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The chromatographic behaviour of several synthetic peptides related to the antibiotic peptide gratisin was investigated using reversed-phase high-performance liquid chromatography. The influence of the concentration of the peptides, column temperature and flow-rate on the chromatographic separation was examined. Of these peptides, some analogues with the D-X-D-Y-L-Pro or L-Pro-D-X-D-Y sequences and strong activities gave double peaks in the chromatogram. The isomeric conformers were separated from each of the double peaks and were in equilibrium with each other at low temperatures. It is proposed that the presence of the sequences of D-X-D-Y-L-Pro and L-Pro-D-X-D-Y in these peptides gives rise to the stabilization and various degrees of hydrophobicity of their conformers. 相似文献
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Shinjiro Hara;Wei Dai;Ryoma Horiguchi;Wataru Kanetsuka;Masashi Akabori; 《physica status solidi b》2024,261(3):2300529
In this article, the results of incremental analysis on the thickness, aspect ratio, and crystallographic substrate orientation dependence of magnetic domain formation in CoFe nanolayer patterns (NPs) on GaAs (001) substrates by magnetic force microscopy are reported. All the 35 nm thick CoFe NPs show multiple magnetic domains under as-deposition condition whereas the 13 nm thick CoFe NPs have a single magnetic domain in the case of the patterns with a relatively small size and high aspect ratio. Subsequently, the magnetic fields are applied in the direction parallel to the <110> and <1–10> directions of the substrates to analyze a magnetization switching behavior in the patterns. The results reveal that the magnetic fields required for magnetization switching markedly tend to increase, with decreasing the thickness of the patterns and increasing their aspect ratio. A general tendency is obtained, which a higher magnetic field is needed for a higher aspect ratio and a thinner thickness of the NPs. Even in the case of the patterns with an aspect ratio of unity and a thickness of 35 nm (but, a smaller size), a single magnetic domain is formed at a relatively high applied magnetic field of 1500 Gauss. 相似文献
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Hirokazu Hayashi Hiromichi Hagiya Seong-Yun Kim Yasuji Morita Mitsuo Akabori Kazuo Minato 《Journal of Radioanalytical and Nuclear Chemistry》2013,296(3):1275-1286
Curium was separated and recovered as an oxalate from a Cm–Pu mixed oxide which had been a 244Cm oxide sample prepared more than 40 years ago and the ratio of 244Cm to 240Pu was estimated to 0.2:0.8. Radiochemical analyses of the solution prepared by dissolving the Cm–Pu mixed oxide in nitric acid revealed that the oxide contained about 1 at% of 243Am impurity. To obtain high purity curium solution, plutonium and americium were removed from the solution by an anion exchange method and by chromatographic separation using tertiary pyridine resin embedded in silica beads with nitric acid/methanol mixed solution, respectively. Curium oxalate, a precursor compound of curium oxide, was prepared from the purified curium solution. 11.9 mg of Cm oxalate having some amounts of impurities, which are 243Am (5.4 at%) and 240Pu (0.3 at%) was obtained without Am removal procedure. Meanwhile, 12.0 mg of Cm oxalate (99.8 at% over actinides) was obtained with the procedure including Am removals. Both of the obtained Cm oxalate sample were supplied for the syntheses and measurements of the thermochemical properties of curium compounds. 相似文献