Results 141 to 150 of about 1,972 (193)

Carbon monoxide dehydrogenase-encoding microorganisms in volcanic astrobiological analogues: an enzyme system to investigate the evolution of life. [PDF]

FEMS Microbiol Ecol
Latorre V, Vázquez-Campos X, Ferrari B, Hernández M.   +3 more
europepmc   +1 more source

Effects of simulated Martian environmental stressors on specific human pathogen-immune system interactions. [PDF]

mBio
Zaccaria T, Bulut Ö, Ferreira AV, Dona M, Langereis JD, Mesman RJ, Wesseling J, van Niftrik L, Netea MG, Rettberg P, Beblo-Vranesevic K, de Jonge MI, Domínguez-Andrés J.   +12 more
europepmc   +1 more source

In This Issue. [PDF]

Proc Natl Acad Sci U S A
europepmc   +2 more sources

Asteroid sample return missions are critical for understanding our Solar System. [PDF]

Nat Commun
Bates H.
europepmc   +1 more source

Maize (Zea mays L.) survival on Mars depends on regolith's chemical composition rather than reduced gravity or lack of magnetic field. [PDF]

Sci Rep
Servetto GP, Botta P, Rossi G, Bernasconi A, Caldo F, Vigliaturo R, Maffei ME.   +6 more
europepmc   +1 more source

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The Martian atmosphere: Some unanswered questions

Journal of Molecular Evolution, 1979
The study of the Martian atmosphere and its significance for the possible origin of life on Mars is still very incomplete. Further investigations are needed to define the total volatile inventory, the early history of the atmosphere, and the relationship of the atmosphere to the question of indigenous life.
Tobias Owen, T Owen, Owen Tobias
exaly   +3 more sources

Photochemistry of HCl in the martian atmosphere

Icarus, 2022
The recent discovery of HCl on Mars (Korablev et al. 2021, Olsen et al. 2021) indicates its strong seasonal variations and correlation with dust. To study this idea, we develop photochemical models for summer midlatitudes at aphelion and perihelion. We assume that HCl is formed in heterogeneous reactions of FeCl3 and/or NaCl in the dust with H, and the
openaire   +1 more source

A Photochemical Model of the Martian Atmosphere

Icarus, 1994
The factors governing the amounts of CO, O2, and O3 in the martian atmosphere are investigated using a minimally constrained, one-dimensional photochemical model. We find that the incorporation of temperature-dependent CO2 absorption cross sections leads to an enhancement in the water photolysis rate, increasing the abundance of OH radicals to the ...
Nair, Hari, Allen, Mark, Anbar, Ariel D., Yung, Yuk L., Clancy, R. Todd   +4 more
openaire   +3 more sources

Martian Atmospheric Erosion Rates

Science, 2007
Mars was once wet but is now dry, and the fate of its ancient carbon dioxide atmosphere is one of the biggest puzzles in martian planetology. We have measured the current loss rate due to the solar wind interaction for different species: Q(O + ) = 1.6·10 23 per second = 4 grams per second (g ...
Stas, Barabash, Andrei, Fedorov, Rickard, Lundin, Jean-Andre, Sauvaud   +3 more
openaire   +2 more sources