Summary
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1.
The activities of “key enzymes” representing the anaerobic pathway (GAPDH, LDH, ODH, PK, PEPCK, GPT, CS) in the adductor muscle of six species of mussels, the freshwater formsAnodonta cygnea, Dreissena polymorpha, andUnio spec. and the marine bivalvesCardium edule, Mya arenaria, andMytilus edulis, were assayed and compared with those in muscles from Crustacea and Amphibia (tail of the freshwater crayfishOrconectes limosus and gastrocnemius ofRana temporaria).
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2.
The glycolytic capacity (as indicated by the activity of GAPDH) of the adductor muscles is relatively low and the ability to produce lactate (as indicated by the activity of LDH) is very low. There are, however, high activities of enzymes essential for the production of succinate and octopine.
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3.
The glycogen stores of the adductor muscles from mussels were found to be significantly higher than in the muscles of Crustacea and Amphibia.
Zusammenfassung
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1.
Die Aktivitäten von „Schlüsselenzymen” des Anaerobiosestoffwechsels (GAPDH, LDH, ODH, PK, PEPCK, GPT, CS) wurden in den Schalenschließmuskeln von sechs verschiedenen Muschelarten, den SüßwasserformenAnodonta cygnea, Dreissena polymorpha undUnio spec. sowie den marinen BivalviernCardium edule, Mya arenaria undMytilus edulis, bestimmt und mit denen in glykolysierenden Muskeln der Crustaceen bzw. Amphibien verglichen (Schwanzmuskel vonOrconectes limosus bzw. Gastrocnemius vonRana temporaria).
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2.
Die Kapazität des Embden-Meyerhof-Weges (gemessen als Aktivität der GAPDH) der Muschelmuskeln ist verhältnismäßig gering, ihre Fähigkeit zur Lactatbildung (gemessen als Aktivität der LDH) minimal. Anstatt dessen konnten hohe Aktivitäten derjenigen Enzyme nachgewiesen werden, die für die Succinatgärung bzw. Octopingärung (?) essentiell sind.
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3.
Die Muschelmuskeln enthalten ein deutlich größeres Depot an Glykogen als die untersuchten Muskeln der Crustaceen und Amphibien.
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Gäde, G., Zebe, E. Über den Anaerobiosestoffwechsel von Molluskenmuskeln. J. Comp. Physiol. 85, 291–301 (1973). https://doi.org/10.1007/BF00694235
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DOI: https://doi.org/10.1007/BF00694235