---
_id: '1036'
abstract:
- lang: eng
text: We report on the control of interaction-induced dephasing of Bloch oscillations
for an atomic Bose-Einstein condensate in an optical lattice. We quantify the
dephasing in terms of the width of the quasimomentum distribution and measure
its dependence on time for different interaction strengths which we control by
means of a Feshbach resonance. For minimal interaction, the dephasing time is
increased from a few to more than 20 thousand Bloch oscillation periods, allowing
us to realize a BEC-based atom interferometer in the noninteracting limit.
acknowledgement: "We thank A. Daley for theoretical support and for help with\r\nsetting
\ up the numerical calculations and A. Buchleitner\r\nand his group for useful
\ discussions. We are grateful to\r\nA. Liem and H. Zellmer for valuable assistance
in setting\r\nup the 1064 nm fiber amplifier system. We acknowledge\r\ncontributions
\ by P. Unterwaditzer and T. Flir during the\r\nearly stages of the
\ experiment. We are indebted to\r\nR. Grimm for generous support and
\ gratefully acknowledge funding by the Austrian Ministry of Science and\r\nResearch
(BMWF) and the Austrian Science Fund (FWF)."
article_processing_charge: No
arxiv: 1
author:
- first_name: Mattias
full_name: Gustavsson, Mattias
last_name: Gustavsson
- first_name: Elmar
full_name: Haller, Elmar
last_name: Haller
- first_name: Manfred
full_name: Mark, Manfred
last_name: Mark
- first_name: Johann G
full_name: Danzl, Johann G
id: 42EFD3B6-F248-11E8-B48F-1D18A9856A87
last_name: Danzl
orcid: 0000-0001-8559-3973
- first_name: Gabriel
full_name: Rojas Kopeinig, Gabriel
last_name: Rojas Kopeinig
- first_name: Hanns
full_name: Nägerl, Hanns
last_name: Nägerl
citation:
ama: Gustavsson M, Haller E, Mark M, Danzl JG, Rojas Kopeinig G, Nägerl H. Control
of interaction-induced dephasing of bloch oscillations. Physical Review Letters.
2008;100(8). doi:10.1103/PhysRevLett.100.080404
apa: Gustavsson, M., Haller, E., Mark, M., Danzl, J. G., Rojas Kopeinig, G., &
Nägerl, H. (2008). Control of interaction-induced dephasing of bloch oscillations.
Physical Review Letters. American Physical Society. https://doi.org/10.1103/PhysRevLett.100.080404
chicago: Gustavsson, Mattias, Elmar Haller, Manfred Mark, Johann G Danzl, Gabriel
Rojas Kopeinig, and Hanns Nägerl. “Control of Interaction-Induced Dephasing of
Bloch Oscillations.” Physical Review Letters. American Physical Society,
2008. https://doi.org/10.1103/PhysRevLett.100.080404.
ieee: M. Gustavsson, E. Haller, M. Mark, J. G. Danzl, G. Rojas Kopeinig, and H.
Nägerl, “Control of interaction-induced dephasing of bloch oscillations,” Physical
Review Letters, vol. 100, no. 8. American Physical Society, 2008.
ista: Gustavsson M, Haller E, Mark M, Danzl JG, Rojas Kopeinig G, Nägerl H. 2008.
Control of interaction-induced dephasing of bloch oscillations. Physical Review
Letters. 100(8).
mla: Gustavsson, Mattias, et al. “Control of Interaction-Induced Dephasing of Bloch
Oscillations.” Physical Review Letters, vol. 100, no. 8, American Physical
Society, 2008, doi:10.1103/PhysRevLett.100.080404.
short: M. Gustavsson, E. Haller, M. Mark, J.G. Danzl, G. Rojas Kopeinig, H. Nägerl,
Physical Review Letters 100 (2008).
date_created: 2018-12-11T11:49:48Z
date_published: 2008-02-28T00:00:00Z
date_updated: 2021-01-12T06:47:49Z
day: '28'
doi: 10.1103/PhysRevLett.100.080404
extern: '1'
external_id:
arxiv:
- '0710.5083'
intvolume: ' 100'
issue: '8'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://arxiv.org/abs/0710.5083
month: '02'
oa: 1
oa_version: None
publication: Physical Review Letters
publication_status: published
publisher: American Physical Society
publist_id: '6353'
status: public
title: Control of interaction-induced dephasing of bloch oscillations
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 100
year: '2008'
...
---
_id: '1037'
abstract:
- lang: eng
text: We experimentally demonstrate Cs2 Feshbach molecules well above the dissociation
threshold, which are stable against spontaneous decay on the time scale of 1s.
An optically trapped sample of ultracold dimers is prepared in a high rotational
state and magnetically tuned into a region with a negative binding energy. The
metastable character of these molecules arises from the large centrifugal barrier
in combination with negligible coupling to states with low rotational angular
momentum. A sharp onset of dissociation with increasing magnetic field is mediated
by a crossing with a lower rotational dimer state and facilitates dissociation
on demand with a well-defined energy.
acknowledgement: We thank S. Du ̈rr and T. Volz for fruitful discussions. We acknowledge
support by the Austrian Science Fund (FWF) within No. SFB 15 (project part 16).
S.K. is supported within the Marie Curie Intra-European Program of the European
Commission. F.F. is supported within the Lise Meitner program of the FWF.
article_processing_charge: No
arxiv: 1
author:
- first_name: Steven
full_name: Knoop, Steven
last_name: Knoop
- first_name: Michael
full_name: Mark, Michael
last_name: Mark
- first_name: Francesca
full_name: Ferlaino, Francesca
last_name: Ferlaino
- first_name: Johann G
full_name: Danzl, Johann G
id: 42EFD3B6-F248-11E8-B48F-1D18A9856A87
last_name: Danzl
orcid: 0000-0001-8559-3973
- first_name: Tobias
full_name: Kraemer, Tobias
last_name: Kraemer
- first_name: Hanns
full_name: Nägerl, Hanns
last_name: Nägerl
- first_name: Rudolf
full_name: Grimm, Rudolf
last_name: Grimm
citation:
ama: Knoop S, Mark M, Ferlaino F, et al. Metastable feshbach molecules in high rotational
states. Physical Review Letters. 2008;100(8). doi:10.1103/PhysRevLett.100.083002
apa: Knoop, S., Mark, M., Ferlaino, F., Danzl, J. G., Kraemer, T., Nägerl, H., &
Grimm, R. (2008). Metastable feshbach molecules in high rotational states. Physical
Review Letters. American Physical Society. https://doi.org/10.1103/PhysRevLett.100.083002
chicago: Knoop, Steven, Michael Mark, Francesca Ferlaino, Johann G Danzl, Tobias
Kraemer, Hanns Nägerl, and Rudolf Grimm. “Metastable Feshbach Molecules in High
Rotational States.” Physical Review Letters. American Physical Society,
2008. https://doi.org/10.1103/PhysRevLett.100.083002.
ieee: S. Knoop et al., “Metastable feshbach molecules in high rotational
states,” Physical Review Letters, vol. 100, no. 8. American Physical Society,
2008.
ista: Knoop S, Mark M, Ferlaino F, Danzl JG, Kraemer T, Nägerl H, Grimm R. 2008.
Metastable feshbach molecules in high rotational states. Physical Review Letters.
100(8).
mla: Knoop, Steven, et al. “Metastable Feshbach Molecules in High Rotational States.”
Physical Review Letters, vol. 100, no. 8, American Physical Society, 2008,
doi:10.1103/PhysRevLett.100.083002.
short: S. Knoop, M. Mark, F. Ferlaino, J.G. Danzl, T. Kraemer, H. Nägerl, R. Grimm,
Physical Review Letters 100 (2008).
date_created: 2018-12-11T11:49:49Z
date_published: 2008-02-29T00:00:00Z
date_updated: 2021-01-12T06:47:50Z
day: '29'
doi: 10.1103/PhysRevLett.100.083002
extern: '1'
external_id:
arxiv:
- '0710.4052'
intvolume: ' 100'
issue: '8'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://arxiv.org/abs/0710.4052
month: '02'
oa: 1
oa_version: None
publication: Physical Review Letters
publication_status: published
publisher: American Physical Society
publist_id: '6352'
status: public
title: Metastable feshbach molecules in high rotational states
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 100
year: '2008'
...
---
_id: '1039'
abstract:
- lang: eng
text: Molecular cooling techniques face the hurdle of dissipating translational
as well as internal energy in the presence of a rich electronic, vibrational,
and rotational energy spectrum. In our experiment, we create a translationally
ultracold, dense quantum gas of molecules bound by more than 1000 wave numbers
in the electronic ground state. Specifically, we stimulate with 80% efficiency,
a two-photon transfer of molecules associated on a Feshbach resonance from a Bose-Einstein
condensate of cesium atoms. In the process, the initial loose, long-range electrostatic
bond of the Feshbach molecule is coherently transformed into a tight chemical
bond. We demonstrate coherence of the transfer in a Ramsey-type experiment and
show that the molecular sample is not heated during the transfer. Our results
show that the preparation of a quantum gas of molecules in specific rovibrational
states is possible and that the creation of a Bose-Einstein condensate of molecules
in their rovibronic ground state is within reach.
acknowledgement: " We thank the team of J. Hecker Denschlag, the LevT team in our
group, and T. Bergeman for very helpful discussions and M. Prevedelli for technical
assistance. We are indebted to R. Grimm for generous support and gratefully acknowledge
funding by the Austrian Ministry of Science and Research (Bundesministerium für
Wissenschaft und Forschung) and the Austrian Science Fund (Fonds zur Förderung der
wissenschaftlichen Forschung) in the form of a START prize grant and by the European
Science Foundation in the framework of the EuroQUAM collective research project
QuDipMol.\r\n"
article_processing_charge: No
arxiv: 1
author:
- first_name: Johann G
full_name: Danzl, Johann G
id: 42EFD3B6-F248-11E8-B48F-1D18A9856A87
last_name: Danzl
orcid: 0000-0001-8559-3973
- first_name: Elmar
full_name: Haller, Elmar
last_name: Haller
- first_name: Mattias
full_name: Gustavsson, Mattias
last_name: Gustavsson
- first_name: Manfred
full_name: Mark, Manfred
last_name: Mark
- first_name: Russell
full_name: Hart, Russell
last_name: Hart
- first_name: Nadia
full_name: Bouloufa, Nadia
last_name: Bouloufa
- first_name: Olivier
full_name: Dulieu, Olivier
last_name: Dulieu
- first_name: Helmut
full_name: Ritsch, Helmut
last_name: Ritsch
- first_name: Hanns
full_name: Nägerl, Hanns
last_name: Nägerl
citation:
ama: Danzl JG, Haller E, Gustavsson M, et al. Quantum gas of deeply bound ground
state molecules. Science. 2008;321(5892):1062-1066. doi:10.1126/science.1159909
apa: Danzl, J. G., Haller, E., Gustavsson, M., Mark, M., Hart, R., Bouloufa, N.,
… Nägerl, H. (2008). Quantum gas of deeply bound ground state molecules. Science.
