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为了确定石油降解菌对石油污染物的生物降解特性,选用分离得到的一株石油降解菌假单胞菌SY5,对其降解石油污染物的动力学特性进行了研究.研究结果表明,在30℃,pH=7.2的反应条件下,所筛选的SY5菌对石油具有良好的降解能力,降解石油的反应基本符合一级反应动力学,且随石油初始浓度的增大,SY5降解石油的速率减小,降解受到抑制.在生物降解的过程中,SY5的生长曲线具有明显增长和衰减曲线.在生长阶段,产率系数Y值为0.3873.在内源呼吸阶段,衰减系数bd值为0.1805d^-1,SY5菌自身氧化速度比较快.SY5生物降解石油Monod方程的最大比增长速率胁,和半饱和常数Ks分别为1.6d^-1和150mg/L. 相似文献
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Au nanoparticles coated on the surface of glass (Sample A) or on anodic aluminum oxide template surface (Sample B) were prepared using titanium dioxide sol-gel doped with chloroauric acid and with a reduction process. FE-SEM, UV-Vis spectrum and Fluorescence spectrum tests show that Au nanoparticles have been distributed randomly on the surface of glass, while deposition occurs on the surface of regular hollows for anodic aluminum oxide template. A sharp absorption peak appears at the wavelength of 536 nm for sample B, while there is a red shift, with a broader peak for sample A. A distinct fluorescence emission at the wavelength of 633 nm is detected for sample A, but no noticeable fluorescence emission has been found for Sample B. The results indicate that the microstructure and optical properties of Au nanoparticles can be modulated by different substrate. 相似文献