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arXiv 1105.0816cond-mat.softphysics.chem-ph
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紫膜单分子层中的电荷输运:一种顺序隧穿方法

Charge transport in purple membrane monolayers: A sequential tunneling approach

Eleonora Alfinito, Jean-Francois Millithaler, Lino Reggiani

摘要:

蛋白质中的电流电压(I-V)特性可能对由外部刺激(光子、气味等)诱导的构象变化敏感。这种灵敏度除了在生物材料的微观结构中提供新的光之外,还可以用于医学和工业应用。在这里,我们表明,在一个单一的蛋白质中相邻的氨基酸之间的载流子转移的顺序隧道模型可以是负责在很宽的范围内施加的电位测量的电性能的基本机制。我们还表明,蛋白质结构和电响应之间的这种严格的相关性可以导致新一代的纳米生物传感器,模仿生物物种的感觉活动。为了证明蛋白质电特性的潜在用途,我们提供了一个微观解释最近的I-V实验中进行的细菌视紫红质在纳米尺度的长度。

英文摘要:

Current voltage (I-V) characteristics in proteins can be sensitive to conformational change induced by an external stimulus (photon, odour, etc.). This sensitivity can be used in medical and industrial applications besides shedding new light in the microscopic structure of biological materials. Here, we show that a sequential tunneling model of carrier transfer between neighbouring amino-acids in a single protein can be the basic mechanism responsible of the electrical properties measured in a wide range of applied potentials. We also show that such a strict correlation between the protein structure and the electrical response can lead to a new generation of nanobiosensors that mimic the sensorial activity of living species. To demonstrate the potential usefulness of protein electrical properties, we provide a microscopic interpretation of recent I-V experiments carried out in bacteriorhodopsin at a nanoscale length.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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