Download or read book Computational and Experimental Investigation of the Enzymatic Hydrolysis of Cellulose written by Prabuddha Bansal and published by . This book was released on 2011 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The enzymatic hydrolysis of cellulose to glucose by cellulases is one of the major steps in the conversion of lignocellulosic biomass to biofuel. This hydrolysis by cellulases, a heterogeneous reaction, currently suffers from some major limitations, most importantly a dramatic rate slowdown at high degrees of conversion in the case of crystalline cellulose. Various rate-limiting factors were investigated employing experimental as well as computational studies. Cellulose accessibility and the hydrolysable fraction of accessible substrate (a previously undefined and unreported quantity) were shown to decrease steadily with conversion, while cellulose reactivity, defined in terms of hydrolytic activity per amount of actively adsorbed cellulase, remained constant. Faster restart rates were observed on partially converted cellulose as compared to uninterrupted hydrolysis rates, supporting the presence of an enzyme clogging phenomenon. : Cellulose crystallinity is a major substrate property affecting the rates, but its quantification has suffered from lack of consistency and accuracy. Using multivariate statistical analysis of X-ray data from cellulose, a new method to determine the degree of crystallinity was developed. Cel7A CBD is a promising target for protein engineering as cellulose pretreated with Cel7A CBDs exhibits enhanced hydrolysis rates resulting from a reduction in crystallinity. However, for Cel7A CBD, a high throughput assay is unlikely to be developed. In the absence of a high throughput assay (required for directed evolution) and extensive knowledge of the role of specific protein residues (required for rational protein design), the mutations need to be picked wisely, to avoid the generation of inactive variants. To tackle this issue, a method utilizing the underlying patterns in the sequences of a protein family has been developed.
Download or read book Kinetic Study of Enzymatic Hydrolysis of Exploded Wood written by Canada Centre for Mineral and Energy Technology. Efficiency and Alternative Energy Technology Branch and published by The Branch. This book was released on 1990 with total page 288 pages. Available in PDF, EPUB and Kindle. Book excerpt: Final report of an examination of the mechanism and kinetics of the enzymatic hydrolysis process. The study compares several substrates and enzymes in hydrolysis systems and provides a framework for optimizing hydrolysis engineering analysis and reactor design. The report describes experimental studies of the kinetic factors that govern the hydrolysis of cellulose to glucose by cellulase enzymes; experimental and modelling studies of hydrolysis systems, giving the results of six assays combined into a model of hydrolysis with no arbitrary assumptions; verifies the model predictions with experimental data; compares the experimental data for a wide variety of hydrolysis reactors; and evaluates a variety of designs for hydrolysis reactor systems. Cellulosic substrates used include Sigmacell, a pure, highly crystalline commercial cellulose; Acid-Swollen Cellulose, an amorphous material made from Sigmacell; and Exploded Wood Cellulose, a crystalline lignocellulose.
Download or read book Theoretical and Computational Chemistry written by Iwona Gulaczyk and published by Walter de Gruyter GmbH & Co KG. This book was released on 2021-06-08 with total page 270 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book explores the applications of computational chemistry ranging from the pharmaceutical industry and molecular structure determination to spectroscopy and astrophysics. The authors detail how calculations can be used to solve a wide range of practical challenges encountered in research and industry.
Download or read book Enzymatic Hydrolysis of Cellulose written by and published by . This book was released on 1991 with total page 99 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Enzymatic Hydrolysis of Cellulose written by Natalija Andersen and published by . This book was released on 2007 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Enzymatic Hydrolysis of Cellulose written by Bingham Hood Van Dyke and published by . This book was released on 1972 with total page 662 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Cellulose Hydrolysis written by Liang-tseng Fan and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 204 pages. Available in PDF, EPUB and Kindle. Book excerpt: Recent economic trends, especially the worldwide decline in oil prices, and an altered political climate in the United States have combined to bring about major reductions in research on renewable energy resources. Yet there is no escaping the "facts of life" with regard to these resources. The days of inexpensive fossil energy are clearly numbered, the credibility of nuclear energy has fallen to a new low, and fusion energy stands decades or more from practical realization. Sooner than we may wish ,we will have to turn to renewable raw materials - plant "biomass" and, especially, wood - as significant suppliers of energy for both industry and everyday needs. It is therefore especially important to have a single, comprehensive and current source of information on a key step in any process for the technological exploitation of woody materials, cellulose hydrolysis. Further more, it is essential that any such treatment be unbiased with respect to the two methods - chemical and biochemical - for the breakdown of cellulose to sugars. Researchers on cellulose hydrolysis have frequently been chided by persons from industry, especially those individuals concerned with determining the economic feasibility of various technological alternatives. They tell us that schemes for the utilization of wood and other such resources fly in the face of economic realities.
