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[Oxidative phosphorylation in pulmonary mitochondria after massive blood loss and restitution by autologous transfusion].

A procedure is described for isolation and polarographic study of rabbit lung mitochondria exhibiting high respiratory control as well as coupling of oxidation and phosphorylation approaching the theoretical value. The procedure enabled to detect a reversible impairment of respiratory and phosphorylating functions of lung mitochondria under conditions of haemorrhagic shock, which was the most distinct within the first hours after blood reinfusion. Correlation was established between dynamics of alterations in mitochondrial energy production in lung tissue within posthaemorrhagic period and structure-functional characteristics of the lung surface system.

Animals↗
PubMed1956

The effect of temperature on oxidative phosphorylation with insect flight muscle mitochondria.

The effect of different temperatures on the biochemical activity and morphology of insect flight muscle mitochondria was examined. It was found that respiration and phosphorylation have the same thermal response at temperatures of 25 degrees C. and below. The energy of activation for both systems is approximately 12,300 calories. Oxidation and phosphorylation can be uncoupled effectively by temperature, for at temperatures above 25 degrees C. there is more rapid heat inactivation of phosphorylation. This is evident from reduced P/O values as well as from morphological deterioration in the mitochondrial population. The thermal response of both this sarcosomal enzyme system and the respiration in the living fly are quantitatively similar.

Cell Respiration↗