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141.
钨酸催化氧化环己酮合成己二酸 总被引:3,自引:1,他引:3
以钨酸-有机酸性添加剂为催化体系,在无有机溶剂和相转移剂的情况下,催化30%过氧化氢氧化环己酮合成己二酸。当钨酸∶有机酸性添加剂∶环己酮∶过氧化氢=11∶4∶01∶76(摩尔比,钨酸用量为2.5mmol)时,使用有机酸性添加剂来调节钨酸催化活性,结果表明以钨酸-磺酸水杨酸氧化环己酮效果最优,反应8h时己二酸分离产率达86.8%、纯度为99.9%;以间苯二酚或邻苯二酚为添加剂时,己二酸分离产率分别达到85.9%和84.5%,纯度约为100%;而不使用任何添加剂时,己二酸分离产率只有68.1%、纯度为95.2%。当使用磺酸水杨酸、草酸等为有机酸性添加剂时,随反应时间的延长,己二酸分离产率均升高。当磺酸水杨酸用量为2.5mmol时,己二酸分离产率和纯度均较高。钨酸-磺酸水杨酸和钨酸-草酸催化体系重复使用5次后,己二酸分离产率仍分别可达80.2%和80.9%。 相似文献
142.
水热沉积电压对C-AlPO_4涂层显微结构的影响 总被引:1,自引:1,他引:1
以方石英型磷酸铝(C-A1PO4)粉体为原料,异丙醇为溶剂,碘为荷电介质,采用水热电泳沉积方法在涂有SiC涂层的碳纤维增强碳(C/C-SiC复合材料表面制备了C-A1PO4外涂层.借助X射线衍射和扫描电镜表征了涂层的晶相组成和显微结构.研究了沉积电压对C-A1PO4涂层显微结构的影响,并测试了涂层的抗氧化性能.结果表明:在180~220V范围内,水热沉积电压对涂层的显微结构有较大的影响,220V时制备的涂层致密均匀.涂层的沉积量以及涂层与基体的结合强度随着沉积电压的升高而增加;单位面积沉积量与时间的二次方根之间符合线性关系.与包埋法制备的SiC涂层相比,水热电泳沉积法制备的C-A1PO4涂层具有更好的抗氧化性能,涂层样品在1500℃的空气中氧化37h后质量损失仅为0.53%. 相似文献
143.
144.
机构影响系数和并联机器人雅克比矩阵的研究 总被引:2,自引:0,他引:2
基于刚体运动学的原理,对机构影响系数进行了研究,用运动坐标系和拟牵连速度的概念给出了机构速度影响系数求解公式,揭示了机构影响系数的物理意义,明确地论证了机构速度影响系数只与机构瞬时位姿有关而与机构的真实速度无关的结论。并将该方法用于并联机器人的运动学研究,由此而给出了求解并联机器人的雅克比矩阵的方法。 相似文献
145.
146.
CA McGibbon DE Krebs CA Trahan SB Trippel RW Mann 《Canadian Metallurgical Quarterly》1999,14(1):52-58
The mitochondrial, inner-membrane-associated, reversible NADPH-->NAD transhydrogenase of adult Hymenolepis diminuta physiologically couples matrix-localized, NADP-specific "malic" enzyme with NADH-dependent anaerobic electron transport. Employing submitochondrial particles (SMP) as the source of enzyme activity and both spectrophotometric and fluorometric assessments, the present study made evident that in its catalysis of transhydrogenation between NADPH and NAD, the cestode enzyme engages in the concomitant transmembrane translocation of protons. As assessed spectrophotometrically, the catalysis of NADPH-dependent NAD reduction by H. diminuta SMP was stimulated significantly by carbonyl cyanide 3-chlorophenylhydrazone (CCCP), carbonyl cyanide 4-(trifluoromethoxy) phenylhydrazone (FCCP), as well as by the protonophoric anthelmintic, niclosamide. In addition, N,N'-dicyclohexylcarbodiimide (DCCD) markedly diminished SMP-catalyzed hydride ion transfer between NADPH and NAD. The catalysis by SMP of concomitant, transhydrogenase-mediated proton translocation was evaluated more directly via fluorometric assays using 8-anilino-1-napthalenesulfonic acid (ANS) as the probe. These latter evaluations revealed a transhydrogenase-dependent enhancement of ANS fluorescence in accord with an intravesicular accumulation of protons. ANS fluorescence was quenched rapidly when the assay system was supplemented with CCCP, FCCP, or niclosamide. Consistent with the helminth transhydrogenase acting as a proton pump, transhydrogenase-mediated enhanced fluorescence also was inhibited by DCCD. Considered collectively, these data indicated, apparently for the first time for any invertebrate system, that the transhydrogenase, in catalyzing the NADPH-->NAD reaction, acts in the translocation of protons from the matrix to the intermembrane space mitochondrial compartment. 相似文献
147.
JJ Fins FG Miller CA Acres MD Bacchetta LL Huzzard BD Rapkin 《Canadian Metallurgical Quarterly》1999,17(1):6-15
The contributions of the various ulnar-innervated muscles of the hand to the hypothenar compound muscle action potential (CMAP) were estimated by directly stimulating individual muscles and by analyzing CMAP shape changes resulting from manipulations that changed individual muscle lengths. The results show that the first peak of the negative phase of the hypothenar CMAP comes from the hypothenar muscles, but that the second peak is due to a large volume-conducted potential from the interosseous muscles. The interosseous contribution affects both the amplitude and the area of the CMAP, and makes these parameters sensitive to changes in the configuration of the fingers and the temperature gradient in the hand. To reduce the interosseous contribution, a "balanced reference" consisting of two reference electrodes, one over each tendon, is proposed. 相似文献
148.
CA Rohl FA Boeckman C Baker T Scheuer WA Catterall RE Klevit 《Canadian Metallurgical Quarterly》1999,38(3):855-861
The sodium channel initiates action potentials by opening in response to membrane depolarization. Fast channel inactivation, which is required for proper physiological function, is mediated by a cytoplasmic loop proposed to occlude the ion pore via a hinged lid mechanism with the triad IFM serving as a hydrophobic "latch". The NMR solution structure of the isolated inactivation gate reveals a stably folded core comprised of an alpha-helix capped by an N-terminal turn, supporting a model in which the tightly folded core containing the latch motif pivots on a more flexible hinge region to occlude the pore during inactivation. The structure, in combination with substituted cysteine mutagenesis experiments, indicates that the IFM triad and adjacent Thr are essential components of the latch and suggests differing roles for the residues of the IFMT motif in fast inactivation. 相似文献
149.
150.
AJ Chohan AD Kugelmass M Kida LR Pennington CA Sivaram 《Canadian Metallurgical Quarterly》1998,14(3):463-465
A cardiac transplant recipient with multiple coronary artery fistulae draining into the right ventricle is described. These fistulae presumably resulted from repeated endomyocardial biopsies. The diagnosis of coronary artery fistulae was made at the annual coronary arteriography. The magnitude of the shunt remained small over eight years of follow-up. 相似文献