Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 18 of 18 for “"Ethanol Fermentation"”.
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Cross-flow ceramic microfiltration of ethanol fermentation broths
… the ceramic cross-flow microfiltration of ethanol fermentation broths. The ceramic membranes from three different manufacturers were made of $\alpha$-alumina with pore sizes of 0.05 $\mu$m-1.4 $\mu$m. Water permeabilities for the 0.2 $\mu$m Ceraver, Ceraflo and CeraMem membranes were 903, …
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Modelling of batch and fed-batch ethanol fermentation
Two series of batch and fed-batch fermentations were carried out using S.cerevisiae in a semi-defined medium containing 200 gl-1 glucose as limiting substrate. Growth rates were calculated and the data used to test the applicability of eight empirical kinetic models. The form proposed by …
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The effects of the expression levels of cellobiose transporter and β-Glucosidase on ethanol fermentation
Recently, cofermentation of cellobiose and xylose in yeasts has been reported. It is considered as one of the most innovative strategies to enhance bioethanol production from lignocellulosic fermentation. Through cofermentation with cellobiose and xylose, it is achieved to utilize most abundant two …
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Physiological Changes Occurring in the Cellular Membranes of Clostridium Acetobutylicum ATCC 824 and a Butanol-Tolerant Mutant During the Acetone-Butanol-Ethanol Fermentation
The acetone-butanol-ethanol fermentation by Clostridium acetobutylicum is not able to compete economically with the petroleum methods, due to the premature termination of this fermentation from the butanol produced by the cell. It is known that alcohols disrupt the membrane structure and function, …
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Modification of Fermentation by Exogenous Energy Input
… on earth. Yeasts, the microbial driver of ethanol fermentation, evolved on the surface of vegetation and had to adapt to survive photonic assault. Past research has demonstrated that white light affects yeast metabolism along with the ability to entrain circadian rhythms, although no known …
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Systematic and combinatorial approaches for metabolic engineering of optimal yeast strains to produce fuels and chemicals
… in Saccharomyces cerevisiae for enhancing bioethanol production from glucose with minimal impact on biomass yield. Due to the limited scope of stoichiometric models, genetic screening was combined with the model-based technique, and this led to identification of three knockout mutants (∆cox9, …
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Production of biofuels and biodegradable plastics from common waste substrates in engineered Ralstonia eutropha
… plant oils, as well as vinasse, a byproduct of ethanol fermentation. Metabolic versatility and genetic tractability combined with its ability to store a variety of carbons make R. eutropha an excellent platform organism for the production of value-added compounds. Demonstrated in this thesis are …
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Production of 1-butanol and butanol isomers by metabolically engineered Clostridium beijerinckii and Saccharomyces cerevisiae
… has been produced from the ABE (acetone-butanol-ethanol) fermentation by solventogenic clostridia such as Clostridium beijerinckii. Although the ABE fermentation is considered as a promising process for butanol production, current drawbacks in the ABE fermentation include low titer, yield, and …
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Bioethanol Production from Macroalgae
… biomass has been identified as a potential fermentation substrate for third generation biofuel processes due to its high carbohydrate content and its potential for mass cultivation without competing for agricultural land, fresh water and fertilisers. This thesis aimed to develop and advance …
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Structural and biochemical studies on enzymes involved in natural product biosynthesis and cellular respiration
… providing the necessary precursor for ethanol fermentation. In chapter 1 we present several crystal structures of the PL-17 enzyme Alg7c from S. degredans, including the wild-type enzymes, respective mutants, and a co-crystal structure of one of the varients in complex with an alginate …
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Activated Carbon Preparation and Modification for Adsorption
… Butanol has a higher energy content than ethanol and can be used in conventional gas engines without modifications. Unfortunately, the fermentation pathway for butanol production is restricted by its toxicity to the microbial strains used in the process. Butanol is toxic to the microbes, …
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Enhanced bioethanol fermentation from mixed xylose and glucose using free and immobilized cultures: mathematical model and experimental observation
Bioethanol plays a significant role in the world of liquid biofuel. However, majority of bioethanol is produced from edible food crops such as corn and sugarcane that causes an increase in demand for vacant lands for food production and, subsequently, increase in the cost of food manufacturing. …
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Production of Ethanol from Cereal Food Fines using Dilute-Acid Hydrolysis
… value as a feedstock for the production of fuel ethanol via fermentation. In order for this material to be fermented it has to be broken down in to simple sugars using hydrolysis. One method of hydrolysis is called dilute-acid hydrolysis, whereby low concentrations of acid are added to the …
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Engineering antimicrobial strains of saccharomyces cerevisiae as industrial platform for non-sterile bioprocesses
… contamination is a major challenge in fuel ethanol facilities, especially during the fermentation stage. Bacterial contaminants compete with yeast for fermentable sugars and nutrients, which obstructs starch to ethanol conversion. This leads to a reduction in ethanol yield. At large …
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Techno-economic evaluation of integrated process flowsheets for vinasse management with value addition for decision making
Bioethanol production through fermentation of sugarcane juice and its derivatives such as molasses is gaining popularity worldwide as focus shifts towards renewable energy production. However, ethanol fermentation results in the production of large volumes of a dark brown and low pH liquid waste …
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Enzymatic Enhancement of Water Removal In the Dry Grind Corn to Ethanol Process
The removal of water from coproducts in the fuel ethanol process requires a significant energy input. The drying of the coproducts is responsible for as much as 32% of the total utilities cost of the process. In this study, improvements in the energy and water balances of the corn to ethanol …