Nonequilibrium oscillatory electron transfer in bacterial photosynthesis

Article Abstract:

Research was conducted to examine nonequilibrium oscillatory electron transfer in bacterial photosynthesis. A simple theory that describes the electronic surface crossing during vibrational relaxation induced by ultrafast photoexcitation was developed and applied to the primary electron transfer in the reaction centers of Rhodobacter spaeroides and Rhodopseudomonas viridis. Results suggest that detailed analysis of the transient behavior of the oscillating time-dependent reaction rate may provide useful information on the interplay between the surface crossing dynamics and the vibrational dephasing of ultrafast reactions.

Analysis, Photosynthesis research, Oxidation-reduction reaction, Oxidation-reduction reactions, Bacteria, Photosynthetic, Photosynthetic bacteria, Vibrational spectra

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Activation energy for isotope exchange reaction between 235UF5 nanoparticles and 238UF6 gas

Article Abstract:

A study of the temperature dependence characteristics of two kinetic processes that occur in the isotopic exchange reaction between natural uranium fluoride gas and uranium-235 enriched uranium fluoride nanoparticles has been conducted. The similar activation energies derived from the Arrhenius plot for both the slow and the fast processes indicate that the kinetic processes are primarily caused by the difference in the equation's preexponential factor.

Isotopes, Nanotechnology, Uranium, Uranium enrichment

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