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991.
某些生物分子在C60—γ—环糊精/Nafion化学修饰电极上的电催化行为 总被引:4,自引:0,他引:4
研究了C60-γ-环糊精(C60-γ-CD)(1:1)/Nafion和C60-γ-CD(1: 2)/Nafion化学修饰电极在水溶液中的电化学行为,发现它们都有一对一电子转移的可逆表面波,而且它们对某些生物分子有电催化作用。 相似文献
992.
Nianqin Jie Zhikun Si Jinghe Yang Qiang Zhang Xirong Huang Duanling Yang 《Mikrochimica acta》1997,126(1-2):93-96
A fluorescence quenching method has been developed to determine cerium with rhodamine 6G. The method is based on the oxidation of rhodamine 6G by cerium(IV) in sulfuric acid solution. The linear calibration range is 4.0 × 10–7 -1.6 × 10–6mol/L. The detection limit is 1.0 × 10–7 mol/L. The relative standard deviation was 1.0% (n = 5). The method has been used to determine cerium in rare earth ores, with satisfactory results. The method offers the advantages of simplisity, sensitivity and selectivity. 相似文献
993.
994.
巢湖、龙感湖水体中稀土元素的无机形态研究 总被引:7,自引:0,他引:7
运用MINTEQ化学平衡软件对巢湖、龙感湖中溶解态稀土的形态进行模拟。模拟结果表明,在巢湖和龙感湖中Ln(CO3)^2-,LnCO3^+是溶解态稀土的最主要的存在形式,当8pH〉7.19时,REE主要以LnCO3^+形式存在,当pH〉8时,REE主要以Ln(CO3)2^-形式存在,并且∑Ln(CO3)n^3-2n(n=1和2)形态的稀土基本上占溶解态稀土总含量的93%以上。Ln^3+在巢湖和龙感湖水体中平均丰度为5.03%,Ln^3+的丰度和pH值成反相关关系。LnPO4在湖水中平均丰度为1.61%,但这种形式的稀土在巢湖和龙感湖中非常重要。巢湖和龙感湖中LREE的LnPO4均处于过饱和状态,甚至巢湖西半湖区丰水期HREE的LnPO4的也都处于过饱和状态,PO4^3+对稀土的存在有很强的限制作用。InSO4,LnF^2+,LnOH^2+,LnCl^3+等形态的各元素平均丰度均小于1%,在富营养化的淡水中通常可以忽略不计。 相似文献
995.
Summary The effect of transition metals (Cr, Mn, Fe, Co, Ni and Cu) on the selective hydrogenation of cinnamaldehyde (CMA) to the
corresponding semi-hydrogenated product over Pt/CNTs catalyst has been studied in ethanol at 343 K under 2.0 MPa H2 pressure. PtNi/CNTs catalyst shows good catalytic activity and selectivity of C=C bond hydrogenation, 68.4% for conversion
of CMA and 97.0% for selectivity of hydrocinnamaldehyde (HCMA). PtCo/CNTs catalyst shows good catalytic activity and selectivity
of C=O bond hydrogenation, 91.3% for conversion of CMA and 88.2% for selectivity of cinnamylalcohol (CMO). 相似文献
996.
以电化学循环伏安、现场ESR电化学以及现场薄层电化学方法研究了电生Co(I)TPP与溴代五己烷的反机制。在DMF中,Co(Ⅱ)/Co(Ⅰ)的氧化还原有明显的催化溴代环己烷还原的特片,反现场有自由基生成,反应产物之一是Co-C键化合物,可以在1.30V(SCE)-电子还原,当存在CH2-CHCN时,。生成另一种Co-C键化合物,该化合物在-1.10V(SCE)处一电子还原,证明溴代环己烷与Co(I) 相似文献
997.
