Results 81 to 90 of about 33,014 (253)

Constraining climate sensitivity and continental versus seafloor weathering using an inverse geological carbon cycle model

Nature Communications, 2017
The influence of tectonics, continental weathering, and seafloor weathering in the geological carbon cycle remain unclear. Here, the authors develop a new carbon cycle model and, through comparison with proxy data, critically evaluate the influence of ...
Joshua Krissansen-Totton, David C. Catling   +1 more
doaj   +1 more source

A New Record for Microbial Perchlorate Tolerance: Fungal Growth in NaClO₄ Brines and its Implications for Putative Life on Mars

Life, 2020
The habitability of Mars is strongly dependent on the availability of liquid water, which is essential for life as we know it. One of the few places where liquid water might be found on Mars is in liquid perchlorate brines that could form via ...
Jacob Heinz, Tim Krahn, Dirk Schulze-Makuch   +2 more
doaj   +1 more source

Variations in climate habitability parameters and their effect on Earth's biosphere during the Phanerozoic Eon

Scientific Reports, 2023
Essential insights on the characterization and quality of a detectable biosphere are gained by analyzing the effects of its environmental parameters. We compiled environmental and biological properties of the Phanerozoic Eon from various published data ...
Iva Vilović, Dirk Schulze-Makuch, René Heller   +2 more
doaj   +1 more source

Microbial preference for chlorate over perchlorate under simulated shallow subsurface Mars-like conditions

Scientific Reports
The Martian surface and shallow subsurface lacks stable liquid water, yet hygroscopic salts in the regolith may enable the transient formation of liquid brines.
Florian Carlo Fischer, Dirk Schulze-Makuch, Jacob Heinz   +2 more
doaj   +1 more source

Dependence of Biological Activity on the Surface Water Fraction of Planets

, 2019
One of the unique features associated with the Earth is that the fraction of its surface covered by land is comparable to that spanned by its oceans and other water bodies.
Lingam, Manasvi, Loeb, Abraham
core   +1 more source

Investigating the Composition and Metabolic Potential of Microbial Communities in Chocolate Pots Hot Springs

Frontiers in Microbiology, 2018
Iron (Fe) redox-based metabolisms likely supported life on early Earth and may support life on other Fe-rich rocky planets such as Mars. Modern systems that support active Fe redox cycling such as Chocolate Pots (CP) hot springs provide insight into how ...
Nathaniel W. Fortney, Shaomei He, Shaomei He, Brandon J. Converse, Eric S. Boyd, Eric E. Roden   +5 more
doaj   +1 more source

The Cyborg Astrobiologist: Testing a Novelty-Detection Algorithm on Two Mobile Exploration Systems at Rivas Vaciamadrid in Spain and at the Mars Desert Research Station in Utah

, 2009
(ABRIDGED) In previous work, two platforms have been developed for testing computer-vision algorithms for robotic planetary exploration (McGuire et al. 2004b,2005; Bartolo et al. 2007).
A. Bonnici, Aha, Alexander, B.H. Foing, Barnes, Bilbey, C. Gross, Chen, E. Díaz-Martínez, H. Ritter, J. Ontrup, J. Ormö, King, L. Wendt, M. Oesker, McGreevy, P.C. McGuire, R. Bose, R. Haschke, Rae, S. Walter, V. Souza-Egipsy   +21 more
core   +1 more source

Polysphaeroides filiformis, a proterozoic cyanobacterial microfossil and implications for cyanobacteria evolution

iScience
Summary: Deciphering the fossil record of cyanobacteria is crucial to understand their role in the chemical and biological evolution of the early Earth.
Catherine F. Demoulin, Marie Catherine Sforna, Yannick J. Lara, Yohan Cornet, Andrea Somogyi, Kadda Medjoubi, Daniel Grolimund, Dario Ferreira Sanchez, Remi Tucoulou Tachoueres, Ahmed Addad, Alexandre Fadel, Philippe Compère, Emmanuelle J. Javaux   +12 more
doaj   +1 more source

Motivation, demographics, and engagement during COVID-19 in an astrobiology massive open online course

Physical Review Physics Education Research
Massive 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, Molly N. Simon, Sanlyn Buxner, Matthew Wenger, Chris Impey   +4 more
doaj   +1 more source

The microbial ferrous wheel in a neutral pH groundwater seep

Frontiers in Microbiology, 2012
Evidence for microbial Fe redox cycling was documented in a circumneutral pH groundwater seep near Bloomington, Indiana. Geochemical and microbiological analyses were conducted at two sites, a semi-consolidated microbial mat and a floating puffball ...
Eric eRoden, Joyce M McBeth, Marco eBlothe, Elizabeth Maria Percak-Dennett, Emily J Fleming, Rebecca R Holyoke, George W. Luther, David eEmerson   +7 more
doaj   +1 more source