. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 324 L. MUSCATINE AND H. M. LENHOFF by ultrasonic vibration. By gentle centrifugation most of the algae were separated from the bulk of the animal tissues, but mutual contamination could not be avoided. In two trials the resulting algal pellet contained and of the total radio- activity in the entire homogenate, tentatively indicating that the algae did not accumulate the isotope but depressed the rate of protein catabolism of the 0 DAYS FIGURE 5. Rate of loss of S^-labeled material by green ( •), grafted ( (I
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 324 L. MUSCATINE AND H. M. LENHOFF by ultrasonic vibration. By gentle centrifugation most of the algae were separated from the bulk of the animal tissues, but mutual contamination could not be avoided. In two trials the resulting algal pellet contained and of the total radio- activity in the entire homogenate, tentatively indicating that the algae did not accumulate the isotope but depressed the rate of protein catabolism of the 0 DAYS FIGURE 5. Rate of loss of S^-labeled material by green ( •), grafted ( (I), pale green (O)» and albino (O) C. riridissima containing, respectively, 100%, 30%, 20% and 0% photo- synthetically-active plant material. DISCUSSION The results of this study lead to the conclusion that symbiotic algae favorably influence the growth, reproduction, survival, and protein turn-over of C. viridissiina. The growth rate of green C. viridissiina on a limited food supply was consistently greater than that of aposymbiotic controls (Fig. 2; Table I). This difference was not the result of a proportionally larger food intake by green hydra (Fig. 3), but of some intrinsic factor associated with the presence of algae, since even during starvation green hydra produced more buds, survived longer, resisted disintegration and displayed a lower turnover of sulfur-labeled protein compared to aposymbiotic controls (Tables II, III). These results lend quantitative sup- port to the observations of Goetsch (1924), who noted that (1) well-fed albino hydra grew as well as well-fed green individuals, either in light or in darkness, and (2) when starved in the light, green hydra survived for nearly twice as long. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Marine Biological Laboratory (Woods Hole, Mass. ); Ma
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