Download or read book Kinetic Study on the Enzymatic Hydrolysis of Cellulose written by Huiying Wang and published by . This book was released on 1990 with total page 262 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Technical Literature Abstracts written by Society of Automotive Engineers and published by . This book was released on 1994 with total page 626 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Comprehensive Dissertation Index written by and published by . This book was released on 1984 with total page 904 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Energy Research Abstracts written by and published by . This book was released on 1980 with total page 1346 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Lignocellulose Conversion written by Vincenza Faraco and published by Springer Science & Business Media. This book was released on 2013-06-12 with total page 207 pages. Available in PDF, EPUB and Kindle. Book excerpt: Bioethanol has been recognized as a potential alternative to petroleum-derived transportation fuels. Even if cellulosic biomass is less expensive than corn and sugarcane, the higher costs for its conversion make the near-term price of cellulosic ethanol higher than that of corn ethanol and even more than that of sugarcane ethanol. Conventional process for bioethanol production from lignocellulose includes a chemical/physical pre-treatment of lignocellulose for lignin removal, mostly based on auto hydrolysis and acid hydrolysis, followed by saccharification of the free accessible cellulose portions of the biomass. The highest yields of fermentable sugars from cellulose portion are achieved by means of enzymatic hydrolysis, currently carried out using a mix of cellulases from the fungus Trichoderma reesei. Reduction of (hemi)cellulases production costs is strongly required to increase competitiveness of second generation bioethanol production. The final step is the fermentation of sugars obtained from saccharification, typically performed by the yeast Saccharomyces cerevisiae. The current process is optimized for 6-carbon sugars fermentation, since most of yeasts cannot ferment 5-carbon sugars. Thus, research is aimed at exploring new engineered yeasts abilities to co-ferment 5- and 6-carbon sugars. Among the main routes to advance cellulosic ethanol, consolidate bio-processing, namely direct conversion of biomass into ethanol by a genetically modified microbes, holds tremendous potential to reduce ethanol production costs. Finally, the use of all the components of lignocellulose to produce a large spectra of biobased products is another challenge for further improving competitiveness of second generation bioethanol production, developing a biorefinery.
Download or read book Biomass Recalcitrance written by Michael Himmel and published by Wiley-Blackwell. This book was released on 2008-06-23 with total page 552 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book examines the connection between biomass structure, ultrastructure, and composition, to resistance to enzymatic deconstruction, with the aim of discovering new cost-effective technologies for biorefineries. It contains chapters on topics extending from the highest levels of biorefinery design and biomass life-cycle analysis, to detailed aspects of plant cell wall structure, chemical treatments, enzymatic hydrolysis, and product fermentation options."--Pub. desc.
Download or read book Advances in 2nd Generation of Bioethanol Production written by Xin Lu and published by Woodhead Publishing. This book was released on 2021-01-29 with total page 266 pages. Available in PDF, EPUB and Kindle. Book excerpt: Advances in 2nd Generation of Bioethanol Production presents a comprehensive overview of technologies and strategies for the conversion of lignocellulosic biomass. This includes issues like sustainable production, environmental and economic benefits, and the main hurdles for upscaling and achieving commercial viability. The book assesses the current biomass conversion technologies, their readiness level for commercial production, and applications of bioethanol in bioenergy and chemical feedstock. The essential conversion process of 2nd generation biofuels, including feedstock composition and pretreatment, is then broken down, with special focus on advantages and pitfalls of each feedstock and process. It also explores the advances and challenges of bioprocessing, hydrolysis technologies and simultaneous fermentation of pentose and hexose. Finally, it presents the current status and bottlenecks for industrial production of bioethanol, as well as its future prospects. Its interdisciplinary approach, drawing upon plant biology, chemistry, biochemistry, microbiology, and genetics, makes Advances in 2nd Generation of Bioethanol Production a must-have reference for researchers in academia and industry R&D. It allows them to compare challenges and opportunities of new technologies and identify the gaps where new technology is needed. Practitioners in the industry also benefit from the information on working principles, design and control of the bioethanol production process, highlighting areas where technology innovation and investment should be placed. Graduate students and researchers newly entered in this field find here a key-resource to thoroughly understand the process as well as the fundamentals of bioethanol and bioproducts production from lignocellulosic biomass. Presents fundamentals and state-of-the-art of available pathways for bioethanol and bioproducts production from lignocellulosic biomass Discusses key-challenges for large scale production of bioethanol, such as pretreatment and hydrolysis Covers the specificities of various feedstocks and processes, the role of microorganisms in fermentation, saccharification limitations and challenges in the C5 and C6 fermentation
Download or read book Cellulose Nanocrystal Nanoparticles Hybrid Nanocomposites written by Denis Rodrigue and published by Woodhead Publishing. This book was released on 2021-08-26 with total page 294 pages. Available in PDF, EPUB and Kindle. Book excerpt: Cellulose Nanocrystal/Nanoparticles Hybrid Nanocomposites: From Preparation to Applications presents a broad survey of the main innovations in the field of functionalized cellulose at the nanoscale and for hybrid nanoparticles-based nanocomposites for industrial application. The book covers the properties and applications of cellulose, including particle extraction, synthesis, functionalization of cellulose at the nanoscale, and hybrid nanoparticles and their processing and characterizations. Readers will find this to be a single and comprehensive reference for future research on polymer-based nanocomposites. Hybrid nanocomposites based on cellulose at the nanoscale, and hybridized with other reinforcement agents represent a key advance in polymer-based materials. Cellulose is considered the most abundant polymer on the planet and an essential renewable resource. There is considerable research interest in the simple extraction and synthesis, nanoscale dimensions, high aspect ratio, mechanical, electrical and thermal properties of cellulose at the nanoscale and its hybridized materials. Nanocomposites and bio-nanocomposites with hybrid reinforcements, for example, are novel materials with enhanced properties due to the integration of cellulose with other nanoparticles, and new methods have been developed to extract cellulose at the nanoscale. The extracted cellulose shows potential applications in nanocomposites, and functionalization techniques are essential to create enhanced nanocomposites, particularly for hybrid nanoparticles. - Presents the state-of-the-art in functionalized cellulose at the nanoscale, along with industrial applications of hybrid-nanoparticles-based nanocomposites - Details the properties and applications of cellulose at the nanoscale and for hybrid nanocomposites - Gives updates on hybrid nanoparticles, including the processing and characterization of nanocomposites - Brings together expertise from chemistry, polymer science, engineering and manufacturing
Download or read book Solar Energy Update written by and published by . This book was released on 1980-04 with total page 636 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1979 with total page 1096 pages. Available in PDF, EPUB and Kindle. Book excerpt:
