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Biol Bull 68: 378-384. (June 1935)
© 1935 Marine Biological Laboratory
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AN ANALYSIS OF THE ACTION OF LITHIUM ON SEA URCHIN DEVELOPMENT

JOHN RUNNSTRÖM 1

1 From the Marine Biological Laboratory, Woods Hole, Mass.

The eggs of Echinarachnius parma are very sensitive to the action of lithium added to sea water.

A concentration of lithium was used which produces the typical "lithium development." The epithelial cells of normal and of lithium-treated blastulæ were stretched by microneedles and released. In normal larvæ the cells round up after release; in the lithium-treated larvæ they remain deformed. The hyaline plasma layer does not stiffen in the lithium-sea water and is not necessary for the flattening of the cells which takes place during the development. The presence of folds of the hyaline plasma layer at the vegetative pole in the late blastula and the early gastrula stage is described.

Pyocyanine, added to the lithium-sea water, counteracts the effect of the lithium and improves development. This and other facts indicate that lithium does not only exert an influence on the structure of the protoplasm but also on the respiration.






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Copyright © 1935 by the Marine Biological Laboratory.