---
_id: '8515'
abstract:
- lang: eng
text: "We consider the evolution of a set carried by a space periodic incompressible
stochastic flow in a Euclidean space. We\r\nreport on three main results obtained
in [8, 9, 10] concerning long time behaviour for a typical realization of the
stochastic flow. First, at time t most of the particles are at a distance of order
√t away from the origin. Moreover, we prove a Central Limit Theorem for the evolution
of a measure carried by the flow, which holds for almost every realization of
the flow. Second, we show the existence of a zero measure full Hausdorff dimension
set of points, which\r\nescape to infinity at a linear rate. Third, in the 2-dimensional
case, we study the set of points visited by the original set by time t. Such a
set, when scaled down by the factor of t, has a limiting non random shape."
article_processing_charge: No
author:
- first_name: Vadim
full_name: Kaloshin, Vadim
id: FE553552-CDE8-11E9-B324-C0EBE5697425
last_name: Kaloshin
orcid: 0000-0002-6051-2628
- first_name: D.
full_name: DOLGOPYAT, D.
last_name: DOLGOPYAT
- first_name: L.
full_name: KORALOV, L.
last_name: KORALOV
citation:
ama: 'Kaloshin V, DOLGOPYAT D, KORALOV L. Long time behaviour of periodic stochastic
flows. In: XIVth International Congress on Mathematical Physics. World
Scientific; 2006:290-295. doi:10.1142/9789812704016_0026'
apa: 'Kaloshin, V., DOLGOPYAT, D., & KORALOV, L. (2006). Long time behaviour
of periodic stochastic flows. In XIVth International Congress on Mathematical
Physics (pp. 290–295). Lisbon, Portugal: World Scientific. https://doi.org/10.1142/9789812704016_0026'
chicago: Kaloshin, Vadim, D. DOLGOPYAT, and L. KORALOV. “Long Time Behaviour of
Periodic Stochastic Flows.” In XIVth International Congress on Mathematical
Physics, 290–95. World Scientific, 2006. https://doi.org/10.1142/9789812704016_0026.
ieee: V. Kaloshin, D. DOLGOPYAT, and L. KORALOV, “Long time behaviour of periodic
stochastic flows,” in XIVth International Congress on Mathematical Physics,
Lisbon, Portugal, 2006, pp. 290–295.
ista: Kaloshin V, DOLGOPYAT D, KORALOV L. 2006. Long time behaviour of periodic
stochastic flows. XIVth International Congress on Mathematical Physics. International
Congress on Mathematical Physics, 290–295.
mla: Kaloshin, Vadim, et al. “Long Time Behaviour of Periodic Stochastic Flows.”
XIVth International Congress on Mathematical Physics, World Scientific,
2006, pp. 290–95, doi:10.1142/9789812704016_0026.
short: V. Kaloshin, D. DOLGOPYAT, L. KORALOV, in:, XIVth International Congress
on Mathematical Physics, World Scientific, 2006, pp. 290–295.
conference:
end_date: 2003-08-02
location: Lisbon, Portugal
name: International Congress on Mathematical Physics
start_date: 2003-07-28
date_created: 2020-09-18T10:48:59Z
date_published: 2006-03-01T00:00:00Z
date_updated: 2021-01-12T08:19:49Z
day: '01'
doi: 10.1142/9789812704016_0026
extern: '1'
language:
- iso: eng
month: '03'
oa_version: None
page: 290-295
publication: XIVth International Congress on Mathematical Physics
publication_identifier:
isbn:
- '9789812562012'
- '9789812704016'
publication_status: published
publisher: World Scientific
quality_controlled: '1'
status: public
title: Long time behaviour of periodic stochastic flows
type: conference
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
year: '2006'
...
---
_id: '868'
abstract:
- lang: eng
text: 'Background: The glyoxylate cycle is thought to be present in bacteria, protists,
plants, fungi, and nematodes, but not in other Metazoa. However, activity of the
glyoxylate cycle enzymes, malate synthase (MS) and isocitrate lyase (ICL), in
animal tissues has been reported. In order to clarify the status of the MS and
ICL genes in animals and get an insight into their evolution, we undertook a comparative-genomic
study. Results: Using sequence similarity searches, we identified MS genes in
arthropods, echinoderms, and vertebrates, including platypus and opossum, but
not in the numerous sequenced genomes of placental mammals. The regions of the
placental mammals'' genomes expected to code for malate synthase, as determined
by comparison of the gene orders in vertebrate genomes, show clear similarity
to the opossum MS sequence but contain stop codons, indicating that the MS gene
became a pseudogene in placental mammals. By contrast, the ICL gene is undetectable
in animals other than the nematodes that possess a bifunctional, fused ICL-MS
gene. Examination of phylogenetic trees of MS and ICL suggests multiple horizontal
gene transfer events that probably went in both directions between several bacterial
and eukaryotic lineages. The strongest evidence was obtained for the acquisition
of the bifunctional ICL-MS gene from an as yet unknown bacterial source with the
corresponding operonic organization by the common ancestor of the nematodes. Conclusion:
The distribution of the MS and ICL genes in animals suggests that either they
encode alternative enzymes of the glyoxylate cycle that are not orthologous to
the known MS and ICL or the animal MS acquired a new function that remains to
be characterized. Regardless of the ultimate solution to this conundrum, the genes
for the glyoxylate cycle enzymes present a remarkable variety of evolutionary
events including unusual horizontal gene transfer from bacteria to animals.'
acknowledgement: The authors thank Alexey Kondrashov for suggesting the possibility
of non- orthologous gene displacement in glyoxylate cycle specific enzymes and for
critical reading of this manuscript. FAK is a National Science Foundation Graduate
Fellow.
author:
- first_name: Fyodor
full_name: Fyodor Kondrashov
id: 44FDEF62-F248-11E8-B48F-1D18A9856A87
last_name: Kondrashov
orcid: 0000-0001-8243-4694
- first_name: Eugene
full_name: Koonin, Eugene V
last_name: Koonin
- first_name: Igor
full_name: Morgunov, Igor G
last_name: Morgunov
- first_name: Tatiana
full_name: Finogenova, Tatiana V
last_name: Finogenova
- first_name: Marie
full_name: Kondrashova, Marie N
last_name: Kondrashova
citation:
ama: Kondrashov F, Koonin E, Morgunov I, Finogenova T, Kondrashova M. Evolution
of glyoxylate cycle enzymes in Metazoa Evidence of multiple horizontal transfer
events and pseudogene formation. Biology Direct. 2006;1. doi:10.1186/1745-6150-1-31
apa: Kondrashov, F., Koonin, E., Morgunov, I., Finogenova, T., & Kondrashova,
M. (2006). Evolution of glyoxylate cycle enzymes in Metazoa Evidence of multiple
horizontal transfer events and pseudogene formation. Biology Direct. BioMed
Central. https://doi.org/10.1186/1745-6150-1-31
chicago: Kondrashov, Fyodor, Eugene Koonin, Igor Morgunov, Tatiana Finogenova, and
Marie Kondrashova. “Evolution of Glyoxylate Cycle Enzymes in Metazoa Evidence
of Multiple Horizontal Transfer Events and Pseudogene Formation.” Biology Direct.
BioMed Central, 2006. https://doi.org/10.1186/1745-6150-1-31.
ieee: F. Kondrashov, E. Koonin, I. Morgunov, T. Finogenova, and M. Kondrashova,
“Evolution of glyoxylate cycle enzymes in Metazoa Evidence of multiple horizontal
transfer events and pseudogene formation,” Biology Direct, vol. 1. BioMed
Central, 2006.
ista: Kondrashov F, Koonin E, Morgunov I, Finogenova T, Kondrashova M. 2006. Evolution
of glyoxylate cycle enzymes in Metazoa Evidence of multiple horizontal transfer
events and pseudogene formation. Biology Direct. 1.
mla: Kondrashov, Fyodor, et al. “Evolution of Glyoxylate Cycle Enzymes in Metazoa
Evidence of Multiple Horizontal Transfer Events and Pseudogene Formation.” Biology
Direct, vol. 1, BioMed Central, 2006, doi:10.1186/1745-6150-1-31.
short: F. Kondrashov, E. Koonin, I. Morgunov, T. Finogenova, M. Kondrashova, Biology
Direct 1 (2006).
date_created: 2018-12-11T11:48:56Z
date_published: 2006-10-23T00:00:00Z
date_updated: 2021-01-12T08:20:31Z
day: '23'
doi: 10.1186/1745-6150-1-31
extern: 1
intvolume: ' 1'
license: https://creativecommons.org/licenses/by/4.0/
month: '10'
publication: Biology Direct
publication_status: published
publisher: BioMed Central
publist_id: '6778'
quality_controlled: 0
status: public
title: Evolution of glyoxylate cycle enzymes in Metazoa Evidence of multiple horizontal
transfer events and pseudogene formation
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
volume: 1
year: '2006'
...
