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03/2012
Molecular fossils are particularly valuable ancient biosignatures that can provide key insight about microbial sources and ecology in early Earth studies. In... 
Exobiology
Report
01/2004
This thesis explores the microbial ecology of depositional environments in order to shed light on the 40‰ range of organic-carbon isotope compositions... 
Biogeochemistry | Geochemistry
Dissertation
Thesis (Ph.D.)--Pennsylvania State University, 2004. Mode of access: World Wide Web. 
Dissertation
01/2004, Volume 68, Issue 5
This thesis explores the microbial ecology of depositional environments in order to shed light on the 40{per mille} range of organic-carbon isotope... 
Dissertation
2008, Space Sciences Series of ISSI, ISBN 9780387775159, Volume 25
The geological preservation of lipids from the cell membranes of organisms bestows a precious record of ancient life, especially for the Precambrian eon (>542... 
Biochemistry, general | Planetology | Astrobiology | Physics | Astronomy
Book Chapter
Journal of Geophysical Research: Planets, 10/2013, Volume 118, Issue 10
A single scoop of the Rocknest aeolian deposit was sieved (less than 150 micrometers), and four separate sample portions, each with a mass of approximately 50... 
Lunar and Planetary Science and Exploration
Journal Article
12/2013
Drilled samples of mudstone from the Sheepbed unit at Yellowknife Bay were analyzed by MSL instruments including the Sample Analysis at Mars (SAM) and... 
Lunar and Planetary Science and Exploration
Report
01/2004, Volume 68, Issue 5
This thesis explores the microbial ecology of depositional environments in order to shed light on the 40[per range of organic-carbon isotope compositions... 
Book Chapter
12/2013
The Sample Analysis at Mars (SAM) instrument suite on the Mars Science Laboratory (MSL) Curiosity Rover detected both reduced and oxidized nitrogen-bearing... 
Lunar and Planetary Science and Exploration
Report
06/2011
The environmental signatures for habitability are not necessarily biosignatures, even though on Earth, they are definitive proof of habitability. It is the... 
Exobiology
Report
01/2011
Spatiotemporal variability in the carbon isotope composition of sedimentary organic matter (OM) preserves information about the evolution of the biosphere and... 
Geosciences (General)
Report
01/2012
The Sample Analysis at Mars (SAM) investigation of the Mars Science Laboratory (MSL) addresses the chemical and isotopic composition of the atmosphere and... 
Lunar and Planetary Science and Exploration
Report
General Meeting of the NASA Astrobiology Insititute; 01 Apr. 2001, 04/2001, pp. 261 - 262
Little is known about the extent of microbial metabolic diversity in the Archean. Detection of indigenous molecular fossils and the assessment of the isotopic... 
Conference Proceeding
Science, ISSN 0036-8075, 2014, Volume 343, Issue 6169, pp. 1245267 - 1245267
Journal Article
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