バフンウニにおける海水からのカルシウムの吸収と排出〔バフンウニのカルシウム代謝に関する研究-3-〕

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The absorption of calcium from sea water and its excretion in the sea water, their routes and distribution into each part were studied by exposing to 45CaCl2-sea water and subsequently transfering to non-radioactive sea water in the sea urchin Hemicentrotus pulcherrimus. Radioactivities observed after 28 davs exposure were in order of tooth〉lantern〉test〉coelomic〉fluid (〉45CaCl2-sea water)〉gut〉gonad, with concentrated 45Ca level in coelomic fluid to that of sea water. Calcium excretion judged from the change in 45Ca concentration of coelomic fluid, was as rapid as absorption. From the experiments using animals with mouth, anus, gill, and test surface variously blocked with adhesive material, the tube feet were thought to be main routes for absorption and excretion of calcium.
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