The bacterial flagellum is beneficial in most cases but it can become a burden when the energy source is low because it is very costly to assemble and energize for motility. Recent electron cryo-tomography and real-time fluorescence microscopy studies suggest that bacteria can remove their flagella under starvation in a programmed way.

中文翻译：

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饥饿下的细菌鞭毛损失。

细菌鞭毛在大多数情况下是有益的，但是当能量来源低时，它可能成为负担，因为组装和激发运动的成本很高。最近的电子冷冻断层扫描和实时荧光显微镜研究表明，细菌可以在饥饿状态下以程序方式去除鞭毛。