Metabolic Engineering of Clostridium Tyrobutyricum for Production of Biofuels and Bio-based Chemicals PDF Download
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Author: Yali Zhang
Publisher:
ISBN:
Category : Biomass chemicals
Languages : en
Pages :
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Author: Yali Zhang
Publisher:
ISBN:
Category : Biomass chemicals
Languages : en
Pages :
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Author: Michael Pyne
Publisher:
ISBN:
Category :
Languages : en
Pages : 154
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Book Description
Reducing the production cost of industrial biofuels will greatly facilitate their proliferation and co-integration with fossil fuels. The cost of feedstock is the largest cost in most fermentation bioprocesses and therefore represents an important target for cost reduction. Meanwhile, the biorefinery concept advocates revenue growth through complete utilization of by-products generated during biofuel production. Taken together, the production of biofuels from low-cost crude glycerol, available in oversupply as a by-product of bioethanol production, in the form of thin stillage, and biodiesel production, embodies a remarkable opportunity to advance affordable biofuel development. However, few bacterial species possess the natural capacity to convert glycerol as a sole source of carbon and energy into value-added bioproducts. Of particular interest is the anaerobe Clostridium pasteurianum, the only microorganism known to convert glycerol alone directly into butanol, which currently holds immense promise as a high-energy biofuel and bulk chemical. Unfortunately, genetic and metabolic engineering of C. pasteurianum has been fundamentally impeded due to a complete lack of genetic tools and techniques available for the manipulation of this promising bacterium. This thesis encompasses the development of fundamental genetic tools and techniques that will permit extensive genetic and metabolic engineering of C. pasteurianum.
Author: Beth Alexandra Papanek
Publisher:
ISBN:
Category : Biomass energy
Languages : en
Pages : 91
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Book Description
Biofules are an important option for humanity to move away from its dependence on fossil fuels. Transitioning from food crops to lignocellulosic alternatives for the production of biofuels is equally important. Most commonly, biofuels are produced using a crop such as corn or soybeans to feed sugars to the yeast, Saccharomyces cerevisiae for the fermentation of ethanol. Lignocellulosic biofuel production would eliminate the need for food crops and transition to biomass such as switchgrass, poplar, or corn stover. Currently, lignocellulosic biofuel production is limited primarily because of the cost of converting the biomass to fermentable sugars than can then be metabolized by yeast. To overcome this barrier, a process must be employed that can convert lignocellulosic biomass directly to fuels and chemicals quickly and affordably. Clostridium thermocellum is one of the most promising candidates for the production of advanced biofuels because of its potential ability to convert cellulose directly to ethanol without the expensive addition of enzymes. Challenges to implementing C. thermocellum on an industrial scale still exist including side product formation, slow growth, limited titers, inhibition on high solids loadings, and a limited ability to perform genetic engineering. This thesis considers all of these concerns with C. thermocellum and attempts to systematically improve each characteristic to produce an industrially relevant strain of C. thermocellum for advanced biofuel production. Metabolic engineering is applied for the elimination of undesirable fermentation products. Laboratory evolution and medium supplementation are used to improve and understand the mechanisms that influence growth rate, and systematic approaches are used to improve transformation for more efficient genetic engineering of C. thermocellum in the future.
Author: Sang Yup Lee
Publisher: CRC Press
ISBN: 1000105555
Category : Science
Languages : en
Pages : 450
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This unique reference/text presents the basic theory and practical applications of metabolic engineering (ME). It offers systematic analysis of complex metabolic pathways and ways of employing recombinant DNA techniques to alter cell behavior, metabolic patterns, and product formation. Treating ME as a distinct subfield of genetic engineering, the book demonstrates new means of enabling cells to produce valuable proteins, polypeptides, and primary and secondary metabolites. Written by more than 35 leading international experts in the field, this book discusses metabolic engineering in plant and mammalian cells, bacteria, and yeasts and assesses metabolic engineering applications in agriculture, pharmaceuticals, and environmental systems. It illuminates the potential of the "cell factory" model for production of chemicals and therapeutics and examines methods for developing new antiviral and antibacterial molecules and effective gene and somatic-cell therapies. Metabolic Engineering also addresses the use of metabolic flux analysis, metabolic control analysis, and online metabolic flux analysis.
Author: Xiaorui Yang
Publisher:
ISBN:
Category :
Languages : en
Pages :
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In summary, C. cellulovorans was metabolically engineered to produce n-butanol and ethanol directly from cellulosic biomass, with the development of its transformation method for the first time. In addition, the engineered C. cellulovorans could produce 1.6 g/L n-butanol directly from cellulose, which is the highest, compared to other wild-type and engineered cellulolytic strains. This project provided a promising platform for the production of biofuel and other value-added products directly from lignocellulosic biomass.
Author: Jens Nielsen
Publisher: Springer Science & Business Media
ISBN: 9783540418481
Category : Bacteria
Languages : en
Pages : 504
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Book Description
Metabolic engineering is a rapidly evolving field that is being applied for the optimization of many different industrial processes. In this issue of Advances in Biochemical Engineering/Biotechnology, developments in different areas of metabolic engineering are reviewed. The contributions discuss the application of metabolic engineering in the improvement of yield and productivity - illustrated by amino acid production and the production of novel compounds - in the production of polyketides and extension of the substrate range - and in the engineering of S. cerevisiae for xylose metabolism, and the improvement of a complex biotransformation process.
Author: Pratish Gawand
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author: Ngoc phuong thao Nguyen
Publisher:
ISBN:
Category :
Languages : en
Pages : 215
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Current ly, there is a resurgence of interest in Clostridium acetobutylicum, the biocatalyst of the historical Weizmann process, to produce n-butanol for use both as a bulk chemical and as a renewablc alternative transportation fuel. This thesis describes a method of homologous recombination by replicative plasmid to delete or introduce genes in C. acetobutylicum . This method was successfull y used to delete genes, includin g CACJ502, CAC3535, CAC2879 (upp), to generate C. acetobutylicum. These strains are readily transformable without any previous plasmid methylation and can serve as hosts for a "marker-less" genetic exchange system. A mutant C. acetobutylicum (C. acetobuty licum CAB 1060) was successfully genera ted. This final mutant produces mainly bu tanol, with ethanol and traces of acetate at a molar rati o of 7:1 :1 . This CAB 1060 strain was subjected to a new continuous fermentation process using i) in situ extraction of alcohols by distillation under low pressure and ii) high cell density cultures to increase the titer, yield and productivity of n-butanol production to levels that have never been previously açhieved in any organism . A second homologous recombination method using non-replicative plasmid for marker less gene modification is also described in this thesis. This method allows the simultaneou s inactivation of two genes. lt has been successfully used to construct a mutant unable to produce hydrogen and useful, as a platform strain, for further engineering of C. acetobutylicum to continuously produce bulk chemicals and fuels.
Author: Hongxin Fu
Publisher: Frontiers Media SA
ISBN: 288974423X
Category : Science
Languages : en
Pages : 158
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Book Description
Author: Christoph Wittmann
Publisher: John Wiley & Sons
ISBN: 3527341811
Category : Science
Languages : en
Pages : 642
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Book Description
The latest volume in the Advanced Biotechnology series provides an overview of the main product classes and platform chemicals produced by biotechnological processes today, with applications in the food, healthcare and fine chemical industries. Alongside the production of drugs and flavors as well as amino acids, bio-based monomers and polymers and biofuels, basic insights are also given as to the biotechnological processes yielding such products and how large-scale production may be enabled and improved. Of interest to biotechnologists, bio and chemical engineers, as well as those working in the biotechnological, chemical, and food industries.