American Association for the Advancement of Science. https://doi.org/10.1126/science.1159909
chicago: Danzl, Johann G, Elmar Haller, Mattias Gustavsson, Manfred Mark, Russell
Hart, Nadia Bouloufa, Olivier Dulieu, Helmut Ritsch, and Hanns Nägerl. “Quantum
Gas of Deeply Bound Ground State Molecules.” Science. American Association
for the Advancement of Science, 2008. https://doi.org/10.1126/science.1159909.
ieee: J. G. Danzl et al., “Quantum gas of deeply bound ground state molecules,”
Science, vol. 321, no. 5892. American Association for the Advancement of
Science, pp. 1062–1066, 2008.
ista: Danzl JG, Haller E, Gustavsson M, Mark M, Hart R, Bouloufa N, Dulieu O, Ritsch
H, Nägerl H. 2008. Quantum gas of deeply bound ground state molecules. Science.
321(5892), 1062–1066.
mla: Danzl, Johann G., et al. “Quantum Gas of Deeply Bound Ground State Molecules.”
Science, vol. 321, no. 5892, American Association for the Advancement of
Science, 2008, pp. 1062–66, doi:10.1126/science.1159909.
short: J.G. Danzl, E. Haller, M. Gustavsson, M. Mark, R. Hart, N. Bouloufa, O. Dulieu,
H. Ritsch, H. Nägerl, Science 321 (2008) 1062–1066.
date_created: 2018-12-11T11:49:49Z
date_published: 2008-08-22T00:00:00Z
date_updated: 2021-01-12T06:47:50Z
day: '22'
doi: 10.1126/science.1159909
extern: '1'
external_id:
arxiv:
- '0806.2284'
intvolume: ' 321'
issue: '5892'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://arxiv.org/abs/0806.2284
month: '08'
oa: 1
oa_version: None
page: 1062 - 1066
publication: Science
publication_status: published
publisher: American Association for the Advancement of Science
publist_id: '6351'
status: public
title: Quantum gas of deeply bound ground state molecules
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 321
year: '2008'
...
---
_id: '10392'
abstract:
- lang: eng
text: Protonated formylmetallocenes [M(C5H5)(C5H4-CHOH)]+ (M = Fe, Ru) and their
isomers have been studied at the BP86 and B3LYP levels of density functional theory.
Oxygen-protonated isomers are the most stable forms in each case, with a plethora
of ring- or metal-protonated species at least ca. 14 and 10 kcal/mol higher in
energy for M = Fe and Ru, respectively. The computed rotational barriers around
the C−C bond connecting the cyclopentadienyl and protonated formyl moieties, ca.
18 kcal/mol, are indicative of substantial conjugation between these moieties.
Some of the ring- and iron-protonated species are models for possible intermediates
in Friedel–Crafts acylation of ferrocene, and the computations provide further
evidence that exo attack is clearly favored over endo attack of the electrophile
in this reaction. The structures of the most stable mono- and diprotonated formylferrocenes
are corroborated by the good agreement between GIAO-B3LYP-computed and experimental
NMR chemical shifts.
acknowledgement: M.B. wishes to thank Prof. W. Thiel and the Max-Planck-Institut für
Kohlenforschung for continuing support. A Humboldt fellowship for V.V. is gratefully
acknowledged. Computations were performed on Compaq XP1000 and ES40 workstations
as well as on an Intel Xeon PC cluster at the MPI Mülheim. A.S. thanks the Computing
Center of the University of Zagreb SRCE for allocating computer time on the Isabella
cluster.
article_processing_charge: No
article_type: original
author:
- first_name: Anđela
full_name: Šarić, Anđela
id: bf63d406-f056-11eb-b41d-f263a6566d8b
last_name: Šarić
orcid: 0000-0002-7854-2139
- first_name: Valerije
full_name: Vrček, Valerije
last_name: Vrček
- first_name: Michael
full_name: Bühl, Michael
last_name: Bühl
citation:
ama: Šarić A, Vrček V, Bühl M. Density functional study of protonated formylmetallocenes.
Organometallics. 2008;27(3):394-401. doi:10.1021/om700916f
apa: Šarić, A., Vrček, V., & Bühl, M. (2008). Density functional study of protonated
formylmetallocenes. Organometallics. American Chemical Society. https://doi.org/10.1021/om700916f
chicago: Šarić, Anđela, Valerije Vrček, and Michael Bühl. “Density Functional Study
of Protonated Formylmetallocenes.” Organometallics. American Chemical Society,
2008. https://doi.org/10.1021/om700916f.
ieee: A. Šarić, V. Vrček, and M. Bühl, “Density functional study of protonated formylmetallocenes,”
Organometallics, vol. 27, no. 3. American Chemical Society, pp. 394–401,
2008.
ista: Šarić A, Vrček V, Bühl M. 2008. Density functional study of protonated formylmetallocenes.
Organometallics. 27(3), 394–401.
mla: Šarić, Anđela, et al. “Density Functional Study of Protonated Formylmetallocenes.”
Organometallics, vol. 27, no. 3, American Chemical Society, 2008, pp. 394–401,
doi:10.1021/om700916f.
short: A. Šarić, V. Vrček, M. Bühl, Organometallics 27 (2008) 394–401.
date_created: 2021-11-29T15:31:06Z
date_published: 2008-01-15T00:00:00Z
date_updated: 2021-11-30T08:04:44Z
day: '15'
doi: 10.1021/om700916f
extern: '1'
intvolume: ' 27'
issue: '3'
keyword:
- Inorganic Chemistry
- Organic Chemistry
- Physical and Theoretical Chemistry
language:
- iso: eng
main_file_link:
- url: https://pubs.acs.org/doi/10.1021/om700916f
month: '01'
oa_version: None
page: 394-401
publication: Organometallics
publication_identifier:
eissn:
- 1520-6041
issn:
- 0276-7333
publication_status: published
publisher: American Chemical Society
quality_controlled: '1'
scopus_import: '1'
status: public
title: Density functional study of protonated formylmetallocenes
type: journal_article
user_id: 8b945eb4-e2f2-11eb-945a-df72226e66a9
volume: 27
year: '2008'
...
---
_id: '11878'
abstract:
- lang: eng
text: "Given only the URL of a web page, can we identify its language? This is the
question that we examine in this paper.\r\nSuch a language classifier is, for
example, useful for crawlers of web search engines, which frequently try to satisfy
certain language quotas. To determine the language of uncrawled web pages, they
have to download the page, which might be wasteful, if the page is not in the
desired language. With URL-based language classifiers these redundant downloads
can be avoided.\r\n\r\nWe apply a variety of machine learning algorithms to the
language identification task and evaluate their performance in extensive experiments
for five languages: English, French, German, Spanish and Italian. Our best methods
achieve an F-measure, averaged over all languages, of around .90 for both a random
sample of 1,260 web page from a large web crawl and for 25k pages from the ODP
directory. For 5k pages of web search engine results we even achieve an F-measure
of .96. The achieved recall for these collections is .93, .88 and .95 respectively.
Two independent human evaluators performed considerably worse on the task, with
an F-measure of .75 and a typical recall of a mere .67. Using only country-code
top-level domains, such as .de or .fr yields a good precision, but a typical recall
of below .60 and an F-measure of around .68."
article_processing_charge: No
article_type: original
author:
- first_name: Eda
full_name: Baykan, Eda
last_name: Baykan
- 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: Ingmar
full_name: Weber, Ingmar
last_name: Weber
citation:
ama: Baykan E, Henzinger MH, Weber I. Web page language identification based on
URLs. Proceedings of the VLDB Endowment. 2008;1(1):176-187. doi:10.14778/1453856.1453880
apa: Baykan, E., Henzinger, M. H., & Weber, I. (2008). Web page language identification
based on URLs. Proceedings of the VLDB Endowment. Association for Computing
Machinery. https://doi.org/10.14778/1453856.1453880
chicago: Baykan, Eda, Monika H Henzinger, and Ingmar Weber. “Web Page Language Identification
Based on URLs.” Proceedings of the VLDB Endowment. Association for Computing
Machinery, 2008. https://doi.org/10.14778/1453856.1453880.
ieee: E. Baykan, M. H. Henzinger, and I. Weber, “Web page language identification
based on URLs,” Proceedings of the VLDB Endowment, vol. 1, no. 1. Association
for Computing Machinery, pp. 176–187, 2008.
ista: Baykan E, Henzinger MH, Weber I. 2008. Web page language identification based
on URLs. Proceedings of the VLDB Endowment. 1(1), 176–187.
mla: Baykan, Eda, et al. “Web Page Language Identification Based on URLs.” Proceedings
of the VLDB Endowment, vol. 1, no. 1, Association for Computing Machinery,
2008, pp. 176–87, doi:10.14778/1453856.1453880.
short: E. Baykan, M.H. Henzinger, I. Weber, Proceedings of the VLDB Endowment 1
(2008) 176–187.
date_created: 2022-08-16T13:10:11Z
date_published: 2008-08-01T00:00:00Z
date_updated: 2023-02-17T13:55:24Z
day: '01'
doi: 10.14778/1453856.1453880
extern: '1'
intvolume: ' 1'
issue: '1'
language:
- iso: eng
month: '08'
oa_version: None
page: 176-187
publication: Proceedings of the VLDB Endowment
publication_identifier:
issn:
- 2150-8097
publication_status: published
publisher: Association for Computing Machinery
quality_controlled: '1'
scopus_import: '1'
status: public
title: Web page language identification based on URLs
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 1
year: '2008'
...
