2-Heptyl-3-hydroxy-4-quinolone, known as the Pseudomonas Quinolone Signal, is a key regulator of bacterial cooperative behaviour known as quorum sensing. A simple electrochemical strategy was employed for its sensitive detection using a bare boron-doped diamond electrode by cyclic voltammetry and amperometry. PQS (and potentially other quinolones) was then detected in cultures of P. aeruginosa ...

AIM To evaluate the reliability of pronator quadratus fat pad sign to detect distal radius fracture and to predict its severity. METHODS Retrospectively we identified 89 consecutive patients (41 female, mean age 49 ± 18 years) who had X-ray (CR) and computed tomography (CT) within 24 h following distal forearm trauma. Thickness of pronator quadratus fat pad complex (PQC) was measured using la...

Asking the Right Questions “Probing for Requirements Knowledge to Stimulate Architectural Thinking,” by Preethu Anish and her colleagues, describes an inexpensive, down-to-earth requirements elicitation technique to ensure that software requirement speci cations (SRSs) contain architecturally relevant information.1 This research aims to equip business analysts with the appropriate probing quest...

Liouville-type theorems are powerful tools in partial differential equations. Boundedness assumption of solutions are often imposed in deriving such Liouville-type theorems. In this paper, we establish some Liouville-type theorems without the boundedness assumption of nonnegative solutions to certain classes of elliptic equations and systems. Using a rescaling technique and doubling lemma devel...

Cystic fibrosis (CF) is a hereditary disease that predisposes individuals to pulmonary dysfunction and chronic infections. Early infection of the CF lung with Staphylococcus aureus is common, while Pseudomonas aeruginosa becomes dominant as disease progresses. Emergence of P. aeruginosa likely depends on the action of multiple 2-alkyl-4-(1H)-quinolones (AQ) secreted by this organism. We recentl...

In this paper we use traffic analysis to investigate a stealthy form of data exfiltration. We present an approach to detect covert channels based on a Process Query System (PQS), a new type of information retrieval technology in which queries are expressed as process descriptions.

Bacteria produce a wide variety of exoproducts that favourably modify their environment and increase their fitness. These are often termed 'public goods' because they are costly for individuals to produce and can be exploited by non-producers (cheats). The outcome of conflict over public goods is dependent upon the prevailing environment and the phenotype of the individuals in competition. Many...

Bacteria use cell to communication system called quorum sensing (QS) share information about density and adjust gene expression accordingly. Processes controlled by QS include biofilm formation, virulence factor secretion swarming, responsible for bacteria harmful on the skin. Here we observed of two opportunistic skin bacteria: S. aureus (Sa) P. aeruginosa (Pa). Sa strongly disturbs barrier fu...