Results 21 to 30 of about 531 (218)

Search for magnetic fields in seven slowly rotating A stars

Astronomy & Astrophysics
Context. A small fraction of A-type stars host strong fossil magnetic fields. Identifying them among the broader A-type population relies on indirect indicators such as chemical peculiarities, slow rotation, and rotational modulation, which are also ...
de Frutos-Rull P., Neiner C., Labadie-Bartz J., Royer F., Monier R., Thomson-Paressant K.   +5 more
doaj   +1 more source

An Ap Star Catalog Based on LAMOST DR9

The Astrophysical Journal, 2023
We present a sample of 2700 Ap stars in the Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST) DR9 catalog. The candidates are first selected to be in a temperature range typical of Ap stars by using the BP − RP color index from Gaia DR3.
Fangfei Shi, Huawei Zhang, Jianning Fu, Donald Kurtz, Maosheng Xiang   +4 more
doaj   +1 more source

From mice to humans—divergent strategies for intestinal homeostasis and regeneration

FEBS Letters, EarlyView.
Recent advances such as organoid genome editing, xenotransplantation, imaging, and whole‐genome sequencing have enabled direct studies of human intestinal stem cells (ISCs). These studies reveal species‐specific features, including slower ISC proliferation, distinct injury responses, slower somatic mutation accumulation in humans, and an inverse ...
Keiko Ishikawa, Shinya Sugimoto, Toshiro Sato   +2 more
wiley   +1 more source

Mining the GALAH Data. I. Study of Five Super Lithium-rich Metal-poor Giants

The Astrophysical Journal
The presence of a large amount of Li in giants is still a mystery. Most of the super Li-rich (SLR) giants reported in recent studies are in the solar metallicity regime.
Antony Susmitha, Anohita Mallick, Bacham E. Reddy   +2 more
doaj   +1 more source

Tracing ωCentauri’s origins: Spatial and chemical signatures of its formation history

Astronomy & Astrophysics
ωCentauri (ωCen), with its unmatched chemical complexity, is the most enigmatic Galactic globular cluster (GC). We combine photometric and spectroscopic catalogs to identify distinct stellar populations within ωCen, investigate their spatial distribution
Dondoglio E., Milone A. P., Marino A. F., Mastrobuono-Battisti A., Bortolan E., Legnardi M. V., Ziliotto T., Muratore F., Cordoni G., Lagioia E. P., Tailo M.   +10 more
doaj   +1 more source

Design and analysis strategies for robust microbiome ageing research

FEBS Letters, EarlyView.
The gut microbiome changes with age and associates with age‐related morbidity and mortality, establishing it as a potential biomarker and intervention target for ageing. Realising this potential requires methodological rigour, yet distinguishing biological signals from methodological artefacts remains challenging across cohorts. This review provides an
Mark Olenik, İsmail Güderer, Yi Wang, Tayyaba Alvi, Prasoon Pandey, Handan Melike Dönertaş   +5 more
wiley   +1 more source

Reconstructing enzyme evolution by protein engineering

FEBS Letters, EarlyView.
Natural enzyme evolution can be retraced by protein engineering methods such as directed evolution, rational design, and ancestral sequence reconstruction. These approaches reveal how enzymes emerged from ligand‐binding scaffolds, developed varying substrate preferences, formed oligomeric complexes, adapted to environmental changes, and evolved novel ...
Lukas Drexler, Markus R. Busch, Reinhard Sterner   +2 more
wiley   +1 more source

A Sample of Am and Ap Candidates from LAMOST DR10 (v1.0) Based on the Ensemble Regression Model

The Astrophysical Journal Supplement Series
Large samples of Am and Ap stars are helpful in studying the interplay between phenomena like atomic diffusion, magnetic fields, and stellar rotation in stellar astrophysics.
Hai-Feng Yang, Rui Wang, Jiang-Hui Cai, A-Li Luo, Bing Du, Yan-Ting He, Mei-Hong Su, Chen-Hui Shi, Xu-Jun Zhao, Ya-Ling Xun, Yi-Nan Yuan   +10 more
doaj   +1 more source

Conserved binding mode but diverse interfaces of MreC‐PBP2 interactions

FEBS Letters, EarlyView.
The crystal structure of abMreC reveals a conserved two β‐barrel architecture and provides structural insights into its role within the bacterial elongasome. The abMreC–abPBP2 complex model identifies the molecular basis of MreC‐mediated PBP2 recognition, contributing to the regulation of peptidoglycan synthesis.
Hyunseok Jang, Hyo Been Jin, Chang Min Kim, So Yeon Lee, Hyun Ho Park   +4 more
wiley   +1 more source

Microbiome‐blood–brain barrier interactions in aging — mechanisms and therapeutic potential

FEBS Letters, EarlyView.
Aging reshapes the gut microbiome (↓SCFA‐producing commensals; ↑pro‐inflammatory outputs), shifting circulating metabolites (↓SCFAs; ↑LPS, ↑TMAO, ↑PAA) that act at the BBB to increase nonspecific transcytosis, alter transport, and promote astrocyte reactivity, heightening brain vulnerability.
Daniel Cuervo‐Zanatta, Hari Baskar Balasubramanian, Amir Pasokh, Marietta Zille   +3 more
wiley   +1 more source