---
_id: '1299'
abstract:
- lang: eng
text: Recent experiments have shown that motion detection in Drosophila starts with
splitting the visual input into two parallel channels encoding brightness increments
(ON) or decrements (OFF). This suggests the existence of either two (ON-ON, OFF-OFF)
or four (for all pairwise interactions) separate motion detectors. To decide between
these possibilities, we stimulated flies using sequences of ON and OFF brightness
pulses while recording from motion-sensitive tangential cells. We found direction-selective
responses to sequences of same sign (ON-ON, OFF-OFF), but not of opposite sign
(ON-OFF, OFF-ON), refuting the existence of four separate detectors. Based on
further measurements, we propose a model that reproduces a variety of additional
experimental data sets, including ones that were previously interpreted as support
for four separate detectors. Our experiments and the derived model mark an important
step in guiding further dissection of the fly motion detection circuit.
author:
- first_name: Hubert
full_name: Eichner, Hubert
last_name: Eichner
- first_name: Maximilian A
full_name: Maximilian Jösch
id: 2BD278E6-F248-11E8-B48F-1D18A9856A87
last_name: Jösch
orcid: 0000-0002-3937-1330
- first_name: Bettina
full_name: Schnell, Bettina
last_name: Schnell
- first_name: Dierk
full_name: Reiff, Dierk F
last_name: Reiff
- first_name: Alexander
full_name: Borst, Alexander
last_name: Borst
citation:
ama: Eichner H, Jösch MA, Schnell B, Reiff D, Borst A. Internal structure of the
fly elementary motion detector. Neuron. 2011;70(6):1155-1164. doi:10.1016/j.neuron.2011.03.028
apa: Eichner, H., Jösch, M. A., Schnell, B., Reiff, D., & Borst, A. (2011).
Internal structure of the fly elementary motion detector. Neuron. Elsevier.
https://doi.org/10.1016/j.neuron.2011.03.028
chicago: Eichner, Hubert, Maximilian A Jösch, Bettina Schnell, Dierk Reiff, and
Alexander Borst. “Internal Structure of the Fly Elementary Motion Detector.” Neuron.
Elsevier, 2011. https://doi.org/10.1016/j.neuron.2011.03.028.
ieee: H. Eichner, M. A. Jösch, B. Schnell, D. Reiff, and A. Borst, “Internal structure
of the fly elementary motion detector,” Neuron, vol. 70, no. 6. Elsevier,
pp. 1155–1164, 2011.
ista: Eichner H, Jösch MA, Schnell B, Reiff D, Borst A. 2011. Internal structure
of the fly elementary motion detector. Neuron. 70(6), 1155–1164.
mla: Eichner, Hubert, et al. “Internal Structure of the Fly Elementary Motion Detector.”
Neuron, vol. 70, no. 6, Elsevier, 2011, pp. 1155–64, doi:10.1016/j.neuron.2011.03.028.
short: H. Eichner, M.A. Jösch, B. Schnell, D. Reiff, A. Borst, Neuron 70 (2011)
1155–1164.
date_created: 2018-12-11T11:51:14Z
date_published: 2011-06-23T00:00:00Z
date_updated: 2021-01-12T06:49:43Z
day: '23'
doi: 10.1016/j.neuron.2011.03.028
extern: 1
intvolume: ' 70'
issue: '6'
month: '06'
page: 1155 - 1164
publication: Neuron
publication_status: published
publisher: Elsevier
publist_id: '5969'
quality_controlled: 0
status: public
title: Internal structure of the fly elementary motion detector
type: journal_article
volume: 70
year: '2011'
...
---
_id: '1467'
abstract:
- lang: eng
text: We propose a general conjecture for the mixed Hodge polynomial of the generic
character varieties of representations of the fundamental group of a Riemann surface
of genus g to GLn(C) with fixed generic semisimple conjugacy classes at k punctures.
