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 19 of 19 for “"TOFMS"”.
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Time-of-Flight Mass Spectrometry to Characterize Inorganic Coordination Complexes and Cyanobacteria
… time-of flight mass spectrometry (MALDI-TOFMS) is used to study several inorganic coordination complexes and a variety of compounds from cyanobacteria. Also presented is a discussion of TOFMS instrumentation and the improvements in resolution and instrument automation that have lead to …
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Analysis of Clinically Important Compounds Using Electrophoretic Separation Techniques Coupled to Time-of-Flight Mass Spectrometry
… coupled to time-of-flight mass spectrometric (TOFMS) detection for the analysis of three families of biological compounds that act as mediators and/or indicators of disease, namely, catecholamines (dopamine, epinephrine, norepinephrine) and their O-methoxylated metabolites (3-methoxytyramine, …
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Mass selective investigations of ultrafast dynamical processes and spectroscopy
… (REMPI) with Time-of-Flight mass spectrometric (TOFMS) detection.
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Analysis of the volatile organic compounds produced by the decomposition of pig carcasses and human remains
… time-of-flight mass spectrometry (TD-GCxGC-TOFMS). The additional peak capacity and spectral deconvolution of the GCxGC-TOFMS system generated a characteristic profile of decomposition VOCs across the various stages of soft tissue decomposition. The profile was comprised of numerous chemical …
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Improving Detection and Identification Methods for Volatile Organic Explosives
… coupled to a time of flight mass spectrometer (TOFMS) were investigated. The conventional GC-MS method proved to be inefficient for headspace profiling, whereas the GC×GC-TOFMS was successful in separating and detecting the key VOCs from explosive samples. 2,3-dimethyl-2,3-dinitrobutane (DMDNB), …
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The Development and Evaluation of Non-invasive Methods to Characterise the Disease States of Patients Utilising Selective Discrimination, Gas Chromatography-Mass Spectrometry and Chemometrics
… solid-phase microextraction (HS-SPME-GC-ToFMS). A robust and sensitive method was developed by optimisation of all sample analysis parameters and was applied to clinical samples from bladder and prostate cancer patients and those with hepatic disorders. This evidence was obtained by …
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On the simulation and modeling for the reaction mechanism and solid state detonation phenomena in non-conventional explosives
… thesis is the Time of Flight Mass Spectroscopy (TOFMS). It monitors the Deflagration to Detonation Transition phenomena of small-scale explosive samples in vacuum subjected to short duration shock stimuli. To support the experiment in vacuum chamber, the numerical simulation of particle expanding …
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Measurement of lipid peroxidation in biology models using gas-chromatography-aass spectrometry
… time-of-flight mass spectral capabilities (GC-TOFMS) and were found to include the lipid peroxidation product hexanal. The pro-oxidant cumene hydroperoxide elevated the levels of these lipid peroxidation products, whereas the anti-oxidant butylated hydroxy toluene (BHT) impaired their …
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Application of Polychlorinated Biphenyl Signatures for Environmental Fingerprinting
… with time of flight mass spectrometry (GCxGC-ToFMS) method was designed and optimised to provide a congener specific method capable of identifying 200 out of the 209 PCBs, with detection limits in human serum in the range of 1 to 10 ng g-1 lipid. The extraction and detection methods were used …
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Which way did it go? Revisiting the time-resolved study of bromine atom and iodine molecule
… (REMPI)-Time of Flight Mass Spectroscopy (TOFMS), allows unambiguous identification of products. The interaction is initiated in a restricted region of phase space defined by the geometry of the precursor dimer, H(D)Br$\rm\sp {*}I\sb 2$. The photodissociation of H(D)Br provides both Br and …
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The effect of different sample preparatory protocols on the induction of the aryl hydrocarbon receptor (AhR) in the H4IIE–luc reporter gene bio–assay
… to time of flight mass spectrometry (GCxGC-TOFMS). Instrumental results indicated a high level of PAHs in the extracts, which could lead to super induction of the aryl hydrocarbon receptor (AhR) and therefore, to a positive bias in the results. Instrumental screening proved that all selected …
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QuEChERS (Quick, Easy, Cheap, Effective, Rugged, and Safe) Extraction – Gas Chromatography for the Analysis of Drugs
… of hormones from water using GC-MS/MS and GCxGC-TOFMS including a comparison of QuEChERS to solid phase microextraction (SPME) using GC-MS/MS, and finally the extraction of drugs of abuse from synthetic urine.</p>
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Study of Polyaromatic Hydrocarbons Emitted in the Fly Ash from Coal Combustion in a Fluidized Bed Combuster
… of the PAHs without any use of a solvent. The GC/TOFMS was used to analyze the samples that were extracted by the thermal extraction method. In this study, the effects of combustion temperature, combustion bed height, sampling height, excess air ratio, and fluidizing velocity were examined to …
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Determination of a robust metabolic barcoding model for chemotaxonomy in Aizoaceae species : expanding morphological and genetic understanding
… Aizoaceae species were generated using LC/TOFMS, following which Principal Components Analysis (PCA) was used to identify the LC-MS ions which distinguished the species from each other, or in statistical terms, were informative. Once isolated, this subset of informative data was established …
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The application of novel mass spectrometric techniques for the analysis of volatile organic compounds in different environments
… Reaction-Time of Flight-Mass Spectrometer (PTR-ToFMS) enabling a direct comparison to be made between these instruments during field scale measurements.
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Estudio de la distribución espacial y temporal de las especies excitadas en plasmas de descargas luminiscentes
… a un espectrómetro de masas de tiempo de vuelo (TOFMS) en nuestro laboratorio con fines analíticos. Con el fin de llevar a cabo los estudios con resolución espacial de la emisión lateral del plasma, se han utilizado sistemas ópticos basados en detectores iCCD. La influencia de los parámetros de …
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Gas Phase Studies of Molecular Clusters Containing Metal Cations, and the Ion Mobility of Styrene Oligomers
This study is divided into three parts. Part I deals with the mechanism of the self-initiated polymerization (or thermal polymerization) of styrene in the gas phase. In this work, we present the first direct evidence for the thermally self-initiated polymerization of styrene in the gas phase. Our …