Revised structures of cymbopogone and cymbopogonol

The structures of cymbopogone and cymbopogonol were revised to D:A-friedo-18β,19αH-lupan-3-one and D:A-friedo-18β,19αH-lup-4(23)-en-3β-ol, respectively.     

Magnetic anisotropy of amorphous (Fe1−x Co x )78Si10B12 alloys

In order to better understand the problem of magnetic anisotropy in amorphous alloys produced by a rapidly quenching technique, in-plane magnetic anisotropy of amorphous (Fe_1−x Co _x (₇₈Si₁₀B₁₂ alloys was measured by means of a torque magnetometer using a disk specimen made from the amorphous alloy ribbon. The amorphous ribbons were prepared by a single roller type quenching apparatus. It was found that the anisotropy had mostly twofold symmetry in all the alloy cases, and that the concentrationx dependence of the anisotropy constant behaved differently from that of the magnetostriction. Moreover, the anisotropy did not disappear by subsequent annealing at high temperatures where the internal stress relief and the crystallization were completed.     

Studies on gastric antiulcer active agents. II. Synthesis of tetrazole alkanamides and related compounds

A series of tetrazole alkanamides was synthesized and tested for antiulcer activity against acetic acid-induced gastric ulcer in rats. These compounds were prepared by the reaction of tetrazole alkanoic acids and various amines by the mixed anhydride method or acid chloride method. Among them, 3-[(1-ethyl-5-tetrazolyl)methylthio]propionamide (IIn) was found to have the most potent activity. The structure-activity relationships are discussed.     

Anomalous frequency dependence of giant quantum attenuation in Bismuth below 1 K

Giant quantum attenuation of longitudinal sound waves in Bi has been measured at temperatures down to 8 mK for the case that the electron (n = 0, s = + 1) and hole (n = 1, s = ? 1) Landau levels cross simultaneously Fermi level at a field of about 90 kOe. The temperature and frequency dependences of the peak attenuation due to these two levels are expressed by α_p ∝ T^-μω^ν with $\text{μ ? 1}$ and $\text{ν ? 1}$ at T > 1 K. When T ? 1 K the value of μ decreases by decreasing temperature and below 0.1 K, α_p takes almost constant value. At T ? 0.5 K, ν becomes larger than 1 and maximum value of ν observed is 2 at T ～ 0.05 K. These features of the attenuation peak at very low temperatures are consistent with what are expected in the fluctuation region of the gas-liquid type transition of the electron-hole system.     

High-spin states in148Tb

High spin states of¹¹⁷Xe have been investigated by means of in-beam γ-ray spectroscopy using the reaction⁹²Mo(²⁸Si, 2pn) at beam energies of 100 to 120 MeV. The previously known νh_11/2 bands are confirmed and the νg_7/2 favored-signature band is extended up to 47/2⁺, in which two band crossings are observed at ?ω=0.33 and 0.44 MeV, respectively. Two new positive-parity bands have been established, one of which is most likely the νg_7/2 unfavored-signature band. A new transition cascade with irregular level spacings is also observed.     

A cytotoxic constituent of Lysimachia japonica THUNB. (Primulaceae) and the structure-activity relationships of related compounds

A cytotoxic alkylresorcinol was isolated from Lysimachia japonica THUNB. (Primulaceae) and identified as grevillol (2). It was tested for cytotoxicity against KB, B-16, PC-13, L-5178Y, P-388, and HEp-2 cells in vitro. Synthetic related compounds were also tested for cytotoxicity against the KB cell line, and the structure-activity relationships are discussed.     

HRTEM study of new superconducting lead cuprate (Pb, Cu) (Eu, Ce)2(Eu, Sr)2Cu2Oz

Crystallographic properties of a new lead cuprate superconducting material (Pb, Cu) (Eu, Ce)₂(Eu, Sr)₂Cu₂O_z are examined by electron probe micro-analysis and transmission electron microscopy. It is confirmed that although the sample examined here is not of single-phase, the composition of the superconducting phase is close to the nominal composition. From TEM observations, it follows that the crystal structure of the new phase is similar to that of Tl-1222 which consists of a fluorite type block, a rock salt type layer and a perovskite block.