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Articles 541 - 570 of 759
Full-Text Articles in Chemical Engineering
Simulation Of Dna Extension In Nanochannels, Yanwei Wang, Douglas R. Tree, Kevin D. Dorfman
Simulation Of Dna Extension In Nanochannels, Yanwei Wang, Douglas R. Tree, Kevin D. Dorfman
Faculty Publications
We have used a realistic model for double-stranded DNA and Monte Carlo simulations to compute the extension (mean span) of a DNA molecule confined in a nanochannel over the full range of confinement in a high ionic strength buffer. The simulation data for square nanochannels resolve the apparent contradiction between prior simulation studies and the predictions from Flory theory, demonstrating the existence of two transition regimes between weak confinement (the de Gennes regime) and strong confinement (the Odijk regime). The simulation data for rectangular nanochannels support the use of the geometric mean for mapping data obtained in rectangular channels onto …
Desorption Kinetics Of An Alternative Monoethanolamine Based Co2 Capture Process, Morris D. Argyle, Zhuoyan Sun, Maohong Fan
Desorption Kinetics Of An Alternative Monoethanolamine Based Co2 Capture Process, Morris D. Argyle, Zhuoyan Sun, Maohong Fan
Faculty Publications
Supported monoethanolamine (MEA) sorbents are promising materials for CO2 separation due to their low energy demands. Like any other CO2 separation technologies, CO2 desorption from supported MEA sorbents is the most energy-expensive step in the overall CO2 separation process. The presence of water during CO2 desorption process leads to a significant increase in energy consumption. Therefore, CO2 desorption in the absence of water is an important method to reduce energy consumption of CO2 separation using supported MEA, which is determined by several major factors, including desorption kinetics. However, study on CO2 desorption kinetics of supported MEA is lacking. This research …
Eddy Impaction As An Ash Deposition Mechanism: A Theoretical And Experimental Investigation, Minmin Li
Eddy Impaction As An Ash Deposition Mechanism: A Theoretical And Experimental Investigation, Minmin Li
Theses and Dissertations
The eddy impaction ash deposition model derived and validated in this document predicts eddy impaction rates as a function of turbulence intensity, boundary layer thickness, and gas velocity. The experimental apparatus introduces small particles (200 nm, 25 µm, and 500 µm diameter) into a gas stream flowing through a horizontal pipe (Re 2,300-8,000). The particles deposit on the pipe wall and the total mass of impacted particles provides a measure of collection efficiency. Experimental results indicate deposition velocity increases with Reynolds number, consistent with eddy impaction theory and based on increased turbulent energy. Eddy impaction also increases with particle size …
Prediction Of Fluid Dielectric Constants, Jiangping Liu
Prediction Of Fluid Dielectric Constants, Jiangping Liu
Theses and Dissertations
The dielectric constant or relative static permittivity of a material represents the capacitance of the material relative to a vacuum and is important in many industrial applications. Nevertheless, accurate experimental values are often unavailable and current prediction methods lack accuracy and are often unreliable. A new QSPR (quantitative structure-property relation) correlation of dielectric constant for pure organic chemicals is developed and tested. The average absolute percent error is expected to be less than 3% when applied to hydrocarbons and non-polar compounds and less than 18% when applied to polar compounds with dielectric constant values ranging from 1.0 to 50.0. A …
Failing Drop Co2 Deposition (Desublimation) Heat Exchanger For The Cryogenic Carbon Capture Process, David William James
Failing Drop Co2 Deposition (Desublimation) Heat Exchanger For The Cryogenic Carbon Capture Process, David William James
Theses and Dissertations
Cryogenic carbon capture removes CO2 and other pollutants from flue and waste stream gases produced from the combustion of fossil fuels such as coal, natural gas, and oil and the production of cement. A transient, 1-dimensional numerical model was developed to study the temperature profile within a counter-current surface CO2 desublimation-falling liquid or solid heat exchanger. Effects of desublimation heat and mass transfer as well as convective and conductive heat transfer relationships were taken into account. Experiments show that CO2 can be captured on a falling spherical particle when appropriate column operating conditions are met.
