ウミサボテンCavernularia obesa Valenciennesの日週期活動 : XIV. 体液中のアンモニア量の週期的変化(2)

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We have shown in the previous work (Takata and Mori, 1956) that the ammonium content in the body fluid of the sea-pen shows cyclic changes synchronously with rhythmic activities. This report deals with diurnal cycles of excretion of these ammonium. The results obtained are as follows: 1.The sea-pen begins to expand on the sand at about the sunset, and about 2 hours later body length attains maximum. After expanding over about half of the maximum body length, the rate of ammonium excretion reaches nearly constant level, i. e., about 30γ/hr. 2.The sea-pen stays expanded throughout the night and the rate of excretion of ammonium remains nearly constant; ammonium content in the body fluid also remains constant, which seems to be balanced with the former. However, comparing the amount of ammonium excreted in the environmental sea water with found in the body fluid, we cannot help supposing the possibility of protein synthesis from a part of ammonium produced. 3.The sea-pen contracts at dawn, meanwhile a large amount of ammonum is excreted. The total amount excreted during contraction is, though, far small (about one-tenth) when compared with the total amount contained in the body fluid just before the animal begins contraction. In this case, also, we have an opinion that a fair quantity of ammonium are synthesized into proteins. 4.During the daytime, the sea-pen stays contracted beneath the sand, and we cannot recognize any excretion of ammonium.
社団法人日本動物学会の論文
1957-07-15

ウミサボテンCavernularia obesa Valenciennesの日週期活動 : XIV. 体液中のアンモニア量の週期的変化(2)

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