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PubMed1984

Metabolic reorganization in the silk gland of eri-silkworm, Philosamia ricini, during thermal acclimation.

The silk gland of eri-silkworm, Philosamia ricini, at the end of the 5th instar, presents an interesting augmentation of RNA (23.5%) and protein (47.1%) concentrations in conjunction with a decrease in amino acid/DNA ratio (64.4%) due to the cold adaptation. However, on the first day of spinning process, the protein/DNA ratio of the tissue undergoes a decrease of 22.9% in its level, which has been attributed to the "masking" of the protein biosynthesis due to the commencement of spinning process.

Adaptation, Physiological↗
PubMed1979

Structural studies of natural actomyosin from thermally acclimated frogs.

Natural actomyosin was isolated from skeletal muscle of frogs (Rana catesbeiana) acclimated at 25 degrees C and 5 degrees C. It was found that preparations isolated from warm-acclimated frogs may display considerable degradation of myosin heavy chains as compared with preparations isolated from cold-acclimated frogs. However, degradation may be minimized by inclusion of protease inhibitors during purification, indicating enhanced protease activity in preparations of natural actomyosin from warm-acclimated frogs. When purified in the presence of protease inhibitors, natural actomyosin from both warm-acclimated and cold-acclimated frogs exhibits comparable subunit composition of SDS-gel electrophoresis. The overall gel pattern is similar to that obtained from rabbit natural actomyosin except that in the frog, troponin-T and troponin-C appear to co-migrate with tropomyosin and myosin light chain 2, respectively.

Acclimatization↗