Escherichia coli: dominance of red light over other visible light sources in establishing viable but nonculturable state.

In this study, the effect of UV-A and different wavelengths of visible light irradiations combined with or without a photosensitizer (methylene blue, MB) on the establishment of viable but nonculturable (VBNC) state in Escherichia coli was investigated. Survival of the E. coli was investigated by measuring plate counts, respiring cell count (RCC), direct viable count (DVC) and total counts over a period of up to 72 h.

Viable but non-culturable state (VBNC) of Escherichia coli related to EnvZ under the effect of pH, starvation and osmotic stress in sea water.

When exposed extreme environmental conditions such as sea water, bacteria have been shown different survival strategy for continue their life. One of this strategy known as viable but nonculturable (VBNC) state which is very important for nondifferiation bacteria. VBNC cells cause serious human health problems.

Antimicrobial activity of some sulfonamide derivatives on clinical isolates of Staphylococus aureus.

Background: Staphylococcus aureus is a non-motile, gram positive, non-sporforming, facultative anaerobic microorganism. It is one of the important bacteria as a potential pathogen specifically for nosocomial infections. The sulfonamide derivative medicines are preferred to cure infection caused by S.