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 14 of 14 for “"chemical defence"”.
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Chemical defence in the red-billed wood hoopoe : phoeniculus purpureus
… odour and the role that the secretion plays. The chemical analysis of this secretion shows that it consists of 17 compounds including acids, aldehydes, lactones and other miscellaneous compounds. Cultures of the secretion showed the presence of a symbiotic bacterium resident within the gland. …
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In defence of flowers: The ecology and biochemistry of a chemical defence, cyanogenesis, in Proteaceae
… plants produce a remarkable diversity of chemicals to defend their tissues against herbivory. The large body of research into plant defences has primarily focused on plant-herbivore interactions and foliar defences, whereas floral chemical defences have received little attention. This is …
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Local Variation in the Chemical Defence of European Pine Sawfly (Neodiprion sertifer): Effects of Host Tree Chemistry and Social Environment
Chemical defences are diverse in nature, and this variation can be adaptive or non-adaptive (i.e., environmental noise). Identifying the sources for this variation helps to understand ecosystem interactions and, to make more accurate predictions of species distributions and local abundances. The …
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The search for a novel toxicant in Gastrolobium (Fabaceae : Mirbelieae) seed historically associated with toxic native fauna / David E. Peacock.
… be to provide the reintroduced animals with a chemical defence, making them toxic to the predating fox or cat. This thesis describes the analysis of Gastrolobium seed for possible toxicants which could potentially provide chemical defence compounds for reintroduced fauna.
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Immunohistochemical localisation of caffeine in young tea (Camellia sinensis (L.) O. Kuntze) leaves
… It is hypothesized that the molecule acts as a chemical defence as well as an aid in the sequestration of catechins and polyphenols within the vacuoles of parenchyma cells. Different methods of decaffeination exist using solvents such as methylene chloride, supercritical CO2, and using hot …
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QUB-2614: a bioactive peptide from the defensive skin secretion of Odorrana schmackeri
… role in their daily life as a method of chemical defence. In recent biomedical research studies, these secretions have been shown to contain biologically-active compounds, such as anti-microbial peptides (AMPs) and anticancer peptides (ACPs), which are used by biomedical researchers as a …
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The determination of trace metals in mixed matrices
… and Pb in buffer reagent solution, employed in chemical detector systems, have been carried out by employing the technique of electrothermal atomization - atomic absorption spectrometry (ETA-AAS). Various experimental parameters have been optimized and procedures developed for the relevant …
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Biologically active molecules from marine microalgae
… of aldehydes is species-specific. Detailed chemical analysis revealed the presence of fatty acid derivatives other than aldehydes such as hydroxyacids, ketoacids, oxoacids and epoxyalcohols, increasing the complexity of a chemical defence of diatoms mediated only by aldehydes. All these …
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Ethics, ecology and evolution of Indonesian slow lorises (Nycticebus spp.) rescued from the pet trade
… loris face masks in relation to antipredator defence. I conclude that the pelage colours recorded have probably evolved for maximum signalling effect. When combined with the slow lorises' chemical defence mechanism I propose that the distinctive facemasks in slow lorises could serve as a form …
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The effect of light-limitation on spinescent structural defence and its implications on resistance to herbivory in the shade
… resist herbivore pressure through structural or chemical defence or both. The ultimate goal of defence against herbivory is to reduce the amount of damage to biomass, but more specifically to protect against damage to meristematic tissue. The defences employed depend on the type of herbivory …
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Herbivore-plant-soil interactions in the boreal forest : selective winter feeding by spruce grouse
… needles from feeding trees over control trees. Chemical analyses of needles also support the hypothesis that needle chemistry accounts for the winter forage selection of spruce grouse. Concentrations of two monoterpene antifeedants, camphor and bornyl acetate, and the ratio of resin to nitrogen, …
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Exocrine glands in Erotylidae (Coleoptera, Cucujoidea): chemical ecology, morphology and evolution
In most insect orders chemical defence is highly important and a multiplicity of partly spectacular defence mechanisms were described in the last years. It is well known that members of the Erotylidae show a particularly rich equipment of exocrine compound glands. However, morphology and …
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Predators vs. Prey: The information ecology of warning signals
… (personal information) to learn about these defences, however recent research suggests that observing predation events of others (social information) may also shape selection for prey defences and help resolve this puzzle. Here I use great tits and blue tits as model predators to investigate …