nacre

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As a resul t, nacre thickness is sometimes just a cosmetic layer t hat can wear thin over time.
所以真珠质的厚度就像脸上化妆品，不久就会磨薄了。
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Not only then are they smaller, less robust creatur es, but the pollution in the water changes the color of the nacre and change the color of the pearl.
珍蚌不但更小，生命力更弱，受到污染的水会改变真珠质和珍珠的颜色。
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Only relatively pristine material has the goods Landman is after, so his team uses a scanning electron microscope (below), which utilizes a beam of electrons to image surfaces, to find the best nacre.
只有相对原始状态的材料才拥有兰德曼所需要的研究对象，因此他的研究小组必须使用利用电子束表面成像的扫描电子显微镜（下图）去寻找最好的珍珠层。

a smooth, hard substance forming a layer inside the shells of some sea creatures. It is white but also seems to shine with different colours, and is used to make buttons and for decoration.

珍珠层
To observe and analysis the effect of nacre composite artificial bone on biological behavior of human osteoblast in vitro.3.
2．阐明珍珠层与聚乳酸复合后形成的人工骨材料在体外培养环境中对成骨细胞生物学行为的影响。
化学
珍珠层
Nacre is one of the general construction units of mollusk shells, Thoroughly studying on it can provide insight not only into the pearl-culture, but also into fabrication of advanced organic-inorganic composite materials.
珍珠层是软体动物硬壳中普遍发育的一种结构单元，对其进行深入研究可为人工培育珍珠及制造现代有机-无机复合材料提供科学依据。
珍珠质
Secondly, we conducted an in vitro experiment to simulate the growth of aragonite on nacre surface via the vapor diffusion method in the absence of any other additional additives.
其次，本文采用传统的气相扩散方法，在没有任何添加剂的溶液中，进行了珍珠质基底上CaCO_3晶体的体外沉积实验。
机械工程
珍珠母
But for the stiffness of the nacre,the dominated factor is the layer-by-layer crossed and stacked form of the structural design mechanism,and it is in agreement with experimental results.
但是珍珠母内的交错层叠堆垛的结构设计机制才是决定它刚度的主导因素,这与试验结果相当吻合。
生物学
珍珠层
珍珠母
珍珠质
珠母贝
真珠质;珠母贝