---
_id: '873'
abstract:
- lang: eng
text: New genes commonly appear through complete or partial duplications of pre-existing
genes. Duplications of long DNA segments are constantly produced by rare mutations,
may become fixed in a population by selection or random drift, and are subject
to divergent evolution of the paralogous sequences after fixation, although gene
conversion can impede this process. New data shed some light on each of these
processes. Mutations which involve duplications can occur through at least two
different mechanisms, backward strand slippage during DNA replication and unequal
crossing-over. The background rate of duplication of a complete gene in humans
is 10-9-10-10 per generation, although many genes located within hot-spots of
large-scale mutation are duplicated much more often. Many gene duplications affect
fitness strongly, and are responsible, through gene dosage effects, for a number
of genetic diseases. However, high levels of intrapopulation polymorphism caused
by presence or absence of long, gene-containing DNA segments imply that some duplications
are not under strong selection. The polymorphism to fixation ratios appear to
be approximately the same for gene duplications and for presumably selectively
neutral nucleotide substitutions, which, according to the McDonald-Kreitman test,
is consistent with selective neutrality of duplications. However, this pattern
can also be due to negative selection against most of segregating duplications
and positive selection for at least some duplications which become fixed. Patterns
in post-fixation evolution of duplicated genes do not easily reveal the causes
of fixations. Many gene duplications which became fixed recently in a variety
of organisms were positively selected because the increased expression of the
corresponding genes was beneficial. The effects of gene dosage provide a unified
framework for studying all phases of the life history of a gene duplication. Application
of well-known methods of evolutionary genetics to accumulating data on new, polymorphic,
and fixed duplication will enhance our understanding of the role of natural selection
in the evolution by gene duplication.
author:
- first_name: Fyodor
full_name: Fyodor Kondrashov
id: 44FDEF62-F248-11E8-B48F-1D18A9856A87
last_name: Kondrashov
orcid: 0000-0001-8243-4694
- first_name: Alexey
full_name: Kondrashov, Alexey S
last_name: Kondrashov
citation:
ama: Kondrashov F, Kondrashov A. Role of selection in fixation of gene duplications.
Journal of Theoretical Biology. 2006;239(2):141-151. doi:10.1016/j.jtbi.2005.08.033
apa: Kondrashov, F., & Kondrashov, A. (2006). Role of selection in fixation
of gene duplications. Journal of Theoretical Biology. Elsevier. https://doi.org/10.1016/j.jtbi.2005.08.033
chicago: Kondrashov, Fyodor, and Alexey Kondrashov. “Role of Selection in Fixation
of Gene Duplications.” Journal of Theoretical Biology. Elsevier, 2006.
https://doi.org/10.1016/j.jtbi.2005.08.033.
ieee: F. Kondrashov and A. Kondrashov, “Role of selection in fixation of gene duplications,”
Journal of Theoretical Biology, vol. 239, no. 2. Elsevier, pp. 141–151,
2006.
ista: Kondrashov F, Kondrashov A. 2006. Role of selection in fixation of gene duplications.
Journal of Theoretical Biology. 239(2), 141–151.
mla: Kondrashov, Fyodor, and Alexey Kondrashov. “Role of Selection in Fixation of
Gene Duplications.” Journal of Theoretical Biology, vol. 239, no. 2, Elsevier,
2006, pp. 141–51, doi:10.1016/j.jtbi.2005.08.033.
short: F. Kondrashov, A. Kondrashov, Journal of Theoretical Biology 239 (2006) 141–151.
date_created: 2018-12-11T11:48:57Z
date_published: 2006-03-21T00:00:00Z
date_updated: 2021-01-12T08:20:47Z
day: '21'
doi: 10.1016/j.jtbi.2005.08.033
extern: 1
intvolume: ' 239'
issue: '2'
month: '03'
page: 141 - 151
publication: Journal of Theoretical Biology
publication_status: published
publisher: Elsevier
publist_id: '6773'
quality_controlled: 0
status: public
title: Role of selection in fixation of gene duplications
type: journal_article
volume: 239
year: '2006'
...
---
_id: '903'
abstract:
- lang: eng
text: 'Background: Carcinogenesis typically involves multiple somatic mutations
in caretaker (DNA repair) and gatekeeper (tumor suppressors and oncogenes) genes.
Analysis of mutation spectra of the tumor suppressor that is most commonly mutated
in human cancers, p53, unexpectedly suggested that somatic evolution of the p53
gene during tumorigenesis is dominated by positive selection for gain of function.
This conclusion is supported by accumulating experimental evidence of evolution
of new functions of p53 in tumors. These findings prompted a genome-wide analysis
of possible positive selection during tumor evolution. Methods: A comprehensive
analysis of probable somatic mutations in the sequences of Expressed Sequence
Tags (ESTs) from malignant tumors and normal tissues was performed in order to
access the prevalence of positive selection in cancer evolution. For each EST,
the numbers of synonymous and non-synonymous substitutions were calculated. In
order to identify genes with a signature of positive selection in cancers, these
numbers were compared to: i) expected numbers and ii) the numbers for the respective
genes in the ESTs from normal tissues. Results: We identified 112 genes with a
signature of positive selection in cancers, i.e., a significantly elevated ratio
of non-synonymous to synonymous substitutions, in tumors as compared to 37 such
genes in an approximately equal-sized EST collection from normal tissues. A substantial
fraction of the tumor-specific positive-selection candidates have experimentally
demonstrated or strongly predicted links to cancer. Conclusion: The results of
EST analysis should be interpreted with extreme caution given the noise introduced
by sequencing errors and undetected polymorphisms. Furthermore, an inherent limitation
of EST analysis is that multiple mutations amenable to statistical analysis can
be detected only in relatively highly expressed genes. Nevertheless, the present
results suggest that positive selection might affect a substantial number of genes
during tumorigenic somatic evolution.'
acknowledgement: This work was supported by the Intramural Research Program of the
National Library of Medicine at the National Institutes of Health/DHHS. FAK is an
NSF Graduate Fellow. We thank Yuri Pavlov for helpful discussions.
author:
- first_name: Vladimir
full_name: Babenko, Vladimir N
last_name: Babenko
- first_name: Malay
full_name: Basu, Malay K
last_name: Basu
- first_name: Fyodor
full_name: Fyodor Kondrashov
id: 44FDEF62-F248-11E8-B48F-1D18A9856A87
last_name: Kondrashov
orcid: 0000-0001-8243-4694
- first_name: Igor
full_name: Rogozin, Igor B
last_name: Rogozin
- first_name: Eugene
full_name: Koonin, Eugene V
last_name: Koonin
citation:
ama: Babenko V, Basu M, Kondrashov F, Rogozin I, Koonin E. Signs of positive selection
of somatic mutations in human cancers detected by EST sequence analysis. BMC
Cancer. 2006;6. doi:10.1186/1471-2407-6-36
apa: Babenko, V., Basu, M., Kondrashov, F., Rogozin, I., & Koonin, E. (2006).
Signs of positive selection of somatic mutations in human cancers detected by
EST sequence analysis. BMC Cancer. BioMed Central. https://doi.org/10.1186/1471-2407-6-36
chicago: Babenko, Vladimir, Malay Basu, Fyodor Kondrashov, Igor Rogozin, and Eugene
Koonin. “Signs of Positive Selection of Somatic Mutations in Human Cancers Detected
by EST Sequence Analysis.” BMC Cancer. BioMed Central, 2006. https://doi.org/10.1186/1471-2407-6-36.
ieee: V. Babenko, M. Basu, F. Kondrashov, I. Rogozin, and E. Koonin, “Signs of positive
selection of somatic mutations in human cancers detected by EST sequence analysis,”
BMC Cancer, vol. 6. BioMed Central, 2006.
ista: Babenko V, Basu M, Kondrashov F, Rogozin I, Koonin E. 2006. Signs of positive
selection of somatic mutations in human cancers detected by EST sequence analysis.
BMC Cancer. 6.
mla: Babenko, Vladimir, et al. “Signs of Positive Selection of Somatic Mutations
in Human Cancers Detected by EST Sequence Analysis.” BMC Cancer, vol. 6,
BioMed Central, 2006, doi:10.1186/1471-2407-6-36.
short: V. Babenko, M. Basu, F. Kondrashov, I. Rogozin, E. Koonin, BMC Cancer 6 (2006).
date_created: 2018-12-11T11:49:07Z
date_published: 2006-02-09T00:00:00Z
date_updated: 2021-01-12T08:21:47Z
day: '09'
doi: 10.1186/1471-2407-6-36
extern: 1
intvolume: ' 6'
month: '02'
publication: BMC Cancer
publication_status: published
publisher: BioMed Central
publist_id: '6744'
quality_controlled: 0
status: public
title: Signs of positive selection of somatic mutations in human cancers detected
by EST sequence analysis
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
volume: 6
year: '2006'
...
---
_id: '9505'
abstract:
- lang: eng
text: 'Cytosine methylation, a common form of DNA modification that antagonizes
transcription, is found at transposons and repeats in vertebrates, plants and
fungi. Here we have mapped DNA methylation in the entire Arabidopsis thaliana
genome at high resolution. DNA methylation covers transposons and is present within
a large fraction of A. thaliana genes. Methylation within genes is conspicuously
biased away from gene ends, suggesting a dependence on RNA polymerase transit.
