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A flashing ratchet model of a two-headed molecular motor in a two-dimensional potential is proposed to simulate the hand-over-hand motion of kinesins.Extensive Langevin simulations of the model are performed.We discuss the dependences of motion and efficiency on the model parameters,including the external force and the temperature.A good qualitative agreement with the expected behavior is observed. 相似文献
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电荷转移络合物分光光度法测定磺胺脒的研究 总被引:1,自引:0,他引:1
研究了电子给体磺胺脒与电子受体对苯醌之间的荷移反应。结果表明 ,在乙醇介质中磺胺脒与对苯醌能形成橙红色电荷转移络合物 ,且反应体系的pH范围较宽。络合物的最大吸收波长λmax=497.6nm ,表观摩尔吸光系数为 2 .3 5× 1 0 3L·mol- 1 ·cm- 1 ,比耳定律的线性范围是 0~ 5 0mg/L ,络合比为 1∶2。应用拟定的方法测定磺胺脒制剂的含量 ,平均回收率为 1 0 0 .4% ,可用于磺胺脒制剂的分析。 相似文献
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In this paper, we present a model of the Brownian motor in a feedback controlled ratchet, in which the application of the flashing potential depends on the state of the particle to be controlled. We derive an analytical expression for the velocity induced by the feedback ratchet, which is a function of several parameters, including the ratio of the two switching temperatures and the asymmetry parameter of the potential field. The motor shows a current inversion when either parameter is varied. 相似文献
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采用二次干燥的化学共沉淀法制备出了LiNi0.5Mn1.5O4电池正极材料的前躯体.通过研究反应物浓度、聚沉剂、滤饼含水量和干燥方式等对产物品体结构和振实密度的影响,得到制备高密度锂离子电池正极材料前躯体的适宜条件为:NiSO4为0.375 mol/L,少量多次的添加聚沉剂,滤饼含水量为28%以及采用二次干燥的方式;该... 相似文献
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本文以六水硝酸锌(Zn(NO_3)_2·6H_2O)和2-甲基咪唑为原料,在不同溶剂条件下(甲醇、乙醇和水)制备前驱体金属有机框架化合物ZIF-8。接着,采用热重(TG)、红外光谱(FTIR)、X射线粉末衍射(PXRD)、紫外-可见漫反射光谱(UV-vis DRS)和扫描电镜(FE-SEM)等手段对前驱体ZIF-8和目标产品Zn O进行了表征。以亚甲基蓝为模拟污染物,考察了不同溶剂可见光下制备Zn O的光催化性能及催化剂的稳定性。结果表明:在溶剂水条件下制备的Zn O的光催化性能最好,且具有一定的稳定性。 相似文献
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掺钇α-Ni(OH)2的研究 总被引:5,自引:0,他引:5
采用均匀络合共沉淀法,首次合成出了掺杂钇基α-Ni(OH)2,并采用XRD,FTIR和SEM分析技术,对其结构及形貌进行了研究,电化学测试表明,所制得的掺杂钇基α-Ni(OH)2与掺铝的α-Ni(OH)2和球形β-Ni(OH)2相比,敲实密度1.6g/cm2,电化学比容量330mA.h/g以上,活性物质利用率大于95%,循环可逆性好等优点。 相似文献
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A flashing ratchet model of a two-headed molecular motor in a two-dimensional potential is proposed to simulate the hand-over-hand motion of kinesins. Extensive Langevin simulations of the model are performed. We discuss the dependences of motion and efficiency on the model parameters, including the external force and the temperature. A good qualitative agreement with the expected behavior is observed. 相似文献