and Applied Mathematics; 2020:42-55. doi:10.1137/1.9781611976007.4'
apa: 'Henzinger, M. H., Noe, A., & Schulz, C. (2020). Shared-memory branch-and-reduce
for multiterminal cuts. In 2020 Symposium on Algorithm Engineering and Experiments
(pp. 42–55). Salt Lake City, UT, United States: Society for Industrial and Applied
Mathematics. https://doi.org/10.1137/1.9781611976007.4'
chicago: Henzinger, Monika H, Alexander Noe, and Christian Schulz. “Shared-Memory
Branch-and-Reduce for Multiterminal Cuts.” In 2020 Symposium on Algorithm Engineering
and Experiments, 42–55. Society for Industrial and Applied Mathematics, 2020.
https://doi.org/10.1137/1.9781611976007.4.
ieee: M. H. Henzinger, A. Noe, and C. Schulz, “Shared-memory branch-and-reduce for
multiterminal cuts,” in 2020 Symposium on Algorithm Engineering and Experiments,
Salt Lake City, UT, United States, 2020, pp. 42–55.
ista: 'Henzinger MH, Noe A, Schulz C. 2020. Shared-memory branch-and-reduce for
multiterminal cuts. 2020 Symposium on Algorithm Engineering and Experiments. ALENEX:
Symposium on Algorithm Engineering and Experiments, 42–55.'
mla: Henzinger, Monika H., et al. “Shared-Memory Branch-and-Reduce for Multiterminal
Cuts.” 2020 Symposium on Algorithm Engineering and Experiments, Society
for Industrial and Applied Mathematics, 2020, pp. 42–55, doi:10.1137/1.9781611976007.4.
short: M.H. Henzinger, A. Noe, C. Schulz, in:, 2020 Symposium on Algorithm Engineering
and Experiments, Society for Industrial and Applied Mathematics, 2020, pp. 42–55.
conference:
end_date: 2020-01-06
location: Salt Lake City, UT, United States
name: 'ALENEX: Symposium on Algorithm Engineering and Experiments'
start_date: 2020-01-05
date_created: 2022-08-17T06:47:40Z
date_published: 2020-01-01T00:00:00Z
date_updated: 2023-02-17T14:02:04Z
day: '01'
doi: 10.1137/1.9781611976007.4
extern: '1'
external_id:
arxiv:
- '1908.04141'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://arxiv.org/abs/1908.04141
month: '01'
oa: 1
oa_version: Preprint
page: 42-55
publication: 2020 Symposium on Algorithm Engineering and Experiments
publication_identifier:
eisbn:
- 978-1-61197-600-7
publication_status: published
publisher: Society for Industrial and Applied Mathematics
quality_controlled: '1'
scopus_import: '1'
status: public
title: Shared-memory branch-and-reduce for multiterminal cuts
type: conference
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
year: '2020'
...
---
_id: '11894'
abstract:
- lang: eng
text: "Graph sparsification aims at compressing large graphs into smaller ones while
preserving important characteristics of the input graph. In this work we study
vertex sparsifiers, i.e., sparsifiers whose goal is to reduce the number of vertices.
We focus on the following notions: (1) Given a digraph \U0001D43A=(\U0001D449,\U0001D438)
and terminal vertices \U0001D43E⊂\U0001D449 with |\U0001D43E|=\U0001D458, a (vertex)
reachability sparsifier of \U0001D43A is a digraph \U0001D43B=(\U0001D449\U0001D43B,\U0001D438\U0001D43B),
\U0001D43E⊂\U0001D449\U0001D43B that preserves all reachability information among
terminal pairs. Let |\U0001D449\U0001D43B| denote the size of \U0001D43B. In this
work we introduce the notion of reachability-preserving minors (RPMs), i.e., we
require \U0001D43B to be a minor of \U0001D43A. We show any directed graph \U0001D43A
admits an RPM \U0001D43B of size \U0001D442(\U0001D4583), and if \U0001D43A is
planar, then the size of \U0001D43B improves to \U0001D442(\U0001D4582log\U0001D458).
We complement our upper bound by showing that there exists an infinite family
of grids such that any RPM must have Ω(\U0001D4582) vertices. (2) Given a weighted
undirected graph \U0001D43A=(\U0001D449,\U0001D438) and terminal vertices \U0001D43E
with |\U0001D43E|=\U0001D458, an exact (vertex) cut sparsifier of \U0001D43A is
a graph \U0001D43B with \U0001D43E⊂\U0001D449\U0001D43B that preserves the value
of minimum cuts separating any bipartition of \U0001D43E. We show that planar
graphs with all the \U0001D458 terminals lying on the same face admit exact cut
sparsifiers of size \U0001D442(\U0001D4582) that are also planar. Our result extends
to flow and distance sparsifiers. It improves the previous best-known bound of
\U0001D442(\U0001D458222\U0001D458) for cut and flow sparsifiers by an exponential
factor and matches an Ω(\U0001D4582) lower-bound for this class of graphs."
article_processing_charge: No
article_type: original
arxiv: 1
author:
- first_name: Gramoz
full_name: Goranci, Gramoz
last_name: Goranci
- first_name: Monika H
full_name: Henzinger, Monika H
id: 540c9bbd-f2de-11ec-812d-d04a5be85630
last_name: Henzinger
orcid: 0000-0002-5008-6530
- first_name: Pan
full_name: Peng, Pan
last_name: Peng
citation:
ama: Goranci G, Henzinger MH, Peng P. Improved guarantees for vertex sparsification
in planar graphs. SIAM Journal on Discrete Mathematics. 2020;34(1):130-162.
doi:10.1137/17m1163153
apa: Goranci, G., Henzinger, M. H., & Peng, P. (2020). Improved guarantees for
vertex sparsification in planar graphs. SIAM Journal on Discrete Mathematics.
Society for Industrial & Applied Mathematics. https://doi.org/10.1137/17m1163153
chicago: Goranci, Gramoz, Monika H Henzinger, and Pan Peng. “Improved Guarantees
for Vertex Sparsification in Planar Graphs.” SIAM Journal on Discrete Mathematics.
