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永保锋利的海胆牙齿


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海胆牙齿永葆锋利的奥秘一直为科学家所着迷。早在公元前343年,古希腊自然学家和哲学家亚里士多德就曾写过有关海胆的书籍。美国科学家终于将谜底揭开。他们发现,海胆牙齿中坚硬晶体间较软的有机物质是牙齿“自我打磨”并永葆锋利的关键。这种工作机理或许有助研制具有自我打磨功能的刀具。在这些晶体之间有一个很脆弱的有机层,当这个有机层变迟钝之后就非常容易折断,这时这个有机层底下那些尖锐的方解石晶体断面就会露出来,因此这些牙齿能够长时间保持锋利。...

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