Carbon Dioxide Fixation in Marine Invertebrates: A Survey of Major Phyla

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Science  20 Nov 1959:
Vol. 130, Issue 3386, pp. 1409-1410
DOI: 10.1126/science.130.3386.1409


Fourteen species of marine invertebrates representing 12 phyla were kept in sea water containing NaHC14O2 for 1 hour. All of them fixed CO2 into acids of the Krebs citric acid cycle. In most species the major portion of the radioactivity recovered after chromatography was in succinic, fumaric, and malic acids. The findings favor the hypothesis that both CO2 fixation and the citric acid cycle are virtually universal among marine invertebrates.