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The nickel centre of hydrogenase from Desulfovibrio gigas was studied by electron spin echo envelope modulation (ESEEM) spectroscopy in the oxidized, unready (Ni-A) and H 2 -reduced active (Ni-C) states, both in H 2 O and 2 H 2 O solution. Fourier transforms of the 3-pulse ESEEM, taken at 8.7 GHz, for Ni-A and Ni-C in H 2 O contained similar peaks with narrow...
When the cyanide complex of the copper protein, pig kidney diamine oxidase, is reduced anaerobically by cadaverine (1,5-diaminopentane), the broad, 480 nm absorption band characteristic of the resting enzyme is bleached and a new absorption spectrum with features at 457, 429, 403 (shoulder), 360 (shoulder) and 332 nm appears. Concomitantly, the EPR spectrum of the enzyme Cu(II)-CN complex decreases...
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