THE BIOLOGICAL

1 The Newsletter of the Division of Biological of the American Physical Society Vol 3 No 4 October 2003

DIVISION OF BIOLOGICAL PHYSICS EXECUTIVE COMMITTEE Chair In this Issue Raymond Goldstein [email protected] CONFERENCE ANNOUNCEMENT Immediate Past Chair in and Medicine……………………..….....2 Robert Austin [email protected] DBP UPDATE: MONTREAL 2004 Chair-Elect Symposia and Focus Sessions…………..….……..………....5

Denis Rousseau [email protected] PRE HIGHLIGHTS……………………………….…….………..10 Vice-Chair Peter Jung [email protected] Secretary/Treasurer Paul Gailey Call for Abstracts! [email protected] APS Councilor Believe it or not, the next March Meeting is almost upon us! Robert Eisenberg [email protected] Registration information is online at the APS website at At-Large Members: http://www.aps.org/meet/MAR04/. The deadline for abstract submission is 5 pm EST on December 1, 2003. Ken Dill [email protected] Angel Garcia The DBP will have a large number of symposia and focus [email protected] sessions at the March Meeting; a number of these will be Leon Glass held jointly with other divisions. Dr. Denis Rousseau has [email protected] provided THE BIOLOGICAL PHYSICIST with a Ka Yee C. Lee [email protected] complete list of the accepted sessions. Check it out on page Herbert Levine 5, and look for focus sessions that may fit closely with the [email protected] abstract you plan to submit. Andrea Markelz [email protected] This issue of THE BIOLOGICAL PHYSICIST also brings you the announcement of an important upcoming conference on Fractals in Biology and Medicine (see page 2). Newsletter Editor And, of course, PRE Highlights. Sonya Bahar [email protected]

Website Coordinator Dan Gauthier SB [email protected] 1 Fourth International Symposium on Fractals in Biology and Medicine Ascona, Switzerland,

March 10-14, 2004

Symposium Venue related topics. Industrial researchers are invited to submit papers for regular platform or poster sessions. The Symposium will be held at the Centro Young participants would benefit from attending not Seminariale Monte Verità, CH-6612 Ascona, TI only by listening lectures presented by expert (near Locarno), Switzerland Ascona and the Monte scientists, but also by presenting their current Verità can be reached directly from Lugano-Agno research during platform or poster communications airport, by train or car through Locarno. so that the exchange of information and ideas Telephone: +41 91 791 01 81 between different groups of researchers working in Fax: +41 91 780 51 35 different areas of science and attracted by the E-mail: [email protected] paradigm, will be strengthened. They are strongly Detailed information on Website: encouraged to deliver a manuscript to be included in http://www.csf-mv.ethz.ch the Conference Proceedings which will be published http://www.fractals.issi.cerfim.ch in the new series "Mathematics and Biosciences in Interaction" by the Birkhäuser Press, Basel, Boston, Arrival: Tuesday 9, March 2004 Berlin. A financial support may be assigned to Departure: Sunday 14, March 2004 participants 35 years of age (at the time of conference). Scientific Goal Symposium Themes The main goals of the Fourth International Symposium will be: first, to highlight the potential Eight coherent sessions will be scheduled and that fractal geometry offers for elucidating and tentatively headed as: explaining the complex made-up of cells, tissues and biological either in normal, abnormal and 1. Fractals (spatial and temporal), power law, tumoral conditions. Second, to develop the concepts, nonlinear dynamics, complexity, self-organization, questions and methods required in research on fractal chaos, methodology. biology and natural phenomena and to evidence the pitfalls of a too simplistic application of these 2. Fractals, fractal structures in biological design, principles in investigating topical subjects of biology angiogenesis, development, fertilization, and medicine. It aims to bridge the communication morphogenesis, spatial-temporal tree structures, gap between various disciplines, to discuss present vessel branching and future applications of the fractal geometry, by bringing together cellular, molecular and natural 3. Fractals and chaos of functional complexity, biologists, engineers, mathematicians, , metabolic and signaling pathways, biodegradation physicians and other scientists in an ambient and natural environment favouring theinterdisciplinary vision. 4. Fractals in nuclei (DNA/ chromatin organization), The Symposium might be relevant for the industry gene expression, structures, membranes and involved in developing and applying software and organelles during growth, cell death (apoptosis, methods in the fields of morphometry, quantitative necrosis) and cancerogenesis image analysis, stereology, nonlinear dynamics and