Genic methylation is strongly influenced by transcription: moderately transcribed
genes are most likely to be methylated, whereas genes at either extreme are least
likely. In turn, transcription is influenced by methylation: short methylated
genes are poorly expressed, and loss of methylation in the body of a gene leads
to enhanced transcription. Our results indicate that genic transcription and DNA
methylation are closely interwoven processes.'
article_processing_charge: No
article_type: original
author:
- first_name: Daniel
full_name: Zilberman, Daniel
id: 6973db13-dd5f-11ea-814e-b3e5455e9ed1
last_name: Zilberman
orcid: 0000-0002-0123-8649
- first_name: Mary
full_name: Gehring, Mary
last_name: Gehring
- first_name: Robert K.
full_name: Tran, Robert K.
last_name: Tran
- first_name: Tracy
full_name: Ballinger, Tracy
last_name: Ballinger
- first_name: Steven
full_name: Henikoff, Steven
last_name: Henikoff
citation:
ama: Zilberman D, Gehring M, Tran RK, Ballinger T, Henikoff S. Genome-wide analysis
of Arabidopsis thaliana DNA methylation uncovers an interdependence between methylation
and transcription. Nature Genetics. 2006;39(1):61-69. doi:10.1038/ng1929
apa: Zilberman, D., Gehring, M., Tran, R. K., Ballinger, T., & Henikoff, S.
(2006). Genome-wide analysis of Arabidopsis thaliana DNA methylation uncovers
an interdependence between methylation and transcription. Nature Genetics.
Nature Publishing Group. https://doi.org/10.1038/ng1929
chicago: Zilberman, Daniel, Mary Gehring, Robert K. Tran, Tracy Ballinger, and Steven
Henikoff. “Genome-Wide Analysis of Arabidopsis Thaliana DNA Methylation Uncovers
an Interdependence between Methylation and Transcription.” Nature Genetics.
Nature Publishing Group, 2006. https://doi.org/10.1038/ng1929.
ieee: D. Zilberman, M. Gehring, R. K. Tran, T. Ballinger, and S. Henikoff, “Genome-wide
analysis of Arabidopsis thaliana DNA methylation uncovers an interdependence between
methylation and transcription,” Nature Genetics, vol. 39, no. 1. Nature
Publishing Group, pp. 61–69, 2006.
ista: Zilberman D, Gehring M, Tran RK, Ballinger T, Henikoff S. 2006. Genome-wide
analysis of Arabidopsis thaliana DNA methylation uncovers an interdependence between
methylation and transcription. Nature Genetics. 39(1), 61–69.
mla: Zilberman, Daniel, et al. “Genome-Wide Analysis of Arabidopsis Thaliana DNA
Methylation Uncovers an Interdependence between Methylation and Transcription.”
Nature Genetics, vol. 39, no. 1, Nature Publishing Group, 2006, pp. 61–69,
doi:10.1038/ng1929.
short: D. Zilberman, M. Gehring, R.K. Tran, T. Ballinger, S. Henikoff, Nature Genetics
39 (2006) 61–69.
date_created: 2021-06-07T12:19:31Z
date_published: 2006-11-26T00:00:00Z
date_updated: 2021-12-14T09:02:51Z
day: '26'
department:
- _id: DaZi
doi: 10.1038/ng1929
extern: '1'
external_id:
pmid:
- '17128275'
intvolume: ' 39'
issue: '1'
language:
- iso: eng
month: '11'
oa_version: None
page: 61-69
pmid: 1
publication: Nature Genetics
publication_identifier:
eissn:
- 1546-1718
issn:
- 1061-4036
publication_status: published
publisher: Nature Publishing Group
quality_controlled: '1'
scopus_import: '1'
status: public
title: Genome-wide analysis of Arabidopsis thaliana DNA methylation uncovers an interdependence
between methylation and transcription
type: journal_article
user_id: 8b945eb4-e2f2-11eb-945a-df72226e66a9
volume: 39
year: '2006'
...
---
_id: '6151'
author:
- first_name: Iris
full_name: Salecker, Iris
last_name: Salecker
- first_name: Michael
full_name: Häusser, Michael
last_name: Häusser
- first_name: Mario
full_name: de Bono, Mario
id: 4E3FF80E-F248-11E8-B48F-1D18A9856A87
last_name: de Bono
orcid: 0000-0001-8347-0443
citation:
ama: 'Salecker I, Häusser M, de Bono M. On the axonal road to circuit function and
behaviour: Workshop on the assembly and function of neuronal circuits. EMBO
reports. 2006;7(6):585-589. doi:10.1038/sj.embor.7400713'
apa: 'Salecker, I., Häusser, M., & de Bono, M. (2006). On the axonal road to
circuit function and behaviour: Workshop on the assembly and function of neuronal
circuits. EMBO Reports. Wiley. https://doi.org/10.1038/sj.embor.7400713'
chicago: 'Salecker, Iris, Michael Häusser, and Mario de Bono. “On the Axonal Road
to Circuit Function and Behaviour: Workshop on the Assembly and Function of Neuronal
Circuits.” EMBO Reports. Wiley, 2006. https://doi.org/10.1038/sj.embor.7400713.'
ieee: 'I. Salecker, M. Häusser, and M. de Bono, “On the axonal road to circuit function
and behaviour: Workshop on the assembly and function of neuronal circuits,” EMBO
reports, vol. 7, no. 6. Wiley, pp. 585–589, 2006.'
ista: 'Salecker I, Häusser M, de Bono M. 2006. On the axonal road to circuit function
and behaviour: Workshop on the assembly and function of neuronal circuits. EMBO
reports. 7(6), 585–589.'
mla: 'Salecker, Iris, et al. “On the Axonal Road to Circuit Function and Behaviour:
Workshop on the Assembly and Function of Neuronal Circuits.” EMBO Reports,
vol. 7, no. 6, Wiley, 2006, pp. 585–89, doi:10.1038/sj.embor.7400713.'
short: I. Salecker, M. Häusser, M. de Bono, EMBO Reports 7 (2006) 585–589.
date_created: 2019-03-21T08:50:43Z
date_published: 2006-06-01T00:00:00Z
date_updated: 2021-01-12T08:06:23Z
day: '01'
doi: 10.1038/sj.embor.7400713
extern: '1'
external_id:
pmid:
- '16729018'
intvolume: ' 7'
issue: '6'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://europepmc.org/articles/pmc1479602
month: '06'
oa: 1
oa_version: Published Version
page: 585-589
pmid: 1
publication: EMBO reports
publication_identifier:
issn:
- 1469-221X
- 1469-3178
publication_status: published
publisher: Wiley
quality_controlled: '1'
status: public
title: 'On the axonal road to circuit function and behaviour: Workshop on the assembly
and function of neuronal circuits'
type: journal_article
user_id: 3E5EF7F0-F248-11E8-B48F-1D18A9856A87
volume: 7
year: '2006'
...
---
_id: '6152'
author:
- first_name: Candida
full_name: Rogers, Candida
last_name: Rogers
- first_name: Annelie
full_name: Persson, Annelie
last_name: Persson
- first_name: Benny
full_name: Cheung, Benny
last_name: Cheung
- first_name: Mario
full_name: de Bono, Mario
id: 4E3FF80E-F248-11E8-B48F-1D18A9856A87
last_name: de Bono
orcid: 0000-0001-8347-0443
citation:
ama: Rogers C, Persson A, Cheung B, de Bono M. Behavioral motifs and neural pathways
coordinating O2 responses and aggregation in C. elegans. Current Biology.
2006;16(7):649-659. doi:10.1016/j.cub.2006.03.023
apa: Rogers, C., Persson, A., Cheung, B., & de Bono, M. (2006). Behavioral motifs
and neural pathways coordinating O2 responses and aggregation in C. elegans. Current
Biology. Elsevier. https://doi.org/10.1016/j.cub.2006.03.023
chicago: Rogers, Candida, Annelie Persson, Benny Cheung, and Mario de Bono. “Behavioral
Motifs and Neural Pathways Coordinating O2 Responses and Aggregation in C. Elegans.”
Current Biology. Elsevier, 2006. https://doi.org/10.1016/j.cub.2006.03.023.
ieee: C. Rogers, A. Persson, B. Cheung, and M. de Bono, “Behavioral motifs and neural
pathways coordinating O2 responses and aggregation in C. elegans,” Current
Biology, vol. 16, no. 7. Elsevier, pp. 649–659, 2006.
ista: Rogers C, Persson A, Cheung B, de Bono M. 2006. Behavioral motifs and neural
pathways coordinating O2 responses and aggregation in C. elegans. Current Biology.
16(7), 649–659.
mla: Rogers, Candida, et al. “Behavioral Motifs and Neural Pathways Coordinating
O2 Responses and Aggregation in C. Elegans.” Current Biology, vol. 16,
no. 7, Elsevier, 2006, pp. 649–59, doi:10.1016/j.cub.2006.03.023.
short: C. Rogers, A. Persson, B. Cheung, M. de Bono, Current Biology 16 (2006) 649–659.
date_created: 2019-03-21T09:15:27Z
date_published: 2006-04-04T00:00:00Z
date_updated: 2021-01-12T08:06:23Z
day: '04'
doi: 10.1016/j.cub.2006.03.023
extern: '1'
external_id:
pmid:
- '16581509'
intvolume: ' 16'
issue: '7'
language:
- iso: eng
month: '04'
oa_version: None
page: 649-659
pmid: 1
publication: Current Biology
publication_identifier:
issn:
- 0960-9822
publication_status: published
publisher: Elsevier
quality_controlled: '1'
status: public
title: Behavioral motifs and neural pathways coordinating O2 responses and aggregation
in C. elegans
type: journal_article
user_id: 3E5EF7F0-F248-11E8-B48F-1D18A9856A87
volume: 16
year: '2006'
...
