probiotics are beneficial microorganisms of intestine with useful effects on growth and health of the animals by the colonization. in present study, effects of two different probiotic as bacillus subtilis and saccharomyces cerevisiae were investigated on growth parameters, survival, and body composition of a. franciscana. also the resistance against pathogenic bacteria of vibrio campbellii was ...

lactic acid bacteria (lab) are gram positive and non- spore forming bacteria that can produce some special substances for growth inhibition of pathogenic, non-pathogenic and food spoilage bacteria. the aim of this study was to determine the inhibitory effects of lactobacillus acidophilus ptcc1643 (dsm 20079) and lactobacillus plantarum ptcc 1058 (atcc 8014) cultural supernatants against urinary...

Discovering virulence factors of pathogenic bacteria is a key in understanding pathogenesis and for identification of targets for novel drugs and design of new vaccines. Comparative genomics, transcriptomics, and proteomics have become the popular tools in discovering the virulence factors in bacterial pathogens, such as Neisseria meningitidis, Yersinia pestis, Mycobacterium tuberculosis, and S...

The growing bacterial resistance to antibiotics calls for the elaboration of new pathogens elimination strategies. Some of these methods are based on the conjugative transfer of recombinant plasmids able to eliminate pathogenic recipients by plasmid run-away replication or by killing activity of plasmid-encoded bacteriocins. Using live bacteria as donors of plasmid vectors carrying killing dete...

We developed a method to predict bacterial pathogenicity against mammals by measuring bacterial virulence in silkworms at 37°C, human body temperature. One hundred and twenty-two strains of bacteria were isolated from the intestines of fish and shellfish and tested for their virulence against silkworms. Overnight cultures of 50 strains killed at least 50% of the silkworms when injected into the...

Pathogenic bacteria possess intricate regulatory networks that temporally control the production of virulence factors, and enable the bacteria to survive and proliferate after host infection. Regulatory RNAs are now recognized as important components of these networks, and their study may not only identify new approaches to combat infectious diseases but also reveal new general control mechanis...

This minireview summarizes the historical development of bacterial population genetic concepts since the early 1980s. Initially multilocus enzyme electrophoresis was used to determine population structures but this technique is poorly portable between laboratories and was replaced in 1998 by multilocus sequence typing. Diverse population structures exist in different bacterial species. Two dist...

The scientific community working in the field of insect pathology is experiencing an increasing academic and industrial interest in the discovery and development of new bioinsecticides as environmentally friendly pest control tools to be integrated, in combination or rotation, with chemicals in pest management programs. In this scientific context, market data report a significant growth of the ...

In this paper, we report a method for fabricating biofunctionalized nanoparticles by attaching human immunoglobulin (IgG) onto their surfaces through either electrostatic interactions or covalent binding. We found that these IgG-presenting nanoparticles can bind selectively to the cell walls of pathogens that contain IgG-binding sites based on the investigation of transmission electron microsco...