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Biol Bull 113: 365-375. (December 1957)
© 1957 Marine Biological Laboratory
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CHEMICAL ANALYSES OF ANTERIOR AND POSTERIOR BLASTOMERES OF CIONA INTESTINALIS

WILLIAM E. BERG 1

1 Department of Zoology, University of California, Berkeley 4, California

Anterior and posterior blastomeres of the four-cell stage of Ciona were separated for quantitative microchemical analyses of succinic dehydrogenase, apyrase, acid and alkaline phosphatases, and ribonucleic acid. Larger amounts of succinic dehydrogenase, apyrase and ribonucleic acid were found in homogenates of posterior cells whereas acid phosphatase activity was higher in anterior cells. The pH-activity curves of apyrases from anterior and posterior cells are similar, indicating a quantitative segregation of this enzyme. The unequal distribution of succinic dehydrogenase, apyrase and, possibly indirectly, acid phosphatase, is probably the result of a segregation of mitochondria.






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Copyright © 1957 by the Marine Biological Laboratory.