Results 21 to 30 of about 7,177 (211)
Morphological Biosignatures in Volcanic Rocks – Applications for Life Detection on Mars
Frontiers in Earth Science, 2019 The exploration of Mars is largely based on comparisons with Earth analog environments and processes. The up-coming NASA Mars mission 2020 and ExoMars 2020 has the explicit aim to search for signs of life on Mars.
Magnus Ivarsson +4 more
doaj +1 more source
Network and biosignature analysis for the integration of transcriptomic and metabolomic data to characterize leaf senescence process in sunflower [PDF]
, 2016 In recent years, high throughput technologies have led to an increase of datasets from omics disciplines allowing the understanding of the complex regulatory networks associated with biological processes.
Di Rienzo, Julio Alejandro +5 more
core +5 more sources
Frontiers in Astronomy and Space Sciences, 2021 The signatures of element isotope fractionation can be used for the indirect identification of extant or extinct life on planetary surfaces or their moons.
Andreas Riedo +9 more
doaj +1 more source
Remote Sensing of Chiral Signatures on Mars [PDF]
, 2012 We describe circular polarization as a remote sensing diagnostic of chiral signatures which may be applied to Mars. The remarkable phenomenon of homochirality provides a unique biosignature which can be amenable to remote sensing through circular ...
Barron +30 more
core +2 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
High Stellar FUV/NUV Ratio and Oxygen Contents in the Atmospheres of Potentially Habitable Planets [PDF]
, 2013 Recent observations of several planet-hosting M dwarfs show that most have FUV/NUV flux ratios 1000 times greater than that of the Sun. Here we show that the atmospheric oxygen contents (O2 and O3) of potentially habitable planets in this type of UV ...
France, Kevin +4 more
core +2 more sources
Geochemistry, Geophysics, Geosystems, 2021 Pyrite (FeS2) is the most common iron sulfide on the Earth's surface and has widely been used as a paleo‐environmental proxy. Yet the information recorded by pyrite depends on whether it was formed through abiotic or biogenic routes.
Arnaud Duverger +4 more
doaj +1 more source
The Role of N2 as a Geo-Biosignature for the Detection and Characterization of Earth-like Habitats [PDF]
, 2019 Since the Archean, N2 has been a major atmospheric constituent in Earth's atmosphere. Nitrogen is an essential element in the building blocks of life, therefore the geobiological nitrogen cycle is a fundamental factor in the long term evolution of both ...
Cubillos, Patricio E. +6 more
core +2 more sources
Expanding the taxonomic and environmental extent of an underexplored carbon metabolism—oxalotrophy
Frontiers in Microbiology, 2023 Oxalate serves various functions in the biological processes of plants, fungi, bacteria, and animals. It occurs naturally in the minerals weddellite and whewellite (calcium oxalates) or as oxalic acid.
Alexander Sonke +1 more
doaj +1 more source
Frontiers in Microbiology, 2022 Deserts represent extreme habitats where photosynthetic life is restricted to the lithic niche. The ability of rock-inhabiting cyanobacteria to modify their photosynthetic apparatus and harvest far-red light (near-infrared) was investigated in 10 strains
Daniela Billi +10 more
doaj +1 more source