---
_id: '12656'
abstract:
- lang: eng
text: We use meteorological data from two automatic weather stations (AWS) on Juncal
Norte Glacier, central Chile, to investigate the glacier–climate interaction and
to test ablation models of different complexity. The semi-arid Central Andes are
characterized by dry summers, with precipitation close to zero, low relative humidity
and intense solar radiation. We show that katabatic forcing is dominant both on
the glacier tongue and in the fore field, and that low humidity and absence of
clouds cause strong radiative cooling of the glacier surface. Surface albedo is
basically constant for snow and ice, because of the scarcity of solid precipitation.
The energy balance of the glacier is simulated for a 2-month period in austral
summer using two models of different complexity, which differ in the inclusion
of the heat conduction flux into the snowpack and in the parameterization of the
incoming longwave radiation. Net shortwave radiation is the dominant component
of the energy balance. The sensible heat flux is always positive, while both the
net longwave radiation and latent heat flux are negative. Neglecting the subsurface
heat flux and corresponding variations in surface temperature leads to an overestimation
of ablation of 2% over a total of 3695 mm water equivalent (w.e.) at the end of
the season. Correct modelling of incoming longwave radiation is crucial, and we
suggest that parameterizations based on vapour pressure and air temperature should
be used rather than on computed cloud amount. We also used an enhanced temperature-index
model incorporating the shortwave radiation flux, which has two empirical parameters.
We apply it both with values of parameters obtained for Alpine glaciers and recalibrated
on Juncal Norte. The model recalibrated against the correct energy balance simulations
performs very well. The model parameters respond to the meteorological conditions
typical of this climatic setting.
article_processing_charge: No
article_type: original
author:
- first_name: Francesca
full_name: Pellicciotti, Francesca
id: b28f055a-81ea-11ed-b70c-a9fe7f7b0e70
last_name: Pellicciotti
- first_name: Jakob
full_name: Helbing, Jakob
last_name: Helbing
- first_name: Andrés
full_name: Rivera, Andrés
last_name: Rivera
- first_name: Vincent
full_name: Favier, Vincent
last_name: Favier
- first_name: Javier
full_name: Corripio, Javier
last_name: Corripio
- first_name: José
full_name: Araos, José
last_name: Araos
- first_name: Jean-Emmanuel
full_name: Sicart, Jean-Emmanuel
last_name: Sicart
- first_name: Marco
full_name: Carenzo, Marco
last_name: Carenzo
citation:
ama: Pellicciotti F, Helbing J, Rivera A, et al. A study of the energy balance and
melt regime on Juncal Norte Glacier, semi-arid Andes of central Chile, using melt
models of different complexity. Hydrological Processes. 2008;22(19):3980-3997.
doi:10.1002/hyp.7085
apa: Pellicciotti, F., Helbing, J., Rivera, A., Favier, V., Corripio, J., Araos,
J., … Carenzo, M. (2008). A study of the energy balance and melt regime on Juncal
Norte Glacier, semi-arid Andes of central Chile, using melt models of different
complexity. Hydrological Processes. Wiley. https://doi.org/10.1002/hyp.7085
chicago: Pellicciotti, Francesca, Jakob Helbing, Andrés Rivera, Vincent Favier,
Javier Corripio, José Araos, Jean-Emmanuel Sicart, and Marco Carenzo. “A Study
of the Energy Balance and Melt Regime on Juncal Norte Glacier, Semi-Arid Andes
of Central Chile, Using Melt Models of Different Complexity.” Hydrological
Processes. Wiley, 2008. https://doi.org/10.1002/hyp.7085.
ieee: F. Pellicciotti et al., “A study of the energy balance and melt regime
on Juncal Norte Glacier, semi-arid Andes of central Chile, using melt models of
different complexity,” Hydrological Processes, vol. 22, no. 19. Wiley,
pp. 3980–3997, 2008.
ista: Pellicciotti F, Helbing J, Rivera A, Favier V, Corripio J, Araos J, Sicart
J-E, Carenzo M. 2008. A study of the energy balance and melt regime on Juncal
Norte Glacier, semi-arid Andes of central Chile, using melt models of different
complexity. Hydrological Processes. 22(19), 3980–3997.
mla: Pellicciotti, Francesca, et al. “A Study of the Energy Balance and Melt Regime
on Juncal Norte Glacier, Semi-Arid Andes of Central Chile, Using Melt Models of
Different Complexity.” Hydrological Processes, vol. 22, no. 19, Wiley,
2008, pp. 3980–97, doi:10.1002/hyp.7085.
short: F. Pellicciotti, J. Helbing, A. Rivera, V. Favier, J. Corripio, J. Araos,
J.-E. Sicart, M. Carenzo, Hydrological Processes 22 (2008) 3980–3997.
date_created: 2023-02-20T08:18:45Z
date_published: 2008-09-15T00:00:00Z
date_updated: 2023-02-20T08:48:33Z
day: '15'
doi: 10.1002/hyp.7085
extern: '1'
intvolume: ' 22'
issue: '19'
keyword:
- Water Science and Technology
language:
- iso: eng
month: '09'
oa_version: None
page: 3980-3997
publication: Hydrological Processes
publication_identifier:
eissn:
- 1099-1085
issn:
- 0885-6087
publication_status: published
publisher: Wiley
quality_controlled: '1'
scopus_import: '1'
status: public
title: A study of the energy balance and melt regime on Juncal Norte Glacier, semi-arid
Andes of central Chile, using melt models of different complexity
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 22
year: '2008'
...
---
_id: '1296'
abstract:
- lang: eng
text: The crystalline-like structure of the optic lobes of the fruit fly Drosophila
melanogaster has made them a model system for the study of neuronal cell-fate
determination, axonal path finding, and target selection. For functional studies,
however, the small size of the constituting visual interneurons has so far presented
a formidable barrier. We have overcome this problem by establishing in vivo whole-cell
recordings [1] from genetically targeted visual interneurons of Drosophila. Here,
we describe the response properties of six motion-sensitive large-field neurons
in the lobula plate that form a network consisting of individually identifiable,
directionally selective cells most sensitive to vertical image motion (VS cells
[2, 3]). Individual VS cell responses to visual motion stimuli exhibit all the
characteristics that are indicative of presynaptic input from elementary motion
detectors of the correlation type [4, 5]. Different VS cells possess distinct
receptive fields that are arranged sequentially along the eye's azimuth, corresponding
to their characteristic cellular morphology and position within the retinotopically
organized lobula plate. In addition, lateral connections between individual VS
cells cause strongly overlapping receptive fields that are wider than expected
from their dendritic input. Our results suggest that motion vision in different
dipteran fly species is accomplished in similar circuitries and according to common
algorithmic rules. The underlying neural mechanisms of population coding within
the VS cell network and of elementary motion detection, respectively, can now
be analyzed by the combination of electrophysiology and genetic intervention in
Drosophila.
acknowledgement: This work was supported by the Max-Planck-Society and by a Human
Frontier Science Program (HFSP) grant to K. Ito, A.B., and B. Nelson.
author:
- first_name: Maximilian A
full_name: Maximilian Jösch
id: 2BD278E6-F248-11E8-B48F-1D18A9856A87
last_name: Jösch
orcid: 0000-0002-3937-1330
- first_name: Johannes
full_name: Plett, Johannes
last_name: Plett
- first_name: Alexander
full_name: Borst, Alexander
last_name: Borst
- first_name: Dierk
full_name: Reiff, Dierk F
last_name: Reiff
citation:
ama: Jösch MA, Plett J, Borst A, Reiff D. Response properties of motion sensitive
visual interneurons in the Lobula plate of Drosophila melanogaster. Current
Biology. 2008;18(5):368-374. doi:10.1016/j.cub.2008.02.022
apa: Jösch, M. A., Plett, J., Borst, A., & Reiff, D. (2008). Response properties
of motion sensitive visual interneurons in the Lobula plate of Drosophila melanogaster.
Current Biology. Cell Press. https://doi.org/10.1016/j.cub.2008.02.022
chicago: Jösch, Maximilian A, Johannes Plett, Alexander Borst, and Dierk Reiff.
“Response Properties of Motion Sensitive Visual Interneurons in the Lobula Plate
of Drosophila Melanogaster.” Current Biology. Cell Press, 2008. https://doi.org/10.1016/j.cub.2008.02.022.
ieee: M. A. Jösch, J. Plett, A. Borst, and D. Reiff, “Response properties of motion
sensitive visual interneurons in the Lobula plate of Drosophila melanogaster,”
Current Biology, vol. 18, no. 5. Cell Press, pp. 368–374, 2008.
ista: Jösch MA, Plett J, Borst A, Reiff D. 2008. Response properties of motion sensitive
visual interneurons in the Lobula plate of Drosophila melanogaster. Current Biology.
18(5), 368–374.
mla: Jösch, Maximilian A., et al. “Response Properties of Motion Sensitive Visual
Interneurons in the Lobula Plate of Drosophila Melanogaster.” Current Biology,
vol. 18, no. 5, Cell Press, 2008, pp. 368–74, doi:10.1016/j.cub.2008.02.022.
short: M.A. Jösch, J. Plett, A. Borst, D. Reiff, Current Biology 18 (2008) 368–374.
date_created: 2018-12-11T11:51:13Z
date_published: 2008-03-11T00:00:00Z
date_updated: 2021-01-12T06:49:42Z
day: '11'
doi: 10.1016/j.cub.2008.02.022
extern: 1
intvolume: ' 18'
issue: '5'
month: '03'
page: 368 - 374
publication: Current Biology
publication_status: published
publisher: Cell Press
publist_id: '5973'
quality_controlled: 0
status: public
title: Response properties of motion sensitive visual interneurons in the Lobula plate
of Drosophila melanogaster
type: journal_article
volume: 18
year: '2008'
...
---
_id: '3409'
abstract:
- lang: eng
text: With the introduction of single-molecule force spectroscopy (SMFS) it has
become possible to directly access the interactions of various molecular systems.