2 5 Fractal in connective tissue, epithelial-stromal January 31, 2004 tissue interface, tissue-remodeling, biopolymers Deadline for submission of abstracts February 7, 2004 6. Fractals in brain and nervous tissues, Notification of acceptance on website neurosciences, muscle and cardiac tissues Attendance 7. Fractals of immunologic response and in autoimmune, aging and chronic diseases Limited to 80-100 participants

8. Fractals in biomedical engineering, pattern Scientific and Organizing Committee recognition, radiological, sonographic and ultrasonic image analysis, visual perception Prof. Dr. Gabriele A. Losa, chairman Institute for Scientific Interdisciplinary Studies, Sessions v. F.Rusca 1, CH-6600 Locarno, Switzerland Faculty of Sciences, University of Lausanne, The four-days symposium will be organized in CH-1000 Lausanne, Switzerland morning sessions that will be devoted to lectures phone and fax: +41 91 7516424 given by expert scientists on main topics and to e-mail: [email protected] shorter contributions. Afternoon sessions will be devoted to free platform communications and poster Prof. Dr. Theo F.Nonnenmacher, co-chairman sessions selected among submitted abstracts. Abteilung für Mathematische Physik, University Ulm, 89069-Ulm , Germany Poster sessions will be organized in the Balint Hall phone: +49 731 5022990; on Wednesday and Friday afternoons. Posters will be fax: +49 731 5023003 left displayed during the all symposium. e-mail: [email protected]

Among the Speakers… Prof. Dr. Danilo Merlini Centro di Ricerca in Fisica e Matematica, S. Albeverio (Germany), F. Albregtsen (Norway), M. v.F. Rusca 1, 6600 Locarno, Switzerland Buiatti (Italy), G. De Vico (Italy), N. Dioguardi phone and fax : +41 91 7516424 (Italy), A.Einstein (U.S.A.), Hirato Kitaoka (Japan), e-mail: [email protected] G. Landini (UK), G.A. Losa (Switzerland), B. Mandelbrot (U.S.A.), T. Mattfeld (Germany), E. Prof. Dr. Ewald R.Weibel. Oczeretko (Poland), T.F. Nonnenmacher (Germany), Department of Anatomy, University of Bern S.S. Papavasiliou (Greece), J.P. Rigaut (France), B. CH-3000 Bern, Switzerland Sapoval (France), P.Walizewski (Poland), E.R. e-mail: [email protected] Weibel (Switzerland), B. West (U.S.A.) Registration Fees Abstract submission SFr. 130.- Abstracts of one or two pages (format A4) including The registration fee covers the access to the figures and references should be submitted to the symposium, social events and a copy of the abstract Scientific Committee by e-mail attached document booklet. (Format: PDF, Word (doc), rtf, text) until January 31, 2004. Selected abstracts will be published in a regular Hotel registration and Travel information issue of Biology Forum, an international multidisciplinary Journal. Hotel Centro Seminariale Monte Verità single room + breakfast: sfr. 115.- / night Abstract submission deadlines double room + breakfast: sfr. 80.- / night

October 31, 2003 Telephone: +41 91 791 01 81; Deadline to submit information on your participation Fax: +41 91 780 51 35 to the Fourth Symposium with indication of the topic e-mail: [email protected] of your paper. (But contact the conference organizers Website: http://www.csf.ethz.ch in case of possible deadline extension.) More information about Hotels: http://www.ticino-tourism.ch