---
_id: '7326'
abstract:
- lang: eng
text: 'Often the properties of a single cell are considered as representative for
a complete polymer electrolyte fuel cell stack or even a fuel cell system. In
some cases this comes close, however, in many real cases differences on several
scales become important. Cell interaction phenomena in fuel cell stacks that arise
from inequalities between adjacent cells are investigated in detail experimentally.
For that, a specialized 2-cell stack with advanced localized diagnostics was developed.
The results show that inequalities propagate by electrical coupling, inhomogeneous
cell polarization and inducing in-plane current in the common bipolar plate. The
effects of the different loss-mechanisms are analyzed and quantified. '
article_processing_charge: No
author:
- first_name: Felix N.
full_name: Büchi, Felix N.
last_name: Büchi
- first_name: Stefan Alexander
full_name: Freunberger, Stefan Alexander
id: A8CA28E6-CE23-11E9-AD2D-EC27E6697425
last_name: Freunberger
orcid: 0000-0003-2902-5319
- first_name: Marco
full_name: Santis, Marco
last_name: Santis
citation:
ama: 'Büchi FN, Freunberger SA, Santis M. What is learned beyond the scale of single
cells? In: ECS Transactions. Vol 3. ECS; 2006:963-968. doi:10.1149/1.2356215'
apa: 'Büchi, F. N., Freunberger, S. A., & Santis, M. (2006). What is learned
beyond the scale of single cells? In ECS Transactions (Vol. 3, pp. 963–968).
Cancun, Mexico: ECS. https://doi.org/10.1149/1.2356215'
chicago: Büchi, Felix N., Stefan Alexander Freunberger, and Marco Santis. “What
Is Learned beyond the Scale of Single Cells?” In ECS Transactions, 3:963–68.
ECS, 2006. https://doi.org/10.1149/1.2356215.
ieee: F. N. Büchi, S. A. Freunberger, and M. Santis, “What is learned beyond the
scale of single cells?,” in ECS Transactions, Cancun, Mexico, 2006, vol.
3, no. 1, pp. 963–968.
ista: Büchi FN, Freunberger SA, Santis M. 2006. What is learned beyond the scale
of single cells? ECS Transactions. ECS Meeting vol. 3, 963–968.
mla: Büchi, Felix N., et al. “What Is Learned beyond the Scale of Single Cells?”
ECS Transactions, vol. 3, no. 1, ECS, 2006, pp. 963–68, doi:10.1149/1.2356215.
short: F.N. Büchi, S.A. Freunberger, M. Santis, in:, ECS Transactions, ECS, 2006,
pp. 963–968.
conference:
end_date: 2006-11-03
location: Cancun, Mexico
name: ECS Meeting
start_date: 2006-10-29
date_created: 2020-01-15T12:22:44Z
date_published: 2006-11-03T00:00:00Z
date_updated: 2021-01-12T08:13:05Z
day: '03'
doi: 10.1149/1.2356215
extern: '1'
intvolume: ' 3'
issue: '1'
language:
- iso: eng
month: '11'
oa_version: None
page: 963-968
publication: ECS Transactions
publication_status: published
publisher: ECS
quality_controlled: '1'
status: public
title: What is learned beyond the scale of single cells?
type: conference
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 3
year: '2006'
...
---
_id: '7327'
abstract:
- lang: eng
text: "Propagation of performance changes to adjacent cells in polymer electrolyte
fuel cell stacks is studied by means of voltage monitoring and local current density
measurements in peripheral cells of the stack. A technical fuel cell stack has
been modified by implementing two independent reactant and coolant supplies in
order to deliberately change the performance of one cell (anomalous cell) and
study the coupling phenomena to adjacent cells (coupling cells), while keeping
the working conditions of the later cell-group unaltered.\r\nTwo anomalies are
studied: (i) air starvation and (ii) thermal anomaly, in a single anomalous cell
in the stack and their coupling to adjacent cells. The results have shown that
anomalies inducing considerable changes in the local current density of the anomalous
cell (such as air starvation) propagate to adjacent cells affecting their performance.
The propagation of local current density changes takes place via the common bipolar
plate due to its finite thickness and in-plane conductivity. Consequently, anomalies
which do not strongly influence the local current density distribution (such as
a thermal anomaly under the studied working conditions) do not propagate to adjacent
cells."
article_processing_charge: No
article_type: original
author:
- first_name: Marco
full_name: Santis, Marco
last_name: Santis
- first_name: Stefan Alexander
full_name: Freunberger, Stefan Alexander
id: A8CA28E6-CE23-11E9-AD2D-EC27E6697425
last_name: Freunberger
orcid: 0000-0003-2902-5319
- first_name: Matthias
full_name: Papra, Matthias
last_name: Papra
- first_name: Alexander
full_name: Wokaun, Alexander
last_name: Wokaun
- first_name: Felix N.
full_name: Büchi, Felix N.
last_name: Büchi
citation:
ama: Santis M, Freunberger SA, Papra M, Wokaun A, Büchi FN. Experimental investigation
of coupling phenomena in polymer electrolyte fuel cell stacks. Journal of Power
Sources. 2006;161(2):1076-1083. doi:10.1016/j.jpowsour.2006.06.007
apa: Santis, M., Freunberger, S. A., Papra, M., Wokaun, A., & Büchi, F. N. (2006).
Experimental investigation of coupling phenomena in polymer electrolyte fuel cell
stacks. Journal of Power Sources. Elsevier. https://doi.org/10.1016/j.jpowsour.2006.06.007
chicago: Santis, Marco, Stefan Alexander Freunberger, Matthias Papra, Alexander
Wokaun, and Felix N. Büchi. “Experimental Investigation of Coupling Phenomena
in Polymer Electrolyte Fuel Cell Stacks.” Journal of Power Sources. Elsevier,
2006. https://doi.org/10.1016/j.jpowsour.2006.06.007.
ieee: M. Santis, S. A. Freunberger, M. Papra, A. Wokaun, and F. N. Büchi, “Experimental
investigation of coupling phenomena in polymer electrolyte fuel cell stacks,”
Journal of Power Sources, vol. 161, no. 2. Elsevier, pp. 1076–1083, 2006.
ista: Santis M, Freunberger SA, Papra M, Wokaun A, Büchi FN. 2006. Experimental
investigation of coupling phenomena in polymer electrolyte fuel cell stacks. Journal
of Power Sources. 161(2), 1076–1083.
mla: Santis, Marco, et al. “Experimental Investigation of Coupling Phenomena in
Polymer Electrolyte Fuel Cell Stacks.” Journal of Power Sources, vol. 161,
no. 2, Elsevier, 2006, pp. 1076–83, doi:10.1016/j.jpowsour.2006.06.007.
short: M. Santis, S.A. Freunberger, M. Papra, A. Wokaun, F.N. Büchi, Journal of
Power Sources 161 (2006) 1076–1083.
date_created: 2020-01-15T12:22:56Z
date_published: 2006-10-27T00:00:00Z
date_updated: 2021-01-12T08:13:06Z
day: '27'
doi: 10.1016/j.jpowsour.2006.06.007
extern: '1'
intvolume: ' 161'
issue: '2'
language:
- iso: eng
month: '10'
oa_version: None
page: 1076-1083
publication: Journal of Power Sources
publication_identifier:
issn:
- 0378-7753
publication_status: published
publisher: Elsevier
status: public
title: Experimental investigation of coupling phenomena in polymer electrolyte fuel
cell stacks
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 161
year: '2006'
...
---
_id: '7328'
abstract:
- lang: eng
text: An experimental technique for measuring the current density distribution with
a resolution smaller than the channel/rib scale of the flow field in polymer electrolyte
fuel cells (PEFCs) is presented. The electron conductors in a plane perpendicular
to the channel direction are considered as two-dimensional resistors. Hence, the
current density is obtained from the solution of Laplace's equation with the potentials
at current collector and reaction layer as boundary conditions. Using ohmic drop
for calculating the local current, detailed knowledge of all resistances involved
is of prime importance. In particular, the contact resistance between the gas
diffusion layer (GDL) and flow field rib, as well as GDL bulk conductivity, are
strongly dependent on clamping pressure. They represent a substantial amount of
the total ohmic drop and therefore require careful consideration. The detailed
experimental setup as well as the concise procedure for quantitative data evaluation
is described. Finally, the method is applied successfully to a cell operated on
pure oxygen and air up to high current densities. The results show that electrical
and ionic resistances seem to govern the current distribution at low current regimes,
whereas mass transport limitations locally hamper the current production at high
loads.
article_number: A2158
article_processing_charge: No
article_type: original
author:
- first_name: Stefan Alexander
full_name: Freunberger, Stefan Alexander
id: A8CA28E6-CE23-11E9-AD2D-EC27E6697425
last_name: Freunberger
orcid: 0000-0003-2902-5319
- first_name: Mathias
full_name: Reum, Mathias
last_name: Reum
- first_name: Jörg
full_name: Evertz, Jörg
last_name: Evertz
- first_name: Alexander
full_name: Wokaun, Alexander
last_name: Wokaun
- first_name: Felix N.
full_name: Büchi, Felix N.
last_name: Büchi
citation:
ama: Freunberger SA, Reum M, Evertz J, Wokaun A, Büchi FN. Measuring the current
distribution in PEFCs with sub-millimeter resolution. Journal of The Electrochemical
Society. 2006;153(11). doi:10.1149/1.2345591
apa: Freunberger, S. A., Reum, M., Evertz, J., Wokaun, A., & Büchi, F. N. (2006).
