Results 41 to 50 of about 4,756 (134)

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

The Illusion of Structural Order: Evaluating the Suppression of Amorphous Carbon Black Pigment Bands in SSE‐Processed Handheld Raman Spectra

Journal of Raman Spectroscopy, Volume 57, Issue 7, Page 1150-1160, July 2026.
The handheld Raman with SSE system efficiently mitigates fluorescence; however, it may also bias the Raman response towards graphitic domains in carbon‐based black pigments, thereby concealing amorphous carbon contributions that are critical for pigment type identification.
Zeynep Alp, Christoph Herm
wiley   +1 more source

Life on Mars? The physiological perspective

Experimental Physiology, EarlyView.
Ronan M. G. Berg, Damian M. Bailey
wiley   +1 more source

Correlative X‐Ray and Neutron Tomography of Microbial Biosignatures: Perspectives for Mars Sample Return

Earth and Space Science, Volume 13, Issue 7, July 2026.
Abstract Mars Sample Return (MSR) is the next major frontier in Mars exploration, through which advanced laboratory instrumentation will be used to study Martian samples and answer key questions surrounding Mars' planetary evolution and astrobiology. Non‐destructive, high‐resolution imaging will be critical for preliminary MSR analyses.
Sylvia Olewinski, Imran A. Rahman, Anna Fedrigo, Peta A. Hayes, Caroline L. Smith, Keyron Hickman‐Lewis   +5 more
wiley   +1 more source

Academic Self-Efficacy in Peruvian University Students through an Astrobiological Stratospheric Balloon Project [PDF]

European Journal of STEM Education
This study investigated the effect of a stratospheric balloon project focused on astrobiology on the academic self-efficacy of university students in Peru.
Octavio Alfonso Chon-Torres, Julio Cesar Ramos Ramirez, Rosana Aurora Choy Vessoni   +2 more
doaj   +1 more source

How Does Ice Shell Geometry Shape Ocean Dynamics on Icy Moons?

Journal of Geophysical Research: Planets, Volume 131, Issue 7, July 2026.
Abstract A poleward‐thinning ice shell can drive circulation in the subsurface oceans of icy moons by imposing a meridional temperature gradient–colder at the equator than the pole–through the freezing point suppression due to pressure. This temperature gradient sets a buoyancy gradient, whose sign depends on the thermal expansion coefficient ...
Yixiao Zhang, Wanying Kang, John Marshall   +2 more
wiley   +1 more source

Viability and Motility of Escherichia coli Under Elevated Martian Salt Stresses

Life
This study investigates the effects of three Martian-relevant salts—sodium chlorate, sodium perchlorate, and sodium chloride—on the viability and motility of Escherichia coli, a model organism for understanding microbial responses to environmental stress.
Max Riekeles, Berke Santos, Sherif Al-Morssy Youssef, Dirk Schulze-Makuch   +3 more
doaj   +1 more source

Groundwater Connectivity and Buffering in Western Australian Hypersaline Lakes: Implications for Late‐Stage Martian Lacustrine Systems

Earth and Space Science, Volume 13, Issue 7, July 2026.
Abstract Thousands of saline to hypersaline lakes exist across the Yilgarn Craton in Western Australia, representing potential Mars analogs with diverse and varying salinity, pH, and oxygen conditions that remain poorly constrained. Here, we report geochemical trends in lake waters that vary across wet‐dry cycles as well as with regional location and ...
T. A. Plattner, B. E. Schmidt, N. M. Fernandez, P. T. Doran, M. A. Birmingham, J. M. Weber, A. Celestian, E. D. Ingall, J. S. Bowman, S. M. Som, A. Odenheimer, T. Bornholdt, C. Sephus, H. T. Jamison, K. Russo, S. Buessecker, L. A. Fisher, B. Klempay, E. R. Paris, E. J. Skoog, M. M. Weng, C. Pozarycki, A. T. Schartup, C. E. Carr, J. J. Wray, F. Rivera‐Hernández, E. Quartini   +26 more
wiley   +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

Evolution of a Point Plume in a Rotating Unstratified Fluid Overlain by a Stratified Layer: Scaling and Implications for Icy Satellites

Journal of Geophysical Research: Planets, Volume 131, Issue 7, July 2026.
Abstract Plumes that rise through an unstratified layer and penetrate into an adjacent stably stratified layer are ubiquitous in geophysical and planetary environments, including the subsurface oceans of icy satellites such as Europa, Enceladus, and Titan. In this study, we investigate the evolution of such plumes from isolated buoyant sources, both in
Shuang Wang, Wanying Kang, Yixiao Zhang, John Marshall   +3 more
wiley   +1 more source