Results 11 to 20 of about 3,089 (177)
Earth and Space ScienceMars Sample Return (MSR) is the next major frontier in Mars exploration, through which advanced laboratory instrumentation will be used to study Martian samples and answer key questions surrounding Mars' planetary evolution and astrobiology.
Sylvia Olewinski +5 more
doaj +2 more sources
Is There Such a Thing as a Biosignature? [PDF]
Astrobiology, 2023 The concept of a biosignature is widely used in astrobiology to suggest a link between some observation and a biological cause, given some context. The term itself has been defined and used in several ways in different parts of the scientific community involved in the search for past or present life on Earth and beyond. With the ongoing acceleration in
Malaterre, Christophe +13 more
openaire +6 more sources
Astrobiology, 2023 Life on Earth relies on mechanisms to store heritable information and translate this information into cellular machinery required for biological activity. In all known life, storage, regulation, and translation are provided by DNA, RNA, and ribosomes. Life beyond Earth, even if ancestrally or chemically distinct from life
Jordan M. McKaig +2 more
openaire +3 more sources
Lethaia, EarlyView., 2021 Biomineralization is a generic term used to indicate biological‐mediated mineral formation. In carbonate mineralization, nucleation of crystals can be: (1) controlled directly by the organisms, like in the skeletal formation of most metazoans; (2) induced by microbial communities, by indirect precipitation mediated by their metabolic activities; or (3)
Adriano Guido +4 more
wiley +1 more source
On biosignatures for Mars [PDF]
International Journal of Astrobiology, 2021 AbstractIn this work, we address the difficulty of reliably identifying traces of life on Mars. Several independent lines of evidence are required to build a compelling body of proof. In particular, we underline the importance of correctly interpreting the geological and mineralogical context of the sites to be explored for the presence of ...
Westall, Frances +5 more
openaire +2 more sources
Toward a Biosignature for Suicide [PDF]
American Journal of Psychiatry, 2014 Suicide, a major cause of death worldwide, has distinct biological underpinnings. The authors review and synthesize the research literature on biomarkers of suicide, with the aim of using the findings of these studies to develop a coherent model for the biological diathesis for suicide.The authors examined studies covering a large range of ...
Maria A, Oquendo +6 more
openaire +2 more sources
Alternative Methylated Biosignatures. I. Methyl Bromide, a Capstone Biosignature
The Astrophysical Journal, 2022 Abstract The first potential exoplanetary biosignature detections are likely to be ambiguous due to the potential for false positives: abiotic planetary processes that produce observables similar to those anticipated from a global biosphere. Here we propose a class of methylated gases as corroborative “capstone” biosignatures.
Michaela Leung +3 more
openaire +6 more sources
PLoS ONE, 2018 Microbial life can leave various traces (or biosignatures) in rocks, including biotic alteration textures, biominerals, enrichments of certain elements, organic molecules, or remnants of DNA.
Andreas Türke +2 more
doaj +1 more source
Exoplanet Biosignatures: Understanding Oxygen as a Biosignature in the Context of Its Environment [PDF]
Astrobiology, 2018 55 pages. The paper is the second in a series of 5 review manuscripts of the NExSS Exoplanet Biosignatures Workshop.
Meadows, Victoria S +16 more
openaire +7 more sources
SEMIOTICS OF BIOSIGNATURES [PDF]
Southern Semiotic Review, 2018 This article examines the interpretation of biosignatures, the signs of life that could bedetected in outer space. In astrobiology biosignatures could be of various kinds, fossils, molecules, traces, artefacts, structures, electromagnetic waves, etc.
openaire +2 more sources