Microstructure And Transport Properties Of Porous Li-Ion Electrodes, David E. Stephenson
Microstructure And Transport Properties Of Porous Li-Ion Electrodes, David E. Stephenson
Theses and Dissertations
The goal of this work is to understand the relationships between electrode microstructure and mass transport resistances. One can use this information to predict cell performance from fundamental principles. This work includes new types of particle-scale 3D models for correlating and predicting the effects of electrode microstructure on both ionic and electronic transport. The 3D models imitate the sub-micrometer-scale arrangement of active material particles, carbon, binder, and pores and use FIB/SEM images as a basis for parameterization. The 3D models are based respectively on the statistical mechanics techniques of molecular dynamics and Monte Carlo. The approach closely related to molecular …
Thermodynamics Of Dna Hybridization On Surfaces, Terry J. Schmitt, Thomas A. Knotts Iv
Thermodynamics Of Dna Hybridization On Surfaces, Terry J. Schmitt, Thomas A. Knotts Iv
Faculty Publications
Hybridization of single-stranded DNA (ssDNA) targets to surface-tethered ssDNA probes was simulated using an advanced coarse-grain model to identify key factors that influence the accuracy of DNA microarrays. Comparing behavior in the bulk and on the surface showed, contrary to previous assumptions, that hybridization on surfaces is more thermodynamically favorable than in the bulk. In addition, the effects of stretching or compressing the probe strand were investigated as a model system to test the hypothesis that improving surface hybridization will improve microarray performance. The results in this regard indicate that selectivity can be increased by reducing overall sensitivity by a …
Effects Of Tethering A Multistate Folding Protein To A Surface, Shuai Wei, Thomas A. Knotts Iv
Effects Of Tethering A Multistate Folding Protein To A Surface, Shuai Wei, Thomas A. Knotts Iv
Faculty Publications
Protein/surface interactions are important in a variety of fields and devices, yet fundamental understanding of the relevant phenomena remains fragmented due to resolution limitations of experimental techniques. Molecular simulation has provided useful answers, but such studies have focused on proteins that fold through a two-state process. This study uses simulation to show how surfaces can affect proteins which fold through a multistate process by investigating the folding mechanism of lysozyme (PDB ID: 7LZM). The results demonstrate that in the bulk 7LZM folds through a process with four stable states: the folded state, the unfolded state, and two stable intermediates. The …
Fluxes Across Double-Diffusive Interfaces: A One-Dimensional-Turbulence Study, Esteban Gonzalez-Juez, Alan R. Kerstein, David O. Lignell
Fluxes Across Double-Diffusive Interfaces: A One-Dimensional-Turbulence Study, Esteban Gonzalez-Juez, Alan R. Kerstein, David O. Lignell
Faculty Publications
This work is a parametric study of the fluxes of heat and salt across unsheared and sheared double-diffusive interfaces using one-dimensional-turbulence (ODT) simulations. It is motivated by the need to understand how these fluxes scale with parameters related to the fluid molecular properties and background shear. Comparisons are made throughout with previous models and available measurements. In unsheared interfaces, ODT simulations show that the dimensionless heat flux Nu scales with the stability parameter Rρ, Rayleigh number Ra and Prandtl number Pr as Nu ~ (Ra/Rρ)0.37±0.03 when Pr varies from 3 to 100 and as Nu ~ (Ra/Rρ)0.31Pr0.22±0.04 when Pr varies …
Chemical Potential Perturbation: A Method To Predict Chemical Potentials In Periodic Molecular Simulations, Stan G. Moore, Dean R. Wheeler
Chemical Potential Perturbation: A Method To Predict Chemical Potentials In Periodic Molecular Simulations, Stan G. Moore, Dean R. Wheeler
Faculty Publications
A new method, called chemical potential perturbation (CPP), has been developed to predict the chemical potential as a function of density in periodic molecular simulations. The CPP method applies a spatially varying external force field to the simulation, causing the density to depend upon position in the simulation cell. Following equilibration the homogeneous (uniform or bulk) chemical potential as a function of density can be determined relative to some reference state after correcting for the effects of the inhomogeneity of the system. We compare three different methods of approximating this correction. The first method uses the van der Waals density …
Pyrolysis Kinetics And Chemical Structure Considerations Of A Green River Oil Shale And Its Derivatives, James L. Hillier
Pyrolysis Kinetics And Chemical Structure Considerations Of A Green River Oil Shale And Its Derivatives, James L. Hillier
