Amorphous and crystalline calcium carbonate distribution in the tergite cuticle of moulting Porcellio scaber (Isopoda, Crustacea)
Amorphous and crystalline calcium carbonate distribution in the tergite cuticle of moulting Porcellio scaber (Isopoda, Crustacea)
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DOI：
10.1016/j.jsb.2011.03.019
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发表时间：
2011-07-01
影响因子：
3
通讯作者：
Ziegler, Andreas
中科院分区：
文献类型：
--
作者：
Neues, Frank;Hild, Sabine;Ziegler, Andreas
等足类角质层的主要矿物成分由结晶镁方解石和无定形碳酸钙组成。在蜕皮过程中，等足类动物首先蜕皮后半部分，然后蜕皮前半部分。在陆生物种中，碳酸钙会被再吸收、储存和回收，以便在蜕皮周期中保留大量的矿物质。我们使用同步辐射X射线粉末衍射，元素分析和拉曼光谱，以量化ACC/方解石的比例，矿物相分布和组合物的前，后tertereprazole角质层在8个不同阶段的蜕皮周期的Porcellio scaber。结果表明，大部分的无定形碳酸钙（ACC）被吸收角质层，而方解石留在老角质层和脱落在蜕皮过程中。在premouth吸收ACC从后角质层是伴随着增加内的前背板，和矿化的新的后角质层的矿物从前角质层的吸收。这表明在角质层矿化中使用ACC的一个原因是促进角质层碳酸钙的再吸收和再循环。此外，我们表明，ACC先于方解石的形成在远层的terterepresso角质层。(C)2011 Elsevier Inc. All rights reserved.
The main mineral components of the isopod cuticle consists of crystalline magnesium calcite and amorphous calcium carbonate. During moulting isopods moult first the posterior and then the anterior half of the body. In terrestrial species calcium carbonate is subject to resorption, storage and recycling in order to retain significant fractions of the mineral during the moulting cycle. We used synchrotron X-ray powder diffraction, elemental analysis and Raman spectroscopy to quantify the ACC/calcite ratio, the mineral phase distribution and the composition within the anterior and posterior tergite cuticle during eight different stages of the moulting cycle of Porcellio scaber. The results show that most of the amorphous calcium carbonate (ACC) is resorbed from the cuticle, whereas calcite remains in the old cuticle and is shed during moulting. During premoult resorption of ACC from the posterior cuticle is accompanied by an increase within the anterior tergites, and mineralization of the new posterior cuticle by resorption of mineral from the anterior cuticle. This suggests that one reason for using ACC in cuticle mineralization is to facilitate resorption and recycling of cuticular calcium carbonate. Furthermore we show that ACC precedes the formation of calcite in distal layers of the tergite cuticle. (C) 2011 Elsevier Inc. All rights reserved.