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 17 of 17 for “"pH indicator"”.
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Synthesis, Characterization, Properties and Computational Studies of Linear Boronate Diester-Linked Materials
… properties of boronates identified a terephthalic acid derivative as a novel pH indicator. The intensity and wavelength of both absorption and emission changed as the pH changed providing a sensitive ratiometric probe.
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Development of a method for quantitative imaging of air-water gas exchange
Using a fluorescent pH indicator (pyranine), a new measurement method to investigate the exchange of a soluble alkaline gas (ammonia) from air to water was developed. Key feature of the method is that a linear relationship between the concentrations of the dissolved gas and the alkaline form of the …
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Solvatochromic pyrogallarenes and pyrogallarene crystals
… cocrystal of C-propyl pyrogallol[4]arene and the pharmaceutical gabapentin has the potential to alter gabapentin's stability, bioavailability, and dissolution rate. During the cocrystallization process unusual chromogenic behavior was observed, which led to the isolation of crystal 1, C-propyl …
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DEVELOPMENT OF A RAPID DIAGNOSTIC ASSAY FOR THE COLORIMETRIC DETECTION OF LEGIONELLA BACTERIA USING LOOP MEDIATED ISOTHERMAL AMPLIFICATION
… DNA from <em>Legionella </em>was amplified the pH in the reaction decreased. The pH drop triggered a color change of a pH indicator present in the reaction. Some LAMP assays have been shown to detect as few as 10-12 copies of DNA in food or water samples. Colorimetric <em>Legionella </em>LAMP …
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Novel integrated paired emitter-detector diode flow analysis system
My PhD programme of research at the National Centre of Sensor Research has focussed on the development of a miniaturized detection system based on the concept of a Paired Emitter-Detector Diode (PEDD) LED optical sensor as a generic optical sensor platform for colorimetric analysis as developed …
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Development and assessment of new sensor systems in food packaging applications
… as these are key gases used in modified atmosphere packaging (MAP) of food. The first and second experimental chapters (chapter 2 and 3) describe the development of O2, pH and CO2 solid state sensors and its (potential) use for food packaging applications. A dual-analyte sensor for dissolved …
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RAPID COLORIMETRIC IDENTIFICATION OF ESCHERICHIA COLI SHIGA TOXINS 1 AND 2, AS WELL AS EAE AND AGGR, USING LOOP MEDIATED ISOTHERMAL AMPLIFICATION FOLLOWED BY PNA/AUNP DETECTION
… include using LAMP reaction buffer containing a pH indictor dye. This method allows for easy colorimetric detection of LAMP amplicons. If the target sequence was amplified, hydrogen ion release during phosphodiester bond formation will decrease the pH of the reaction. This causes the pH indicator …
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Synthesis and Characterization of Miniaturized Fluorescence Sensors for Aqueous and Cellular Measurements
The objective of this Ph.D. study was to develop new and improved miniaturized particle-based optochemical sensors for the analysis of biological fluid and cellular components. This is highly important because current sensing systems can be biologically toxic and incompatible, invasive, and have …
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Platelet Dense Granules Mature Within Late Stages Of Megakaryocyte Differentiation By Cargo Delivery
… such as ADP and serotonin, and larger polyphosphates that are secreted upon platelet stimulation to enhance platelet activation, adhesion, and stabilization at sites of vascular damage. However, the precise timing of DG formation and maturation has not been definitively characterized, and …
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AUTOMATED FLOW INJECTION INSTRUMENTATION FOR MONITORING NITROGEN SPECIES IN NATURAL WATERS
… optical resolution, wavelength repeatability, photometric linearity and instrumental noise and drift. The incorporation of the Ocean Optics PSD - 1000 miniature spectrometer into a gas diffusion Flow Injection (Fl) manifold for the determination of ammonia in natural waters is detailed in …
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The utility of sedimentary diatoms as a measure of historical lake ph
As a result of increased acid precipitation, the pH of a large number of Canadian Shield lakes has been falling. Prior to this study there was no documentation available to explain the history of lake acidification for the Algoma area lakes. In order to obtain this information the diatom inferred …
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Analysis of drug polymorphism by diffuse reflectance visible spectroscopy- a novel approach
The existence of polymorphic forms of drug substances has implications for therapeutic performance, handling and storage. This study investigates the development of a novel approach to surface analysis of drug polymorphs, with the aim of extending the capabilities of this approach to perform real …
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Novel Electrochemical Methods for Acidity Monitoring: Theory, Design and Application
… the design and development of novel voltammetric pH sensors for buffered, low-buffered and unbuffered media. pH sensors in stagnant and hydrodynamic environments were designed and developed for performing measurements using square wave voltammetry. Chapter 1 introduces the motivation of this …
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Self-amplifying degradable polyurethanes and their upcycling application
… the copolymerization methodology to synthesize photo-triggered self-amplifying degradable polyurethane materials. The incorporation of a small amount of an ortho-nitrobenzyl carbamate unit as a photo-sensitive moiety in the polymer backbone enables basic amine species generation after UV …
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Microfluidic Transport Studies on Lipid Vesicles
… research in many fields of science, such as biophysics, pharmacology and synthetic biology. In this thesis, we develop new microfluidic methods that allow us to study the laws that govern the transport processes through lipid bilayers. We use the novel microfluidic Octanol-Assisted Liposome …
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Hierarchical Supramolecular Assemblies Based on Host-Guest Chemistry between Cucurbit[n]uril and Azobenzene Derivatives
… yet dynamic ternary complexes.Owing to the photo-induced \textit{trans} to \textit{cis} isomerisation property, azobenzene (Azo) derivatives have been widely employed in several host-guest systems, leading to various light-responsive materials. This thesis focuses on CB[8]-based ternary …
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Untersuchungen zur hygienischen und mikrobiologischen Qualität von marinierten Fleischzubereitungen zur Festlegung von Richtwerten bei der Kontrolle des Mindesthaltbarkeitsdatums (MHD)
… sensory examination, microbiological survey, and pH value. The sensory examination included “general characteristics”, “external qualities”, “consistency”, “appearance”, “odor”, “taste” and “haptic consistency”. Taste and haptic consistency were only determined for the marinades and seasoning …