Skeletal Microstructure of Galaxea fascicularis Exsert Septa: A High-Resolution SEM Study
Skeletal Microstructure of Galaxea fascicularis Exsert Septa: A High-Resolution SEM Study
复制标题
束状星系 Exsert Septa 的骨骼微结构：高分辨率 SEM 研究
DOI：
--
复制
发表时间：
2003
期刊：
影响因子：
--
通讯作者：
A. Marshall
中科院分区：
文献类型：
--
作者：
P. Clode;A. Marshall
四种晶体类型的沉积在几种颜色的变种的珊瑚Galaxea fascicularis隔膜的生长表面进行了研究超过24小时的时间。结果表明，纳米晶体，在致密物的顶端的突出隔膜，可能是表面表现的钙化中心。这些晶体也被发现在轴珊瑚福尔摩沙的轴珊瑚的隔膜上。纳米晶体的沉积似乎是独立的昼夜节律。内部和近端的中隔尖，不同的集群多晶纤维起源于钙化中心，形成扇形束。在这些纤维束上，针状晶体生长并延伸，在骨骼表面形成可见的纤维束。两种G. fascicularis和A.福尔摩沙的发生没有昼夜节律。梭形晶体的成核似乎与钙化中心无关，可能是通过二次成核发生的。梭形晶体形成的半固体物质表明，晶体可能在中隔延伸中发挥结构作用。片状晶体，这还没有被报道为一个组成部分的石珊瑚骨骼之前，拥有不同的层的多面体板，虽然这些层也没有出现与每日的增长增量。片晶与石珊瑚骨骼其他组成部分的关系及其参与骨骼生长的情况尚不清楚。
The deposition of four crystal types at the growth surface of the septa of several color morphs of the coral Galaxea fascicularis was investigated over a 24-h period. Results suggest that nanocrystals, on denticles at the apices of exsert septa, may be the surface manifestation of centers of calcification. These crystals were also found on the septa of the axial corallite of Acropora formosa. The deposition of nanocrystals appears to be independent of diurnal rhythms. Internally and proximal to the septal apices, distinct clusters of polycrystalline fibers originate from centers of calcification and form fanlike fascicles. Upon these fascicles, acicular crystals grow and extend to form the visible fasciculi at the skeletal surface. Deposition of aragonitic fusiform crystals in both G. fascicularis and A. formosa occurs without diurnal rhythm. Nucleation of fusiform crystals appears to be independent of centers of calcification and may occur by secondary nucleation. Formation of semi-solid masses by fusiform crystals suggests that the crystals may play a structural role in septal extension. Lamellar crystals, which have not been reported as a component of scleractinian coral skeletons before, possess distinct layers of polyhedral plates, although these layers also do not appear to be associated with daily growth increments. The relationship of lamellar crystals to other components of the scleractinian coral skeleton and their involvement in skeletal growth is unknown.