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• W2535436914 abstract "We present a dynamically adjustable nanofluidic platform for formatting the conformations of and visualizing the interaction kinetics between biomolecules in solution, offering new time resolution and control of the reaction processes. This platform extends convex lens-induced confinement (CLiC), a technique for imaging molecules under confinement, by introducing a system for in situ modification of the chemical environment; this system uses a deep microchannel to diffusively exchange reagents within the nanoscale imaging region, whose height is fixed by a nanopost array. To illustrate, we visualize and manipulate salt-induced, surfactant-induced, and enzyme-induced reactions between small-molecule reagents and DNA molecules, where the conformations of the DNA molecules are formatted by the imposed nanoscale confinement. In response to dynamically modifying the local salt concentration, we report two salt-induced transitions in DNA molecules which occur on separate time scales: a rapid change in polymer extension due to modified local ionic screening and a gradual change in polymer brightness, reflecting release of intercalated YOYO-1 dye. Our time-resolved measurements provide new insights into the influence of YOYO-1 dye on polymer stiffness. In response to introducing cationic surfactants in solution, we temporally resolve single-molecule compaction trajectories of DNA polymers, guided by the confining nanogroove environment; this is in contrast to the uncontrolled collapse which would occur in free solution under similar conditions. In the presence of restriction enzymes, we directly visualize the cleavage of multiple DNA sites under adjustable nanoscale confinement. By using nanofabricated, nonabsorbing, low-background glass walls to confine biomolecules, our nanofluidic platform facilitates quantitative exploration of physiologically and biotechnologically relevant processes at the nanoscale. This device provides new kinetic information about dynamic chemical processes at the single-molecule level, using advancements in the CLiC design including a microchannel-based diffuser and postarray-based dialysis slit." @default.
• W2535436914 created "2016-10-28" @default.
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• W2535436914 date "2016-10-31" @default.
• W2535436914 modified "2023-10-14" @default.
• W2535436914 title "Manipulating and Visualizing Molecular Interactions in Customized Nanoscale Spaces" @default.
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• W2535436914 doi "https://doi.org/10.1021/acs.analchem.6b03149" @default.
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• W2535436914 hasPublicationYear "2016" @default.
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