Variations of plant life form diversity along the Northeast China Transect and its direct gradient analysis

Plant life form diversity and its direct gradient analysis on a larger scale climate change gradient were tested, based on the data from Northeast China Transect platform. The results showed that the species numbers, life form richness and life form diversity were relative higher at the eastern forests and the ecotone between typical vegetation, while those on the meadow grasslands and typical steppes were lower.Although plant life forms can reflect the climate variations, life form diversity is not consistent with the major global gradient along the NECT.     

膜与活性炭组合工艺处理天然水的研究进展

活性炭吸附作为膜分离技术处理天然水的预处理,可以有效去除水中膜本身难以去除的低分子溶解性有机物,减少三卤甲烷等物的生成,同时减轻膜的污染。阐述了活性炭和膜技术组合工艺处理天然水的研究进展。     

TiO2/ZnO光催化降解四环素的研究

以太阳光、汞灯为光源，TiO2/ZnO复合半导体为催化剂处理四环素溶液，探讨了催化剂的配比、溶液体积、光照时间、pH、初始浓度、光强等6种因素对光催化活性的影响，比较了汞灯和太阳光作光源时的光催化效果，结果表明，用太阳光作光源时光催化效果也较好。     

高炉炉体冷却水水质稳定处理

用复合水稳药剂对高炉炉体冷却水进行水质稳定处理,系统处理后结垢附着速度0.14.m·c·m,腐蚀速度0.033mm/a.本法应用于石家庄钢铁厂高炉净环水.     

用图解趋势分析法计算硫酸盐化速率

把大气看成连续变化的流体,采用均匀网格定点实测大气硫酸盐化速率资料,并把全市纳入一个平面直角坐标系,连贯这些点成三角形,求算这些点的趋势坐标及硫酸盐化速率,最后计算硫酸盐化速率全市均值。     

论建设项目环评的公众参与

依据《环境影响评价公众参与暂行办法》有关规定，结合多年从事环境影响评价的经验，就建设项目环评过程中开展公众参与的时机、采用的形式、公众参与内容的设计及反馈信息的处理等方面提出了建议，为环评工作的公众参与提供参考。     

废水中痕量硝基酚类的高效液相色谱分析

本文研究了废水中痕量硝基酚类的高效液相色谱分离、测定方法。在碱性条件下,硝基酚类的最大吸收波长移向360～420hm范围内,以λ=395nm作的检测波长进行测定,提高了分析方法的灵敏度和选择性。同时,研究了不同流动相、检温等因素对分离的影响,确定了最佳流动相组成。样品分析采取直接水溶液进样法简化了预处理步骤。检测下限达10~(-10)g/m1。     

超声波降解有机磷农药乐果的实验研究

报道了用超声波降解模拟废水中低浓度乐果的试验。探讨了超声波辐射时间、外加H2O2、溶液中乐果的初始浓度、溶液温度等因素对乐果降解效果的影响。试验表明，辐射时间延长，降解率增加，辐射120min后降解率达97．5％；加入浓度为1．27mg／ml的H2O2即可明显提高乐果的降解率，H2O2的添加量达2．44mg／ml后，降解率增加趋缓；乐果溶液初始浓度由0．08mg／ml增加到1．6mg／ml，降解率由87．5％降低到55％；溶液温度控制在30℃以下对超声降解有利。     

Approaches to municipal wastewater irrigation and environmental protection

To reuse the water and nutrient resources from ecological point of view the goals, criteria and constraint conditions of the scientifically municipal wastewater irrigation are discussed as well as the practice in major municipal wastewater irrigation areas in China is introduced, of which particularly the effects of municipal water irrigation mixing with oil refinery wastewater on the agricultural ecosystem are studied and described. It has been revealed that benzo(a)pyrene in various parts of paddy crop is attributed to air pollution, water-soil pollution and biosynthesis of plant. Of exogenous contributions of benzo(a)pyrene in paddy shoot system under natural condition, the dominant factor is the air pollution, whereas the water-soil factor is considered to be secondary. Therefore, it is mostly urgent to control the air pollution source of benzo(a)pyrene, to which the edible parts of various green plants are exposed directly.     

Two different proteases produced by a deep-sea psychrotrophic bacterial strain,<Emphasis Type="Italic"> Pseudoaltermonas</Emphasis> sp. SM9913

A psychrotrophic bacterial strain, Pseudoaltermonas sp. SM9913, was isolated from deep-sea sediment collected at 1,855 m depth. Two proteases produced by Pseudoaltermonas sp. SM9913 were purified, MPC-01 and MCP-02. MCP-01 is a serine protease with a molecular weight of 60.7 kDa. It is cold-adapted with an optimum temperature of 30–35°C. Its K_m and E_a for the hydrolysis of casein were 0.18% and 39.1 kJ mol^–1, respectively. It had low thermostability, and its activity was reduced by 73% after incubation at 40°C for 10 min. MCP-02 is a mesophilic metalloprotease with a molecular weight of 36 kDa. Its optimum temperature for the hydrolysis of casein was 50–55°C. The K_m and E_a of MCP-02 for the hydrolysis of casein were 0.36% and 59.3 kJ mol^–1, respectively. MCP-02 had high thermostability, and its activity was reduced by only 30.5% after incubation at 60°C for 10 min. At low temperatures, Pseudoaltermonas sp. SM9913 mainly produced the psychrophilic protease MCP-01.Communicated by O. Kinne, Oldendorf/Luhe