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[Protein and RNA synthesis in larvae of the yellow mealworm beetle (Tenebrio molitor) during cooling and cold acclimatization].

Functioning of protein-synthesis system freeze-avoiding larvae of Tenebrio molitor. (Tenebrinidae family) has been investigated at temperature lowering to 6-8 degrees. It has been shown that mealworms maintain the protein and RNA biosynthesis under cold acclimation (6-8 degrees C). Judging by the angle of inclination of Arrenius of plot reorganization of protein synthesis system takes place in the temperature range 0-10 degrees C. Biosynthesis of proteins at the room and low temperatures is inhibited by cycloheximide while biosynthesis of RNA--by alpha-amanitine.

Acclimatization↗
PubMed1977

[Urea concentration and arginase activity in the organs of rats during acclimatization to cold].

Arginase activity in the brain and liver and the urine contents in the brain, liver, and blood of rats on the 1st, 3rd, 30th, and 45th days of the cold acclimation (+2--+4 degrees C), were studied. The arginase activity was also studied in the brain, liver, and kidneys of adrenalectomized rats. During the acclimation, the arginase activity decreases by 1.5--2 times in the brain and increases 202.5-fold in the liver. The urine contents in the tissues raised dur to arginase activation in the liver. The brain activity of adrenalectomized animals does not differ from the control, while decreasing in the liver and kidneys by 33% and 60% respectively. We suppose that the difference between responses of the brain and liver arginases to cold is based on their different regulation by the adrenal hormones.

Acclimatization↗