The taxonomy of bacteria (or of any other group of organisms) consists of three interrelated areas. The task of arranging organisms into related groups is called classification. Nomenclature refers to the assignment of names to these groups, guided by a set of rules. Identification is the process of determining to which established taxon a new isolate or unknown strain belongs. This last task i...

Biosurfactants are extracellular surface active compounds produced by bacteria, fungi and yeast. Most microbial surfactants are complex molecules, comprising different structures that include lipopeptides, glycolipids, polysaccharide protein complexes, fatty acids and phospholipids. In the past two decades, biosurfactants have gained increasing attention due to their useful properties such as b...

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...

ornithobacterium rhinotracheale (ort) is a respiratory pathogen which has been isolated throughout the world from numerous bird species. the present study was designed to isolate and characterize the ort from domestic turkeys, quails and pigeons. for this purpose, 250 samples from each bird species (turkey, quail and pigeon) with or without respiratory signs were tested by taking of tracheal...

Cancellous bones from twenty five live tissue donors were tested for bacterial contamination and initial bioburden ranged from 4.1×10 to 3.1×10 cfu/g (average 9.0×10 cfu/g). Forty six representative bacterial isolates were characterized on the basis of morphological, cultural and biochemical characteristics. Staphylococcus spp. was found to be predominant contaminant in tissue samples (41.30%)....

Agrotis segetum Schiff. (Lepidoptera: Noctuidae) is one of the most serious pests of nearly all vegetables in Turkey. In this study, to find a more effective and safe biological control agent, the bacterial flora of Agrotis segetum were investigated in larvae collected from different populations in the vegetable fields of the Black Sea region of Turkey, and 9 bacterial isolates were cultured fr...

background: urinary tract infection (uti) is considered as the most common bacterial infectious disease seen among the pediatric patients. the aim of this study was to investigate the prevalence and antimicrobial susceptibility of bacterial uropathogens isolated from the pediatric patients with urinary tract infections. methods: this descriptive study was conducted in children medial center, te...

background : the objectives of this study were to assess the antibiotic resistance and clonality of the bacteria isolated from patients with long- (ltc) and short-terms catheterizations (stc). methods : a total of 31 clinical staphylococcus aureus isolates were collected from loghman hospital of tehran, iran. in vitro biofilm formation ability was determined by microliter tissue culture plates....

Plant growth promoting rhizobacteria (PGPR) are known to influence plant growth by various direct or indirect mechanisms. In search of efficient PGPR strains with multiple activities, a total of 150 bacterial isolates belonging to Bacillus, Pseudomonas, Azotobacter and Rhizobium were isolated from different rhizospheric soil of chick pea in the vicinity of Allahabad. These test isolates were bi...

background and objectives: isolation of xanthomonas campestris from soil has a wide range of applications from monitoring of phytopathogenic populations in soil to screening of improved xanthan-producing strains. identification of xanthomonas campestris and its pathovars requires pathogenicity tests in addition to phenotypic and molecular characterization. materials and methods: thirty phenotyp...