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 83 for “"first-order kinetics"”.
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A kinetic study of the base catalyzed ring opening of 9-methylcaffeine halide and its homologs
<p>This study provides information about the kinetics of the hydrolytic ring cleavage of imidazolium compounds and the catalytic effect of micelles in this ring cleavage. 9-Methylcaffeine iodide was synthesized and its base catalyzed ring cleavage was studied. The ring cleavage, via alkaline …
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Sediment Oxygen Demand Kinetics
… experiments, was performed to investigate SOD kinetics in Carvin's Cove Reservoir, a eutrophic water supply reservoir for Roanoke, Virginia. A bubble-plume diffuser is used in Carvin's Cove to replenish oxygen consumed while the reservoir is thermally stratified. The applicability of …
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Anaerobic biodegradation of selected organic compounds with and without inhibition of sulfate reducing bacteria
… soil. MTBE biodegradation was slow and followed first order kinetics with respect to initial concentration. Molybdate had no affect on MTBE biodegradation alone, but increased the biodegradation rate in MTBE microcosms which were amended with ethanol. Toluene, phenol, and 2,4-dichlorophenol …
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DRUG RELEASE FROM LIQUID FILLED CAPSULE FORMULATIONS
… load, where drug release was better described by first-order kinetics, release profiles were described reasonably well by diffusional models. The effects of the experimental variables are discussed in relation to diffusional models. The ibuprofen formulations exhibited complex behaviour during …
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Blockade of Acetylcholine Receptors by Cobra Toxin Electrophysiology and Pharmacology
… toxin irreversibly inactivated receptors with first-order kinetics. The rate constant for inactivation increased linearly with the toxin concentration near the receptors. Micro-ionophoretic application of two reversible agonists, ACh and carbamylcholine (Carb), focally protected receptors …
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The role of metals in enhanced biological phosphorus removal from wastewater
… Phosphorus release could be described by first order kinetics. Phosphorus uptake under aerobic conditions could also be described by first order kinetics. The total phosphorus uptake in the anoxic and aerobic zones of the experimental systems was proportional to the total phosphorus …
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Kinetics of DCOD Consumption by Bacterial Suspensions
The aim of this investigation was to study the kinetics of readily biodegradable soluble substrate, and the interactions between the bioflocculation process and such kinetics. Several batch test experiments were performed at different soluble-substratebiomass ratios in order to evaluate its impact …
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The oxidation of secondary alcohols by dipotassium tetraoxoferrate (VI) In concentrated and dilute potassium hydroxide solutions
… fluoride. The reactions were found to obey pseudofirst order kinetics and shown to be first order in ferrate ion and first order in alkoxy i on (ionized carbinol or alcohol); acetone production I from the oxidation of propanol-2 al so followed first order kinetics; oxygen evolution was 3/2 order· …
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Kinetic Analysis of High Affinity Polyclonal Anti-Fluorescyl Immunoglobulin-G Antibodies
… and assessment of association and dissociation kinetics in anti-fluorescyl antibodies were developed in these studies. An analytic procedure for the characterization of heterogeneous first order kinetics was derived. This procedure was based on Laplace transformation of the gamma distribution …
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Low temperature electron irradiation and annealing of pure cadmium
… dose-dependence, but it is better described by first order kinetics; this peak is believed to correspond to the long- range migration of the self-interstitial, preferentially to impurities where they form clusters. It has been found that subthreshold irradiation results in the annealing of …
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Kinetics of the electrocoagulation of oil and grease
… mg l-1. It was confirmed that EC of HEM follows first-order kinetics, and kinetic constants of 0.0441 s-1 and 0.0443 s-1 were obtained from applying both the dispersion and tanks-in-series (TIS) models, respectively. In both cases R2 was 0.97. Also, the TIS model indicated that each cell of the …
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DEGRADATION OF CARBON TETRACHLORIDE USING HYDROPHOBIC GREEN RUST
… to Green Rust II, an inorganic form of GR. The kinetics of GR reductive dechlorination of carbon tetrachloride (CT) was investigated. CT at high concentrations was degraded at high percentages for GRBIS-3, 88.5% and GRSNLS-5, 97.6%. Their reactions were found to follow pseudo first-order …
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The kinetics and induced decomposition on the thermal decomposition of hydroperoxides /
… hydroperoxide indicate that these reactions have first-order kinetics with activation energies on the order of 20 to 28 K cal/mole, Styrene was used as a free radical trap to inhibit the induced decomposition. The results permitted calculation of how much induced decomposition occurred in its …
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Adsorption kinetics for the removal of soluble manganese by oxide- coated filter media
This study was conducted to examine the kinetics of manganese sorption on oxide-coated filter media. Initial experimentation confirmed the findings of other investigators, the Mn²⁺ sorption capacity of oxide-coated media increases as solution pH increases. Further study revealed that uptake rate …
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Influence of nutrients on the biological phosphorus removal process at high acetate concentrations
… systems was used for batch tests determining the kinetics of phosphorus release and uptake and poly-β-hydroxybutyric acid synthesis. Furthermore, the influence of various nutrients were examined during these batch tests. The results of this study confirmed the observations of Randall and Chapin …
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Development of LDPE-based antimicrobial films for food packaging
… and long-term migration equations and by first order kinetics. Furthermore, the polymer additives PEG and EVA play a role in controlling the release of the AM agents. The incorporation of AM agent does not adversely affect the mechanical or optical properties of the extruded LDPE/EVA film …
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Approaches to modeling pathogen and natural organic matter removals in slow-rate biofilters
… based on biological processes in SRBFs following first order kinetics as a function of filter residence time. This makes the above natural organic matter model directly proportional to the amount of biologically degradable dissolved organic carbon available in a given source water and filter. …
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Mechanistic tracer studies of a synthetic mica-montmorillonite: n-butene isomerizations
… The isomerization reaction appears to follow first order kinetics. The existence of a significant isotope effect intimates that carbon-hydrogen bond cleavage occurs in the rate determining step of the reaction sequence. Bronsted type acid sites appear to be responsible for the catalytic …
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\(Pyrococcus\) \( furiosus\) amylase as a Candidate Sterilisation Time-Temperature Integrator
… relevant assays and computational models. The kinetics and mechanism of thermal denaturation of Pyrococcus furiosus \(\alpha\)-amylase was determined through FT-IR, DSC and CD techniques. It was found that through thermal denaturation after the melting temperature (Tm), the enzyme unfolded by …
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Kinetics of the ferric sulphate leaching of sphalerite and sphalerite/pyrite mixtures : a study of the chemical leaching of base metal minerals under conditions similar to that of bio-leaching by thiobacilli
… the ferric leaching of the sphalerite. The first type was a shrinking-particle model in which there action was described by first order kinetics or an electrochemical mechanism. The second type included a mass transfer resistance in terms of a shrinking-core model described by half-order …
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