Society for Industrial & Applied Mathematics, 2020. https://doi.org/10.1137/17m1163153.
ieee: G. Goranci, M. H. Henzinger, and P. Peng, “Improved guarantees for vertex
sparsification in planar graphs,” SIAM Journal on Discrete Mathematics,
vol. 34, no. 1. Society for Industrial & Applied Mathematics, pp. 130–162,
2020.
ista: Goranci G, Henzinger MH, Peng P. 2020. Improved guarantees for vertex sparsification
in planar graphs. SIAM Journal on Discrete Mathematics. 34(1), 130–162.
mla: Goranci, Gramoz, et al. “Improved Guarantees for Vertex Sparsification in Planar
Graphs.” SIAM Journal on Discrete Mathematics, vol. 34, no. 1, Society
for Industrial & Applied Mathematics, 2020, pp. 130–62, doi:10.1137/17m1163153.
short: G. Goranci, M.H. Henzinger, P. Peng, SIAM Journal on Discrete Mathematics
34 (2020) 130–162.
date_created: 2022-08-17T08:50:24Z
date_published: 2020-01-01T00:00:00Z
date_updated: 2023-02-21T16:29:44Z
day: '01'
doi: 10.1137/17m1163153
extern: '1'
external_id:
arxiv:
- '1702.01136'
intvolume: ' 34'
issue: '1'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://arxiv.org/abs/1702.01136
month: '01'
oa: 1
oa_version: Preprint
page: 130-162
publication: SIAM Journal on Discrete Mathematics
publication_identifier:
eissn:
- 1095-7146
issn:
- 0895-4801
publication_status: published
publisher: Society for Industrial & Applied Mathematics
quality_controlled: '1'
related_material:
record:
- id: '11831'
relation: earlier_version
status: public
scopus_import: '1'
status: public
title: Improved guarantees for vertex sparsification in planar graphs
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 34
year: '2020'
...
---
_id: '11954'
abstract:
- lang: eng
text: The combination of nickel and photocatalysis has unlocked a variety of cross-couplings.
These protocols rely on a few photocatalysts that can only convert a small portion
of visible light (<500 nm) into chemical energy. The high-energy photons that
excite the photocatalyst can result in unwanted side reactions. Dyes that absorb
a much broader spectrum of light are not applicable because of their short-lived
singlet excited states. Here, we describe a self-assembling catalyst system that
overcomes this limitation. Immobilization of a nickel catalyst on dye-sensitized
titanium dioxide results in a material that catalyzes carbon–heteroatom and carbon–carbon
bond formations. The modular approach of dye-sensitized metallaphotocatalysts
accesses the entire visible light spectrum and allows tackling selectivity issues
resulting from low wavelengths strategically. The concept overcomes current limitations
of metallaphotocatalysis by unlocking the potential of dyes that were previously
unsuitable.
article_processing_charge: No
article_type: original
author:
- first_name: Susanne
full_name: Reischauer, Susanne
last_name: Reischauer
- first_name: Volker
full_name: Strauss, Volker
last_name: Strauss
- first_name: Bartholomäus
full_name: Pieber, Bartholomäus
id: 93e5e5b2-0da6-11ed-8a41-af589a024726
last_name: Pieber
orcid: 0000-0001-8689-388X
citation:
ama: Reischauer S, Strauss V, Pieber B. Modular, self-assembling metallaphotocatalyst
for cross-couplings using the full visible-light spectrum. ACS Catalysis.
2020;10(22):13269–13274. doi:10.1021/acscatal.0c03950
apa: Reischauer, S., Strauss, V., & Pieber, B. (2020). Modular, self-assembling
metallaphotocatalyst for cross-couplings using the full visible-light spectrum.
ACS Catalysis. American Chemical Society. https://doi.org/10.1021/acscatal.0c03950
chicago: Reischauer, Susanne, Volker Strauss, and Bartholomäus Pieber. “Modular,
Self-Assembling Metallaphotocatalyst for Cross-Couplings Using the Full Visible-Light
Spectrum.” ACS Catalysis. American Chemical Society, 2020. https://doi.org/10.1021/acscatal.0c03950.
ieee: S. Reischauer, V. Strauss, and B. Pieber, “Modular, self-assembling metallaphotocatalyst
for cross-couplings using the full visible-light spectrum,” ACS Catalysis,
vol. 10, no. 22. American Chemical Society, pp. 13269–13274, 2020.
ista: Reischauer S, Strauss V, Pieber B. 2020. Modular, self-assembling metallaphotocatalyst
for cross-couplings using the full visible-light spectrum. ACS Catalysis. 10(22),
13269–13274.
mla: Reischauer, Susanne, et al. “Modular, Self-Assembling Metallaphotocatalyst
for Cross-Couplings Using the Full Visible-Light Spectrum.” ACS Catalysis,
vol. 10, no. 22, American Chemical Society, 2020, pp. 13269–13274, doi:10.1021/acscatal.0c03950.
short: S. Reischauer, V. Strauss, B. Pieber, ACS Catalysis 10 (2020) 13269–13274.
date_created: 2022-08-24T10:40:46Z
date_published: 2020-11-02T00:00:00Z
date_updated: 2023-02-21T10:09:09Z
day: '02'
doi: 10.1021/acscatal.0c03950
extern: '1'
intvolume: ' 10'
issue: '22'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://doi.org/10.26434/chemrxiv.12444908
month: '11'
oa: 1
oa_version: Preprint
page: 13269–13274
publication: ACS Catalysis
publication_identifier:
eissn:
- 2155-5435
publication_status: published
publisher: American Chemical Society
quality_controlled: '1'
scopus_import: '1'
status: public
title: Modular, self-assembling metallaphotocatalyst for cross-couplings using the
full visible-light spectrum
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 10
year: '2020'
...
---
_id: '11969'
abstract:
- lang: eng
text: Photochemistry enables new synthetic means to form carbon–heteroatom bonds.
Photocatalysts can catalyze carbon–heteroatom cross-couplings by electron or energy
transfer either alone or in combination with a second catalyst. Photocatalyst-free
methods are possible using photolabile substrates or by generating photoactive
electron donor-acceptor complexes. This review summarizes and discusses the strategies
used in light-mediated carbon–heteroatom bond formations based on the proposed
mechanisms.
article_processing_charge: No
article_type: review
author:
- first_name: Cristian
full_name: Cavedon, Cristian
last_name: Cavedon
- first_name: Peter H.
full_name: Seeberger, Peter H.
last_name: Seeberger
- first_name: Bartholomäus
full_name: Pieber, Bartholomäus
id: 93e5e5b2-0da6-11ed-8a41-af589a024726
last_name: Pieber
orcid: 0000-0001-8689-388X
citation:
ama: Cavedon C, Seeberger PH, Pieber B. Photochemical strategies for carbon–heteroatom
bond formation. European Journal of Organic Chemistry. 2020;2020(10):1379-1392.
doi:10.1002/ejoc.201901173
apa: Cavedon, C., Seeberger, P. H., & Pieber, B. (2020). Photochemical strategies
for carbon–heteroatom bond formation. European Journal of Organic Chemistry.
