Results 11 to 20 of about 757 (137)

Influence of Calcium Perchlorate on the Search for Organics on Mars with Tetramethylammonium Hydroxide Thermochemolysis [PDF]

Astrobiology, 2021
The Mars Organic Molecule Analyzer (MOMA) and Sample Analysis at Mars (SAM) instruments onboard the Exomars 2022 and Mars Science Laboratory rovers, respectively, are capable of organic matter detection and differentiating potentially biogenic from abiotic organics in martian samples.
He, Yuanyuan, Buch, Arnaud, Szopa, Cyril, Williams, Amy J., Millan, Maeva, Malespin, Charles A., Glavin, Daniel P., Freissinet, Caroline, Eigenbrode, Jennifer L., Teinturier, Samuel, Coscia, David, Bonnet, Jean-Yves, Stern, Jennifer C., Stalport, Fabien, Guzman, Melissa, Chaouche-Mechidal, Naïla, Lu, Pin, Navarro-González, Rafael, Butin, Vincent, El Bekri, Jamila, Cottin, Hervé, Johnson, Sarah, Cabane, Michel, Mahaffy, Paul R.   +23 more
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Thermochemolysis of organic matter preserved in stalagmites: A preliminary study [PDF]

Organic Geochemistry, 2009
The analysis of organic matter (OM) preserved in stalagmites is a growing field, but there have been few studies of biomarker compounds such as lignin phenols that are widely used in other palaeoenvironmental contexts. Here we present a preliminary qualitative study of the organic matter in six stalagmite samples from contrasting environments, using ...
Blyth, Alison, Watson, J.
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Ammonium Y zeolite applied as a thermochemolysis reagent for identification of polyethers and polyesters

Journal of Chromatography A, 2013
A potential thermochemolysis reagent has been tested for the pyrolysis gas chromatographic identification of polyether, polyester and polyether- or polyester-based thermoplastic polyurethane. The main advantage of ammonium Y zeolite over liquid reagents is that it does not react prior to pyrolysis, and its reactions have no incomplete products.
Blazsó, Marianne, Bozi, János
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The application of TMAH thermochemolysis on the detection of nucleotides: applications for the SAM and MOMA space experiments

Journal of Analytical and Applied Pyrolysis, 2023
The Sample Analysis at Mars (SAM) instrument onboard the Curiosity rover and Mars Organic Molecule Analyzer (MOMA) instrument onboard the ExoMars rover are two of the most important instruments used for the in-situ search for biosignatures of life on Mars.
He, Yuanyuan, Buch, Arnaud, Szopa, Cyril, Williams, Amy, Freissinet, Caroline, Guzman, Melissa, Boulesteix, David, Millan, Maeva, Coscia, David, Bonnet, Jean-Yves, Cabane, Michel   +10 more
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Thermochemolysis of the Murchison meteorite: identification of oxygen bound and occluded units in the organic macromolecule [PDF]

International Journal of Astrobiology, 2010
AbstractAn organic macromolecular residue, prepared from the Murchison meteorite by treatment with hydrofluoric and hydrochloric acids, was subjected to online thermochemolysis with tetramethylammonium hydroxide (TMAH). The most abundant compound released by thermochemolysis was benzoic acid. Other abundant compounds include methyl and dimethyl benzoic
Watson, Jonathan S., Sephton, Mark A., Gilmour, Iain   +2 more
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Biomarkers in the Products of Lignite Humic Substances Thermochemolysis [PDF]

Почвознание, агрохимия и екология, 2011
Biomarker composition of bitumen-free humic acids from Thracian lignite was studied. TMAH thermochemolysis and methods of organic geochemistry were applied. A broad range of compounds were isolated and mass spectrometrically characterized.
M. Stefanova, S. Marinov, L. Grasset, A. Ambles   +3 more
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Assessing Lignin Decomposition and Soil Organic Carbon Contents Across a Tropical Savannah-Rainforest Boundary in Guyana

Frontiers in Forests and Global Change, 2021
The soils beneath the rainforest of Guyana have the potential to hold, and release, large stores of carbon under land use and climate change. Little is known about soil carbon stocks or molecular dynamics in this region.
Jasmine E. Black, Thomas Wagner, Geoffrey D. Abbott   +2 more
doaj   +1 more source

The Search for Fatty Acids on Mars: Results from the First In Situ Thermochemolysis Experiment at Gale Crater, Mars

, 2020
International audienceThe SAM instrument on the Curiosity rover can perform wet chemistry experiments in conjunction with pyrolysis gas chromatography mass spectrometry (py-GC-MS) analysis of surface samples.
Millan, Maëva, Fox, V. K., Knudson, C. A., Navarro-Gonzalez, R., Lewis, J. M. T., Malespin, C., Johnson, S., Mcadam, A., Williams, A. J., Brinckerhoff, W. B., Mahaffy, P. R., Szopa, Cyril, Williams, R. H., Teinturier, S., Freissinet, Caroline, Eigenbrode, J. L., Buch, A., Summons, R. E., Bryk, A. B., Glavin, D. P.   +19 more
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Determination of polyacrylamide based flocculants in sewage sludge by off-line thermochemolysis-GC–MS analysis

Discover Water, 2023
This study aimed to develop an offline thermochemolysis method for the determination of cationic polyacrylamide (cPAA) flocculants in environmental samples, using trimethylanilline hydroxide as a thermochemolytic agent. This method induces degradation of
Ivana Jovancicevic, Jan Schwarzbauer
doaj   +1 more source

The analysis of European lacquer: optimization of thermochemolysis temperature of natural resins [PDF]

Applied Physics A, 2016
In order to optimize chromatographic analysis of European lacquer, thermochemolysis temperature was evaluated for the analysis of natural resins. Five main ingredients of lacquer were studied: sandarac, mastic, colophony, Manila copal and Congo copal. For each, five temperature programs were tested: four fixed temperatures (350, 480, 550, 650 °C) and ...
Louise Decq, Frederic Lynen, Michael Schilling, Wim Fremout, Vincent Cattersel, Delphine Steyaert, Charles Indekeu, Emile Van Binnebeke, Steven Saverwyns   +8 more
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