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羊源大肠杆菌的分离鉴定与耐药性分析
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作者 蒋昀轩 杨亚 魏凯 《山东畜牧兽医》 2024年第1期10-14,共5页
本实验室接收到一份来自山东省济南市莱芜区的黑山羊乳羔羊腹泻病例,通过细菌的分离鉴定和病原学检验,筛选出一株大肠杆菌分离株。PCR试验结果显示,该分离株对磺胺类、β-内酰胺类、四环素类等药物有相关耐药基因;药敏试验显示,抑菌圈... 本实验室接收到一份来自山东省济南市莱芜区的黑山羊乳羔羊腹泻病例,通过细菌的分离鉴定和病原学检验,筛选出一株大肠杆菌分离株。PCR试验结果显示,该分离株对磺胺类、β-内酰胺类、四环素类等药物有相关耐药基因;药敏试验显示,抑菌圈直径较小,其耐药性强且与PCR检测结果相对应。结果提示,强耐药性大肠杆菌已在养羊业存在,从业人员和政府部门应当引起重视。 展开更多
关键词 大肠杆菌 腹泻 分离鉴定 强耐药性
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Valence variation of arsenic in bioleaching process of arsenic-bearing gold ore 被引量:8
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作者 崔日成 杨洪英 +2 位作者 陈森 张硕 李科峰 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2010年第6期1171-1175,共5页
The concentration and variational trend of As3 +and As 5+,the bacterial resistance for the As 3+and As 5+and converting conditions from As3 +to As 5+were analyzed.The additive was used to prompt the bacterial leaching... The concentration and variational trend of As3 +and As 5+,the bacterial resistance for the As 3+and As 5+and converting conditions from As3 +to As 5+were analyzed.The additive was used to prompt the bacterial leaching efficiency by changing valence state of arsenic.The results show that the concentration of As 3+ is larger than that of As 5+ in the lag phase.The concentration of As 3+ decreases in the log phase,and is lower than that of As5 +.HQ-0211 typed bacteria express better resistance for As 3+and As 5+and remain growing when the concentrations of As3 +and As 5+are above 6.0 g/L and 12.0 g/L,respectively.It is found that Fe 3+cannot oxidize As3 +singly as strong oxidant in the leaching system,but can cooperate with pyrite or chalcopyrite to do that.The oxidation of As 3+ is prompted with addition of H2O2.The bacterial activity is improved in favor of bacterial leaching efficiency.NaClO restrains the bacterial growth to depress leaching efficiency because of the chloric compounds affecting bacterial activity. 展开更多
关键词 As^3 As ^5+ bacterial leaching arsenic resistance OXIDANT arsenic-bearing gold ore
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