Department of Applied Chemistry, Faculty of Science and Technology, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama, 223-8522, Japan.
Department of Earth Science, Graduate School of Science, Tohoku University, 6-3, Aoba, Aramaki, Aoba-ku, Sendai, 980-8578, Japan.
Sci Rep. 2022 Feb 18;12(1):2848. doi: 10.1038/s41598-022-06974-2.
We clarified the specific micrometric arrangement and nanometric structure of the radiolarian crystalline spines that are not a simple single crystal. A body of the celestite (SrSO) skeleton of acantharian Acanthometra cf. multispina (Acanthometridae) composed of 20 radial spines having four blades was characterized using microfocus X-ray computed tomography. The regular arrangement of three types of spines was clarified with the connection of the blades around the root of each spine. The surface of the spines was covered with a chitin-based organic membrane to prevent from dissolution in seawater. In the nanometric scale, the mesocrystalline structure that consists of nanoscale grains having distorted single-crystal nature was revealed using scanning- and transmission electron microscopies, electron diffraction, and Raman spectroscopy. The acantharian skeletons have a crystallographically controlled architecture that is covered with a protective organic membrane. These facts are important for penetrating the nature of biogenic minerals.
我们阐明了放射虫晶刺的具体微观排列和纳米结构，这些晶刺不是简单的单晶。使用微焦点 X 射线计算机断层扫描技术，对由 20 根具有四个叶片的放射状刺组成的棘皮动物多刺星虫（棘皮星虫科）的天青石（SrSO）骨骼体进行了特征描述。通过每根刺根部周围叶片的连接，阐明了三种类型刺的规则排列。刺的表面覆盖有基于几丁质的有机膜，以防止在海水中溶解。在纳米尺度上，使用扫描和透射电子显微镜、电子衍射和拉曼光谱揭示了由具有扭曲单晶性质的纳米级晶粒组成的准晶结构。棘皮动物骨骼具有结晶控制的结构，表面覆盖有保护性有机膜。这些事实对于揭示生物成因矿物的性质非常重要。
