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Biol Bull 113: 382-387. (December 1957)
© 1957 Marine Biological Laboratory
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RESPIRATION OF HOMOGENIZED EMBRYOS: RANA PIPIENS AND RANA PIPIENS female x RANA SYLVATICA male

JOHN R. GREGG 1 and FRANCES L. RAY 1

1 Zoology Department, Columbia University, New York 27, New York

1. The respiration of phosphate-buffered cell-free homogenates made from R. pipiens embryos increases exponentially with the age of the embryos up until the time at which they are in the tailbud stage, after which the rate declines.

2. Addition of 0.2% sodium deoxycholate elevates the respiration of homogenized embryos at any pre-tailbud stage to that of tailbud-breis, but has no effect upon that of breis of post-tailbud embryos.

3. The respiration of plain- or deoxycholate-treated breis is at all stages greater than or equal to that of intact embryos.

4. The respiration of breis (plain- and deoxycholate-treated) made from gastrula-arrested R. pipiens female x R. sylvatica male hybrid embryos is at all non-moribund stages quantitatively the same as that of control breis of normal embryos.

5. The implications of these findings are briefly discussed.






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Copyright © 1957 by the Marine Biological Laboratory.