在细胞壁上构筑自组装的生物矿化结构  

Self-assembled Biomineralized Structures Constructed in Plant Cell Walls

作　　者：王荔军[1] 王运华[2] 张福锁[1] 杨文胜[3] 李铁津 

机构地区：[1]中国农业大学植物营养系,北京100094 [2]华中农业大学资源环境和农业化学系,武汉430070 [3]吉林大学化学系,长春130023

出　　处：《化学学报》2002年第6期1144-1146,共3页Acta Chimica Sinica

基　　金：国家重点基础研究专项经费 (No .G19990 1170 0 );国家自然科学基金 (Nos .30 170 6 0 3;30 170 5 5 0 )资助项目

摘　　要：芦荟植物在其叶刺细胞壁上利用CaCl2 前体分子合成了非自然状态下形成的生物钙化结构 .合成的生物CaCO3 结构为四棱柱形 ,直径为 2～ 3μm ,长 40～ 6 0 μm .实验发现在场发射电镜持续电子束作用下和冷冻切片断裂作用下均可诱导一系列人工弯曲和断裂 .如此特殊的柔性和刚性与非生物的地球化学条件下形成的矿物完全不同 。Aloe plant makes 'non-natural' biomineralized structure formed from inorganic precursor species, CaCl2 in cell walls of leaf spicules by culture techniques. The quadri-prisms of CaCO3 biominerals were formed in aloe leaf spicules when CaCl2 was supplied. Quadri-prisms typically ranged in length from 40 mum to 60 mum and were ca. 2 similar to 3 mum in width. Prolonged exposure to electron beam in field-emission SEM and fractured using a cooled razor blade can induce a series of artifactual curvatures and cracks on the structure surfaces. Such unique flexibility and rigidity features that typically distinguish biominerals from their counterparts that precipitate abiotically. Supramolecular recognition interactions between organic precursor molecules and the cell wall matrix may provide greater opportunities for structural control by the underlying molecular substrates of cell walls.

关 键 词：细胞壁 自组装 生物矿化 CACO3 芦荟 化学合成 碳酸钙 分子识别 仿生材料 

分 类 号：Q67[生物学—生物物理学]