Biomedical subjects
Publications and source records attributed to L G Dmitrovskiĭ.
ADP phosphorylation up to 2.5 nmol per mg of chlorphyll has been found in chloroplasts from Vicia faba plants when the suspension was sharply acidified from pH 8 to pH 1.6 with excess of HC1/KC1 solution. This fact appears to be due to confromation relaxation of the coupling factor under acid-induced denaturation. Heat pretreatment inhibits this effect.
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The quantum yield of noncyclic photophosphorylation in chloroplasts excited by a series of 8 mus flashes of the saturating intensity displays a two-fold decrease when the flash-frequency is reduced from about 1.1 to about 0.8 s-1, whereas further decrease of flash frequency does not affect the average ATP yield per flash. Under excitation by two-flashes series the ATP yield is also about half-maximal. These observations are inconsistent with the concept postulating accumulation of energy contributions from several parallel or consecutive one-electron transfers as a prerequisite for ATP formation. The two-state model of a thylakoid membrane and of a coupling site is put forward according to which only one of these states ensures ATP formation in response to one electron transfer through one coupling site, whereas the other state is nonphosphorylating.
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