Theses and Dissertations
This work had the objective of determining both the kinetic parameters for the pyrolysis of oil shale and kerogen as well as using analytical techniques coupled with pyrolysis to shed light on the structure of a specific Green River oil shale. Because of the problems with linearized methods and disagreement among literature values and methods, a new method was developed tofit kinetic parameters to non linearized data. The method was demonstrated to determine the "correct" answer for mathematically generated data within a few percent error and was shown to have a lower sum squared error than the linearized methods. The …
Sawdust Pyrolysis And Petroleum Coke Co2 Gasification At High Heating Rates, Aaron D. Lewis
Sawdust Pyrolysis And Petroleum Coke Co2 Gasification At High Heating Rates, Aaron D. Lewis
Theses and Dissertations
Clean and efficient electricity can be generated using an Integrated Gasification Combined Cycle (IGCC). Although IGCC is typically used with coal, it can also be used to gasify other carbonaceous species like biomass and petroleum coke. It is important to understand the pyrolysis and gasification of these species in order to design commercial gasifiers and also to determine optimal conditions for operation. High heating-rate (100,000 K/s) pyrolysis experiments were performed with biomass (sawdust) in BYU's atmospheric flat-flame burner reactor at conditions ranging from 1163 to 1433 K with particle residence times ranging from 23 to 102 ms. Volatile yields and …
Effects Of Damköhler Number On Flame Extinction And Reignition In Turbulent Non-Premixed Flames Using Dns, David O. Lignell, Jacqueline H. Chen, Hans A. Schmutz
Effects Of Damköhler Number On Flame Extinction And Reignition In Turbulent Non-Premixed Flames Using Dns, David O. Lignell, Jacqueline H. Chen, Hans A. Schmutz
Faculty Publications
Results from a parametric study of flame extinction and reignition with varying Damköhler number using direct numerical simulation are presented. Three planar, non-premixed ethylene jet flames were simulated at a constant Reynolds number of 5120. The fuel and oxidizer stream compositions were varied to adjust the steady laminar extinction scalar dissipation rate, while maintaining constant flow and geometric conditions. Peak flame extinction varies from approximately 40% to nearly global blowout as the Damköhler number decreases. The degree of extinction significantly affects the development of the jets and the degree of mixing of fuel, oxidizer, and combustion products prior to reignition. …
Cobalt Fischer-Tropsch Catalyst Preparation: Overview Of Preparation Techniques On Alumina Pellets, Brad M. Hancock, Kari M. Cook, William C. Hecker
Cobalt Fischer-Tropsch Catalyst Preparation: Overview Of Preparation Techniques On Alumina Pellets, Brad M. Hancock, Kari M. Cook, William C. Hecker
Student Works
Fischer-Tropsch (FT) synthesis is a reaction used to convert carbon monoxide and hydrogen into high-quality liquid fuels. The FT process has been considered a promising alternative route for producing diesel fuel to meet an increasing demand for oil around the world and more strict limits to regulate auto tailpipe emissions. The U.S. Environmental Protection Agency has demanded a reduction in diesel fuel sulfur content to 15 ppm. While crude oil contains finite amounts of sulfur that needs further removal or treatment before it could be used as a commercial fuel, FT synthesis produces sulfur-free diesel fuel. The reaction takes place …
Thermodynamic, Sulfide, Redox Potential, And Ph Effects On Syngas Fermentation, Peng Hu
Thermodynamic, Sulfide, Redox Potential, And Ph Effects On Syngas Fermentation, Peng Hu
Theses and Dissertations
Recently, work in ethanol production is exploring the fermentation of syngas (primarily CO, CO2, and H2) following gasification of cellulosic biomass. The syngas fermentation by clostridium microbes utilizes the Wood-Ljungdahl metabolic pathway. Along this pathway, the intermediate Acetyl-CoA typically diverges to produce ethanol, acetic acid, and/or cell mass. To develop strategies for process optimization, a thermodynamic analysis was conducted that provided a detailed understanding of the favorability of the reactions along the metabolic pathway. Thermodynamic analysis provided identification of potentially limiting steps. Once these limiting reactions were identified, further thermodynamic analysis provided additional insights into the ways in which reaction …
The Use Of Two-Phase Molecular Dynamics Simulations To Determine The Phase Behavior And Critical Point Of Propane Molecular Models, Sonal Patel, W. Vincent Wilding, Richard L. Rowley
The Use Of Two-Phase Molecular Dynamics Simulations To Determine The Phase Behavior And Critical Point Of Propane Molecular Models, Sonal Patel, W. Vincent Wilding, Richard L. Rowley
