Direct observation of cations and polynucleotides explains polyion absorption to like-charged surfaces

Article Abstract:

An experimental approach is described for directly observing the condensation of polynucleotides and their electrolyte counterions at a liquid/solid interface. Observations and model demonstrates that polynucleotide absorption to a like charge surface via divalent ions in virtue of a cooperative effect does not require the bridging mechanism of the Sn(super 2+) to both the surface and the nucleotide, nor the charge inversion of the surface or of the polynucleotide.

Biological Product (except Diagnostic) Manufacturing, Drugs, Nucleic Acids, Cations

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Femtosecond fluorescence dynamics of porphyrin in solution and solid films: The effects of aggregation and interfacial electron transfer between porphyrin and TiO2

Article Abstract:

The exited-state relaxation dynamics of a synthetic porphyrin, ZnCAPEBPP in solution coated on a glass substrate as solid films mixed with PMMA and coated on a glass substrate as solid film and sensitized on nanocrystalline TiO2 films are investigated by using femtosecond fluorescence up-conversion spectroscopy with S2 excitation. Results have demonstrated the significance of aggregation affecting the observed relaxation dynamics in the solid phase.

Electron transport, Titanium compounds

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Comparative X-ray standing wave analysis of metal-phosphate multilayer films of dodecane and porphyrin molecular square

Article Abstract:

A study demonstrates that long-period X-ray standing wave (XSW) analysis is a very useful probe of the structure of layer-by-layer assembled metal phosphonate films. The method provides a simultaneous measurement from multiple atomic distribution profiles of various shapes and sizes over length scales of 1-20 nm.

Analysis, Phosphates, Chemical synthesis

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