Starvation and penetration of bacteria in soils and rocks

Summary The soil and subsurface strata are low nutrient environments and their bacterial inhabitants must adopt starvation responses to survive. These responses include the formation of dormant, viable cells which, although reduced in cell size and volume, are able to respond to any improvement in nutrient availability. Starved bacteria are able to survive for extended periods without nutrients and their reduced size allows them to disperse deeply within rocks and soils greatly improving their penetration. These combined factors may increase opportunities for bacteria to reach a deep waste disposal site.     

嗜热菌好氧生化处理废水的实验研究

本文通过嗜温范围到嗜热范围的连续动态试验,分析比较不同温度时的运行参数和反应动力学参数.得出好氧嗜热菌的活性或比去除速率是嗜温菌的6～7倍.而产生的污泥量却较少的结论.这种方法有很大的工业应用潜力,存在的主要问题是污泥沉淀性能很差.     

细菌对难浸硫化金矿的氧化研究（Ⅰ）

镇源金矿为大型的难浸金矿，主要载金矿物为黄铁矿。本文研究了矿浆浓度、培养基、接种量、ｐＨ值等因素对氧化的影响。结果表明，采用Ｔ．ｆ９６菌株在单项优化条件下，氧化６ｄ，脱硫率超过５１％，氧化１０ｄ，脱硫率可达６８．１０％。     

Heavy metal accumulation by bacteria and other microorganisms

Summary Bacteria, and other microorganisms, exhibit a number of metabolism-dependent and-independent processes or the uptake and accumulation of heavy metals and radionuclides. The removal of such harmful substances from effluents and waste waters by microbe-based technologies may provide an alternative or additional means of metal/radionuclide recovery for economic reasons and/or environmental protection. Both living and dead cells as well as products derived from or produced by microorganisms can be effective metal accumulators and there is evidence that some biomass-based clean-up processes are economically viable. However, many aspects of metal-microbe interactions remain unexploited in biotechnology and further development and application is necessary, particularly to the problem of radionuclide release into the environment.     

食醋对15种病原菌最低抑菌浓度测定

采用微量稀释法，检测食醋对１５种常见病原菌的最低抑菌家度。结果表明：浓度为１：２０食醋（ＰＨ＝４．４２）对金黄色葡萄球菌、白色念珠菌有抑制作用；浓度为１：４０食醋（ＰＨ＝４．８１）对大肠大杆菌、蜡样芽胞杆菌、粪肠球菌、阴沟肠杆菌有抑制作用；浓度为１：８０食醋（ＰＨ＝５．３８）对伤寒沙门氏菌等８种细菌有抑制作用。食醋对１５种病原菌的最低抑菌浓度为１：２０－１：８０，即ＰＨ值为４．４２－５．３８。     

海南琼海温泉嗜热菌研究

从海南琼海官塘温泉（70℃～90℃）分离到八株菌,均为革兰氏阳性菌,具芽孢,最高生长温度为90℃。经过生理生化鉴定,初步证实是具有嗜热脂肪芽孢杆菌（Bacillusstearothermphilus）特征的菌株。     

醋酸菌液态发酵产酸的研究

通过正交试验探讨了醋酸菌液态发酵产酸的最佳配方及工艺。     

用药的误区及其理论分析

使用药物是我们日常生活的一个重要部分。但是，人们对药物的使用普遍存在着误区，这些误区导致临床上产生许多药源性的疾病和不可逆的脏器损害。此文章通过对这些误区的分析，给人们正确、合理使用药物提供科学的理论依据。     

中华绒螯蟹Eriocheir sinensis幼体丝状细菌的扫描电镜观察

应用扫描电间对中华绒螯蟹幼体附着的丝状细菌进行了详细的观察，结果表明，丝状细菌只附生于幼体表面，没有明显伸入体内的结构，丝状细菌行裂殖生殖，生长繁殖所需营养直接摄取自水环境，并对其危害性以及防治等方面进行了探讨。     

红假单胞菌的分离及菌种保存试验研究

从不同来源的样品中分离出四株光合细菌 ,经鉴定均属于红假单胞菌 ,同时分别采用液体种自然条件下、液体种蜡封、穿刺物蜡封、砂土管等方法对其菌种进行了保存试验研究 ,最后得出两种最佳保存方法 :蜡封液体试管种法和试管穿刺蜡封法