The turnover of radioactive phosphate injected into the subarachnoid space of the brain of the rat

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Abstract
P32 was injd. intracranially in rats. In 2 min. 40% of the newly introduced phosphate was in organic form. This increased to 70% in 8 hours. The organically bound radioactive phosphate was found chiefly in the form of adenosinetri-phosphate and creative phosphate. The labile phosphate groups were renewed at an approx. rate of 40[mu]g.P/min./g. of brain. This value is higher than values in the literature for liver and muscle.