Proceedings of the Japan Academy, Series B

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Mechanism of the transformation of forsterite to modified spinel structure has been studied using multi-anvil apparatus. In order to examine the effect of stress on the transformation mechanism, forsterite single crystals were placed in two different media of powdered forsterite and NaCl, where the latter medium was found to provide one order of magnitude smaller differential stress in the sample. Optical and transmission electron microscope observations for the run products at 15.5GPa, 1000°C clearly show evidence which supports the in coherent nucleation and growth mechanism for the olivine-modified spinel transformation in these experimental conditions. The present results, combined with those of earlier works, suggest that the other possible mechanism, a martensitic transformation, may be realized only under substantially large differential stress of over 2GPa for the olivine-modified spinel transformation in Mg₂SiO₄.

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We isolated four kinds of rat cDNAs for the catalytic subunits of protein phosphatase-1, PP-1α, PP-1γ1, PP-1γ2 and PP-1δ (Sasaki, K, et al. (1990) Jpn. J. Cancer Res., in press). Comparison between the predicted amino acid sequences of four cDNAs and the partial amino acid sequence of catalytic subunit from the glycogen bound form of PP-1 reported previously (Berndt, N. et al. (1987) FEBS Lett. 223, 340-346) showed that PP-1δ encodes catalytic subunit of glycogen bound form of PP-1 in the rabbit muscle.

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