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 179 for “"defences"”.
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Seaweed Invasions and Novel Chemical Defences
… suggested that introduced species with chemical defences that are novel to native herbivores in the new range are most likely to become successful invaders. The scope of this thesis was to investigate ecological processes that underlie the successful invasion of plant/seaweed species and how …
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Streptococcus pyogenes - a manipulator of human defences
Streptococcus pyogenes is a major human pathogen with more than 500 000 casualties annually of which at least 163 000 are due to invasive infections. The remainder is due to post-streptococcal complications with rheu¬matic heart disease constituting the majority. S. pyogenes also causes milder …
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Guidelines on advance defences to hostile take-overs
Take-overs A take-over involves a change of control of a company.1 This occurs when the , existing shareholders of a target (or offeree) company transfer sufficient shares to an offeror so as to give to the offeror control of the voting power attaching to the target company's share cap~tal.2 This …
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Probabilistic deterioration modelling and time-dependent reliability analysis of coastal defences
… The main failure mechanisms in coastal flood defences, e.g. wave overtopping and piping will be affected due to the change in hydraulic parameters and deterioration processes, which may decrease the reliability of the structures. Also, the uncertainties arising from the mentioned problems lead …
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Quantifying Acacia defences : understanding the role of hooks, spines and architecture
The effectiveness of the structural defences of Acacias vary within and between species as a result of differences in thorn type (hooks versus spines) and branching architecture. This study aims to develop methods for quantifying the effectiveness of defences, thereby allowing for comparisons …
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Unravelling multidimensions of the flora of Kenya floristics, herbivory defences, and phylogenetic diversity
The wealth of plants in the vegetation of Kenya, owing to the country's wide range of climatic and ecological regions, can be complex and hence defies easy definition. This thesis, consisting of a literature review, four data chapters and a synthesis, addresses multiple aspects of that vegetation, …
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Modulation of macrophage and epithelial cell immune defences by probiotic bacteria: immune stimulation versus suppression
Abstract Probiotic bacteria are live organisms, if consumed in adequate amounts might confer health benefits. These bacteria, such as Lactic acid bacteria (LAB), include a number of strains that have specific health promoting activi-ties, attributed to their immunomodulatory and anti-inflammatory …
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An investigation into marine biofouling and its influence on the durability of concrete sea defences
… its influence on the durability of concrete sea defences using on-site and laboratory-based studies. The study was divided into three main phases namely: the surface analysis of armour concrete, the study of algal colonisation within the matrix and investigations into the presence of a bacterial …
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Soft cliff retreat adjacent to coastal defences, with particular reference to Holderness and Christchurch Bay, UK
Coastal defences reduce sediment input and modify the sediment budget, usually resulting in a sediment deficit down-drift and an accumulation up-drift. This process results in set-back adjacent to defences. Three types of set-back were identified and these occur due to the:<br/><br/>• terminal …
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Assessing the ecological vulnerability of natural flood defences and risks to agricultural land following seawater flooding
… resilience and allow enhancement of nature-based defences. <br/>
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Pathological vs non-pathological incapacity: are the differences in requirements and consequences justified?
This paper covers the criminal law defences of pathological incapacity and non-pathological incapacity in South African law which are used by defendants in criminal cases to refute the element of capacity that is necessary for the court to hold the accused criminally liable. Each defence has its …
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The Curiosity that is Curiosity: A Psychoanalytic Conceptual-Clinical Study
… it is possible to identify and operationalise defences against it. My approach is based on a model in which curiosity is a dimension of separation. It is a result of integration, of the conflux of several lines of development and as such it is tolerant of separation, but there is an …
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A Physicochemical and Biophysical Investigation into the Role of Lysyl- Phosphatidylglycerol in the Membrane of Staphylococcus aureus under mild acidic conditions
… human epithelia despite the presence of innate defences including mild acidity and cationic antimicrobial peptides (CAMPs). Reduced sensitivity of S. aureus to these defences appears partly due to the increased biosynthesis of lysyl-phosphatidylglycerol (L-PG) in its plasma membrane. The precise …
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Cigarette smoke and human pulmonary immune responses to mycobacteria
… has a significant effect upon innate host defences. Significant reductions in the production of key cytokines implicated in defences against mycobacteria were observed, not attributable to impairment of mycobacterial uptake by cigarette smoke extract exposure. Furthermore, control of …
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Morphological antipredator adaptations in water fleas
… to develop extreme morphological antipredator defences, such as long antennules, high carapaces and helmets. The relative sizes of these plastic traits may differ substantially between populations, and also between individuals within a population, between sexes and during ontogeny. In this …
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Just joking: jest as a defence to defamation
… to the element of defamatoriness and the defences to an action for defamation. It argues that superiority humour, which is funny because it belittles the plaintiff, is being unduly curtailed by the courts' erroneous application of a flawed test for defamatoriness based on the plaintiff's …
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The role of local and peripheral antioxidants in the pathogenesis of chronic Periodontitis in smokers
… ROS production is the depletion of antioxidant defences against ROS within the periodontal pockets. Cigarette smoke is also reported to increase the oxidative burden and deplete antioxidant defences, but no data are available on gingival crevicular (GCF) antioxidant levels in smokers compared to …
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