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• W2083502170 abstract "We studied the mobility of DNA molecules driven by an electric field through a nanofluidic device containing a periodic array of deep and shallow regions termed entropic traps. The mobility of a group of DNA molecules was measured by fluorescent video microscopy. Since the depth of a shallow region is smaller than the DNA equilibrium size, DNA molecules are trapped for a characteristic time and must compress themselves to traverse the boundary between deep and shallow regions. Consistent with previous experimental results, we observed a nonlinear relationship between the mobility and electric field strength, and that longer DNA molecules have larger mobility. In repeated measurements under seemingly identical conditions, we measured fluctuations in the mobility significantly larger than expected from statistical variation. The variation was more pronounced for lower electric field strengths where the trapping time is considerable relative to the drift time. To determine the origin of these fluctuations, we investigated the dependence of the mobility on several variables: DNA concentration, ionic strength of the solvent, fluorescent dye staining ratio, electroosmotic flow, and electric field strength. The mobility fluctuations were moderately enhanced in conditions of reduced ionic strength and electroosmotic flow." @default.
• W2083502170 created "2016-06-24" @default.
• W2083502170 creator A5019170759 @default.
• W2083502170 creator A5021797257 @default.
• W2083502170 date "2014-07-01" @default.
• W2083502170 modified "2023-09-27" @default.
• W2083502170 title "Fluctuations of DNA mobility in nanofluidic entropic traps" @default.
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• W2083502170 doi "https://doi.org/10.1063/1.4887395" @default.
• W2083502170 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/4189160" @default.
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• W2083502170 hasPublicationYear "2014" @default.
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