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Статті в журналах з теми "Xylose as substrate"
van Bastelaere, P., W. Vangrysperre, and H. Kersters-Hilderson. "Kinetic studies of Mg2+-, Co2+- and Mn2+-activated d-xylose isomerases." Biochemical Journal 278, no. 1 (August 15, 1991): 285–92. http://dx.doi.org/10.1042/bj2780285.
Повний текст джерелаWang, Zi-Han, Jing-Yan Tan, Yu-Tong Zhang, Nan-Qi Ren, and Lei Zhao. "Evaluating Bio-Hydrogen Production Potential and Energy Conversion Efficiency from Glucose and Xylose under Diverse Concentrations." Fermentation 8, no. 12 (December 14, 2022): 739. http://dx.doi.org/10.3390/fermentation8120739.
Повний текст джерелаHermansyah, Hermansyah, Fachrijal Fachrijal, Miksusanti Miksusanti, Fatma Fatma, Getari Kasmiarti, and Almunadi T. Panagan. "Xylose and Arabinose Fermentation to Produce Ethanol by Isolated Yeasts from Durian (Durio zibethinus L.) Fruit." Molekul 14, no. 2 (November 30, 2019): 133. http://dx.doi.org/10.20884/1.jm.2019.14.2.562.
Повний текст джерелаZepeda, S., O. Monasterio, and T. Ureta. "NADP+-dependent d-xylose dehydrogenase from pig liver. Purification and properties." Biochemical Journal 266, no. 3 (March 15, 1990): 637–44. http://dx.doi.org/10.1042/bj2660637.
Повний текст джерелаMuñoz-Páez, Karla María, and Germán Buitrón. "Role of xylose from acidic hydrolysates of agave bagasse during biohydrogen production." Water Science and Technology 84, no. 3 (June 24, 2021): 656–66. http://dx.doi.org/10.2166/wst.2021.242.
Повний текст джерелаKratzer, Regina, Stefan Leitgeb, David K. Wilson, and Bernd Nidetzky. "Probing the substrate binding site of Candida tenuis xylose reductase (AKR2B5) with site-directed mutagenesis." Biochemical Journal 393, no. 1 (December 12, 2005): 51–58. http://dx.doi.org/10.1042/bj20050831.
Повний текст джерелаBrink, Daniel P., Celina Borgström, Viktor C. Persson, Karen Ofuji Osiro, and Marie F. Gorwa-Grauslund. "D-Xylose Sensing in Saccharomyces cerevisiae: Insights from D-Glucose Signaling and Native D-Xylose Utilizers." International Journal of Molecular Sciences 22, no. 22 (November 17, 2021): 12410. http://dx.doi.org/10.3390/ijms222212410.
Повний текст джерелаFurlan, Sandra A., and Heizir F. de Castro. "Xylitol production by Candida parapsilosis under fed-batch culture." Brazilian Archives of Biology and Technology 44, no. 2 (June 2001): 125–28. http://dx.doi.org/10.1590/s1516-89132001000200003.
Повний текст джерелаKuenz, Anja, Malee Jäger, Harri Niemi, Mari Kallioinen, Mika Mänttäri, and Ulf Prüße. "Conversion of Xylose from Birch Hemicellulose Hydrolysate to 2,3-Butanediol with Bacillus vallismortis." Fermentation 6, no. 3 (September 2, 2020): 86. http://dx.doi.org/10.3390/fermentation6030086.
Повний текст джерелаMilessi-Esteves, Thais, Felipe Corradini, Willian Kopp, Teresa Zangirolami, Paulo Tardioli, Roberto Giordano, and Raquel Giordano. "An Innovative Biocatalyst for Continuous 2G Ethanol Production from Xylo-Oligomers by Saccharomyces cerevisiae through Simultaneous Hydrolysis, Isomerization, and Fermentation (SHIF)." Catalysts 9, no. 3 (March 1, 2019): 225. http://dx.doi.org/10.3390/catal9030225.
Повний текст джерелаДисертації з теми "Xylose as substrate"
Lebeau, Thierry. "Fermentation alcoolique de mélanges glucose-xylose par les levures Candida shehatae et Saccharomyces cerevisiae co-immobilisées dans un nouveau type de bioréacteur à membrane." Rouen, 1997. http://www.theses.fr/1997ROUES014.
