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 56 for “"Recalcitrance"”.
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Reducing cell wall recalcitrance in poplar through overexpression of cell wall degrading enzymes
<p>Abundant cellulose in the secondary cell walls of lignocellulosic biomass provides an alternative source of carbohydrates for ethanol production. However, low efficiency and high cost of conversion of cellulose to glucose prevents the large-scale production of economically viable cellulosic …
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A novel system to study seed recalcitrance and dormancy - comparative proteomics between two Spartina species
… the following three aspects of S. alterniflora: recalcitrance, dormancy release by cold stratification and the effect of drying temperature on the critical water content. Comparative proteomics between S. alterniflora and orthodox, desiccation tolerant Spartina pectinata seeds identified 83 …
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Molecular interactions of plant cell wall polymers
… acid branches of xylan are crucial to the recalcitrance of lignocellulose to enzymatic digestion. In this thesis the molecular basis of this change in recalcitrance was investigated. The gux1 gux2 mutant, which lacks glucuronic acid in secondary cell walls, was found to be more accessible …
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Design characterisation and in planta expression of a chimeric xylanase
The recalcitrance of lignocellulosic biomass to enzymic digestion remains a significant obstacle to the adoption of an environmentally and economically sustainable strategy for the synthesis of biomaterials. Traditional industrial pre-treatments are harsh, require significant investments of energy …
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Studies of the mechanisms of stabilization of organic matter in semiarid soils
… were studied. These mechanisms are (1) chemical recalcitrance, (2) physical stabilization by adsorption onto soil particles, and (3) physical stabilization by occlusion within microaggregates. Mechanisms 1 and 2 were studied by incubation (mineralization) experiments using soil particle size …
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Accommodation-through-Bypassing : overcoming professionals' resistance to the implementation of algorithmic technology
… to using the technology, and that professionals' recalcitrance can ultimately impede the adoption of new technology despite managers' or developers' efforts. In my a 21-month field study of the development and implementation of three cases of machine learning-based algorithmic technology, I find …
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Improving barley for biofuel production – investigating the role of 4CL and CCR in the lignin biosynthesis pathway
… in the 21st Century is to overcome the recalcitrance of lignocellulose for the production of liquid biofuels. Lignin is one of the key factors in this recalcitrance. Grasses such as Miscanthus and switchgrass could become major sources of lignocellulose. Barley has potential as a …
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Biogeochemical Alteration of Particulate Pyrogenic Organic Carbon (pyC)
… respectively. We also observed that the overall recalcitrance of pine-derived <em>pyC</em>s decreases with time and the overall recalcitrance of CG-derived pyCs increases with time, as different portions of the <em>pyC</em>s are utilized by microbes depending on the microbial community present. …
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Improving Brassica napus straw for cellulosic ethanol production
… of testable hypotheses related to biomass recalcitrance and provides specific targets to conduct experiments, but molecular markers were sensitive to agronomic conditions. Arabidopsis plants deficient in a selection of candidate genes revealed subtle changes in saccharification performance. …
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Biosynthesis and function of glucuronic acid substitution patterns on softwood xylan
… is critical for the maintenance of biomass recalcitrance in a model vascular plant Arabidopsis thaliana. Experiments employing in vitro and in planta activity assays show that conifer transcriptomes encode at least two distinct GUX enzymes which are active glucuronosyltransferases. …
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Geochemical controls on the distribution and composition of biogenic and sedimentary carbon
… to contrast the roles of oxygen exposure, OC recalcitrance, and mineral-based protection of OC as preservation mechanisms. OC and nitrogen concentrations measured at these sites are among the lowest globally (<0.1%) and, to a first order, scale with sediment oxygenation. In the deep …
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Geochemical controls on the distribution and composition of biogenic and sedimentary carbon
… to contrast the roles of oxygen exposure, OC recalcitrance, and mineral-based protection of OC as preservation mechanisms. OC and nitrogen concentrations measured at these sites are among the lowest globally (<0.1%) and, to a first order, scale with sediment oxygenation. In the deep …
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Lignocellulose Saccharification via Cellulose Solvent Based Fractionation Followed by Enzymatic Hydrolysis: the Last Obstacle to Integrated Biorefineries
… technology was employed to overcome biomass recalcitrance. Surface response methodology (SRM) showed that optimal COSLIF pretreatment conditions were 85% (w/v) H₃PO₄ and ~50 °C, regardless of moisture contents in biomass from 5-15% (w/w) for common reed. Under these conditions, the pretreated …
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Mechanistic studies of Fusobacterium genetic and defense systems
… and endonucleases in host defense and genetic recalcitrance in several strains of Fusobacterium through bioinformatic and biochemical approaches. Altogether, over 15 DNA methyltransferases were characterized. Most notably, we identified and characterized two type II DNA methyltransferases that …
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Enhanced Dechlorination of 1,2-Dichloroethane by Coupled Nano Iron-Dithionite Treatment
… applications, widespread contamination and recalcitrance towards abiotic dechlorination, 1,2-DCA remains a challenging compound for the remediation community and one of the great research interests. Batch experiments combining bimetallic or monometallic nZVI (stabilized or non-stabilized) …
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Mechanisms of cell damage and recovery in cryopreserved freshwater protists
… ex Collins CCAP 745/1C enhanced its freeze-recalcitrance. Lipid deposition and inhibition of photosynthetic capacity on chilling were also detected in this alga.<br/><br/>An effective protocol, which avoided lethal cryoinjury, was developed for the previously freeze-recalcitrant alga …
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Solid phase microextraction of amino-dinitrotoluenes in tissue.
… tissue as a potential method to investigate the recalcitrance of metabolically-generated ADNTs versus absorbed ADNTs. Tubifex tubifex was allowed to metabolize TNT into ADNTs in 24-hr static non-renewal exposure test followed by 24-hr depuration in clean reconstituted hard water. …
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Intimate Exegesis: Reading and Feeling in Early Modern Devotional Literature
… interpretive practices out of mourning, recalcitrance, despair, nostalgia, and failure, all grounded in the peculiar passions of embodied femininity. In their work, difficult or even destructive feeling is not an obstacle to reading and devotion, but rather enables the reader’s …
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Microbial Ecology of a Bat Guano Community
… (pH), lack of "weather", and perhaps molecular recalcitrance are all significant limiting factors in the guano community and probably account for the accumulation of guano in piles.
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Consequences of nitrogen fertilization and soil acidification from acid rain on dissolved carbon and nitrogen stability in the unglaciated Appalachian Mountains
… in DOC concentration, chemical complexity and recalcitrance. These horizon-specific, differential responses to acid rain indicate that changes in the forest floor N economy were responsible for increased surface water NO3-N concentrations, whereas enhanced organomineral stability of DOC caused …
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