Abstract
Activity of NADP+-dependent isocitrate dehydrogenase (ICDH) of the white dorsal muscle of Idus idus L. was determined by special analysis, under optimum homogenisation, centrifugation and cuvette conditions. The experimental conditions differed considerably from those used for the investigation of NADP+-ICDH activity in mammals by Bücher et al. (1964). Daily measurements of activity over a period of 10 days revealed variations in enzyme activity which are difficult to explain. However, the variations are smaller than those established in earlier tests. In order to obtain statistically valid results, the highest possible number of test fishes (at least 10 individuals for each measurement) must be investigated over a period of 5 to 10 days. NADP+-ICDH of individuals acclimated to 10°C showed 28% higher specific and non-specific activity than that of fish maintained at 20°C (experimental temperature 25°C). At 5 different adaptation temperatures, increasing activities were observed with decreasing adaptation temperature (compensation). These measurements were made over a period of 5 successive days.
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Communicated by O. Kinne, Hamburg
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Passia, D. NADP+-isocitrat-dehydrogenase aus Idus idus (Pisces: Cyprinidae). I. Aktivität als funktion der adaptationstemperatur. Mar. Biol. 23, 197–204 (1973). https://doi.org/10.1007/BF00389485
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DOI: https://doi.org/10.1007/BF00389485