Повний текст джерелаMurray, Leslie Justin. "Dioxygen activation and substrate hydroxylation by the hydroxylase component of toluene/O-xylene monooxygenase from pseudomonas sporium OX1." Thesis, Massachusetts Institute of Technology, 2007. http://hdl.handle.net/1721.1/41556.
Повний текст джерелаThis electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.
MIT Institute Archives copy includes accompanying CDROM with copy of thesis in .pdf format.
"September 2007." Vita.
Includes bibliographical references.
Non-heme carboxylate-bridged diiron centers in the hydroxylase components of the bacterial multicomponent monooxygenases activate dioxygen at structurally homologous active sites. Catalysis requires the management of four substrates: electrons, protons, dioxygen, and hydrocarbons. Protein component complexes control the delivery of these substrates to the diiron center in the hydroxylase ensuring selective hydrocarbon oxidation. A detailed mechanistic understanding of structural and chemical consequences of such interactions is a significant challenge. This thesis begins with an overview of our current understanding of these processes. The discussion is primarily on the methane monooxygenase systems (MMO) because these have been the most extensively studied BMMs to date. Recent results for the toluene/o-xylene monooxygenase (ToMO) and phenol hydroxylase systems from Pseudomonas sporium OX1 are also briefly summarized, the former being the research focus of this dissertation. Restricting access to the diiron center in ToMOH and other non-heme carboxylate-bridged diiron proteins was proposed to facilitate observation of oxygenated intermediates. To examine this hypothesis, dioxygen activation in ToMOH mutants that were predicted to occlude this channel was investigated by rapid-freeze quench (RFQ) EPR, Mossbauer, and ENDOR spectroscopy and stoppedflow optical spectroscopy. For the I100W mutant, a transient species is observed with an absorption maximum at 500 nm. EPR and Mossbauer spectra of RFQ samples identified this species as a diiron(III,IV) cluster spin-coupled to a neutral W radical. ENDOR spectra of this intermediate confirmed the protonation state and type of the amino acid radical and also identified a labile terminal water or hydroxide on the diiron center.
(cont.) Decay of this intermediate results in hydroxylation of the W radical. A diamagnetic precursor to the mixed-valent diiron(III,IV) center was also observed at an earlier time-point, with Mossbauer parameters typical of high-spin FeIII. We have tentatively assigned this antiferromagnetically-coupled diiron(III) intermediate as a peroxo-bridged cluster. A similar diiron(III) species is observed in RFQ Mossbauer samples from the reaction of reduced wild type hydroxylase with dioxygen. Substrate accelerates the decay rate of this species, providing evidence for the diiron(III) transient as the active oxidant. Under steady state conditions, hydrogen peroxide was generated in the absence of substrate. The oxidized hydroxylase also decomposed hydrogen peroxide to liberate dioxygen if no reducing equivalents were present. This catalase activity suggests that dioxygen activation could be reversible. The linear free energy relationship determined from steady state hydroxylation of para substituted phenols has a negative slope. A value of ? < 0 is indicative of electrophilic attack on the aromatic substrate by the oxidizing diiron(III) intermediate. The results from these steady state and pre-steady experiments provide compelling evidence that the diiron(III) transient is the active oxidant in ToMO and is a peroxodiiron(III) transient, despite differences between the optical and Mossbauer spectroscopic parameters and those of other peroxodiiron(III) centers. Enzymatic oxidation of the radical clock substrate probe, norcarane, by ToMO gives rise to both desaturation and hydroxylation products, norcarenes and norcaranols respectively.
(cont.) Norcarenes are better substrates for this enzyme system than norcarane, producing additional oxidation products. In all, more than twenty oxidation products were characterized in these reaction mixtures, half of which arose from norcarene oxidation. Accounting for these secondary oxidation products, we determined that no substrate radical intermediates with a significant lifetime (t < 25 ps) are formed during catalysis.
by Leslie Justin Murray.
Ph.D.