Measuring the current distribution in PEFCs with sub-millimeter resolution. Journal
of The Electrochemical Society. The Electrochemical Society. https://doi.org/10.1149/1.2345591
chicago: Freunberger, Stefan Alexander, Mathias Reum, Jörg Evertz, Alexander Wokaun,
and Felix N. Büchi. “Measuring the Current Distribution in PEFCs with Sub-Millimeter
Resolution.” Journal of The Electrochemical Society. The Electrochemical
Society, 2006. https://doi.org/10.1149/1.2345591.
ieee: S. A. Freunberger, M. Reum, J. Evertz, A. Wokaun, and F. N. Büchi, “Measuring
the current distribution in PEFCs with sub-millimeter resolution,” Journal
of The Electrochemical Society, vol. 153, no. 11. The Electrochemical Society,
2006.
ista: Freunberger SA, Reum M, Evertz J, Wokaun A, Büchi FN. 2006. Measuring the
current distribution in PEFCs with sub-millimeter resolution. Journal of The Electrochemical
Society. 153(11), A2158.
mla: Freunberger, Stefan Alexander, et al. “Measuring the Current Distribution in
PEFCs with Sub-Millimeter Resolution.” Journal of The Electrochemical Society,
vol. 153, no. 11, A2158, The Electrochemical Society, 2006, doi:10.1149/1.2345591.
short: S.A. Freunberger, M. Reum, J. Evertz, A. Wokaun, F.N. Büchi, Journal of
The Electrochemical Society 153 (2006).
date_created: 2020-01-15T12:23:12Z
date_published: 2006-09-20T00:00:00Z
date_updated: 2021-01-12T08:13:06Z
day: '20'
doi: 10.1149/1.2345591
extern: '1'
intvolume: ' 153'
issue: '11'
language:
- iso: eng
month: '09'
oa_version: None
publication: Journal of The Electrochemical Society
publication_identifier:
issn:
- 0013-4651
publication_status: published
publisher: The Electrochemical Society
quality_controlled: '1'
status: public
title: Measuring the current distribution in PEFCs with sub-millimeter resolution
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 153
year: '2006'
...
---
_id: '7329'
abstract:
- lang: eng
text: A novel measurement principle for measuring the current distribution in polymer
electrolyte fuel cells (PEFCs) is introduced. It allows, in contrast to all other
known techniques, for the first time for a resolution smaller than the channel/rib
scale of the flow field in PEFCs. The current density is obtained by considering
the electron conductors in the cell as a two-dimensional resistor with the voltage
drop caused by the current. The method was applied to a cell operated on oxygen
up to high current densities. The results show that the ohmic resistances govern
the current distribution in the low current regime, whereas mass transport limitations
hamper the current production under the land at high loads.
article_processing_charge: No
article_type: original
author:
- first_name: Stefan Alexander
full_name: Freunberger, Stefan Alexander
id: A8CA28E6-CE23-11E9-AD2D-EC27E6697425
last_name: Freunberger
orcid: 0000-0003-2902-5319
- first_name: Mathias
full_name: Reum, Mathias
last_name: Reum
- first_name: Alexander
full_name: Wokaun, Alexander
last_name: Wokaun
- first_name: Felix N.
full_name: Büchi, Felix N.
last_name: Büchi
citation:
ama: Freunberger SA, Reum M, Wokaun A, Büchi FN. Expanding current distribution
measurement in PEFCs to sub-millimeter resolution. Electrochemistry Communications.
2006;8(9):1435-1438. doi:10.1016/j.elecom.2006.05.032
apa: Freunberger, S. A., Reum, M., Wokaun, A., & Büchi, F. N. (2006). Expanding
current distribution measurement in PEFCs to sub-millimeter resolution. Electrochemistry
Communications. Elsevier. https://doi.org/10.1016/j.elecom.2006.05.032
chicago: Freunberger, Stefan Alexander, Mathias Reum, Alexander Wokaun, and Felix
N. Büchi. “Expanding Current Distribution Measurement in PEFCs to Sub-Millimeter
Resolution.” Electrochemistry Communications. Elsevier, 2006. https://doi.org/10.1016/j.elecom.2006.05.032.
ieee: S. A. Freunberger, M. Reum, A. Wokaun, and F. N. Büchi, “Expanding current
distribution measurement in PEFCs to sub-millimeter resolution,” Electrochemistry
Communications, vol. 8, no. 9. Elsevier, pp. 1435–1438, 2006.
ista: Freunberger SA, Reum M, Wokaun A, Büchi FN. 2006. Expanding current distribution
measurement in PEFCs to sub-millimeter resolution. Electrochemistry Communications.
8(9), 1435–1438.
mla: Freunberger, Stefan Alexander, et al. “Expanding Current Distribution Measurement
in PEFCs to Sub-Millimeter Resolution.” Electrochemistry Communications,
vol. 8, no. 9, Elsevier, 2006, pp. 1435–38, doi:10.1016/j.elecom.2006.05.032.
short: S.A. Freunberger, M. Reum, A. Wokaun, F.N. Büchi, Electrochemistry Communications
8 (2006) 1435–1438.
date_created: 2020-01-15T12:23:22Z
date_published: 2006-09-01T00:00:00Z
date_updated: 2021-01-12T08:13:06Z
day: '01'
doi: 10.1016/j.elecom.2006.05.032
extern: '1'
intvolume: ' 8'
issue: '9'
language:
- iso: eng
month: '09'
oa_version: None
page: 1435-1438
publication: Electrochemistry Communications
publication_identifier:
issn:
- 1388-2481
publication_status: published
publisher: Elsevier
quality_controlled: '1'
status: public
title: Expanding current distribution measurement in PEFCs to sub-millimeter resolution
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 8
year: '2006'
...
---
_id: '7330'
abstract:
- lang: eng
text: Polymer electrolyte fuel cells (PE fuel cells) working with air at low stoichiometries
(<2.0) and standard electrochemical components show a high degree of inhomogeneity
in the current density distribution over the active area. An inhomogeneous current
density distribution leads to a non-uniform utilization of the active area, which
could negatively affect the time of life of the cells. Furthermore, it is also
believed to lower cell performance. In this work, the homogenization of the current
density, realized by means of tailored cathodes with along-the-air-channel redistributed
catalyst loadings, is investigated. The air stoichiometry range for which a homogenization
of the current density is achieved depends upon the gradient with which the catalyst
is redistributed along the air channel. A gentle increasing catalyst loading profile
homogenizes the current density at relatively higher air stoichiometries, while
a steeper profile is suited better for lower air stoichiometries. The results
show that a homogenization of the current density by means of redistributed catalyst
loading has negative effects on cell performance. Model calculations corroborate
the experimental findings on homogenization of the current density and deliver
an explanation for the decrease in cell performance.
article_processing_charge: No
article_type: original
author:
- first_name: M.
full_name: Santis, M.
last_name: Santis
- first_name: Stefan Alexander
full_name: Freunberger, Stefan Alexander
id: A8CA28E6-CE23-11E9-AD2D-EC27E6697425
last_name: Freunberger
orcid: 0000-0003-2902-5319
- first_name: A.
full_name: Reiner, A.
last_name: Reiner
- first_name: F.N.
full_name: Büchi, F.N.
last_name: Büchi
citation:
ama: Santis M, Freunberger SA, Reiner A, Büchi FN. Homogenization of the current
density in polymer electrolyte fuel cells by in-plane cathode catalyst gradients.
Electrochimica Acta. 2006;51(25):5383-5393. doi:10.1016/j.electacta.2006.02.008
apa: Santis, M., Freunberger, S. A., Reiner, A., & Büchi, F. N. (2006). Homogenization
of the current density in polymer electrolyte fuel cells by in-plane cathode catalyst
gradients. Electrochimica Acta. Elsevier. https://doi.org/10.1016/j.electacta.2006.02.008
chicago: Santis, M., Stefan Alexander Freunberger, A. Reiner, and F.N. Büchi. “Homogenization
of the Current Density in Polymer Electrolyte Fuel Cells by In-Plane Cathode Catalyst
Gradients.” Electrochimica Acta. Elsevier, 2006. https://doi.org/10.1016/j.electacta.2006.02.008.
ieee: M. Santis, S. A. Freunberger, A. Reiner, and F. N. Büchi, “Homogenization
of the current density in polymer electrolyte fuel cells by in-plane cathode catalyst
gradients,” Electrochimica Acta, vol. 51, no. 25. Elsevier, pp. 5383–5393,
2006.
ista: Santis M, Freunberger SA, Reiner A, Büchi FN. 2006. Homogenization of the
current density in polymer electrolyte fuel cells by in-plane cathode catalyst
gradients. Electrochimica Acta. 51(25), 5383–5393.
mla: Santis, M., et al. “Homogenization of the Current Density in Polymer Electrolyte
Fuel Cells by In-Plane Cathode Catalyst Gradients.” Electrochimica Acta,
vol. 51, no. 25, Elsevier, 2006, pp. 5383–93, doi:10.1016/j.electacta.2006.02.008.
short: M. Santis, S.A. Freunberger, A. Reiner, F.N. Büchi, Electrochimica Acta 51
(2006) 5383–5393.
date_created: 2020-01-15T12:23:34Z
date_published: 2006-07-01T00:00:00Z
date_updated: 2021-01-12T08:13:07Z
day: '01'
doi: 10.1016/j.electacta.2006.02.008
extern: '1'
intvolume: ' 51'
issue: '25'
language:
- iso: eng
month: '07'
oa_version: None
page: 5383-5393
publication: Electrochimica Acta
publication_identifier:
issn:
- 0013-4686
publication_status: published
publisher: Elsevier
quality_controlled: '1'
status: public
title: Homogenization of the current density in polymer electrolyte fuel cells by
in-plane cathode catalyst gradients
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 51
year: '2006'
...
