Modeling Microbial Diversity
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Professor Ned Wingreen Department of Molecular Biology, Princeton
Applied Physics Seminar The Bacterial Flagellar Motor: Step, Jump, and Spin Professor Ned Wingreen Department of Molecular Biology, Princeton Abstract: The flagellar motor is a highly efficient rotary machine used by bacteria like E. coli for propulsion. Recently, it was discovered that at low motor speeds rotation proceeds in steps. I will present a simple physical model for this stepping behavior as a random walk in a corrugated potential arising from a combination of torque and contact forces. One implication of this model is that the angular position of the rotor is crucial for the stepping properties. This hypothesis is consistent with the available data, in particular the observation that backward steps are smaller on average than forward steps. The model also makes novel predictions, including a sublinear torque-speed relationship at low torque, and a peak in rotor diffusion with increasing torque. Finally, I will discuss open questions including the molecular mechanism of torque generation. Biography: Ned Wingreen received his Ph. D. in theoretical condensed matter physics from Cornell University in 1989. He did his postdoc in mesoscopic physics at MIT before moving, in 1991, to the newly founded NEC Research Institute in Princeton. At NEC, he continued to work in mesoscopic physics, but also started research on the statistical mechanics of protein folding. Thinking about proteins led him inexorably down the path into biology. During a sabbatical at UC Berkeley in 1999, his primary focus shifted to systems biology of bacteria. Wingreen joined Princeton University as a Professor of Molecular Biology in 2004. Tuesday January 20st 4:00pm-5:00pm. -
Ned Wingreen CV
Ned S. Wingreen Howard A. Prior Professor of the Life Sciences Department of Molecular Biology & Lewis-Sigler Institute for Integrative Genomics PRINCETON UNIVERSITY Princeton, NJ 08544-1014 PHONE: 609-258-8476 EMAIL: [email protected] EDUCATION California Institute of Technology Physics B.S. 1984 Cornell University Physics M.S. 1988 Cornell University Physics Ph.D. 1989 PROFESSIONAL EMPLOYMENT 9/84 – 5/89 Fannie and John Hertz Foundation Fellow, Lab of Atomic and Solid State Physics, Cornell University 5/89 – 9/89 Visiting Scientist, Weizmann Institute of Science, Israel 9/89 – 9/91 Postdoctoral Associate, Physics Department, MIT 9/91 – 3/99 Research Scientist, Physical Sciences Division, NEC Research Institute 4/99 – 10/02 Senior Research Scientist, Physical Sciences Division, NEC Research Institute 8/99 – 5/00 Sabbatical Visitor, University of California, Berkeley 11/02 – 1/04 Senior Research Staff Member, NEC Laboratories America, Inc. 2/04 – Present Professor, Department of Molecular Biology, Princeton University 10/06 – Present Associated Faculty, Department of Physics, Princeton University 8/07 – 8/17 General Member, Aspen Center for Physics 5/08 – Present Member, Lewis-Sigler Institute, Princeton University 7/11 – 6/18 Associate Director, Lewis-Sigler Institute, Princeton University 1/13 – 7/15 Acting Director, Lewis-Sigler Institute, Princeton University 7/16 – Present Faculty Fellow, Princeton Center for Theoretical Science 2/17 – 6/19 Member, KITP Advisory Board 7/19 – Present Associate Director, Princeton Center for Theoretical Science 8/20 – Present Director of Graduate Studies, QCB Graduate Program HONORS Academic: California Institute of Technology (1980-1984) Presidential Scholar (1980) Carnation Merit Scholarship (1982-1983) Caltech Merit Scholarship (1983-1984) Jack E. -
KERWYN CASEY HUANG, Ph. D
KERWYN CASEY HUANG, Ph. D. DEPARTMENT OF BIOENGINEERING, STANFORD UNIVERSITY SHRIRAM BUILDING 007 MC:4245 • STANFORD CA 94305 Phone 650-721-2483 • E-mail [email protected] http://whatislife.stanford.edu EDUCATION Massachusetts Institute of Technology (GPA: 4.9/5.0) 1999–2004 Ph.D. in Physics. Thesis: Polaritonic Photonic Crystals, Melting, and Min-Protein Oscillations. University of Cambridge 1998–1999 M.Phil. in Physics. Thesis: Ab initio Determination of Energetics and Forces in Molecules. California Institute of Technology (GPA: 4.0/4.0) 1994–1998 B.S. with Honors in Physics and Mathematics. EMPLOYMENT AND RESEARCH EXPERIENCE Stanford University, Biophysics Program, Stanford, CA 2015 – present Director. Stanford University, Department of Microbiology and Immunology, Stanford, CA 2014 – present Associate Professor of Microbiology and Immunology. Stanford University, Department of Bioengineering, Stanford, CA 2014 – present Associate Professor of Bioengineering, with courtesy appointments in Biochemistry. Stanford University, Department of Microbiology and Immunology, Stanford, CA 2011 – 2014 Assistant Professor of Microbiology and Immunology. Stanford University, Department of Bioengineering, Stanford, CA 2008 – 2014 Assistant Professor of Bioengineering, with courtesy appointments in Biochemistry and Electrical Engineering. Princeton University, Department of Molecular Biology, Princeton, NJ 2004 – 2008 Visiting Research Fellow and Associate Research Scholar, Laboratory of Professor Ned Wingreen. • Research into the biophysics of cell-shape detection, including polymer formation, lipid localization, and cell-wall synthesis. • Awarded a National Institutes of Health K25 Mentored Quantitative Research Career Development Award, $625,000 direct costs 2005-2010, to develop a molecular model of Min-protein polymer formation in E. coli. Massachusetts Institute of Technology, Department of Physics, Cambridge, MA 1999 – 2004 Graduate student, Laboratory of Professor John Joannopoulos. -