Babau, Maud. "Croissance et accumulation lipidique de Rhodotorula glutinis (rhodosporidium toruloides) sur glucose, xylose et glycérol : vers la valorisation des coproduits agricoles et industriels pour la production de lipides à usages énergétiques." Thesis, Toulouse, INSA, 2015. http://www.theses.fr/2015ISAT0027/document.
Повний текст джерелаRhodotorula glutinis (Rhodosporidium toruloides) is an oleaginous yeast. The micro-organism has demonstrated high lipid accumulation when utilizing glucose as a substrate, and has become a model for oil production. Glycerol and xylose are interesting as substrates for production of oil from renewable resources, but the capacity of R. glutinis to utilize glycerol and xylose as substrates has not been characterized well. Fermentation strategies were designed to quantify growth and lipid accumulation dynamics of R. glutinis when utilizing glycerol and xylose - either as pure substrates, or as co-substrates with glucose. Several original results have been found, including: - Co-consumption of xylose or glycerol along with glucose was observed, without carbon substrate accumulation or byproduct formation, when the carbon feed rate was carefully controlled. The specific carbon consumption rate decreases when the proportion of the second substrate (glycerol or xylose) increases in the feed, relative to glucose. - Growth capacities were characterized on pure xylose and pure glycerol in terms of growth rate and carbon yields: on xylose μmax= 0.034h-1 and RS/X= 0.28 Cmolx.Cmolxylose-1; on glycerol μmax=0.04h-1 RS/X=0.31Cmolx.Cmolglycerol-1. - specific production rate of lipid production and substrate to product carbon conversion yields from xylose or glycerol as single or cosubstrate with glucose were determinated: 20%xylose-80%glucose : qp=0.065CmolTAG.Cmolbiomasse.h-1, RS/P=0.3CmoleTAG.Cmolesubstrat-1 100%xylose : qp=0.035065CmolTAG.Cmolbiomasse.h-1, RS/P=0.31CmoleTAG.Cmolesubstrat-1, 25% glycerol-75%glucose : qp=0.07065CmolTAG.Cmolbiomasse.h-1, RS/P=0.25CmoleTAG.Cmolesubstrat-1 , 100% glycerol : qp=0.03065CmolTAG.Cmolbiomasse.h-1, RS/P= 0.29CmoleTAG.Cmolesubstrat-1. - Substrate diversification slightly impacts Rhodotorula glutinis´s lipid profile: xylose leads to an overproduction of C16:0 and C18:3 and glycerol increases C18:0 accumulation
Ponaire, Sarah. "Synthèse d'analogues de substrats ou d'inhibiteurs d'enzymes de la voie du 2-C-méthyl-D-érythritol 4-phosphate (MEP) pour la synthèse des isoprénoïdes." Strasbourg, 2010. https://publication-theses.unistra.fr/public/theses_doctorat/2010/PONAIRE_Sarah_2010_ED222.pdf.
Повний текст джерелаIsoprenoïds are components of the vast family of « natural compounds » present in all living organisms. They are biosynthetically obtained by two distinct pathways: the mevalonate pathway and the 2-C-methylerithritol 4-phosphate pathway; the latter is present in numerous pathogenous microorganisms and parasites. Growing microorganism resistance to antibiotics and antiparasitics forces us to identify new therapeutic targets to fight against pathogens. The great advantage of the 2-C-methylerithritol 4-phosphate pathway is that it is absent in humans thus being the ideal target to discover new antibiotics. To that end, we decided to synthesize six prodrugs derived from two phosphonic acids previously obtained in our research group. The latter, directly related to fosmidomycin were proven to be potent inhibitors of E. Coli’s DXR enzyme. The new prodrugs were tested on tobacco cell cultures, on BY-2 as well on Mycobacterium smegmatis. Results obtained on BY-2 show that our prodrugs are stronger inhibitors than fosmidomycin. Moreover, they still have an inhibitory effect on very low concentrations were fosmidomycin does not. In addition, organic synthesis of 2-C-methylerithritol 4-phosphate was studied. Though various protecting groups of the phosphate moiety were used and numerous protection / deprotection steps were tested, 2-C-methylerithritol 4-phosphate was never obtained. We then pursued our efforts on synthesizing dihydroyacetone phosphate, a small organic compound found in various metabolic pathways. The organic synthesis we propose surpasses all others by its simplicity and efficiency. Finally, we tried to synthesize L-glyceraldehyde 3-phosphate; this compound is the enantiomericaly pure substrate of DXS (deoxyxylulose phosphate synthase). Though many different synthetic schemes were tested, none of them yielded the desired product
Shu, Bing-Jui, and 許秉叡. "Using Glucose and Xylose as Sole Substrate for Fermentative Hydrogen Production in CSABRs." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/80578896322180405004.
