ABSTRACT
The in vivo toxic effects of hexavalent chromium (20 mg/liter) on hemolymph glucose, tissue glycogen, total free sugars, and active and total phosphorylases of an edible, freshwater crab Barytelphusa guerini were studied. In a 15-day exposure span followed by a 15-day postexposure recovery, the time-course alterations in these constituent segments of the glycogen metabolism indicate an inconsistent depletion in metabolite levels and elevated enzyme activities during exposure period as well as hyperglycemia. An insignificant recovery was observed in these parameters on the 15th day of the postexposure phase.
Subject(s)
Brachyura/metabolism , Chromium/toxicity , Glycogen/metabolism , Hemolymph/metabolism , Animals , Carbohydrate Metabolism , Chromium/poisoning , Environmental Exposure , Glucose/metabolism , Phosphorylases/metabolismABSTRACT
Exposure of fresh water crab Barytelphusa querini to a sublethal concentration of NaF (30 ppm) caused significant alterations in the carbohydrate metabolism. In an exposure span of 15 days the crab was observed to have marked depletion in glycogen and total free sugar levels. A significant elevation in "active" and "total" glycogen phosphorylase activity was observed. The activity changes of lactate dehydrogenase reflected changes in tissue lactate levels and succinate dehydrogenase activity had a tissue specificity.
