Results 11 to 20 of about 7,007 (208)
The history and philosophy of biosignatures [PDF]
, 2018 This chapter examines the human search, understanding, and interpretation of biosignatures. It deals with four epistemological issues in the search for signs of life in outer space: (1) conceptualization, how we form concepts of life in astrobiology, how
Dunér, David +3 more
core +4 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. The
Dunér, David
core +4 more sources
Proto-Biosignatures and Planetary Geochemical Metabolism: A Thermodynamic Screening Model of Prebiotic Geochemical Organization [PDF]
LifeAstrobiological observations usually return atmospheric, mineralogical, molecular, isotopic, or textural states rather than organisms. The interval between environmental habitability and confirmed life detection is therefore an evidential problem.
Sebastiano Ettore Spoto
doaj +2 more sources
Biomarkers on the Icy Jovian Moons: Can Europa Also Provide Insights into Life’s Origin? [PDF]
LifeWithin the payloads of JUICE and Europa Clipper, there are instruments suitable for the search of specific biosignatures that can diagnose life tracks in two ways.
Julian Chela-Flores +2 more
doaj +2 more sources
Alternative Methylated Biosignatures I: Methyl Bromide, A Capstone Biosignature [PDF]
The Astrophysical Journal, 2022 The first potential exoplanet 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.
Parenteau, Mary N +6 more
core +7 more sources
, 2011 Biosignatures are morphological, chemical (organic, elemental and/or mineral), and isotopic traces of organisms preserved in minerals, sediments, and rocks.
CAVALAZZI, BARBARA +4 more
core +4 more sources
Multi-technique characterization of iron reduction by an Antarctic Shewanella: an analog system for putative Martian biosignature identification [PDF]
Applied and Environmental MicrobiologyMicrobes from terrestrial extreme environments enable testing of biosignature production in conditions relevant to astrobiological targets. Mars, which was likely more conducive to life during early warmer and wetter epochs, has inspired missions that ...
Jacob M. C. Shaffer +9 more
doaj +2 more sources
Life, 2021 Identifying microbial fossils in the rock record is a difficult task because they are often simple in morphology and can be mimicked by non-biological structures.
Andrew Gangidine +2 more
exaly +3 more sources
A Deep Nonlinear Subspace Modeling and Reconstruction for Diffusion-Weighted Imaging Using Denoising Auto-Encoder. [PDF]
Magn Reson MedABSTRACT Purpose To present a novel, nonlinear subspace modeling and joint k–q‐space reconstruction technique for high‐resolution, multi‐band, multi‐shell diffusion‐weighted imaging (DWI). Methods High b‐value (> 1000 s/mm2), high resolution DWI has the drawback of generally low signal‐to‐noise ratios (SNRs).
Glaser J +4 more
europepmc +2 more sources
, 2017 Life has likely coevolved with the Earth system in time in various ways. Our oxygen-rich atmosphere and the protective ozone layer are mainly the result of photosynthetic activity.
Grenfell, J L, John Lee Grenfell
core +4 more sources