3 How to get there Swiss National Science Foundation, Swiss Academy of Sciences, Swiss Society of Cytometry, Swiss Locarno Rail Station-Ascona terminal: bus no. 31. Society of Cell Biology, Swiss Society of From Ascona to Centro Seminariale Monte Verità: Microscopy, Dipartimento Istruzione, Cultura e Sport minibus service (BUXI) by Ascona Taxi, phone:+41 (Ufficio Studi Universitari) of the Republic of Canton 917917777 Ticino, Accademia di Architettura of the University Location: Underground Parking, via Baraggie, of Italian Switzerland (USI), Swiss Center for walking distance from Bus Terminal. Scientific Computing, Manno, Società Ticinese di Scienze Naturali, Lugano, Institute for Scientific Social events Interdisciplinary Study, Locarno, Research Center for Mathematics and Physics (CERFIM), Locarno Thursday 11 March: afternoon Cultural visit Sponsorship

Thursday 11 March: 6:00 pm Public Institutions Celebration of Benoît Mandelbrot's 80th Birthday Dipartimento Istruzione e Cultura Ufficio Studi Friday 12 March: 8:30 pm Universitari e Repubblica e Stato del Canton Ticino, Fractal Dinner with musical entertainment at the Bellinzona; Swiss National Science Foundation, Restaurant Monte Verità Berne; Swiss Academy of Sciences, Berne; Major and City of Locarno Patronage Private Institutions The Symposium will be held under the patronage of: International Society of Stereology, International Cryms, Manno, information technology Society for Diagnostic Quantitative Pathology, European Society for Analytical Cellular Pathology,

4 MARCH MEETING: MONTREAL 2004 DBP SYMPOSIA AND FOCUS SESSIONS

This list of sessions was provided to THE Jorge V. Jose – Motors and physical model of BIOLOGICAL PHYSICIST by Dr. Denis the mitotic spindle Rousseau, DBP Program Chair for the 2004 March Meeting. 3. The Theory of Hydrogen Transfer Reactions in Biological Systems INVITED SESSIONS (SYMPOSIA) Symposium Organizer: Steven D. Schwartz Speakers/Titles: 1. Cutting Edge Techniques in Biological James T. Hynes – Infrared induced proton Physics (Joint with DCMP) transfer reactions in solution Symposium Organizer: Denis L. Rousseau Sharon Hammes-Schiffer- Hybrid quantum- Speakers/Titles: classical molecular dynamics of hydrogen Syun-Ru Yeh – A cool business: trapping Transfer Reactions in Enzymes intermediates on the submillisecond time scale Jiali Gao – Balancing kinetic and Robert A. Austin – Sailing against the wind: thermodynamic control: The mechanism of sorting without diffusion carbocation cyclization by squalene cyclase Chad A. Mirkin – Going for the gold: Using Charles L. Brooks III – Factors influencing nanostructures for PCR-less detection of hydride transfer in DHFR: Are dynamics coupled to catalysis? David G. Grier – Transforming mesoscopic Steven D. Schwartz – Symmetrically coupled (bio)materials with dynamic holographic vibrations and hydrogen transfer dynamics in optical tweezers coupled electron proton transfer system Stephen M. Durbin – NRVS: Synchrotron measurement of heme vibrational 4. From Biological to Artificial Membranes frequencies and applications to modeling Symposium Organizer: Sonia E. Létant functional dynamics Speakers/Titles: Stephen H. White – How membranes shape 2. Molecular Motors and Physics of Cell protein structure Division Daniel Branton – Solid state Symposium Organizers: nenopores:altering ion selectivity by surface Jayanth R. Banavar and David Sharp modifications Speakers/Titles: Charles R. Martin – DNA and protein Jonathan M. Scholey – Mitosis: History and transport in synthetic nanotube membranes overview Tejal A. Desai – Nanoporous inorganic David J. Sharp – Reeling-in chromosomes on membranes for bioseparation and drug spindle fibers: Roles of - delivery destabilizing enzymes in mitotic spindle dynamics 5. Mechanics of Self-Assembled Structures Andrew Wilde – Regulatory mechanisms (Joint with DCMP) controlling mitotic spindle assembly Symposium Organizer: Phil Nelson Speakers/Titles:

5 Joe Rudnick – Principles of virus self- Laure Kiessling – Synthetic multivalent assembly ligands and probes of inter-receptor Thomas R. Powers- Theory of polymorphism communication in bacterial chemotaxis of bacterial flagella Hans Othmer – An integrated model for Christoph Schmidt – Mechanics of signal transduction in motor control in E. Coli and viral capsids Andreas Bausch – Structure of self-assembled 9. Interacting Biological Agents in two-dimensional spherical crystals Experiment and Theory Rob Phillips – Finite element modeling of Symposium Organizer: Anke Ordemann ciral shells and capsid packing Speakers/Titles: Herbert Levine – Self-organization during 6. Physics of Ion Interaction with Proteins: dictyostelium amoeba aggregation Ion Mobility and Ion Selectivity in Channels Ai Nihongi – Small aquatic animals sensing Symposium Organizer: Maria Kurnikova their environment: feeding, mating, and Speakers/Titles: predator avoidance Jayendran Rasaiah – Ion diffusion through John Toner – Fish gotta swim, birds gotta fly, carbon nanopres and hydrophobic channels I gotta do Feynman graphs ‘til I die: a Rob Coalson – Modeling ion currents through continuum theory of flocking protein channels Chad Topaz – Dynamics of a two- Helmut Grubmuller – Long-time scale dimensional continuous model for swarming modeling of protein channels. Lutz Schimansky-Grier – The theory of Benoit Roux – Simulation of ions in Ga and swarming active Brownian KcsA channels 10. Teaching Biological Physics 7. Physics and Biology of Protein-DNA Symposium Organizer: Phil Nelson Interaction Speakers/Titles: Symposium Organizer: Ned S. Wingreen Ray Goldstein – A laboratory course in Speakers/Titles: Biological Physics Richard Lavery - The alchemy of protein- Robijn Bruinsma – A first-year physics DNA Binding course with a biophysical emphasis. Gary Stormo – Is there a code for protein- Joe Howard – Bio2010, The National DNA Recognition? Academy of Sciences report on -sciences Anirvan Sengupta – Specificity and education: The role of physics robustness in transcription control networks Steven Vogel – Teaching biological physics to Rahul Kulkarni – Protein-DNA coevolution non-physics majors via comparative biomechanics 8. New Developments in Understanding Phil Nelson – An upper-level course on Bacterial Chemotaxis biological physics Symposium Organizer: Herbert Levine Speakers/Titles: 11. Mechanics of Biological Cells and Philippe Cluzel – Single cell measurements in Cytoskeleton Protein Networks (Joint with bacterial chemotaxis. DCMP) Shahid Khan – Timing bacterial chemotaxis Symposium Organizer: H. Daniel Ou-Yang Tuhai Tu – Heterogeneous receptor cross-talk Speakers/Titles: and high gain in bacterial chemotaxis Alex J. Levine – Affine vs. nonaffine deformation in cytoskeletal networks

