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 20 of 21 for “"initial rates"”.
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Ammonia assimilation by Ruminococcus flavefaciens FD-1
… prepared similarly depleted ammonia from media (initial rates of 11.2 and 0.8 nmol$\cdot$min$\sp{-1}{\cdot}$mg$\sp{-1}$ protein for cells grown with limiting nitrogen and carbon, respectively).
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Allostery and GroEL: Exploring the Tenets of Nested Cooperativity
… accounts for the effects of these ligands. Initial studies take advantage of a single ring variant, termed SR1, to examine the allosteric properties of GroEL in the absence of complicating interactions arising from negative cooperativity. Initial rates of ATP hydrolysis by GroEL and SR1 as a …
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Hydrogen Peroxide Inhibition and Inactivation of Bicupin Oxalate Oxidase
… spectrometry (MIMS) was used to directly measure initial rates of carbon dioxide formation and oxygen consumption in varying initial concentrations of hydrogen peroxide. This work demonstrates that hydrogen peroxide is both a reversible noncompetitive inhibitor of the CsOxOx catalyzed oxidation of …
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Bioreduction of Hematite Nanoparticles by Shewanella oneidensis MR-1
… effects, the surface area normalized reduction rates of hematite nanoparticles by S. oneidensis MR-1 with lactate as the sole electron donor were measured. As evident from whole cell TEM analysis, the mode of nanoparticle adhesion to cells is different between the more aggregated, …
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Yield, chemical composition, digestibility and palatibility of orchardgrass (Dactylis glomerata L.) fertilized with different levels of nitrogen and sulphur
The effects of three fertilization rates of N (0, 112 and 224 kg/ha) as ammonium nitrate and S (0, 34, and 67 kg/ha) as calcium sulphate on yield, chemical composition, digestibility and palatability of orchardgrass (Dactylis glomerata L.) , were studied in a field experiment. Treatments were …
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The effect of alternative electron acceptors on the subsurface biodegradation rates of methanol and tertiary-butyl alcohol
… addition of nitrate resulted in increases in the initial rates of degradation of methanol ranging from 20 to 1040 percent. After a period of time, however, an inhibitory build-up of nitrite generally occurred, essentially halting the biodegradation. The addition of nitrate resulted in a varied …
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Borenium Cations as Catalysts for the Reduction of Organic Molecules and Mechanistic Investigations into their Mode of Operation
… to catalytically reduce a wide array of substrates including imines, N-heterocycles, nitriles, and ketones using pinacol borane as the source of hydride. Another borenium ion, synthesized from trityl tetrakis-pentafluorophenyl borate, DABCO, and HBpin did not contain a nucleophilic borohydride …
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Studies of Coagulation and Fibrinolysis
… fit the data better, as well as predict the initial rates of prothrombin activation better than the one-form model, and thus better represents the mechanism of prothrombinase on prothrombin activation. Second, the differences observed in the activation kinetics of prethrombin-1 by …
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The ultra-selective hydrogenation of Furfural on PtCu supported bimetallic nanoparticles and on Pt(111) under ultra-high vacuum
… overall catalytic activity by providing superior initial rates of reaction and catalytic turnover, as well as achieving high selectivities towards furfuryl alcohol, surpassing the behaviour of pure Pt catalyst across 3 different pressures. Finally, Single Atom Alloys (SAA), formed via the galvanic …
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Local exposure and efficacy of a reservoir-based drug delivery device
… Cima Lab. In vitro experiments confirmed linear initial rates of release of temozolomide, an alkylating agent, and doxorubicin, a topoisomerase inhibitor, from the microcapsules. In vivo survival studies were conducted to compare the efficacies of these microcapsules against 9L rat gliosarcoma …
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Studies of the Coordination Chemistry and Catalytic Activity of Rhodium and Ruthenium N-Heterocyclic Carbene Complexes
… donate electron density to the empty * orbital. Initial investigations of these complexes as catalysts for the reduction and oxidation of C-O bonds, as well as singlet oxygen generation were also undertaken. Rh(IPr)2 coordination complexes of N2, H2 and CO were also synthesized and characterized …
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Health, health insurance coverage, health care service utilization and family structure among children of immigrants
… and medical care over time despite their lower initial rates of care use, compared to children of U.S.-born married parents. Although first-generation children with single parents had lower initial status of dental checkups as well, their rates of change in care use did not significantly …
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Kinetics reactions of Ammonium Nitrate-Sodium Nitrite Reaction and Ammonium Nitrate Emulsion Explosives
… was to understand and control the gasification rates in ammonium nitrate emulsion explosive using ammonium nitrate-sodium nitrite reaction. This reaction produces N2 gas which is the sensitizer in emulsion explosives. The NH4NO3-NaNO2 gassing reaction produces N2 gas and so the reaction could be …
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The oxidative reforming of methane to synthesis gas on a commercial steam reforming catalyst
… Having obtained differential reaction rates from the integral data, two LangmuirHinshelwood models were developed and fitted to the data. The model which was derived from the assumption that methane adsorption on a single active site was the rate-determining step, gave the best fit to …
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An investigation into the ferric leaching of chalcopyrite : a sub-process in the bioleaching of chalcopyrite
… adopted by our research group to determine the initial rates of chalcopyrite leaching. Preliminary rates of chalcopyrite leaching were presented in the thesis by Furamera (2000). Further work was required to firmly establish the rates of chalcopyrite leaching and the optimal redox potential …
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Renewable Natural Polymer Thin Films and Their Interactions with Biomacromolecules
… (MnP). Results from QCM-D showed that the initial rates for degradation catalyzed by LiP increased in the order: KL < OL < MWL < guaiacyl DHP (G-DHP) < p-hydroxyphenyl DHP (H-DHP). In contrast, manganese peroxidase only degraded DHP films with a faster initial rate for G-DHP than H-DHP. …
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Isothermal microwave biology : catalysis and fermentation
… in an aqueous environment can increase both the initial enzyme rate and the saccharification yield without alteration of the temperature set point. This study shows that the rate increase is not proportional to the microwave field power. An optimal power in each study is either found or …
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Magnetic resonance imaging studies of cardiac changes in diabetic and hypertensive rats
… contraction and relaxation through the initial rates of left and right ventricular ejection and filling and by plotting such rates, dV/dt, through the studied twelve timepoints through the cardiac cycle. The MRI measurements yielded consistent myocardial volumes in both ventricles …
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Promotion of Heterogeneous Acid and Base Catalysts for Biomass Upgrading
… reactions useful in converting bio-based substrates to existing and novel chemicals; however, the costly separations associated with homogeneous catalysts have necessitated the study of solids with similar properties to fulfill the same role. Indeed, many natural or synthetic solid materials …
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Dynamics of internal nutrient loading in a eutrophic, polymictic lake (Lake Rotorua, New Zealand)
… bloom formation. Sediment nutrient release rates of phosphorus (P) in Lake Rotorua were estimated from changes in bottom water P concentration during a 19-day summer stratification event in February 2003. Changes in mass of hypolimnion P due to mixing events, together with settling, inflows, …
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