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 20 of 38 for “"Endosymbiont"”.
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Controls on nitrogen fixation and nitrogen release in a diazotrophic endosymbiont of shipworms
Nitrogen fixation is an ecologically important microbial process that can contribute bioavailable combined N to habitats low in N. Shipworms, or wood-boring bivalves, host N2-fixing and cellulolytic symbiotic bacteria in gill bacteriocytes, which have been implicated as a necessary adaptation to an …
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Genotypic and endosymbiont-mediated variation in parasitoid susceptibility and other fitness traits of the potato aphid, <em>Macrosiphum euphorbiae</em>
… all aphid species harbour the primary bacterial endosymbiont <br/> <em>Buchnera aphidicola</em>, which plays a vital role in essential nutrient provisioning. In the last two decades several additional ‘secondary’ bacterial endosymbionts have been detected across different aphid species, although …
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The Dynamics of Natural Enemy Resistance in Aphid Populations
Many aphids harbour facultative bacterial endosymbionts that can influence aphid fitness. In Acyrthosiphon pisum (the pea aphid), the endosymbiont <i>Hamiltonella defensa</i> confers resistance to parasitism by parasitoid wasps due to the presence of the APSE bacteriophage in the …
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Carbon cycling in the Caribbean reef-building coral Orbicella: quantitative evidence for enzymatic control of skeletal density banding and coral-endosymbiont physiological plasticity during seasonal environmental change
… light-capture by the coral’s photosynthetic endosymbiont, the unicellular dinoflagellate zooxanthellae. Quantitative image analyses show that both the cellular density of zooxanthellae and the density of the chromatophores change according to positioning on the reef tract, and therefore …
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Super-Organismal Effects Of A Widespread Insect Endosymbiotic Bacteria
… such as ants. Wolbachia, a maternally-inherited endosymbiont, is the most widespread insect endosymbiont. It manipulates host reproduction and confers fitness benefits to the host to favor its own vertical transmission. While Wolbachia is known to manipulate the reproductive biology of their …
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Biochemical and cell biological studies of cytoplasmic incompatibility in Drosophila
… been linked to the presence of a Rickettsia-like endosymbiont inhabiting the gonads of infected animals. Though originally discovered in mosquitoes, CI has now been observed in a diverse array of insects including mosquitoes (Aedes group), beetles (Tribolium confusum), moths (Ephestia cautella), …
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Exploring the Role of Wolbachia Endobacteria in the Biology of Filarial Nematode Parasites
… species are able to survive in the absence of an endosymbiont. The inconsistent patterns of <italic>Wolbachia</italic>-dependence and independence seen in filarial nematodes may be explained by two hypotheses. Following infection with the endobacteria, reductive evolution could have removed …
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A study of the super-abundant Bemisia tabaci (Gennadius) species complex (Hemiptera: Aleyrodidae) in cassava mosaic disease pandemic areas in Tanzania
… of cassava-associated B. tabaci, to assess the endosymbiont fauna, and to investigate the population structure of B. tabaci populations found in Tanzania. Hence, whiteflies collected through several field surveys were analysed using mitochondrial and nuclear markers. The four B. tabaci putative …
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Habitat and Ecological Observations on Gymnodinium Acidotum Nygaard, a Colorless Dinoflagellate Phagocytizing Blue-Green Cryptophytes
… a rare dinoflagellate harboring a cryptomonad endosymbiont, was implicated in a fish kill in open waters of Stockton Lake, MO. In 1987. Collections from 1989 have shown that G. acidotum is normally associated with Spirogyra sp. in the benthos of shallow marshy areas frequented by waterfowl. …
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The nutritional role of endosymbiotic bacteria in animal-bacteria symbioses : Solemya velum, a case study
… symbioses were investigated using the endosymbiont-containing protobranch clam, Solemya velum, as a general model. C, N, and S stable isotope compositions were investigated in tissues of S. velum; C and N isotope values were also examined in an enriched bacterial fraction, separated …
