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Heavy-Metal Tolerance and Antibiotic Susceptibility of Red Pigmented Bacteria Isolated from Marine Environment

机译:海洋环境中红色色素细菌的重金属耐受性和药敏性

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摘要

This study was undertaken to determine heavy metal resistance and antibiotic susceptibility of three non-pathogenic red pigmented bacteria namely WPRA3, SM11-3j and SC-G18, isolated from marine environments of Malaysia. The bacteria isolates were identified by 16S rRNA sequencing and by biochemical and morphological tests. The 16S rRNA gene sequences of all isolates showed ≥96% similarity to Serratia spp. Antibiotic susceptibility test of isolates was assayed according to the Kirby-Bauer disc diffusion method. All isolates were highly resistant to beta-lactam antibiotics, but were susceptible to quinolone antibiotics. Minimum inhibitory concentration (MIC) of nine heavy metals (Ni2+, Co2+, Cr3+, Zn2+, Mn2+, Pb2+, Hg2+, Cd2+ and Cu2+) against the bacteria isolates were determined via the plate-dilution method. The isolates exhibited resistance to Ni2+, Co2+, Cr3+ and Zn2+. Isolates WPRA3 and SM11-3j showed higher multiple tolerances to heavy metals. The results obtained indicate that bacteria from marine environments of Malaysia present interesting metabolic activities, which should be studied and explored for potential biotechnological applications.
机译:这项研究旨在确定从马来西亚海洋环境中分离出的三种非致病性红色色素细菌WPRA3,SM11-3j和SC-G18的重金属抗性和抗生素敏感性。细菌分离物通过16S rRNA测序以及生化和形态学测试进行鉴定。所有分离株的16S rRNA基因序列与沙雷氏菌的同源性≥96%。根据Kirby-Bauer纸片扩散法对分离株进行抗生素敏感性测试。所有分离株均对β-内酰胺类抗生素高度耐药,但对喹诺酮类抗生素敏感。通过平板稀释法确定了九种重金属(Ni2 +,Co2 +,Cr3 +,Zn2 +,Mn2 +,Pb2 +,Hg2 +,Cd2 +和Cu2 +)的最小抑菌浓度(MIC)。分离株表现出对Ni2 +,Co2 +,Cr3 +和Zn2 +的抗性。隔离株WPRA3和SM11-3j对重金属的多重耐受性更高。获得的结果表明,来自马来西亚海洋环境的细菌表现出有趣的代谢活动,应进行研究和探索以用于潜在的生物技术应用。

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