A bottleneck in conventional SMFS is collecting the large amount of data required
for statistically meaningful analysis. Currently, atomic force microscopy (AFM)-based
SMFS requires the user to tediously 'fish' for single molecules. In addition,
most experimental and environmental conditions must be manually adjusted. Here,
we developed a fully automated single-molecule force spectroscope. The instrument
is able to perform SMFS while monitoring and regulating experimental conditions
such as buffer composition and temperature. Cantilever alignment and calibration
can also be automatically performed during experiments. This, combined with in-line
data analysis, enables the instrument, once set up, to perform complete SMFS experiments
autonomously.
author:
- first_name: Jens
full_name: Struckmeier, Jens
last_name: Struckmeier
- first_name: Reiner
full_name: Wahl, Reiner
last_name: Wahl
- first_name: Mirko
full_name: Leuschner, Mirko
last_name: Leuschner
- first_name: Joao
full_name: Nunes, Joao
last_name: Nunes
- first_name: Harald L
full_name: Harald Janovjak
id: 33BA6C30-F248-11E8-B48F-1D18A9856A87
last_name: Janovjak
orcid: 0000-0002-8023-9315
- first_name: Ulrich
full_name: Geisler, Ulrich
last_name: Geisler
- first_name: Gerd
full_name: Hofmann, Gerd
last_name: Hofmann
- first_name: Torsten
full_name: Jähnke, Torsten
last_name: Jähnke
- first_name: Daniel
full_name: Mueller, Daniel J
last_name: Mueller
citation:
ama: Struckmeier J, Wahl R, Leuschner M, et al. Fully automated single-molecule
force spectroscopy for screening applications. Nanotechnology. 2008;19(38).
doi:10.1088/0957-4484/19/38/384020
apa: Struckmeier, J., Wahl, R., Leuschner, M., Nunes, J., Janovjak, H. L., Geisler,
U., … Mueller, D. (2008). Fully automated single-molecule force spectroscopy for
screening applications. Nanotechnology. IOP Publishing Ltd. https://doi.org/10.1088/0957-4484/19/38/384020
chicago: Struckmeier, Jens, Reiner Wahl, Mirko Leuschner, Joao Nunes, Harald L Janovjak,
Ulrich Geisler, Gerd Hofmann, Torsten Jähnke, and Daniel Mueller. “Fully Automated
Single-Molecule Force Spectroscopy for Screening Applications.” Nanotechnology.
IOP Publishing Ltd., 2008. https://doi.org/10.1088/0957-4484/19/38/384020.
ieee: J. Struckmeier et al., “Fully automated single-molecule force spectroscopy
for screening applications,” Nanotechnology, vol. 19, no. 38. IOP Publishing
Ltd., 2008.
ista: Struckmeier J, Wahl R, Leuschner M, Nunes J, Janovjak HL, Geisler U, Hofmann
G, Jähnke T, Mueller D. 2008. Fully automated single-molecule force spectroscopy
for screening applications. Nanotechnology. 19(38).
mla: Struckmeier, Jens, et al. “Fully Automated Single-Molecule Force Spectroscopy
for Screening Applications.” Nanotechnology, vol. 19, no. 38, IOP Publishing
Ltd., 2008, doi:10.1088/0957-4484/19/38/384020.
short: J. Struckmeier, R. Wahl, M. Leuschner, J. Nunes, H.L. Janovjak, U. Geisler,
G. Hofmann, T. Jähnke, D. Mueller, Nanotechnology 19 (2008).
date_created: 2018-12-11T12:03:11Z
date_published: 2008-08-12T00:00:00Z
date_updated: 2021-01-12T07:43:17Z
day: '12'
doi: 10.1088/0957-4484/19/38/384020
extern: 1
intvolume: ' 19'
issue: '38'
month: '08'
publication: Nanotechnology
publication_status: published
publisher: IOP Publishing Ltd.
publist_id: '2993'
quality_controlled: 0
status: public
title: Fully automated single-molecule force spectroscopy for screening applications
type: journal_article
volume: 19
year: '2008'
...
---
_id: '3410'
abstract:
- lang: eng
text: Membrane proteins are involved in essential biological processes such as energy
conversion, signal transduction, solute transport and secretion. All biological
processes, also those involving membrane proteins, are steered by molecular interactions.
Molecular interactions guide the folding and stability of membrane proteins, determine
their assembly, switch their functional states or mediate signal transduction.
The sequential steps of molecular interactions driving these processes can be
described by dynamic energy landscapes. The conceptual energy landscape allows
to follow the complex reaction pathways of membrane proteins while its modifications
describe why and how pathways are changed. Single-molecule force spectroscopy
(SMFS) detects, quantifies and locates interactions within and between membrane
proteins. SMFS helps to determine how these interactions change with temperature,
point mutations, oligomerization and the functional states of membrane proteins.
Applied in different modes, SMFS explores the co-existence and population of reaction
pathways in the energy landscape of the protein and thus reveals detailed insights
into local mechanisms, determining its structural and functional relationships.
Here we review how SMFS extracts the defining parameters of an energy landscape
such as the barrier position, reaction kinetics and roughness with high precision.
author:
- first_name: Harald L
full_name: Harald Janovjak
id: 33BA6C30-F248-11E8-B48F-1D18A9856A87
last_name: Janovjak
orcid: 0000-0002-8023-9315
- first_name: Tanuj
full_name: Sapra, Tanuj K
last_name: Sapra
- first_name: Alexej
full_name: Kedrov, Alexej
last_name: Kedrov
- first_name: Daniel
full_name: Mueller, Daniel J
last_name: Mueller
citation:
ama: 'Janovjak HL, Sapra T, Kedrov A, Mueller D. From valleys to ridges: Exploring
the energy landscape of single membrane proteins. ChemPhysChem. 2008;9(7):954-966.
doi:10.1002/cphc.200700662'
apa: 'Janovjak, H. L., Sapra, T., Kedrov, A., & Mueller, D. (2008). From valleys
to ridges: Exploring the energy landscape of single membrane proteins. ChemPhysChem.
Wiley-Blackwell. https://doi.org/10.1002/cphc.200700662'
chicago: 'Janovjak, Harald L, Tanuj Sapra, Alexej Kedrov, and Daniel Mueller. “From
Valleys to Ridges: Exploring the Energy Landscape of Single Membrane Proteins.”
ChemPhysChem. Wiley-Blackwell, 2008. https://doi.org/10.1002/cphc.200700662.'
ieee: 'H. L. Janovjak, T. Sapra, A. Kedrov, and D. Mueller, “From valleys to ridges:
Exploring the energy landscape of single membrane proteins,” ChemPhysChem,
vol. 9, no. 7. Wiley-Blackwell, pp. 954–966, 2008.'
ista: 'Janovjak HL, Sapra T, Kedrov A, Mueller D. 2008. From valleys to ridges:
Exploring the energy landscape of single membrane proteins. ChemPhysChem. 9(7),
954–966.'
mla: 'Janovjak, Harald L., et al. “From Valleys to Ridges: Exploring the Energy
Landscape of Single Membrane Proteins.” ChemPhysChem, vol. 9, no. 7, Wiley-Blackwell,
2008, pp. 954–66, doi:10.1002/cphc.200700662.'
short: H.L. Janovjak, T. Sapra, A. Kedrov, D. Mueller, ChemPhysChem 9 (2008) 954–966.
date_created: 2018-12-11T12:03:11Z
date_published: 2008-05-02T00:00:00Z
date_updated: 2019-04-26T07:22:27Z
day: '02'
doi: 10.1002/cphc.200700662
extern: 1
intvolume: ' 9'
issue: '7'
month: '05'
page: 954 - 966
publication: ChemPhysChem
publication_status: published
publisher: Wiley-Blackwell
publist_id: '2992'
quality_controlled: 0
status: public
title: 'From valleys to ridges: Exploring the energy landscape of single membrane
proteins'
type: review
volume: 9
year: '2008'
...
---
_id: '3435'
abstract:
- lang: eng
text: We develop a new method for estimating effective population sizes, Ne, and
selection coefficients, s, from time-series data of allele frequencies sampled
from a single diallelic locus. The method is based on calculating transition probabilities,
using a numerical solution of the diffusion process, and assuming independent
binomial sampling from this diffusion process at each time point. We apply the
method in two example applications. First, we estimate selection coefficients
acting on the CCR5-Δ32 mutation on the basis of published samples of contemporary
and ancient human DNA. We show that the data are compatible with the assumption
of s = 0, although moderate amounts of selection acting on this mutation cannot
be excluded. In our second example, we estimate the selection coefficient acting
on a mutation segregating in an experimental phage population. We show that the
selection coefficient acting on this mutation is ~0.43.
author:
- first_name: Jonathan P
full_name: Jonathan Bollback
id: 2C6FA9CC-F248-11E8-B48F-1D18A9856A87
last_name: Bollback
orcid: 0000-0002-4624-4612
- first_name: Thomas
full_name: York, Thomas L
last_name: York
- first_name: Rasmus
full_name: Nielsen, Rasmus
last_name: Nielsen
citation:
ama: Bollback JP, York T, Nielsen R. Estimation of 2Nes From Temporal Allele Frequency
Data. Genetics. 2008;179(1):497-502. doi:10.1534/genetics.107.085019
apa: Bollback, J. P., York, T., & Nielsen, R. (2008). Estimation of 2Nes From
Temporal Allele Frequency Data. Genetics. Genetics Society of America.
https://doi.org/10.1534/genetics.107.085019
chicago: Bollback, Jonathan P, Thomas York, and Rasmus Nielsen. “Estimation of 2Nes
From Temporal Allele Frequency Data.” Genetics. Genetics Society of America,
2008. https://doi.org/10.1534/genetics.107.085019.
ieee: J. P. Bollback, T. York, and R. Nielsen, “Estimation of 2Nes From Temporal
Allele Frequency Data,” Genetics, vol. 179, no. 1. Genetics Society of
America, pp. 497–502, 2008.
ista: Bollback JP, York T, Nielsen R. 2008. Estimation of 2Nes From Temporal Allele
Frequency Data. Genetics. 179(1), 497–502.
mla: Bollback, Jonathan P., et al. “Estimation of 2Nes From Temporal Allele Frequency
Data.” Genetics, vol. 179, no. 1, Genetics Society of America, 2008, pp.
497–502, doi:10.1534/genetics.107.085019.
short: J.P. Bollback, T. York, R. Nielsen, Genetics 179 (2008) 497–502.
date_created: 2018-12-11T12:03:19Z
date_published: 2008-05-01T00:00:00Z
date_updated: 2021-01-12T07:43:27Z
day: '01'
doi: 10.1534/genetics.107.085019
extern: 1
intvolume: ' 179'
issue: '1'
main_file_link:
- open_access: '1'
url: http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2390626
month: '05'
oa: 1
page: 497 - 502
publication: Genetics
publication_status: published
publisher: Genetics Society of America
publist_id: '2965'
quality_controlled: 0
status: public
title: Estimation of 2Nes From Temporal Allele Frequency Data
type: journal_article
volume: 179
year: '2008'
...
