Symbiosis: On the Role of Algae Symbiotic with Hydra

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Science  15 Nov 1963:
Vol. 142, Issue 3594, pp. 956-958
DOI: 10.1126/science.142.3594.956


Green algae living within gastrodermal cells of hydra photosynthetically incorporate C11O2. About 10 percent of the carbon fixed by the algae is released to the hydra where it is assimilated into animal cell components The specific activity (counts per minute per microgram of protein nitrogen) of hydra animal tissue is 50 to 100 times greater than that of algae-free controls exposed to C14O2. Analyses were facilitated by a new method for rapid separation of hydra tissue layers.