6 Margaret Gardel – Elasticity of composite Symposium Organizer: Ralph Colby actin networks Speakers/Titles: John C. Crocker – Micromechanics of the Gerald Manning - Electrostatics and DNA cytoskeleton controlled by cross-link self- mechanics. assembly Cyrus Safinya – Supramolecular assembly of H. Daniel Ou-Yang – Biomechanics and biological . intracellular dynamics of vascular entothelial Andrea Chow – Electrophoresis of ion cells containing polymers in microfluidic Linda Hirst – Filamentous actin skin-layer applications membranes with novel morphologies Michel Armand – Polymer electrolytes: dichotomy between -like disorder and 12. Physical Modeling of DNA Microarrays point defects in crystals Symposium Organizer: Yuhai Tu Carols Marques – Self-assembly of single- Speakers/Titles: charged diblock copolymers Glenn Held – Modeling of DNA microarray data using physical properties of hybridization 15. Development of Detectors/Sensors for John Santa Lucia Jr. – Progress toward 3D Imaging Applications (Joint with FIAP) structure prediction of DNA and RNA. Symposium Organizer: Stephen Laderman – Molecular models Srezana Bogdanovich underlying and sensitive and specific Speakers/Titles: determination of copy number changes in the Erik Tkaczyk – X-ray amorphous silicon human genome and transcriptome detectors for medical and industrial imaging Felix Naef – Simple physical midels for Xi-Cheng Zhang – Recent development of accurate oligonucleotide arrays terahertz wave tomographic imaging R. Stephen Bekiranov – Use of Langmuir Ravi Saraf – Large area nanodevice for adsorption isotherms to predict response in tressure and texture imaging oligonucleotide microarrays Otto Gregory – IR sensors for imaging and monitoring applications 13. Structure and Dynamics of Complex Robert Street - Direct conversion detectors Networks (Joint with DCMP) for medical imaging Symposium Organizer: Eivind Almaas Speakers/Titles: 16. Laser Ablation of Biological and Steven Strogatz – Synchronization on Polymeric Materials (Joint with FIAP) complex networks Symposium Organizer: Albert Laszlo Barabasi – Power laws and Frederick Pinkerton hierarchy in biological networks Speakers/Titles: Mark Neuman - Mixing patterns and Rangaswamy Sriniva – Twenty years of community structure in networks ablative photodecomposition Stuart A. Kauffman – Boolean logic Thomas Lippert – Chemical and networks as a paradigm for developmental spectroscopic aspects of polymer ablation: dynamics Special features and novel directions Michael C. Mackey – Mathematical models Barbara Garrison – Photochemical ablation in gene regulation of organic solids Douglas Chrisey – Cell-by-cell fabrication of 14. Ion Containing Polymers (Joint with biological systems by laser forward transfer DPOLY)

7 FOCUS SESSIONS Peter Tass - Tomographic synchronization and phase resetting analysis of the human A. Physics in Physiology I brain with magnetoencephalography Symposium Organizer: Plamen Ch. Ivanov Speakers/Titles: F. The Use of Neutron and X-ray Leon Glass – Paroxysmal starting and Reflectivity Studies of Thin Films of stopping of reentrant waves in tissue culture Biophysical Interest Peter Jung – Dressed neurons: modeling and Symposium Organizer: Sunil K. Sinha tripartite synapse Speakers/Titles: Jaroslaw Majewski – Studies of B. Physics in Physiology II biomembranes at solid-liquid interfaces Symposium Organizer: Martin Huber Ka Yee C. Lee – Aggregation of beta-amyloid Speakers/Titles: under model lipid membranes Bela Suki – Statistical physics approaches to respiratory dynamics and lung structure G. and Computation J.J. Collins – Noise-enhanced sensorimotor Symposium Organizer: Terence Hwa function Speakers/Titles: Ron Weiss – Engineering cells with C. Structure and Dynamics of Four-way computation and signal processing DNA Junctions (Holliday junctions) Terence Hwa – Combinatorial control of gene Symposium Organizer: Otto F. Sankey expression from simple molecular interactions Speakers/ Titles: Taekjip Ha – Single fluorescence H. Physics of Ion Interaction with Proteins study of Holliday junction branch migration: Symposium Organizer: Maria Kurnikova One step at a time Speakers/Titles: Yuri Lyubchenko – Structure and dynamics Dirk Gillespie – DFT approaches to ion of four-way junctions revealed by single- channel selectivity molecule AFM Timothy A. Cross – NMR experiment to assess ion channel flexibility and ion binding D. Materials Physics Problems in Structural (Joint with DMP) I. Cochlear Physics Symposium Organizer: Robert E. Thorne Symposium Organizer: Speakers/Titles: J. Leo van Hemmen Aleksey Lomakin – Liquid-solid transition in Speakers/Titles: nuclei of protein crystals A. J. Hudspeth – Experiments of a Alexander J. Malkin – Scanning probe mechanical amplifier in the ear microscopy in the visualization of biological Frank Julicher – Active amplification by ultrastructures: from macromolecular crystals critical oscillators in hearing to human pathogens J. Stretching of Proteins E. Synchronization and Phase Resetting in Symposium Organizer: the Nervous System Jayanth R. Banavar Symposium Organizer: Peter A. Tass Speakers/Titles: Dave Thirumalai – Probing Speakers/ Titles: the landscape of proteins using Alexander Neiman – Phase resetting in the mechanical unfolding experiments electroreceptor afferents of paddlefish

