Results 41 to 50 of about 3,923 (192)

Determine the Elemental Composition of Minerals From Complex Solid‐Solution Series by Raman Spectroscopy: Implications for Mars Exploration Missions

Journal of Raman Spectroscopy, EarlyView.
This study presents a hierarchical Raman‐based classification model for determining the elemental composition of garnets within complex solid‐solution systems. The workflow combines spectral preprocessing, dimensionality reduction, and two‐level classification: first distinguishing between pyralspite and ugrandite groups, and then classifying ...
Sofia Julve‐Gonzalez, Jose Antonio Manrique, Marco Veneranda, Pilar Renedo, Paula Xiaozhen Vega, Iván Reyes‐Rodríguez, María Mayoral, Sergio Jiménez, Lidia Asenjo, Aurelio Sanz‐Arranz, Elena Charro Huerga, Jaime Delgado Iglesias, Olga Prieto‐Ballesteros, Andoni Moral, Emmanuel Alexis Lalla, Belen Barrios‐Areinamo, Fernando Rull, Guillermo Lopez‐Reyes   +17 more
wiley   +1 more source

Current understanding of electroautotrophy and its relevance in astrobiology‐related research

mLife, EarlyView.
Abstract Electroautotrophy—the use of extracellular electrons as the primary energy source for autotrophic metabolism—remains understudied compared to photoautotrophy and chemoautotrophy. Its occurrence in deep‐earth and deep‐sea environments suggests profound implications for astrobiology, yet electroautotrophic microorganisms remain poorly explored ...
Quansheng Wang, Maggie C. Y. Lau Vetter
wiley   +1 more source

Investigating Impacts of Amino Acids on the Structural Stability of Anionic Biomembranes

ChemSystemsChem, Volume 7, Issue 2, March 2025.
Glycine and lysine interact with the anionic membrane composed of POPC and POPG (1 : 1). Lysine partitions into the membrane and induces structural alterations, while the membrane remains impermeable to it. In contrast, glycine causes no physicochemical damage and permeates through the membrane.
Arslan Siddique, Lauren A. Lowe, Soumya Kanti De, Daniel W. K. Loo, Anton P. Le Brun, Andrew R. J. Nelson, Anna Wang   +6 more
wiley   +1 more source

Microbially generated ferruginous crusts: A potential biosignature of continental input in coastal settings

Sedimentology, EarlyView.
ABSTRACT Thin ferruginous sandy crusts are common on top of sandstone beds in the Early Permian post‐glacial deposits of the Paraná Basin in southern Brazil. These crusts usually preserve wrinkle structures, suggesting that they might be a product of microbial mediation.
Patrícia Weschenfelder, Renata Guimarães Netto, Alisson Klayton Martins   +2 more
wiley   +1 more source

Light Regimes Shape Utilization of Extracellular Organic C and N in a Cyanobacterial Biofilm

mBio, 2016
Although it is becoming clear that many microbial primary producers can also play a role as organic consumers, we know very little about the metabolic regulation of photoautotroph organic matter consumption.
Rhona K. Stuart, Xavier Mayali, Amy A. Boaro, Adam Zemla, R. Craig Everroad, Daniel Nilson, Peter K. Weber, Mary Lipton, Brad M. Bebout, Jennifer Pett-Ridge, Michael P. Thelen   +10 more
doaj   +1 more source

Emerging Priorities for Microbiome Research

Frontiers in Microbiology, 2020
Microbiome research has increased dramatically in recent years, driven by advances in technology and significant reductions in the cost of analysis. Such research has unlocked a wealth of data, which has yielded tremendous insight into the nature of the ...
Chad M. Cullen, Kawalpreet K. Aneja, Sinem Beyhan, Clara E. Cho, Stephen Woloszynek, Stephen Woloszynek, Matteo Convertino, Sophie J. McCoy, Yanyan Zhang, Matthew Z. Anderson, Matthew Z. Anderson, David Alvarez-Ponce, Ekaterina Smirnova, Lisa Karstens, Lisa Karstens, Pieter C. Dorrestein, Hongzhe Li, Ananya Sen Gupta, Kevin Cheung, Jennifer Gloeckner Powers, Zhengqiao Zhao, Gail L. Rosen, Gail L. Rosen   +22 more
doaj   +1 more source

Investigation of Spaceflight Induced Changes to Astronaut Microbiomes

Frontiers in Microbiology, 2021
The International Space Station (ISS) is a uniquely enclosed environment that has been continuously occupied for the last two decades. Throughout its operation, protecting the health of the astronauts on-board has been a high priority.
Michael D. Morrison, James B. Thissen, Fathi Karouia, Fathi Karouia, Fathi Karouia, Satish Mehta, Camilla Urbaniak, Kasthuri Venkateswaran, David J. Smith, Crystal Jaing   +9 more
doaj   +1 more source

About the presence of arsenic in prebiotic species

BIO Web of Conferences, 2014
The recent publication that some bacteria could use arsenic instead of phosphorus for building their DNA triggered a large controversy in the astro/exobiology community. Most comments claim that such a substitution is not possible.
Ellinger Y., Toulouze M., Pilmé J., Pauzat F.   +3 more
doaj   +1 more source

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

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