Wiley. https://doi.org/10.1002/ejoc.201901173
chicago: Cavedon, Cristian, Peter H. Seeberger, and Bartholomäus Pieber. “Photochemical
Strategies for Carbon–Heteroatom Bond Formation.” European Journal of Organic
Chemistry. Wiley, 2020. https://doi.org/10.1002/ejoc.201901173.
ieee: C. Cavedon, P. H. Seeberger, and B. Pieber, “Photochemical strategies for
carbon–heteroatom bond formation,” European Journal of Organic Chemistry,
vol. 2020, no. 10. Wiley, pp. 1379–1392, 2020.
ista: Cavedon C, Seeberger PH, Pieber B. 2020. Photochemical strategies for carbon–heteroatom
bond formation. European Journal of Organic Chemistry. 2020(10), 1379–1392.
mla: Cavedon, Cristian, et al. “Photochemical Strategies for Carbon–Heteroatom Bond
Formation.” European Journal of Organic Chemistry, vol. 2020, no. 10, Wiley,
2020, pp. 1379–92, doi:10.1002/ejoc.201901173.
short: C. Cavedon, P.H. Seeberger, B. Pieber, European Journal of Organic Chemistry
2020 (2020) 1379–1392.
date_created: 2022-08-25T08:49:25Z
date_published: 2020-03-15T00:00:00Z
date_updated: 2023-02-21T10:09:47Z
day: '15'
doi: 10.1002/ejoc.201901173
extern: '1'
intvolume: ' 2020'
issue: '10'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://doi.org/10.1002/ejoc.201901173
month: '03'
oa: 1
oa_version: Published Version
page: 1379-1392
publication: European Journal of Organic Chemistry
publication_identifier:
eissn:
- 1099-0690
issn:
- 1434-193X
publication_status: published
publisher: Wiley
quality_controlled: '1'
scopus_import: '1'
status: public
title: Photochemical strategies for carbon–heteroatom bond formation
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 2020
year: '2020'
...
---
_id: '11978'
abstract:
- lang: eng
text: Dual photocatalysis and nickel catalysis can effect cross-coupling under mild
conditions, but little is known about the in situ kinetics of this class of reactions.
We report a comprehensive kinetic examination of a model carboxylate O-arylation,
comparing a state-of-the-art homogeneous photocatalyst (Ir(ppy)3) with a competitive
heterogeneous photocatalyst (graphitic carbon nitride). Experimental conditions
were adjusted such that the nickel catalytic cycle is saturated with excited photocatalyst.
This approach was designed to remove the role of the photocatalyst, by which only
the intrinsic behaviors of the nickel catalytic cycles are observed. The two reactions
did not display identical kinetics. Ir(ppy)3 deactivates the nickel catalytic
cycle and creates more dehalogenated side product. Kinetic data for the reaction
using Ir(ppy)3 supports a turnover-limiting reductive elimination. Graphitic carbon
nitride gave higher selectivity, even at high photocatalyst-to-nickel ratios.
The heterogeneous reaction also showed a rate dependence on aryl halide, indicating
that oxidative addition plays a role in rate determination. The results argue
against the current mechanistic hypothesis, which states that the photocatalyst
is only involved to trigger reductive elimination.
article_processing_charge: No
article_type: original
author:
- first_name: Jamal A.
full_name: Malik, Jamal A.
last_name: Malik
- first_name: Amiera
full_name: Madani, Amiera
last_name: Madani
- first_name: Bartholomäus
full_name: Pieber, Bartholomäus
id: 93e5e5b2-0da6-11ed-8a41-af589a024726
last_name: Pieber
orcid: 0000-0001-8689-388X
- first_name: Peter H.
full_name: Seeberger, Peter H.
last_name: Seeberger
citation:
ama: Malik JA, Madani A, Pieber B, Seeberger PH. Evidence for photocatalyst involvement
in oxidative additions of nickel-catalyzed carboxylate O-arylations. Journal
of the American Chemical Society. 2020;142(25):11042-11049. doi:10.1021/jacs.0c02848
apa: Malik, J. A., Madani, A., Pieber, B., & Seeberger, P. H. (2020). Evidence
for photocatalyst involvement in oxidative additions of nickel-catalyzed carboxylate
O-arylations. Journal of the American Chemical Society. American Chemical
Society. https://doi.org/10.1021/jacs.0c02848
chicago: Malik, Jamal A., Amiera Madani, Bartholomäus Pieber, and Peter H. Seeberger.
“Evidence for Photocatalyst Involvement in Oxidative Additions of Nickel-Catalyzed
Carboxylate O-Arylations.” Journal of the American Chemical Society. American
Chemical Society, 2020. https://doi.org/10.1021/jacs.0c02848.
ieee: J. A. Malik, A. Madani, B. Pieber, and P. H. Seeberger, “Evidence for photocatalyst
involvement in oxidative additions of nickel-catalyzed carboxylate O-arylations,”
Journal of the American Chemical Society, vol. 142, no. 25. American Chemical
Society, pp. 11042–11049, 2020.
ista: Malik JA, Madani A, Pieber B, Seeberger PH. 2020. Evidence for photocatalyst
involvement in oxidative additions of nickel-catalyzed carboxylate O-arylations.
Journal of the American Chemical Society. 142(25), 11042–11049.
mla: Malik, Jamal A., et al. “Evidence for Photocatalyst Involvement in Oxidative
Additions of Nickel-Catalyzed Carboxylate O-Arylations.” Journal of the American
Chemical Society, vol. 142, no. 25, American Chemical Society, 2020, pp. 11042–49,
doi:10.1021/jacs.0c02848.
short: J.A. Malik, A. Madani, B. Pieber, P.H. Seeberger, Journal of the American
Chemical Society 142 (2020) 11042–11049.
date_created: 2022-08-25T10:57:38Z
date_published: 2020-06-24T00:00:00Z
date_updated: 2023-02-21T10:10:06Z
day: '24'
doi: 10.1021/jacs.0c02848
extern: '1'
external_id:
pmid:
- '32469219'
intvolume: ' 142'
issue: '25'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://doi.org/10.1021/jacs.0c02848
month: '06'
oa: 1
oa_version: Published Version
page: 11042-11049
pmid: 1
publication: Journal of the American Chemical Society
publication_identifier:
eissn:
- 1520-5126
issn:
- 0002-7863
publication_status: published
publisher: American Chemical Society
quality_controlled: '1'
scopus_import: '1'
status: public
title: Evidence for photocatalyst involvement in oxidative additions of nickel-catalyzed
carboxylate O-arylations
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 142
year: '2020'
...
---
_id: '11979'
abstract:
- lang: eng
text: Dual photoredox/nickel-catalysed C–N cross-couplings suffer from low yields
for electron-rich aryl halides. The formation of catalytically inactive nickel-black
is responsible for this limitation and causes severe reproducibility issues. Here,
we demonstrate that catalyst deactivation can be avoided by using a carbon nitride
photocatalyst. The broad absorption of the heterogeneous photocatalyst enables
wavelength-dependent control of the rate of reductive elimination to prevent nickel-black
formation during the coupling of cyclic, secondary amines and aryl halides. A
second approach, which is applicable to a broader set of electron-rich aryl halides,
is to run the reactions at high concentrations to increase the rate of oxidative
addition. Less nucleophilic, primary amines can be coupled with electron-rich
aryl halides by stabilizing low-valent nickel intermediates with a suitable additive.
