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首页> 外文期刊>Protoplasma: An International Journal of Cell Biology >Calcium associated with a fibrillar organic matrix in the scleractinian coral Galaxea fascicularis
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Calcium associated with a fibrillar organic matrix in the scleractinian coral Galaxea fascicularis

机译：钙与巩膜珊瑚Galaxea fascicularis中的纤维状有机基质有关

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Field emission scanning electron microscopy of frozen-hydrated preparations of the scleractinian coral Galaxea fascicularis revealed organic fibrils which have a diameter of 26 nm and are located between calicoblastic ectodermal cells and the underlying CaCO3 skeleton. Small (37 nm in diameter) nodular structures observed upon this fibrillar organic material possibly correspond to localised Ca-rich regions detected throughout the calcifying interfacial region of freeze-substituted preparations by X-ray microanalysis. We propose that these Ca-rich regions associated with the organic material are nascent crystals of CaCO3. Significant amounts of S were also detected throughout the calcifying interfacial region, further verifying the likely presence of organic material. However, the bulk of this S is unlikely to be derived from mucocytes within the calicoblastic ectoderm. It is suggested that in the scleractinian coral G. fascicularis, nodular crystals of CaCO3 establish upon a fibrillar, S-containing, organic matrix within small but distinct extracellular pockets formed between calicoblastic ectodermal cells and skeleton. This arrangement conforms with the criteria necessary for biomineralisation and with the long-held theory that organic matrices may act as templates for crystal formation and growth in biological mineralising systems. [References: 48]
机译：巩膜珊瑚Galaxea fascicularis的冷冻水合制剂的场发射扫描电子显微镜显示出直径为26 nm的有机纤维，位于成纤维细胞外胚层细胞和下面的CaCO3骨架之间。在这种原纤维状有机材料上观察到的小直径（直径为37 nm）结节状结构可能对应于通过X射线微分析在整个冷冻替代制剂的钙化界面区域中检测到的局部富含Ca的区域。我们建议与有机材料相关的这些富含钙的区域是新生的CaCO3晶体。在整个钙化界面区域还检测到大量的S，进一步证实了有机物质的可能存在。但是，大部分这种S不太可能来自成釉细胞外胚层中的粘液细胞。建议在巩膜珊瑚G. fascicularis中，CaCO3的结节状晶体建立在成纤维细胞，外胚层细胞与骨骼之间形成的小而独特的细胞外口袋中的原纤维，含S的有机基质上。这种安排符合生物矿化所需的标准，并符合长期存在的理论，即有机基质可以充当生物矿化系统中晶体形成和生长的模板。 [参考：48]

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