---
_id: '7331'
abstract:
- lang: eng
text: A previously developed mathematical model for water management and current
density distribution in a polymer electrolyte fuel cell (PEFCs) is employed to
investigate the effects of cooling strategies on cell performance. The model describes
a two-dimensional slice through the cell along the channels and through the entire
cell sandwich including the coolant channels and the bipolar plate. Arbitrary
flow arrangements of fuel, oxidant, and coolant stream directions can be described.
Due to the serious impact of temperature on all processes in the PEFC, both the
relative direction of the coolant stream to the gas streams and its mass flow
turns out to significantly affect the cell performance. Besides influencing the
electrochemical reaction and all kinds of mass transfer temperature, variations
predominantly alter the local membrane hydration distribution and subseqently
its conductivity.
article_number: A909
article_processing_charge: No
article_type: original
author:
- first_name: Stefan Alexander
full_name: Freunberger, Stefan Alexander
id: A8CA28E6-CE23-11E9-AD2D-EC27E6697425
last_name: Freunberger
orcid: 0000-0003-2902-5319
- first_name: Alexander
full_name: Wokaun, Alexander
last_name: Wokaun
- first_name: Felix N.
full_name: Büchi, Felix N.
last_name: Büchi
citation:
ama: 'Freunberger SA, Wokaun A, Büchi FN. In-plane effects in large-scale PEFCs:
II. The influence of cooling strategy on cell performance. Journal of The Electrochemical
Society. 2006;153(5). doi:10.1149/1.2185282'
apa: 'Freunberger, S. A., Wokaun, A., & Büchi, F. N. (2006). In-plane effects
in large-scale PEFCs: II. The influence of cooling strategy on cell performance.
Journal of The Electrochemical Society. The Electrochemical Society. https://doi.org/10.1149/1.2185282'
chicago: 'Freunberger, Stefan Alexander, Alexander Wokaun, and Felix N. Büchi.
“In-Plane Effects in Large-Scale PEFCs: II. The Influence of Cooling Strategy
on Cell Performance.” Journal of The Electrochemical Society. The Electrochemical
Society, 2006. https://doi.org/10.1149/1.2185282.'
ieee: 'S. A. Freunberger, A. Wokaun, and F. N. Büchi, “In-plane effects in large-scale
PEFCs: II. The influence of cooling strategy on cell performance,” Journal
of The Electrochemical Society, vol. 153, no. 5. The Electrochemical Society,
2006.'
ista: 'Freunberger SA, Wokaun A, Büchi FN. 2006. In-plane effects in large-scale
PEFCs: II. The influence of cooling strategy on cell performance. Journal of The
Electrochemical Society. 153(5), A909.'
mla: 'Freunberger, Stefan Alexander, et al. “In-Plane Effects in Large-Scale PEFCs:
II. The Influence of Cooling Strategy on Cell Performance.” Journal of The
Electrochemical Society, vol. 153, no. 5, A909, The Electrochemical Society,
2006, doi:10.1149/1.2185282.'
short: S.A. Freunberger, A. Wokaun, F.N. Büchi, Journal of The Electrochemical
Society 153 (2006).
date_created: 2020-01-15T12:23:46Z
date_published: 2006-03-27T00:00:00Z
date_updated: 2021-01-12T08:13:08Z
day: '27'
doi: 10.1149/1.2185282
extern: '1'
intvolume: ' 153'
issue: '5'
language:
- iso: eng
month: '03'
oa_version: None
publication: Journal of The Electrochemical Society
publication_identifier:
issn:
- 0013-4651
publication_status: published
publisher: The Electrochemical Society
quality_controlled: '1'
status: public
title: 'In-plane effects in large-scale PEFCs: II. The influence of cooling strategy
on cell performance'
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 153
year: '2006'
...
---
_id: '7332'
abstract:
- lang: eng
text: A quasi-two-dimensional, along-the-channel mass and heat-transfer model for
a proton exchange membrane fuel cell (PEFC) is described and validated against
experimental current distribution data. The model is formulated in a dimensional
manner, i.e., local transport phenomena are treated one-dimensional in through-plane
direction and coupled in-plane by convective transport in the gas and coolant
channels. Thus, a two-dimensional slice running through the repetitive unit of
a cell from the anode channel via membrane-electrode assembly (MEA) and cathode
channel to the coolant channel and from inlet to outlet is modeled. The aim of
the work is to elucidate the influence of operating conditions such as feed gas
humidities and stoichiometric ratios on the along-the-channel current density
distribution and to identify the distinct underlying voltage loss mechanisms.
Furthermore, a complicated technical flow field is modeled by a combination of
co- and counterflow subdomains and compared with experimental current densities.
article_number: A396
article_processing_charge: No
article_type: original
author:
- first_name: Stefan Alexander
full_name: Freunberger, Stefan Alexander
id: A8CA28E6-CE23-11E9-AD2D-EC27E6697425
last_name: Freunberger
orcid: 0000-0003-2902-5319
- first_name: Marco
full_name: Santis, Marco
last_name: Santis
- first_name: Ingo A.
full_name: Schneider, Ingo A.
last_name: Schneider
- first_name: Alexander
full_name: Wokaun, Alexander
last_name: Wokaun
- first_name: Felix N.
full_name: Büchi, Felix N.
last_name: Büchi
citation:
ama: Freunberger SA, Santis M, Schneider IA, Wokaun A, Büchi FN. In-plane effects
in large-scale PEMFCs. Journal of The Electrochemical Society. 2006;153(2).
doi:10.1149/1.2150150
apa: Freunberger, S. A., Santis, M., Schneider, I. A., Wokaun, A., & Büchi,
F. N. (2006). In-plane effects in large-scale PEMFCs. Journal of The Electrochemical
Society. The Electrochemical Society. https://doi.org/10.1149/1.2150150
chicago: Freunberger, Stefan Alexander, Marco Santis, Ingo A. Schneider, Alexander
Wokaun, and Felix N. Büchi. “In-Plane Effects in Large-Scale PEMFCs.” Journal
of The Electrochemical Society. The Electrochemical Society, 2006. https://doi.org/10.1149/1.2150150.
ieee: S. A. Freunberger, M. Santis, I. A. Schneider, A. Wokaun, and F. N. Büchi,
“In-plane effects in large-scale PEMFCs,” Journal of The Electrochemical Society,
vol. 153, no. 2. The Electrochemical Society, 2006.
ista: Freunberger SA, Santis M, Schneider IA, Wokaun A, Büchi FN. 2006. In-plane
effects in large-scale PEMFCs. Journal of The Electrochemical Society. 153(2),
A396.
mla: Freunberger, Stefan Alexander, et al. “In-Plane Effects in Large-Scale PEMFCs.”
Journal of The Electrochemical Society, vol. 153, no. 2, A396, The Electrochemical
Society, 2006, doi:10.1149/1.2150150.
short: S.A. Freunberger, M. Santis, I.A. Schneider, A. Wokaun, F.N. Büchi, Journal
of The Electrochemical Society 153 (2006).
date_created: 2020-01-15T12:24:00Z
date_published: 2006-01-04T00:00:00Z
date_updated: 2021-01-12T08:13:08Z
day: '04'
doi: 10.1149/1.2150150
extern: '1'
intvolume: ' 153'
issue: '2'
language:
- iso: eng
month: '01'
oa_version: None
publication: Journal of The Electrochemical Society
publication_identifier:
issn:
- 0013-4651
publication_status: published
publisher: The Electrochemical Society
quality_controlled: '1'
status: public
title: In-plane effects in large-scale PEMFCs
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 153
year: '2006'
...
---
_id: '3431'
abstract:
- lang: eng
text: Ising models with pairwise interactions are the least structured, or maximum-entropy,
probability distributions that exactly reproduce measured pairwise correlations
between spins. Here we use this equivalence to construct Ising models that describe
the correlated spiking activity of populations of 40 neurons in the retina, and
show that pairwise interactions account for observed higher-order correlations.