Faculty Publications
Molecular dynamics simulations were performed to determine two-phase configurations of model propane molecules below the critical point and in the near-critical, two-phase region. A postprocessor that uses a Monte Carlo method for determination of volumes attributable to each molecule was used to obtain density histograms of the particles from which the bulk coexisting equilibrium vapor and liquid densities were determined. This method of analyzing coexisting densities in a two-phase simulation is straightforward and can be easily implemented for complex, multisite models. Various degrees of internal flexibility in the propane models have little effect on the coexisting densities at temperatures 40 …
Pyrolysis Kinetics Of A Green River Oil Shale Using A Pressurized Tga, James L. Hillier, Thomas H. Fletcher
Pyrolysis Kinetics Of A Green River Oil Shale Using A Pressurized Tga, James L. Hillier, Thomas H. Fletcher
Faculty Publications
Crushed samples of Green River Oil Shale and its kerogen extract were pyrolyzed at heating rates from 1 to 10 K/min at pressures of 1 and 40 bar and temperatures up to 1000 C. Two to four mass release peaks were observed with the major two corresponding to kerogen pyrolysis and carbonate decomposition. The transient pyrolysis data were fit with a first-order model and a Distributed Activation Energy Model (DAEM). An F-test was used to determine confidence regions and compare the kinetic parameters among the oil shale and demineralized samples, between the two pressure levels, and between the models. The …
Effect Of Particle Size And Trench Configuration On Deposition From Fine Coal Flyash Near Film Cooling Holes, Weiguo Ai, Robert G. Laycock, Devin Rappleye, Thomas H. Fletcher
Effect Of Particle Size And Trench Configuration On Deposition From Fine Coal Flyash Near Film Cooling Holes, Weiguo Ai, Robert G. Laycock, Devin Rappleye, Thomas H. Fletcher
Faculty Publications
Particulate deposition experiments were performed in a turbine accelerated deposition facility to examine the effects of flyash particle size and trench configuration on deposits near film cooling holes. Deposition on two bare metal Inconel coupons was studied, with hole spacings (s/d) of 3.4 and 4.5. Two sizes of sub-bituminous coal ash particles were used, with mass mean diameter of 4 and 13 μm, respectively. The effect of a cooling trench at the exit of the cooling holes was also examined in this deposition facility. Experiments were performed at different angles of impaction. Particles were accelerated to a combustor exit flow …
Film Cooling Effectiveness And Heat Transfer Near Deposit-Laden Film Holes, Scott Lewis, Brett Barker, Jeffrey P. Bons, Weiguo Ai, Thomas H. Fletcher
Film Cooling Effectiveness And Heat Transfer Near Deposit-Laden Film Holes, Scott Lewis, Brett Barker, Jeffrey P. Bons, Weiguo Ai, Thomas H. Fletcher
Faculty Publications
Experiments were conducted to determine the impact of synfuel deposits on film cooling effectiveness and heat transfer. Scaled up models were made of synfuel deposits formed on film-cooled turbine blade coupons exposed to accelerated deposition. Three distinct deposition patterns were modeled: a large deposition pattern (maximum deposit peak = 2 hole diameters) located exclusively upstream of the holes, a large deposition pattern (maximum deposit peak = 1.25 hole diameters) extending downstream between the cooling holes, and a small deposition pattern (maximum deposit peak = 0.75 hole diameter) also extending downstream between the cooling holes. The models featured cylindrical holes inclined …
Investigation Of An Iron-Based Additive On Coal Pyrolysis And Char Oxidation At High Heating Rates, John M. Sowa, Thomas H. Fletcher
Investigation Of An Iron-Based Additive On Coal Pyrolysis And Char Oxidation At High Heating Rates, John M. Sowa, Thomas H. Fletcher
Faculty Publications
Iron-based catalysts have been shown to enhance coal pyrolysis and char oxidation at low to moderate temperatures and heating rates (b1250 K and 1–1000 K/s). Such catalytic activity has not been demonstrated at high heating rates and temperatures approaching pulverized coal combustion applications. The effect of an iron-based additive on coal pyrolysis and char combustion was studied in a flat-flame burner system at high particle heating rates using a Kentucky bituminous coal. Pyrolysis and char reactivity of two treated coals with different catalyst loadings were studied and compared with the untreated coal. The total volatiles yield for the treated coals …
Coal Swelling Model For High Heating Rate Pyrolysis Applications, Randy C. Shurtz, Kolbein K. Kolste, Thomas H. Fletcher
Coal Swelling Model For High Heating Rate Pyrolysis Applications, Randy C. Shurtz, Kolbein K. Kolste, Thomas H. Fletcher
Faculty Publications