8 Marek Ceiplak – Mechanical stretching and O. Biochemical Networks I (Joint with contact order of proteins GSNP) Symposium Organizer: Ray Goldstein K. Acoustic Methods for Studying Bio- Speakers/Titles: organic Thin Films Chao Tang – Global dynamical properties of Symposium Organizer: Ilya Reviakine the yeast cell cycle network Speakers/Titles: Ping Ao – Quantitative analysis of the stability Diethelm Johannsmann – Determination of of lysogenic state in Phage Lambda viscoelastic parameters based on QCM measurements on many overtones P. Neutron Scattering and Biomimetic Curtis W. Frank – Measurements to study Materials (Joint with CAP) supported lipid bilayer formation resulting Symposium Organizer: John Katsaras from vesicle fusion Speakers/Titles: John H. Root – Neutron scattering: A L. powerful and versatile methodology for Ab Initio Approaches to Electronic research on bio, soft and nanophase materials Structure and Dynamics of Proteins John Katsaras – Small-single neutron Symposium Organizer: Jorge H. Rodriguez scattering and spontaneous formation of Speakers/Titles: unilamellar vesicles: potential vehicles for Jorge H. Rodriguez – Ab initio electronic drug delivery structure of antiferromagnetic metal centers in proteins Q. Organismal Biomechanics Todd J. Martinez – Ab initio excited state Symposium Organizer: Ray Goldstein dynamics of the photoactive yellow protein Speakers/Titles: chromophore Jane Wang – Falling paper, flapping flight, and making a virtual insect. M. Modeling and Simulation of Biomolecules R. Cellular Biomechanics Symposium Organizer: Jorge H. Rodriguez Symposium Organizer: Ray Goldstein Speakers/Titles: Speakers/Titles: Harold Sheraga – Physics-based ab initio Nyles Charon – Spirochete motility and global optimization of potential energy to morphology compute protein structure Juliet Lee – Keratocyte motility William A.Goddard – Ab initio prediction of the structure of G-protein coupled receptors S. Electrostatics in Complex and Biological Fluids (Joint with GSNP, DPOLY) N. Symposium Organizer: Pattern Formation: From Single Particles to Monica Olvera de la Cruz Waves and Swarms Speakers/Titles: Symposium Organizer: Frank Moss Ronald Netz – Electrostatically driven Speakers/Titles: complexation. Kenneth Showalter – Stability and control of Francis Rondelez – Interactions of long DNA unstable propagating waves chains with charged surfaces: Entropy, Anke Ordemann – Vortex-swarming in conformations and applications zooplankton: experiments and theory

9 PRE HIGHLIGHTS

AUGUST 2003 Published 11 August 2003 (9 pages) Biological Physics Articles from 021903 Physical Review E (Statistical, Nonlinear, and Soft Matter Physics) Statistical mechanical approaches to models Volume 68, Number 2, Articles (02xxxx) with many poorly known parameters http://ojps.aip.org/dbt/dbt.jsp?KEY=PLEEE8&Volume=68&Issue=2 Kevin S. Brown and James P. Sethna Published 12 August 2003 (9 pages) 021904 RAPID COMMUNICATIONS Dielectric boundary and its crucial role Balancing at the border of instability in gramicidin Luc Moreau and Eduardo Sontag Boaz Nadler, Uwe Hollerbach, and R. S. Published 22 August 2003 (4 pages) Eisenberg 020901(R) Published 13 August 2003 (9 pages) 021905 Antispirals in an artificial tissue of oscillatory cells Rectification efficiency of a Brownian motor Henrik Skødt and Preben Graae Daisuke Suzuki and Toyonori Munakata SørensenPublished 29 August 2003 (4 pages) Published 15 August 2003 (6 pages) 020902(R) 021906

