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 20 for “"D-xylose"”.
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Xylitol Production From D-Xylose by Facultative Anaerobic Bacteria
… 10 of the 17 species screened could grow on D-xylose and produce detectable quantities of xylitol during 24-96 h of fermentation. The ten bacterial species were studied for the effect of environmental factors, such as temperature, concentration of D-xylose, and aeration, on xylitol production. …
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Discovery and characterization of pentose-specific transporters in Saccharomyces cerevisiae
… been shown to be the limiting step for some D-xylose metabolizing yeast strains. In this thesis, we report the discovery of seven active pentose transporters from pentose assimilating fungal species Pichia stipitis and Neurospora crassa based on sequence homology with the glucose/xylose/H+ …
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Engineering a Fungal L-Arabinose Pathway Towards the Co-Utilization of Hemicellulosic Sugars for Production of Xylitol
… can utilize both hemicellulosic pentose sugars D-xylose and L-arabinose from renewable plant biomass as feed substrates, my thesis research focused on utilizing a fungal-derived biosynthetic pathway for production of xylitol. The pathway consists of two NADPH-dependent reductases, xylose reductase …
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Engineering a Fungal L-Arabinose Pathway Towards the Co-Utilization of Hemicellulosic Sugars for Production of Xylitol
… can utilize both hemicellulosic pentose sugars D-xylose and L-arabinose from renewable plant biomass as feed substrates, my thesis research focused on utilizing a fungal-derived biosynthetic pathway for production of xylitol. The pathway consists of two NADPH-dependent reductases, xylose reductase …
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Optimizing xylitol production: a molecular and experimental study of xylose reductase in Candida tropicalis
… the ability of Candida tropicalis to convert D-xylose into xylitol through the enzyme xylose reductase, with a focus on optimizing pH conditions to enhance conversion efficiency. To achieve this, both experimental fermentation and computational molecular dynamics simulations using GROMACS and …
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Engineering of Saccharomyces cerevisiae for renewable production of plastic precursor chemicals from plant biomass
… biosynthetic route for MEG production from D-xylose in S. cerevisiae.
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Evaluation of three heterologous xylose isomerase genes for the fermentation of plant biomass to bioethanol in Saccharomyces cerevisiae
… to the fuel ethanol. In this study, three xylose isomerase genes originating from Haemophilus influenzae Rd K20, Arabidopsis thaliana and Bacteroides thetaiotaomicron VPI-5482 were expressed in S. cerevisiae to produce a strain capable of metabolising D-xylose (a biomass constituent). …
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Characterization and encapsulation of probiotic bacteria using a Pea-protein Alginate matrix
… carbohydrates including -methyl-D-glucoside, D-xylose, D-cellobiose, and -D-lactose; whereas,L. acidophilus, B. infantis, and B. adolescentis utilized D-xylose. Lactobacillus acidophilus was ultimately selected for encapsulation in a 3 mm diameter pea protein-alginate matrix followed by in vitro …
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In Vitro Synthetic Biology Platform and Protein Engineering for Biorefinery
… phosphate groups, was synthesized from D-xylose and polyphosphate via a minimized two-enzyme system using a promiscuous activity of xylulose kinase. Under the optimized condition, 32 mM Xu5P was produced from 50 mM xylose and polyphosphate, achieving a 64% conversion yield, after 36 h at …
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Non-electrolyte transport in brush border membrane vesicles from bovine small intestine
… and inhibited by phloridzin, D-galactose, and D-xylose. Transport of L-alanine was sodium stimulated and mediated by at least two systems. Apparent affinities for L-alanine transport were .039, and .943 mM. Maximum velocities were 29.2, and 53.4 pmoles/mg protein/sec, for the two systems. …
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XYLARIC ACID, D-ARABINARIC ACID (D-LYXARIC ACID), L-ARABINARIC ACID (L-LYXARIC ACID), AND RIBARIC ACID-1,4-LACTONE; SYNTHESIS AND ISOLATION - SYNTHESIS OF POLYHYDROXYPOLYAMIDES THEREFROM
… the nitric acid oxidation of the pentoses D-xylose, L-arabinose, D-arabinose, and D-ribose to produce xylaric acid, L-arabinaric acid (L-lyxaric acid), D-arabinaric acid (D-lyxaric acid), and ribaric acid, respectively, or salts therefrom. Isolation of the aldaric acids from nitric acid has …
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XYLARIC ACID, D-ARABINARIC ACID (D-LYXARIC ACID), L-ARABINARIC ACID (L-LYXARIC ACID), AND RIBARIC ACID-1,4-LACTONE; SYNTHESIS AND ISOLATION - SYNTHESIS OF POLYHYDROXYPOLYAMIDES THEREFROM
… the nitric acid oxidation of the pentoses D-xylose, L-arabinose, D-arabinose, and D-ribose to produce xylaric acid, L-arabinaric acid (L-lyxaric acid), D-arabinaric acid (D-lyxaric acid), and ribaric acid, respectively, or salts therefrom. Isolation of the aldaric acids from nitric acid has …
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Untersuchungen zur Biosynthese und Regulation von Oligosaccharid-Antibiotika
… der UDP-D-Glucuronsäure zur UDP-D-Xylose katalysiert. Nach Inaktivierung von AviX12, einem Protein aus der Familie der Radical-SAM-Enzyme, kam es zur Bildung eines neuen Avilamycin-Derivats, Gavibamycin N1, das anstelle der Mannose eine Glucose enthält. Nach heterologer Expression …
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Cranberry metabolites with urinary anti-adhesion activity
… D-glucose backbone and possessing two D-xylose-L-arabinose side chains, was purified from the oligosaccharide mixture of active urine fractions in sufficient quantity to assign the full structure. Oligosaccharide mixtures of similar character were subsequently identified in cranberry …
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Radical Tools to Transform Biomass Sugars
… on commercial scales (e.g. D-glucose, D-xylose, D-galactose), there are > 500 ’rare’ sugars that feature prominently and are difficult to isolate from natural sources. Instead, these rare glycosides are typically prepared through multistep chemical syntheses which commonly rely on …
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I. Progress Toward Leiodelide A II. Palladium-Catalyzed Reactions of Enol Ethers
… The northern hemisphere was synthesized from D-xylose producing both C13 epimers. Having both possible epimers at the unassigned center of leiodelide A will allow for determination of the absolute configuration of leiodelide A.</p><p>The southern hemisphere of leiodelide A was produced in three …
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The oxygen uptake by pseudomonas fluorescens on glucose, xylose, arabinose and acetate under varying conditions of substrate concentration and environmental temperature
… of environment. The substrates were D-glucose, D-xylose, L-arabinose and acetate, and the temperatures investigated ranged from 15 to 37 ºC. Oxygen uptakes were determined manometrically using the direct Warburg method in conjunction with resting cell techniques. In all tests 3.0 milligrams or …
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Study of the aldopentoses and fucose in human urine by thin-layer chromatography
… of four free, monosaccharides, L- arabinose, D-xylose, D-ribose and (presumably -) fucose in the urine of healthy human subjects and of patients suffering from renal failure. • 2. Two new quantitative analytical procedures based on one - dimensional thin-layer chromatography have been devised …
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Regulation and switching in bacterial gene expression networks in response to nutrients
… during growth on lactose, L-arabinose, and D-xylose. The metabolism of these sugars is regulated in a hierarchical manner, where lactose is the preferred sugar, followed by arabinose, and then xylose. Previously, the preferential utilization of arabinose over xylose was found to result from …