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1. Effects of PCE pollution on soil enzyme activities | |||
Tao Honglin,Shan Aiqin | |||
Environmental Science and Techology 09 April 2011 | |||
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Abstract:Simulated experiments were conducted to study the eco-toxicology effects of PCE pollutant on three main soil enzyme activities: protease, urease and catalase. The results showed that, increasing the initial PCE concentration resulted in higher inhibition effect on both protease and urease activities. The process was inhibited firstly and then recovered. PCE had a significant inhibition effect on soil protease and urease activites when its concentration ≥0.15, and ≥3.0mg/kg, respectively. The inhibition effect on soil protease and urease activites was indistinctive when PCE concentration <0.05, and <0.3mg/kg, respectively. On the first day, the inhibitory rates for protease activity were 28.31%~63.64%, and reached the maximum levels. The inhibition term of PCE on protease was about 9~15 days. It had a high significant inhibition effect (49.7%~71.09%) to urease activity on the first day when PCE concentration was above 0.15mg/kg. The inhibition term of PCE on urease was about 5~9 days. PCE had no obvious inhibition effect but a slight activation effect to catalase activity when its concentration was 0.05~30.0mg/kg. Within the experimental concentration range, microbes in contaminated soil had great resistance to peroxidation. Soil protease and urease were the most sensitive to PCE. The different effects of PCE on different enzymes would affect the properties and functions of the PCE contaminated soil. | |||
TO cite this article:Tao Honglin,Shan Aiqin. Effects of PCE pollution on soil enzyme activities[OL].[ 9 April 2011] http://en.paper.edu.cn/en_releasepaper/content/4421189 |
2. Effect of Cadmium-polluted Compost on Soil Microbial Biomass and Enzyme Activities | |||
Guiqiu Chen,Yun Chen,Guangming Zeng,Anwei Chen,Wenjuan Zhang | |||
Environmental Science and Techology 26 September 2010 | |||
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Abstract:The study was designed to assess changes of microbial biomass and enzyme activities between compost and cadmium-polluted compost applied to red soil. Results showed that soil microbial biomass C and P, activities of catalase, dehydrogenase, and acid phosphatase decrease in all treatments during the incubation time. Cd-polluted compost has an inhibitory effect on microbial biomass P and acid phosphatase activity than compost in control at the same sampling time. Microbial biomass C is activated by 0.26-98.46% in soils of <27.8 mg/kg Cd treatment than that of control. Catalase activity is stimulated by 0.17-4.49% in treatments with <12.8 mg/kg Cd. Dehydrogenase activity in treatment of 8.8 mg/kg Cd increases by 1.6-16.1% than that of control. Urease activity increases by 0.56-65.90% with an increase of Cd in compost with <17.8 mg/kg Cd. But in treatments with >27.8 mg/kg Cd, the urease activity is inhibited by 0.81-2.65% at Day 20. These results suggest that <27.8 mg/kg Cd-contaminated compost have activation impacts on soil microbial biomass C, urease, catalase, and dehydrogenase activity. | |||
TO cite this article:Guiqiu Chen,Yun Chen,Guangming Zeng, et al. Effect of Cadmium-polluted Compost on Soil Microbial Biomass and Enzyme Activities[OL].[26 September 2010] http://en.paper.edu.cn/en_releasepaper/content/4386731 |
3. Toxicity of Uranium and Lead to B.subtilis | |||
liuqing,Xu weichang,Zhao guodong,Zhao youcai | |||
Environmental Science and Techology 05 April 2007 | |||
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Abstract:B.subtilis has the broad foreground in dealing with the heavy metals waste water. It is necessary to study the toxicity of heavy metals to B.subtilis and get “the Maximum No-Effect Level ” and “the Lethal Concentration”.The toxicity of different concentration Uranium and Lead to B.subtilis in its growth was studied by three different methods in terms of measuring the diameter of the circle of bacteriostasis, counting the bacterial population by Heamacytometer and observing the change of the shape and the density of the bacteria through microscope. The experimental results have indicated that these two heavy metals had great inhibition effect to the growth of B.subtilis. The Maximum No-Effect Level of Uranium and Lead to B.subtilis are below 1mg/L and the Lethal Concentration of Uranium and Lead to B.subtilis are 500mg/L and 1000mg/L respectively. In these methods used for the toxicity of heavy metals to microorganism,counting the bacterial population are more sensitive. | |||
TO cite this article:liuqing,Xu weichang,Zhao guodong, et al. Toxicity of Uranium and Lead to B.subtilis[OL].[ 5 April 2007] http://en.paper.edu.cn/en_releasepaper/content/11986 |
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