Thermal swelling of coal during pyrolysis strongly influences combustion and gasification rates. Coal swelling is known to vary strongly with coal rank, heating rate, and total pressure. New experiments confirm and clarify previous observations that maximum swelling occurs for high-rank bituminous coals at heating rates slightly below 104 K/s. Advanced swelling models based on bubble physics yield good qualitative trends at low heating rates, but they fail to predict observed decreases in coal swelling as particle heating rates increase beyond 104 K/s. An empirical swelling correlation for computational fluid dynamics (CFD) applications that correctly describes experimentally observed trends …
The Effects Of Wind On The Flame Characteristics Of Individual Leaves, Wesley J. Cole, Mckaye H. Dennis, Thomas H. Fletcher, David R. Weise
The Effects Of Wind On The Flame Characteristics Of Individual Leaves, Wesley J. Cole, Mckaye H. Dennis, Thomas H. Fletcher, David R. Weise
Faculty Publications
Individual cuttings from five shrub species were burned over a flat-flame burner under wind conditions of 0.75–2.80m s-1. Both live and dead cuttings were used. These included single leaves from broadleaf species as well as 3 to 5 cm-long branches from coniferous and small broadleaf species. Flame angles and flame lengths were determined by semi-automated measurements of video images. Additional data, such as times and temperatures corresponding to ignition, maximum flame height and burnout were determined using video and infrared images. Flame angles correlated linearly with wind velocity. They also correlated with the Froude number when either the …
Predicting Stability Of Alpha-Helical, Orthogonal-Bundle Proteins On Surfaces, Shuai Wei, Thomas A. Knotts
Predicting Stability Of Alpha-Helical, Orthogonal-Bundle Proteins On Surfaces, Shuai Wei, Thomas A. Knotts
Faculty Publications
The interaction of proteins with surfaces is a key phenomenon in many applications, but current understanding of the biophysics involved is lacking. At present, rational design of such emerging technologies is difficult as no methods or theories exist that correctly predict how surfaces influence protein behavior. Using molecular simulation and a coarse-grain model, this study illustrates for the first time that stability of proteins on surfaces can be correlated with tertiary structural elements for alpha-helical, orthogonal-bundle proteins. Results show that several factors contribute to stability on surfaces including the nature of the loop region where the tether is placed and …
The Structure And Stability Of Alpha-Helical, Orthogonal-Bundle Proteins On Surfaces, Shuai Wei
The Structure And Stability Of Alpha-Helical, Orthogonal-Bundle Proteins On Surfaces, Shuai Wei
Theses and Dissertations
The interaction of proteins with surfaces is a major problem involved in protein microarrays. Understanding protein/surface interactions is key to improving the performance of protein microarrays, but current understanding of the behavior of proteins on surfaces is lacking. Prevailing theories on the subject, which suggest that proteins should be stabilized when tethered to surfaces, do not explain the experimentally observed fact that proteins are often denatured on surfaces. In an attempt to develop some predictive capabilities with respect to protein/surface interactions, it was asked in previous works if the stabilization/destabilization of proteins on surfaces could be correlated to secondary structure …
Flammability Limits, Flash Points, And Their Consanguinity: Critical Analysis, Experimental Exploration, And Prediction, Jeffrey R. Rowley
Flammability Limits, Flash Points, And Their Consanguinity: Critical Analysis, Experimental Exploration, And Prediction, Jeffrey R. Rowley
Theses and Dissertations
Accurate flash point and flammability limit data are needed to design safe chemical processes. Unfortunately, improper data storage and reporting policies that disregard the temperature dependence of the flammability limit and the fundamental relationship between the flash point and the lower flammability limit have resulted in compilations filled with erroneous values. To establish a database of consistent flammability data, critical analysis of reported data, experimental investigation of the temperature dependence of the lower flammability limit, and theoretical and empirical exploration of the relationship between flash points and temperature limits are undertaken. Lower flammability limit measurements in a 12-L ASHRAE style …
Results And Analysis Of A Required Senior Exam To Assess Learning Of Course Competencies, Randy Lewis, Thomas Knotts, W. Vincent Wilding, William G. Pitt, Morris D. Argyle
Results And Analysis Of A Required Senior Exam To Assess Learning Of Course Competencies, Randy Lewis, Thomas Knotts, W. Vincent Wilding, William G. Pitt, Morris D. Argyle
