Multilevel Modular Organization of Corallium elatius
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摘要: 以重要的宝石级红珊瑚品种Corallium elatius为研究对象,采用偏光显微镜、扫描电子显微镜、透射电子显微镜等测试手段,逐级还原了Corallium elatius样品从宏观到纳米的多级结构构建:有缺陷但具有一定定向性的纳米筹组成了亚微米单元;亚微米单元按一定方向排列形成了骨针单元;骨针单元的组合形成了片状单元;定向性近乎一致的片状单元沿界线(有机质)排列成了明暗相间的人字纹单元;人字纹单元以髓部为中心依次排列形成了Corallium elatius样品横截面的放射状纹理。每一级结构由更小尺度的结构单元组成,同时,多个同尺度单元又排列形成上一级结构。在这种多级嵌套结构中,每一级的结构单元具有几乎一致的定向性。随着结构单元尺度的细化,结构单元的定向程度降低。从生物矿物学角度探讨了不同尺度方解石模块的自组装模式,揭示了样品在有机质调控下的特殊结构,为后续的研究提供了方向。
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关键词:
- Corallium elatius /
- 扫描电子显微镜 /
- 透射电子显微镜 /
- 纳米筹
Abstract: Biominerals present complex structures as a result of aggregation of crystalline "building blocks".In Corallium elatius skeleton,the authors observe that different levels of "building blocks" are arranged in several hierarchies of directional modules.Imperfect directional nanograins form into fibers;the fibers become spicule in a spiral order;then the spicule units turn into strips;the strips join side by side to make up herringbone units;and finally exhibit the radiating structure of the samples.The modules in each hierachical level assemble into larger units which comprise the next higher level of the hierarchy containing smaller and oriented modules.This modularity shows plenty implications for the origin of complex biomineral shapes in nature.-
Keywords:
- Corallium elatius /
- SEM /
- TEM /
- nanodomains
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