骨和牙齿的矿化     

赵秀琴  陈敏 《安徽科技学院学报》2011,25(4):37-41

脊椎动物通过进化选择了磷酸钙类磷灰石矿物来构建其牙齿和骨骼。本文描述了磷灰石在生物矿化过程中的关键特征,揭示了生物如何调制磷灰石的结构来控制矿物的组成和功能。通过以应用目的而进行的磷酸钙的合成与性能测试进行的研究,加深人们对磷灰石的化学和物理性质与其生长条件的敏感性有了更深刻的理解。  相似文献   

A Bacillus subtilis cell fraction (BCF) inducing calcium carbonate precipitation: Biotechnological perspectives for monumental stone reinforcement     

《Journal of Cultural Heritage》2014,15(4):345-351

Monumental stone decay is a consequence of the weathering action of physical, chemical and biological factors, which induce a progressive increase in porosity. To cope this degradation, bacterial calcium carbonate mineralization has been proposed as a tool for the conservation of monumental calcareous stones. The advantage of this kind of treatment is to obtain a mineral product similar to the stone substrate, mimicking the natural process responsible for stone formation. In this work, the possibility to induce CaCO₃ mineralization by a bacteria-mediated system in absence of viable cells was investigated and tested on stone. Our results showed that Bacillus subtilis dead cells as wells as its bacterial cell wall fraction (BCF) can act as calcite crystallization nuclei in solution. BCF consolidating capability was further tested in laboratory on slab stones, and in situ on the Angera Church, a valuable 6th century monumental site. New crystals formation was observed inside pores and significant decrease in water absorption (up to 16.7%) in BCF treated samples. A little cohesion increase was observed in the treated area of the Angera Church, showing the potential of this application, even though further improvements are needed.  相似文献