1000 resultados para 10050840 MOCNESS-11


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合成了具有磁铅石结构的Sr1-xLaxNiAl11O19系列催化剂,并用XRD、UV-DRS、H2-O2滴定及Py-IR等方法对其体相及表面性质进行了表征.结果表明,La3+离子能够同晶取代Sr2+离子进入催化剂晶格内部;随着La3+含量增加,催化剂的结晶度提高,从而降低了镍的还原性,并使金属镍在表面上的分散度略有提高;在SrNiAl11O19中掺入La3+离子,能够抑制晶体沿c轴方向的生长,提高其比表面积;同时La3+离子对Sr2+离子的调变,减少了表面的酸中心数目

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对具有磁铅石结构的Sr1-xLaxNiAl11O19对甲烷与二氧化碳重整反应的催化活性、积炭量和稳定性进行了研究.不同还原温度下催化剂的XRD和催化活性的实验结果表明,金属镍是CH4+CO2重整反应的活性组分,金属镍含量越大,反应活性越高.反应后催化剂积炭量的分析结果说明,在相同镍含量和分散度的情况下,La3+离子对Sr2+离子调变,可以降低催化剂的表面酸性,提高催化剂的抗积炭能力.LaNiAl11O19是一种具有较好催化活性、稳定性和抗积炭性能的催化剂.

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采用电解法制备了未见文献报道的杂多蓝H8[SiMo11Co(H2O)O39]·20H2O,通过X-射线衍射测定了其晶体结构,该晶体属单斜晶系,空间群P21;。晶胞参数全矩阵最小二乘法修正至中心原子Si与4个氧形成四面体结构,配原子M(M=11/12Mo+1/12Co)与O形成12个MO6八面体结构3个MO6共边形成4个M3O13三金属簇,4个三金属簇与SiO4四面体共角相连形成阴离子结构。

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在完成了眼镜王蛇毒液抽提物CM-11的残基质子谱峰归属和二级结构的判定后,利用1H的NOESY谱和DQF-COSY谱选取了距离约束、测定了Φ角和χ1,并做了部分β1H的立体归属。利用度量矩阵距离几何法计算了其三维空间结构,并进行了结构的优化。同一个系列中挑选的12个低能分子结构中,骨架的RMSD为0.14nm,所有重原子的RMSD为0.20nm,所有的距离约束偏差不超过0.05nm,二面角的偏差不超过3°

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2DNMR谱的自动归属是核磁共振发展的一个方向,CAPRI即是蛋白质1H谱的计算机辅助谱峰归属的一种程序。作者将其应用于眼镜王蛇神经毒素CM-111H谱的归属,讨论了CAPRI的功能和特点以及运用在CM-11后得到的分析结果。

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对不同温度热处理过的Nylon-11样品,采用广角X射线衍射(WAXD),根据X射线衍射强度理论,用多重峰图解分峰方法研究了Nylon-11结构的变化,并导出了计算Nylon-11结晶度的公式.所得结果与密度法、DSC法进行了比较.同时也给出了Nylon-11的有关热力学参数

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合成了六铝酸盐SrNiAl11O19并用XRD、UVDRS、TGDTA和TEM等技术对其进行了表征。在750℃于SrNiAl11O19上进行的甲烷与二氧化碳重整反应表明,这类催化剂较Ni/SrAl12O19具有较大活性和低积碳能力,在催化反应过程中可有效地抑制Ni颗粒的增大。

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The aggregate structure of the discotic compound 2,3,6,7,10,11-hexakispentyloxytriphenylene (HPT) was studied both for the crystalline state and the liquid crystalline state by using electron crystallography and a molecular simulation approach. In the crystalline state, HPT was found to adopt an orthorhombic P-2212 space group with cell parameters a = 36.73 Angstrom, b = 27.99 Angstrom and c = 4.91 Angstrom. Molecular packing calculations were conducted to elucidate the molecular conformation and mutual orientational characteristics in the different states. Phase transitions and relationships are discussed from a structural point of view.

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The king cobra(Ophiophagus hannah) neurotoxin CM-11 is long-chain peptide with 72 amino acid residues. Its complete assignment of H-1-NMR resonances was obtained using various 2D-NMR technologies, including DQF-COSY, clean-TOCSY and NOESY.

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The king cobra neuotoxin CM-11 is a small protein with 72 amino acid residues. After its complete assignments of H-1-NMR resonance's were obtained using various 2D-NMR technologies, including of DQF-COSY, clean-TOCSY AND NOESY, the secondary structure was analysed by studying the various NOEs extracted from the NOESY spectra and the distribution of chemical shifts. The secondary structure was finally determined by MCD as follows: a triple-strand antiparallel beta sheet with I20-W36, R37-A43 and V53--S59 as its beta strands, a short alpha helix formed by W30-G35 and four turns formed by P7-K10, C14-G17, K50-V53 and D61-N64.

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Tb(111) and Ca(11) ion equilibria in the Presence of glutamic acid and glutamine were studied by potentiometric titration at 37 degrees C and an ionic strength of 0.15mol/L(NaCl). The stability constants for Tb(111) and Ca(11) complexes in the systems were obtained. The species and their distribution in the systems were discussed.

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眼镜王蛇抽提物CM-11为含72个残基的长链神经毒素,对其进行了DQF-COSY,TOCSY和NOESY等一系列2D-NMR谱测定,借助序列专一归属法完成了CM-11NMR氢谱的完整归属。

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眼镜王蛇毒液抽提物CM-11为含72个残基的长链神经毒素,对其进行了DQF-COSY,TOCSY和NOESY等一系列2D-NMR谱测定,通过系统地分析各种NOE信息、化学位移的分布等数据推测了蛋白质有规律二级结构,最后利用MCD主链引导法确定了它的二级结构。其中有三段反平行β折叠股(I20~W26、R37~A43和V53~S59)、一段α螺旋构象(W30~G35)和四个可能的转角(P7~K10,C14~G17,K50~V53,D61~N64),蛇毒神经毒素CM-11其他肽片段处在伸展构象。

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采用水热合成与离子交换方法,将中心原子为过渡金属(Fe)的钨系过渡金属取代型杂多阴离子FeW_(11)NiO_(39)(H_2O) ̄(7-)(缩写为FeW_(11)Ni)嵌入ZnAl型阴离子层状结构粘土间,获得了大层间距、通道高度达1.32nm的新型层柱微孔化合物。通过XRD、IR及ESR等手段进行了表征。以ZnAl-Few_(11)Ni为催化剂合成邻苯二甲酸二辛酯(DOP),选择性大于99%,转化率由嵌入前的12%提高到近50%,催化活性明显提高。