. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 418 E. L. TATUA1 AND G. W. BEADLE larval activity (food intake) and on the rate of metabolic processes. The medium containing per cent yeast was selected for standard starvation and used throughout further work. At 25° C. it consis- tently delayed larval development from 2 to 4 days and gave eye-color values of from to This is equivalent to a v+ hormone produc- tion of to units per individual (Tatum and Beadle, 1938). Con- trols were made for each series of experiments, with similar results. These contro
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 418 E. L. TATUA1 AND G. W. BEADLE larval activity (food intake) and on the rate of metabolic processes. The medium containing per cent yeast was selected for standard starvation and used throughout further work. At 25° C. it consis- tently delayed larval development from 2 to 4 days and gave eye-color values of from to This is equivalent to a v+ hormone produc- tion of to units per individual (Tatum and Beadle, 1938). Con- trols were made for each series of experiments, with similar results. These control starvation values are omitted from the tables in most cases. DRY YEAST, 7° -DRY YEAST, %, WITH HYDROLYZED CASEIN, O •J O Uj. PERC EN T SUCROSE FIG. 1. Influence of temperature and of hydrolyzed casein on sucrose inhibi- tion of the starvation effect (maximum color values for each sugar concentration used in plotting curves). Basic medium: per cent brewers' yeast in per cent agar. Effect of Carbohydrates Table II shows the influence of added carbohydrates on the starva- tion effect. Starch, sucrose, and glucose almost completely inhibited the production of pigment, although larval life was prolonged as much as or more than in the controls without carbohydrate. Several series of experiments were made to establish the relation of sugar concentration to prolongation of larval life and intensity of the starvation effect. Table III gives the combined results of these series. Concentrations of sucrose up to per cent shortened larval life as compared to the con- trol, without very marked effect on eye pigmentation. Higher sucrose concentrations progressively prolonged larval life and inhibited pig-. 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, Ma
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
