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 58 for “"Selective detection"”.
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Microfluidic electrochemical sensors for the selective detection of toxic compounds
… and optimization of several different analyte selective, liquid based detection chemistries, as well as the micro-fluidic device platforms which enable these sensors to be operated in a practical, effective manner. The majority of the work in this thesis involves an aqueous based chemistry …
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A Gas Sensor for the Selective Detection of Volatile Organic Compounds
… (ppb) and lower – which makes their detection a significant challenge. Standard measurement techniques, such as Gas Chromatography (GC), are typically sensitive and selective, but are limited by their large size, high cost and complexity to operate. Such factors restrict deployment …
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Frequency Selective Detection of Infrared Radiation in Uncooled Optical Nano-Antenna Array
Mid-infrared (mid-IR) detection and imaging over atmospheric transparent 3-5 μm and 8-12 μm bands are increasingly becoming important for various space, defense and civilian applications. Various kinds of microbolometers offer uncooled detection of IR radiation. However, broadband absorption of …
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The Formation of an Electrochemical Sensor for the Selective Detection of Dopamine
… in this study and it was also highly selective towards DA in the presence of a wide variety of major interfering compounds. The sulfonated β-cyclodextrins were immobilised in a polypyrrole film via a potentiostatic mode of growth from an aqueous solution of pyrrole and sulfonated …
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MEMS-based resonant sensor arrays : selective detection of volatile and toxic chemicals
… are many options available for gaseous chemical detection and identification, not all are well-suited toward the creation of a portable device. Boston MicroSystems, Inc. (BMS) has developed a resonant chemical sensor that is predicted to meet the performance needs of the current market in terms …
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Applications of LC-MS metabolomic profiling in inflammatory bowel disease and the development of derivatisation methods to enhance selective detection of certain compound classes
… dilution. The method was very sensitive but detection limits were set by the background contamination by the SCFAs rather than by absolute sensitivity.;The method was applied to the urine samples and differences in acetate and butyrate were found between the affected and control samples. The …
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Detection of Biologically Important Molecules
… of anion sensors has been of great interest. The selective detection of a specific anion is particularly challenging. In the first chapter, I describe the synthesis of a TBS-protected fluorescein dye (1.1) and its use for the selective detection of fluoride. Solutions of 1.1 either in DCM or in …
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Singlet-Delta Molecular Oxygen as a Tool for Selective Chemiluminescent Detection in Chromatography
… has demonstrated its potential as a tool for selective detection in high-performance liquid chromatography (HPLC). Excited molecular oxygen, formed for this work in the chemical reaction between hydrogen peroxide and hypochlorite, brings about sample luminescence by energy transfer to an …
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Internal and External Vibrations of Weakly Bound Molecular Complexes: Infrared Spectroscopy and Vibrational Analysis
… continuous supersonic expansion source and mass selective detection which employs electron impact ionization and quadrupole mass filtering. A Nd:YAG-pumped optical parametric oscillator (OPO) provided tunable infrared radiation in the 2.5 to 3.5 $\mu$ region.
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An investigation of volatile organic compounds in landfill gas
… of VOCs using gas chromatography with mass selective detection (GC/MS).
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Synthesis towards synthetic adenosine receptor
… the physiological state of the body. However its selective detection by synthetic receptors is not possible till date. Efforts have been made here to design molecular tweezer for adenosine. Multistep synthesis was done to synthesize two clamps, namely the [pi]-[pi] stacking clamp and the hydrogen …
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ANALYSIS OF PHARMACEUTICALS AND BIOMOLECULES USING HPLC COUPLED TO ICP-MS AND ESI-MS
… MS) in positive ion mode. Improvements in detection limits post-derivatisation were achieved, and this method was successfully used for the determination of sorbic acid in a sample of Panadol™. HPLC coupled with sector field inductively coupled plasma mass spectrometry (SF-ICP-MS) has been …
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Detection of trace concentrations of small and big molecules through vibrational spectroscopy
… within "hotspots" (<10 nm), which limits detection to molecules that can access these regions. We investigated two differently fabricated SERS-active substrates: pulsed laser deposited gold nanoparticles and electrochemically deposited silver nanoparticles, optimized for 633 nm and 532 nm …
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Fundamental Studies And Applications Of Strong Field Ionization
… in a DC sliced imaging apparatus. For the isomer selective detection experiment, the machine was used simply as a time-of-flight mass spectrometer. The mass spectrum of each isomer was used as "basis function" to characterize the complex mixtures quantitatively.</p>
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Development Towards an Ethylene Sensing Artificial Metalloenzyme
… for climacteric plants, and consequently its detection and quantification is of considerable interest to the horticulture industry. Its detection however is a non-trivial pursuit, traditionally requiring expensive and inaccessible instrumentation that fail to provide in vivo information about …
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Aspects of the microwave induced plasma as an element selective detector for supercritical fluid chromatography and supercritical fluid extraction
… vessel and an Ar MIP for the purpose of element selective detection. The response of the plasma to the introduction of sample via SFE at a variety of extraction temperatures, pressures, and sample concentrations is presented.
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Optimizing the Toehold-Mediated Strand Displacement Reaction on the Nanoparticle Surface by Altering the Surface DNA Density for the Design of a microRNA NanoOptical Sensor
… manipulate the system for the rapid and selective detection of a nucleic acid biomarker microRNA-210, enabling diverse biological applicability
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A Novel NGS Assay to Detect Any KMT2A Fusion Transcript at Low Levels
<p>Measurable residual disease (MRD) detection is associated with cancer relapse. Leukemias with rearrangement of the lysine methyltransferase 2 A gene (<em>KMT2Ar</em>) have an adverse prognosis with more than 80 possible fusion partner genes (FPG) identified. With the advent of effective targeted …
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A Microelectromechanical-Cantilever Hydrogen Sensor with Palladium-Driven Bending and Piezoresistive Readout
… and explosive nature of H₂, highly sensitive and selective detection systems with fast response are needed to enable leakage monitoring to ensure safe deployment and use. To address this need, we propose a microelectromechanical (MEMS) platform for H₂ sensing with the aim of achieving sub-1-ppm …
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Dendrimer Modified Silica Nanoparticles as Fluorescent Chemosensors for the Detection of Copper and Cyanide Ions
… were synthesized for the sensitive and selective detection of Cu<sup>2+ </sup>ions in aqueous solution and subsequent CN<sup>-</sup> ion detection. Silica nanoparticles (SNP) were modified with branching polyamidoamine (PAMAM) dendrimers, which function as selective turn-off Cu<sup>2+ …
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