The energetics and scaling of search strategies in bacteria
The energetics and scaling of search strategies in bacteria
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DOI：
10.1086/343874
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发表时间：
2002-12-01
影响因子：
2.9
通讯作者：
Mitchell, JG
中科院分区：
文献类型：
--
作者：
Mitchell, JG
身体大小对运动能量消耗的影响在动物中得到了很好的研究，但很少在细菌中进行研究。在这里，我计算了不同大小的细菌的四种趋化策略的成本，通过增加它们的运动和重新定位的成本。0.1微米的大小差异导致趋化性能量成本的100，000倍变化。任何给定大小的精确成本是鞭毛长度、检测和响应信号所需的最小速度以及信号梯度的非线性函数。这些参数是相互关联的，身体大小和战略紧密耦合到特定的环境梯度，提供解释和探索多样性和竞争的途径。这里的分析有着超越细菌的意义。幂律回归通过运输的最小成本为不同种类的趋化性具有相同的斜率，游泳动物，这表明一个普遍的异速生长方程的所有游泳生物。
The influence of body size on the energetic cost of movement is well studied in animals but has been rarely investigated in bacteria. Here, I calculate the cost of four chemotactic strategies for different-sized bacteria by adding the costs of their locomotion and reorientation. Size differences of 0.1 mum result in 100,000-fold changes in the energetic cost of chemotaxis. The exact cost for any given size is a nonlinear function of flagella length, the minimum speed necessary to detect and respond to a signal, and the gradient of the signal. These parameters are interlinked in such a way that body size and strategy are tightly coupled to particular environmental gradients, offering avenues for explaining and exploring diversity and competition. The analysis here has implications beyond bacteria. Power-law regression through the minimum costs of transport for different kinds of chemotaxis has the same slope as that for swimming animals, suggesting a universal allometric equation for all swimming organisms.