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351.
CHENG Yangjian XIE Yongming ZHENG Jing WU Zhaoxian CHEN Zhi MA Xiaoyan LI Bin LIN Zhang 《环境科学学报(英文版)》2009,21(12):1673-1678
A Gram-negative, chromium(VI) tolerant and reductive strain CTS-325, isolated from a Chinese chromate plant, was identified as Ochrobactrum anthropi based on its biochemical properties and 16S rDNA sequence analysis. It was able to tolerate up to 10 mmol/L Cr(VI) and completely reduce 1 mmol/L Cr(VI) to Cr(III) within 48 h. When the strain CTS-325 was induced with Cr(VI), a protein increased significantly in the whole cell proteins. Liquid chromatography tandem mass spectrometry (LC-MS/MS) analysis revealed that this protein was a superoxide dismutase (SOD) homology. The measured superoxide dismutase activity was 2694 U/mg after three steps of purification. The SOD catalyzes the dismutation of the superoxide anion (O2·−) into hydrogen peroxide and molecular oxygen. This protein is considered to be one of the most important anti-oxidative enzymes for O. anthropi as it allows the bacterium to survive high oxygen stress environments, such as the environment produced during the reduction process of Cr(VI). 相似文献
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Removal of noxious dyes is gaining public and technological attention. Herein grafting polymerization was employed to produce a novel adsorbent using acrylic acid and carboxymethyl cellulose for dye removal. Scanning electron microscopy and Fourier-transform infrared spectroscopy verified the adsorbent formed under optimized reaction conditions. The removal ratio of adsorbent to Methyl Orange, Disperse Blue 2BLN and malachite green chloride reached to 84.2%, 79.6% and 99.9%, respectively. The greater agreement between the calculated and experimental results suggested that pseudo second-order kinetic model better represents the kinetic adsorption data. Equilibrium adsorptions of dyes were better explained by the Temkin isotherm. The results implied that this new cellulose-based absorbent had the universaiity for removal of dyes through the chemical adsorption mechanism. 相似文献
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以PM10、SO2和NO2作为空气质量的评价对象,采用空气综合污染指数法研究了哈尔滨市2001年到2015年的环境空气质量变化趋势.以空气综合污染指数作为因变量,哈尔滨市人均GDP作为自变量,来探讨哈尔滨环境空气质量与经济增长之间的关系.得出2001年到2015年期间,哈尔滨环境空气质量呈现先变好又变差再变好的趋势,哈尔滨环境空气质量与经济增长之间呈现近似三次方函数关系,且部分呈现到"U"型曲线关系. 相似文献
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Yuebing Sun Qixing Zhou Shuhe Wei Liping Ren 《Frontiers of Environmental Science & Engineering》2007,1(1):107-113
Rorippa globosa has been identified as a newly-found Cd-hyperaccumulating species. In the present study, growth responses of Rorippa globosa and its accumulation characteristics of Cd and As were examined under joint stress of Cd and As. The results showed that Cd and As had an antagonistic effect on enhancing the growth of Rorippa globosa plants and Cd uptake and accumulation under the low concentration Cd and As treatments. When the concentration of Cd in the soil was 10 mg/kg and the concentration of As was 50 mg/kg, the highest growing height of the plant was up to 35.9 cm and the dry weight of the shoots was up to 2.2 g/pot, respectively. Meanwhile, the accumulation of Cd in the leaves under the joint stress was higher than that at the same level under single Cd pollution. However, there were synergic adverse effects on plant growth and Cd uptake under the combined pollution from a high concentration of Cd and As. Meanwhile, the accumulation of As in the roots was greater than that in the shoots, the translocation factor (TF) was ?0.3 and the bioaccumulation factor (BF) was ?0.6, thus showing that Rorippa globosa had an excluding effect on As uptake. These results confirmed that Rorippa globosa had a strong tolerant ability to the joint stress of Cd and As, and the potential for phytoremediation of soils contaminated by Cd and As. 相似文献
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植物耐受和解除重金属毒性研究进展 总被引:8,自引:0,他引:8
总结了植物细胞及分子水平对重金属耐性和解除其毒性的途径.植物通过避免增加细胞内敏感位点毒物浓度来解除重金属毒性.其途径主要有:一方面通过菌根化、细胞壁吸收及根系分泌物的螯合作用减少根系吸收重金属进入细胞质;另一方面通过体内调节机制解除重金属毒性和提高耐性,主要通过一系列膜蛋白对进入细胞质内的重金属排出细胞质外、隔离于液泡中,或将重金属转变为无毒性形态挥发入大气,或通过细胞质内的植物螯合素、金属硫蛋白、有机酸、氨基酸、多胺等对重金属螯合,解除重金属毒性;同时植物还可以在重金属胁迫下产生热休克蛋白修复胁迫伤害的蛋白质.本文提供了涉及植物重金属解毒和耐性广泛的观点和证据. 相似文献
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