. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 232 K. CARLSSON AND G. GADE A likely candidate was the succinate/propionate route well-known from euryoxic bivalves and an s (for reviews see Ga'de, 1983; Schottler, 1980), but not operating to a meanir extent in crustaceans. However, the succinate levels in muscle and hepatopanc. 3 tissue were only elevated by 1 and ^mol/g wet weight, respectively, and pr : . ;iiate was not present at all. Other data support the notion that the succinate/ propionate pathway is not working in L. polyphemus (, Fields, 1982; Zammit and
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 232 K. CARLSSON AND G. GADE A likely candidate was the succinate/propionate route well-known from euryoxic bivalves and an s (for reviews see Ga'de, 1983; Schottler, 1980), but not operating to a meanir extent in crustaceans. However, the succinate levels in muscle and hepatopanc. 3 tissue were only elevated by 1 and ^mol/g wet weight, respectively, and pr : . ;iiate was not present at all. Other data support the notion that the succinate/ propionate pathway is not working in L. polyphemus (, Fields, 1982; Zammit and Newsholme, 1978). Which other route of energy production, besides arginine phosphate transphos- phorylation and D-lactate formation, might occur then in L. polyphemus? Muscle and hepatopancreas accumulate L-alanine consistently. The bulk of this accumulation is observed after the main D-lactate formation has already occurred, and it quantitatively exceeds the D-lactate accumulation. Alanine production, via GOT and GPT, is known in bivalves and annelids, but is not possible in L. polyphemus due to the low levels of aspartate. We therefore propose a mechanism with the participation of GPT and glutamate dehydrogenase (see Fig. 9). Pyruvate derived by anaerobic breakdown of glycogen would be converted to alanine and «-ketoglutarate by the action of GPT. The keto acid, in turn, is oxidized with NH4+ by glutamate dehydrogenase to regenerate glutamate for the GPT reaction and to produce the oxidized coenzyme NAD+. The arginine-P glycogen NAD*. ADP ATP. 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
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