Nowadays silver nanoparticles (AgNPs) are used as antimicrobial due to its well known physical, chemical, and biological properties. A large collection of bacterial cells adhering to a surface is called bacterial biofilm. Exposure to silver nano particles (AgNPs) may prevent colonization of new bacteria onto the biofilm. In the present work, we have investigated whether the biofilm format...

background: bacteremia due to enterococcus faecalis is usually caused by strains resistant to most antibiotics. effective management of the disease is dependent on rapid detection and characterization of the bacteria, and determination its sensitivity pattern to antimicrobial drugs. the aim of this study was to investigate a more rapid and reliable assay for simultaneous diagnosis of enterococc...

background and objectives: helicobacter pylori is the causative agent of peptic ulcer disease and a co-factor in development of gastric malignancies. lps are among toxic substances produced by h. pylori exhibiting low endotoxic activity compared to typical bacterial lps. the aim of this study was to investigate bioactivity of lps produced by different serotypes of helicobacter pylori compared t...

background: neisseria meninigitidis is one of the most frequently encountered microorganisms associated with central nervous system infections. the aim of this study was to evaluate a pcr-based assay for specific and rapid detection of n. meninigitidis in csf specimens.   methods : since april 2002 to july 2006, 130 csf specimens were collected from patients suspected of having bacterial mening...

Our objective in this study was to characterize prokaryotic sulphide production within the oxygenic, predominantly eukaryotic algal mat in an acidic stream, Nymph Creek, in Yellowstone National Park (YNP). We used microsensors to examine fluctuations in H2S and O2 concentrations over time through the vertical aspect of the approximately 3 mm mat in a 46-48 degrees C region of the creek. We also...

In this study, the effect of Carica papayaagainst various microorganisms is evaluated using DPPH (2,2-diphenyl-1-picryl-hydrazyl-hydrate) assay for antioxidant activity. The focus on employing antimicrobial and activities papaya milk as a natural by preparing hand sanitizer.Papaya (Carica Linn), nutraceutical fruit well known its nutritional values potent medicinal properties such antioxidant, ...

Soil is known to be heterogeneous for different activities at several spatial scales. Most studies have focused on macro- and meso-scales but micro-scales are rarely addressed. Hence, the spatial structure of NH(4)(+)- and NO(2)(-)-oxidizers and of various serotypes of the latter was studied along two transects of approximately 10 cm, with two micro-samples taken from each millimeter. The prese...