Arid
DOI10.1016/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
ISSN0273-1177
EISSN1879-1948
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.
条目包含的文件
条目无相关文件。
个性服务
推荐该条目
保存到收藏夹
导出为Endnote文件
谷歌学术
谷歌学术中相似的文章
[Valdivia-Silva, Julio E.]的文章
[Navarro-Gonzalez, Rafael]的文章
[de la Rosa, Jose]的文章
百度学术
百度学术中相似的文章
[Valdivia-Silva, Julio E.]的文章
[Navarro-Gonzalez, Rafael]的文章
[de la Rosa, Jose]的文章
必应学术
必应学术中相似的文章
[Valdivia-Silva, Julio E.]的文章
[Navarro-Gonzalez, Rafael]的文章
[de la Rosa, Jose]的文章
相关权益政策
暂无数据
收藏/分享

除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。