Results 111 to 120 of about 27,747 (265)
Perchlorates on Mars enhance the bacteriocidal effects of UV light
Scientific Reports, 2017 Perchlorates have been identified on the surface of Mars. This has prompted speculation of what their influence would be on habitability. We show that when irradiated with a simulated Martian UV flux, perchlorates become bacteriocidal.
Jennifer Wadsworth, Charles S. Cockell
doaj +1 more source
Early evolution of purple retinal pigments on Earth and implications for exoplanet biosignatures
, 2018 We propose that retinal-based phototrophy arose early in the evolution of life on Earth, profoundly impacting the development of photosynthesis and creating implications for the search for life beyond our planet.
DasSarma, Shiladitya +1 more
core +1 more source
Microbial Biotechnology, Volume 18, Issue 3, March 2025.In this study, we performed a spaceflight experiment with B. subtilis TD7 strain, and findings showed that spaceflight resulted in slower growth, higher cell density, different morphology, decreased biofilm formation and lipopeptide metabolism. Transcriptomic analysis indicated that these lipopeptide changes were related to the upregulated genes in ...
Wan‐Qi Qin +6 more
wiley +1 more source
Generalized Stoichiometry and Biogeochemistry for Astrobiological Applications [PDF]
arXiv, 2020 A central need in the field of astrobiology is generalized perspectives on life that make it possible to differentiate abiotic and biotic chemical systems. A key component of many past and future astrobiological measurements is the elemental ratio of various samples.
arxiv
Astrobiological Effects of F, G, K and M Main-Sequence Stars [PDF]
, 2007 We focus on the astrobiological effects of photospheric radiation produced by main-sequence stars of spectral types F, G, K, and M. The photospheric radiation is represented by using realistic spectra, taking into account millions or hundred of millions of lines for atoms and molecules.
arxiv +1 more source
, 2010 Following on from ideas presented in a recent paper by Schneider et al. (2010) on "The Far Future of Exoplanet Direct Characterization", I argue that they have exaggerated the technical obstacles to performing such 'direct characterization' by means of ...
Bond A. +10 more
core +1 more source
Geobiology, Volume 23, Issue 2, March/April 2025.ABSTRACT Methanogenic archaea were likely among the earliest organisms to populate the Earth, perhaps contributing to the Archaean greenhouse effect; they are also widely discussed as analogues to any potential life on Mars. However, fossil evidence of archaea has been difficult to identify in the rock record, perhaps because their preservation ...
Sigrid Huld +3 more
wiley +1 more source
Evolution of the problem "search for life in the Universe" from some examples [PDF]
arXiv, 2012 On the occasion of the 50th anniversary of the Drake formula, it appears interesting to briefly review the history of Astrobiology from the origins up to the epoch of the Drake formula. After recalling the main steps of this history during Antiquity, the Middle Ages, and the Renaissance, we point out some little known or unknown studies during the ...
arxiv
The Entropy Principle and the Influence of Sociological Pressures on SETI [PDF]
, 2010 We begin with the premise that the law of entropy could prove to be fundamental for the evolution of intelligent life and the advent of technological civilization. Building on recent theoretical results, we combine a modern approach to evolutionary theory with Monte Carlo Realization Techniques.
arxiv +1 more source
Physical Review Physics Education ResearchMassive open online courses (MOOCs) experienced a resurgence in popularity due to the COVID-19 pandemic. In this work, we studied participants in an astrobiology MOOC offered on Coursera since April 2019.
Skylar Grayson +4 more
doaj +1 more source