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1. Effects of the Extracts of Phragmites australis on the Growth of Alternanthera philoxeroides | |||
ZHANG Zhen | |||
Environmental Science and Techology 13 May 2016 | |||
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Abstract:In this paper, we investigated the effects of ethanol extracts of Phragmites australis on the growth of Alternanthera philoxeroides, which would be helpful to control A. philoxeroides. The results showed that: 1) The ethanol extract of P. australis had allelopathic inhibition on A. philoxeroides (Synthetical response index of allelopathy<0), with that from stem of P. Australs showing strongest allelopathic effect on A. philoxeroides. 2) The ethanol extract of P. Australs decreased the bud number of ramets, root-top ratio and chlorophyll content, but increased the node number, plant height, leaf area, succulent degree and relative electric conductivity of A. philoxeroides. 3) The concentration of the ethanol extract of P. australis had little effect on the indexes of A. philoxeroides. | |||
TO cite this article:ZHANG Zhen. Effects of the Extracts of Phragmites australis on the Growth of Alternanthera philoxeroides[OL].[13 May 2016] http://en.paper.edu.cn/en_releasepaper/content/4690286 |
2. Aerobic biodegradation of trichloroethylene by a bacterial community that uses hydrogen peroxide as the sole oxygen source | |||
ZHANG Shiyang,WANG Xiaoli,ZHU Ruili,Li Hui,WANG Ping,YANG Jie,LIN Kuangfei,GU Jidong,LIU Yongdi | |||
Environmental Science and Techology 04 June 2014 | |||
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Abstract:In this study, a bacterial community was enriched to aerobically degrade trichloroethylene (TCE) by using hydrogen peroxide (H2O2) as the sole oxygen source. The enriched bacterial community could degrade 120 mg/L TCE within 12 d in the presence of 8 mM H2O2, which was found to be the optimum concentration, and the efficiency of TCE degradation reached up to 80.6%. The bacterial community adapted to 2-8 mM H2O2 by increasing the activities of key enzymes, including catalase, superoxide dismutase, and peroxidase. 16S rRNA gene cloning and sequencing showed that the dominant species in the community belonged to Bordetella, Stenotrophomonas, Sinorhizobium, Variovorax, and Sphingobium. Polymerase chain reaction analysis revealed that phenol hydroxylase (Lph) gene was involved in TCE degradation in the presence of H2O2. Phenol induced the bacterial Lph gene, which catalyzed epoxidation of TCE. Our study findings might contribute to the in situ bioremediation of TCE-contaminated groundwater. | |||
TO cite this article:ZHANG Shiyang,WANG Xiaoli,ZHU Ruili, et al. Aerobic biodegradation of trichloroethylene by a bacterial community that uses hydrogen peroxide as the sole oxygen source[OL].[ 4 June 2014] http://en.paper.edu.cn/en_releasepaper/content/4599609 |
3. Effect of carbon tetrachloride stress on antioxidative performance of wheat seedlings | |||
Tao Honglin,Shan Aiqin | |||
Environmental Science and Techology 10 July 2011 | |||
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Abstract:To assess the CT toxicity to plants in soil, the antioxidative performance and the level of lipid peroxidation in wheat seedlings under CT stress were investigated by simulated experiments. The results indicated that: 1) The trend of activity of POD and SOD went to conformity, which were activated by CT ranging from 0.32 to 1.60 mgokg-1 and were inhibited by CT above 1.60 mgokg-1. 2) Under CT stress, the antioxidative performance of wheat seedlings was firstly activated within a short-term period, and then inhibited. 3) The lipid peroxidation of wheat seedlings wasn't obvious at CT concentration lower than 0.32 mgokg-1. But when CT concentration ranging from 0.32 to 1.60 mgokg-1, the MDA content increased obviously and the plasmalemma lipid could not be protected from peroxiding by activated POD and SOD. 4) At medium and late stage, the POD and SOD activity had a decreasing trend with increasing CT concentration, while the MDA content had significant positive correlation (with 99% confidence interval) with CT concentration. | |||
TO cite this article:Tao Honglin,Shan Aiqin. Effect of carbon tetrachloride stress on antioxidative performance of wheat seedlings[OL].[10 July 2011] http://en.paper.edu.cn/en_releasepaper/content/4435158 |
4. Implication of ecohydrology in environmental flow assessment for estuaries | |||
Xu Jing,Sun Tao | |||
Environmental Science and Techology 08 November 2010 | |||
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Abstract:In recent years, much attention has gradually been paid to environmental flow assessment for estuaries. Due to complex and multitude influencing factors, great challenges have been posed on environmental flow assessment for estuaries. Ecohydrology, integrating biological and hydrological process, was discussed as a scientific concept applied to problem-solving in environmental issues. An attempt, therefore, made here to reflect the advance and application prospect of ecohydrology in estuarine environmental flow assessment. Considering insufficient biological information of estuaries, simplified ecohydrology model by identifying the key aspects of estuarine ecosystem should be a significant tool in environmental flow assessment. | |||
TO cite this article:Xu Jing,Sun Tao. Implication of ecohydrology in environmental flow assessment for estuaries[OL].[ 8 November 2010] http://en.paper.edu.cn/en_releasepaper/content/4390914 |
5. Effect of arsenic on flavonoid contents in Pteris species | |||
Wang Hongbin ,Ye Zhihong | |||
Environmental Science and Techology 03 February 2010 | |||
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Abstract:Five flavonoids were determined in twco arsenic (As) hyperaccumulators (Pteris multifida and Pteris vittata) and a non-hyperaccumulator (Pteris semipinnata) from uncontaminated and As contaminated sites exposed to different As concentrations under hydroponic conditions by high-performance liquid chromatography (HPLC). The time-course effect of flavonoid induction in P. multifida and P. semipinnata were also studied under 0 and 20 mg As L-1 treatments at different time. There were no significant differences in contents of quercetin, isoquercitrin and kaempferol in the fronds, and also no significant differences in contents of rutin, quercetin, kaempferol and total flavonoids in the roots of the three plants studied under the same As treatment. As for time-course effect, significant differences were observed in contents of rutin, quercetin, hyperin, kaempferol and total flavonoids among times at 20 mg As L-1 treatment. In general, the changes of flavonoid contents in As hyperaccumulators did not directly contribute to As accumulation. | |||
TO cite this article:Wang Hongbin ,Ye Zhihong . Effect of arsenic on flavonoid contents in Pteris species[OL].[ 3 February 2010] http://en.paper.edu.cn/en_releasepaper/content/39862 |
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