Abstract
IN isolated metathoraxes of the cockroach Periplaneta americana, 85 per cent of the mass of which is formed by the thoracic muscles, changes in various fractions of acid-soluble phosphorus compounds were followed during exposure of the preparations to anoxia. It was found that in such conditions there is a rapid breakdown of the labile phosphorus compounds, namely, arginine phosphate and adenosine triphosphate1. At the same time, however, the level of inorganic phosphate did not increase significantly; on the contrary, in many cases it showed a tendency to decrease. As the total acid-soluble phosphorus did not change at all, these facts indicated an accumulation of some stable phosphorus compound during anaerobiosis: this compound was found to be stable even to prolonged acid hydrolysis (three hours in normal acid).
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