Curve-of-growth analyses with respect to ζ Cap for the coolest BaII star HD 121447 and the CS star R CMi have been made, and physical parameters and relative abundances of the elements have been determined. In HD 121447 s-process elements are overabundant by factors of about 10-30, while in R CMi they are overabundant by factors of about 30-100.
Precise isotopic abundance ratios of molybdenum were measured for three iron meteorites, Canyon Diablo, Hardesty and Sikhote-Alin, together with terrestrial molybdenites. Of these samples studied, the Sikhote-Alin iron meteorite was found to show a peculiarity in Mo isotopic abundance ratio; (i) a general anomaly, i.e., a smooth decrease from mass number 92 through 98 (or 100?), (ii) a special positive anomaly (14.9 ε) at mass number 96, and (iii) a special positive anomaly (50.1 ε) at mass number 100. (The latter two values of“anomaly”refer to the deviations relative to the general trend.)
Micron-size monodisperse polymer particles were prepared by dispersion copolymerization of methyl methacrylate with a hydrophilic poly(2-oxazoline) macromonomer in an aqueous methanol solution, in which the macromonomer acted as a comonomer as well as a stabilizer. A small amount of the macromonomer was sufficient to produce such polymer particles. The particle size decreased with increasing the amount of the macromonomer. From ESCA analysis of the particles, poly(2-oxazoline) chains were found to be locally present on the surface.
Aluminum porphyrin is an excellent catalyst for the synthesis of polymers from a wide variety of monomers such as epoxide, lactone, and methacrylic ester, to give the polymers with controlled molecular weight. A novel catalyst system composed of aluminum porphyrin and an organoaluminum compound with bulky substituents brings about a remarkably accelerated reaction retaining the controlled molecular weight of the polymer.
The mdx mouse has X-chromosome linked myopathy due to dystrophin deficiency, and is therefore used as a model of human Duchenne muscular dystrophy. As the mdx mouse bears a point mutation resulting in a stop colon in the middle of the dystrophin gene, most of its muscle fibers are not stained in immunohistochemistry with anti-dystrophin antisera. However, a clear immunostaining occurs on the cell membrane in a small number of fibers. We characterized these rare positive fibers in the present study with five different antibodies raised against various regions of dystrophin. They were stained with four of them inluding those raised against the N- and C-terminals of dystrophin. However, they were not stained with antibody Dy4/6D3 raised against the middle region of dystrophin close to the site corresponding to the mdx mutation. The staining could not be explained by the expression of the dystrophin related protein, an autosomal homologue of dystrophin. We tentatively concluded that the positive staining is due to truncated dystrophin lacking the region corresponding to the mdx mutation.