学术报告：Variational multiscale models for nano-bio systems
报告题目：Variational multiscale models for nano-bio systems报告人：Guowei wei（Michigan State University）
报告时间：2011.6.20（星期一）上午10：00
报告地点：嘉定园区学术活动中心302
A major feature of biological science in the 21st Century will be its transition from a phenomenological and descriptive discipline to a quantitative and predictive one. Revolutionary opportunities have emerged for mathematically driven advances in biological research. Similarly, nanofluidics, nano-electronic devices, and nano-technology offer new promises for alternative energies and economic growth. However, the emergence of complexity in self-organizing biological systems and nano-technology poses fabulous challenges to their quantitative description because of the excessively high dimensionality. A crucial question is how to reduce the number of degrees of freedom, while returning the fundamental physics in complex nano-bio systems. This talk focuses on a new variational multiscale paradigm for nano-bio systems. Under the physiological condition, most biological processes, such as protein folding, ion channel transport and signal transduction, occur in water, which consists of 65-90 percent of human cell mass. Therefore, it is desirable to describe membrane protein by discrete atomic and/or quantum mechanical variables; while treating the aqueous environment as a dielectric or hydrodynamic continuum. I will discuss the use of differential geometry theory of surfaces for coupling microscopic and macroscopic scales on an equal footing. Based on the variational principle, we derive the coupled Poisson-Boltzmann, Nernst-Planck (or Kohn-Sham), Laplace-Beltrami and Navier-Stokes equations for the structure, dynamics and transport of nano-bio systems. As a consistency check, our models reproduce appropriate solvation models at equilibrium. Moreover, our model predictions are intensively validated by experimental measurements.
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