Повний текст джерела逢甲大學
化學工程學所
94
Hydrogen Economy is the trend of the world energy policy. Hydrogen from biomass is promising for renewable hydrogen production, especially for biological methods. To develop the clean, low cost and low energy consumed processes for hydrogen production is the goal of our research team, Research Center for Energy and Resources in Feng Chia University. The traditional CSTR, bacteria wash-out occurred obviously when low hydraulic retention times, HRT, say HRT ≦ 4 h. In this study, biohydrogen production was investigated with two different aspect ratios (H/D = 3:1 & 8:1) in continuously stirred anaerobic bioreactors (CSABR) with immobilized anaerobic sludge. First the dark fermentation of hydrogen production was carried out by the immobilized cells, Endo nutrition formulation, the operating temperature of 40 ℃, and an aspect ratio of H/D = 3:1. The xylose substrates (20000 mg COD/L) were fed into the system with different HRT, which are 12, 6, 4, 2, 1 and 0.5 hours respectively. Second the experimental conditions were the same as the first case, but the xylose substrates ranges changed from 5000, 10000, 20000 up to 30000 mgCOD/L. For the aspect ratio of H/D = 8:1, the glucose substrates various form 10000, 20000, 30000 to 40000 mgCOD/L with Endo nutrition formulation were fed into the system with different HRT, which were 4, 2, 1 and 0.5 hours respectively. The results show that the porosity materials, granules formation had the maximum hydrogen production rate of 1.53 ± 0.06 H2 L/h/L when CXo = 20000 mg COD/L, and the hydrogen yield of 0.60 ± 0.02 mol H2/mol xylose. In the same circumstance, for H/D = 3:1 the granules formation facilitated hydrogen production, there had the maximum hydrogen production rate of 2.33 ± 0.21 H2 L/h/L when CXo = 30000 mg COD/L, and the hydrogen yield of 0.58 ± 0.05 mol H2/mol xylose individually. The hydrogen concentrations of the biogas were above 27.3%. Under different influent xylose concentrations (CXo= 5000, 10000, 20000, and 30000 mg COD/L), the results show that the maximum H2 production rate was 2.33 ± 0.21 H2 L/h/L when CXo = 30000 mg COD/L, and HRT = 1 h. For different influent glucose concentrations (CGo= 10000, 20000, 30000, and 40000 mg COD/L), the results show that the maximum H2 production rate was 7.52 ± 0.27 H2 L/h/L when CGo = 20000 mg COD/L, and the hydrogen yield was 1.54 ± 0.05 mol H2/mol glucose at HRT = 0.5 h. From this investigation, we found that the hexose (glucose) and pentose (xylose) from cellulose and/or hemi-cellulose hydrolysis will be the good sources of biohydrogen production.
Rung, Yang Jia, and 楊佳蓉. "Production of Xylo-oligosaccharides Using Corncob Substrate by Trametes versicolor LH1 Static Culture." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/88428603069240814573.
