. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. HOURS Figure 3. Changes in the levels of glycogen in gemmules of Eiiniipni\ lrui; during germination. Values are expressed as means ± 1 SE (n = 3). weight of gemmule tissue (jumol/gfw)—balance one an- other very closely: sorbitol decreases by 32 ^mol/gfw (from an average control value of 36 jumol/gfw to an av- erage steady-state level of 4 janol/gfw), and glycogen in- creases by 33 ^mol/gfw (from an average control value of 29 jigfw to an average steady-state value of 62 /umol/ gfw). The synthesis of glycogen from a car
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. HOURS Figure 3. Changes in the levels of glycogen in gemmules of Eiiniipni\ lrui; during germination. Values are expressed as means ± 1 SE (n = 3). weight of gemmule tissue (jumol/gfw)—balance one an- other very closely: sorbitol decreases by 32 ^mol/gfw (from an average control value of 36 jumol/gfw to an av- erage steady-state level of 4 janol/gfw), and glycogen in- creases by 33 ^mol/gfw (from an average control value of 29 jigfw to an average steady-state value of 62 /umol/ gfw). The synthesis of glycogen from a carbohydrate pre- cursor is consistent with observations for other develop- ing invertebrates; for example, during the first few hours of germination, the osmotic pressure of gemmules of Spongillu laciistris drops precipitously (Rasmont. 1975). Rasmont (1975) attributed this reduction in osmotic pressure to the resynthesis of glycogen from an unidenti- fied low molecular weight precursor. Also, in insect lar- vae, the synthesis of glycerol and sorbitol during exposure to cold occurs at the expense of glycogen, and -r. SORBITOL DEHYDROGENASE ALDOSE REDUCTASE D 0 10 20 30 40 50 HOURS AT ROOM TEMPERATURE 60 Z UJ I- O D: Q. O 5 UJ Figure 4. Changes in the activity of sorbitol dehydrogenasc and aldose reductase in gemmules of Eu- napius I'ragilis during germination. Assay conditions are as outlined in the Materials and Methods section. Values are expressed as means ± I SE (/; = 3).. 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. ); Marine Biological Laboratory (Woods Hole, Mass. ). Annual report 1907/08-1952; Lillie, Frank Rattray, 1870-1947; Moore, Carl Richard, 1892-; Redfield, Alfred Clarence, 1890-1983. Woods Hole, Mass. : Marine Biol
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