The developed protocols enable reproducible, selective C–N cross-couplings of
electron-rich aryl bromides and can also be applied for electron-poor aryl chlorides.
article_processing_charge: No
article_type: original
author:
- first_name: Sebastian
full_name: Gisbertz, Sebastian
last_name: Gisbertz
- first_name: Susanne
full_name: Reischauer, Susanne
last_name: Reischauer
- first_name: Bartholomäus
full_name: Pieber, Bartholomäus
id: 93e5e5b2-0da6-11ed-8a41-af589a024726
last_name: Pieber
orcid: 0000-0001-8689-388X
citation:
ama: Gisbertz S, Reischauer S, Pieber B. Overcoming limitations in dual photoredox/nickel-catalysed
C–N cross-couplings due to catalyst deactivation. Nature Catalysis. 2020;3(8):611-620.
doi:10.1038/s41929-020-0473-6
apa: Gisbertz, S., Reischauer, S., & Pieber, B. (2020). Overcoming limitations
in dual photoredox/nickel-catalysed C–N cross-couplings due to catalyst deactivation.
Nature Catalysis. Springer Nature. https://doi.org/10.1038/s41929-020-0473-6
chicago: Gisbertz, Sebastian, Susanne Reischauer, and Bartholomäus Pieber. “Overcoming
Limitations in Dual Photoredox/Nickel-Catalysed C–N Cross-Couplings Due to Catalyst
Deactivation.” Nature Catalysis. Springer Nature, 2020. https://doi.org/10.1038/s41929-020-0473-6.
ieee: S. Gisbertz, S. Reischauer, and B. Pieber, “Overcoming limitations in dual
photoredox/nickel-catalysed C–N cross-couplings due to catalyst deactivation,”
Nature Catalysis, vol. 3, no. 8. Springer Nature, pp. 611–620, 2020.
ista: Gisbertz S, Reischauer S, Pieber B. 2020. Overcoming limitations in dual photoredox/nickel-catalysed
C–N cross-couplings due to catalyst deactivation. Nature Catalysis. 3(8), 611–620.
mla: Gisbertz, Sebastian, et al. “Overcoming Limitations in Dual Photoredox/Nickel-Catalysed
C–N Cross-Couplings Due to Catalyst Deactivation.” Nature Catalysis, vol.
3, no. 8, Springer Nature, 2020, pp. 611–20, doi:10.1038/s41929-020-0473-6.
short: S. Gisbertz, S. Reischauer, B. Pieber, Nature Catalysis 3 (2020) 611–620.
date_created: 2022-08-25T11:06:16Z
date_published: 2020-08-01T00:00:00Z
date_updated: 2023-02-21T10:10:09Z
day: '01'
doi: 10.1038/s41929-020-0473-6
extern: '1'
intvolume: ' 3'
issue: '8'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://doi.org/10.26434/chemrxiv.10298735
month: '08'
oa: 1
oa_version: Preprint
page: 611-620
publication: Nature Catalysis
publication_identifier:
eissn:
- 2520-1158
publication_status: published
publisher: Springer Nature
quality_controlled: '1'
scopus_import: '1'
status: public
title: Overcoming limitations in dual photoredox/nickel-catalysed C–N cross-couplings
due to catalyst deactivation
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 3
year: '2020'
...
---
_id: '11980'
abstract:
- lang: eng
text: Small organic radicals are ubiquitous intermediates in photocatalysis and
are used in organic synthesis to install functional groups and to tune electronic
properties and pharmacokinetic parameters of the final molecule. Development of
new methods to generate small organic radicals with added functionality can further
extend the utility of photocatalysis for synthetic needs. Herein, we present a
method to generate dichloromethyl radicals from chloroform using a heterogeneous
potassium poly(heptazine imide) (K-PHI) photocatalyst under visible light irradiation
for C1-extension of the enone backbone. The method is applied on 15 enones, with
γ,γ-dichloroketones yields of 18–89%. Due to negative zeta-potential (−40 mV)
and small particle size (100 nm) K-PHI suspension is used in quasi-homogeneous
flow-photoreactor increasing the productivity by 19 times compared to the batch
approach. The resulting γ,γ-dichloroketones, are used as bifunctional building
blocks to access value-added organic compounds such as substituted furans and
pyrroles.
article_number: '1387'
article_processing_charge: No
article_type: original
author:
- first_name: Stefano
full_name: Mazzanti, Stefano
last_name: Mazzanti
- first_name: Bogdan
full_name: Kurpil, Bogdan
last_name: Kurpil
- first_name: Bartholomäus
full_name: Pieber, Bartholomäus
id: 93e5e5b2-0da6-11ed-8a41-af589a024726
last_name: Pieber
orcid: 0000-0001-8689-388X
- first_name: Markus
full_name: Antonietti, Markus
last_name: Antonietti
- first_name: Aleksandr
full_name: Savateev, Aleksandr
last_name: Savateev
citation:
ama: Mazzanti S, Kurpil B, Pieber B, Antonietti M, Savateev A. Dichloromethylation
of enones by carbon nitride photocatalysis. Nature Communications. 2020;11.
doi:10.1038/s41467-020-15131-0
apa: Mazzanti, S., Kurpil, B., Pieber, B., Antonietti, M., & Savateev, A. (2020).
Dichloromethylation of enones by carbon nitride photocatalysis. Nature Communications.
Springer Nature. https://doi.org/10.1038/s41467-020-15131-0
chicago: Mazzanti, Stefano, Bogdan Kurpil, Bartholomäus Pieber, Markus Antonietti,
and Aleksandr Savateev. “Dichloromethylation of Enones by Carbon Nitride Photocatalysis.”
Nature Communications. Springer Nature, 2020. https://doi.org/10.1038/s41467-020-15131-0.
ieee: S. Mazzanti, B. Kurpil, B. Pieber, M. Antonietti, and A. Savateev, “Dichloromethylation
of enones by carbon nitride photocatalysis,” Nature Communications, vol.
