Directional dispersal plays a large role in shaping ecological processes in diverse systems such as rivers, coastlines and vegetation communities. We describe an instability driven by directional dispersal in a spatially explicit consumer–producer model where spatial patterns emerge in the absence of external environmental variation. Dispersal of the consumer has both undirected and directed co...

background and objectives: biofilms are structural communities of bacterial cells enshrined in a self produced polymeric matrix. the studies on biofilm formation of pasteurella multocida have become imperative since it is a respiratory pathogen and its biofilm mode could possibly be one of its virulence factors for survival inside a host. the present study describes a biofilm assay for p. multo...

biofilm formation in bacteria is an important survival strategy. biofilm of probiotic bacillus subtilis consist of long chains of cells that are covered by a polymeric matrix of exopolysaccharides. this bacterium is known as one of the most effective biocontrol agents against plant pathogens and has a high ability in biofilm formation. this study was aimed to investigate the effect of some envi...

wound infections are a common cause of staphylococcal infections. an ability of s.aureus is to adhere and form biofilm on host surfaces. biofilm is an exopolysaccharide, a slime matrix around multiple layers of cells and is mediated by expression of the icaadbc operon. the present study evaluated the biofilm forming capacity and the presence of icaad gene among s.aureus isolated from wound infe...

Since Marshall, the standard approach to developing a theory of competitive markets is to separate demand behavior (“consumer theory”) from supply behavior (“producer theory”) and then use the notion of market equilibrium to reconcile demand and supply. This note studies producer theory and a separate one studies consumer theory. The standard model has the following features. Firms are describe...

Objective(s) Methicillin-resistant Staphylococcus aureus (MRSA) is an important cause of nosocomial and community infections. Biofilm formation, mediated by a polysaccharide intercellular adhesin (PIA) and encoded by the ica operon, is considered to be an important virulence factor in both S. epidermidis and S. aureus. However, the clinical impact of the ica locus and PIA production is less w...

conclusions the remarkable rates of biofilm production ability among clinically isolated staphylococci emphasize the necessity of more effective infections control policies to prevent biofilm formation on medical devices and hospital environmental surfaces. background biofilm formation capacity is recognized as an important virulence factor in staphylococci that makes the organisms more resista...

objective(s):bacterial biofilm has been considered responsible for many deaths and high health costs worldwide. their better protection against antibacterial agents compared to free living cells leads to poor treatment efficiency. nanotechnology is promising approach to combat biofilm infections. the aim of the present study was to eradicate staphylococcus epidermidis biofilm with silver nanopa...

the aim of this study was to evaluate the ability of 15 serotypes of salmonella to form biofilm on polystyrene, polyvinyl chloride (pvc) and glass surfaces. .initially slime production was assessed on cra agar and hydrophobicity of 20 salmonella strains isolated from poultry and human and two salmonella enterica serovar typhimurium references strains was achieved by microbial adhesion to n-hexa...

Bacterial biofilms are agglomeration of bacterial cells, stuck to the material surfaces in wet environments and formed by a self-produced matrix. The formation is great risk for milk processing industry, as survival many species cow may lead problems such microbial spoilage, deterioration quality, consumer health risks. This study aimed identify biofilm bacteria from milk. experiment included i...