Results 51 to 60 of about 3,089 (177)

Microbes from ambient-pressure analogues offer insights into possible life in Europa’s high-pressure subsurface ocean

Frontiers in Microbiology
Under its thick ice layer, Europa contains a shielded liquid water ocean where habitable conditions may exist. To effectively assess the habitability of this environment and the implications on putative biosignature formation, it is essential to ...
Alvaro del Moral, Dominic Siggs, Michael C. Macey, Mark G. Fox-Powell, Victoria K. Pearson, Karen Olsson-Francis   +5 more
doaj   +1 more source

Quantification of the Tissue Sodium Concentration in the Human Calf at 7T With Reduced Acquisition Time: Influence of the Nominal Spatial Resolution

NMR in Biomedicine, Volume 39, Issue 9, September 2026.
Fast 23Na MRI of the human calf at 7T was achieved by reducing nominal spatial resolution. Shorter measurement times can improve clinical feasibility of 23Na MRI while preserving reliable quantification of apparent tissue sodium concentration through partial volume, relaxation, and B0/B1 corrections.
Jordan M. Höhn, Tobias Wilferth, Lena V. Gast, Teresa Gerhalter, Christoph Kopp, Michael Uder, Armin M. Nagel   +6 more
wiley   +1 more source

Oxidation of Aqueous Sulfide by Chlorate: Implications for Native Sulfur Formation on Mars

Geophysical Research Letters, Volume 53, Issue 14, 28 July 2026.
Abstract The recent discovery of native sulfur (“sulfur stones” consist of elemental sulfur) by Curiosity rover in the Gale Crater has sparked considerable research interest toward identifying its formation mechanisms that could generate novel insights into Martian sulfur cycling.
J. Wang, S. Kim, Z. Gold, R. L. Cheng, C. Muñoz‐Saez, N. M. Fernandez   +5 more
wiley   +1 more source

Detecting signs of life in biotic–abiotic mixtures using pyrolysis–gas chromatography–mass spectrometry and machine learning

Frontiers in Astronomy and Space Sciences
Biosignature detection is at the forefront of modern astrobiology and paleobiology research. Previous studies have demonstrated that machine learning models trained on data from pyrolysis–gas chromatography–mass spectrometry (py–GC–MS) can distinguish ...
Emersyn Slaughter, Emersyn Slaughter, Emersyn Slaughter, Grethe Hystad, George Cody, Anirudh Prabhu, H. James Cleaves, H. James Cleaves, Robert M. Hazen, Michael L. Wong, Michael L. Wong   +10 more
doaj   +1 more source

Unveiling microbial preservation under hyperacidic and oxidizing conditions in the Oligocene Rio Tinto deposit

Scientific Reports, 2021
The preservation of biosignatures on Mars is largely associated with extensive deposits of clays formed under mild early Noachian conditions (> 3.9 Ga). They were followed by widespread precipitation of acidic sulfates considered adverse for biomolecule ...
David C. Fernández-Remolar, Daniel Carrizo, Mourad Harir, Ting Huang, Ricardo Amils, Philippe Schmitt-Kopplin, Laura Sánchez-García, David Gomez-Ortiz, Per Malmberg   +8 more
doaj   +1 more source

Beyond the Outburst: Charting a New Frontier for Understanding and Treating Irritability in Autistic Adults

Autism Research, Volume 19, Issue 7, July 2026.
ABSTRACT Irritability is a prevalent and impairing feature associated with autism, yet remains poorly understood, particularly in adults. Drawing heavily on insights translated from pediatric and transdiagnostic literatures, we propose that irritability in autistic individuals often reflects a psychophysiological stress or threat response, rooted in a ...
Hsiang‐Yuan Lin, Arthur N. Westover, Amy S. F. Lutz, Manish K. Jha   +3 more
wiley   +1 more source

Increased Stability in Carbon Isotope Records Reflects Emerging Complexity of the Biosphere

Frontiers in Earth Science, 2019
Preference for certain stable isotopes (isotope fractionation) during enzyme-mediated reactions is a universal aspect of life. For instance, carbon isotopes are fractionated during anabolic (e.g., photosynthate production) and catabolic (e.g ...
Martin Schobben, Bas van de Schootbrugge
doaj   +1 more source

Fat/Water Separation at 7 T Using a 3D Radial Sequence With Quasi‐Continuous Echo Times

Magnetic Resonance in Medicine, Volume 96, Issue 1, Page 96-108, July 2026.
ABSTRACT Purpose To achieve a reliable fat/water separation (FWS) at 7 T using a new 3D radial sequence and reconstruction workflow with quasi‐continuous TE sampling. Methods A 3D radial density‐adapted sequence with quasi‐continuous TE sampling was developed for a 7 T whole‐body MRI system.
Matthias Rohe, Katharina Tkotz, Armin M. Nagel, Stefan Sommer, Max Brockmüller, Florian Knoll, Michael Uder, Nico Egger, Frederik B. Laun, Tobias Wilferth   +9 more
wiley   +1 more source

Assessing the utility of trace and rare earth elements as biosignatures in microbial iron oxyhydroxides

Frontiers in Earth Science, 2015
Microbial iron oxyhydroxides are common deposits in natural waters, recent sediments and mine drainage systems and often contain significant accumulations of trace and rare earth elements (TREE). TREE patterns are widely used to characterize minerals and
Christine eHeim, Klaus eSimon, Danny eIonescu, Andreas eReimer, Dirk eDe Beer, Nadia-Valérie eQuéric, Joachim eReitner, Volker eThiel   +7 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