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Mathivanan Krishnamurthy Chandirika Jayaraman Uthaya Vinothkanna Annadurai Govindarajan R. K. Meng Delong Yin Huaqun 《Journal of Polymers and the Environment》2021,29(6):1742-1751
Journal of Polymers and the Environment - In this study, the production and physicochemical characterization of exopolysaccharide (EPS) produced by Lysinibacillus fusiformis KMNTT-10 were... 相似文献
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The concentrations of copper in water and sediment samples of Cuddalore coastal area, Tamil Nadu, India were examined. The isolation, characterization, screening, and metal sorption capabilities of copper-resistant bacteria (CURB) also were investigated. Biosorption capabilities and growth time varied among the resistant isolates. All isolates reduced more than 80% of copper from copper-treated broth. However, Bacillus cereus CURB-4 strain absorbed more copper ions (99.9%) than other resistant isolates. Changes in structural group position and synthesis of extracellular polysaccharides (EPS) of CURB-4 strain under copper stress and controlled conditions also were examined. Under copper stress condition, CURB-4 produced more EPS (71 ± 0.6%) compared to control conditions (66 ± 0.4%). Fourier transform infrared spectroscopy revealed that the changes in functional group position of EPS were observed in stressed condition. Overall, synthesis of EPS in bacteria is a protective barrier against environmental stress. 相似文献
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K. Mathivanan 《Chemistry and Ecology》2014,30(7):622-635
A total of 35 bacterial strains were isolated from the industrially polluted Cuddalore coast, on the southeast coast of India. Of these, 17 strains were cadmium resistant and the remainder were sensitive. Six strains (C-1, C-8, C-10, C-12, C-14 and N-1) were selected based on high levels of cadmium tolerance (>150 mg L?1) and were termed highly cadmium-resistant bacteria (HCRB). These HCRB were identified on the basis of morphological, biochemical and partial sequencing of their 16S rRNA genes. The antibiotic-susceptibility patterns and minimum inhibitory concentrations (MIC) of different metals (Cu2+, Pb2+ and Zn2+) against each HCRB were determined. Among the isolates, C-14 showed high degrees of metal and antibiotic resistance compared with other HCRB. Growth rates of HCRB at two different Cd2+ concentrations (50 and 100 mg L?1) and under different metal conditions (Cd2+, Cu2+ and Pb2+) were also investigated. HCRB growth rates were lower in the metal-treated condition than in the untreated condition. Isolates C-14 and N-1 removed>80% of Cd2+ from cadmium-treated broth. However, isolate C-14 removed 92.3% of Cd2+ compared with 86.5% for isolate N-1. Bacteria showing residual growth rates under metal stress conditions might be useful in metal removal applications under growing conditions. 相似文献
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