中文摘要：

利用实验室分离而来的一株假单胞菌（PseudomonasalcaliphilaMBR），以亚硒酸钠为硒源，通过菌体的还原反应来获得红色硒纳米颗粒．将纯化出的硒颗粒为样品，使用一些材料表征技术表征其结构．扫描电镜观察其主要为球形颗粒且直径随着反应时间延长而变大，并最终形成花型硒材料；X射线能谱分析花型材料的构成基本为硒元素．

英文摘要：

Owning to the disadvantages of the physical and chemistry methods to synthesize nano-materi- al such as using the toxic reagents and consuming more energy, biological synthesis nanomaterial is at- tracted more attention. The bacteria, Pseudomonas alcaliphila MBR, isolated from the bioreactor in our laboratory, could synthesize Se nanoparticles in presence of the selenite solution. The Se nanoparti- cles purified from the reaction solution as the sample were examined to determine its structural charac- teristics. According to the images of scanning electrical microscope （SEM）, it was found that the diame- ter of the spherical Se nanoparticles increased with the extension of the reaction time. Over time flower Se material was formed. According to Energy-dispersive X-ray spectroscopy （EDS） analysis, it was found that the flower type materal was wholly composed of Se element.