Stimulated photon-echo and transient-grating studies of protein-matrix solvation dynamics and interexciton-state radiationless decay in alpha phycocyanin and allophycocyanin
Article Abstract:
The three-pulse stimulated-photon-echo peak-shift (3PEPS) measurement and the transient-grating (TG) spectroscopy were applied to examine the internal solvation reaction and excited-state dynamics of two photosynthetic light-harvesting systems derived from the phycobilisome of cyanobacteria. The 3PEPS technique allowed the differentiation of the solvation reaction from the typical rapid phase of the Stokes shift. The TG reaction showed components from vibrational relaxation in the lower exciton state and unclear energy transfer between the chromophores in an exciton-coupled pair.
Publication Name: Journal of Physical Chemistry B
Subject: Chemicals, plastics and rubber industries
ISSN: 1520-6106
Year: 1998
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Solvatochromism in a near-critical solution: a direct correlation with local solution structure
Article Abstract:
The utilization of supercritical fluids (SCF) as extraction media inspired various scientific investigations on its solvating properties. Experiments were performed on a SCF model solution to investigate solvatochromic shifts. In addition, the density dependence of the solvatochromic shifts, the structural features of the model solution and the nature of solute-solvent cluster in a SCF near its critical point were examined. Few additional nearest-neighbor atoms in excess of the number expected from the average density of the bulk solvent were observed in SCF clusters.
Publication Name: Journal of Physical Chemistry B
Subject: Chemicals, plastics and rubber industries
ISSN: 1520-6106
Year: 1998
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Tautomerism of 1-methyl derivatives of uracil, thymine, and 5-bromouracil. Is tautomerism the basis for the mutagenicity of 5-bromouridine?
Article Abstract:
Research was conducted to examine the tautomerism of the N-1-methylated derivatives of thymine, uracil and 5-bromouracil to investigate its implications in the mutagenicity of 5-bromouridine. State-of-the-art ab initio quantum mechanical calculations were utilized to determine the tautomeric preference in the gas phase. Results indicate that the enol tautomers of uracil, thymine and 5-bromouracil are intrinsincally unstable in the gas phase.
Publication Name: Journal of Physical Chemistry B
Subject: Chemicals, plastics and rubber industries
ISSN: 1520-6106
Year: 1998
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