This conjecture generalizes the Cauchy identity for Macdonald polynomials and
is a common generalization of two formulas that we prove in this paper. The first
is a formula for the E-polynomial of these character varieties which we obtain
using the character table of GLn(Fq). We use this formula to compute the Euler
characteristic of character varieties. The second formula gives the Poincaré polynomial
of certain associated quiver varieties which we obtain using the character table
of gln(Fq). In the last main result we prove that the Poincaré polynomials of
the quiver varieties equal certain multiplicities in the tensor product of irreducible
characters of GLn(Fq). As a consequence we find a curious connection between Kac-Moody
algebras associated with comet-shaped, and typically wild, quivers and the representation
theory of GLn(Fq).
acknowledgement: |-
Hausel’s work was supported by National Science Foundation grants DMS-0305505 and DMS-0604775, by an Alfred Sloan Fellowship, and by a Royal Society University Research Fellowship. Letellier’s work supported by Agence Nationale de la Recherche grant ANR-09-JCJC-0102-01.
Rodriguez-Villegas’s work supported by National Science Foundation grant DMS-0200605, by an FRA from the University of Texas at Austin, by EPSRC grant EP/G027110/1, by visiting fellowships at All Souls and Wadham Colleges in Oxford, and by a Research Scholarship from the Clay Mathematical Institute.
author:
- first_name: Tamas
full_name: Tamas Hausel
id: 4A0666D8-F248-11E8-B48F-1D18A9856A87
last_name: Hausel
- first_name: Emmanuel
full_name: Letellier, Emmanuel
last_name: Letellier
- first_name: Fernando
full_name: Rodríguez Villegas, Fernando
last_name: Rodríguez Villegas
citation:
ama: Hausel T, Letellier E, Rodríguez Villegas F. Arithmetic harmonic analysis on
character and quiver varieties. Duke Mathematical Journal. 2011;160(2):323-400.
doi:10.1215/00127094-1444258
apa: Hausel, T., Letellier, E., & Rodríguez Villegas, F. (2011). Arithmetic
harmonic analysis on character and quiver varieties. Duke Mathematical Journal.
Duke University Press. https://doi.org/10.1215/00127094-1444258
chicago: Hausel, Tamás, Emmanuel Letellier, and Fernando Rodríguez Villegas. “Arithmetic
Harmonic Analysis on Character and Quiver Varieties.” Duke Mathematical Journal.
Duke University Press, 2011. https://doi.org/10.1215/00127094-1444258.
ieee: T. Hausel, E. Letellier, and F. Rodríguez Villegas, “Arithmetic harmonic analysis
on character and quiver varieties,” Duke Mathematical Journal, vol. 160,
no. 2. Duke University Press, pp. 323–400, 2011.
ista: Hausel T, Letellier E, Rodríguez Villegas F. 2011. Arithmetic harmonic analysis
on character and quiver varieties. Duke Mathematical Journal. 160(2), 323–400.
mla: Hausel, Tamás, et al. “Arithmetic Harmonic Analysis on Character and Quiver
Varieties.” Duke Mathematical Journal, vol. 160, no. 2, Duke University
Press, 2011, pp. 323–400, doi:10.1215/00127094-1444258.
short: T. Hausel, E. Letellier, F. Rodríguez Villegas, Duke Mathematical Journal
160 (2011) 323–400.
date_created: 2018-12-11T11:52:11Z
date_published: 2011-01-01T00:00:00Z
date_updated: 2021-01-12T06:50:56Z
day: '01'
doi: 10.1215/00127094-1444258
extern: 1
intvolume: ' 160'
issue: '2'
main_file_link:
- open_access: '1'
url: http://arxiv.org/abs/0810.2076
month: '01'
oa: 1
page: 323 - 400
publication: Duke Mathematical Journal
publication_status: published
publisher: Duke University Press
publist_id: '5728'
quality_controlled: 0
status: public
title: Arithmetic harmonic analysis on character and quiver varieties
type: journal_article
volume: 160
year: '2011'
...
