b a ckground: quorum-sensing systems regulate expression of several virulence factors in pseudomonas aeruginosa . this study investigated the relation between expression of the las quorum-sensing system and expression of mexy and ampc in35 clinical isolates of p. aeruginosa . m e t hods: antibiotic susceptibility was determined by the disc diffusion method according to the clinical and laborato...

bacteria use a chemical language to communicate with each other which enables them to synchronize gene expression as a result of cell density. this special language which is called quorum sensing (qs) is based on producing and sensing the small signals and eventually leads them to perceive when a minimum population unit is reached. on the contrary, quorum sensing blockade (quorum quenching) has...

Objective(s): Honey’s ability to kill microorganisms and even eradication of chronic infections with drug-resistant pathogens has been documented by numerous studies. The present study is focused on the action of honey in its sub-inhibitory levels to impact on the pathogens coordinated behaviors rather than killing them. Materials and Methods:</strong...

In distributed systems, data replication provides better availability, higher read capacity, improved access efficiency and lower bandwidth requirements in the system. In this paper, we propose a significantly efficient approach of the data replication for serial isolation by using newly proposed Circular quorum systems. This paper has three major contributions. First, we have proposed the Circ...

This paper presents a new atomic commitment protocol, Enhanced Three Phase Commit (E3PC), that always allows a quorum in the system to make progress. Previously suggested quorum-based protocols (e.g. the quorum-based Three Phase Commit (3PC) Ske82]) allow a quorum to make progress in case of one failure. If failures cascade, however, and the quorum in the system is \lost" (i.e. at a given time ...

With the emergence of antibiotic-resistant strains of bacteria, the available options for treating bacterial infections have become very limited, and the search for a novel general antibacterial therapy has received much greater attention. Quorum quenching can be used to control disease in a quorum sensing system by triggering the pathogenic phenotype. The interference with the quorum sensing s...

This paper presents a new atomic commitment protocol enhanced three phase commit E PC that always allows a quorum in the system to make progress Previously suggested quorum based protocols e g the quorum based three phase commit PC Ske allow a quorum to make progress in case of one failure If failures cascade however and the quorum in the system is lost i e at a given time no quorum component e...

The FPP, grid, cyclic, torus and e-torus quorum systems satisfy the rotation closure property and have the optimal or near optimal quorum sizes. They can be used to achieve asynchronous power-saving algorithms in mobile ad hoc networks with the lowest or near lowest active ratios. The algorithms guarantee that a node receives one or more beacons from every neighboring node within a round of bea...

A quorum system is a set system in which any two subsets have nonempty intersection. Quorum systems have been extensively studied as a method of maintaining consistency in distributed systems. Important attributes of a quorum system include the load, balancing ratio, rank (i.e., quorum size) and availability. Many constructions have been presented in the literature for quorum systems in which t...