11. Springer Nature, 2020.
ista: Mazzanti S, Kurpil B, Pieber B, Antonietti M, Savateev A. 2020. Dichloromethylation
of enones by carbon nitride photocatalysis. Nature Communications. 11, 1387.
mla: Mazzanti, Stefano, et al. “Dichloromethylation of Enones by Carbon Nitride
Photocatalysis.” Nature Communications, vol. 11, 1387, Springer Nature,
2020, doi:10.1038/s41467-020-15131-0.
short: S. Mazzanti, B. Kurpil, B. Pieber, M. Antonietti, A. Savateev, Nature Communications
11 (2020).
date_created: 2022-08-25T11:10:15Z
date_published: 2020-03-13T00:00:00Z
date_updated: 2023-02-21T10:10:14Z
day: '13'
doi: 10.1038/s41467-020-15131-0
extern: '1'
intvolume: ' 11'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://doi.org/10.1038/s41467-020-15131-0
month: '03'
oa: 1
oa_version: Published Version
publication: Nature Communications
publication_identifier:
eissn:
- 2041-1723
publication_status: published
publisher: Springer Nature
quality_controlled: '1'
scopus_import: '1'
status: public
title: Dichloromethylation of enones by carbon nitride photocatalysis
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 11
year: '2020'
...
---
_id: '11986'
abstract:
- lang: eng
text: Carbon nitride materials have emerged as an efficient and sustainable class
of heterogeneous photocatalysts, particularly when paired with nickel in dual
catalytic cross-coupling reactions. Performing these transformations on larger
scales using a continuous process is difficult due to the problems associated
with handling solids in flow. By combining an oscillatory pump with a microstructured
plug flow photoreactor, a stable suspension of the photocatalyst can be maintained,
circumventing clogging of the reactor channels. Through careful tuning of the
oscillator properties, the residence time distribution (RTD) was optimized, whilst
maintaining a stable catalyst suspension. Short residence times (20 min) were
achieved using optimized conditions and the recyclability of the photocatalyst
was demonstrated over 10 cycles with no loss of activity. During a stable 4.5
hour scale-out demonstration, the model substrate could be isolated on 12 g scale
(90% yield, 2.67 g h−1). Moreover, the method was applied for the gram scale synthesis
of an intermediate of the active pharmaceutical ingredient tetracaine.
article_processing_charge: No
article_type: original
author:
- first_name: Cristian
full_name: Rosso, Cristian
last_name: Rosso
- first_name: Sebastian
full_name: Gisbertz, Sebastian
last_name: Gisbertz
- first_name: Jason D.
full_name: Williams, Jason D.
last_name: Williams
- first_name: Hannes P. L.
full_name: Gemoets, Hannes P. L.
last_name: Gemoets
- first_name: Wouter
full_name: Debrouwer, Wouter
last_name: Debrouwer
- first_name: Bartholomäus
full_name: Pieber, Bartholomäus
id: 93e5e5b2-0da6-11ed-8a41-af589a024726
last_name: Pieber
orcid: 0000-0001-8689-388X
- first_name: C. Oliver
full_name: Kappe, C. Oliver
last_name: Kappe
citation:
ama: Rosso C, Gisbertz S, Williams JD, et al. An oscillatory plug flow photoreactor
facilitates semi-heterogeneous dual nickel/carbon nitride photocatalytic C–N couplings.
Reaction Chemistry and Engineering. 2020;5(3):597-604. doi:10.1039/d0re00036a
apa: Rosso, C., Gisbertz, S., Williams, J. D., Gemoets, H. P. L., Debrouwer, W.,
Pieber, B., & Kappe, C. O. (2020). An oscillatory plug flow photoreactor facilitates
semi-heterogeneous dual nickel/carbon nitride photocatalytic C–N couplings. Reaction
Chemistry and Engineering. Royal Society of Chemistry. https://doi.org/10.1039/d0re00036a
chicago: Rosso, Cristian, Sebastian Gisbertz, Jason D. Williams, Hannes P. L. Gemoets,
Wouter Debrouwer, Bartholomäus Pieber, and C. Oliver Kappe. “An Oscillatory Plug
Flow Photoreactor Facilitates Semi-Heterogeneous Dual Nickel/Carbon Nitride Photocatalytic
C–N Couplings.” Reaction Chemistry and Engineering. Royal Society of Chemistry,
2020. https://doi.org/10.1039/d0re00036a.
ieee: C. Rosso et al., “An oscillatory plug flow photoreactor facilitates
semi-heterogeneous dual nickel/carbon nitride photocatalytic C–N couplings,” Reaction
Chemistry and Engineering, vol. 5, no. 3. Royal Society of Chemistry, pp.
597–604, 2020.
ista: Rosso C, Gisbertz S, Williams JD, Gemoets HPL, Debrouwer W, Pieber B, Kappe
CO. 2020. An oscillatory plug flow photoreactor facilitates semi-heterogeneous
dual nickel/carbon nitride photocatalytic C–N couplings. Reaction Chemistry and
Engineering. 5(3), 597–604.
mla: Rosso, Cristian, et al. “An Oscillatory Plug Flow Photoreactor Facilitates
Semi-Heterogeneous Dual Nickel/Carbon Nitride Photocatalytic C–N Couplings.” Reaction
Chemistry and Engineering, vol. 5, no. 3, Royal Society of Chemistry, 2020,
pp. 597–604, doi:10.1039/d0re00036a.
short: C. Rosso, S. Gisbertz, J.D. Williams, H.P.L. Gemoets, W. Debrouwer, B. Pieber,
C.O. Kappe, Reaction Chemistry and Engineering 5 (2020) 597–604.
date_created: 2022-08-25T11:45:02Z
date_published: 2020-03-01T00:00:00Z
date_updated: 2023-02-21T10:10:28Z
day: '01'
doi: 10.1039/d0re00036a
extern: '1'
intvolume: ' 5'
issue: '3'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://doi.org/10.1039/D0RE00036A
month: '03'
oa: 1
oa_version: Published Version
page: 597-604
publication: Reaction Chemistry and Engineering
publication_identifier:
eissn:
- 2058-9883
publication_status: published
publisher: Royal Society of Chemistry
quality_controlled: '1'
scopus_import: '1'
status: public
title: An oscillatory plug flow photoreactor facilitates semi-heterogeneous dual nickel/carbon
nitride photocatalytic C–N couplings
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 5
year: '2020'
...
---
_id: '12192'
abstract:
- lang: eng
text: Transposable elements (TEs), the movement of which can damage the genome,
are epigenetically silenced in eukaryotes. Intriguingly, TEs are activated in
the sperm companion cell – vegetative cell (VC) – of the flowering plant Arabidopsis
thaliana. However, the extent and mechanism of this activation are unknown. Here
we show that about 100 heterochromatic TEs are activated in VCs, mostly by DEMETER-catalyzed
DNA demethylation. We further demonstrate that DEMETER access to some of these
TEs is permitted by the natural depletion of linker histone H1 in VCs. Ectopically
expressed H1 suppresses TEs in VCs by reducing DNA demethylation and via a methylation-independent
mechanism. We demonstrate that H1 is required for heterochromatin condensation
in plant cells and show that H1 overexpression creates heterochromatic foci in
the VC progenitor cell. Taken together, our results demonstrate that the natural
depletion of H1 during male gametogenesis facilitates DEMETER-directed DNA demethylation,
heterochromatin relaxation, and TE activation.
acknowledgement: We thank David Twell for the pDONR-P4-P1R-pLAT52 and pDONR-P2R-P3-mRFP
vectors, the John Innes Centre Bioimaging Facility (Elaine Barclay and Grant Calder)
for their assistance with microscopy, and the Norwich BioScience Institute Partnership
Computing infrastructure for Science Group for High Performance Computing resources.
