The Effect of some disinfectants on the growth of the Nocardia asteroides bacteria isolated from soil .

Abstract

The effect of ethanol , formalin , and phenol with different time was studied against Nocardia asteroides bacteria isolated from soil .The study showed that Ethanol disinfectant has good activity against this bacteria which has ability to inhibit the growth of bacteria at concentrations of (10 , 30 , 50 , 70) %in different time intervals. The study also showed that formalin disinfectant has no ability to inhibit the growth of bacteria after (15, 30) minutes of intervals while the concentration (30) % of the disinfectant was with limited effect the growth of bacteria after (45) minutes of intervals , and the other concentrations of formalin were have the ability to inhibit the growth of this bacteria with increase in treatment time.The study proved that the (2, 4, 6) % concentration of phenol disinfectant with (15, 30, 45) minutes had no effect on the growth of bacteria while the other concentrations (8, 10) % of phenol had ability to inhibition the growth of bacteria during (60, 90, 120) minutes of intervals. The study showed that sensitivity of bacteria to the disinfectant increases with increase of disinfectant concentration and treatment time.