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首页> 外文期刊>Crystal growth & design >New Crystallographic Relationships in Biogenic Aragonite: The Crossed-Lamellar Microstructures of Mollusks
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New Crystallographic Relationships in Biogenic Aragonite: The Crossed-Lamellar Microstructures of Mollusks

机译：生物文石中的新晶体学关系：软体动物的交叉层状微结构

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摘要

Crossed-lamellar microstructures are the most common shell-forming biomaterials in mollusks. Because of their complex hierarchical 3D arrangement and small crystallite size, previous crystallographic studies are scarce and have centered on particular species with no comprehensive analysis available. To evaluate the crystallographic diversity of the crossed-lamellar microstructures, we have studied a large set of bivalve and gastropod species with crossed-lamellar layers using X-ray diffraction and electron backscatter diffraction. From the number, distribution, and relationships of maxima, we have classified pole figures into nine different recurring crystallographic patterns. According to their crystallographic equivalences, these patterns can be grouped into five groups. A first division is established according to whether there is one or two main orientations for the c-axis of aragonite. In the latter case, each orientation corresponds to one of the two sets of alternating first-order lamellae. The two main orientations of the c-axis diverge by rotation within the plane of the first-order lamellae around either a common a- or b-axis. We also show how some patterns may derive from others. Patterns with two c-axis orientations represent crystal relationships until now completely unknown in biogenic and abiogenic aragonite and are most likely produced by particular proteomic pools.
机译：交错的层状微结构是软体动物中最常见的壳形成生物材料。由于其复杂的分层3D排列和较小的微晶尺寸，以前的晶体学研究很少，并且集中在特定种类上，没有全面的分析可用。为了评估交叉层微结构的晶体学多样性，我们使用X射线衍射和电子反向散射衍射研究了大量具有交叉层层的双壳类和腹足类动物。根据最大值的数量，分布和关系，我们将极图划分为9个不同的重复晶体学图案。根据它们的晶体学等效性，这些图案可分为五组。根据文石的c轴是否存在一个或两个主要方向来建立第一分区。在后一种情况下，每个方向对应于两组交替的一阶薄片中的一个。通过围绕共同的a轴或b轴在一阶薄片平面内旋转，c轴的两个主要方向发散。我们还展示了某些模式可能是从其他模式衍生而来的。具有两个c轴方向的模式代表着晶体关系，直到现在在生物和非生物文石中还是完全未知的，并且很可能是由特定的蛋白质组库产生的。

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