---
_id: '3501'
abstract:
- lang: eng
text: |-
The Wikipedia is a collaborative encyclopedia: anyone can contribute to its articles simply by clicking on an "edit" button. The open nature of the Wikipedia has been key to its success, but has also created a challenge: how can readers develop an informed opinion on its reliability? We propose a system that computes quantitative values of trust for the text in Wikipedia articles; these trust values provide an indication of text reliability.
The system uses as input the revision history of each article, as well as information about the reputation of the contributing authors, as provided by a reputation system. The trust of a word in an article is computed on the basis of the reputation of the original author of the word, as well as the reputation of all authors who edited text near the word. The algorithm computes word trust values that vary smoothly across the text; the trust values can be visualized using varying text-background colors. The algorithm ensures that all changes to an article's text are reflected in the trust values, preventing surreptitious content changes.
We have implemented the proposed system, and we have used it to compute and display the trust of the text of thousands of articles of the English Wikipedia. To validate our trust-computation algorithms, we show that text labeled as low-trust has a significantly higher probability of being edited in the future than text labeled as high-trust.
acknowledgement: 'This research has been partially supported by the CITRIS: Center
for Information Technology Research in the Interest of Society.'
author:
- first_name: B Thomas
full_name: Adler, B Thomas
last_name: Adler
- first_name: Krishnendu
full_name: Krishnendu Chatterjee
id: 2E5DCA20-F248-11E8-B48F-1D18A9856A87
last_name: Chatterjee
orcid: 0000-0002-4561-241X
- first_name: Luca
full_name: de Alfaro, Luca
last_name: De Alfaro
- first_name: Marco
full_name: Faella, Marco
last_name: Faella
- first_name: Ian
full_name: Pye, Ian
last_name: Pye
- first_name: Vishwanath
full_name: Raman, Vishwanath
last_name: Raman
citation:
ama: 'Adler BT, Chatterjee K, De Alfaro L, Faella M, Pye I, Raman V. Assigning trust
to Wikipedia content. In: ACM; 2008. doi:10.1145/1822258.1822293'
apa: 'Adler, B. T., Chatterjee, K., De Alfaro, L., Faella, M., Pye, I., & Raman,
V. (2008). Assigning trust to Wikipedia content. Presented at the WikiSym: International
Symposium on Wikis, ACM. https://doi.org/10.1145/1822258.1822293'
chicago: Adler, B Thomas, Krishnendu Chatterjee, Luca De Alfaro, Marco Faella, Ian
Pye, and Vishwanath Raman. “Assigning Trust to Wikipedia Content.” ACM, 2008.
https://doi.org/10.1145/1822258.1822293.
ieee: 'B. T. Adler, K. Chatterjee, L. De Alfaro, M. Faella, I. Pye, and V. Raman,
“Assigning trust to Wikipedia content,” presented at the WikiSym: International
Symposium on Wikis, 2008.'
ista: 'Adler BT, Chatterjee K, De Alfaro L, Faella M, Pye I, Raman V. 2008. Assigning
trust to Wikipedia content. WikiSym: International Symposium on Wikis.'
mla: Adler, B. Thomas, et al. Assigning Trust to Wikipedia Content. ACM,
2008, doi:10.1145/1822258.1822293.
short: B.T. Adler, K. Chatterjee, L. De Alfaro, M. Faella, I. Pye, V. Raman, in:,
ACM, 2008.
conference:
name: 'WikiSym: International Symposium on Wikis'
date_created: 2018-12-11T12:03:40Z
date_published: 2008-09-10T00:00:00Z
date_updated: 2021-01-12T07:43:53Z
day: '10'
doi: 10.1145/1822258.1822293
extern: 1
month: '09'
publication_status: published
publisher: ACM
publist_id: '2886'
quality_controlled: 0
status: public
title: Assigning trust to Wikipedia content
type: conference
year: '2008'
...
---
_id: '3502'
abstract:
- lang: eng
text: 'In content-driven reputation systems for collaborative content, users gain
or lose reputation according to how their contributions fare: authors of long-lived
contributions gain reputation, while authors of reverted contributions lose reputation.
Existing content-driven systems are prone to Sybil attacks, in which multiple
identities, controlled by the same person, perform coordinated actions to increase
their reputation. We show that content-driven reputation systems can be made resistant
to such attacks by taking advantage of thefact that the reputation increments
and decrements depend on content modifications, which are visible to all. We present
an algorithm for content-driven reputation that prevents a set of identities from
increasing their maximum reputation without doing any useful work. Here, work
is considered useful if it causes content to evolve in a direction that is consistent
with the actions of high-reputation users. We argue that the content modifications
that require no effort, such as the insertion or deletion of arbitrary text, are
invariably non-useful. We prove a truthfullness result for the resulting system,
stating that users who wish to perform a contribution do not gain by employing
complex contribution schemes, compared to simply performing the contribution at
once. In particular, splitting the contribution in multiple portions, or employing
the coordinated actions of multiple identities, do not yield additional reputation.
Taken together, these results indicate that content-driven systems can be made
robust with respect to Sybil attacks. Copyright 2008 ACM.'
acknowledgement: 'This research has been partially supported by the CITRIS: Center
for Information Technology Research in the Interest of Society.'
author:
- first_name: Krishnendu
full_name: Krishnendu Chatterjee
id: 2E5DCA20-F248-11E8-B48F-1D18A9856A87
last_name: Chatterjee
orcid: 0000-0002-4561-241X
- first_name: Luca
full_name: de Alfaro, Luca
last_name: De Alfaro
- first_name: Ian
full_name: Pye, Ian
last_name: Pye
citation:
ama: 'Chatterjee K, De Alfaro L, Pye I. Robust content-driven reputation. In: ACM;
2008:33-42. doi:10.1145/1456377.1456387
'
apa: 'Chatterjee, K., De Alfaro, L., & Pye, I. (2008). Robust content-driven
reputation (pp. 33–42). Presented at the AISec: Artificial Intelligence and Security,
ACM. https://doi.org/10.1145/1456377.1456387
'
chicago: Chatterjee, Krishnendu, Luca De Alfaro, and Ian Pye. “Robust Content-Driven
Reputation,” 33–42. ACM, 2008. https://doi.org/10.1145/1456377.1456387 .
ieee: 'K. Chatterjee, L. De Alfaro, and I. Pye, “Robust content-driven reputation,”
presented at the AISec: Artificial Intelligence and Security, 2008, pp. 33–42.'
ista: 'Chatterjee K, De Alfaro L, Pye I. 2008. Robust content-driven reputation.
AISec: Artificial Intelligence and Security, 33–42.'
mla: Chatterjee, Krishnendu, et al. Robust Content-Driven Reputation. ACM,
2008, pp. 33–42, doi:10.1145/1456377.1456387
.
short: K. Chatterjee, L. De Alfaro, I. Pye, in:, ACM, 2008, pp. 33–42.
conference:
name: 'AISec: Artificial Intelligence and Security'
date_created: 2018-12-11T12:03:40Z
date_published: 2008-10-31T00:00:00Z
date_updated: 2021-01-12T07:43:54Z
day: '31'
doi: '10.1145/1456377.1456387 '
extern: 1
month: '10'
page: 33 - 42
publication_status: published
publisher: ACM
publist_id: '2885'
quality_controlled: 0
status: public
title: Robust content-driven reputation
type: conference
year: '2008'
...
---
_id: '3504'
abstract:
- lang: eng
text: "Simulation and bisimulation metrics for stochastic systems provide a quantitative
gen- eralization of the classical simulation and bisimulation relations. These
metrics capture the similarity of states with respect to quantitative specifications
written in the quantitative μ-calculus and related probabilistic logics.\r\nWe
present algorithms for computing the metrics on Markov decision processes (MDPs),
turn- based stochastic games, and concurrent games. For turn-based games and MDPs,
we provide a polynomial-time algorithm based on linear programming for the computation
of the one-step metric distance between states. The algorithm improves on the
previously known exponential-time algo- rithm based on a reduction to the theory
of reals. We then present PSPACE algorithms for both the decision problem and
the problem of approximating the metric distance between two states, matching
the best known bound for Markov chains. For the bisimulation kernel of the metric,
which corresponds to probabilistic bisimulation, our algorithm works in time O(n4)
for both turn-based games and MDPs; improving the previously best known O(n9 ·
log(n)) time algorithm for MDPs. For a concurrent game G, we show that computing
the exact distance between states is at least as hard as computing the value of
concurrent reachability games and the square-root-sum problem in computational
geometry. We show that checking whether the metric distance is bounded by a rational
r, can be accomplished via a reduction to the theory of real closed fields, involving
a\r\nformula with three quantifier alternations, yielding O(|G|O(|G|5)) time complexity,
improving the previously known reduction with O(|G|O(|G|7)) time complexity. These
algorithms can be iterated\r\nto approximate the metrics using binary search."
acknowledgement: This research was supported in part by the NSF grants CCR-0132780
and CNS-0720884.
alternative_title:
- LIPIcs
author:
- first_name: Krishnendu
full_name: Chatterjee, Krishnendu
id: 2E5DCA20-F248-11E8-B48F-1D18A9856A87
last_name: Chatterjee
orcid: 0000-0002-4561-241X
- first_name: Luca
full_name: De Alfaro, Luca
last_name: De Alfaro
- first_name: Ritankar
full_name: Majumdar, Ritankar
last_name: Majumdar
- first_name: Vishwanath
full_name: Raman, Vishwanath
last_name: Raman
citation:
ama: 'Chatterjee K, De Alfaro L, Majumdar R, Raman V. Algorithms for game metrics.
