tailieunhanh - Quorum sensing in gram negative bacteria

It has become increasingly and widely recognised that bacteria do not live as isolated entities but instead exist as communities that exploit elaborate systems of intercellular communication to facilitate their adaptation to changing environmental conditions. A well-characterised example of such intercellular communication is quorum sensing. | Turk J Biol 27 (2003) 85-93 © TÜB‹TAK Quorum Sensing in Gram-Negative Bacteria Gülgün BOfiGELMEZ-TINAZ Department of Biology, Faculty of Art and Sciences, Süleyman Demirel University, Isparta - TURKEY Received: Abstract: It has become increasingly and widely recognised that bacteria do not live as isolated entities but instead exist as communities that exploit elaborate systems of intercellular communication to facilitate their adaptation to changing environmental conditions. A well-characterised example of such intercellular communication is quorum sensing. Quorum sensing depends on the production of diffusible signal molecules termed autoinducers or pheromones, which enable a bacterium to monitor its own cell population density. A variety of physiological processes in a range of bacterial species is regulated by quorum sensing. Examples include bioluminescence, antibiotic biosynthesis, swarming, biofilm differentiation, conjugation and the production of virulence determinants in animal, fish and plant pathogens. The best studied common signalling molecules found in Gram-negative bacteria are N-acyl derivatives of homoserine lactone (acyl HSLs). In this paper, the current state of research concerning acyl HSL-mediated quorum sensing in Gram-negative bacteria is reviewed. Key Words: Quorum sensing, acyl homoserine lactones, bacterial signalling, gene expression Gram-Negatif Bakterilerde Çevreyi Alg›lama Özet: Bakterilerin izole varl›klar olarak yaflamad›klar›, de¤iflen ortam koflullar›na uyumlar›n› kolaylaflt›rmak için karmafl›k hücreler aras› haberleflme sistemleri kullanan toplukluklar halinde bulunduklar› giderek artan bir yayg›nl›kla kabul edilmektedir. Bu tip hücreler aras› haberleflmenin iyi karakterize edilmifl bir örne¤i, çevreyi alg›lamad›r. Çevreyi alg›lama, bir bakteriye kendi hücre populasyon yo¤unlu¤unu izlemesine olanak veren autoinducer veya feromon olarak adland›r›lan sinyal moleküllerinin üretimine ba¤›ml›d›r. De¤iflik bakteri .

• Sinh học
• Quorum sensing
• Acyl homoserine lactones
• Bacterial signalling
• Gene expression
• Gram negative bacteria
• Nosocomial pneumonia in stroke patients
• Antibiotic resistance characteristics of some gram negative bacteria
• The incidence of nosocomial pneumonia
• Antibiotic resistance of gram negative bacteria
• P
• aeruginosa resistance
• Antagonistic antibacterial effect
• Red betel combination against
• Gram positive
• Overcome bacterial resistance
• Pork salami stored
• Refrigeration temperature
• Electron beam irradiation on survival
• Selected gram positive
• Nonfermenting gram negative bacilli
• Pseudomonas aeruginosa
• Acinetobacter baumannii
• Respiratory tract infection admitted
• Nonfermenting gram negative bacteria
• Staphylococcus aureus
• Enterobacter spp isolates
• Silver nano particles
• Photo sensitizer
• Adhathoda vasica
• Antibacterial activity
• Zone of inhibition
• Adhatoda vasica various extracts against gram positive
• β Lactamase
• Extended spectrum β Lactamase
• Amp C β Lactamase resistance
• Gram negative bacterial isolates
• Ventilator associated pneumonia
• Antibiotic susceptibility
• Lower respiratory tract infection
• Aerobic gram negative bacilli
• Lower respiratory tract specimens
• Dong Nai river
• Antibiotic resistance
• Aquaculture activities
• Human health
• Nosocomial infection
• Gram negative non fermenting bacteria
• Resistant pattern
• Clinical isolates
• Rural population in South India
• Carbapenem resistant gram negative bacteria
• Paediatric ward
• Good infectious control practice
• Know the prevalence
• Management of treatment
• Elizabethkingia meningoseptica
• Medical intensive care units
• Fermentative gram negative bacteria
• Various clinical samples collected
• BMC Anesthesiology
• Nosocomial infections
• Including ICU acquired infections
• Gram positive bacteria
• Lecture AP Biology
• Systems biology
• Biological sciences
• Biological organization
• bệnh học và điều trị
• bài giảng bệnh học
• tài liệu y khoa
• Harrisons Internal Medicine
• Infections Due
• Miscellaneous Gram Negative Bacteria
• Prescotts microbiology
• Microbial metabolism
• Microbial molecular biology
• Microbial world
• Applied microbiology
• Nonproteobacterial gram negative bacteria
• Evolvulus nummularius
• MDR strains
• Growth curve
• Implication in antibacterial activity
• Increased ROS generation
• Antibiotic profile
• Molecular characterisation
• Carbapenem resistant non fermentative
• Risk factors associated
• Gram negative sepsis
• Concentrations of TNF α
• ELISA technique
• Predictive significance
• TNF α ratios
• Indoor air quality
• Medical laboratory
• Different disinfectants
• Lecture Biology