Effect of temperature on the activities of ...

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Title Effect of temperature on the activities of glucose-6-phosphate dehydrogenase and hexokinase in entomopathogenic nematodes (Nematoda: Steinernematidae)
Author(s) G. B. Jagdale, R. Gordon
Journal Comparative Biochemistry and Physiology A, Physiology
Date 1997
Volume 118
Issue 4
Start page 1151
End page 1156
Abstract The kinetic properties of two metabolic enzymes, glucose-6-phosphate dehydrogenase and hexokinase, were studied in 4 strains of entomopathogenic nematodes that had been recycled for two years at various temperatures: Steinernema feltiae NF strain, S. feltiae Umea strain, S. carpocapsae. All strain, S. riobravis [S. riobravae] TX strain. The recycling temperatures influenced the activities of glucose-6-phosphate dehydrogenase and hexokinase in an adaptive fashion in all the strains. At each assay temperature (5-35 degrees C), the maximum specific activity of both the enzymes was greater in the nematodes that had been recycled at lower temperatures than in those reared at higher temperatures. In 3 enzyme-nematode strain combinations, the lowest Km values measured at each assay temperature occurred in nematodes that had been recycled at the lower temperatures. However, the assay temperatures at which the minimum Km values occurred were >= 15 degrees C. The capacities of these nematodes to adjust to different recycling temperatures is discussed in relation to the physiological mechanisms involved..

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