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 “"biosignature"”.
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Detectability of biosignature gases in the atmospheres of terrestrial exoplanets
Biosignature gases in the atmosphere of an exoplanet provide a means by which we can deduce the possible existence of life on that planet. As the list of possible biosignature gases is ever growing, the need to determine which molecules provide the best opportunities for detection grows as well. …
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Atmospheric photochemistry, surface features, and potential biosignature gases of terrestrial exoplanets
The endeavor to characterize terrestrial exoplanets warrants the study of chemistry in their atmospheres. Here I present a comprehensive one-dimensional photochemistry-thermochemistry model developed from the ground up for terrestrial exoplanet atmospheres. With modern numerical algorithms, the …
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Planetary Science Meets Chemistry: Studying Potential Biosignature Gases in Terrestrial Exoplanet Atmospheres
… more exoplanets are discovered, searching for biosignature gases is becoming one of the crucial ways to find extraterrestrial life. Biosignature gases are gases produced by living organisms that can accumulate to detectable levels in the atmosphere. Once detected, it can be attributed to signs …
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Biosignature storage in sulfate minerals- synthetic and natural investigations of the jarosite group minerals
… the possibility that jarosite can store biosignatures. Natural samples were analyzed by x-ray diffraction, elemental carbon analysis and laser-desorption Fourier transform mass spectrometry (LD-FTMS) and were found to contain the amino acid glycine. Synthetic experiments were conducted in …
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Biosignature storage in sulfate minerals- synthetic and natural investigations of the jarosite group minerals
… the possibility that jarosite can store biosignatures. Natural samples were analyzed by x-ray diffraction, elemental carbon analysis and laser-desorption Fourier transform mass spectrometry (LD-FTMS) and were found to contain the amino acid glycine. Synthetic experiments were conducted in …
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Profiling the Serotonin2 Receptor System Functional Capacity: Towards Identification of a Cocaine Use Disorder Biosignature
… of treatments. Characterization of a CUD biosignature through the use of defining biological markers will greatly improve our ability to predict patient response, disease risk, accurate CUD diagnosis and potentially even identify novel targets for medications development, all the while …
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Investigating Steady State Visually Evoked Potentials as a Novel Biosignature for Anxiety-Related Attention Bias
… attention derived from EEG, holds promise as a biosignature for AB. Research documents heightened SSVEP power to emotionally salient stimuli such as threat faces among those with social anxiety; however, less is known about the association between SSVEP to threat and neutral stimuli among those …
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Methanogens from Siberian permafrost as models for life on Mars : response to simulated martian conditions and biosignature characterization
… Siberian permafrost, and to characterize their biosignatures by means of Raman spectroscopy, a powerful technology for microbial identification that will be used in the ExoMars mission. For this purpose, methanogens from Siberian permafrost and non-permafrost habitats were subjected to simulated …
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Isotopes as a Tool for Exploring Exoplanet Atmospheres
… I also extend this to the detectability of novel biosignature gases by way of carbon isotope ratios. I evaluated the detectability of ¹³CO₂ in the atmospheres of temperate terrestrial and sub-Neptune sized planets and assess its suitability as a biosignature gas. While the search for signs of life …
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Mitochondrial disorders in the South African context : a clinical and biochemical approach
… further in the development of an explorative biosignature. Finally, a biosignature comprising of six organic acids, six amino acids and one other marker was constructed. It included succinic acid, lactic acid, 3-OH-isobutyric acid, 3-OH-valeric acid, 3-OH-3-Me-glutaric acid, 2-OH-glutaric …
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Modelling biogeochemical controls on planetary habitability
… with implications for long-term habitability and biosignature detection. The duration of these habitable conditions are controlled by multiple factors, including the orbital distance of the planet, its mass, the evolution of the host star, and the operation of any (bio)geochemical cycles that may …
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Metabolomics-based diagnosis and prognosis of dengue virus infections and NS1 antigen detection for diagnosis and surveillance in humans and mosquitoes
… was used in these studies to determine a biosignature of small molecular biomarkers (SMBs) that can potentially differentiate patients with the most severe forms of disease from DF and non-DEN patients. SMBs that could potentially be diagnostic of DENV infections and prognostic of disease …
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Analysis of urinary lipid biomarker candidates from tuberculosis patients by multiple reaction monitoring
… as part of a panel which represents a unique biosignature according to the disease state of the patient.
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Internal Structures in the Sub-Neptune Regime
… of habitability and the potential for biosignature detections, due to their being more conducive to atmospheric observations compared to Earth-like planets. I calculate the range of ocean depths possible for hycean worlds, dependent on the surface gravity and surface temperature. I then …
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Characterization and quantification of urinary metabolic biomarkers for early response to anti-tuberculosis treatment
… of these compounds towards a clinically useful biosignature. A major impediment to metabolomics-based biomarker discovery is metabolite identification, as approximately 50% of detectable products do not match structures in existing databases. In concordance with this, several of the potential …
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The Search For Volatile Biogenic Emissions In Geothermal Areas
… life outside of the earth’s ecosystem. Detecting biosignatures in outer space is one way this search is conducted. To understand the biosignatures to look for and study in space, it is useful to gain a better understanding of life in diverse environments on earth. This research tested the …
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The Search For Volatile Biogenic Emissions In Geothermal Areas
… life outside of the earth’s ecosystem. Detecting biosignatures in outer space is one way this search is conducted. To understand the biosignatures to look for and study in space, it is useful to gain a better understanding of life in diverse environments on earth. This research tested the …
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CHARACTERIZATION OF HALOPHILIC MICROORGANISMS AND SULFATE SALTS FROM THE HYPERSALINE LAKES OF BRITISH COLUMBIA, CANADA; AN ASTROBIOLOGICAL PERSPECTIVE
… that reflectance IR is capable of detecting biosignatures within a sulfate matrix, the most sensitive of which are the 1550 ± 20 cm'1, C-N, N-H, -COOH absorptions and the 1040 ±10 cm'1C-OH, C-N, PO43' bond features. Due to its sensitivity and non-destructive nature reflectance IR can be …