4Hassen A, Saidi N, Cherif M, et al. Resistance of environmental bacteria to heavy metals [ J] . Bioresource Technology, 1998, 64: 7-15.
5Teng Y Q, Zhang X A, Fu Y, et al. Optimized ferrocene- funetionalized ZnO nanorods for signal amplification in electrochemical immunoassay of Escherichia coli [J] . Bios- ensors and Bioeleetronics, 2011, 26:4 661-4 666.
6Liu J, Li F, Liu C, et al. Effect of Cu content on the antibacterial activity of titanium-copper sintered alloys [J] . Materials Science and Engineering: C, 2014, 35: 392- 400.
7Veerapandian M, Sadhasivam S, Choi J, et al. Glu- cosamine fimctionalized copper nanoparticles: Preparation, characterization and enhancement of anti-bacterial activity by ultraviolet irradiation [J] . Chemical Engineering Jour- nal, 2012, 209: 558-567.