Effect of photocatalysis (TiO/UV) on the inactivation and inhibition of virulence factors expression.

Water disinfection using visible light-active photocatalyst has recently attracted more attention due to its potential to inactivate microbes. In this study, we have investigated the efficiency of photocatalysis (TiO/UV) on the inactivation of and the attenuation of its virulence factors. For this aim, the photocatalytic effects of TiO/UV on the cultivability and viability of were investigated.

The application of phage reactivation capacity to sens bacterial viability and activity after photocatalytic treatment.

We purpose in this study to develop a reliable and low-cost method for the detection of Viable but nonculturable (VBNC) bacteria. Indeed, after water disinfection, injured-VBNC bacteria can be underestimated using conventional assessment methods, causing false-negative results and, posing a significant and potential health risk. The VBNC bacterial survival strategy can hide the real microbial quality of treated water.

Detection of active pathogenic bacteria under stress conditions using lytic and specific phage.

In this study, we have monitored the potential activity of a foodborne and waterborne pathogenic bacterium, Salmonella typhi, under starvation conditions. The interaction between lytic phage and starved-VBNC pathogenic bacteria was studied to establish reliable methods for the detection of active cells before resuscitation. The analysis of phage kinetic parameters has demonstrated the flexibility of lytic with the quantity and mainly the quality of host cells.

ZnO Nanorods with High Photocatalytic and Antibacterial Activity under Solar Light Irradiation.

ZnO nanorods (NRs) with an average length and diameter of 186 and 20 nm, respectively, were prepared through a mild solvothermal route and used as photocatalysts either as dispersed powder or immobilized on glass slides. The ZnO NRs were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), and X-ray diffraction (XRD). Dispersed ZnO NRs and, to a lesser extent, immobilized ZnO NRs were demonstrated to exhibit high photocatalytic activity under simulated sunlight of low intensity (5.

Comparative study of Gram-negative bacteria response to solar photocatalytic inactivation.

Solar photocatalytic inactivation of Gram-negative bacteria with immobilized TiO-P25 in a fixed-bed reactor was modeled with simplified kinetic equations. The kinetic parameters are the following: the photocatalytic inactivation coefficient (k), the initial bacterial reduction rate (A) in the contact with the disinfecting agent, and the threshold level of damage (n) were determined to report the effect of Q/TiO-P25 on bacterial cultivability and viability and to compare the response of bacterial strains to photocatalytic treatment. In addition, the integration of the reactivation coefficient (C) in the photocatalytic inactivation equation allowed evaluating the ability of bacterial reactivation after photocatalytic stress.