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- W2074401105 abstract "The time-resolved spectra of photoproducts from ligand photodissociation of oxyhemoglobin are measured in the Soret spectral region for times from 10 ns to 320 microseconds after laser photolysis. Four processes are detected at a heme concentration of 80 microM: a 38-ns geminate recombination, a 137-ns tertiary relaxation, and two bimolecular processes for rebinding of molecular oxygen. The pseudo-first-order rate constants for rebinding to the alpha and beta subunits of hemoglobin are 3.2 x 10(4) s-1 (31 microseconds lifetime) and 9.4 x 10(4) s-1 (11 microseconds lifetime), respectively. The significance of kinetic measurements made at different heme concentrations is discussed in terms of the equilibrium compositions of hemoglobin tetramer and dimer mixtures. The rebinding rate constants for alpha and beta chains are observed to be about two times slower in the dimer than in the tetramer, a finding that appears to support the observation of quaternary enhancement in equilibrium ligand binding by hemoglobin tetramers." @default.
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- W2074401105 date "1996-09-01" @default.
- W2074401105 modified "2023-09-26" @default.
- W2074401105 title "Nanosecond time-resolved absorption studies of human oxyhemoglobin photolysis intermediates" @default.
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- W2074401105 doi "https://doi.org/10.1016/s0006-3495(96)79362-1" @default.
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