This work was funded by a Biotechnology and Biological Sciences Research Council
(BBSRC) David Phillips Fellowship (BB/L025043/1; SH, JZ and XF), a European Research
Council Starting Grant ('SexMeth' 804981; XF) and a Grant to Exceptional Researchers
by the Gatsby Charitable Foundation (SH and XF).
article_number: '42530'
article_processing_charge: No
article_type: original
author:
- first_name: Shengbo
full_name: He, Shengbo
last_name: He
- first_name: Martin
full_name: Vickers, Martin
last_name: Vickers
- first_name: Jingyi
full_name: Zhang, Jingyi
last_name: Zhang
- first_name: Xiaoqi
full_name: Feng, Xiaoqi
id: e0164712-22ee-11ed-b12a-d80fcdf35958
last_name: Feng
orcid: 0000-0002-4008-1234
citation:
ama: He S, Vickers M, Zhang J, Feng X. Natural depletion of histone H1 in sex cells
causes DNA demethylation, heterochromatin decondensation and transposon activation.
eLife. 2019;8. doi:10.7554/elife.42530
apa: He, S., Vickers, M., Zhang, J., & Feng, X. (2019). Natural depletion of
histone H1 in sex cells causes DNA demethylation, heterochromatin decondensation
and transposon activation. ELife. eLife Sciences Publications, Ltd. https://doi.org/10.7554/elife.42530
chicago: He, Shengbo, Martin Vickers, Jingyi Zhang, and Xiaoqi Feng. “Natural Depletion
of Histone H1 in Sex Cells Causes DNA Demethylation, Heterochromatin Decondensation
and Transposon Activation.” ELife. eLife Sciences Publications, Ltd, 2019.
https://doi.org/10.7554/elife.42530.
ieee: S. He, M. Vickers, J. Zhang, and X. Feng, “Natural depletion of histone H1
in sex cells causes DNA demethylation, heterochromatin decondensation and transposon
activation,” eLife, vol. 8. eLife Sciences Publications, Ltd, 2019.
ista: He S, Vickers M, Zhang J, Feng X. 2019. Natural depletion of histone H1 in
sex cells causes DNA demethylation, heterochromatin decondensation and transposon
activation. eLife. 8, 42530.
mla: He, Shengbo, et al. “Natural Depletion of Histone H1 in Sex Cells Causes DNA
Demethylation, Heterochromatin Decondensation and Transposon Activation.” ELife,
vol. 8, 42530, eLife Sciences Publications, Ltd, 2019, doi:10.7554/elife.42530.
short: S. He, M. Vickers, J. Zhang, X. Feng, ELife 8 (2019).
date_created: 2023-01-16T09:17:21Z
date_published: 2019-05-28T00:00:00Z
date_updated: 2023-05-08T10:54:12Z
day: '28'
ddc:
- '580'
department:
- _id: XiFe
doi: 10.7554/elife.42530
extern: '1'
external_id:
unknown:
- '31135340'
file:
- access_level: open_access
checksum: ea6b89c20d59e5eb3646916fe5d568ad
content_type: application/pdf
creator: alisjak
date_created: 2023-02-07T09:42:46Z
date_updated: 2023-02-07T09:42:46Z
file_id: '12525'
file_name: 2019_elife_He.pdf
file_size: 2493837
relation: main_file
success: 1
file_date_updated: 2023-02-07T09:42:46Z
has_accepted_license: '1'
intvolume: ' 8'
keyword:
- General Immunology and Microbiology
- General Biochemistry
- Genetics and Molecular Biology
- General Medicine
- General Neuroscience
language:
- iso: eng
license: https://creativecommons.org/licenses/by/4.0/
main_file_link:
- open_access: '1'
url: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6594752/
month: '05'
oa: 1
oa_version: Published Version
publication: eLife
publication_identifier:
issn:
- 2050-084X
publication_status: published
publisher: eLife Sciences Publications, Ltd
quality_controlled: '1'
scopus_import: '1'
status: public
title: Natural depletion of histone H1 in sex cells causes DNA demethylation, heterochromatin
decondensation and transposon activation
tmp:
image: /images/cc_by.png
legal_code_url: https://creativecommons.org/licenses/by/4.0/legalcode
name: Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)
short: CC BY (4.0)
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 8
year: '2019'
...
---
_id: '12600'
abstract:
- lang: eng
text: The snow cover dynamics of High Mountain Asia are usually assessed at spatial
resolutions of 250 m or greater, but this scale is too coarse to clearly represent
the rugged topography common to the region. Higher-resolution measurement of snow-covered
area often results in biased sampling due to cloud cover and deep shadows. We
therefore develop a Normalized Difference Snow Index-based workflow to delineate
snow lines from Landsat Thematic Mapper/Enhanced Thematic Mapper+ imagery and
apply it to the upper Langtang Valley in Nepal, processing 194 scenes spanning
1999 to 2013. For each scene, we determine the spatial distribution of snow line
altitudes (SLAs) with respect to aspect and across six subcatchments. Our results
show that the mean SLA exhibits distinct seasonal behavior based on aspect and
subcatchment position. We find that SLA dynamics respond to spatial and seasonal
trade-offs in precipitation, temperature, and solar radiation, which act as primary
controls. We identify two SLA spatial gradients, which we attribute to the effect
of spatially variable precipitation. Our results also reveal that aspect-related
SLA differences vary seasonally and are influenced by solar radiation. In terms
of seasonal dominant controls, we demonstrate that the snow line is controlled
by snow precipitation in winter, melt in premonsoon, a combination of both in
postmonsoon, and temperature in monsoon, explaining to a large extent the spatial
and seasonal variability of the SLA in the upper Langtang Valley. We conclude
that while SLA and snow-covered area are complementary metrics, the SLA has a
strong potential for understanding local-scale snow cover dynamics and their controlling
mechanisms.
article_processing_charge: No
article_type: original
author:
- first_name: Marc
full_name: Girona‐Mata, Marc
last_name: Girona‐Mata
- first_name: Evan S.
full_name: Miles, Evan S.
last_name: Miles
- first_name: Silvan
full_name: Ragettli, Silvan
last_name: Ragettli
- first_name: Francesca
full_name: Pellicciotti, Francesca
id: b28f055a-81ea-11ed-b70c-a9fe7f7b0e70
last_name: Pellicciotti
citation:
ama: Girona‐Mata M, Miles ES, Ragettli S, Pellicciotti F. High‐resolution snowline
delineation from Landsat imagery to infer snow cover controls in a Himalayan catchment.