---
_id: '1723'
abstract:
- lang: eng
text: The emergence of differences in the arrangement of cells is the first step
towards the establishment of many organs. Understanding this process is limited
by the lack of systematic characterization of epithelial organisation. Here we
apply network theory at the scale of individual cells to uncover patterns in cell-to-cell
contacts that govern epithelial organisation. We provide an objective characterisation
of epithelia using network representation, where cells are nodes and cell contacts
are links. The features of individual cells, together with attributes of the cellular
network, produce a defining signature that distinguishes epithelia from different
organs, species, developmental stages and genetic conditions. The approach permits
characterization, quantification and classification of normal and perturbed epithelia,
and establishes a framework for understanding molecular mechanisms that underpin
the architecture of complex tissues.
acknowledgement: We acknowledge the MRC for funding, M.M.B. acknowledges Darwin College,
EMBO YIP and Schlumberger Ltd for support. L.M.E. is funded by the Marie Curie and
the EMBO fellowships. L.d.F.C. is grateful to FAPESP (05/00587-5) and CNPq (301303/06-1)
for financial support. Part of this work was performed during a Visiting Scholarship
to L.d.F.C. from St Catharine's College, University of Cambridge. J.B. is supported
by the MRC (UK) and A.K. by a FEBS fellowship
author:
- first_name: Luis
full_name: Escudero, Luis M
last_name: Escudero
- first_name: Luciano
full_name: Costa, Luciano
last_name: Costa
- first_name: Anna
full_name: Anna Kicheva
id: 3959A2A0-F248-11E8-B48F-1D18A9856A87
last_name: Kicheva
orcid: 0000-0003-4509-4998
- first_name: James
full_name: Briscoe, James
last_name: Briscoe
- first_name: Matthew
full_name: Freeman, Matthew
last_name: Freeman
- first_name: Madan
full_name: Babu, Madan M
last_name: Babu
citation:
ama: Escudero L, Costa L, Kicheva A, Briscoe J, Freeman M, Babu M. Epithelial organisation
revealed by a network of cellular contacts. Nature Communications. 2011;2(1).
doi:10.1038/ncomms1536
apa: Escudero, L., Costa, L., Kicheva, A., Briscoe, J., Freeman, M., & Babu,
M. (2011). Epithelial organisation revealed by a network of cellular contacts.
Nature Communications. Nature Publishing Group. https://doi.org/10.1038/ncomms1536
chicago: Escudero, Luis, Luciano Costa, Anna Kicheva, James Briscoe, Matthew Freeman,
and Madan Babu. “Epithelial Organisation Revealed by a Network of Cellular Contacts.”
Nature Communications. Nature Publishing Group, 2011. https://doi.org/10.1038/ncomms1536.
ieee: L. Escudero, L. Costa, A. Kicheva, J. Briscoe, M. Freeman, and M. Babu, “Epithelial
organisation revealed by a network of cellular contacts,” Nature Communications,
vol. 2, no. 1. Nature Publishing Group, 2011.
ista: Escudero L, Costa L, Kicheva A, Briscoe J, Freeman M, Babu M. 2011. Epithelial
organisation revealed by a network of cellular contacts. Nature Communications.
2(1).
mla: Escudero, Luis, et al. “Epithelial Organisation Revealed by a Network of Cellular
Contacts.” Nature Communications, vol. 2, no. 1, Nature Publishing Group,
2011, doi:10.1038/ncomms1536.
short: L. Escudero, L. Costa, A. Kicheva, J. Briscoe, M. Freeman, M. Babu, Nature
Communications 2 (2011).
date_created: 2018-12-11T11:53:40Z
date_published: 2011-01-01T00:00:00Z
date_updated: 2021-01-12T06:52:46Z
day: '01'
doi: 10.1038/ncomms1536
extern: 1
intvolume: ' 2'
issue: '1'
month: '01'
publication: Nature Communications
publication_status: published
publisher: Nature Publishing Group
publist_id: '5405'
quality_controlled: 0
status: public
title: Epithelial organisation revealed by a network of cellular contacts
type: journal_article
volume: 2
year: '2011'
...
