Results 11 to 20 of about 531 (218)

New single-valued-parameters radiative accelerations of Sc and Ni for modelling stellar interiors

Astronomy & Astrophysics
Context. The precise evaluation of the radiative accelerations of chemical elements in stars is critical since these accelerations are often the principal contributor to atomic diffusion. Atomic diffusion causes the migration of elements inside stars and
Alecian G., LeBlanc F., Hui-Bon-Hoa A.
doaj   +1 more source

Zeeman Doppler Mapping: On the Spuriousness and Nonuniqueness of Magnetic Maps

The Astrophysical Journal
Magnetic and abundance maps of chemically peculiar (CP) stars, derived with the help of Zeeman Doppler mapping (ZDM), have always been and still are used as arguments against atomic diffusion theory, even though it has been shown that the quasi-totality ...
Martin J. Stift, Francesco Leone
doaj   +1 more source

Diffusional Separation of Calcium Isotopes in Chemically Peculiar Stellar Atmospheres

Open Astronomy, 2014
Diffusional separation of calcium isotopes in the atmospheres of hot chemically peculiar stars is studied. In addition to the usual radiative acceleration effect, the light-induced drift is taken into account.
Sapar L., Sapar A., Poolamäe R., Aret A.   +3 more
doaj   +1 more source

The Barium Odd Isotope Fractions in Seven Ba Stars

Universe, 2022
Based on the spectra with high resolution and a high signal-to-noise ratio, we investigate the enrichment history of the s-process element in seven barium (Ba) stars by measuring their Ba odd isotope fraction.
Fang Wen, Wenyuan Cui, Miao Tian, Xiaoxiao Zhang, Jianrong Shi, Bo Zhang   +5 more
doaj   +1 more source

Residual tail twisting in ascidian larvae is stabilized by asymmetric myofibrils that resist bilateral symmetry restoration

FEBS Letters, EarlyView.
Ascidian Ciona larvae initially show strong clockwise tail twisting, which is largely corrected during development. However, a small residual twist remains. This study shows that organized helical myofibrils in tail muscles mechanically stabilize this residual asymmetry, preventing complete restoration of bilateral symmetry and revealing how embryos ...
Yuki S. Kogure, Misaki K. Nishio, Satoru Okuda, Kohji Hotta   +3 more
wiley   +1 more source

Some features of roAp stars spectrum

Odessa Astronomical Publications, 2017
We have shown the possibility for modelling Li blend6708 A, for two roAp stars, HD83368 and HD60435, taking into account lithium spots on the surfaces of these rotating stars. REE spots were also included in calculations.
A. V. Shavrina, N. S. Polosukhina, V. V. Tsymbal, Ya. V. Pavlenko, A. V. Yushchenko, V. F. Gopka, A. A. Veles   +6 more
doaj   +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

Salmonella lipopolysaccharide‐containing supported lipid bilayers as platforms to study bacteriophage interactions

FEBS Letters, EarlyView.
We present robust protocols for the preparation of supported lipid bilayers (SLBs) incorporating either Salmonella smooth LPS or outer membrane vesicles (OMVs). We use a combination of quartz crystal microbalance with dissipation (QCM‐D) and fluorescence microscopy to both characterize the SLBs of various compositions and to probe their interactions ...
Hudson P. Pace, Alyssa Borges, Charles Arnaud, Tove Karlsson, Nina K. Bröker, Stefanie Barbirz, Marta Bally   +6 more
wiley   +1 more source

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

Deep Learning-based Identification of CP1 and CP2 Stars from LAMOST DR11

The Astronomical Journal
Chemically peculiar (CP) stars, particularly CP1 (metallic-line) and CP2 (magnetic Ap/Bp) stars, are crucial for studying microscopic processes in stellar atmospheres, such as atomic diffusion and magnetic interactions. In this study, we present ODCNNnet,
ZhiWei Lu, Xiaoming Kong, YaTao Zhang, ZhenPing Yi, Meng Liu   +4 more
doaj   +1 more source