Wei-ping Gao Yu Bai Er-qiang Chen~ 《高分子科学》2005,(3):275-284
Small fixed aggregates of a poly(ethylene oxide)-block-polybutadiene diblock copolymer(PEO-b-PB)in THFsolution were obtained by adding a selective solvent for PB blocks,followed by cross-linking the PB shells.Themorphologies of the nanostructured particles with a cross-linked shell were investigated by atomic force microscopy andtransmission electron microscopy.The average behaviors of the PEO crystallization and melting confined within thenanostructured particles were studied by using differential scanning calorimetry experiments.For the deeply cross-linkedsample(SCL-1),the crystallization of the PEO blocks was fully confined.The individual nanoparticles only crystallized atvery low crystallization temperatures(T_cs),wherein the homogenous primary nucleation determined the overallcrystallization rate.For the lightly cross-linked sample(SCL-2),the confinement effect was T_c dependent.At T_c(?)42℃,thecrystallization and melting behaviors of SCL-2 were similar to those of the pure PEO-b-PB diblock copolymer.At T_c>42℃,SCL-2 could form PEO lamellae thicker than those of the pure PEO-b-PB crystallized at the same T_c. 相似文献
998.
Franks WT Zhou DH Wylie BJ Money BG Graesser DT Frericks HL Sahota G Rienstra CM 《Journal of the American Chemical Society》2005,127(35):12291-12305
Magic-angle spinning solid-state NMR (SSNMR) studies of the beta1 immunoglobulin binding domain of protein G (GB1) are presented. Chemical shift correlation spectra at 11.7 T (500 MHz 1H frequency) were employed to identify signals specific to each amino acid residue type and to establish backbone connectivities. High sensitivity and resolution facilitated the detection and assignment of every 15N and 13C site, including the N-terminal (M1) 15NH3, the C-terminal (E56) 13C', and side-chain resonances from residues exhibiting fast-limit conformational exchange near room temperature. The assigned spectra lend novel insight into the structure and dynamics of microcrystalline GB1. Secondary isotropic chemical shifts report on conformation, enabling a detailed comparison of the microcrystalline state with the conformation of single crystals and the protein in solution; the consistency of backbone conformation in these three preparations is the best among proteins studied so far. Signal intensities and line widths vary as a function of amino acid position and temperature. High-resolution spectra are observed near room temperature (280 K) and at <180 K, whereas resolution and sensitivity greatly degrade substantially near 210 K; the magnitude of this effect is greatest among the side chains of residues at the intermolecular interface of the microcrystal lattice, which we attribute to intermediate-rate translational diffusion of solvent molecules near the glass transition. These features of GB1 will enable its use as an excellent model protein not only for SSNMR methods development but also for fundamental studies of protein thermodynamics in the solid state. 相似文献
999.
Dibutyltin(IV) oxide reacts with the cantharidin analogue, 4′-(7-oxabicyclo [2,2,1]-5-heptane-2,3-dicarboximide) benzoic acid, A, to give the complexes [(p-C8H8NO3-C6H4-COOBu2Sn)2O]2 (1) and (p-C8H8NO3-C6H4-COO)2SnBu2 (2) which had been characterized by IR and 1H, 13C, 119Sn NMR. Single X-ray crystal structure analysis has been determined for compound (1), which was analogue to most other [(RCOOBu2Sn)2O]2. The dimer features central of Bu4Sn2O2 unit with the two Bu2Sn groups being linked via bridging oxygen atom. Each tin atom adopts distorted trigonal bipyramidal structures via two carbons from a dibutyl moiety and three oxygen atoms from cantharidin derivative and bridging oxygen atom. In vitro tests show compounds 1 and 2 exhibit high cytotoxicity against P388 and HL-60. 相似文献
1000.
The self-assembly of a novel series of donor-acceptor interaction-driven artificial hetero-duplexes in organic media has been described. Four linear compounds 1a-1d, bearing two to five electron rich 1,5-dioxynaphthalene units connected by the tetra(ethylene glycol) linker, respectively, have been prepared and used as donors, while eight compounds 2a-2d, 13-16, bearing one to four electron deficient pyromellitic diimide, 1,4,5,8-naphthalene-tetracarboxydiimide, or perylene-3,4,9,10-tetracarboxydiimide units, respectively, have been used as acceptors. The structure of the hetero-duplexes has been characterized by the 1H NMR, UV-vis spectroscopy and vapor pressure osmometry. It is revealed that the binding stability of the duplexes vary greatly, depending on the length and structure of the monomers and also the solvent, and hetero-duplex 1d·2d displays a maximum association constant of ca. 1.0×104 M−1 in chloroform. 相似文献