Effect of Heavy Metal Stress on Microbial Growth

To study the effects of heavy metal stress on microbial growth,taking Escherichia coli,Bacillus subtilis,Saccharomyces erevisiae and Streptomycetaceae as experimental materials,the growth status of the four microbes under heavy metal stress(Hg2 +,Cd2 +,Cr6+ and Pb2 +) were studied by traditional microbiological culture methods.The results showed that heavy metal ions in low concentrations helped the four microbes to grow.But inhibited in high concentration.G+ was more sensitive than G-;The four microbial sensitivity order was Streptomyces B.subtilis E.coli S.erevisiae;the toxic order was Hg2+ Cd2+ Cr6+ Pb2+.