By first finding a representative ensemble for observed networks we can create
synthetic networks of 120 neurons, and find that with increasing size the networks
operate closer to a critical point and start exhibiting collective behaviors reminiscent
of spin glasses.
author:
- first_name: Gasper
full_name: Gasper Tkacik
id: 3D494DCA-F248-11E8-B48F-1D18A9856A87
last_name: Tkacik
orcid: 0000-0002-6699-1455
- first_name: E.
full_name: Schneidman, E.
last_name: Schneidman
- first_name: M.
full_name: Berry, M. J.
last_name: Berry
- first_name: William
full_name: Bialek, William S
last_name: Bialek
citation:
ama: Tkačik G, Schneidman E, Berry M, Bialek W. Ising models for networks of real
neurons. ArXiv. 2006:1-4.
apa: Tkačik, G., Schneidman, E., Berry, M., & Bialek, W. (2006). Ising models
for networks of real neurons. ArXiv. ArXiv.
chicago: Tkačik, Gašper, E. Schneidman, M. Berry, and William Bialek. “Ising Models
for Networks of Real Neurons.” ArXiv. ArXiv, 2006.
ieee: G. Tkačik, E. Schneidman, M. Berry, and W. Bialek, “Ising models for networks
of real neurons,” ArXiv. ArXiv, pp. 1–4, 2006.
ista: Tkačik G, Schneidman E, Berry M, Bialek W. 2006. Ising models for networks
of real neurons. ArXiv, 1–4, .
mla: Tkačik, Gašper, et al. “Ising Models for Networks of Real Neurons.” ArXiv,
ArXiv, 2006, pp. 1–4.
short: G. Tkačik, E. Schneidman, M. Berry, W. Bialek, ArXiv (2006) 1–4.
date_created: 2018-12-11T12:03:18Z
date_published: 2006-11-22T00:00:00Z
date_updated: 2021-01-12T07:43:25Z
day: '22'
extern: 1
main_file_link:
- open_access: '1'
url: http://arxiv.org/abs/q-bio/0611072
month: '11'
oa: 1
page: 1 - 4
publication: ArXiv
publication_status: published
publisher: ArXiv
publist_id: '2969'
quality_controlled: 0
status: public
title: Ising models for networks of real neurons
type: preprint
year: '2006'
...
---
_id: '3437'
abstract:
- lang: eng
text: The mutational landscape model is a theoretical model describing sequence
evolution in natural populations. However, recent experimental work has begun
to test its predictions in laboratory populations of microbes. Several of these
studies have focused on testing the prediction that the effects of beneficial
mutations should be roughly exponentially distributed. The prediction appears
to be borne out by most of these studies, at least qualitatively. Another study
showed that a modified version of the model was able to predict, with reasonable
accuracy, which of a ranked set of beneficial alleles will be fixed next. Although
it remains to be seen whether the mutational landscape model adequately describes
adaptation in organisms other than microbes, together these studies suggest that
adaptive evolution has surprisingly general properties that can be successfully
captured by theoretical models.
author:
- first_name: Andrea
full_name: Betancourt, Andrea J
last_name: Betancourt
- first_name: Jonathan P
full_name: Jonathan Bollback
id: 2C6FA9CC-F248-11E8-B48F-1D18A9856A87
last_name: Bollback
orcid: 0000-0002-4624-4612
citation:
ama: 'Betancourt A, Bollback JP. Fitness effects of beneficial mutations: the mutational
landscape model in experimental evolution. Current Opinion in Genetics &
Development. 2006;16(6):618-623. doi:10.1016/j.gde.2006.10.006'
apa: 'Betancourt, A., & Bollback, J. P. (2006). Fitness effects of beneficial
mutations: the mutational landscape model in experimental evolution. Current
Opinion in Genetics & Development. Elsevier. https://doi.org/10.1016/j.gde.2006.10.006'
chicago: 'Betancourt, Andrea, and Jonathan P Bollback. “Fitness Effects of Beneficial
Mutations: The Mutational Landscape Model in Experimental Evolution.” Current
Opinion in Genetics & Development. Elsevier, 2006. https://doi.org/10.1016/j.gde.2006.10.006.'
ieee: 'A. Betancourt and J. P. Bollback, “Fitness effects of beneficial mutations:
the mutational landscape model in experimental evolution,” Current Opinion
in Genetics & Development, vol. 16, no. 6. Elsevier, pp. 618–623, 2006.'
ista: 'Betancourt A, Bollback JP. 2006. Fitness effects of beneficial mutations:
the mutational landscape model in experimental evolution. Current Opinion in Genetics
& Development. 16(6), 618–623.'
mla: 'Betancourt, Andrea, and Jonathan P. Bollback. “Fitness Effects of Beneficial
Mutations: The Mutational Landscape Model in Experimental Evolution.” Current
Opinion in Genetics & Development, vol. 16, no. 6, Elsevier, 2006, pp.
618–23, doi:10.1016/j.gde.2006.10.006.'
short: A. Betancourt, J.P. Bollback, Current Opinion in Genetics & Development
16 (2006) 618–623.
date_created: 2018-12-11T12:03:19Z
date_published: 2006-12-01T00:00:00Z
date_updated: 2021-01-12T07:43:27Z
day: '01'
doi: 10.1016/j.gde.2006.10.006
extern: 1
intvolume: ' 16'
issue: '6'
month: '12'
page: 618 - 623
publication: Current Opinion in Genetics & Development
publication_status: published
publisher: Elsevier
publist_id: '2963'
quality_controlled: 0
status: public
title: 'Fitness effects of beneficial mutations: the mutational landscape model in
experimental evolution'
type: journal_article
volume: 16
year: '2006'
...
---
_id: '3449'
abstract:
- lang: eng
text: We argue that games are expressive enough to encompass (history-based) access
control, (resource) usage control (e.g., dynamic adaptive access control of reputation
systems), accountability based controls (e.g., insurance), controls derived from
rationality assumptions on participants (e.g., network mechanisms), and their
composition. Building on the extensive research into games, we demonstrate that
this expressive power coexists with a formal analysis framework comparable to
that available for access control.
author:
- first_name: Krishnendu
full_name: Krishnendu Chatterjee
id: 2E5DCA20-F248-11E8-B48F-1D18A9856A87
last_name: Chatterjee
orcid: 0000-0002-4561-241X
- first_name: Rhada
full_name: Jagadeesan, Rhada
last_name: Jagadeesan
- first_name: Corin
full_name: Pitcher, Corin
last_name: Pitcher
citation:
ama: 'Chatterjee K, Jagadeesan R, Pitcher C. Games for controls. In: IEEE; 2006:70-82.
doi:10.1109/CSFW.2006.14'
apa: 'Chatterjee, K., Jagadeesan, R., & Pitcher, C. (2006). Games for controls
(pp. 70–82). Presented at the CSF: Computer Security Foundations, IEEE. https://doi.org/10.1109/CSFW.2006.14'
chicago: Chatterjee, Krishnendu, Rhada Jagadeesan, and Corin Pitcher. “Games for
Controls,” 70–82. IEEE, 2006. https://doi.org/10.1109/CSFW.2006.14.
ieee: 'K. Chatterjee, R. Jagadeesan, and C. Pitcher, “Games for controls,” presented
at the CSF: Computer Security Foundations, 2006, pp. 70–82.'
ista: 'Chatterjee K, Jagadeesan R, Pitcher C. 2006. Games for controls. CSF: Computer
Security Foundations, 70–82.'
mla: Chatterjee, Krishnendu, et al. Games for Controls. IEEE, 2006, pp. 70–82,
doi:10.1109/CSFW.2006.14.
short: K. Chatterjee, R. Jagadeesan, C. Pitcher, in:, IEEE, 2006, pp. 70–82.
conference:
name: 'CSF: Computer Security Foundations'
date_created: 2018-12-11T12:03:23Z
date_published: 2006-07-31T00:00:00Z
date_updated: 2021-01-12T07:43:32Z
day: '31'
doi: 10.1109/CSFW.2006.14
extern: 1
month: '07'
page: 70 - 82
publication_status: published
publisher: IEEE
publist_id: '2938'
quality_controlled: 0
status: public
title: Games for controls
type: conference
year: '2006'
...
---
_id: '3463'
abstract:
- lang: eng
text: It is widely accepted that the hippocampus plays a major role in learning
and memory. The mossy fiber synapse between granule cells in the dentate gyrus
and pyramidal neurons in the CA3 region is a key component of the hippocampal
trisynaptic circuit. Recent work, partially based on direct presynaptic patch-clamp
recordings from hippocampal mossy fiber boutons, sheds light on the mechanisms
of synaptic transmission and plasticity at mossy fiber synapses. A high Na(+)
channel density in mossy fiber boutons leads to a large amplitude of the presynaptic
action potential. Together with the fast gating of presynaptic Ca(2+) channels,
this generates a large and brief presynaptic Ca(2+) influx, which can trigger
transmitter release with high efficiency and temporal precision. The large number
of release sites, the large size of the releasable pool of vesicles, and the huge
extent of presynaptic plasticity confer unique strength to this synapse, suggesting
a large impact onto the CA3 pyramidal cell network under specific behavioral conditions.
