introduction: the aim of this study was to determine a proper cell line for adherance of helicobacter pylori and a suitable method for attachment of this bacteria to cell lines in vitro. material and methods: a total of 22 h.pylori strains,isolated from the antral biopsies of 49 patients with dyspepsia,gastritis,gastric ulcer,duodenal ulcer, etc., were evaluated by elisa(upr)to determine the di...

AIM To evaluate the number of bacteria extruded apically from extracted teeth ex vivo after canal instrumentation using the two engine-driven techniques utilizing nickel-titanium instruments (ProTaper and System GT). METHODOLOGY Forty extracted single-rooted human mandibular premolar teeth were used. Access cavities were prepared and root canals were then contaminated with a suspension of Ent...

Microfiltration of model cell suspensions combining macroscopic and microscopic approaches was studied in order to better understand microbial membrane fouling mechanisms. The respective impact of Saccharomyces cerevisiae yeast and Escherichia coli bacteria on crossflow microfiltration performances was investigated using a multichannel ceramic 0.2 µm membrane. Pure yeast suspensions (5 µm ovoid...

BACKGROUND Endodontic instrumentation carries the risk of over extrusion of debris and bacteria. The technique used and the type of instrumentation influences this risk. AIM The purpose of this study was to evaluate and compare the K-file, ProTaper hand and ProTaper rotary instrumentation systems for the amount of apically extruded debris, irrigant solution and intracanal bacteria. DESIGN E...

Biological rarticles in liquid suspension exhibit varied electrophoretie mobili:y dependent upon the electric charge behavior of their surface constituents. The surface composition of a population of the same kind of biological particles is uniform in a constant environment. The microscope electrophoresis techniques for mobility and isoelectric point determinations of microscopic particles (bac...

D URING the investigation of a recent epidemic of septic sore throat' the writers of this article ook occasion to make a fairly extensive .urvey of the literature of the strepto:occi with special reference to their relaion to the spread of disease through milk. Che results of this survey, together with :ertain observations made in the course of he investigation, have impressed us with he fact t...

BACKGROUND Nitrofurantoin is a nitrofuran antibiotic that has been used for treatment of urinary tract against positive and negative bacteria. OBJECTIVES The aim of this study was to evaluate the effect of structural vehicles and flocculating agents on physical stability and rheological behavior of nitrofurantoin suspension. MATERIALS AND METHODS To formulate the suspensions, the effect of ...

In a search for microorganisms antagonistic to bacteria, especially to the gram-negative ones, the bacterial-agar plate method was used (Waksman and Woodruff, 1940a). This consists in adding a suspension of washed living bacteria to 1.5 per cent sterile washed agar containing 0.5 per cent NaCl and 0.5 per cent K2HPO4. To a fresh field or garden soil, or one previously enriched several times wit...

the photocatalytic activity of nano-tio2 has been used in inactivation of microorganisms, mainly in the form of suspension in a liquid or partially in an immobilized system. using advanced oxidation processasa new approach has been used in the purification of water and wastewater. in this research, the systems of suspended (0.1 g/l) and immobilized nano-tio2 in the cement bed (0.1-2%) under a 1...

Objectives: This study aimed to assess the antimicrobial effects of aloe vera hydroalcoholic extract and 0.2% chlorhexidine (CHX) mouthwash on Streptococcus sanguinis (S. sanguinis), Streptococcus salivarius (S. salivarius) and Streptococcus mutans (S. mutans) in vitro. Materials and Methods: Four concentrations (25%, 50%, 75% and 100%) of hydroalcoholic extract of aloe vera were prepared. S. ...