订购红鲍鱼珍珠层
Ordering in red abalone nacre
摘要：
红鲍珍珠层是一种研究非常深入的生物矿物，但其形成机制仍然知之甚少。在这里，我们报告的定量测量探测程度的文石片珍珠层，并显示，为了发展超过约50微米的距离。这些观察结果表明，珍珠层中的文石片的取向顺序是逐步和动态建立的，我们表明，控制组装模型的基础上抑制沿特定方向的晶体生长速率，当生长被限制在一个层状结构，产生一个片剂模式与详细的实验测量所揭示的一致。这项工作提供了强有力的证据表明，有机体对珍珠层中晶体取向的控制是通过调节晶体成核和生长来实现的，而不是通过有机基质片上的有机分子的直接模板或异质外延生长来实现的。
英文摘要：
Red abalone nacre is an intensely studied biomineral, and yet its formation mechanism remains poorly understood. Here we report quantitative measurements probing the degree of order of the aragonite tablets in nacre, and show that order develops over a distance of about 50 microns. These observations indicate that the orientational order of aragonite tablets in nacre is established gradually and dynamically, and we show that a model of controlled assembly based on suppression of the crystal growth rate along a specific direction, when growth is confined in a layered structure, yields a tablet pattern consistent with those revealed by detailed experimental measurements. This work provides strong evidence that the organism s control of crystal orientation in nacre occurs via regulation of crystal nucleation and growth as opposed to direct templation or heteroepitaxial growth on organic molecules on the organic matrix sheets.
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