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Reaction rates for mesoscopic reaction-diffusion kinetics

Journal Article · · Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
 [1];  [2];  [3]
  1. Univ. of California, Santa Barbara, CA (United States); DOE Office of Scientific and Technical Information (OSTI)
  2. Uppsala Univ., Uppsala (Sweden)
  3. Univ. of California, Santa Barbara, CA (United States)
The mesoscopic reaction-diffusion master equation (RDME) is a popular modeling framework frequently applied to stochastic reaction-diffusion kinetics in systems biology. The RDME is derived from assumptions about the underlying physical properties of the system, and it may produce unphysical results for models where those assumptions fail. In that case, other more comprehensive models are better suited, such as hard-sphere Brownian dynamics (BD). Although the RDME is a model in its own right, and not inferred from any specific microscale model, it proves useful to attempt to approximate a microscale model by a specific choice of mesoscopic reaction rates. In this paper we derive mesoscopic scale-dependent reaction rates by matching certain statistics of the RDME solution to statistics of the solution of a widely used microscopic BD model: the Smoluchowski model with a Robin boundary condition at the reaction radius of two molecules. We also establish fundamental limits on the range of mesh resolutions for which this approach yields accurate results and show both theoretically and in numerical examples that as we approach the lower fundamental limit, the mesoscopic dynamics approach the microscopic dynamics. Finally, we show that for mesh sizes below the fundamental lower limit, results are less accurate. Thus, the lower limit determines the mesh size for which we obtain the most accurate results.
Research Organization:
Univ. of California, Santa Barbara, CA (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
SC0008975
OSTI ID:
1343614
Alternate ID(s):
OSTI ID: 1180098
Journal Information:
Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics, Journal Name: Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics Journal Issue: 2 Vol. 91; ISSN 1539-3755; ISSN PLEEE8
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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Cited By (8)

Fluctuating hydrodynamics of multi-species reactive mixtures journal June 2015
An adaptive tau-leaping method for stochastic simulations of reaction-diffusion systems journal March 2016
A framework for discrete stochastic simulation on 3D moving boundary domains journal November 2016
Stochastic simulation of reaction-diffusion systems: A fluctuating-hydrodynamics approach journal March 2017
Hybrid models for chemical reaction networks: Multiscale theory and application to gene regulatory systems journal September 2017
Mesoscopic-microscopic spatial stochastic simulation with automatic system partitioning journal December 2017
Stochastic self-tuning hybrid algorithm for reaction-diffusion systems journal December 2019
Reaction-diffusion kinetics on lattice at the microscopic scale journal September 2018

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