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6篇 您的检索式:作者名="Chaplen"
    题名 作者 年代 出处 被引量
1Antial- lergic activity of 2-phenyl-8-'azapurin-6-ones 显示文摘Broughton B J P Chaplen P Knowles 1975J Med Chem1975,18,11:1
2Method for determination of free intracellular and extracellular methylglyoxal in animal cells grown in culture显示文摘Chaplen FW Fahl WE Cameron DC 1996Anal Biochem1996,238,2:1
3Phase II Study of Docetaxel and Celecoxib, a Cyclooxygenase-2 Inhibitor, in Elderly or Poor Performance Status (PS2) Patients with Advanced Non-small Cell Lung Cancer显示文摘Shirish M. Gadgeel Antoinette Wozniak John C. Ruckdeschel Lance K. Heilbrun Raghu Venkatramanamoorthy Ruth A. Chaplen Michael J. Kraut Gregory P. Kalemkerian 2008Journal of Thoracic Oncology2008,,11:1
4Incidence and potential implications of the toxic metabolite methylglyoxal in cell culture:A review显示文摘CHAPLEN F WR 1998Cytotechmology1998,26,3:1
5Method for determination of free intracellular and extracellular methylglyoxal in animal cells grown in culture显示文摘CHAPLEN FW FAHL WE CAMERON DC 1996Anal Biochem1996,238,2:1
6Using high-throughput data and dynamic flux balance modeling techniques to identify points of constraint in xylose utilization in Saccharomyces cerevisiae显示文摘Background Several enzymes and cofactors have been identified as contributing to the slow utilization of xylose by xylose-fermenting strains of Saccharomyces cerevisiae.However,there has been no consensus on which of these possible bottle-necks are the most important to address.A previous strain characterization study from our lab suggested that insufficient NAD+limits fermentation and may be the most important bottleneck affecting utilization of xylose for the production of ethanol.The development and validation of a genome scale dynamic flux balance model would help to verify the existence and extent of this and other metabolic bottlenecks and suggest solutions to guide future strain development thereby minimiz-ing bottleneck impact on process economics.Results A dynamic flux balance model was developed to identify bottlenecks in several strains of S.cerevisiae,both with wild-type pentose phosphate pathway expression and with the pathway over expressed.ZWF1 was found to be limiting in the oxidative portion of the pentose phosphate pathway under oxygen replete conditions.This pathway is used to regenerate NADPH.Under oxygen limiting conditions,respiration of xylose was limited by the lack of oxygen as a terminal electron acceptor.Ethanol production was also limited under these conditions due to the inability to balance NAD+/NADH.The model suggests the use of the anaplerotic glyoxylate pathway to improve NAD+/NADH balance,increasing ethanol produc-tion by 50%while producing succinate as a coproduct at upwards of 20 g/l.Conclusion In the production of high value chemicals from biomass,the use of the respiratory metabolism is a waste of feedstock carbon.Bottlenecks previously identified in the oxidative pentose phosphate pathway are currently only relevant under oxygen-replete conditions and cannot impact the partitioning of carbon between the respiratory and fermentative pathways.Focusing future efforts on the non-respiratory balancing of NAD+/NADH,perhaps through the glyoxylate pathway,would improve the economics of ethanol production both directly and through coproduct formation.William Hohenschuh Ronald E.Hector Frank Chaplen Ganti S.Murthy 2021Systems Microbiology and Biomanufacturing2021,1,1:0
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