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 30 for “"exhaled breath"”.
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Exhaled breath analysis using laser absorption spectroscopy
… developing field, with many applications in breath diagnostics and therapeutic monitoring. For this thesis, laser spectroscopic techniques were employed to measure exhaled nitric oxide (NO), carbonyl sulfide (OCS) and carbon dioxide (CO2). A pulsed quantum cascade laser operating at 4.86 …
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Precision measurement of carbon isotope ratio in exhaled breath for the detection of helicobacter pylori
… normal">The utility of breath trace compounds as bio-markers for various physiological conditions has long been exploited for the diagnosis of various diseases. Urea breath tests have been adopted as the gold standard for the detection of Helicobacter pylori which is a …
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Detection of hydrogen peroxide and ethanol in exhaled breath using biosensors: Considerations in standardizing breath collection
Breath monitoring is a non-invasive, safe, and repeatable approach to determining the health status of humans and other mammals. Breath samples could be detected in two ways directly sensing exhaled breath (EB) or chilling the EB to obtaining the exhaled breath condensate (EBC). Each has its …
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Development of a sampling system for the collection of exhaled breath condensates and its subsequent analysis using 2-dimensional gas chromatography
Exhaled human breath contains thousands of compounds that provide information about the physiological state of the human body, yet it is not used as extensively as blood or urine samples for medical diagnostics. Some of the major reasons for this include the lack of a standard method of sample …
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Assessment of a methodology for determination of H[2]O[2] concentration and pH in exhaled breath condensate in horses with and without lower airway inflammation
… hydrogen peroxide (H2O2) concentration and pH in exhaled breath condensate (EBC) is useful for detection and monitoring of diseases of the lower respiratory tract in humans, including asthma and chronic obstructive pulmonary disease. In contrast, limited information on the use of these parameters …
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Auswirkung von körperlicher Belastung auf die Konzentration von 3-Nitrotyrosin im Atemkondensat
… functional pulmonary damages. The analysis of breath condensate is a new non-invasive method to examine processes in the air passages. The breath condensate contains non-gaseous compounds of exhaled breath, which reflects the composition of the bronchoalveolar extracellular lining fluid. The …
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Capnographic analysis for disease classification
… information from carbon dioxide in the exhaled breath are qualitative, through visual inspection, and therefore imprecise. In this thesis, we quantify the CO₂ waveform, or capnogram, in order to discriminate among various lung disorders. Quantitative analyses of the capnogram are …
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Biomarker in Atemkondensat und Serum bei asbestbedingten Lungenfibrosen
… was very successful. Measurements were taken in exhaled breath condensate and serum. In exhaled breath condensate there is a high dilution effect which has to be compensated by relation to the standardisation parameters. The sample volume of 1 ml was still sufficient. In serum proline and …
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Terahertz wave-molecule interactions via CMOS chips : from comb gas sensor with absolute specificity to ultra-stable, miniaturized clock
… analysis of complicated gas mixtures (e.g. human exhaled breath and industrial gas leakage). To utilize this important property, a CMOS dual-frequency-comb spectrometer is proposed and implemented. Broadband (220~320GHz), fast scanning (20x faster than conventional single-tone sensors) and highly …
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Flüchtige organische Verbindungen in der Ausatemluft von Kindern und Jugendlichen mit Asthma bronchiale
Inflammatory mediators in the exhaled breath are receiving growing medical interest as non-invasive disease markers. Voltaile organic compounds have been investigate in this context, but clinical information and methodological standards are limited. We measured the levels of ethane, propane, …
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NON INVASIVE CANCER DETECTION: FROM BENCH TO BEDSIDE
… cancer markers were identified using end-tidal exhaled breath. A novel plant inspired, robust, low-cost, eco-friendly and easy to use chemiresistive volatile sensor array was developed. In future, this novel sensor array could be used as diagnostic tool for detecting cancer.
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Fluorinated Graphene Oxide Based Chemiresistive Gas Sensor Targeting NH3 and Other Analytes Under Atmospheric Conditions
… continuous health monitoring applications in exhaled breath testing.
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Analysis of Endogenous Particles in Exhaled Air
Exhaled air contains non-volatile particulate material from the respiratory tract. The precise location in which exhaled particles are formed is unknown, and details on their chemical content are scarce. The aim of this work was to chemically characterize and to study the mechanisms of formation of …
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Development and validation of a diagnostic tool for occupational asthma based on serial lung function measurements
… than FEV1, although FEV1 was more reproducible. Exhaled breath nitric oxide (FENO) showed similar ABC scores between those with normal and raised FENO. FENO was significantly correlated to methacholine reactivity. In shift workers, mean ABC scores were increased on morning shifts compared to …
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Improving smoking cessation for vulnerable populations in low-resourced settings
… at 6 months was biochemically verified using exhaled breath carbon monoxide (CO) and urine cotinine test. Modified Poisson regression models examined the association between NMR (high vs. normal) and 6-month abstinence. Effect modification (on the additive and multiplicative scale) examined …
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Biomarkers of oxidative stress and inflammation in biological samples collected from recurrent airway obstruction (RAO)-affected horses and their controls
… inflammatory and oxidative stress biomarkers in exhaled breath condensate (EBC), bronchoalveolar lavage fluid (BALF), red blood cells, white blood cells, and plasma; and cytokine expression in airway inflammatory cells and mucosal biopsies of RAO-affected horses and their controls. Sixteen horses …
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Applications of Proton Transfer Reaction and Selected Ion Flow Tube Mass Spectrometry in Health Monitoring
… VOCs may be found in the human body, in exhaled breath, faecal matter, urine, and skin. Analysis of the volatile profile produced in the human body can provide an indicator of metabolic status, allowing the screening and monitoring of different diseases and conditions, non-invasively and …
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Characterisation of exacerbations in non-CF Bronchiectasis to establish endpoints in measuring treatment efficacy
… by a visual analogue score are useful endpoints. Breathlessness is a reliable endpoint when measured using either a visual analogue score or modified Borg’s breathlessness score. Health related quality of life measured using the Euroqol questionnaire is a sensitive marker of change during an …
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Health Assessment of Artisanal Metal Work: Injury Patterns, Aerosol Exposures, and Biomonitoring
… biological matrices: blood, urine, saliva, and exhaled breath condensate (EBC). Blood samples yielded the most consistent quantification, particularly for manganese and chromium, and correlated with personal air concentrations. Saliva and EBC also showed promise as non-invasive alternatives for …
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