物理Chirality它以负熵为食
Physical Chirality. It Feeds on Negative Entropy
摘要：
许多科学家认为手性主要是一个几何概念。还有一个物理方面的手性，这在很大程度上被忽视。这里介绍两个代表"物理手性“的机械装置的例子。这是一个旋转喷水器和克鲁克斯辐射计的变体。当与适当的媒体互动时，他们都只选择两种可能的旋转模式中的一种。这样的行为不遵守时间反演不变性，这被认为是一个规则，在经典力学。这是由于它们的手性性质。相反，它们确实遵守时空（ST）不变性定律，也就是说，在相反方向旋转的是给定设备的镜像。在Koumura等人最近的一项实验中，他们发现了分子转子的类似行为。强调了物理手性可能的生物学意义，并得出结论：手性分子系统不易达到热平衡。换句话说：“物理手性确实依赖于负熵”，因此，它很可能对生命具有至关重要的价值。
英文摘要：
Chirality is considered by many scientists to be mainly a geometric concept. There exists also a physical aspect of chirality which is largely being overlooked at. Two examples of mechanical devices are introduced here that represent ``Physical Chirality''. These are a rotating water sprinkler and a variant of Crookes' radiometer. When interacting with appropriate media, they both choose only one mode of rotation out of two possible ones. Such a behavior does not obey time-reversal invariance, which is regarded to be a rule in classical mechanics. This is due to their chiral nature. Instead, they do obey a space-time (ST) law of invariance, that is, what is rotating in the opposite direction is the mirror-image of the given device. In a recent experiment of Koumura et al. they discovered a similar behavior of a molecular rotor. The possible biological significance of physical chirality is emphasized hereby, and the conclusion is that chiral molecular systems do not reach readily thermal equilibrium. In other words: ``Physical chirality does feed on negative entropy'', and therefore, it may well be of crucial value to life.
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