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Biol Bull 123: 450-460. (October 1962)
© 1962 Marine Biological Laboratory
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OXYGEN UPTAKE IN SHORT PIECES OF TUBULARIA STEMS

JAMES A. MILLER JR. 1, LORALEE L. PHILPOTT 2, and C. LLOYD CLAFF 3

1 Department of Anatomy, Tulane University, New Orleans 18, La.
2 Single Cell Research Foundation, Woods Hole, Mass.
3 The Marine Biological Laboratory, Woods Hole, Mass.

Oxygen uptake measurements were made in cartesian divers on 43 pieces of Tubularia stems between 1 mm. and 6 mm. in length with the following findings:

1. The 1-mm. stems had the highest, 3-mm. stems the next highest and 6-mm. stems had the lowest uptake when calculated per millimeter of length of stem.

2. By comparing uptake of 3-mm. and 6-mm. stems it was found that the middle 3 mm. of the 6-mm. stems used O2 at less than half the rate of the two ends. This is in disagreement with the conclusions of Barth and Sze that regeneration does not involve any appreciable increase in oxygen requirements.

3. When two or more pieces were placed in the same diver their oxygen uptakes were depressed. Calculations showed that neither hypoxia nor hypercapnia could have caused this depression. It was suggested from other studies that acid metabolites liberated through the cut surface may have caused the observed effects.






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