竞争食物的主动布朗粒子的拟趋化性
Pseudo-chemotaxis of active Brownian particles competing for food
摘要：
利用布朗动力学模拟，研究了有燃料（或“食物”）源存在时活性布朗粒子（ABPs）的运动。这是一个既定的事实，在封闭的固定系统中，活性的ABPs产生的密度分布，增强在低活性的区域，这通常被称为“抗趋化性”。我们证明，-相反，共同认为-在非静止的设置，出现在这里作为一个结果，短的燃料爆发，我们的模型ABPs，而不是表现出趋化行为的签名。在与不活跃的，但在其他方面相同的布朗粒子（BP）的直接竞争中，ABPs被证明可以获取更大量的食物。从生物学的角度来看，尽管没有感觉装置，但激活的能力将包含进化优势。
英文摘要：
Using Brownian dynamics simulations, the motion of active Brownian particles (ABPs) in the presence of fuel (or 'food') sources is studied. It is an established fact that within confined stationary systems, the activity of ABPs generates density profiles that are enhanced in regions of low activity, which is generally referred to as 'anti-chemotaxis'. We demonstrate that -- contrary to common believes -- in non-stationary setups, emerging here as a result of short fuel bursts, our model ABPs do instead exhibit signatures of chemotactic behavior. In direct competition with inactive, but otherwise identical Brownian particles (BPs), the ABPs are shown to fetch a larger amount of food. From a biological perspective, the ability to turn active would, despite of the absence of sensoric devices, encompass an evolutionary advantage.
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