Immigrant Pantoea agglomerans embedded within indigenous microbial aggregates：A novel spatial distribution of epiphytic bacteria

Immigrant bacteria located on leaf surfaces are important to the health of plants as well as to people who consume fresh fruits and vegetables. However, the spatial distribution and organization of these immigrant bacteria on leaf surfaces are still poorly understood. To examine the spatial organization of these strains, two bacterial strains on tobacco leaves： （1） an indigenous strain, Pseudomonas stutzeri Nov. Y2011 labeled with green fluorescent protein, and （2） an immigrant strain Pantoea agglomerans labeled with cyan fluorescent protein isolated from pear, were studied. Under moist conditions, P. agglomerans cells quickly disappeared from direct observation by laser- scanning confocal microscopy, although elution results indicated that large amounts of live cells were still present on the leaves. Following exposure to desiccation stress, particles of cyan fluorescent protein-labeled P. agglomerans were visible within cracked aggregates of P. stutzeri Nov. Y2011. Detailed observation of sectioned aggregates showed that colonies of immigrant P. agglomerans were embedded within aggregates of P. stutzeri Nov. Y2011. Furthermore, carbon-resource partitioning studies suggested that these two species could coexist without significant nutritional competition. This is the first observation of an immigrant bacterium embedding within aggregates of indigenous bacteria on leaves to evade harsh conditions in the phyllosphere.     

结合激光雷达分析2014年春季南京地区一次大气污染过程

利用环境监测数据、气象数据以及数值模拟结果,结合激光雷达数据反演的气溶胶消光系数,分析了2014年5月26日至6月1日南京地区一次典型的大气污染过程.本次污染过程受到外源性沙尘和烟尘输入以及本地污染排放叠加影响.气象因素对污染物的生消起到了重要作用,低压、逆温等因素阻碍污染物扩散,最终强降雨的出现使本次污染过程终结.整个污染过程中大气边界层高度偏低且变化不大,大气形势稳定,污染物扩散困难.激光雷达可以有效探测气溶胶的垂直分层结构,能直观准确地反映出污染物的分布聚集情况以及时空变化,对大气污染监测具有重要意义.     

以pH和ORP作为脉冲SBR工艺的实时控制参数

为了实现脉冲SBR深度脱氮的实时控制,以某污水处理厂市政污水为处理对象,考察了脉冲SBR在深度脱氮过程中pH及ORP的变化规律.试验结果表明,pH及ORP的变化规律与脉冲SBR有机物去除、硝化与反硝化过程存在较好的相关关系.可以根据pH和ORP变化曲线上的特征点对脉冲SBR进行实时控制.并考察了污水C/N(COD/NH4 -N)对pH及ORP的变化规律的影响.在硝化过程中,C/N对pH及ORP曲线变化点的出现没有影响;在反硝化过程中,应结合pH值"硝酸盐峰"和ORP"硝酸盐膝"来判断低C/N污水反硝化的终点.在该试验中,出水TN低于2 mg/L,TN去除率可达到96%以上.     

川东平行岭谷区自然景观垂直分异规律及综合分区--以重庆北碚区为例

以重庆市北碚区为代表,论述了川东平行岭谷区自然景观的垂直分异特征,并在此基础上对该区域进行了综合分区,再结合各分区内土地的自然特征采取不同的措施,从而做到因地制宜地发展各项生产.     

Phytoremediation in subtropical Hawaii—A review of over 100 plant species

Phytoremediation is an emerging remediation technology that utilizes plants and microbes to clean up contaminated air, soil, and water. Tropical and subtropical environments have an advantage in that long plant‐growing seasons and increased soil temperature can accelerate phytoremediation processes. Various contaminated sites in Hawaii have been addressed using this technology. In this article, work progress and advances of phytoremediation are briefly reviewed and exemplified with seven chemically contaminated sites in Hawaii. The investigations were performed for one or more of the following remediation needs: explosive residues, hydrocarbons, pesticide residues, soil stabilization, and slaughterhouse wastewater. In this unique article, studies of testing of over 100 plant species for remediation are reviewed and documented. The general trend leads one to consider that salt‐ and/or drought‐tolerant plants can bear other potential stress‐inducing conditions. © 2004 Wiley Periodicals, Inc.     

开展我国的热安全工程技术研究

近些年来，我国热灾害事故屡屡发生，损失巨大，受到社会的普遍关注。当今，热灾害事故的防治，是一门集基础研究、应用研究和高新技术开发为一体的综合工程研究体系。社会需求、基础研究的支持和高新技术的配合，使得开展这项研究的条件与时机己经成熟。现简略介绍热安全工程技术研究体系的结构，以及这项研究的国内外状况。     

煤矿安全系统的计算机统计控制方法

煤矿安全系统在稳定状态，安全监测设备的数据符合正态分布。无事故发生时，控制图表示监测数据样本均值和极差的数据应以９９．７％的概率落在控制区内。运用统计学理论和方法分析、控制均值和极差点的位置及点间关系，可以达到预测和控制安全系统事故的发生和发展的目的。     

试论环境监测数据审核机制的建立及运作

环境监测数据审核是环境监测质量管理的重要一环。在对环境监测数据审核重要性的认识，及其内容，依据分析解释的基础上建立了环境监测数据审核运行机制。并提出了几点措施，确保环境监测数据在获取过程中得到了有效监控，把监测数据差错率消除在监测过程的各个环节。     

四川盆地卤水的氢、氧同位素地球化学特征及其成因分类研究

四川盆地地下卤水分布广泛，类型繁多，依据氢、氧同位素地质学方法及其分布规律性，将盆地卤水明确划分出大气水淋滤型、海相沉积型、海相沉积-大气降水叠加型和海相沉积-岩浆水叠加型等四种成因类型。该分类明确，标志明显，有确定的成因涵义，取得了较好的效果。     

石化企业燃煤电厂二氧化硫控制对策研究

通过对国内外燃煤电厂二氧化硫控制现状、政策及技术的对比分析，提出了石化企业燃煤电厂二氧化硫控制的战略性对策。