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Biol Bull 48: 200-208. (March 1925)
© 1925 Marine Biological Laboratory
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DIRECT AND AFTER EFFECTS OF CHANGES IN MEDIUM DURING DIFFERENT PERIODS IN THE LIFE HISTORY OF UROLEPTUS MOBILIS

I. EFFECTS OF BEEF EXTRACT

LOUISE H. GREGORY

The response of Uroleptus mobilis to treatment with a beef-flour medium varies with the age of the protoplasm. Both young and old series are immediately depressed in the beef medium but recover their vitality and may show a greater division rate than that of the control series when transferred to the normal hay-flour medium. Mature series on the other hand are stimulated when placed in the beef medium. The stimulation however is not continued when the series is returned to the normal environment. Beef seems to be an immediate stimulant if the protoplasm is mature, and a delayed stimulant if the series is young or old, the effect being seen only after transference to normal hay-flour medium.






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Copyright © 1925 by the Marine Biological Laboratory.