Results 71 to 80 of about 29,391 (220)

Stable Nitrogen Isotope Analysis of Amino Acids by Orbitrap Mass Spectrometry: Application for Extraterrestrial Samples

Rapid Communications in Mass Spectrometry, Volume 39, Issue 23, 15 December 2025.
ABSTRACT Background Obtaining isotopic data on soluble organic compounds, such as amino acids, in extraterrestrial samples is crucial for understanding their origins, prebiotic chemistry, and potential contamination. Conventional GC‐IRMS requires grams of material to measure isotopic compositions, limiting the analysis of low‐concentration organics in ...
O. M. McIntosh, A. A. Baczynski, M. Matney, H. L. McLain, K. K. Farnsworth, J. P. Dworkin, D. P. Glavin, J. E. Elsila, H. Xie, K. H. Freeman   +9 more
wiley   +1 more source

Exploring lipid diversity and minimalism to define membrane requirements for synthetic cells

FEBS Letters, Volume 599, Issue 24, Page 3569-3590, December 2025.
Designing the lipid membrane of synthetic cells is a complex task, in which its various roles (among them solute transport, membrane protein support, and self‐replication) should all be integrated. In this review, we report the latest top‐down and bottom‐up advances and discuss compatibility and complexity issues of current engineering approaches ...
Sergiy Gan, Victoria Scarpelli, Marten Exterkate   +2 more
wiley   +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

A Personal Voyage Among Earth and Space Physics Disciplines

Perspectives of Earth and Space Scientists, Volume 6, Issue 1, December 2025.
Abstract I have organized my thoughts in an autobiographical way in relation to the several distinct phases of my career encompassing Earth and space physics. I discuss atmospheric and space physics topics of interest to me in an international context, and I emphasize the value of community activities and international conferences for the interchange ...
Michael J. Rycroft
wiley   +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

Oxychlorine Species on Mars: A Review

Reviews of Geophysics, Volume 63, Issue 4, December 2025.
Abstract Oxychlorine species (mainly perchlorate and chlorate) have been identified at multiple locations on the surface of Mars by both orbiter and in situ rovers. They have also been found in martian meteorites. Cl‐isotopes in meteoritic minerals suggest that an oxychlorine cycle has been operating on the martian surface for the last ∼4 billion years.
Kaushik Mitra
wiley   +1 more source

Exoplanets and SETI

, 2017
The discovery of exoplanets has both focused and expanded the search for extraterrestrial intelligence. The consideration of Earth as an exoplanet, the knowledge of the orbital parameters of individual exoplanets, and our new understanding of the ...
A Loeb, A Przybylski, A Stevens, A Wolszczan, BM Oliver, C Majeau, CD Dressing, CE Singer, CR Cowley, DH Forgan, DJ Kessler, DM Kipping, DP Whitmire, EA Petigura, EJ Korpela, FJ Dyson, G Cocconi, GR Harp, GW Pace, H Isaacson, H Kawahara, HA Knutson, HW Lin, I Shklovskiĭ, J Freeman, J Guillochon, J Maire, J Schneider, J Tarter, J Wit de, JF Kasting, JR Kuhn, JT Wright, L Kreidberg, LFA Arnold, LN Filippova, LN Filippova, M Lingam, MC Turnbull, MC Turnbull, NB Cowan, PV Makovetskii, PV Makovetskii, RA Carrigan Jr, RA Carrigan Jr, RHD Corbet, RN Bracewell, RS Dixon, S Shostak, T Henry, T Schelling, WA Traub, Z Osmanov   +52 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

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

Rethinking “Prebiotic Chemistry”

Perspectives of Earth and Space Scientists, Volume 6, Issue 1, December 2025.
Abstract In origins‐of‐life research, the term “prebiotic chemistry” is commonly used to describe processes thought to be related to or required for the emergence of life. However, it suffers from several potential drawbacks that have caused the present group of authors to rethink their usage of the term.
Michael L. Wong, Madeline Christensen, Stuart Bartlett   +2 more
wiley   +1 more source