Cyclization of α-haloamide with internal double bond by use of the low-valent metal complex

The α-haloamide having internal double bond was allowed to react with a catalytic amount of Pd(PPh₃)₄ in the presence of proton sponge to produce a cyclized product in a fairly good yield possibly through the intermediation of σ-alkylmetal complex although it was not isolated.     

Local interaction energy of carbon and nitrogen atoms in FFC γ-iron

A Mossbauer effect study has been done for Fe−C and Fe−M−C (M: Al, Mn) γ-iron. From the obtained fractional intensity of each component of spectra, the local interaction energies between carbon atoms were determined by means of Monte-Carlo simulation. The interaction energiees between carbon atoms and M atoms are also derived.     

Design of multiple layered a-Si:H(F)/a-SiGex:H(F) films for enhancement in photoresponse in the near-infrared spectrum

Photo-electric properties of a-Si:H(F)/a-SiGe_x:H(F) multilayer films were investigated by measurements of optical absorption, and photoconductivity in both steady and transient modes with the repetition length and the difference in the optical gap between a-Si:H(F) and a-SiGe_x:H(F) as the variables. Measurements of primary photocurrent clarified that photosensitivity for the multilayer films extended to longer wavelengths of around 725 nm, while high resistivity was maintained despite of lowering the band gap.The drift mobility of electrons was measured by the time-of-flight technique, showing 10^–2-10^–3 cm²/Vs, while the drift mobility-lifetime products of electron was maintained to be 10^–7 cm²/V. On the other hand, the drift mobility of holes was 10^–3 cm²/Vs, which was the similar magnitude to that of a-Si:H(F).     

Reproducibility of sample separation using liquid or forced air convection thermostatted high performance capillary electrophoresis systems

Run-to-run sample separation reproducibility has been compared on two commercial high performance capillary electrophoresis units which differ in the mode by which the capillary temperature is thermostatted. Three standard analytes, differing dramatically in molecular character and size, were used for the analysis: benzoic acid, a 14 amino acid peptide from human chorionic gonadotropin, and ribonuclease A represent, respectively, small stable organic molecules, small peptides with little or no secondary structure, and proteins with secondary structure. These standards were evaluated with regard to reproducibility of migration time, peak area, and peak height. The analyses, performed in buffers of optimum pH for the separations, demonstrated that the liquid and forced air convection thermostatted systems both performed extremely well. The reproducibility, as judged by the percent coefficient of variance (% CV) of replicate analyses, was generally found to be less than 1 % (migration time); the reproducibility decreased in the order migration time > peak height > peak area. Whereas the absolute % CV values for MT_rel (migration relative to a standard) observed with the liquid thermostatted system were 2- to 4-fold lower than those observed with the forced air convection thermostatted system, there was little statistically significant difference between the two. As expected, the data indicated a reduction in reproducibility as the complexity of the analyte increased, perhaps as the result of an increased potential for wall interactions. Comparing separations in which low (≈?1 watt/meter [W/m] of capillary) and high (>5 W/m) Joule heat was generated by altering the sodium chloride content of the buffer revealed few statistically significant differences in the reproducibility obtained from the two systems. With these particular standard analytes and their respective buffer systems, there appears to be little difference between forced air convection and liquid thermostatting of the capillary.     

Bemerkung über die Erstarrungszeit der umkehrbaren Sol-Gel-Umwandlung

Ohne Zusammenfassung Herrn Prof. Dr. Shun-ichiro Imamura, Kyoto Universit?t, sprechen wir an dieser Stelle für seine wertvollen Ratschl?ge unseren besten Dank aus.     

On the stability of Cartan embeddings of compact symmetric spaces

Dedicated to Professor Tadashi Nagano on his sixtieth birthday