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Higher Genus Amplitudes on Compact Calabi-Yau and Threshold Corrections

Albrecht Klemm Rheinische Friedrich-Wilhelms-Universität Bonn

November 20, 2004 PIRSA:04110023
Phase-field model for cellular monolayers : a cancer cell migration studyauthors : Benoit Palmieri and Martin Grant

Benoit Palmieri McGill University

December 05, 2013 PIRSA:13120037
Electrophoretic Mobility within a Confining Well

Tyler Shendruk University of Ottawa

December 05, 2013 PIRSA:13120039
Dynamical simulation of disordered micelles in a diblock copolymer melt with fluctuations

Russell Spencer University of Guelph

December 05, 2013 PIRSA:13120040
Budding transition of a self-avoiding polymer confined by a soft membrane adhering onto a flat wall

Yu-Cheng Su University of Waterloo

December 05, 2013 PIRSA:13120041
Ab initio insight in supercooled water

John Tatini Titantah Western University

December 05, 2013 PIRSA:13120042
Calculating the free energy of antimicrobial peptide (HHC-36) dimerization in bulk

shaqa vafa University of Guelph

December 05, 2013 PIRSA:13120043
Strominger-Yau-Zaslow revisited

David Morrison University of California - Santa Barbara (UCSB)

November 21, 2004 PIRSA:04110024
Cohomology groups in mirror symmetry
November 21, 2004 PIRSA:04110025
13/14 PSI - Standard Model Review - Lecture 1

Paul Langacker Institute for Advanced Study (IAS)

January 06, 2014 PIRSA:14010008
13/14 PSI - Gravitational Physics Review - Lecture 1

Ruth Gregory King's College London - Department of Mathematics

January 06, 2014 PIRSA:14010027
13/14 PSI - Standard Model Review - Lecture 2

Paul Langacker Institute for Advanced Study (IAS)

January 07, 2014 PIRSA:14010009

Higher Genus Amplitudes on Compact Calabi-Yau and Threshold Corrections

Albrecht Klemm Rheinische Friedrich-Wilhelms-Universität Bonn

November 20, 2004 PIRSA:04110023
Phase-field model for cellular monolayers : a cancer cell migration studyauthors : Benoit Palmieri and Martin Grant

Benoit Palmieri McGill University

December 05, 2013 PIRSA:13120037

Recent experimental work [1] suggests that the increased motility of cancer cells observed in a confluent monolayer of normal cells is due to the mechanical mismatch between the two cell types. The soft cancer cell undergoes large deformations and can squeeze between small channels defined by the space between the normal cells. We developed a phase-field model description of cellular monolayers to study such a process. The system is setup as a free-boundary problem where each cell is a highly deformable soft body [2]. The motion of each cell is described by a persistent random walk where the velocities and persistent times can be obtained from experimental observations. Our model is used to test the hypothesis that the mechanical mismatch alone increases the motility of softer cells when all other parameters are the same.[1] Lee et al. Biophys. J. vol. 102 p. 2731 (2012).[2] Najem et al. Europhys. Lett. vol. 102 p. 16001 (2013).
Electrophoretic Mobility within a Confining Well

Tyler Shendruk University of Ottawa

December 05, 2013 PIRSA:13120039
Dynamical simulation of disordered micelles in a diblock copolymer melt with fluctuations

Russell Spencer University of Guelph

December 05, 2013 PIRSA:13120040

By including composition fluctuations in our dynamical simulation of the time-dependent Landau-Brazovskii model for a diblock copolymer melt we find that disordered micelles form above the order-disorder transition to a BCC phase. At high-temperatures the micelle number density and volume fraction are effectively zero and the melt is disordered at the molecular level. As we lower the temperature the micelle number density increases gradually and approaches the number density in the BCC phase. If we increase the strength of the fluctuations the temperature range over which disordered micelles exist broadens and the onset of BCC order is suppressed. By tracking trajectories we also investigate the dynamical behaviour of individual micelles in an environment of disordered micelles We find diffusive behaviour which we investigate as a function of temperature and micelle volume fraction.
Budding transition of a self-avoiding polymer confined by a soft membrane adhering onto a flat wall

