Results 41 to 50 of about 1,884 (262)

Solar and stellar abundances of the elements [PDF]

Physics and Chemistry of the Earth, 1961
Peer Reviewed ; http://deepblue.lib.umich.edu/bitstream/2027.42/32385/1/0000460 ...
openaire   +2 more sources

Gut microbiome and aging—A dynamic interplay of microbes, metabolites, and the immune system

FEBS Letters, EarlyView.
Age‐dependent shifts in microbial communities engender shifts in microbial metabolite profiles. These in turn drive shifts in barrier surface permeability of the gut and brain and induce immune activation. When paired with preexisting age‐related chronic inflammation this increases the risk of neuroinflammation and neurodegenerative diseases.
Aaron Mehl, Eran Blacher
wiley   +1 more source

The human gut microbiome across the life course

FEBS Letters, EarlyView.
Despite significant individual variation and continuous change throughout life, the human gut microbiome follows some life stage‐specific trends. This article provides a brief overview of how gut microbiome composition shifts across different phases of life. Created in BioRender. Özkurt, E. (2026) https://BioRender.com/8q4nrnc.
Alise J. Ponsero, Basak Bahcivanci, Antonietta Hayhoe, Animesh Acharjee, Ezgi Özkurt   +4 more
wiley   +1 more source

Barium Abundances from the LAMOST Medium-Resolution Survey Stellar Spectra

The Astrophysical Journal Supplement Series
Based on a template-matching method, we estimate the barium (Ba) abundances for stellar spectra from the Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST) Medium-Resolution Spectroscopic Survey (MRS).
Tian-Yi Chen, Jian-Rong Shi, Hong-Liang Yan, Timothy C. Beers, Chun-Qian Li, Ming-Yi Ding, Xiao-Jin Xie, Liu Shuai, Zeming Zhou, Yao-Jia Tang   +9 more
doaj   +1 more source

Cosmic abundances: The impact of stellar duplicity

, 2004
The mass-transfer scenario links chemical peculiarities with stellar duplicity for an increasing number of stellar classes (classical and dwarf barium stars, subgiant and giant CH stars, S stars without technetium, yellow symbiotic stars, WIRRING stars, Abell-35-like nuclei of planetary nebulae...).
Jorissen, Alain, Van Eck, Sophie
openaire   +3 more sources

A COMPARISON OF STELLAR ELEMENTAL ABUNDANCE TECHNIQUES AND MEASUREMENTS [PDF]

The Astrophysical Journal Supplement Series, 2016
ABSTRACT Stellar elemental abundances are important for understanding the fundamental properties of a star or stellar group, such as age and evolutionary history, as well as the composition of an orbiting planet. However, as abundance measurement techniques have progressed, there has been little standardization between individual methods
Natalie R. Hinkel, Patrick A. Young, Michael D. Pagano, Steven J. Desch, Ariel D. Anbar, Vardan Adibekyan, Sergi Blanco-Cuaresma, Joleen K. Carlberg, Elisa Delgado Mena, Fan Liu, Thomas Nordlander, Sergio G. Sousa, Andreas Korn, Pieter Gruyters, Ulrike Heiter, Paula Jofré, Nuno C. Santos, Caroline Soubiran   +17 more
openaire   +4 more sources

An unexpected alternative viologen electron mediator site in tungsten‐containing formate dehydrogenase

FEBS Letters, EarlyView.
An unexpected alternative interaction site for ethyl viologen was identified in formate dehydrogenase 1 from Methylorubrum extorquens. Combined mutagenesis, kinetic analysis, and docking revealed that aromatic residues near an iron–sulfur cluster enable flavin mononucleotide‐independent electron transfer, offering a framework for engineering improved ...
Eleni G. Poloniataki, Yong Hwan Kim
wiley   +1 more source

Determining Stellar Elemental Abundances from DESI Spectra with the Data-driven Payne

The Astrophysical Journal Supplement Series
Stellar abundances for a large number of stars provide key information for the study of Galactic formation history. Large spectroscopic surveys such as the Dark Energy Spectroscopic Instrument (DESI) and LAMOST take median-to-low-resolution ( R ≲ 5000 ...
Meng Zhang, Maosheng Xiang, Yuan-Sen Ting, Jiahui Wang, Haining Li, Hu Zou, Jundan Nie, Lanya Mou, Tianmin Wu, Yaqian Wu, Jifeng Liu   +10 more
doaj   +1 more source

Stellar abundances tracing the formation of the Galactic Bulge [PDF]

Proceedings of the International Astronomical Union, 2008
AbstractThe metallicity distribution and abundance ratios of the Galactic bulge are reviewed. Issues raised by different groups in recent work, in particular the high metallicity end, a comparison between the oxygen abundances derived from different indicators, the [OI] 630nm and IR OH lines, and the issue of measuring giants vs. dwarfs, are discussed.
Barbuy, Beatriz, Zoccali, Manuela, Ortolani, Sergio, Hill, Vanessa, Renzini, Alvio, Meléndez, Jorge, Gómez, Anita, Asplund, Martin, Minniti, Dante, Bica, Eduardo, Alves-Brito, Alan   +10 more
openaire   +3 more sources

Microbiome−host proteostasis crosstalk—An emerging perspective on mechanisms and interventions toward healthy longevity

FEBS Letters, EarlyView.
Proteostasis and the gut microbiota play a key role in shaping host physiology. Microbiota‐derived metabolites, vitamins, and RNA modulate host proteostasis. Findings from model systems, including C. elegans, indicate microbes can either stabilize or disrupt host proteostasis.
Abhishek Anil Dubey, Maria Ermolaeva
wiley   +1 more source