ARTICLES in the absence of external characterized by interference total Perturbation model to predict the effect of internal reflection microscopy spatially varying absorptive inhomogeneities Giovanni Cappello, Mathilde Badoual, Albrecht in diffusing media Ott, Jacques Prost, and Lorenzo Busoni S. De Nicola, R. Esposito, and M. Lepore Published 15 August 2003 (7 pages) Published 1 August 2003 (10 pages) 021907 021901 Metachronal waves for deterministic Theoretical predictions for spatial covariance switching two-state oscillators with of the electroencephalographic signal during hydrodynamic interaction the anesthetic-induced phase transition: M. Cosentino Lagomarsino, P. Jona, and B. Increased correlation length and emergence Bassetti of spatialself-organization Published 18 August 2003 (9 pages) Moira L. Steyn-Ross, D. A. Steyn-Ross, J. W. 021908 Sleigh, and D. R. Whiting Published 7 August 2003 (18 pages) Two-vibron bound states in -helix proteins: 021902 The interplay between the intramolecular anharmonicity and the strong vibron–phonon Models of spatial and orientational self- coupling organization of microtubules under the V. Pouthier influence of gravitational fields Published 18 August 2003 (15 pages) S. Portet, J. A. Tuszynski, J. M. Dixon, and M. V. 021909 Sataric

10 Totally asymmetric exclusion process with Characterization of flow reduction properties extended objects: A model for protein in an aneurysm due to a stent synthesis Miki Hirabayashi, Makoto Ohta, Daniel A. Leah B. Shaw, R. K. P. Zia, and Kelvin H. Lee Rüfenacht, and Bastien Chopard Published 18 August 2003 (17 pages) Published 26 August 2003 (6 pages) 021910 021918

Modeling DNA structure, elasticity, and Slow switching in a population of delayed deformations at the base-pair level pulse-coupled oscillators Boris Mergell, Mohammad R. Ejtehadi, and Ralf Hiroshi Kori Everaers Published 28 August 2003 (8 pages) Published 20 August 2003 (15 pages) 021919 021911 Firing of a neuron model driven by Fokker-Planck perspective on long-range correlated noise delay systems: Exact solutions and data J. W. Middleton, M. J. Chacron, B. Lindner, and analysis of biological systems A. Longtin T. D. Frank, P. J. Beek, and R. Friedrich Published 28 August 2003 (8 pages) Published 22 August 2003 (10 pages) 021920 021912 Structure, dynamics, and energetics of water Multifractal and correlation analyses of at the surface of a small globular protein: A protein sequences from complete genomes molecular dynamics simulation Zu-Guo Yu, Vo Anh, and Ka-Sing Lau Shubhra Ghosh Dastidar and Chaitali Published 22 August 2003 (10 pages) Mukhopadhyay 021913 Published 28 August 2003 (9 pages) 021921 Spatiotemporal dynamics of optical molecular motors Nonuniform corticothalamic continuum Edeltraud Gehrig and Ortwin Hess model of electroencephalographic spectra Published 22 August 2003 (10 pages) with application to split-alpha peaks 021914 P. A. Robinson, R. W. Whitehouse, and C. J. Rennie Sparks and waves in a stochastic fire-diffuse- Published 28 August 2003 (10 pages) fire model of Ca2+ release 021922 S. Coombes and Y. Timofeeva Published 25 August 2003 (8 pages) Stability of negative-image equilibria in spike- 021915 timing-dependent plasticity Alan Williams, Patrick D. Roberts, and Todd K. Coherent states of Gompertzian growth Leen Marcin Molski and Jerzy Konarski Published 29 August 2003 (14 pages) Published 25 August 2003 (7 pages) 021923 021916 Compressing inverse lyotropic systems: Spiral wave stability in cardiac tissue with Structural behavior and energetics of dioleoyl biphasic restitution phosphatidyl ethanolamine O. Bernus, H. Verschelde, and A. V. Panfilov Michela Pisani, Theyencheri Narayanan, Published 26 August 2003 (6 pages) Giordano M. Di Gregorio, Claudio Ferrero, 021917 Stephanie Finet, and Paolo Mariani Published 29 August 2003 (11 pages) 021924

