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 233 for “"desiccation"”.
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Investigation of desiccation cracks in drying soil
This research investigates desiccation cracking behaviour of a fill material from a flood embankment along the Bengawan Solo River in East Java, Indonesia, an area that is prone to extremes in flooding and drying. A detailed study of the previous works on this topic showed the absence of …
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Metabolomics of desiccation tolerance in Xerophyta humilis
… understanding of the phenomenon of vegetative desiccation tolerance will require a systems view of these adaptations at the levels of the genome, the control of gene expression, and the control of metabolic pathways. This dissertation reports a high-throughput metabolomic analysis of the …
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Moderately-rapid assessment of alkaline desiccation environmental systems
… tool was developed to analyze the waterless desiccation compost toilet investigated in a rural Mexican setting. Over 100 social factors were identified along with the applicable technical factors that influenced the low acceptability of the toilets. A 4-point rating scale was developed to …
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Fluorescence Studies of Photosystem II Fluorescence Quenching During Desiccation
… their photosynthetic machinery during times of desiccation. In hydrated conditions nonphotochemical quenching (NPQ) mechanisms are able to safely dissipate excess excitation energy as heat, but mechanisms of NPQ associated with desiccation tolerance are still largely unclear. In the lichen …
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Regulation of desiccation tolerance in Xerophyta seedlings and leaves
… known as resurrection plants display vegetative desiccation tolerance and can survive loss of up to 95% of cellular water, a feat only seen in the seeds and pollen of other angiosperms. Xerophyta humilis is a resurrection plant native to Southern Africa that has been the target of previous …
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Metabolite profiling of Eragrostis nindensis during desiccation and recovery
… into how different parts of the plant deal with desiccation. This study aimed to identify the different metabolites that are differentially abundant in Eragrostis nindensis at different stages of dehydration and rehydration time points in both desiccation-sensitive senescent (ST) and …
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Characterisation of two desiccation-linked dehydrins from Xerophyta humilis
… that were expressed during dehydration in the desiccation tolerant plant, Xerophyta humilis. From a transcriptome analyses on X. humilis, cDNA for the two dehydrins were obtained. These sequences were first analysed using various in silico tools in order to identify putative dehydrin-specific …
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Influence of desiccation fissuring on the stability of flood embankments
… and Marsland for the 1953 North Sea Floods that desiccation fissuring of clay fill can play a major role in the failure of flood embankments under overflow conditions. However, very little scientific research has been carried out into the onset of desiccation fissuring in flood embankments and …
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The dynamics of crack patterns in soil induced by desiccation
Many soil types develop cracks due to desiccation. The resulting crack patterns were simulated with the help of a network of springs, representing the breaking material. A spring breaks if the tensile stress on it exceeds a threshold. Based on existing models in the literature a numerical model was …
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Eragrostis nindensis: unravelling senescence in an African desiccation tolerant grass
… senescence. In this thesis the African desiccation tolerant grass Eragrostis nindensis (Fical & Hiern) was used as a model plant to identify which biological processes are unique to senescence and critical for desiccation tolerance. When desiccated, the older leaves of E. nindensis …
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Molecular Biology of Desiccation Tolerance in the Cyanobacterium Nostoc commune
The molecular biology of desiccation tolerance was investigated in the cyanobacteria with emphasis on Nostoc commune. Analysis of DNA from 41 samples of desiccated Nostoc spp. of varied age and global distribution led to the amplification of 43 independent tRNALEU(UAA) group 1 intron sequences. …
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Characterization of polyphenols in leaves of four desiccation tolerant plant families
… in southern Africa and called resurrection (desiccation tolerant) plants were studied. These plants are Myrothamnus flabellifolius, Xerophyta viscosa, Xerophyta humilis, Xerophyta schlecterii, Xerophyta villosa. Craterostigma wilmsii, Craterostigma plantagineum, Craterostigma pumilum and …
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Physiological and Biochemical Response of Saccharomyces cerevisiae to Desiccation and Rehydration
… rearrangements in order to survive cycles of desiccation and rehydration, yet a firm understanding of the response is lacking. The purpose of this study was to examine the response of S. cerevisiae to desiccation and rehydration at both the physiological and molecular levels. Transmission …
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Desiccation-driven senescence in the resurrection plant Xerophyta schlechteri (Baker) N.L. Menezes
… resurrection plants display vegetative desiccation tolerance and avoid drought-induced senescence in most of their tissues. Developmentally older tissues, however, fail to recover during rehydration and ultimately senesce. Comparison of the desiccation-associated responses of older …
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Cell wall involvement in desiccation tolerance in the resurrection plant Craterostigma wilmsii
… from an air-dried state. In order to cope with desiccation, resurrection plants have to overcome a number of stresses, mechanical stress being one. This occurs when the cytoplasm shrinks creating tension between the plasma membrane and the cell wall. In leaves of the Craterostigma species, an …
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In vitro tissue culture: Towards conservation of threatened desiccation sensitive Encephalartos cycads seeds
… for conserving cycad germplasm and banking these desiccation-sensitive seeds has made some advances, cycad conservation is still limited to ex situ living plant collections. In vitro tissue culture is a promising technique for conserving cycads. While attempts have been made, there have been few …
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Investigating the role of phytohormones during desiccation in two evolutionarily distinct resurrection plants
… processes that occur in the context of differing desiccation tolerance strategies, namely homoiochlorophylly and poikilochlorophylly. Hormone profiles were then followed up with gene expression analysis of desiccation-responsive genes RD29B and GASA3 in C. pumilum to further explore hormone …
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Investigating the mechanisms of desiccation tolerance in the resurrection plant, myrothamnus flabellifolius (WELW)
… plant and thus retains chlorophyll during desiccation. The mechanisms whereby this plant prevents photo-oxidation damage are not known and thus one of the objectives of this study was to characterise the chloroplasts and the changes they undergo during dehydration. It was shown that …
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Towards an understanding of the mechanisms of desiccation tolerance in Myrothamnus flabellifolius (WELW.)
… most of the studies on the homoiochlorophyllous desiccation-tolerant (HDT) plant Myrothamnus flabellifolius have been conducted on excised twigs or leaves. In this study drying (including prolonged exposure to the dry state), and recovery of whole plants was compared with that of detached twigs …
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The transcriptome response of leaves of the resurrection plant, Xerophyta humilis to desiccation
In angiosperms, desiccation tolerance, a genetic trait that enables tissues to survive loss of more than 95% of cellular water is widely observed in the seeds, but is only found in the vegetative tissues of a small group of species known as the resurrection plants. Xerophyta humilis is a small …
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