Yu-Cheng Su University of Waterloo

December 05, 2013 PIRSA:13120041

Monte Carlo simulation is used to study the structural properties of the system consisting of a self-avoiding polymer chain confined between a fluid membrane and a flat hard surface. As the adhesion between the soft membrane and the hard-wall surface increases the polymer is subject to a strong confinement; a pancake-shaped polymer conformation state eventually yields to a bud state through an abrupt first-order phase transition. We explore the scaling behavior of the physical properties of the system as functions of the polymers size the membranes surface tension and the adhesion energy for both pancake and bud states in terms of Monte Carlo data and analytic scaling theories.
Ab initio insight in supercooled water

John Tatini Titantah Western University

December 05, 2013 PIRSA:13120042

As an extension to previous ab initio studies on water [12] we present 400 psBorn-Oppenheimer ab initio Molecular dynamics study on water at deep supercooled temperatures (down to 220 K) and confirm a crossover from a fragile to strongliquid around the Widom line. This crossover is accompanied by the passage from relatively weaker hydrogen bonds in the dominantly high density liquid (HDL) at high temperatures to strong hydrogen bond in dominantly low density liquid (LDL). This crossover is accompanied by a maximum in the excess specific heat at constant volume and may lend further support to the existence of a liquid-liquid critical point (LLCP) in supercooled water as was predicted by Peter Poole and collaborators using ST2 water model[3].References[1] J. T. Titantah and M. Karttunen Long-Time Correlations and Hydrophobe-Modified Hydrogen-Bonding Dynamics in Hydrophobic Hydration. J. Am. Chem. Soc. 134 9362 (2012)[2] J. T. Titantah and M. Karttunen Water dynamics: Relation between hydrogen bond bifurcations molecular jumps local density & hydrophobicity. Sci. Rep. 3 2991 (2013)[3] Poole P. H. Sciortino F. Essmann U. & Stanley H. E. Phase behaviour of metastable water. Nature 360 324328 (1992)
Calculating the free energy of antimicrobial peptide (HHC-36) dimerization in bulk

shaqa vafa University of Guelph

December 05, 2013 PIRSA:13120043

The increasing demand for antibiotics has contributed to the investigation of possible novel antibiotics by many researchers. For this purpose experimental and theoretical studies have been carried out to draw scientists' attention to antimicrobial peptides and their interaction with the surface of bacterial membranes. Their ability to disrupt the functioning of bacterial membranes has been probed from different perspectives. The most desirable antimicrobial peptides are those which do not harm plant or animals' membranes but which disrupt bacterial membranes. It has been found that some cationic antimicrobial peptides (CAPs) satisfy these requirements. CAPs interacting with the outer membrane of gram-negative bacteria and the membrane of gram-positive bacteria have been studied recently.We conduct a Molecular Dynamics simulation study of peptide-peptide interactions in physiological solutions and investigate the mechanism of CAPs aggregation since aggregation of the peptides could precede their interaction with the membrane. Different algorithms are applied to calculate the potential mean force of the aggregation process of peptides to select the most efficient one. Also we have run CD spectroscopy and calorimetry experiments to predict the structure of the peptide and measure the peptide-peptide binding enthalpy and compared these results with our simulation data. The particular CAP studied is HHC-36 a peptide selected by high throughput screening (A. Cherkasov et al ACS Chem. Biol. 2009 4 (1) pp 6574) (M. Kazemzadeh-Narbat et al Biomed. Mater. Res. Part B 2012 5 pp1344-1352) (M. Ma et al Biomed. Mater. Res. Part A 2012 2 pp278-185) which has nine amino acid residues and charge +5.
Strominger-Yau-Zaslow revisited

David Morrison University of California - Santa Barbara (UCSB)

November 21, 2004 PIRSA:04110024
Cohomology groups in mirror symmetry
November 21, 2004 PIRSA:04110025
13/14 PSI - Standard Model Review - Lecture 1

Paul Langacker Institute for Advanced Study (IAS)

January 06, 2014 PIRSA:14010008
13/14 PSI - Gravitational Physics Review - Lecture 1

Ruth Gregory King's College London - Department of Mathematics

January 06, 2014 PIRSA:14010027
13/14 PSI - Standard Model Review - Lecture 2

Paul Langacker Institute for Advanced Study (IAS)

January 07, 2014 PIRSA:14010009

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