Bulletin of the Chemical Society of Japan

Kawase, Yoshiyuki

doi: 10.1246/bcsj.31.390pmid: N/A

Tanaka, Kentaro

doi: 10.1246/bcsj.31.393pmid: N/A

RNase-resistant material obtained from yeast RNA was fractionated on an ECTEOLA-cellulose column. The elution was performed with sodium chloride-neutral phosphate buffer as solvent, the concentration of sodium chloride being increased by either gradient or stepwise procedure. Separation of oligonucleotides seemed to be affected by their molecular size. The products of larger molecular weight present in pancreatic-RNase digests of yeast RNA were very rich in guanylic acid.

Miyano, Masateru; Matsui, Masanao

doi: 10.1246/bcsj.31.397pmid: N/A

Yasumi, Masasi; Okabayashi, Hideo; Komooka, Hitoshi

doi: 10.1246/bcsj.31.402pmid: N/A

Our previous theory of dielectric constant of liquid consisting of spherical molecules having an isotropic polarizability is extended to the case when the molecule has an ellipsoidal shape and an anisotropic polarizability.The theory is compared with experimental results for about thirty substances. The coincidence is quite satisfactory with few exceptions. For non-polar substance, better agreement between the experimental value and the theoretical value is achieved if we use our formula instead of the Lorentz-Lorenz formula.

Sata, Toshiyuki

doi: 10.1246/bcsj.31.408pmid: N/A

The phase relationship in the system 3CaO·P2O5–MgO·SiO2–SiO2 was investigated by the usual quenching method. In the partial system 3CaO·-P2O5–SiO2, the existence of solid solution and the change of the transition temperature of α–β tricalcium phosphate were not found by X-ray examinations.The partial system 3CaO·P2O5–MgO·SiO2 is pseudo-binary, whose eutectic is at 1246°C and 40% 3CaO·P2O5. In this system, β-3CaO·P2O5, always appeared in quenched samples, has a maximum solid solubility of 7±2% MgO·SiO2.The system 3CaO·P2O5–MgO-SiO2–SiO2 has two quintuple points, the one an alteration point and the other a ternary eutectic at 50.5% 3CaO·P2O5, 15.0% MgO, 34.5% SiO2 that melts at 1230±4°C.This system is of great importance to the manufacture of the fused phosphatic fertilizer and the bone ash magnesia porcelain. For instance, in this system, the lower liquidus groove lies at higher silica side along 3CaO·P2O5–MgO-SiO2, in accord with the results of cone fusion and melting point measurements already obtained by Kiyoura and Sata.

Maki, Nobufumi; Shimura, Yoichi; Tsuchida, Ryutaro

doi: 10.1246/bcsj.31.413pmid: N/A

1. In neutral and unbuffered solution of 0.1 f potassium chloride, 0.1 f potassium thiocyanate, or 1 f potassium thiocyanate, the complex ion, [Cr(NH3)n(NCS)6−n]n−3 and [Cr en3]3+ were all reduced irreversibly in two steps at the dropping mercury electrode. The first diffusion current corresponds to the reduction, chromium(III)→chromium(II), and the second to the reduction, chromium(II)→chromium(0).2. In the solution of 0.1 f potassium chloride, the polarograms of [Cr en2X2]+ type complexes show three waves. Each of the first two waves, corresponding to a gain of one electron, represents the reduction of chromium(III) to chromium(II) and the last wave, corresponding to a gain of two electrons, represents the reduction to the metallic state. As regards the first two waves, the former wave represents the reduction of the original chromium(III) complexes to chromium(II) state and the latter represents the reduction of the aquated chromium(III) complexes to chromium(II) state.3. In agreement with the results obtained for cobalt(III) complexes by Holtzclaw et al., the trans isomer of [Cr en2(NCS)2]+ has a little more negative half-wave potential than the corresponding cis-form.4. The polarographic stabilities of chromium(III) complexes increase in the following order of the ligands:Cl^-<NCS^-<en<NH_35. The catalytic effects on the double wave of oxygen have been found for [Cr(NH3)2(NCS)4]−, [Cr(NCS)6]3−, or cis-[Cr en2(NCS)2]+. Such special polarographic behavior was not found in the other chromium(III) complexes.

Morosawa, Shiro

doi: 10.1246/bcsj.31.418pmid: N/A

Morino, Yonezo; Hirota, Eizi

doi: 10.1246/bcsj.31.423pmid: N/A