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Get a grip

机译：控制

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Someone once told me that they had spread grease all over the drainpipe that crawled up the front of their house, to prevent cats from climbing up it. It's a very simple and pretty harmless way of keeping the enemy away. It's hardly surprising, then, that Nature thought up just the same trick millions of years ago. Many higher plants' stems - and also sometimes their leaves - are covered with a whitish surface, which is slightly greasy to the touch. Botanists have known for a long time that wax in plants has many roles and that the powdery blooms on stems seem to be involved in keeping harmful insects away. The question is: how? But perhaps even just as important a question is: what makes the wax? Because if scientists are able to be on a more intimate level with what produces it, then they will be able to think up insect repellents that are more in keeping with Nature's ways. Not so long ago, researchers discovered an enzyme which synthesises lupeol, the wax component which forms the greater part of the powdery bloom.
机译：曾经有人告诉我，他们已经在爬到房屋前部的排水管上撒满了油脂，以防止猫爬上去。这是使敌人远离的非常简单且无害的方法。因此，自然界在数百万年前就想到了同样的技巧也就不足为奇了。许多高等植物的茎-有时还有它们的叶子-都覆盖着发白的表面，摸起来有点油腻。植物学家很久以来就知道植物蜡起着许多作用，茎上的粉状花开似乎与阻止有害昆虫有关。问题是：如何？但也许同样重要的一个问题是：蜡是由什么制成的？因为如果科学家能够更密切地了解其产生的原因，那么他们将能够思考出更符合自然界方式的驱虫剂。不久前，研究人员发现了一种酶，该酶可以合成羽扇豆酚，后者是蜡状成分的一部分，占粉状花朵的大部分。

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