Quorum sensing controls the luminescence of Vibrio fischeri through the transcriptional activator LuxR and the specific autoinducer signal produced by luxI. Amino acid sequences of these two genes were analyzed using bioinformatics tools. LuxI consists of 193 amino acids and appears to contain five α-helices and six ß-sheets when analyzed by SSpro8. LuxI belongs to the autoinducer synthetase fa...

Although the study of microbe-host interactions has been traditionally dominated by an interest in pathogenic associations, there is an increasing awareness of the importance of cooperative symbiotic interactions in the biology of many bacteria and their animal and plant hosts. This review examines a model system for the study of such symbioses, the light organ association between the bobtail s...

Two novel marine luminous bacteria, LC2-047T and LC1-908, were isolated from seawater in Sagami Bay in Japan and an equatorial area, respectively. The cells are Gram-negative, rod shaped and motile with one polar flagellum. These bacteria are oxidase-positive and catalase-positive, and are able to grow in 0.5‒6% NaCl (optimum 3‒5%) and at temperatures of 10‒37°C (optimum 25‒30°C). Phylogenetic ...

Bu çalışmada Konya’da bulunan yatak kapasiteleri 27-600 kişi arasında değişen 10 hastanenin atıksuyundan yaz ve kış dönemlerinde örnekler alınarak fizikokimyasal özellikleri belirlenmiş Vibrio fischeri, Daphnia magna, Lepidium sativum toksisite testleri ile ekotoksikolojik etkisi belirlenmiştir. Hastane atıksularının pH, elektriksel iletkenlik, askıda katı madde toplam organik karbon parametrel...

Irradiation of polycyclic aromatic hydrocarbons (PAHs) in aqueous solution with simulated solar radiation (SSR; a light source with a visible light: UV-A:UV-B ratio similar to that of sunlight) can greatly enhance their toxicity. Two microbial toxicity tests with Vibrio fischeri were used to investigate the effect of composition of the growth medium and pre-incubation on the photoinduced toxici...

Robust biofilm formation by Vibrio fischeri depends upon activation of the symbiosis polysaccharide (syp) locus, which is achieved by overexpressing the RscS sensor kinase (RscS(+)). Other than the Syp polysaccharide, however, little is known about V. fischeri biofilm matrix components. In other bacteria, biofilms contain polysaccharides, secreted proteins, and outer membrane vesicles (OMVs). H...