Electron transfer between reactants located on opposite sides of liquid/liquid interfaces

Article Abstract:

Research was conducted to examine the effects of the nature and concentration of the supporting electrolytes on electrochemical responses for reactants dissolved in the thin layers of organic solvent. The objective was to obtain additional information about the rates of redox reactions between reactants residing in adjacent, immiscible phases via a novel method for interposing thin layers of organic solvents between graphite electrode surfaces and aqueous solutions. Results support the theory that electron transfer reactions across liquid/liquid interfaces are inherently more complex to analyze than are reactions at typical electrode/solution interfaces.

Research, Oxidation-reduction reaction, Oxidation-reduction reactions, Porphyrins, Organic solvents

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Tryptophan rotamer located in a polar environment probes pH-dependent conformational changes in bovine [beta]-lactoglobulin A

Article Abstract:

A study of the pH-dependent conformational changes in the well-characterized globular protein, bovine [beta]-lactoglobulin A (BLGA) which involves mostly the loop connecting strands E and F and deprotonation of a glutamic acid residue (Glu89), is carried out using fluorescence spectroscopy. It is concluded that the fluorescence of Trp 19 has the features of a more polar environment as compared to structural models, that a minimum of two unique rotamers of Trp19 contribute to the fluorescence of the protein and predicts the fluorescence lifetime of Trp61 in the unquenched form.

Analysis, Glutamate, Spectra, Optical properties, Fluorescence spectroscopy, Chemical properties, X-ray analysis, Globulin, Globulins

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Rotamer-specific potentials of mean force for residue pair interactions

Article Abstract:

It has been possible to design an approach for the development of knowledge-based mean-force potentials for representing residue-residue interactions in proteins at the amino acid level of resolution. For each residue, an additional discrete degree of freedom, the rotamer state of the residue, is introduced.

Proteins, Protein structure

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