Cellulosic Ethanol
Mostrando 25-36 de 36 artigos, teses e dissertações.
-
25. Avaliação do potencial da casca de Eucalyptus spp. para a produção de bioetanol / Evaluation of the potential use of Eucalyptus spp. bark for bioethanol production
The use of no fossil source for biofuels production has been stimuled in the all world. Proposing a new global scenario related to the energy matrix, together with the environmental conditions, there is the need to search alternative renewable raw materials. In this context, Brazil presents special conditions, considering the lignocellulosic residues from th
Publicado em: 2010
-
26. Avaliação da tecnologia de hidrolise acida de bagaço de cana / Evaluation surgarcane bagasse acid hydrolysis technology
One of the current concerns in the world is the energy supply for next decades, since the main energy source used nowadays is oil, a not renewable and increasingly expensive fossil fuel. Acid hydrolysis of cellulosic materials, with a subsequent fermentation of the hydrolyzed to obtain ethanol, has been considered an important alternative to produce ethanol
Publicado em: 2007
-
27. Avaliação da potencialidade do uso de fibras de Eucalyptus como reforço alternativo em compositos de silicona
In this study, silicone composites reinforced with short Eucalyptus pulp fibers were obtained. Composites were prepared with untreated fibers and also with fibers modified with three different silane coupling agents, as vinyltriethoxysilane, methyltriethoxysilane, and g-glicidoxypropyltrimethoxysilane, using THF or ethanol as a solvent. The fibers were chara
Publicado em: 2003
-
28. Processo hibrido de polpação etanol-soda de madeira de eucalipto, com baixo teor alcoolico
The aim of this work was the development of a chemical wood pulping process free of sulfur compounds that could provide a quality cellulose without causing a severe environmental impact. All pulping variables were studied including bleaching (C.E.H1.H2), and physical properties of the crude and bleached pulps. The recovering of ethanol and soda was also veri
Publicado em: 1989
-
29. Ethanol Production by Thermophilic Bacteria: Fermentation of Cellulosic Substrates by Cocultures of Clostridium thermocellum and Clostridium thermohydrosulfuricum
The fermentation of various saccharides derived from cellulosic biomass to ethanol was examined in mono- and cocultures of Clostridium thermocellum strain LQRI and C. thermohydrosulfuricum strain 39E. C. thermohydrosulfuricum fermented glucose, cellobiose, and xylose, but not cellulose or xylan, and yielded ethanol/acetate ratios of >7.0. C. thermocellum fer
-
30. Direct and Efficient Production of Ethanol from Cellulosic Material with a Yeast Strain Displaying Cellulolytic Enzymes
For direct and efficient ethanol production from cellulosic materials, we constructed a novel cellulose-degrading yeast strain by genetically codisplaying two cellulolytic enzymes on the cell surface of Saccharomyces cerevisiae. By using a cell surface engineering system based on α-agglutinin, endoglucanase II (EGII) from the filamentous fungus Trichoderma
American Society for Microbiology.
-
31. Fermentation of Cellulosic Substrates in Batch and Continuous Culture by Clostridium thermocellum
Fermentation of dilute-acid-pretreated mixed hardwood and Avicel by Clostridium thermocellum was compared in batch and continuous cultures. Maximum specific growth rates per hour obtained on cellulosic substrates were 0.1 in batch culture and >0.13 in continuous culture. Cell yields (grams of cells per gram of substrate) in batch culture were 0.17 for pretre
-
32. A Modified Saccharomyces cerevisiae Strain That Consumes l-Arabinose and Produces Ethanol
Metabolic engineering is a powerful method to improve, redirect, or generate new metabolic reactions or whole pathways in microorganisms. Here we describe the engineering of a Saccharomyces cerevisiae strain able to utilize the pentose sugar l-arabinose for growth and to ferment it to ethanol. Expanding the substrate fermentation range of S. cerevisiae to in
American Society for Microbiology.
-
33. Effects of Stirring and Hydrogen on Fermentation Products of Clostridium thermocellum
Clostridium thermocellum produces ethanol, acetate, H2, and CO2 as major fermentation products from cellulose and cellobiose. The performance of three strains of this microorganism was studied to assess the potential use in producing ethanol directly from cellulosic fiber. Depending on the bacterial strain, an ethanol/acetate product ratio from 1 to as high
-
34. Genetically Engineered Saccharomyces Yeast Capable of Effective Cofermentation of Glucose and Xylose
Xylose is one of the major fermentable sugars present in cellulosic biomass, second only to glucose. However, Saccharomyces spp., the best sugar-fermenting microorganisms, are not able to metabolize xylose. We developed recombinant plasmids that can transform Saccharomyces spp. into xylose-fermenting yeasts. These plasmids, designated pLNH31, -32, -33, and -
American Society for Microbiology.
-
35. Building a foundation for structure-based cellulosome design for cellulosic ethanol: Insight into cohesin-dockerin complexation from computer simulation
The organization and assembly of the cellulosome, an extracellular multienzyme complex produced by anaerobic bacteria, is mediated by the high-affinity interaction of cohesin domains from scaffolding proteins with dockerins of cellulosomal enzymes. We have performed molecular dynamics simulations and free energy calculations on both the wild type (WT) and D3
Wiley Subscription Services.
-
36. Fermentation products and plant cell wall-degrading enzymes produced by monocentric and polycentric anaerobic ruminal fungi.
Five anaerobic fungal isolates from the bovine rumen were grown on Coastal Bermuda grass (CBG) leaf blades and monitored over a 9-day period for substrate utilization, fermentation products, cellulase, and xylanase activities. Two of the fungal isolates showed monocentric growth patterns; one (isolate MC-1) had monoflagellated zoospores and morphologically r