Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 18 of 18 for “"signal molecules"”.
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ROLE FOR HYDROGEN PEROXIDE DURING ABIOTIC AND BIOTIC STRESS SIGNALING IN PLANTS
… (H2O2), are now also considered to be important signal molecules that regulate the defense response of plants to stress. In this thesis, different strategies were pursued to identify genes that are involved in the stress response of plants.
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Synthesis and biological research of the pseudomonas aeruginosa signaling compounds PQS and N-3-oxo-dodecanoyl-L-homoserine lactone
… chronic infections, the Pseudomonas aeruginosa signaling molecules 3-oxo-C12-homoserine lactone and Pseudomonas quinolone signal were synthesized so that the mammalian cellular responses to their presence via an infection could be studied. It was hypothesized that differing combinations of the …
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Stress responses of the marine diatom <i>Skeletonema</i> spp. to polyunsaturated aldehydes (PUAS)
… of closeby phytoplankton species, and also as signal molecules to determine the cell fate of diatom populations. <br></br><br></br>The work presented here focuses on Nitric Oxide (NO) and Reactive Oxygen Species (ROS) production in response to PUAs in <i>Skeletonema marinoi</i>, a cosmopolitan, …
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Studying the Competence Regulon Quorum Sensing Circuity in Streptococcus mitis
… QS bacteria generate and release chemical signal molecules known as autoinducers, which increase in concentration as cell density increases. To determine the cell density and initiate the group behaviors such as virulence factor production, biofilm formation, and competence development …
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Approaches Towards the Synthesis of Bradyoxetin
… sensing bacteria produce and release chemical signal molecules (like N-acyl homoserine lactones, AHL) that increase in concentration as a function of cell density. The responses cover a large spectrum of process such as the virulence in Staphylococcus aureus, competence for DNA-uptake in …
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Central vasopressin signalling and aggressive behaviour
Although many signalling molecules appear relevant to the production of complex behaviours, those that are important to the physiological regulation of behaviour, and so those that characterise individual styles of behaviour, are unknown. Vasopressin is the strongest candidate regulator of social …
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Comparative and Functional Genomic Studies of Histophilus somni (Haemophilus somnus)
… complement biosynthesis of AI-2 quorum sensing signal molecules in Escherichia coli DH5alpha. It was also found that several pathogenic isolates of H. somni form a prominent biofilm and that luxS as well as phosphorylcholine expression can influence biofilm formation by H. somni. In conclusion, …
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Impacts of ocean acidification on fitness and chemical communication in a model marine invertebrate, Nereis succinea
… may occur via pH driven conformational change in signal molecules and/or protein receptors, reducing receptor-ligand interactions. As the chemical sense is dominant in ocean environments, any reduction in its efficiency will likely have negative implications for the survival of marine organisms. …
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The role of bacterial interspecies communication in polymicrobial infection of the cystic fibrosis lung
… maltophilia. These latter bacteria produce signal molecules of the diffusible signal factor (DSF) family, which are cis-2-unsaturated fatty acids. Previous studies showed that DSF from S. maltophilia leads to altered biofilm formation and increased tolerance to antibiotics in P. aeruginosa …
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Adsorption of phloretin to lipid layers
… of natural membranes for neutral and charged molecules, such as urea, glucose and chloride has been characterized 25 years ago. In contrast to signal molecules with primary effects on transport systems of natural membranes, phloretin also affects model membranes, i.e., artificial membranes, …
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The quorum-sensing regulation of Vibrio fischeri : novel components of the autoinducer/LuxR regulatory circuit
… fischeri two intercellular homoserine-Iactone signal molecules (luxI-dependent 30C6-HSL and the ainS-dependent C8-HSL) and the transcriptional activator LuxR regulate the luminescence system in a cell-density dependent manner by a process termed quorum sensing. In this study, five additional …
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Molecular signalling in Lupinus albus-Rhizobium lupini symbiosis
… takes place. In these associations, molecular signals such as flavonoids (or non-flavonoid type), nod gene-inducers, and bacterial lipochitooligosaccharides (LCOs) are known to act as modulators of species-specificity in the early stages of infection. Of the several known Rhizobium -legume …
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Engineering Redox-based Intercellular Communication Channels Towards the Control of Microbial Consortial Behavior
… wherein precisely encoded electronic signals can be used to elicit a programmed response. Moreover, electrogenetic induction schemes can be coupled with natural intercellular communication pathways (eg. quorum sensing), taking advantage of nature's diversity to increase signaling …
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Pectin: New insights from an old polymer through pectinase-based genetic screens
… oligosaccharides have been postulated to be signal molecules involved in plant pathogen defense mechanisms. Indeed, C24 showed elevated accumulation of reactive oxygen species upon pectinase elicitation and had altered response to the pathogen Alternaria brassicicola in comparison to Col-0. …
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Functional study of miRNA-mRNA interactions in malaria mosquito An. gambiae
… gene expression and coordinated by many signal molecules in the mosquito. Understanding gene regulation affecting mosquito reproduction and malaria parasites infection is of paramount importance for developing novel malaria control strategies. A growing body of evidence indicates that …