铜耐性优势植物根际土壤铜抗性菌株的筛选及其对铜的促溶作用

从铜矿废弃地重金属耐性优势植物根际土壤中分离筛选到两株抗高浓度Cu的细菌菌株HQN2和JYC17。对菌株HQN2和JYC17溶解难溶性Cu的作用进行了研究。结果表明:菌株HQN2和JYC17具有明显的溶解碳酸铜的能力,与接灭活菌对照相比,菌株HQN2和JYC17分别使培养液中水溶性Cu含量增加306%和136%,培养液的pH由初始的7.00分别降低到4.08和4.46,另外,Cu能促进供试菌株有机酸(葡萄糖酸、苹果酸和乙酸等)的合成。菌株HQN2和JYC17对土壤中难溶性Cu亦有明显的促溶作用。与接灭活菌对照相比,菌株JYC17和HQN2分别使土壤中交换态Cu含量增加110%和270%。经生理生化特征分析及16SrDNA序列分析,菌株HQN2和JYC17分别被鉴定为节杆菌属(Arthrobactersp.)和微杆菌属(Microbacteriumsp.)。

Review of copper and copper alloys as immune and antibacterial element

This review discussed the relationship among copper,human,and bacteria.Copper plays an important role in human immunity.Copper can boost human immune defense reactions at recommended intake level.The content mainly focused on copper antibacterial activity and copper antibacterial mechanisms.Conclusions stated that copper antibacterial activity is affected by copper homeostasis mechanisms in bacteria,adhesion,humidity,strain specificity,and manufacturing methods of antibacterial agents.For the preparation of particle antibacterial agents and surface antibacterial agents,this review discussed several manufacturing methods,such as sol−gel,cold spray,and biosynthesis belonging to chemical synthesis,physical synthesis,and biological synthesis,respectively.Sol−gel method contributes to the preparation of particle agents and surface agents.Cold spray technique is utilized in synthesis of surface copper agent.Biosynthesis is a novel technology which can be applied in nanoparticle agent preparation.