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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 25 for “"continuous flow system"”.
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A study of the effect of dilution rate on bacterial populations
… free swimmer population were noted. An aseptic continuous flow system proved of no great advantage over that which had ambient inoculation, however, slime production did not follow identical growth patterns in three identical growth vessels. Coulter counts were made on a pure culture of B. …
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ΑΝΑΛΥΤΙΚΕΣ ΕΦΑΡΜΟΓΕΣ ΜΟΡΙΑΚΗΣ ΕΚΠΟΜΠΗΣ ΑΠΟ ΚΟΙΛΟΤΗΤΑ
… DETECTOR HAS BEEN COUPLED TO AN AIR-SEGMENTED CONTINUOUS FLOW SYSTEM. THIAMINE AND SOME CEPHALOSPORINS HAVE BEEN DETERMINED SUCCESSFULLY IN PHARMACEUTICAL FORMULATIONS. THE SPECTRAL INTERFERENCE OF SULPHITE TO SULPHIDE HAS BEEN STUDIED AND A METHOD IS PROPOSED FOR THE DETERMINATION OF BOTH …
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Regrowth of E. coli and S. faecalis in treated sewage after chlorination in a continuous-flow reactor
… secondary-treated sewage effluent using a continuous flow system. Regrowth was evaluated at varying chlorine contact times and chlorine residuals. In addition, chemical and physical characteristics of the sewage were evaluated in relation to regrowth. The results showed that while a 99% …
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Increasing the Stability and Turnover Number of a Highly Active Iron Catalyst for the Asymmetric Transfer Hydrogenation of Ketones
… of the precatalyst for eventual use in a continuous flow system. The orthophenylene catalysts in Chapter 3 displayed lower activity due to the rigidity of the triphenylphosphine donor, which places a phenyl group into the active site of the catalyst. Despite this hindrance, one catalyst …
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Manual and Automated Measurement of the Chemical Oxygen Demand (COD) of Wastewaters
… A twofold requirement for an automated COD. system is outlined. Experiments with a commercial continuous flow system showed it to be unsuitable for the both requirements. Work with a hybrid part dioscrete, part continuous flow system is described. Some useful informations was gained but the …
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Mn(II) oxidation by HOCl in the presence of iron oxides: a catalyzing effect
… removal mechanisms for a typical groundwater system to determine the necessary experimental conditions required to isolate the study of Mn(II) oxidation in the presence of ferric hydroxides/oxides (Fe(OH)₃<sub>(s)</sub>). (2) To investigate the means by which ferric hydroxides/oxides …
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Wastewater Disinfection with HYDROFLOW Technology
… of wastewater treatment to maintain healthy ecosystems. Although chlorination is the most prevalent wastewater disinfection method, there are serious safety concerns and ecological problems associated with its use. The purpose of this study was to test the feasibility of using a HydroFLOW 60i …
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The Isotopic Composition of Water Vapor in the Upper Troposphere/Lower Stratosphere Region : Modeling, Analysis and Sampling
… it consists of three instruments: a continuous-flow system for the chemical decomposition of $H_2O$ to $H_2$ and $O_2$ for subsequent mass-spectrometrical analysis, a calibration unit for the production of water vapor with known isotopic composition, and a cryogenic sampling unit for …
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Microfluidic reactors for the synthesis of nanocrystals
… excellent stability and reproducibility of the continuous flow system was also demonstrated. However, a limitation of the single-phase flow approach was that slow mixing and large residence time distributions can be detrimental to the overall quality (eg. size distribution) of the NC samples …
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Magnetic forces for surface-based bioanalysis in microfluidic devices
… an urgent demand for high through-put analysis systems that are rapid, simple to use and can be utilised in the field or at the point-of-care. Microfluidic technology has gone some way to producing such systems, however many of the current devices still incorporate batch methods of analysis, …
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Degradação microbiana de ácido cítrico em solo contaminado por chumbo
… of C-CO₂ soil in 0.1 M NaOH solution under a continuous flow system of air. We used a completely randomized design with three replications. Treatments were arranged in a factorial 3 x 2 x 4 + 3, corresponding to three state soil (contaminated, contaminated subjected to liming on the field and …
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The microbiology of diabetic foot infections: a Ghanaian perspective
… High-Throughput assays and the Quasi–Vivo® continuous flow system, K. pneumoniae and P. mirabilis were found to be positive for acyl–homoserine lactone production, biofilm and persister cell producers and could resist and/or tolerate antibiotics such as ceftazidime and levofloxacin up to …
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Metabolic regulation of denitrification in the opportunistic pathogen Pseudomonas aeruginosa
… in a polymicrobial community using an in vitro continuous-flow system developed in the Welch laboratory with subsequent analysis using a Lotka-Volterra competition model. This analysis revealed that denitrification mutants are considerably less “tolerant” towards competing species and begin to …
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The Microbubble Assisted Bioremediation of Chlorinated Ethenes
… all the way to ethene and ethane. A continuous flow system, consisting of six anaerobic soil column bioreactors, inoculated with sediments from Virginia Tech's Duck Pond, was used for this study. Two columns received microbubbles containing hydrogen and carbon dioxide, two received …
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Advanced Biofilm and Aerobic Granulation Technologies for Water and Wastewater Treatment
… formed in sequential batch reactors but not in a continuous flow system. Therefore, continuous flow aerobic granulation from traditional activated sludge was investigated and, for the first time, successfully achieved in continuous flow plug-flow bioreactors fed with real municipal wastewater. …
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A study of the vapour phase pyrolysis and alkaline hydrolysis of chloroform
… of chloroform at 510˚C was investigated in a continuous flow system, using nitrogen as the carrier gas. The main products of the reaction were hydrogen chloride, tetrachloroethylene, pentachloroethane and hexachloroethane; hydrogen and chlorine could not be detected. Neither the addition of a …
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Ozonation Systems as a Non-Chemical Alternative for Stored Grain Protection
… demonstrations using a fixed bed ozonation system and developing a semi-continuous counterflow and a continuous flow ozonation treatment system. The objectives of this research were to determine the efficacy of ozonation to control insect pests without affecting end-use quality; to prove the …
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Loss of LasR function reshapes inter-species interactions in a polymicrobial cystic fibrosis airway model
… of anti-pseudomonal drugs on a polymicrobial ecosystem populated by a representative selection of CF-associated microbes. To do this, I utilise an in vitro continuous-flow system that faithfully captures many of the microbial dynamics seen in CF patients. Using artificial sputum medium, this …
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Investigation on Factors Influencing Ultrasound-assisted Surface Decontamination of Fresh and Fresh-cut Vegetables
… fresh-cut vegetable surfaces. In this study, a systematic approach, starting from understanding the interactions among acoustic energy, produce, sanitizers, and bacteria, as well as the distribution of the ultrasonic field in the treatment channel, was employed to find the answer to the …
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Groundwater flow in part of the Little Missouri River Basin, North Dakota
… sediments. An evaluation of the groundwater flow in part of this valley was 'based on the present groundwater flow-system models. Abrupt changes in the hydrochemical facies have been explained relative to a continuous flow system. </p><p> The Little Missouri valley ls the discharge area of a …
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