26. 9. 2012. Семинар: Предраг С. Крстић


У среду 26. 9. 2012. године у 14 часова у сали библиотеке Института за физику у Београду


Predrag S. Krstic,
TheoretiK Consulting, Knoxville , TN, USA
Joint Institute of Computational Sciences, University of Tennessee  & Oak Ridge National Laboratory, Oak Ridge, TN, USA
Department for Physics and Astronomy, University of Tennessee, Knoxville, TN, USA

The main challenges of the so called physical approaches to DNA sequencing, based on the reading of electrical signals associated to the DNA bases while a single DNA polymer is translocated through the synthetic nanopore [1], are twofold: (1) electric signal-to-noise ratio that distinguishes between the DNA bases and (2) full control and localization of a DNA in the nanoelectrode  gap or nanopore. We study both issues for  various  types of the  nanopore  technologies (carbon nanotubes, silicon nanopores and  linear quadrupole , aqueous  nanotraps), by multiscale  theoretical approaches, ranging  from  quantum mechanical , quantum-classical and classical molecular dynamics, to continuum fluid dynamics. Our results are validated by experiments at Arizona State University [2,3] (Stuart Lindsay) and  Yale University [4,5] (Mark Reed). This talk will discuss problems and possible solutions for DNA translocation and tunneling recognition with electrode functionalization in presence of thermal fluctuations, viscosity, electrophoretic, dielectrophotretic and electroosmotic  forces.

[1] Branton D et al,  NATURE BIOTECHNOLOGY  26, 1146-1153  (2008).
[2]   Liu HT et al, , SCIENCE, 327(5961), 68  (2010).
[3] P. Pang et al, , ACS NANO  5 (9), 7277–7283 (2011).
[4] W. Guan et al, ,  PNAS  108 (23),  9326-9330 (2011).
[5] Park, J. H. et al,  SMALL 8, 907 (2012).