Difference FT-IR studies of photoassembly in the manganese-containing catalytic site of photosystem II

Article Abstract:

Photosystem II is a membrane protein that oxidizes water to form molecular oxygen and catalyzes the use of water and energy from light by plants and cyanobacteria. A Fourier transform infrared spectroscopy was conducted to examine the oxidation of a partially assembled manganese cluster. The vibrational spectra and structure were also analyzed. The data indicate that the manganese cluster represents an intermediate in photoassembly and that the manganese oxidized from this intermediate possesses the same amino acid ligands as the manganese formed from the S2 multiline state.

Research, Manganese, Manganese (Metal), Membrane proteins, Oxidation-reduction reaction, Oxidation-reduction reactions, Photochemical research

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Activation energy of methyl radical decay in methane hydrate

Article Abstract:

The thermal stability of gamma-ray-induced methyl radicals in methane hydrate is studied using the electron spin resonance (ESR) method at atmospheric pressure and 210-260 K. The results show that methane hydrates dissociate into liquid (supercooled) water and gaseous methane in the temperature of 235-260 K.

Japan, Optical properties, Electron paramagnetic resonance spectroscopy, Natural gas, Gas hydrates, Enthalpy, Properties, Structure

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