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生物电化学连接生物技术和电化学科学,纳米技术打开了这个领域科学研究新境界。由于许多生物活性分子,例如细胞色素C的氧化还原中心通常位于生物分子内部,所以其氧化还原中心与电极之间的直接电子传递很难实现。本文首先通过在金电极上分别修饰己二硫醇和苯二硫醇的自组装单层SAMs,然后再将修饰了金纳米颗粒(AuNPs)的多壁碳纳米管(MwcNTs)固定于SAMs上,然后再修饰上细胞色素C,利用金纳米颗粒和碳纳米管良好的导电性和宏观隧道效应,实现了对细胞色素C的直接电化学。并将该修饰电极用于对H202的催化研究。 相似文献
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建立了一种准确简便的分析布洛芬含量的方法,在药物监测方面推广使用。采用电聚合法制备基于银掺杂聚L-精氨酸修饰金电极的布洛芬药物传感器。研究了布洛芬在修饰电极上的电化学行为。结果表明,该传感器对布洛芬的氧化具有良好的催化作用,检出限(信噪比为3)为1.607×10-8mol/L,线性范围为1.0×10-8~1.0×10-4mol/L。该传感器的选择性高,并具有良好的重现性和稳定性。用于药物样品的测定,回收率在95.1%~103.3%之间。 相似文献
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碳纳米材料以其优异的导电特性和机械特性及极佳的生物相容性而引起研究者的极大兴趣,在电化学生物传感器的开发和研究中极具应用价值。碳纳米材料在电化学生物传感器方面的应用主要是将碳纳米材料作为传感器界面的修饰材料、生物分子的固载基质以及信号标记物等。文章综述了碳纳米材料在电化学生物传感器中的应用,并展望了未来碳纳米材料的研究方向。 相似文献
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构筑了乙酰胆碱酯酶/Nafion/丝网印刷电极(AChE/Nafion/SCE)修饰电极,研究该修饰电极在羧酸二茂铁与羧酸二茂铁和氯化乙酰巯基胆碱混合溶液中的电化学行为,建立测定有机磷农药-马拉硫磷的计时电流法。该传感器与固体电极所制传感器相比,具有制备简单,灵敏度高,体积小,使用简单,酶膜稳定不易脱落,测量电流稳定,制造成本低等优点。 相似文献
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Dinesh Singh J. K. Gehlawat Musti S. Rao 《Journal of chemical technology and biotechnology (Oxford, Oxfordshire : 1986)》1990,47(2):127-136
Oslefins and diolefins are important intermediates in the petrochemical industry and the future promises a further substantial increase in demand. While several catalysts have been formulated in the past for the abstraction of hydrogen from butenes and propylene, these catalysts are inefficient in the abstraction of first hydrogen from butane. Bismuth molybdates (β and γ-phases) containing iron oxide and supported on alumina are used as catalysts in the present investigation on the oxidative dehydrogenation of n-butane. Effects of catalyst content, temperature and oxygen: n-butane ratio on conversion and selectivity to butadiene and (C4H8 + C4H6) are studied in the following ranges of experimental conditions: β-bismuth molybdate/100 mol support I(K), 3–9; γ-bismuth molybdate/100 mol support I(K), 5-20; temperature, 400–500°C; O2: butane ratio, 0.6:1.7. 相似文献
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考登钢作为一种高耐候结构钢,广泛应用于各个领域。在火力发电方面,考登钢主要应用在工作环境比较恶劣的烟气加热器和空气预热器中。考登钢表面涂搪的目的就是进一步提高其耐腐蚀性能,延长使用寿命。为了提高考登钢元件的使用寿命,对考登钢表面涂搪瓷的可行性、密着性能、瓷釉、工艺控制、质量保证等方面进行了研究。 相似文献
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A viscometer used to measure the viscosity of 10 μl of a liquid, must be miniaturized down, and the liquid velocity gradient in the channel used to determine the viscosity coefficient. Two major factors that affect the liquid velocity are the mechanical forces exerted by the mechanical motors and electromagnetic forces. In this study, electrowetting on dielectric (EWOD) is adopted to drive liquids. Variously sized electrodes on a chip, and two shapes of channel are employed to measure the velocity gradient to determine the viscosity coefficient. The device is fabricated by microelectromechanical system (MEMS) technology. The dielectric layer used in EWOD has a high dielectric constant, BST (Ba0.7Sr0.3TiO3), to reduce the required applied voltage; its surface is coated with hydrophobic polymer, polytetrafluoro-ethylene (PTFE, Teflon® AF DuPont). Experimental results demonstrate that liquids can be pulled at 660 μm/s in linear channels by applying a voltage of 15 V. 相似文献
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采用实验方法考察工艺参数对沉降斑的影响。基于一个带凸台的平板模具,采用L27(313)正交矩阵进行实验,研究了几何尺寸、熔体温度、注射时间、保压压力及保压时间对厚度突变处沉降斑形成的影响,同时还考虑了熔体温度和注射时间以及保压压力和注射时间之间的交互作用影响;通过性噪比分析和F检验优化成型工艺条件并对工艺参数的影响进行显著性分析。结果表明,对于厚度突变的平板制品,厚度突变的程度对其沉降斑形成的影响最大,其次为熔体温度,保压压力,保压时间等;采取减小厚度变化,降低熔体温度或增加保压压力和保压时间等措施,可以减小厚度突变处沉降斑,从而减少其对外观质量的影响;因素之间的交互作用对制品沉降斑的形成有一定的影响,熔体温度B和注射时间C之间的交互作用影响较为明显,而保压压力D和注射时间C之间的交互作用对该质量指标的影响最小,可以并入误差。 相似文献
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In reexamining medium effects on photochemical reactions, we have emphasized those on unequilibrated excited species such as the Franck-Condon species. Despite recent advances in femtochemistry, such a discussion in molecular photochemistry is uncommon, and the problem remains challenging on account of the extremely short-lived excited species. However, in such cases, a small perturbation resulting from, for example, weak guest-host interactions could turn into a determining factor in dictating the course of a photochemical channel of deactivation. Examples of medium-directed diabatic processes have been examined with this idea in mind. A modified view on rhodopsin photoisomerization is presented along with the consideration that confinement does not necessarily lead to inhibition of reactions of the trapped substrate. 相似文献
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研究了温度和pH值对漆酶酶活以及漆酶处理纤维压制纤维板性能的影响。结果表明,pH较低、温度较高时漆酶酶活较高,压制的纤维板强度性能较好。但温度太高(60~80℃),延长加热时间,漆酶稳定性变差,酶活明显降低,压制纤维板的强度下降。 相似文献