In recent years much attention has been paid to phosphatized spheroidal fossils found in the Sinian Doushantuoan phosphorites in Weng an, Guizhou Province.
我国贵州瓮安陡山沱期磷块岩中的磷酸盐化球状化石是近年来受到广泛关注的一类微体化石。
The phosphatized spheroidal fossils are a kind of microfossils, which are morphologically characterized by having a spherical appearance, either with spinal and tuberculate sculptures or with smooth outer surfaces, and were preservationally phosphatized during early diagenesis.
磷酸盐化球状化石是近 2 0年来才相继发现的一类微体化石 ,主要产于下寒武统梅树村阶和震旦系陡山沱组的含磷地层。
By observing microstructures , we find they may form spheroidal A,acicular A and feathery A .
组织观察发现,除形成球状A、针状A外,还形成羽毛状A。
A process for the preparation of different particles of CaC03 is intruducted, the effect of various factors on CaCO3 crystal is discussed and spherical and plate-like calcium carbonate with small partical size are obstained.
采用溶液法制备了不同晶形碳酸钙,讨论了各种因素对碳酸钙结晶的影响,并得到了粒径较小的球状和片状碳酸钙。
Ca(NO3)2·4H2O and (NH4)3PO4·3 H2O used as reagents and polyvinylpyrrolidone (PVP) as template, spherical hydroxyapatite (HA) with diameter of 30～50 nm was synthesized successfully.
3H2O为反应物,聚乙烯吡咯烷酮(PVP)为模板,成功地合成了直径为30~50nm的球状羟基磷灰石。
But the report about the synthesis of spherical nano and micro HA is few.
球状HA具有良好的离子交换性能，能吸附并回收利用地方饮用水中过量的氟离子和工业废水中的重金属离子，可以用作一种新型的环境功能矿物材料。