The characteristic properties of the hippocampal mossy fiber synapse may be important
for pattern separation and information storage in the dentate gyrus-CA3 cell network.
author:
- first_name: Joseph
full_name: Bischofberger, Joseph
last_name: Bischofberger
- first_name: Dominique
full_name: Engel, Dominique
last_name: Engel
- first_name: Michael
full_name: Frotscher, Michael
last_name: Frotscher
- first_name: Peter M
full_name: Peter Jonas
id: 353C1B58-F248-11E8-B48F-1D18A9856A87
last_name: Jonas
orcid: 0000-0001-5001-4804
citation:
ama: 'Bischofberger J, Engel D, Frotscher M, Jonas PM. Timing and efficacy of transmitter
release at mossy fiber synapses in the hippocampal network. (Review). Pflugers
Archiv : European Journal of Physiology. 2006;453(3):361-372. doi:10.1007/s00424-006-0093-2'
apa: 'Bischofberger, J., Engel, D., Frotscher, M., & Jonas, P. M. (2006). Timing
and efficacy of transmitter release at mossy fiber synapses in the hippocampal
network. (Review). Pflugers Archiv : European Journal of Physiology. Springer.
https://doi.org/10.1007/s00424-006-0093-2'
chicago: 'Bischofberger, Joseph, Dominique Engel, Michael Frotscher, and Peter M
Jonas. “Timing and Efficacy of Transmitter Release at Mossy Fiber Synapses in
the Hippocampal Network. (Review).” Pflugers Archiv : European Journal of Physiology.
Springer, 2006. https://doi.org/10.1007/s00424-006-0093-2.'
ieee: 'J. Bischofberger, D. Engel, M. Frotscher, and P. M. Jonas, “Timing and efficacy
of transmitter release at mossy fiber synapses in the hippocampal network. (Review),”
Pflugers Archiv : European Journal of Physiology, vol. 453, no. 3. Springer,
pp. 361–372, 2006.'
ista: 'Bischofberger J, Engel D, Frotscher M, Jonas PM. 2006. Timing and efficacy
of transmitter release at mossy fiber synapses in the hippocampal network. (Review).
Pflugers Archiv : European Journal of Physiology. 453(3), 361–372.'
mla: 'Bischofberger, Joseph, et al. “Timing and Efficacy of Transmitter Release
at Mossy Fiber Synapses in the Hippocampal Network. (Review).” Pflugers Archiv :
European Journal of Physiology, vol. 453, no. 3, Springer, 2006, pp. 361–72,
doi:10.1007/s00424-006-0093-2.'
short: 'J. Bischofberger, D. Engel, M. Frotscher, P.M. Jonas, Pflugers Archiv :
European Journal of Physiology 453 (2006) 361–372.'
date_created: 2018-12-11T12:03:28Z
date_published: 2006-12-01T00:00:00Z
date_updated: 2019-04-26T07:22:28Z
day: '01'
doi: 10.1007/s00424-006-0093-2
extern: 1
intvolume: ' 453'
issue: '3'
month: '12'
page: 361 - 372
publication: 'Pflugers Archiv : European Journal of Physiology'
publication_status: published
publisher: Springer
publist_id: '2924'
quality_controlled: 0
status: public
title: Timing and efficacy of transmitter release at mossy fiber synapses in the hippocampal
network. (Review)
type: review
volume: 453
year: '2006'
...
---
_id: '3499'
abstract:
- lang: eng
text: 'We study infinite stochastic games played by n-players on a finite graph
with goals specified by sets of infinite traces. The games are concurrent (each
player simultaneously and independently chooses an action at each round), stochastic
(the next state is determined by a probability distribution depending on the current
state and the chosen actions), infinite (the game continues for an infinite number
of rounds), nonzero-sum (the players’ goals are not necessarily conflicting),
and undiscounted. We show that if each player has an upward-closed objective,
then there exists an ε-Nash equilibrium in memoryless strategies, for every ε>0;
and exact Nash equilibria need not exist. Upward-closure of an objective means
that if a set Z of infinitely repeating states is winning, then all supersets
of Z of infinitely repeating states are also winning. Memoryless strategies are
strategies that are independent of history of plays and depend only on the current
state. We also study the complexity of finding values (payoff profile) of an ε-Nash
equilibrium. We show that the values of an ε-Nash equilibrium in nonzero-sum concurrent
games with upward-closed objectives for all players can be computed by computing
ε-Nash equilibrium values of nonzero-sum concurrent games with reachability objectives
for all players and a polynomial procedure. As a consequence we establish that
values of an ε-Nash equilibrium can be computed in TFNP (total functional NP),
and hence in EXPTIME. '
acknowledgement: This research was supported in part by the NSF grants CCR-0225610
and CCR- 0234690, and by the SNSF under the Indo-Swiss Joint Research Programme.
alternative_title:
- 'LNCS '
author:
- first_name: Krishnendu
full_name: Krishnendu Chatterjee
id: 2E5DCA20-F248-11E8-B48F-1D18A9856A87
last_name: Chatterjee
orcid: 0000-0002-4561-241X
citation:
ama: 'Chatterjee K. Nash equilibrium for upward-closed objectives. In: Vol 4207.
Springer; 2006:271-286. doi:10.1007/11874683_18'
apa: 'Chatterjee, K. (2006). Nash equilibrium for upward-closed objectives (Vol.
4207, pp. 271–286). Presented at the CSL: Computer Science Logic, Springer. https://doi.org/10.1007/11874683_18'
chicago: Chatterjee, Krishnendu. “Nash Equilibrium for Upward-Closed Objectives,”
4207:271–86. Springer, 2006. https://doi.org/10.1007/11874683_18.
ieee: 'K. Chatterjee, “Nash equilibrium for upward-closed objectives,” presented
at the CSL: Computer Science Logic, 2006, vol. 4207, pp. 271–286.'
ista: 'Chatterjee K. 2006. Nash equilibrium for upward-closed objectives. CSL: Computer
Science Logic, LNCS , vol. 4207, 271–286.'
mla: Chatterjee, Krishnendu. Nash Equilibrium for Upward-Closed Objectives.
Vol. 4207, Springer, 2006, pp. 271–86, doi:10.1007/11874683_18.
short: K. Chatterjee, in:, Springer, 2006, pp. 271–286.
conference:
name: 'CSL: Computer Science Logic'
date_created: 2018-12-11T12:03:39Z
date_published: 2006-09-28T00:00:00Z
date_updated: 2021-01-12T07:43:52Z
day: '28'
doi: 10.1007/11874683_18
extern: 1
intvolume: ' 4207'
month: '09'
page: 271 - 286
publication_status: published
publisher: Springer
publist_id: '2888'
quality_controlled: 0
status: public
title: Nash equilibrium for upward-closed objectives
type: conference
volume: 4207
year: '2006'
...
---
_id: '3500'
abstract:
- lang: eng
text: The classical algorithm for solving Bu ̈chi games requires time O(n · m) for
game graphs with n states and m edges. For game graphs with constant outdegree,
the best known algorithm has running time O(n2/logn). We present two new algorithms
for Bu ̈chi games. First, we give an algorithm that performs at most O(m) more
work than the classical algorithm, but runs in time O(n) on infinitely many graphs
of constant outdegree on which the classical algorithm requires time O(n2). Second,
we give an algorithm with running time O(n · m · log δ(n)/ log n), where 1 ≤ δ(n)
≤ n is the outdegree of the game graph. Note that this algorithm performs asymptotically
better than the classical algorithm if δ(n) = O(log n).
acknowledgement: This research was supported in part by the AFOSR MURI grant F49620-00-1-0327
and the NSF ITR grant CCR-0225610 and the SNSF under the Indo-Swiss Joint Research
Programme.
author:
- first_name: Krishnendu
full_name: Krishnendu Chatterjee
id: 2E5DCA20-F248-11E8-B48F-1D18A9856A87
last_name: Chatterjee
orcid: 0000-0002-4561-241X
- first_name: Thomas A
full_name: Thomas Henzinger
id: 40876CD8-F248-11E8-B48F-1D18A9856A87
last_name: Henzinger
orcid: 0000−0002−2985−7724
- first_name: Nir
full_name: Piterman, Nir
last_name: Piterman
citation:
ama: 'Chatterjee K, Henzinger TA, Piterman N. Algorithms for Büchi Games. In: ACM;
2006.'
apa: 'Chatterjee, K., Henzinger, T. A., & Piterman, N. (2006). Algorithms for
Büchi Games. Presented at the GDV: Games in Design and Verification, ACM.'
chicago: Chatterjee, Krishnendu, Thomas A Henzinger, and Nir Piterman. “Algorithms
for Büchi Games.” ACM, 2006.
ieee: 'K. Chatterjee, T. A. Henzinger, and N. Piterman, “Algorithms for Büchi Games,”
presented at the GDV: Games in Design and Verification, 2006.'
ista: 'Chatterjee K, Henzinger TA, Piterman N. 2006. Algorithms for Büchi Games.
GDV: Games in Design and Verification.'
mla: Chatterjee, Krishnendu, et al. Algorithms for Büchi Games. ACM, 2006.
short: K. Chatterjee, T.A. Henzinger, N. Piterman, in:, ACM, 2006.
conference:
name: 'GDV: Games in Design and Verification'
date_created: 2018-12-11T12:03:39Z
date_published: 2006-08-21T00:00:00Z
date_updated: 2021-01-12T07:43:53Z
day: '21'
extern: 1
main_file_link:
- open_access: '0'
url: http://www.cs.le.ac.uk/people/np183/publications/2006/CHP06.pdf
month: '08'
publication_status: published
publisher: ACM
publist_id: '2887'
quality_controlled: 0
status: public
title: Algorithms for Büchi Games
type: conference
year: '2006'
...