Ned S. Wingreen Howard A. Prior Professor of the Life Sciences Department of Molecular Biology & Lewis-Sigler Institute
Ned S. Wingreen Howard A. Prior Professor of the Life Sciences Department of Molecular Biology & Lewis-Sigler Institute for Integrative Genomics PRINCETON UNIVERSITY Princeton, NJ 08544-1014 PHONE: 609-258-8476 FAX: 609-258-7599 EMAIL: [email protected] EDUCATION California Institute of Technology Physics B.S. 1984 Cornell University Physics M.S. 1988 Cornell University Physics Ph.D. 1989 Dissertation: Resonant Tunneling with Electron-Phonon Interaction. Thesis adviser: Professor John W. Wilkins. PROFESSIONAL EMPLOYMENT 9/84 – 5/89 Fannie and John Hertz Foundation Fellow, Lab of Atomic and Solid State Physics, Cornell University 5/89 – 9/89 Visiting Scientist, Weizmann Institute of Science, Israel 9/89 – 9/91 Postdoctoral Associate, Physics Department, MIT, Supervisor: Patrick A. Lee 9/91 – 3/99 Research Scientist, Physical Sciences Division, NEC Research Institute 4/99 – 10/02 Senior Research Scientist, Physical Sciences Division, NEC Research Institute 8/99 – 5/00 Sabbatical Visitor, University of California, Berkeley 11/02 – 1/04 Senior Research Staff Member, NEC Laboratories America, Inc. 2/04 – Present Professor, Department of Molecular Biology, Princeton University 10/06 – Present Associated Faculty, Department of Physics, Princeton University 5/08 – Present Member, Lewis-Sigler Institute, Princeton University 7/11 – Present Associate Director, Lewis-Sigler Institute, Princeton University 1/13 – Present Acting Director, Lewis-Sigler Institute, Princeton University HONORS Academic: California Institute of Technology (1980-1984) Presidential Scholar (1980) Carnation Merit Scholarship (1982-1983) Caltech Merit Scholarship (1983-1984) Jack E. Froehlich Memorial Award (1983) McKinney Prize in Literature (1984) Cornell University (1984-1989) Fannie and John Hertz Foundation Fellowship (1984-1989) Professional: Fellow of the American Physical Society Fellow of the American Association for the Advancement of Science (AAAS) PATENTS U.S. -
KERWYN CASEY HUANG, Ph. D
KERWYN CASEY HUANG, Ph. D. DEPARTMENT OF BIOENGINEERING, STANFORD UNIVERSITY SHRIRAM BUILDING 007 MC:4245 • STANFORD CA 94305 Phone 650-721-2483 • E-mail [email protected] http://whatislife.stanford.edu EDUCATION Massachusetts Institute of Technology (GPA: 4.9/5.0) 1999–2004 Ph.D. in Physics. Thesis: Polaritonic Photonic Crystals, Melting, and Min-Protein Oscillations. University of Cambridge 1998–1999 M.Phil. in Physics. Thesis: Ab initio Determination of Energetics and Forces in Molecules. California Institute of Technology (GPA: 4.0/4.0) 1994–1998 B.S. with Honors in Physics and Mathematics. EMPLOYMENT AND RESEARCH EXPERIENCE Stanford University, Biophysics Program, Stanford, CA 2015 – present Director. Stanford University, Department of Microbiology and Immunology, Stanford, CA 2019 – present Professor of Microbiology and Immunology. Stanford University, Department of Bioengineering, Stanford, CA 2019 – present Professor of Bioengineering, with courtesy appointments in Biochemistry. Stanford University, Department of Microbiology and Immunology, Stanford, CA 2014 – present Associate Professor of Microbiology and Immunology. Stanford University, Department of Bioengineering, Stanford, CA 2014 – present Associate Professor of Bioengineering, with courtesy appointments in Biochemistry. Stanford University, Department of Microbiology and Immunology, Stanford, CA 2011 – 2014 Assistant Professor of Microbiology and Immunology. Stanford University, Department of Bioengineering, Stanford, CA 2008 – 2014 Assistant Professor of Bioengineering, -
Bacteria Meet Physics”
June 16, 2007 Workshop Proposal for Aspen Center for Physics Summer 2008 Program Title: “Bacteria Meet Physics” Organizers: Ned Wingreen* Michael Laub [email protected] [email protected] (609) 258-8476 (office) (617) 324-0418 (office) (609) 258-8616 (fax) (617) 253-8699 (fax) Department of Molecular Biology Department of Biology Princeton University Massachusetts Institute of Technology KC Huang [email protected] (609) 258-8699 (office) (609) 258-8616 (fax) Department of Molecular Biology Princeton University *Wingreen is the contact person and organizer responsible for ensuring diversity in the pool of applicants. Description and Justification: Rapid technical progress and recent discoveries in molecular biology have brought biologists face-to-face with the importance and challenge of understanding emergent physical phenomena in living cells. Nowhere is this more evident than in the study of bacteria, where fast generation times, tractable genetic systems, a wealth of biochemical probes, novel imaging approaches, and the availability of complete genomes for hundreds of species have allowed dramatic progress in characterizing cellular components and their basic interactions. However, biologists have found that this characterization is generally inadequate to formulate a full understanding of cellular processes. This “understanding gap” points to the presence in cells of biophysical phenomena, often subtle and complex, that emerge from the multiple interactions of cellular components. Over evolutionary time, cells have exploited and interwoven these biophysical effects to optimize the function of their systems. For physicists, helping biologists to understand how cells use physics is not only a challenge but also an opportunity: billions of years of “experiments” in biophysics are packed into every cell.