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 119 for “"symbionts"”.
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Symbionts and immune defence in lepidopteran crop pests
… the prevalence and genetic diversity of symbionts with potential use for noctuid biocontrol such as densovirus, baculovirus and Wolbachia. Secondly, we identified that in non-infected individuals prophenoloxidase gene expression (a crucial enzyme of noctuid immune defence) did not vary …
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Robotic symbionts : exploring integrated human-machine action and expression
Throughout history we have augmented our physical abilities with machines. Concepts for flying machines and the ideas behind today's exoskeletons were recorded as early as the 13th century. Today, as technology permeates every aspect of our lives, it is easy to imagine a much closer integration of …
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Investigating physiological collaborations between a lower termite and its symbionts
… Lower-termites, like <em>R. flavipes, </em>house symbionts from all three domains of life within their hindgut paunch. This intimate association is reflected in nearly every aspect of termite biology. Here, I investigate these physiological collaborations as they relate to digestion and immunity. …
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Ecology and behaviour of burrowing prawns and their burrow symbionts
… and trophic functions (e.g. food) for burrow symbionts, however, the relative importance of these functions for symbionts is poorly understood. The behavioural interactions between burrowing engineers and their burrow symbionts are also poorly understood, mainly due to the difficulty in …
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Invasive Hosts and their Context Dependent Relationships with Native Symbionts
… symbiotic relationships by introducing invasive symbionts, reducing the population of native symbionts, or competing for native symbionts as a resource. There is an established symbiotic relationship between crayfish and annelid worms in the order Branchiobdellida. Branchiobdellidan worms can …
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Gut-associated microbial symbionts of the marsh fiddler crab, Uca pugnax
… In intermolt crabs, both bacterial and protozoan symbionts appear to be consistent features of the stomach and hindgut. Furthermore, bacterial diversity patterns seem to be comparable among individuals and over time, as assessed by denaturing gradient gel electrophoresis (DGGE). Community …
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Gut-associated microbial symbionts of the marsh fiddler crab, Uca pugnax
(cont.) bacterial phylotypes. An exception was the U. pugnax hindgut phylotype most closely related to a phylotype identified from hindguts of the detritivorous shrimp Neotrypaea califomiensis. This finding suggests that detritivorous crustacean hindguts may provide an ecological niche for specific …
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The Effects Of Clinorotation In The Host Plant, Medicago Truncatula, And Its Microbial Symbionts
The aim of this research was to understand mutualistic relationships between plants and endophytic microbes under the influence of an altered gravity vector. Understanding the outcome of the plant-microbe symbiosis in altered gravity is vital to developing life support systems for long distance …
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The effects of temperature on fungal symbionts in the mountain pine beetle-fungus multi-partite symbiosis
… the effects of temperature on the fungal symbionts, I collected 88 isolates from three locations in two states (50 G. clavigera and 38 O. montium) and measured their growth rates and sporulation at 5, 10, 15, 21, 25, 30, and 35˚C on artificial media. I also measured the growth rates of, …
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The effects of temperature on fungal symbionts in the mountain pine beetle-fungus multi-partite symbiosis
… the effects of temperature on the fungal symbionts, I collected 88 isolates from three locations in two states (50 G. clavigera and 38 O. montium) and measured their growth rates and sporulation at 5, 10, 15, 21, 25, 30, and 35˚C on artificial media. I also measured the growth rates of, …
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Partners in space: Discordant population structure between legume hosts and Rhizobium symbionts in their native range
… flow among sampling sites in these bacterial symbionts relative to host plants. Taken together our results suggest that the spatial structure of genetic variation is impacted differently by the environment in the host and in the three symbiont genomic elements. This could lead to differing …
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Analysis of the role of velvet and laeA in the molecular interactions between grass and Epichloë fungal symbionts
Epichloë species form agriculturally important symbioses with many cool season grasses. However, little is known about the molecular details of the interaction and the key regulatory systems involved. VelA and LaeA are two wellknown regulators of different fungal development and metabolic …
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Competition and co-existence of Photorhabdus temperata subspecies temperata and Photorhabdus temperata subspecies cinerea, symbionts of Heterorhabditis downesi
… nematode Heterorhabditis downesi and its two symbionts, Photorhabdus temperata subsp. temperata and P. temperata subsp. cinerea, and the relationship (co-existence and competition) between the two symbionts, which co occur on Bull Island in Dublin Bay. There was no effect of Photorhabdus …
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Investigation of the role of root flavonoids in the interaction of chickpea with nitrogen-fixing symbionts and parasitic nematodes
Legumes can get infected by both symbionts and parasites, often concurrently, in the field. Rhizobia (Mesorhizobium ciceri)-legume (Cicer arietinum) symbiosis and rhizobia-nematode (Meloidogyne javanica) parasitism are linked as there are commonalities during the early signal interaction between …
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Investigation of the role of root flavonoids in the interaction of chickpea with nitrogen-fixing symbionts and parasitic nematodes
Legumes can get infected by both symbionts and parasites, often concurrently, in the field. Rhizobia (Mesorhizobium ciceri)-legume (Cicer arietinum) symbiosis and rhizobia-nematode (Meloidogyne javanica) parasitism are linked as there are commonalities during the early signal interaction between …
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The Evolution of Symbiosis in Communities
All organisms host a menagerie of symbionts. While harmful pathogens have historically held the attention of researchers, recent technological advances have revealed a cornucopia of benign, and even beneficial, symbionts. Observations that most organisms are party to a wide variety of harmless …
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The ecology of colonial radiolarians : their colony morphology, trophic interactions and associations, behavior, distribution, and the photosynthesis of their symbionts
Colonial radiolarians (Spumellaria) are among the most common and abundant large zooplankton, but they have been little studied by modern biologists. Colonies were found on 98% of epipelagic diving stations in the period from 1977 to 1979. Measured abundances ranged from .04 to 540 colonies per m3. …
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Phylogeography of Oculina Corals and their Algal Symbionts: Insights into the Origin and Expansion of Oculina Patagonica in the Mediterranean
In a world of rapidly changing environmental conditions, species must effectively respond to their changing habitat or risk extinction. The goal of my dissertation is to elucidate the origins and mechanisms underlying the recent successful population expansion of the invasive coral Oculina …
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