This project involves collaborative research with NIH scientists, in which the research requires sophisticated mathematical tools or an acquaintance with theoretical methods in the physical sciences. Drs. George Weiss, Marian Bogunya, and Alexander Berezhkovskii (NIDDK) have worked on a variety of problems required to develop the theory of single-molecule spectroscopy. So far an exact solution has been found for the simplest possible two-state system which is an isomerization scheme with first-order transitions. Considerable effort has been spent in developing theoretical approaches to deal with more complicated chemical systems. This requires expansion of the theory of cumulative residence times in one or more states of a multistate system. To date we have published several papers on this subject. Drs. George Weiss, Marian Bogunya and Alexander Berezhkovskii (NIDDK) have developed a crude model which couples diffusive motion of molecules, and statistics of the amount of time during which a membrane pore has been occupied by n ions. Some progress has been made on this project, but many quite difficult questions remain.

Agency
National Institute of Health (NIH)
Institute
Center for Information Technology (CIT)
Type
Intramural Research (Z01)
Project #
1Z01CT000024-24
Application #
6431900
Study Section
(MSCL)
Project Start
Project End
Budget Start
Budget End
Support Year
24
Fiscal Year
2000
Total Cost
Indirect Cost
Name
Computer Research and Technology
Department
Type
DUNS #
City
State
Country
United States
Zip Code
Shvartsman, Stanislav Y; Coppey, Mathieu; Berezhkovskii, Alexander M (2008) Dynamics of maternal morphogen gradients in Drosophila. Curr Opin Genet Dev 18:342-7
Vazquez, Marco-Vinicio; Berezhkovskii, Alexander M; Dagdug, Leonardo (2008) Diffusion in linear porous media with periodic entropy barriers: A tube formed by contacting spheres. J Chem Phys 129:046101
Berezhkovskii, Alexander M; Bezrukov, Sergey M (2008) Fluctuation theorem for channel-facilitated membrane transport of interacting and noninteracting solutes. J Phys Chem B 112:6228-32
Berezhkovskii, Alexander M; Weiss, George H (2008) Propagators and related descriptors for non-Markovian asymmetric random walks with and without boundaries. J Chem Phys 128:044914
Berezhkovskii, Alexander M; Bezrukov, Sergey M (2008) Counting translocations of strongly repelling particles through single channels: fluctuation theorem for membrane transport. Phys Rev Lett 100:038104
Coppey, Mathieu; Boettiger, Alistair N; Berezhkovskii, Alexander M et al. (2008) Nuclear trapping shapes the terminal gradient in the Drosophila embryo. Curr Biol 18:915-9
Bezrukov, Sergey M; Berezhkovskii, Alexander M; Szabo, Attila (2007) Diffusion model of solute dynamics in a membrane channel: mapping onto the two-site model and optimizing the flux. J Chem Phys 127:115101
Dagdug, Leonardo; Berezhkovskii, Alexander M; Makhnovskii, Yurii A et al. (2007) Transient diffusion in a tube with dead ends. J Chem Phys 127:224712
Berezhkovskii, A M; Pustovoit, M A; Bezrukov, S M (2007) Diffusion in a tube of varying cross section: numerical study of reduction to effective one-dimensional description. J Chem Phys 126:134706
Berezhkovskii, A M; Barzykin, A V (2007) Simple formulas for the trapping rate by nonspherical absorber and capacitance of nonspherical conductor. J Chem Phys 126:106102

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