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A radiochemical procedure is described for the simultaneous determination of238Pu,239+240Pu,241Pu,241Am,242Cm,244Cm,89Sr, and90Sr in vegetation samples. The method was applied for the determination of these, radionuclides in grass, collected near Munich after the fallout from the reactor accident at Chernobyl, USSR. The specific activities observed were (in Bq kg–1 dry weight):238Pu, 0.077;239+240Pu, 0.15;241Pu, 3.9;241Am, 0.031;242Cm, 3.0;244Cm, 0.008;89Sr, 2000;90Sr, 99. 相似文献
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Unexpected Silaazetidine Formation in the Thermolysis of thf‐Supported Silanimine Et2Si=N–SitBu3·thf
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The silyl amide Et2SiCl‐NLi‐SitBu3 can be cleanly prepared from precursor silylamine Et2SiCl‐NH‐SitBu3 and Li[nBu]. The CF3SO3SiMe3 induced LiCl elimination of Et2SiCl‐NLi‐SitBu3 in thf afforded a 2‐silaazetidine derivative by [2+2] cycloaddition of Et2Si=N–SitBu3 with Et2Si(OCH=CH2)–NH–SitBu3. X‐ray quality crystals of this 2‐silaazetidine derivative (triclinic, space group P$\bar{1}$ ) were grown from benzene at room temperature. The starting material for this approach, Et2SiCl–NH–SitBu3, is water‐sensitive. Hydrolysis of Et2SiCl‐NH‐SitBu3 gave [tBu3SiNH3]Cl along with (Et2SiO)n oligomers. The hydro chloride [tBu3SiNH3]Cl could be isolated and was characterized by X‐ray crystallography (trigonal, space group P$\bar{3}$ ). 相似文献
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Shanmei Cheng Dr. Scott A. Edwards Dr. Yindi Jiang Frauke Gräter Dr. 《Chemphyschem》2010,11(11):2367-2374
Post‐translational N‐glycosylation of proteins is ubiquitous in eukaryotic cells, and has been shown to influence the thermodynamics of protein collapse and folding. However, the mechanism for this influence is not well understood. All‐atom molecular dynamics simulations are carried out to study the collapse of a peptide linked to a single N‐glycan. The glycan is shown to perturb the local water hydrogen‐bonding network, rendering it less able to solvate the peptide and thus enhancing the hydrophobic contribution to the free energy of collapse. The enhancement of the hydrophobic collapse compensates for the weakened entropic coiling due to the bulky glycan chain and leads to a stronger burial of hydrophobic surface, presumably enhancing folding. This conclusion is reinforced by comparison with coarse‐grained simulations, which contain no explicit solvent and correspondingly exhibit no significant thermodynamic changes on glycosylation. 相似文献
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