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Involvement of oxidative stress in UV-induced impairment of bacterial activity and culturability

机译:氧化应激在紫外线诱导的细菌活性损伤中的涉及和培养性

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The role of UV-induced oxidative stress (intracellular reactive oxygen species generation, DNA strand breakage and lipid peroxidation) in the inhibition of bacterial culturability and activity upon irradiation was assessed during experimental exposure of 9 different bacterial isolates to UV-B radiation. Intracellular ROS were quantified using the fluorimetric probe DCFH-DA. DNA strand breaks were determined using the fluorimetric analysis of DNA unwinding (FADU) method, while lipid peroxidation was assessed from the production of malonaldehyde (MDA). Bacterial culturability was assessed by enumeration of colony forming units (CFU) and bacterial activity was assessed by the incorporation of radiolabeled leucine. UV-B exposure resulted in a strong increase in intracellular ROS levels (12.4-42.3%), accompanied by enhanced formation of lipid peroxidation products (22.1-30.7%) in all strains. Bacterial culturability was inhibited by as much as 89.4% while bacterial activity was reduced by up to 99.6%. The results obtained reveal the contribution of oxidative stress in the impairment of bacterial culturability and activity and suggest the involvement of differences in the extent of oxidative damage in the variability of the responses of aquatic bacteria to UV-B radiation.
机译:在实验暴露于UV-B辐射的9种不同细菌分离物中,评估了UV诱导的氧化应激(细胞内反应性氧物质产生,DNA链断和脂质过氧化)在抑制细菌培养性和活性时进行辐照。使用荧光探针DCFH-DA定量细胞内ROS。利用DNA斩波(FADU)方法的荧光分析测定DNA链断裂,而脂质过氧化是从恶性醛(MDA)的产生中的。通过枚举菌落形成单位(CFU)评估细菌培养性,并通过掺入放射性标记的亮氨酸来评估细菌活性。 UV-B暴露导致细胞内ROS水平强烈增加(12.4-42.3%),伴随着所有菌株中的脂质过氧化产物(22.1-30.7%)的形成。细菌培养性高达89.4%,而细菌活性降低高达99.6%。得到的结果揭示了氧化胁迫在细菌培养性和活性损害中的贡献,并提示差异在水生菌对UV-B辐射的响应变异方面的程度上的累积。

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