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 18 of 18 for “"pentoses"”.
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Lactic acid fermentation of xylose by Escherichia coli: carbon tracer studies on the C₂ + C₁ condensation reaction
… of these carbohydrates. In living systems the pentoses are undergoing continuous metabolic changes. It thus appeared that investigations concerning the metabolic decomposition of the pentose molecule would be important from a comparative biochemical point of view. The advantages of a microbial …
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Characterization and engineering of sugar transporters in the yeast Kluyveromyces marxianus for biotechnological applications
… sugars present in this raw material, hexoses and pentoses. This represents a key bottleneck because of the low number of specific pentose transporters identified and the slow rate of pentose uptake into the yeast cell when glucose is present. Kluyveromyces marxianus is a non-conventional yeast …
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Fermentação e cofermentação de glicose, xilose e arabinose por Meyerozyma caribbica
… literatura capacidade de fermentar isoladamente pentoses e hexoses, além de um possível mecanismo para resistência a álcoois baseados na presença de transportadores da família dos facilitadores maioritários na membrana celular, previamente caracterizada pelo nosso grupo de pesquisa. Assim sendo, …
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Production of lactic acid by microbial fermentation of hemicellulose sugars
… fermentation from starchy materials. Converting pentoses from lignocelluloses into lactic acid by lactobacillus has received much attention in recent years. The feasibility of improving lactic acid production from pentoses by using Lactobacillus pentosus (ATCC 8041) which is a facultative …
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Fermentation and energetic value of fiber in feed ingredients and diets fed to pigs
… 3 was conducted to test the hypothesis that pentoses that enter the small intestine may affect energy and CP utilization in pigs. Results indicated that AID of GE and OM in pigs fed a diet containing arabinose instead of glucose or xylose was reduced, but no difference was observed for the …
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Derivatives of benzyl n-benzoyl-a-d-glucosaminide
… monoamino-tetroses (12,19), nineteen monoamino-pentoses, two diamino-pentoses, thirty-three monoamino-hexoses, and eighteen diamino-hexoses (20) have been accomplished. It is well undterstood that the aminosugars, significant constituents in mnay biologically important materials (11), consist of …
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Nucleophilic displacement reactions of some carbohydrates in dimethyl sulphoxide
… the context of possible approaches to converting pentoses into hexoses by way of chain extension reactions at the C-5 carbon atom of pentofuranoses.
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Nucleophilic displacement reactions of some carbohydrates in dimethyl sulphoxide
… the context of possible approaches to converting pentoses into hexoses by way of chain extension reactions at the C-5 carbon atom of pentofuranoses.
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Exploring hydrothermal reactions : from prebiotic synthesis to green chemistry
… necessary and the main products are hexoses and pentoses, which accumulate due to their higher stability. In contrast, in high-temperature water no catalyst was necessary but a slightly alkaline solution was sufficient. Hexoses were only formed in negligible amounts, whereas pentoses and the …
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Discovery and characterization of pentose-specific transporters in Saccharomyces cerevisiae
… cannot be utilized by S. cerevisiae. Pentoses can only enter yeast cells through hexose transporters, which have two orders of magnitude lower affinities for pentose sugars. Additionally, inefficient pentose uptake has been shown to be the limiting step for some D-xylose metabolizing …
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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
… describes 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 …
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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
… describes 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 …
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The study of [beta]-cyclodextrin interactions with sugars using "inhibition kinetics" and the bromination of pyrimidine derivatives
… may be determined. Several aldoses were studied. Pentoses were found to bind modestly to [beta]-CD (K 1 = 100-1000 mM) and hexoses hardly bind at all (K 1 > 500 mM). The results obtained with the two probe reactions agree well with each other, and the K 1 values are compared to the disparate …
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Applications of LC-MS metabolomic profiling in inflammatory bowel disease and the development of derivatisation methods to enhance selective detection of certain compound classes
… differences in the pattern of hexoses, pentoses and deoxy hexoses in the urine and saliva samples.
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Nouvelles combinaisons thérapeutiques pour améliorer l'efficacité anti-tumorale de l'inhibition d'HDAC5
… de l’import du glucose dirigé vers la voie des pentoses phosphates assurant une production de NADPH, force réductrice du glutathion permettant ainsi de contrecarrer le stress oxydant et d’autre part, une glutamino-dépendance nécessaire au maintien des besoins énergétiques de la cellule. Par …
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Caracterização fisiológica de leveduras fermentadoras de xilose
A produção economicamente viável de etanol de segunda geração, depende principalmente de microrganismos capazes de fermentar a xilose, sendo o principal açúcar presente na fração hemicelulósica. A levedura Saccharomyces cerevisiae, não pode utilizar a xilose, uma vez que não possui transportador …
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Targeted and untargeted metabolomic profiling of human serum, urine and brain by liquid chromatography mass spectrometry (LC-MS)
… in tagging a range of other sugars including pentoses (ribose and xylose) and sugar derivatives (N-acetylneuraminic acid and glucuronic acid). The results highlighted a relationship between the increases in the levels of sugars and psychiatric disorders (SDB). This relation which matched with …
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Functional nanostructured hydrothermal carbons for sustainable technologies : heteroatom doping and superheated vapor
… material properties could be observed between pentoses and hexoses. The material obtained from a polysaccharide exhibited a slightly lower degree of carbonization but was otherwise similar to the monosaccharide derived samples. It was shown that in addition to thermally induced carbonization at …