THE EFFECTS OF SOME ENVIRONMENTAL FACTORS ON THE ENTEROBACTER GROUP

Abstract

Abstract In nature, E. coli takes place in different forms, separate from commensal to human or animal hosts pathogenies. Though E. coli genetics, physiology, and biochemistry have been extremely elaborated, there is not recognize in passing how they behave in natural habitats. Such an environment has been separated in a primary that is animal-human host-related, while the secondary is non-host-related habitat.. Thus, this study comes to investigate how its survival in different concentrations of different environmental variables and assess the potential effects of some environmental factors (salinity, sulfates, and chloride) on the enterobacter group. API20E kit and VITEK®2 GN were used to identification of studied bacteria. We identified five strains of enterobacter bacteria and one mix-bacteria to test the hypothesis of the current study and using normal saline for preparing serial dilutions. The results showed that the increase of salinity could affect studied bacteria significantly (p-value <0.01), also the increasing of sulfate (as NaSO4) was leading to significantly inhibited of bacterial growth at > 600 mg/L sulfates (p-value <0.01), while the concentration in-between 400-500 mg/L was worked positively with all of the studied bacteria, moreover there were negative effects of different concentrations of chloride (P-value < 0.01), except Var.2 was increased with adding 2gm/L of chloride.