Summary
Injection of14C-labeled nutrient onto Mars soil produced an evolution of14C gas in the Viking Labeled Release (LR) experiment. However, a second injection of nutrient seven days later was followed by an abrupt diminution of the amount of radioactive gas in the test cell. Simulation experiments performed in the LR Test Standards Module (TSM) have yielded a plausible explanation for this diminution. Radioactive carbon gases were injected into the TSM test cell in the presence and absence of two Mars analog soils. After equilibration, water was injected and its effect observed. The results indicate that the flight data following second nutrient injection can be explained on a physico-chemical basis involving a carbon dioxide/water/soil equilibrium in the test cell. The results also suggest that the gaseous end product of the Labeled Release reaction on Mars is more likely carbon dioxide than carbon monoxide.
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References
Hargraves, R.B., Collinson, D.W., Arvidson, R.E., Spitzer, C.R. (1977). J. Geophysical Research.82, 4547–4558
Levin, G.V., Straat, P.A. (1976a). Origins of Life.7, 293–311
Levin, G.V., Straat, P.A. (1976b). Science.194, 1322–1329
Levin, G.V., Straat, P.A. (1977a). Biosystems.9, 165–174.
Levin, G.V., Straat, P.A. (1977b). J. Geophysical Research.82, 4663–4667
Levin, G.V., Straat, P.A. (1979). J. Mol. Evol.14, 167–183
Oyama, V.I., Berdahl. B.J., Woeller, F., Lehwalt, M. (1978). COSPAR-Life Sciences in Space Research.16, 1–6
Plumb, R. (1978). Presentation at the XXIth Plenary; Meeting of COSPAR. Innsbruck. May 25
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Levin, G.V., Straat, P.A. Laboratory simulations of the Viking Labeled Release experiment: Kinetics following second nutrient injection and the nature of the gaseous end product. J Mol Evol 14, 185–197 (1979). https://doi.org/10.1007/BF01732377
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DOI: https://doi.org/10.1007/BF01732377