In: Vol 2. Schloss Dagstuhl - Leibniz-Zentrum für Informatik; 2008:107-118. doi:10.4230/LIPIcs.FSTTCS.2008.1745'
apa: 'Chatterjee, K., De Alfaro, L., Majumdar, R., & Raman, V. (2008). Algorithms
for game metrics (Vol. 2, pp. 107–118). Presented at the FSTTCS: Foundations of
Software Technology and Theoretical Computer Science, Schloss Dagstuhl - Leibniz-Zentrum
für Informatik. https://doi.org/10.4230/LIPIcs.FSTTCS.2008.1745'
chicago: Chatterjee, Krishnendu, Luca De Alfaro, Ritankar Majumdar, and Vishwanath
Raman. “Algorithms for Game Metrics,” 2:107–18. Schloss Dagstuhl - Leibniz-Zentrum
für Informatik, 2008. https://doi.org/10.4230/LIPIcs.FSTTCS.2008.1745.
ieee: 'K. Chatterjee, L. De Alfaro, R. Majumdar, and V. Raman, “Algorithms for game
metrics,” presented at the FSTTCS: Foundations of Software Technology and Theoretical
Computer Science, 2008, vol. 2, pp. 107–118.'
ista: 'Chatterjee K, De Alfaro L, Majumdar R, Raman V. 2008. Algorithms for game
metrics. FSTTCS: Foundations of Software Technology and Theoretical Computer Science,
LIPIcs, vol. 2, 107–118.'
mla: Chatterjee, Krishnendu, et al. Algorithms for Game Metrics. Vol. 2,
Schloss Dagstuhl - Leibniz-Zentrum für Informatik, 2008, pp. 107–18, doi:10.4230/LIPIcs.FSTTCS.2008.1745.
short: K. Chatterjee, L. De Alfaro, R. Majumdar, V. Raman, in:, Schloss Dagstuhl
- Leibniz-Zentrum für Informatik, 2008, pp. 107–118.
conference:
name: 'FSTTCS: Foundations of Software Technology and Theoretical Computer Science'
date_created: 2018-12-11T12:03:40Z
date_published: 2008-12-05T00:00:00Z
date_updated: 2023-02-23T11:46:14Z
day: '05'
ddc:
- '000'
doi: 10.4230/LIPIcs.FSTTCS.2008.1745
extern: '1'
file:
- access_level: open_access
checksum: 0a447454a24e273f7ddf51dbfe47f877
content_type: application/pdf
creator: dernst
date_created: 2019-05-10T10:01:21Z
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file_name: 2008_LIPIcs_Chatterjee.pdf
file_size: 442139
relation: main_file
file_date_updated: 2020-07-14T12:46:12Z
has_accepted_license: '1'
intvolume: ' 2'
language:
- iso: eng
license: https://creativecommons.org/licenses/by-nc-nd/4.0/
month: '12'
oa: 1
oa_version: Published Version
page: 107 - 118
publication_status: published
publisher: Schloss Dagstuhl - Leibniz-Zentrum für Informatik
publist_id: '2883'
quality_controlled: '1'
related_material:
record:
- id: '3868'
relation: later_version
status: public
status: public
title: Algorithms for game metrics
tmp:
image: /images/cc_by_nc_nd.png
legal_code_url: https://creativecommons.org/licenses/by-nc-nd/4.0/legalcode
name: Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International
(CC BY-NC-ND 4.0)
short: CC BY-NC-ND (4.0)
type: conference
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 2
year: '2008'
...
---
_id: '3516'
abstract:
- lang: eng
text: Temporal coding is a means of representing information by the time, as opposed
to the rate, at which neurons fire. Evidence of temporal coding in the hippocampus
comes from place cells, whose spike times relative to theta oscillations reflect
a rat's position while running along stereotyped trajectories. This arises from
the backwards shift in cell firing relative to local theta oscillations (phase
precession). Here we demonstrate phase precession during place-field crossings
in an open-field foraging task. This produced spike sequences in each theta cycle
that disambiguate the rat's trajectory through two-dimensional space and can be
used to predict movement direction. Furthermore, position and movement direction
were maximally predicted from firing in the early and late portions of the theta
cycle, respectively. This represents the first direct evidence of a combined representation
of position, trajectory and heading in the hippocampus, organized on a fine temporal
scale by theta oscillations.
author:
- first_name: John
full_name: Huxter,John R
last_name: Huxter
- first_name: Timothy
full_name: Senior,Timothy J
last_name: Senior
- first_name: Kevin
full_name: Allen, Kevin
last_name: Allen
- first_name: Jozsef L
full_name: Jozsef Csicsvari
id: 3FA14672-F248-11E8-B48F-1D18A9856A87
last_name: Csicsvari
orcid: 0000-0002-5193-4036
citation:
ama: Huxter J, Senior T, Allen K, Csicsvari JL. Theta phase-specific codes for two-dimensional
position, trajectory and heading in the hippocampus. Nature Neuroscience.
2008;11(5):587-594. doi:10.1038/nn.2106
apa: Huxter, J., Senior, T., Allen, K., & Csicsvari, J. L. (2008). Theta phase-specific
codes for two-dimensional position, trajectory and heading in the hippocampus.
Nature Neuroscience. Nature Publishing Group. https://doi.org/10.1038/nn.2106
chicago: Huxter, John, Timothy Senior, Kevin Allen, and Jozsef L Csicsvari. “Theta
Phase-Specific Codes for Two-Dimensional Position, Trajectory and Heading in the
Hippocampus.” Nature Neuroscience. Nature Publishing Group, 2008. https://doi.org/10.1038/nn.2106.
ieee: J. Huxter, T. Senior, K. Allen, and J. L. Csicsvari, “Theta phase-specific
codes for two-dimensional position, trajectory and heading in the hippocampus,”
Nature Neuroscience, vol. 11, no. 5. Nature Publishing Group, pp. 587–594,
2008.
ista: Huxter J, Senior T, Allen K, Csicsvari JL. 2008. Theta phase-specific codes
for two-dimensional position, trajectory and heading in the hippocampus. Nature
Neuroscience. 11(5), 587–594.
mla: Huxter, John, et al. “Theta Phase-Specific Codes for Two-Dimensional Position,
Trajectory and Heading in the Hippocampus.” Nature Neuroscience, vol. 11,
no. 5, Nature Publishing Group, 2008, pp. 587–94, doi:10.1038/nn.2106.
short: J. Huxter, T. Senior, K. Allen, J.L. Csicsvari, Nature Neuroscience 11 (2008)
587–594.
date_created: 2018-12-11T12:03:44Z
date_published: 2008-05-29T00:00:00Z
date_updated: 2021-01-12T07:44:00Z
day: '29'
doi: 10.1038/nn.2106
extern: 1
intvolume: ' 11'
issue: '5'
month: '05'
page: 587 - 594
publication: Nature Neuroscience
publication_status: published
publisher: Nature Publishing Group
publist_id: '2869'
quality_controlled: 0
status: public
title: Theta phase-specific codes for two-dimensional position, trajectory and heading
in the hippocampus
type: journal_article
volume: 11
year: '2008'
...
---
_id: '3520'
abstract:
- lang: eng
text: The hippocampus is thought to be involved in episodic memory formation by
reactivating traces of waking experience during sleep. Indeed, the joint firing
of spatially tuned pyramidal cells encoding nearby places recur during sleep.
We found that the sleep cofiring of rat CA1 pyramidal cells encoding similar places
increased relative to the sleep session before exploration. This cofiring increase
depended on the number of times that cells fired together with short latencies
( < 50 ms) during exploration, and was strongest between cells representing
the most visited places. This is indicative of a Hebbian learning rule in which
changes in firing associations between cells are determined by the number of waking
coincident firing events. In contrast, cells encoding different locations reduced
their cofiring in proportion to the number of times that they fired independently.
Together these data indicate that reactivated patterns are shaped by both positive
and negative changes in cofiring, which are determined by recent behavior.
author:
- first_name: Joseph
full_name: Joseph O'Neill
id: 426376DC-F248-11E8-B48F-1D18A9856A87
last_name: O'Neill
- first_name: Timothy
full_name: Senior,Timothy J
last_name: Senior
- first_name: Kevin
full_name: Allen, Kevin
last_name: Allen
- first_name: John
full_name: Huxter,John R
last_name: Huxter
- first_name: Jozsef L
full_name: Jozsef Csicsvari
id: 3FA14672-F248-11E8-B48F-1D18A9856A87
last_name: Csicsvari
orcid: 0000-0002-5193-4036
citation:
ama: O’Neill J, Senior T, Allen K, Huxter J, Csicsvari JL. Reactivation of experience-dependent
cell assembly patterns in the hippocampus. Nature Neuroscience. 2008;11(2):209-215.
doi:10.1038/nn2037
apa: O’Neill, J., Senior, T., Allen, K., Huxter, J., & Csicsvari, J. L. (2008).
Reactivation of experience-dependent cell assembly patterns in the hippocampus.
Nature Neuroscience. Nature Publishing Group. https://doi.org/10.1038/nn2037
chicago: O’Neill, Joseph, Timothy Senior, Kevin Allen, John Huxter, and Jozsef L
Csicsvari. “Reactivation of Experience-Dependent Cell Assembly Patterns in the
Hippocampus.” Nature Neuroscience. Nature Publishing Group, 2008. https://doi.org/10.1038/nn2037.
ieee: J. O’Neill, T. Senior, K. Allen, J. Huxter, and J. L. Csicsvari, “Reactivation
of experience-dependent cell assembly patterns in the hippocampus,” Nature
Neuroscience, vol. 11, no. 2. Nature Publishing Group, pp. 209–215, 2008.
ista: O’Neill J, Senior T, Allen K, Huxter J, Csicsvari JL. 2008. Reactivation of
experience-dependent cell assembly patterns in the hippocampus. Nature Neuroscience.
11(2), 209–215.
mla: O’Neill, Joseph, et al. “Reactivation of Experience-Dependent Cell Assembly
Patterns in the Hippocampus.” Nature Neuroscience, vol. 11, no. 2, Nature
Publishing Group, 2008, pp. 209–15, doi:10.1038/nn2037.
short: J. O’Neill, T. Senior, K. Allen, J. Huxter, J.L. Csicsvari, Nature Neuroscience
11 (2008) 209–215.
date_created: 2018-12-11T12:03:46Z
date_published: 2008-02-01T00:00:00Z
date_updated: 2021-01-12T07:44:02Z
day: '01'
doi: 10.1038/nn2037
extern: 1
intvolume: ' 11'
issue: '2'
month: '02'
page: 209 - 215
publication: Nature Neuroscience
publication_status: published
publisher: Nature Publishing Group
publist_id: '2864'
quality_controlled: 0
status: public
title: Reactivation of experience-dependent cell assembly patterns in the hippocampus
type: journal_article
volume: 11
year: '2008'
...
---
_id: '3530'
abstract:
- lang: eng
text: In the cerebral cortex, GABAergic interneurons are often regarded as fast-spiking
cells. We have identified a type of slow-spiking interneuron that offers distinct
contributions to network activity. “Ivy” cells, named after their dense and fine
axons innervating mostly basal and oblique pyramidal cell dendrites, are more
numerous than the parvalbumin-expressing basket, bistratified, or axo-axonic cells.
