Results 111 to 120 of about 59,850 (232)
1000–10,000 M⊙ Primordial Stars Created the Nitrogen Excess in GS 3073 at z = 5.55
The Astrophysical Journal LettersThe advent of the James Webb Space Telescope has revealed a wealth of new galaxies just a few hundred Myr after the Big Bang, a few of which exhibit unusual N/O ratios that are difficult to explain with stellar populations today.
Devesh Nandal +3 more
doaj +1 more source
Chemical evolution models of Local Group galaxies [PDF]
, 2006 12 pages, 7 figures (last fig compressed). Review paper presented at the STScI May Symposium 'The Local Group as an Astrophysical Laboratory', Cambridge Univ.Press, in ...
openaire +2 more sources
Terrestrial Analogs to Titan for Geophysical Research
Reviews of Geophysics, Volume 64, Issue 2, June 2026.Abstract Saturn's moon Titan exhibits remarkable parallels to the Earth in many geophysical and geological processes not found elsewhere in the solar system at the present day. These include a nitrogen atmosphere with a condensible gas—methane—replacing the Earth's water, leading to an active meteorology with rainfall and surface manifestations ...
Conor A. Nixon +21 more
wiley +1 more source
Controlling 3D Contractility via Engineered Fibrous Hydrogel Composites
Advanced Functional Materials, Volume 36, Issue 36, 4 May 2026.A tunable composite contractile assembly (CCA) is developed that can permit or resist contraction without changing cell‐adhesion and density, unlike collagen whose inherent coupling of these ECM cues limits its use as a platform in contractility studies.
Karen L. Xu +7 more
wiley +1 more source
Early Chemical Evolution of Galaxies
, 1999 Initial conditions are set by Big bang nucleosynthesis from which we know that 90 per cent of baryons are dark and have essentially unknown chemical composition. In our own Galaxy, there are many clues from individual stars in different populations whereas in elliptical galaxies the data largely come from integrated spectra, but these raise problems ...
openaire +2 more sources
The Curious Case of CysE: Diversity and Distribution of Serine Acetyltransferases in Bacteria
Proteins: Structure, Function, and Bioinformatics, Volume 94, Issue 5, Page 1092-1103, May 2026.ABSTRACT Serine acetyltransferase (CysE) is a member of the left‐handed β‐helix family of acetyltransferases that catalyze the rate limiting step in de novo cysteine biosynthesis. There are two isoforms of CysE that differ in length, with the shorter isoform lacking approximately 76 amino acids at the N‐terminus of the protein from the serine ...
Keely E. A. Oldham +3 more
wiley +1 more source
The Astrophysical JournalThe observed chemical diversity of Milky Way stars places important constraints on Galactic chemical evolution and the mixing processes that operate within the interstellar medium. Recent works have found that the chemical diversity of disk stars is low.
Catherine Manea +5 more
doaj +1 more source
Constraining the Hydration of Clay Minerals and Abundances of Amorphous Phases in Gale Crater, Mars
Journal of Geophysical Research: Planets, Volume 131, Issue 5, May 2026.Abstract Both water and organic matter are required for the development and persistence of life. Phyllosilicates (clay minerals) have high surface areas that easily sorb water and organic matter. The Curiosity rover has investigated several hundred meters of stratigraphy in Gale crater, including where clays were detected from orbit.
Sean Czarnecki +3 more
wiley +1 more source
GOES‐R Series X‐Ray Sensor (XRS): 2. On‐Orbit Measurements and Calibrations
Journal of Geophysical Research: Space Physics, Volume 131, Issue 5, May 2026.Abstract An X‐Ray Sensor (XRS) has been onboard each of the National Oceanic and Atmospheric Administration (NOAA) Geostationary Operational Environmental Satellites (GOES) since 1975. XRS measures full‐disk soft X‐ray irradiance in two wavelength bands, 0.05–0.4 nm and 0.1–0.8 nm.
Janet L. Machol +17 more
wiley +1 more source
The Astrophysical JournalUsing more than 100 galaxies in the MUSE Ultra Deep Field with spectroscopy from the Hubble Space Telescope’s (HST) Wide Field Camera 3 and the Very Large Telescope’s Multi Unit Spectroscopic Explorer, we extend the gas-phase mass–metallicity relation ...
Mitchell Revalski +15 more
doaj +1 more source