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 10 of 10 for “"xylose fermentation"”.
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Improved xylose fermentation by expression of a putative xylose transporter encoding gene HXT2.4 in Saccharomyces cerevisiae
… Unfortunately S. cerevisiae cannot consume xylose, a pentose sugar which comprises almost 30% of lignocellulosic biomass. Metabolic and genetic engineering methods were used to develop S. cerevisiae that could consume xylose. However in S. cerevisiae, pentose sugars can only enter the cell …
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Optimal yeast strains for the production of fuels and chemicals from lignocellulosic biomass
… hexose and pentose sugars, mainly glucose and xylose, which are not efficiently fermented by microbes. Despite numerous efforts for improving xylose fermentation during the last two decades, a method for engineering efficient xylose-fermenting strains has not been finalized yet. In this thesis …
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Engineering Zymomonas mobilis for efficient fuel ethanol production from lignocellulosic feedstocks
… dedicated transporter for the five carbon sugar xylose in recombinant Z. mobilis. Specifically, the xylE transporter gene from Escherichia coli was expressed in a xylose-fermenting strain of Z. mobilis and glucose-xylose co-fermentation and xylose fermentation were analyzed. The engineered strain …
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Metabolic engineering of yeast strains for renewable biomass utilization and valuable chemical production
… lignocellulosic biomass, mainly cellobiose and xylose, cannot be assimilated by the industrial microorganisms, such as yeast Saccharomyces cerevisiae. To utilize cellobiose or xylose for the fuels and chemicals production by S. cerevisiae strains, heterologous expression of cellobiose or xylose …
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¹³C-metabolic flux analysis of recombinant yeasts for biofuels applications
… ethanol and biodiesel are produced by yeast fermentation of sugars derived from cornstarch and sucrose and transesterification of vegetable oils, respectively. However ethanol has many drawbacks as a fuel additive, and both biofuels are currently produced from edible feed stocks. For biofuels …
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Reduced extracellular electron shuttles increase hydrogen production and substrate utilization in pure culture Clostridium beijerinckii fermentation
… developed to increase sugar utilization in the fermentation process. This study aims to bridge the gap between the current status of biological hydrogen production and future industrial applications by developing an innovative physiological strategy (adding reduced electron shuttles) to increase …
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Systematic and combinatorial approaches for metabolic engineering of optimal yeast strains to produce fuels and chemicals
… with superlative characteristics for enhancing fermentation of glucose and other hexoses (sucrose, fructose, and mannose). Although deletion of a respiratory enzyme subunit (Cox9) identified by the model-based approach severely inhibited galactose metabolism, the deletion was a necessary …
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Metabolic engineering of Saccharomyces cerevisiae for efficient ethanol production from pentose sugars
… Among them, one arabinose-specific and two xylose-specific transporters from Pichia stipitis and Neurospora crassa were identified. All transporters were functionally expressed and properly localized in S. cerevisiae as indicated by HPLC analysis and immunofluorescence microscopy, …
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Enhanced bioethanol fermentation from mixed xylose and glucose using free and immobilized cultures: mathematical model and experimental observation
… of the production of bioethanol from glucose and xylose which are the two most abundant sugars in hydrolysed sugarcane bagasse. To date, no suitable wild type organisms can concomitantly ferment both glucose and xylose to ethanol efficiently. Options to address the co-fermentation of glucose and …
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APPLIED MICROBIAL ECOLOGY OF ANAEROBIC REACTOR MICROBIOMES
… waste streams or biomass residues by anaerobic fermentation in the form of medium-chain carboxylates. It has created great opportunities to replace chemicals derived from non-sustainable sources such as fossil feedstock. Mixed culture fermentation is commonly employed for the chain elongation …