Water Resources Research. 2019;55(8):6754-6772. doi:10.1029/2019wr024935
apa: Girona‐Mata, M., Miles, E. S., Ragettli, S., & Pellicciotti, F. (2019).
High‐resolution snowline delineation from Landsat imagery to infer snow cover
controls in a Himalayan catchment. Water Resources Research. American Geophysical
Union. https://doi.org/10.1029/2019wr024935
chicago: Girona‐Mata, Marc, Evan S. Miles, Silvan Ragettli, and Francesca Pellicciotti.
“High‐resolution Snowline Delineation from Landsat Imagery to Infer Snow Cover
Controls in a Himalayan Catchment.” Water Resources Research. American
Geophysical Union, 2019. https://doi.org/10.1029/2019wr024935.
ieee: M. Girona‐Mata, E. S. Miles, S. Ragettli, and F. Pellicciotti, “High‐resolution
snowline delineation from Landsat imagery to infer snow cover controls in a Himalayan
catchment,” Water Resources Research, vol. 55, no. 8. American Geophysical
Union, pp. 6754–6772, 2019.
ista: Girona‐Mata M, Miles ES, Ragettli S, Pellicciotti F. 2019. High‐resolution
snowline delineation from Landsat imagery to infer snow cover controls in a Himalayan
catchment. Water Resources Research. 55(8), 6754–6772.
mla: Girona‐Mata, Marc, et al. “High‐resolution Snowline Delineation from Landsat
Imagery to Infer Snow Cover Controls in a Himalayan Catchment.” Water Resources
Research, vol. 55, no. 8, American Geophysical Union, 2019, pp. 6754–72, doi:10.1029/2019wr024935.
short: M. Girona‐Mata, E.S. Miles, S. Ragettli, F. Pellicciotti, Water Resources
Research 55 (2019) 6754–6772.
date_created: 2023-02-20T08:12:59Z
date_published: 2019-08-01T00:00:00Z
date_updated: 2023-02-28T12:14:18Z
day: '01'
doi: 10.1029/2019wr024935
extern: '1'
intvolume: ' 55'
issue: '8'
keyword:
- Water Science and Technology
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://doi.org/10.1029/2019WR024935
month: '08'
oa: 1
oa_version: Published Version
page: 6754-6772
publication: Water Resources Research
publication_identifier:
eissn:
- 1944-7973
issn:
- 0043-1397
publication_status: published
publisher: American Geophysical Union
quality_controlled: '1'
scopus_import: '1'
status: public
title: High‐resolution snowline delineation from Landsat imagery to infer snow cover
controls in a Himalayan catchment
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 55
year: '2019'
...
---
_id: '12601'
abstract:
- lang: eng
text: Ice cliffs and ponds on debris-covered glaciers have received increased attention
due to their role in amplifying local melt. However, very few studies have looked
at these features on the catchment scale to determine their patterns and changes
in space and time. We have compiled a detailed inventory of cliffs and ponds in
the Langtang catchment, central Himalaya, from six high-resolution satellite orthoimages
and DEMs between 2006 and 2015, and a historic orthophoto from 1974. Cliffs cover
between 1.4% (± 0.4%) in the dry and 3.4% (± 0.9%) in the wet seasons and ponds
between 0.6% (± 0.1%) and 1.6% (± 0.3%) of the total debris-covered tongues. We
find large variations between seasons, as cliffs and ponds tend to grow in the
wetter monsoon period, but there is no obvious trend in total area over the study
period. The inventory further shows that cliffs are predominately north-facing
irrespective of the glacier flow direction. Both cliffs and ponds appear in higher
densities several hundred metres from the terminus in areas where tributaries
reach the main glacier tongue. On the largest glacier in the catchment ~10% of
all cliffs and ponds persisted over nearly a decade.
article_processing_charge: No
article_type: original
author:
- first_name: JAKOB F.
full_name: STEINER, JAKOB F.
last_name: STEINER
- first_name: PASCAL
full_name: BURI, PASCAL
last_name: BURI
- first_name: EVAN S.
full_name: MILES, EVAN S.
last_name: MILES
- first_name: SILVAN
full_name: RAGETTLI, SILVAN
last_name: RAGETTLI
- first_name: Francesca
full_name: Pellicciotti, Francesca
id: b28f055a-81ea-11ed-b70c-a9fe7f7b0e70
last_name: Pellicciotti
citation:
ama: 'STEINER JF, BURI P, MILES ES, RAGETTLI S, Pellicciotti F. Supraglacial ice
cliffs and ponds on debris-covered glaciers: Spatio-temporal distribution and
characteristics. Journal of Glaciology. 2019;65(252):617-632. doi:10.1017/jog.2019.40'
apa: 'STEINER, J. F., BURI, P., MILES, E. S., RAGETTLI, S., & Pellicciotti,
F. (2019). Supraglacial ice cliffs and ponds on debris-covered glaciers: Spatio-temporal
distribution and characteristics. Journal of Glaciology. Cambridge University
Press. https://doi.org/10.1017/jog.2019.40'
chicago: 'STEINER, JAKOB F., PASCAL BURI, EVAN S. MILES, SILVAN RAGETTLI, and Francesca
Pellicciotti. “Supraglacial Ice Cliffs and Ponds on Debris-Covered Glaciers: Spatio-Temporal
Distribution and Characteristics.” Journal of Glaciology. Cambridge University
Press, 2019. https://doi.org/10.1017/jog.2019.40.'
ieee: 'J. F. STEINER, P. BURI, E. S. MILES, S. RAGETTLI, and F. Pellicciotti, “Supraglacial
ice cliffs and ponds on debris-covered glaciers: Spatio-temporal distribution
and characteristics,” Journal of Glaciology, vol. 65, no. 252. Cambridge
University Press, pp. 617–632, 2019.'
ista: 'STEINER JF, BURI P, MILES ES, RAGETTLI S, Pellicciotti F. 2019. Supraglacial
ice cliffs and ponds on debris-covered glaciers: Spatio-temporal distribution
and characteristics. Journal of Glaciology. 65(252), 617–632.'
mla: 'STEINER, JAKOB F., et al. “Supraglacial Ice Cliffs and Ponds on Debris-Covered
Glaciers: Spatio-Temporal Distribution and Characteristics.” Journal of Glaciology,
vol. 65, no. 252, Cambridge University Press, 2019, pp. 617–32, doi:10.1017/jog.2019.40.'
short: J.F. STEINER, P. BURI, E.S. MILES, S. RAGETTLI, F. Pellicciotti, Journal
of Glaciology 65 (2019) 617–632.
date_created: 2023-02-20T08:13:03Z
date_published: 2019-08-01T00:00:00Z
date_updated: 2023-02-28T12:11:07Z
day: '01'
doi: 10.1017/jog.2019.40
extern: '1'
intvolume: ' 65'
issue: '252'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://doi.org/10.1017/jog.2019.40
month: '08'
oa: 1
oa_version: Published Version
page: 617-632
publication: Journal of Glaciology
publication_identifier:
eissn:
- 1727-5652
issn:
- 0022-1430
publication_status: published
publisher: Cambridge University Press
quality_controlled: '1'
scopus_import: '1'
status: public
title: 'Supraglacial ice cliffs and ponds on debris-covered glaciers: Spatio-temporal
distribution and characteristics'
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 65
year: '2019'
...