11 031901 Interplay of chemotaxis and chemokinesis Competition between interchain and mechanisms in bacterial dynamics intrachain phase segregation Maria R. D'Orsogna, Marc A. Suchard, and T. Iwaki and K. Yoshikawa Tom Chou Published 8 September 2003 (7 pages) Published 29 August 2003 (10 pages) 031902 021925 Dynamics of DNA in vitro evolution with COMMENTS Mnt-repressor: Simulations and analysis Yufeng Yang, Hongli Wang, and Qi Ouyang Comment on "Molecular gyroscopes and Published 9 September 2003 (8 pages) biological effects of weak extremely low- 031903 frequency magnetic fields" (Phys. Rev. E 65, 051912 (2002)) Increase in error threshold for quasispecies J. C. Gill by heterogeneous replication accuracy Published 20 August 2003 (3 pages) Kazuhiro Aoki and Mitsuru Furusawa 023901 Published 10 September 2003 (6 pages) 031904 Reply to "Comment on `Molecular gyroscopes and biological effects of weak Nuclear quantum effects on electron transfer extremely low-frequency magnetic fields'" reactions in DNA hairpins V. N. Binhi Shigenori Tanaka and Yasuo Sengoku Published 20 August 2003 (3 pages) Published 11 September 2003 (5 pages) 023902 031905

SEPTEMBER 2003 Replica-free evaluation of the neuronal Biological Physics Articles from population information with mixed Physical Review E continuous and discrete stimuli: From the (Statistical, Nonlinear, and Soft Matter Physics) linear to the asymptotic regime Volume 68, Number 3, Articles (02xxxx) Valeria Del Prete http://ojps.aip.org/dbt/dbt.jsp?KEY=PLEEE8&Volume=68&Issue=3 Published 11 September 2003 (17 pages) 031906

RAPID COMMUNICATIONS Postinhibitory rebound delay and weak synchronization in Hodgkin-Huxley neuronal Prisoners' dilemma in real-world networks acquaintance networks: Spikes and David T. W. Chik and Z. D. Wang quasiequilibria induced by the interplay Published 12 September 2003 (7 pages) between structure and dynamics Petter Holme, Ala Trusina, Beom Jun Kim, and Anisotropic effects in highly scattering media Petter Minnhagen Jenni Heino, Simon Arridge, Jan Sikora, and Published 22 September 2003 (4 pages) Erkki Somersalo 030901(R) Published 18 September 2003 (8 pages) 031908 ARTICLES Recursiveness, switching, and fluctuations in Direct observation of the effective bending a replicating catalytic network moduli of a fluid membrane: Free-energy cost Kunihiko Kaneko due to the reference-plane deformations Published 18 September 2003 (5 pages) Yoshihiro Nishiyama 031909 Published 3 September 2003 (9 pages)

12 Synapse efficiency diverges due to synaptic pruning following overgrowth Punctuated equilibria and 1/f noise in a Kazushi Mimura, Tomoyuki Kimoto, and Masato biological coevolution model with individual- Okada based dynamics Published 22 September 2003 (15 pages) Per Arne Rikvold and R. K. P. Zia 031910 Published 26 September 2003 (16 pages) 031913 Superparamagnetic segmentation by excitable neural systems Wave nucleation rate in excitable systems in Juan P. Neirotti, Samuel M. Kurcbart, and the low noise limit Nestor Caticha Hervé Henry and Herbert Levine Published 23 September 2003 (9 pages) Published 30 September 2003 (5 pages) 031911 031914

Traveling waves with dispersive variability and time delay S. Harris Published 24 September 2003 (5 pages) 031912

13