Optically biased diffusion of single molecules studied by confocal fluorescence microscopy

Article Abstract:

The significance of the optical trapping effect and the resonance contribution to the biased diffusion of single Rhodamine 6G dye molecules was investigated using the single-molecule confocal laser microscopy. This type of microscopy was useful in the study of molecular diffusion over a large dynamic mass ranging from 479-68064 amu. It was discovered that the single small R6G dye molecules exhibited deviations from statistical behavior at early time intervals. These deviations were associated with biasing of diffusion resulting from a weak optical trapping effect.

Fluorescence microscopy, Chemistry, Diffusion, Diffusion (Physics), Solution (Chemistry), Solutions (Chemistry), Dyes and dyeing, Dye chemistry

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Entropy of water in the hydration layer of major and minor grooves of DNA

Article Abstract:

The entropy of water molecules is calculated in the major and minor grooves of a B-DNA duplex and in the bulk using a statistical mechanical scheme developed by Goddard and co-workers. The calculations for the water under equilibrium conditions appropriately shows that the undoubted entropy gain time T is canceled by the energetic effects in the process of transferal of water from the grooves of DNA to the bulk.

Science & research, Water, Entropy (Physics), Entropy (Thermodynamics)

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An investigation is conducted of the structure, stability and transformation of the P(sub n)3(sub m) bicontinuous cubic phase through synchrotron x-ray diffraction in the monoolein-water system. It appears the full hydration properties of monoolein are strongly related to the pressure.

Article Abstract:

Global analysis is performed on a large number of surface attached molecules, using single molecule fluorescence. Information is gained about the local environment of the fluorophore and the availability of the DNA to molecules in solution.

Fluorescence spectroscopy, Atomic properties

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