---
_id: '12602'
abstract:
- lang: eng
text: 'This study aims at developing and applying a spatially-distributed coupled
glacier mass balance and ice-flow model to attribute the response of glaciers
to natural and anthropogenic climate change. We focus on two glaciers with contrasting
surface characteristics: a debris-covered glacier (Langtang Glacier in Nepal)
and a clean-ice glacier (Hintereisferner in Austria). The model is applied from
the end of the Little Ice Age (1850) to the present-day (2016) and is forced with
four bias-corrected General Circulation Models (GCMs) from the historical experiment
of the CMIP5 archive. The selected GCMs represent region-specific warm-dry, warm-wet,
cold-dry, and cold-wet climate conditions. To isolate the effects of anthropogenic
climate change on glacier mass balance and flow runs from these GCMs with and
without further anthropogenic forcing after 1970 until 2016 are selected. The
outcomes indicate that both glaciers experience the largest reduction in area
and volume under warm climate conditions, whereas area and volume reductions are
smaller under cold climate conditions. Simultaneously with changes in glacier
area and volume, surface velocities generally decrease over time. Without further
anthropogenic forcing the results reveal a 3% (9%) smaller decline in glacier
area (volume) for the debris-covered glacier and a 18% (39%) smaller decline in
glacier area (volume) for the clean-ice glacier. The difference in the magnitude
between the two glaciers can mainly be attributed to differences in the response
time of the glaciers, where the clean-ice glacier shows a much faster response
to climate change. We conclude that the response of the two glaciers can mainly
be attributed to anthropogenic climate change and that the impact is larger on
the clean-ice glacier. The outcomes show that the model performs well under different
climate conditions and that the developed approach can be used for regional-scale
glacio-hydrological modeling.'
article_number: '143'
article_processing_charge: No
article_type: original
author:
- first_name: René R.
full_name: Wijngaard, René R.
last_name: Wijngaard
- first_name: Jakob F.
full_name: Steiner, Jakob F.
last_name: Steiner
- first_name: Philip D. A.
full_name: Kraaijenbrink, Philip D. A.
last_name: Kraaijenbrink
- first_name: Christoph
full_name: Klug, Christoph
last_name: Klug
- first_name: Surendra
full_name: Adhikari, Surendra
last_name: Adhikari
- first_name: Argha
full_name: Banerjee, Argha
last_name: Banerjee
- first_name: Francesca
full_name: Pellicciotti, Francesca
id: b28f055a-81ea-11ed-b70c-a9fe7f7b0e70
last_name: Pellicciotti
- first_name: Ludovicus P. H.
full_name: van Beek, Ludovicus P. H.
last_name: van Beek
- first_name: Marc F. P.
full_name: Bierkens, Marc F. P.
last_name: Bierkens
- first_name: Arthur F.
full_name: Lutz, Arthur F.
last_name: Lutz
- first_name: Walter W.
full_name: Immerzeel, Walter W.
last_name: Immerzeel
citation:
ama: Wijngaard RR, Steiner JF, Kraaijenbrink PDA, et al. Modeling the response of
the Langtang Glacier and the Hintereisferner to a changing climate since the Little
Ice Age. Frontiers in Earth Science. 2019;7. doi:10.3389/feart.2019.00143
apa: Wijngaard, R. R., Steiner, J. F., Kraaijenbrink, P. D. A., Klug, C., Adhikari,
S., Banerjee, A., … Immerzeel, W. W. (2019). Modeling the response of the Langtang
Glacier and the Hintereisferner to a changing climate since the Little Ice Age.
Frontiers in Earth Science. Frontiers Media. https://doi.org/10.3389/feart.2019.00143
chicago: Wijngaard, René R., Jakob F. Steiner, Philip D. A. Kraaijenbrink, Christoph
Klug, Surendra Adhikari, Argha Banerjee, Francesca Pellicciotti, et al. “Modeling
the Response of the Langtang Glacier and the Hintereisferner to a Changing Climate
since the Little Ice Age.” Frontiers in Earth Science. Frontiers Media,
2019. https://doi.org/10.3389/feart.2019.00143.
ieee: R. R. Wijngaard et al., “Modeling the response of the Langtang Glacier
and the Hintereisferner to a changing climate since the Little Ice Age,” Frontiers
in Earth Science, vol. 7. Frontiers Media, 2019.
ista: Wijngaard RR, Steiner JF, Kraaijenbrink PDA, Klug C, Adhikari S, Banerjee
A, Pellicciotti F, van Beek LPH, Bierkens MFP, Lutz AF, Immerzeel WW. 2019. Modeling
the response of the Langtang Glacier and the Hintereisferner to a changing climate
since the Little Ice Age. Frontiers in Earth Science. 7, 143.
mla: Wijngaard, René R., et al. “Modeling the Response of the Langtang Glacier and
the Hintereisferner to a Changing Climate since the Little Ice Age.” Frontiers
in Earth Science, vol. 7, 143, Frontiers Media, 2019, doi:10.3389/feart.2019.00143.
short: R.R. Wijngaard, J.F. Steiner, P.D.A. Kraaijenbrink, C. Klug, S. Adhikari,
A. Banerjee, F. Pellicciotti, L.P.H. van Beek, M.F.P. Bierkens, A.F. Lutz, W.W.
Immerzeel, Frontiers in Earth Science 7 (2019).
date_created: 2023-02-20T08:13:08Z
date_published: 2019-06-04T00:00:00Z
date_updated: 2023-02-28T12:04:48Z
day: '04'
doi: 10.3389/feart.2019.00143
extern: '1'
intvolume: ' 7'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://doi.org/10.3389/feart.2019.00143
month: '06'
oa: 1
oa_version: Published Version
publication: Frontiers in Earth Science
publication_identifier:
issn:
- 2296-6463
publication_status: published
publisher: Frontiers Media
quality_controlled: '1'
scopus_import: '1'
status: public
title: Modeling the response of the Langtang Glacier and the Hintereisferner to a
changing climate since the Little Ice Age
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 7
year: '2019'
...