Повний текст джерела大葉大學
生物產業科技學系碩士在職專班
100
The white-rot fungi Trametes versicolor LH1 belongs to the basidomycetes class of fungi and is used to degrade celluloses and hemicelluloses. Trametes versicolor LH1 can produce bioactive ingredients and secrete hemicelluloses enzymes such as: xylanase, laccase and manganese peroxidase. Xylooligsaccharides contain two to seven molecules of xylose have been widely used in the food industry. We monitored the effect on the production of xylooligosaccharides in different inoculua and initial pH using corncob substrates by employing Trametes versicolor LH1 static cultures. The results were optimal in 10% of the inocula where the production biomass, extracellular polysaccharides (EPS) and xylanase were 10.57mg/ml, 1.04mg/ml and 58.25U/100ml, respectively. The optimal pH level was found to be pH5 in different initial pH levels (pH3-7) where the the production biomass, extracellular polysaccharides (EPS) and xylanase were 13.94mg/ml, 1.46mg/ml, 82.81U/100ml and 52.97 mg/ml, respectively. A nitrogen source of 0.3% was employed in a peanut powder extract with different initial pH levels (pH3-7) and the optimal pH level was found to be pH5 where the production biomass, extracellular polysaccharides (EPS), xylanase and xylooligosaccharide were 19.36mg/ml, 1.64mg/ml, 104.98U/100ml and 109.01mg/ml, respectively. The different initial pH levels were pH5>pH6>pH7>pH4>pH3 in the production of xylooligosaccharides. The different initial pH levels in the production of xylooligosaccharides in a 0.3% peanut powder extract were identical.
Fang, Kai-Ching, and 方凱慶. "Xylo-oligosaccharides Production of Submerged Fermentation by the Different Medicinal Fungi Using Corn Cob Substrate." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/56409215413951183393.
Повний текст джерела大葉大學
生物產業科技學系
100
Most medicinal fungi are rich in polysaccharides, which have been shown to have anti-tumor functions and inhibit cancer cell growth, strengthen the immune system or adjust the balance of the body, and exhibit other medicinally relevant properties such as anti-inflammatory or cholesterol regulatory properties. In addition, scholars have pointed out that medicinal fungi has a variety of enzymes, of which some like xylanase hemicellulose material produce xylooligosaccharides used in the pharmaceutical, cosmetics and food industries. Corn cob contains a lot of cellulose; a good source of raw materials for the production of xylooligosaccharides. In this experiment, cultures of Trametes versicolor, Antrodia camphorata, Grifola frondosa, Phellinus igniarius were placed in different media (corn cob as a carbon source, adding RO water; red sugar as the carbon source, adding peanut powder extract as a nitrogen source to explore xylooligosaccharide generation; corn cob and red sugar as a carbon source, adding add peanut powder extract as nitrogen source) employing temperatures (22℃, 25℃, 28℃) and oscillation rates (50rpm, 100rpm, 150rpm). The results show that at a temperature of 25℃ and an oscillation rate of 150rpm, Trametes versicolor can achieve a biomass and high extracellular polysaccharide and xylanase production, 2.59mg/mL, 0.99mg/mL and 32.57U/100mL respectively. Under the different temperatures condition, it was found that for Trametes versicolor the optimal temperature was 25℃, the biomass and extracellular polysaccharide and xylanase production were 3.63mg/mL, 2.96mg/mL and 43.08U/100mL respectively. Different oscillation rates proved to be optimal for Grifola frondosa, however, as the biomass and production of extracellular polysaccharides were higher at 150rpm, but the xylanase enzyme activity was higher at 100 rpm (2.53mg/mL 0.89mg/mL and 31.30 U/100mL, respectively). In different culture conditions in different media, the corn cob and red sugar as a carbon source with the addition of peanut powder extract as a nitrogen source, Antrodia camphorata was found to achieve a higher biomass and extracellular polysaccharide and xylanase activity (3.46mg/mL, 1.17mg/mL and 41.65U/100mL, respectively). With corn cob as the carbon source, Trametes versicolor achieved the highest biomass and xylooligosaccharides production (4.82mg/mL 54.32mg/mL, respectively), while Phellinus igniarius had the best extracellular polysaccharide production (1.48mg/mL). The highest xylanase activity was found in Antrodia camphorata in the corn cob as a nitrogen source (35.83U/100mL).
Тези доповідей конференцій з теми "Xylose as substrate"
Li, C. J., J. L. Li, and W. B. Wang. "The Effect of Substrate Preheating and Surface Organic Covering on Splat Formation." In ITSC 1998, edited by Christian Coddet. ASM International, 1998. http://dx.doi.org/10.31399/asm.cp.itsc1998p0473.
Повний текст джерелаDavis, Benjamin, Nitin Muralidharan, Cary Pint, and Matthew R. Maschmann. "Electrically Addressable Hierarchical Carbon Nanotube Forests." In ASME 2016 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/imece2016-67226.
Повний текст джерела