Faculty Publications
As part of the ABET Accreditation Criterion, Program Outcomes refer to the outcomes that chemical engineering students should possess when they leave the university and enter the workforce. In 1999, as a response to ABET’s EC2000 criterion, a list of specific competencies was defined in the Chemical Engineering Program at Brigham Young University that, when taken together, constituted each Program Outcome. When the competencies were first developed, it became clear that the level of mastery expected from students varied from competency to competency. Exposure to the material was all that was required for some competencies. For others, it was our …
Results And Analysis Of A Required Senior Exam To Assess Learning Of Course Competencies, Randy Lewis, Thomas Knotts, W Vincent Wilding, William Pitt, Morris Argyle
Results And Analysis Of A Required Senior Exam To Assess Learning Of Course Competencies, Randy Lewis, Thomas Knotts, W Vincent Wilding, William Pitt, Morris Argyle
Faculty Publications
As part of the ABET Accreditation Criterion, Program Outcomes refer to the outcomes that chemical engineering students should possess when they leave the university and enter the workforce. In 1999, as a response to ABET’s EC2000 criterion, a list of specific competencies was defined in the Chemical Engineering Program at Brigham Young University that, when taken together, constituted each Program Outcome. When the competencies were first developed, it became clear that the level of mastery expected from students varied from competency to competency. Exposure to the material was all that was required for some competencies. For others, it was our …
High Temperature Water Gas Shift Catalysts With Alumina, Morris D. Argyle, Tiberiu Popa, Guoqing Xu, Thomas F. Barton
High Temperature Water Gas Shift Catalysts With Alumina, Morris D. Argyle, Tiberiu Popa, Guoqing Xu, Thomas F. Barton
Faculty Publications
Alumina (Al2O3) was added as a component of conventional iron oxide based high temperature water gas shift (WGS) catalysts. The catalysts contained Fe-Al-Cr-Cu-O and were synthesized by coprecipitation. A series of catalysts were prepared with 5 to 50 wt% Al2O3, 8 wt% Cr2O3, 4 wt% CuO, and the balance Fe2O3. One catalyst was prepared in which the chromia was replaced by alumina. All of the catalysts were compared to a reference WGS catalyst (88 wt% FeOX, 8 wt% Cr2O3, and 4 wt% CuO) with no alumina. The catalysts were characterized using temperature programmed reduction (TPR), surface area analysis using nitrogen …
Preliminary Results Of Combining Low Frequency Low Intensity Ultrasound And Liposomal Drug Delivery To Treat Tumors In Rats, William G. Pitt, Ghaleb A. Husseini, Beverly L. Roeder, David Dickinson, David Warden, Jonathan Hartley, Peter Jones
Preliminary Results Of Combining Low Frequency Low Intensity Ultrasound And Liposomal Drug Delivery To Treat Tumors In Rats, William G. Pitt, Ghaleb A. Husseini, Beverly L. Roeder, David Dickinson, David Warden, Jonathan Hartley, Peter Jones
Faculty Publications
Ultrasound is a convenient trigger for site-specific drug delivery in cancer therapy. Nanosized liposomes formulated from soy phosphatidyl choline, cholesterol, 1,2-distearoyl-sn-glycero3-phosphoethanolamine-N-[carboxy(polyethylene glycol)-2000] and alpha-tocopherol were loaded with Doxorubicin (Dox)using a pH gradient. The liposomal suspension was infused through the tail vein of BDIX rats possessing bilateral intradermal DHD/K12 tumors on their hind legs. Then 20-kHz ultrasound was applied to only one of the tumors for 15 minutes. This therapy was repeated weekly for 4 weeks. The results showed that in five of sixrats, the tumors regressed to non-measurable size within 4 weeks. A paired comparison of the normalized size of …
Syngas Fermentation: Quantification Of Assay Techniques, Reaction Kinetics, And Pressure Dependencies Of The Clostridial P11 Hydrogenase, Bradley E. Skidmore
Syngas Fermentation: Quantification Of Assay Techniques, Reaction Kinetics, And Pressure Dependencies Of The Clostridial P11 Hydrogenase, Bradley E. Skidmore
Theses and Dissertations
Ethanol usage as a transportation fuel is rapidly increasing in the United States. Production of ethanol from cellulose feedstocks via gasification followed by syngas fermentation offers an environmentally friendly approach that mitigates many of the adverse effects associated with production from corn. In the syngas fermentation process, the hydrogenase enzyme of the fermentation bacterium, Clostridium P11 for this work, supplies electrons to the metabolic pathway, facilitating ethanol production. In this thesis, an assay for P11 hydrogenase activity was developed. It was determined that 1) less than 4 minutes of sparging with 50 sccm H2 is needed to reduce O2 levels …