---
_id: '1724'
abstract:
- lang: eng
text: Morphogens, such as Decapentaplegic (Dpp) in the fly imaginal discs, form
graded concentration profiles that control patterning and growth of developing
organs. In the imaginal discs, proliferative growth is homogeneous in space, posing
the conundrum of how morphogen concentration gradients could control position-independent
growth. To understand the mechanism of proliferation control by the Dpp gradient,
we quantified Dpp concentration and signaling levels during wing disc growth.
Both Dpp concentration and signaling gradients scale with tissue size during development.
On average, cells divide when Dpp signaling levels have increased by 50%. Our
observations are consistent with a growth control mechanism based on temporal
changes of cellular morphogen signaling levels. For a scaling gradient, this mechanism
generates position-independent growth rates.
acknowledgement: P.M., T.B., and F.J. were supported by the Max-Planck-Gesellschaft.
O.W., A.K., C.S., and M.G.-G. were supported by Geneva University and by European
Research Council advanced investigator grant (SARA), SystemsX (LipidX), Swiss National
Science Foundation (SNF), National Centre of Competence in Research (NCCR) chemical
biology and Frontiers in Genetics and R'equip grants
author:
- first_name: Ortrud
full_name: Wartlick, Ortrud
last_name: Wartlick
- first_name: Peer
full_name: Mumcu, Peer
last_name: Mumcu
- first_name: Anna
full_name: Anna Kicheva
id: 3959A2A0-F248-11E8-B48F-1D18A9856A87
last_name: Kicheva
orcid: 0000-0003-4509-4998
- first_name: Thomas
full_name: Bittig, Thomas
last_name: Bittig
- first_name: Carole
full_name: Seum, Carole
last_name: Seum
- first_name: Frank
full_name: Jülicher, Frank
last_name: Jülicher
- first_name: Marcos
full_name: González-Gaitán, Marcos A
last_name: González Gaitán
citation:
ama: Wartlick O, Mumcu P, Kicheva A, et al. Dynamics of Dpp signaling and proliferation
control. Science. 2011;331(6021):1154-1159. doi:10.1126/science.1200037
apa: Wartlick, O., Mumcu, P., Kicheva, A., Bittig, T., Seum, C., Jülicher, F., &
González Gaitán, M. (2011). Dynamics of Dpp signaling and proliferation control.
Science. American Association for the Advancement of Science. https://doi.org/10.1126/science.1200037
chicago: Wartlick, Ortrud, Peer Mumcu, Anna Kicheva, Thomas Bittig, Carole Seum,
Frank Jülicher, and Marcos González Gaitán. “Dynamics of Dpp Signaling and Proliferation
Control.” Science. American Association for the Advancement of Science,
2011. https://doi.org/10.1126/science.1200037.
ieee: O. Wartlick et al., “Dynamics of Dpp signaling and proliferation control,”
Science, vol. 331, no. 6021. American Association for the Advancement of
Science, pp. 1154–1159, 2011.
ista: Wartlick O, Mumcu P, Kicheva A, Bittig T, Seum C, Jülicher F, González Gaitán
M. 2011. Dynamics of Dpp signaling and proliferation control. Science. 331(6021),
1154–1159.
mla: Wartlick, Ortrud, et al. “Dynamics of Dpp Signaling and Proliferation Control.”
Science, vol. 331, no. 6021, American Association for the Advancement of
Science, 2011, pp. 1154–59, doi:10.1126/science.1200037.
short: O. Wartlick, P. Mumcu, A. Kicheva, T. Bittig, C. Seum, F. Jülicher, M. González
Gaitán, Science 331 (2011) 1154–1159.
date_created: 2018-12-11T11:53:40Z
date_published: 2011-03-04T00:00:00Z
date_updated: 2021-01-12T06:52:46Z
day: '04'
doi: 10.1126/science.1200037
extern: 1
intvolume: ' 331'
issue: '6021'
month: '03'
page: 1154 - 1159
publication: Science
publication_status: published
publisher: American Association for the Advancement of Science
publist_id: '5406'
quality_controlled: 0
status: public
title: Dynamics of Dpp signaling and proliferation control
type: journal_article
volume: 331
year: '2011'
...
