Chemotaxis of nonbiological colloidal rods
Chemotaxis of nonbiological colloidal rods
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DOI：
10.1103/physrevlett.99.178103
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发表时间：
2007-10-26
影响因子：
8.6
通讯作者：
Velegol, Darrell
中科院分区：
文献类型：
--
作者：
Hong, Yiying;Blackman, Nicole M. K.;Velegol, Darrell
趋化性是生物体通过有偏随机游走过程朝向或远离化学引诱剂或毒素的运动。在这里，我们描述了第一个实验的例子外的生物系统的趋化性。2.0 μ m长的铂-金棒通过“主动扩散”表现出向更高过氧化氢浓度的定向运动。布朗动力学模拟表明，没有通常归因于细菌的“时间感知”算法是必要的;相反，观察到的趋化性可以用主动扩散系数梯度中的随机游走物理来解释。
Chemotaxis is the movement of organisms toward or away from a chemical attractant or toxin by a biased random walk process. Here we describe the first experimental example of chemotaxis outside biological systems. Platinum-gold rods 2.0 mu m long exhibit directed movement toward higher hydrogen peroxide concentrations through "active diffusion.'' Brownian dynamics simulations reveal that no "temporal sensing'' algorithm, commonly attributed to bacteria, is necessary; rather, the observed chemotaxis can be explained by random walk physics in a gradient of the active diffusion coefficient.