Ivy cells express nitric oxide synthase, neuropeptide Y, and high levels of GABA(A)
receptor alpha 1 subunit; they discharge at a low frequency with wide spikes in
vivo, yet are distinctively phase-locked to behaviorally relevant network rhythms
including theta, gamma, and ripple oscillations. Paired recordings in vitro showed
that Ivy cells receive depressing EPSPs from pyramidal cells, which in turn receive
slowly rising and decaying inhibitory input from Ivy cells. In contrast to fast-spiking
interneurons operating with millisecond precision, the highly abundant Ivy cells
express presynaptically acting neuromodulators and regulate the excitability of
pyramidal cell dendrites through slowly rising and decaying GABAergic inputs.
author:
- first_name: Pablo
full_name: Fuentealba,Pablo
last_name: Fuentealba
- first_name: Rahima
full_name: Begum,Rahima
last_name: Begum
- first_name: Marco
full_name: Capogna,Marco
last_name: Capogna
- first_name: Shozo
full_name: Jinno,Shozo
last_name: Jinno
- first_name: Laszlo
full_name: Marton,Laszlo F
last_name: Marton
- first_name: Jozsef L
full_name: Jozsef Csicsvari
id: 3FA14672-F248-11E8-B48F-1D18A9856A87
last_name: Csicsvari
orcid: 0000-0002-5193-4036
- first_name: Alex
full_name: Thomson,Alex
last_name: Thomson
- first_name: Péter
full_name: Somogyi, Péter
last_name: Somogyi
- first_name: Thomas
full_name: Klausberger,Thomas
last_name: Klausberger
citation:
ama: 'Fuentealba P, Begum R, Capogna M, et al. Ivy cells: A population of nitric-oxide-producing,
slow-spiking GABAergic neurons and their involvement in hippocampal network activity.
Neuron. 2008;57(6):917-929. doi:10.1016/j.neuron.2008.01.034'
apa: 'Fuentealba, P., Begum, R., Capogna, M., Jinno, S., Marton, L., Csicsvari,
J. L., … Klausberger, T. (2008). Ivy cells: A population of nitric-oxide-producing,
slow-spiking GABAergic neurons and their involvement in hippocampal network activity.
Neuron. Elsevier. https://doi.org/10.1016/j.neuron.2008.01.034'
chicago: 'Fuentealba, Pablo, Rahima Begum, Marco Capogna, Shozo Jinno, Laszlo Marton,
Jozsef L Csicsvari, Alex Thomson, Péter Somogyi, and Thomas Klausberger. “Ivy
Cells: A Population of Nitric-Oxide-Producing, Slow-Spiking GABAergic Neurons
and Their Involvement in Hippocampal Network Activity.” Neuron. Elsevier,
2008. https://doi.org/10.1016/j.neuron.2008.01.034.'
ieee: 'P. Fuentealba et al., “Ivy cells: A population of nitric-oxide-producing,
slow-spiking GABAergic neurons and their involvement in hippocampal network activity,”
Neuron, vol. 57, no. 6. Elsevier, pp. 917–929, 2008.'
ista: 'Fuentealba P, Begum R, Capogna M, Jinno S, Marton L, Csicsvari JL, Thomson
A, Somogyi P, Klausberger T. 2008. Ivy cells: A population of nitric-oxide-producing,
slow-spiking GABAergic neurons and their involvement in hippocampal network activity.
Neuron. 57(6), 917–929.'
mla: 'Fuentealba, Pablo, et al. “Ivy Cells: A Population of Nitric-Oxide-Producing,
Slow-Spiking GABAergic Neurons and Their Involvement in Hippocampal Network Activity.”
Neuron, vol. 57, no. 6, Elsevier, 2008, pp. 917–29, doi:10.1016/j.neuron.2008.01.034.'
short: P. Fuentealba, R. Begum, M. Capogna, S. Jinno, L. Marton, J.L. Csicsvari,
A. Thomson, P. Somogyi, T. Klausberger, Neuron 57 (2008) 917–929.
date_created: 2018-12-11T12:03:49Z
date_published: 2008-03-27T00:00:00Z
date_updated: 2021-01-12T07:44:06Z
day: '27'
doi: 10.1016/j.neuron.2008.01.034
extern: 1
intvolume: ' 57'
issue: '6'
month: '03'
page: 917 - 929
publication: Neuron
publication_status: published
publisher: Elsevier
publist_id: '2855'
quality_controlled: 0
status: public
title: 'Ivy cells: A population of nitric-oxide-producing, slow-spiking GABAergic
neurons and their involvement in hippocampal network activity'
type: journal_article
volume: 57
year: '2008'
...
---
_id: '3534'
author:
- first_name: David
full_name: Dupret, David
last_name: Dupret
- first_name: Barty
full_name: Pleydell-Bouverie, Barty
last_name: Pleydell Bouverie
- first_name: Jozsef L
full_name: Jozsef Csicsvari
id: 3FA14672-F248-11E8-B48F-1D18A9856A87
last_name: Csicsvari
orcid: 0000-0002-5193-4036
citation:
ama: Dupret D, Pleydell Bouverie B, Csicsvari JL. Inhibitory interneurons and network
oscillations. PNAS. 2008;105(47):18079-18080. doi:10.1073/pnas.0810064105
apa: Dupret, D., Pleydell Bouverie, B., & Csicsvari, J. L. (2008). Inhibitory
interneurons and network oscillations. PNAS. National Academy of Sciences.
https://doi.org/10.1073/pnas.0810064105
chicago: Dupret, David, Barty Pleydell Bouverie, and Jozsef L Csicsvari. “Inhibitory
Interneurons and Network Oscillations.” PNAS. National Academy of Sciences,
2008. https://doi.org/10.1073/pnas.0810064105.
ieee: D. Dupret, B. Pleydell Bouverie, and J. L. Csicsvari, “Inhibitory interneurons
and network oscillations,” PNAS, vol. 105, no. 47. National Academy of
Sciences, pp. 18079–18080, 2008.
ista: Dupret D, Pleydell Bouverie B, Csicsvari JL. 2008. Inhibitory interneurons
and network oscillations. PNAS. 105(47), 18079–18080.
mla: Dupret, David, et al. “Inhibitory Interneurons and Network Oscillations.” PNAS,
vol. 105, no. 47, National Academy of Sciences, 2008, pp. 18079–80, doi:10.1073/pnas.0810064105.
short: D. Dupret, B. Pleydell Bouverie, J.L. Csicsvari, PNAS 105 (2008) 18079–18080.
date_created: 2018-12-11T12:03:50Z
date_published: 2008-11-25T00:00:00Z
date_updated: 2021-01-12T07:44:08Z
day: '25'
doi: 10.1073/pnas.0810064105
extern: 1
intvolume: ' 105'
issue: '47'
month: '11'
page: 18079 - 18080
publication: PNAS
publication_status: published
publisher: National Academy of Sciences
publist_id: '2852'
quality_controlled: 0
status: public
title: Inhibitory interneurons and network oscillations
type: journal_article
volume: 105
year: '2008'
...
---
_id: '3537'
abstract:
- lang: eng
text: 'Hippocampal place cells that fire together within the same cycle of theta
oscillations represent the sequence of positions (movement trajectory) that a
rat traverses on a linear track. Furthermore, it has been suggested that the encoding
of these and other types of temporal memory sequences is organized by gamma oscillations
nested within theta oscillations. Here, we examined whether gamma-related firing
of place cells permits such discrete temporal coding. We found that gamma-modulated
CA1 pyramidal cells separated into two classes on the basis of gamma firing phases
during waking theta periods. These groups also differed in terms of their spike
waveforms, firing rates, and burst firing tendency. During gamma oscillations
one group''s firing became restricted to theta phases associated with the highest
gamma power. Consequently, on the linear track, cells in this group often failed
to fire early in theta-phase precession (as the rat entered the place field) if
gamma oscillations were present. The second group fired throughout the theta cycle
during gamma oscillations, and maintained gamma-modulated firing at different
stages of theta-phase precession. Our results suggest that the two different pyramidal
cell classes may support different types of population codes within a theta cycle:
one in which spike sequences representing movement trajectories occur across subsequent
gamma cycles nested within each theta cycle, and another in which firing in synchronized
gamma discharges without temporal sequences encode a representation of location.
We propose that gamma oscillations during theta-phase precession organize the
mnemonic recall of population patterns representing places and movement paths.'
author:
- first_name: Timothy
full_name: Senior,Timothy J
last_name: Senior
- first_name: John
full_name: Huxter,John R
last_name: Huxter
- first_name: Kevin
full_name: Allen, Kevin
last_name: Allen
- first_name: Joseph
full_name: Joseph O'Neill
id: 426376DC-F248-11E8-B48F-1D18A9856A87
last_name: O'Neill
- first_name: Jozsef L
full_name: Jozsef Csicsvari
id: 3FA14672-F248-11E8-B48F-1D18A9856A87
last_name: Csicsvari
orcid: 0000-0002-5193-4036
citation:
ama: Senior T, Huxter J, Allen K, O’Neill J, Csicsvari JL. Gamma oscillatory firing
reveals distinct populations of pyramidal cells in the CA1 region of the hippocampus.
Journal of Neuroscience. 2008;28(9):2274-2286. doi:10.1523/JNEUROSCI.4669-07.2008
apa: Senior, T., Huxter, J., Allen, K., O’Neill, J., & Csicsvari, J. L. (2008).
