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101.
K. Yagi Y. Aoki C. Rangacharyulu K. Matoba M. Hyakutake J. Nidome 《Physics letters. [Part B]》1973,44(5):447-448
Differential cross sections of (p, t) reactions exciting the 2+1 states in Te (A = 128 ? 120), Sn (116 and 114) and Cd (114 and 112) have been measured at Ep = 52 MeV. The observed differences of the angular distributions are interpreted by taking into account the two-step processes through inelastic scattering channels. 相似文献
102.
The y(1−y)-like maxima in Ni0.98S1−ySey are found beyond yc in the y-dependences of the coefficient of the T2 contribution to the resistivity and of the residual resistivity. Here, the critical concentration of the antiferromagnetic and less-conductive phase is determined to be yc = 0.095. 相似文献
103.
104.
Woithe K Geib N Zerbe K Li DB Heck M Fournier-Rousset S Meyer O Vitali F Matoba N Abou-Hadeed K Robinson JA 《Journal of the American Chemical Society》2007,129(21):6887-6895
OxyB is a cytochrome P450 enzyme that catalyzes the first phenol coupling reaction during the biosynthesis of vancomycin-like glycopeptide antibiotics. The phenol coupling reaction occurs on a linear peptide intermediate linked as a C-terminal thioester to a peptide carrier protein (PCP) domain within the multidomain glycopeptide nonribosomal peptide synthetase (NRPS). Using model peptides with the sequence (R)(NMe)Leu-(R)Tyr-(S)Asn-(R)Hpg-(R)Hpg-(S)Tyr-S-PCP and (R)(NMe)Leu-(R)Tyr-(S)Asn-(R)Hpg-(R)Hpg-(S)Tyr-(S)Dpg-S-PCP (where Hpg = 4-hydroxyphenylglycine, and Dpg = 3,5-dihydroxyphenylglycine), or containing (R)Leu instead of (R)(NMe)Leu, attached to recombinant PCPs derived from modules-6 and -7 in the vancomycin NRPS, we show that cross-linking of Hpg4 and Tyr6 by OxyB can occur in both hexapeptide- and heptapeptide-PCP conjugates. Thus, whereas OxyB may act preferentially on a hexapeptide still linked to the PCP-6 in NRPS subunit-2, it is possible that a linear heptapeptide intermediate linked to PCP-7 in NRPS subunit-3 may also be transformed into monocyclic product. For turnover, OxyB requires electrons, which in vitro can be supplied by spinach ferredoxin and E. coli flavodoxin reductase. Turnover is also dependent upon the presence of molecular oxygen. The model substrate (R)(NMe)Leu-(R)Tyr-(S)Asn-(R)Hpg-(R)Hpg-(S)Tyr-S-PCP is transformed into cross-linked product by OxyB with a kcat of 0.1 s-1 and Km in the range 4-13 muM. Equilibrium binding of this substrate to OxyB, monitored by UV-vis, is accompanied by a typical low-to-high spin state change in the heme, characterized with a Kd of 17 +/- 5 muM. 相似文献