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Host-Microbe Relations: A Phylogenomics-Driven Bioinformatic Approach to the Characterization of Microbial DNA from Heterogeneous Sequence Data
… study, the genomic sequences of a single, known endosymbiont was extracted from the genome sequencing data of its host. In the second study, a highly divergent endosymbiont was characterized from the assembled genome of its host. In the third study, genome sequences from a novel bacterium were …
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Bioinformatics and Next Generation Sequencing: Applications of Arthropod Genomes
… flat mite genomes and their corresponding endosymbiont Cardinium genomes. Comparative genomics reveals herbivorous pest adaptations and parthenogenesis; (3) the complete genomic analysis of parasitoid wasp Copidosoma floridanum indicates the mechanism of polyembryony of such primary …
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Lokalisierung und molekulare Charakterisierung eines Pederin produzierenden Endosymbionten der Gattung Pseudomonas aus dem Kurzflügler Paederus riparius(Coleoptera: Staphylinidae)
… mit Pseudomonas aeruginosa sehr nahe verwandten Endosymbionten, der für die Synthese des stark cytotoxischen Naturstoffs Pederin verantwortlich ist. Die ökologische Bedeutung dieses Giftstoffs für die Käfer liegt dabei offenbar in einer Abwehrfunktion gegenüber potentiellen Prädatoren, wie z. B. …
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Haemophilus influenzae as a chassis for directed endosymbiosis
… make it attractive for engineering bacterial endosymbionts. First, H. influenzae strains lacking the restriction endonuclease genes HindIIR and HindIIIR were shown to transform more efficiently by electroporation than wild-type. A pSU20-derived plasmid series was then developed to provide …
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An Insight Into the Microbial Diversity and Expression of Cysteine Protease Inhibitors (Cystatin) in <i>Rickettsia parkeri</i> Infected <i>Amblyomma maculatum</i>
… <em>R. parkeri, R. amblyommii, </em>and <em>R. endosymbiont of A. maculatum.</em> While only <em>R. parkeri</em> was detected in female salivary glands which suggest its ability to traffic from midgut to salivary glands via hemocoel. The presence of <em>R. parkeri</em> was further confirmed by …
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Establishing Sodalis species as a laboratory model of endosymbionts
… and Sodalis. Sodalis glossinidius – a secondary endosymbiont - is interesting as sequencing of its genome suggests S. glossinidius has undergone less genome reduction than its primary symbiont counterparts such as Wigglesworthia, and therefore has a more recent association with its host than the …
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De novo assembly of transcriptome and genome data from the Asia I mtCOI genetic clade of Bemisia tabaci
… tabaci Asia I genome, one mitogenome and three endosymbiont genomes representing Portiera, Wolbachia and Arsenophonus were obtained from the same sequence library. The development of a genetic framework is described as a side-project which uses Drosophila essential genes as a reference to …
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EVOLUTIONARY AND MECHANISTIC INTERACTIONS IN VIRUS TRANSMISSION BY APHIDS
… vectors, plant viruses and the aphid’s bacterial endosymbiont. In this interaction, plant hosts activate their immune defenses against plant viruses and aphids and the latter two use a myriad of strategies to overcome, counteract or skip the host plant defense, which sometimes is done in …
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Haem and xenosiderophore mediated iron acquisition by sinorhizobium meliloti and pseudomonas aeruginosa
… acquisition. Sinorhizobium meliloti 2011, the endosymbiont of Medicago sativa, is capable of utilising several xenosiderophores and the haem compounds haemoglobin and haemin to overcome conditions of iron limitation. The high demand for iron in the nodule makes the study of S. meliloti 2011 …
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The Prevalence and Effect of Wolbachia Infection on the Brown Widow Spider (Latrodectus Geometricus)
… dynamics are unknown. The frequency of endosymbiont infection can provide insight into the population dynamics of the host as this bacteria is known to alter host life history. In my 1<sup>st</sup> chapter I determine the prevalence of <em>Wolbachia pipentis</em> infection in in the …
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