Gamma oscillatory firing reveals distinct populations of pyramidal cells in the
CA1 region of the hippocampus. Journal of Neuroscience. Society for Neuroscience.
https://doi.org/10.1523/JNEUROSCI.4669-07.2008
chicago: Senior, Timothy, John Huxter, Kevin Allen, Joseph O’Neill, and Jozsef L
Csicsvari. “Gamma Oscillatory Firing Reveals Distinct Populations of Pyramidal
Cells in the CA1 Region of the Hippocampus.” Journal of Neuroscience. Society
for Neuroscience, 2008. https://doi.org/10.1523/JNEUROSCI.4669-07.2008.
ieee: T. Senior, J. Huxter, K. Allen, J. O’Neill, and J. L. Csicsvari, “Gamma oscillatory
firing reveals distinct populations of pyramidal cells in the CA1 region of the
hippocampus,” Journal of Neuroscience, vol. 28, no. 9. Society for Neuroscience,
pp. 2274–2286, 2008.
ista: Senior T, Huxter J, Allen K, O’Neill J, Csicsvari JL. 2008. Gamma oscillatory
firing reveals distinct populations of pyramidal cells in the CA1 region of the
hippocampus. Journal of Neuroscience. 28(9), 2274–2286.
mla: Senior, Timothy, et al. “Gamma Oscillatory Firing Reveals Distinct Populations
of Pyramidal Cells in the CA1 Region of the Hippocampus.” Journal of Neuroscience,
vol. 28, no. 9, Society for Neuroscience, 2008, pp. 2274–86, doi:10.1523/JNEUROSCI.4669-07.2008.
short: T. Senior, J. Huxter, K. Allen, J. O’Neill, J.L. Csicsvari, Journal of Neuroscience
28 (2008) 2274–2286.
date_created: 2018-12-11T12:03:51Z
date_published: 2008-02-27T00:00:00Z
date_updated: 2021-01-12T07:44:09Z
day: '27'
doi: 10.1523/JNEUROSCI.4669-07.2008
extern: 1
intvolume: ' 28'
issue: '9'
month: '02'
page: 2274 - 2286
publication: Journal of Neuroscience
publication_status: published
publisher: Society for Neuroscience
publist_id: '2847'
quality_controlled: 0
status: public
title: Gamma oscillatory firing reveals distinct populations of pyramidal cells in
the CA1 region of the hippocampus
type: journal_article
volume: 28
year: '2008'
...
---
_id: '3544'
abstract:
- lang: eng
text: In the subthalamic nucleus (STN) of Parkinson's disease (PD) patients, a pronounced
synchronization of oscillatory activity at beta frequencies (15-30 Hz) accompanies
movement difficulties. Abnormal beta oscillations and motor symptoms are concomitantly
and acutely suppressed by dopaminergic therapies, suggesting that these inappropriate
rhythms might also emerge acutely from disrupted dopamine transmission. The neural
basis of these abnormal beta oscillations is unclear, and how they might compromise
information processing, or how they arise, is unknown. Using a 6-hydroxydopamine-lesioned
rodent model of PD, we demonstrate that beta oscillations are inappropriately
exaggerated, compared with controls, in a brain-state-dependent manner after chronic
dopamine loss. Exaggerated beta oscillations are expressed at the levels of single
neurons and small neuronal ensembles, and are focally present and spatially distributed
within STN. They are also expressed in synchronous population activities, as evinced
by oscillatory local field potentials, in STN and cortex. Excessively synchronized
beta oscillations reduce the information coding capacity of STN neuronal ensembles,
which may contribute to parkinsonian motor impairment. Acute disruption of dopamine
transmission in control animals with antagonists of D-1/D-2 receptors did not
exaggerate STN or cortical beta oscillations. Moreover, beta oscillations were
not exaggerated until several days after 6-hydroxydopamine injections. Thus, contrary
to predictions, abnormally amplified beta oscillations in cortico-STN circuits
do not result simply from an acute absence of dopamine receptor stimulation, but
are instead delayed sequelae of chronic dopamine depletion. Targeting the plastic
processes underlying the delayed emergence of pathological beta oscillations after
continuing dopaminergic dysfunction may offer considerable therapeutic promise.
author:
- first_name: Nicolas
full_name: Mallet,Nicolas
last_name: Mallet
- first_name: Alek
full_name: Pogosyan,Alek
last_name: Pogosyan
- first_name: Andrew
full_name: Sharott,Andrew
last_name: Sharott
- first_name: Jozsef L
full_name: Jozsef Csicsvari
id: 3FA14672-F248-11E8-B48F-1D18A9856A87
last_name: Csicsvari
orcid: 0000-0002-5193-4036
- first_name: John
full_name: Bolam, John Paul
last_name: Bolam
- first_name: Peter
full_name: Brown,Peter
last_name: Brown
- first_name: Peter
full_name: Magill,Peter J
last_name: Magill
citation:
ama: Mallet N, Pogosyan A, Sharott A, et al. Disrupted dopamine transmission and
the emergence of exaggerated beta oscillations in subthalamic nucleus and cerebral
cortex. Journal of Neuroscience. 2008;28(18):4795-4806. doi:10.1523/JNEUROSCI.0123-08.2008
apa: Mallet, N., Pogosyan, A., Sharott, A., Csicsvari, J. L., Bolam, J., Brown,
P., & Magill, P. (2008). Disrupted dopamine transmission and the emergence
of exaggerated beta oscillations in subthalamic nucleus and cerebral cortex. Journal
of Neuroscience. Society for Neuroscience. https://doi.org/10.1523/JNEUROSCI.0123-08.2008
chicago: Mallet, Nicolas, Alek Pogosyan, Andrew Sharott, Jozsef L Csicsvari, John
Bolam, Peter Brown, and Peter Magill. “Disrupted Dopamine Transmission and the
Emergence of Exaggerated Beta Oscillations in Subthalamic Nucleus and Cerebral
Cortex.” Journal of Neuroscience. Society for Neuroscience, 2008. https://doi.org/10.1523/JNEUROSCI.0123-08.2008.
ieee: N. Mallet et al., “Disrupted dopamine transmission and the emergence
of exaggerated beta oscillations in subthalamic nucleus and cerebral cortex,”
Journal of Neuroscience, vol. 28, no. 18. Society for Neuroscience, pp.
4795–4806, 2008.
ista: Mallet N, Pogosyan A, Sharott A, Csicsvari JL, Bolam J, Brown P, Magill P.
2008. Disrupted dopamine transmission and the emergence of exaggerated beta oscillations
in subthalamic nucleus and cerebral cortex. Journal of Neuroscience. 28(18), 4795–4806.
mla: Mallet, Nicolas, et al. “Disrupted Dopamine Transmission and the Emergence
of Exaggerated Beta Oscillations in Subthalamic Nucleus and Cerebral Cortex.”
Journal of Neuroscience, vol. 28, no. 18, Society for Neuroscience, 2008,
pp. 4795–806, doi:10.1523/JNEUROSCI.0123-08.2008.
short: N. Mallet, A. Pogosyan, A. Sharott, J.L. Csicsvari, J. Bolam, P. Brown, P.
Magill, Journal of Neuroscience 28 (2008) 4795–4806.
date_created: 2018-12-11T12:03:53Z
date_published: 2008-04-30T00:00:00Z
date_updated: 2021-01-12T07:44:12Z
day: '30'
doi: 10.1523/JNEUROSCI.0123-08.2008
extern: 1
intvolume: ' 28'
issue: '18'
month: '04'
page: 4795 - 4806
publication: Journal of Neuroscience
publication_status: published
publisher: Society for Neuroscience
publist_id: '2842'
quality_controlled: 0
status: public
title: Disrupted dopamine transmission and the emergence of exaggerated beta oscillations
in subthalamic nucleus and cerebral cortex
type: journal_article
volume: 28
year: '2008'
...
---
_id: '3577'
alternative_title:
- Mathematics and Visualization
author:
- first_name: Silvia
full_name: Biasotti, Silvia
last_name: Biasotti
- first_name: Dominique
full_name: Attali, Dominique
last_name: Attali
- first_name: Jean
full_name: Boissonnat, Jean-Daniel
last_name: Boissonnat
- first_name: Herbert
full_name: Herbert Edelsbrunner
id: 3FB178DA-F248-11E8-B48F-1D18A9856A87
last_name: Edelsbrunner
orcid: 0000-0002-9823-6833
- first_name: Gershon
full_name: Elber, Gershon
last_name: Elber
- first_name: Michela
full_name: Mortara, Michela
last_name: Mortara
- first_name: Gabriella
full_name: Sanniti di Baja, Gabriella
last_name: Sanniti Di Baja
- first_name: Michela
full_name: Spagnuolo, Michela
last_name: Spagnuolo
- first_name: Mirela
full_name: Tanase, Mirela
last_name: Tanase
- first_name: Remco
full_name: Veltkam, Remco
last_name: Veltkam
citation:
ama: 'Biasotti S, Attali D, Boissonnat J, et al. Skeletal structures. In: Shape
Analysis and Structuring. Springer; 2008:145-183. doi:10.1007/978-3-540-33265-7_5'
apa: Biasotti, S., Attali, D., Boissonnat, J., Edelsbrunner, H., Elber, G., Mortara,
M., … Veltkam, R. (2008). Skeletal structures. In Shape Analysis and Structuring
(pp. 145–183). Springer. https://doi.org/10.1007/978-3-540-33265-7_5
chicago: Biasotti, Silvia, Dominique Attali, Jean Boissonnat, Herbert Edelsbrunner,
Gershon Elber, Michela Mortara, Gabriella Sanniti Di Baja, Michela Spagnuolo,
Mirela Tanase, and Remco Veltkam. “Skeletal Structures.” In Shape Analysis
and Structuring, 145–83. Springer, 2008. https://doi.org/10.1007/978-3-540-33265-7_5.
ieee: S. Biasotti et al., “Skeletal structures,” in Shape Analysis and
Structuring, Springer, 2008, pp. 145–183.
ista: 'Biasotti S, Attali D, Boissonnat J, Edelsbrunner H, Elber G, Mortara M, Sanniti
Di Baja G, Spagnuolo M, Tanase M, Veltkam R. 2008.Skeletal structures. In: Shape
Analysis and Structuring. Mathematics and Visualization, , 145–183.'
mla: Biasotti, Silvia, et al. “Skeletal Structures.” Shape Analysis and Structuring,
Springer, 2008, pp. 145–83, doi:10.1007/978-3-540-33265-7_5.
short: S. Biasotti, D. Attali, J. Boissonnat, H. Edelsbrunner, G. Elber, M. Mortara,
G. Sanniti Di Baja, M. Spagnuolo, M. Tanase, R. Veltkam, in:, Shape Analysis and
Structuring, Springer, 2008, pp. 145–183.
date_created: 2018-12-11T12:04:03Z
date_published: 2008-01-01T00:00:00Z
date_updated: 2021-01-12T07:44:25Z
day: '01'
doi: 10.1007/978-3-540-33265-7_5
extern: 1
month: '01'
page: 145 - 183
publication: Shape Analysis and Structuring
publication_status: published
publisher: Springer
publist_id: '2808'
quality_controlled: 0
status: public
title: Skeletal structures
type: book_chapter
year: '2008'
...