There has been growing concern over human exposure to adenoviruses through drinking water due to the extreme resistance of human adenoviruses to the traditional UV technology (low-pressure (LP) UV). As an effort to develop an effective treatment strategy against human adenoviruses in drinking water, we determined the effectiveness of sequential disinfection with an alternative UV technology (me...

The recently discovered (by Wekhof, [1]) disinfection mechanism with a pulsed UV light has been found to have a unique potential for the control of various hospital-acquired infections and for the sterilisation of food packaging or of packaged medical solutions. One requirement of this UV mechanism is the need to adjust the percentile components of UVC, UVB and UVA emitted by the the pulse sour...

OBJECTIVE To evaluate the surface roughness of acrylic resin submitted to chemical disinfection via 1% sodium hypochlorite (NaClO) or 1% peracetic acid (C2H4O3). MATERIALS AND METHODS The disc-shaped resin specimens (30 mm diameter ×4 mm height) were polymerized by heated water using two cycles (short cycle: 1 h at 74°C and 30 min at 100°C; conventional long cycle: 9 h at 74°C). The release o...

There has been a concern that Clostridium botulinum might enter a defective can of low-acid food through a microleak after thermal processing and during the cooling process. This paper reviews most current surveys on bacteriological quality of cannery cooling water, bacteriological testing methods in cannery cooling water, disinfection of container cooling water in canning systems, and common t...

Context: Gutta percha are known to be contaminated during storage and intra operative manipulation. Chair side disinfection of these points is important and critical for success of endodontic therapy. Gutta percha being heat labile, chemical disinfection is the only viable alternative which takes longer time and may leave a residue. Herbal gels are known to have antimicrobial , antiseptic prope...

BACKGROUND: The current standards for chlorine and monochloramine disinfection of drinking water were established using information obtained from bench-scale disinfection experiments of monodispersed hepatitis A virus. It is not clear whether these standards are sufficient for the four virus types listed on the CCL2. Several disinfection studies have been conducted on representative coxsackievi...

This study reports the analogies and differences found when comparing TiO(2) photocatalytic treatment for chemical oxidation and microorganisms inactivation, using methylene blue and Escherichia coli as references, respectively. In both processes the activation is based on the same physicochemical phenomena and consequently a good correlation between them is observed when analyzing the effect o...

One of the most common pathogens in infection of hydrogel contact lens wearers is Pseudomonas aeruginosa, which can gain access to the eye via contamination of the lens, lens case, and lens care solutions. Only one strain per species is used in current regulatory testing for the marketing of chemical contact lens disinfectants. The aim of this study was to determine whether P. aeruginosa strain...

tion dates back to the mid 18th century. Chlorinated lime and chlorine gas have since been used for conventional disinfection of municipal drinking water for the prevention of epidemic diseases such as cholera and typhoid.1–3 Generation of chlorine by electrolysis of aqueous NaCl solution had come into use by the end of the 19th century. The advantage of the electrolysis is that transportation ...

This aim of this study was to evaluate and compare the efficacy of different chemical methods to disinfect gutta-percha cones (GP). Eighty-six size 80 GP cones were used. The cones were contaminated by immersion in saliva and Enterococcus faecalis. Four chemical agents were used: 1% sodium hypochlorite (G1), 2% chlorhexidine gluconate (G2), 10% povidone iodine (G3) and 0.9% saline solution (G4)...