Abstract
1. 1. To evaluate changes in high-energy phosphate metabolism in the water scorpion ( Ranatra chinensis) under restraint and cold water-warm water stresses, in vivo [ 31P]NMR spectra were obtained. 2. 2. Under restraint stress, arginine phosphate (Arg-P) decreased by 10% after 1 hr and remained at that level thereafter, while β-ATP showed negligible changes over 6 hr. 3. 3. As the water temperature gradually increased or decreased, the relative concentration of Arg-P decreased due to enzyme regulation. 4. 4. Repeated cold water-warm water stress, which consisted of repeated 15 min exposures to cold water (5°C) followed by 15 min exposures to warm water (30°C) caused distinct decreases in Arg-P and β-ATP concentration. These decreases were dependent on the frequency of exposure. 5. 5. Phosphomonoesters (PME) increased not only with restraint stress but also with cold water-warm water stress. 6. 6. The effect of cold water-warm water stress on high-energy phosphate metabolism was greater than that of restraint stress.
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