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以海洋来源放线菌无活性野生株HLF-43为出发菌,通过微波诱变结合新霉素抗性筛选,得到新霉素抗性突变株共128株,其中微波诱变新霉素抗性株117株、自发突变抗性株11株。经活性筛选,8株微波诱变新霉素抗性突变株对K562细胞有一定抑制作用,100μg/mL发酵样品对K562细胞的抑制率20%。经对不同微波辐照时间和不同浓度新霉素组合筛选实验结果的比较分析,初步确定对HLF-43的微波辐照诱变最佳时间为120 s。  相似文献   
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After discarding marine microorganisms from conchocelis of Porphyra yezoensis and Porphyra ha/tanens/s, their axenic cultures were obtained through treatment with antibiotics. Antibiotic disc tests were carried out to determine the effectiveness of each antibiotic in eliminating contaminating microorganisms. Five of 12 antibiotics tested were selected and used to produce the axenic cultures in this study, which showed that 200 μg/mL streptomycin, 250 μg/mL penicillin, 252 μg/mL kanamycin, 30 μg/mL neomycin, 200 μg/mL chloramphenicol were effective concentrations for eliminating microorganisms from conchocelis when antibiotics were added singly step by step; whereas simultaneous combination of 150 μg/mL streptomycin, 250 (or 350) μg/mL penicillin, 150 (or 250) μg/mL kanamycin, 70 μg/mL neomycin and 200 μg/mL chloramphenicol was also effective for producing the axenic cultures. However,it seemed that the treatments with antibiotics applied individually were more feasible than those with all antibiotics added at the same time. This may be due to the combined inhibiting effect of antibiotics on the growth and development of conchocelis.  相似文献   
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随着抗菌药物在水产养殖中用量的增加及混合使用现象的出现,水产病原菌表现出更强的耐药性甚至是多重耐药性,大大增加了水产养殖中细菌性病害防治的难度。细菌耐药性最常见的传递方式是耐药质粒的转移。本研究通过对多个水产致病弧菌质粒上新霉素及卡那霉素的耐药基因aph3'')-IIa进行检测分析,并利用电穿孔法将筛选得到的3个受试菌株上的质粒分别转入大肠杆菌中,结果从3个转化子中检测到目的基因。进一步的药敏测试结果显示,3个转化子的最小抑菌浓度(MIC值)以及最小杀菌浓度(MBC值)均明显上升。可见,在特定条件下,水生致病性弧菌对氨基糖苷类(新霉素和卡那霉素)的耐药质粒可转移至大肠杆菌并参与介导其耐药性,大大降低了受体菌对新霉素和卡那霉素的敏感性。本研究将为环境弧菌与临床细菌对氨基糖苷类药物的抗性传递研究提供数据基础和参考依据。  相似文献   
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