---
_id: '1754'
abstract:
- lang: eng
text: 'We report on a technique enabling electrical control of the contact silicidation
process in silicon nanowire devices. Undoped silicon nanowires were contacted
by pairs of nickel electrodes and each contact was selectively silicided by means
of the Joule effect. By a realtime monitoring of the nanowire electrical resistance
during the contact silicidation process we were able to fabricate nickel-silicide/silicon/nickel-
silicide devices with controlled silicon channel length down to 8 nm. '
acknowledgement: This work was supported by the Agence Nationale de la Recherche (ANR)
through the ACCESS and COHESION projects and by the European Commission through
the Chemtronics program MEST-CT-2005-020513
author:
- first_name: Massimo
full_name: Mongillo, Massimo
last_name: Mongillo
- first_name: Panayotis
full_name: Spathis, Panayotis
last_name: Spathis
- first_name: Georgios
full_name: Katsaros, Georgios
id: 38DB5788-F248-11E8-B48F-1D18A9856A87
last_name: Katsaros
- first_name: Pascal
full_name: Gentile, Pascal
last_name: Gentile
- first_name: Marc
full_name: Sanquer, Marc
last_name: Sanquer
- first_name: Silvano
full_name: De Franceschi, Silvano
last_name: De Franceschi
citation:
ama: Mongillo M, Spathis P, Katsaros G, Gentile P, Sanquer M, De Franceschi S. Joule-assisted
silicidation for short-channel silicon nanowire devices. ACS Nano. 2011;5(9):7117-7123.
doi:10.1021/nn202524j
apa: Mongillo, M., Spathis, P., Katsaros, G., Gentile, P., Sanquer, M., & De
Franceschi, S. (2011). Joule-assisted silicidation for short-channel silicon nanowire
devices. ACS Nano. American Chemical Society. https://doi.org/10.1021/nn202524j
chicago: Mongillo, Massimo, Panayotis Spathis, Georgios Katsaros, Pascal Gentile,
Marc Sanquer, and Silvano De Franceschi. “Joule-Assisted Silicidation for Short-Channel
Silicon Nanowire Devices.” ACS Nano. American Chemical Society, 2011. https://doi.org/10.1021/nn202524j.
ieee: M. Mongillo, P. Spathis, G. Katsaros, P. Gentile, M. Sanquer, and S. De Franceschi,
“Joule-assisted silicidation for short-channel silicon nanowire devices,” ACS
Nano, vol. 5, no. 9. American Chemical Society, pp. 7117–7123, 2011.
ista: Mongillo M, Spathis P, Katsaros G, Gentile P, Sanquer M, De Franceschi S.
2011. Joule-assisted silicidation for short-channel silicon nanowire devices.
ACS Nano. 5(9), 7117–7123.
mla: Mongillo, Massimo, et al. “Joule-Assisted Silicidation for Short-Channel Silicon
Nanowire Devices.” ACS Nano, vol. 5, no. 9, American Chemical Society,
2011, pp. 7117–23, doi:10.1021/nn202524j.
short: M. Mongillo, P. Spathis, G. Katsaros, P. Gentile, M. Sanquer, S. De Franceschi,
ACS Nano 5 (2011) 7117–7123.
date_created: 2018-12-11T11:53:50Z
date_published: 2011-09-27T00:00:00Z
date_updated: 2021-01-12T06:52:59Z
day: '27'
doi: 10.1021/nn202524j
extern: '1'
external_id:
arxiv:
- '1110.5668'
intvolume: ' 5'
issue: '9'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: http://arxiv.org/abs/1110.5668
month: '09'
oa: 1
oa_version: Preprint
page: 7117 - 7123
publication: ACS Nano
publication_status: published
publisher: American Chemical Society
publist_id: '5370'
quality_controlled: '1'
status: public
title: Joule-assisted silicidation for short-channel silicon nanowire devices
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 5
year: '2011'
...