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DOI | 10.1016/j.asr.2011.12.012 |
Decomposition of sodium formate and L- and D-alanine in the Pampas de La Joya soils: Implications as a new geochemical analogue to Martian regolith | |
Valdivia-Silva, Julio E.1,2; Navarro-Gonzalez, Rafael1; de la Rosa, Jose1; McKay, Christopher P.2![]() | |
通讯作者 | Valdivia-Silva, Julio E. |
来源期刊 | ADVANCES IN SPACE RESEARCH
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ISSN | 0273-1177 |
EISSN | 1879-1948 |
出版年 | 2012 |
卷号 | 49期号:5页码:821-833 |
英文摘要 | The organic compounds on the Martian surface are still undetectable by the previous Viking mission that has been sent to Mars even though they are expected to be there by exogenous and/or endogenous synthesis. The high abiotic reactivity has been the most acceptable explanation for the apparently absence of organic matter in the regolith. Earth soils that have geochemical properties similar to those expected on the surface of Mars could help to decipher this question on the surface and shallow subsurface of the Red Planet. This work aims to demonstrate that the place known as the Pampas de La Soya desert in southern Peru, contains soils that have nonbiological chemical decomposition mechanisms of organic compounds under conditions of the Viking Labeled Release Experiment (LRx). We compare the organic decomposition kinetics of these hyper-arid soils with those seen in samples from arid and semiarid regions of the Atacama Desert, and data obtained by Viking LRx in the Martian regolith. (13)Carbon-labeled organic compounds (sodium formate, D-, and L-alanine) were added in aqueous solution to different soil samples in order to analyze the evolved carbon dioxide ((CO2)-C-13) generated during their degradation. As expected, there were significant differences in the evolved gas behavior between soil samples under similar experimental conditions. When sodium formate was added to hyper-arid samples, there was a peak of (CO2)-C-13 gas released demonstrating high oxidation activity in the soil. Heat treatment of soil samples did not completely eliminate the CO2 production. An increase in the decomposition rates 7 days after the first addition of organics showed a response consistent with biological activity. The addition of D- and L-alanine demonstrated that the production of (CO2)-C-13 due to biological decomposition began 5-8 days after incubation. Our results suggest that these soils from Pampas de La Joya present at least two types of oxidants, a thermostable one which is highly oxidative and survives heat-treatment, and other thermolabile oxidant which has light or moderate oxidizing activity and does not survives to the heat-treatment. So far the nature of oxidant(s) present in these soils is still unknown. (C) 2011 COSPAR. Published by Elsevier Ltd. All rights reserved. |
英文关键词 | Mars-like soils Pampas de La Joya Atacama Desert Labeled Release Experiment Abiotic oxidation |
类型 | Article |
语种 | 英语 |
国家 | Mexico ; USA |
收录类别 | SCI-E |
WOS记录号 | WOS:000301610600001 |
WOS关键词 | VIKING BIOLOGY EXPERIMENTS ; MARS-LIKE SOILS ; LABELED RELEASE ; ATACAMA DESERT ; LIFE ; REACTIVITY ; ARIDITY ; MISSION ; SEARCH ; ORIGIN |
WOS类目 | Astronomy & Astrophysics ; Geosciences, Multidisciplinary ; Meteorology & Atmospheric Sciences |
WOS研究方向 | Astronomy & Astrophysics ; Geology ; Meteorology & Atmospheric Sciences |
来源机构 | Universidad Nacional Autónoma de México |
资源类型 | 期刊论文 |
条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/170980 |
作者单位 | 1.Univ Nacl Autonoma Mexico, Inst Ciencias Nucl, Lab Quim Plasmas & Estudios Planetarios, Mexico City 04510, DF, Mexico; 2.NASA, Ames Res Ctr, Space Sci & Astrobiol Div, Moffett Field, CA 94035 USA |
推荐引用方式 GB/T 7714 | Valdivia-Silva, Julio E.,Navarro-Gonzalez, Rafael,de la Rosa, Jose,et al. Decomposition of sodium formate and L- and D-alanine in the Pampas de La Joya soils: Implications as a new geochemical analogue to Martian regolith[J]. Universidad Nacional Autónoma de México,2012,49(5):821-833. |
APA | Valdivia-Silva, Julio E.,Navarro-Gonzalez, Rafael,de la Rosa, Jose,&McKay, Christopher P..(2012).Decomposition of sodium formate and L- and D-alanine in the Pampas de La Joya soils: Implications as a new geochemical analogue to Martian regolith.ADVANCES IN SPACE RESEARCH,49(5),821-833. |
MLA | Valdivia-Silva, Julio E.,et al."Decomposition of sodium formate and L- and D-alanine in the Pampas de La Joya soils: Implications as a new geochemical analogue to Martian regolith".ADVANCES IN SPACE RESEARCH 49.5(2012):821-833. |
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