نتایج جستجو برای: 2h isotope shift
تعداد نتایج: 178729 فیلتر نتایج به سال:
A novel HAuCl4@UiO-66-NH2 material has been obtained and utilized as a heterogeneous Au(III) catalyst. This Au(III) catalyst was able to promote the formation of a variety of dihydrochalcones starting from 2H-chromenes in moderate to good yields. A tandem hydride shift/hydration reaction sequence has been proposed based on deuterium labeling studies, which revealed a 1,5-hydride shift reaction ...
We calculate the corrections of orders α3, α4 and α5 to the Lamb shift of the 1S and 2S energy levels of muonic hydrogen (μp) and muonic deuterium (μd). The nuclear structure effects are taken into account in terms of the proton rp and deuteron rd charge radii for the one-photon interaction and by means of the proton and deuteron electromagnetic form factors in the case of one-loop amplitudes. ...
We have performed precision atomic spectroscopy of trapped radioactive Be isotopes aiming at studies of the charge and magnetization radii of these nuclei especially for a single-neutron halo nucleus Be. Some experimental results and the status of the analysis are discussed. PACS. 21.10.Gv Nucleon distributions and halo features – 21.10.Ft Charge distribution – 31.30.Gs Hyperfine interactions a...
Poliovirus type 2 Sabin mutants were selected for drug resistance and dependence by plating on HeLa cell monolayers in the presence of 3(2H)-isoflavene, a compound related to dichloroflavan, which prevents the shut-off of host translation and poliovirus RNA and protein synthesis. The drug-resistant mutants grew equally well in the presence and in the absence of the drug, while the drug-dependen...
1. In the presence of a high concentration ofp-nitrophenyl JJ-D-glucopyranoside (donor) the rates of production of p-nitrophenol and a transglucosylation product (1-glyceryl f,-D-glucopyranoside) increased, whereas the rate of production of glucose decreased with increasing concentration of glycerol in reactions catalysed by the.high-molecular-weight ,-glucosidase (fi-D-glucoside glucohydrolase...
The thermal conductivity temperature dependence kappa(T) of a hexagonal 2H-SiC silicon carbide crystal was calculated using the first-principle approach for orientation heat flux in basal plane and along axis c range from 100 to 500 K. effect carbon isotopic disorder on is considered. It found that, at 300 K, isotopically pure containing 100% 28 Si 12 C higher by 15.2% 12.4% directions across p...
The symmetry of the hydrogen bond in hydrogen cyclohexene-1,2-dicarboxylate monoanion was determined in chloroform using the NMR method of isotopic perturbation. As the temperature decreases, the (18)O-induced (13)C chemical-shift separations increase not only at carboxyl carbons but also at ipso (alkene) carbons. The magnitude of the ipso increase is consistent with an (18)O isotope effect on ...
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