BIOCHEMICAL STUDIES ON PTERIA (PINCTADA) MARTENSII (DUNKER) AND HYRIOPSIS SCHLEGELII (V. MARTENS)-XIV:ON THE PHOSPHORUS METABOLISM OF PTERIA (PINCTADA) MARTENSII (DUNKER) EMPLOYING 32P

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The author investigated the metabolism of phosphorus in each tissue of Pteria (Pinctada) martensii (DUNKER), using 32P as a tracer. The results are as follows. 1) As is shown in Figures 1 and 2, the accumulation of 32P to each tissue reached the equilibrium after 30 hrs or more, and the disappearance of 32P required about 11 to 15 hrs as biological half time. 2) The turn over rate of phosphorus was about 0.017γ/hour/lg. wet tissue in the mantle, 0.015γ/hour/lg. in the gills, 0.011γ/hour/lg. in the viscera and 0.003γ/hour/lg. in the adductor muscle, respectively (see Tables 1 and 2). The quantities of phosphorus metabolixed are as small as about 1/14, 000 to 1/57, 000 when compared with those of calcium metabolized of pearl oyster, which was measured under another conditions10). 3) It was presumed that the pearl oyster takes the greater part of phosphorus through the digestive system via mouth and the small part of phosphorus through the tissue surface directly. 4) As one of the reason that the shell contains trace of phosphorus the secretory function of mantle which secrets, phosphorus only in very smaller quantity than calcium and carbon dioxide was supposed.
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