Results 101 to 110 of about 215,434 (305)
Observations of the Halo Star HD 177566
The Astrophysical JournalWe have analyzed archival far-ultraviolet (FUV) and optical spectra of the hot halo star HD 177566. The star has an effective temperature T _eff = 33,000 ± 1000 K, surface gravity $\mathrm{log}g=3.79\pm 0.11$ , and helium abundance $\mathrm{log}N({\rm{He}
William V. Dixon, Pierre Chayer
doaj +1 more source
Symmetric Atom–Atom and Ion–Atom Processes in Stellar Atmospheres
Atoms, 2017 We present the results of the influence of two groups of collisional processes (atom–atom and ion–atom) on the optical and kinetic properties of weakly ionized stellar atmospheres layers.
Vladimir A. Srećković +2 more
doaj +1 more source
Pressure in Stellar Atmospheres [PDF]
Nature, 1911 WITHIN the last fifteen years the spectroscopic equipment applied to the study of both laboratory and celestial investigation has been very materially modified both in dispersive power and design. In the early nineties there were very few of the 21.5-feet Rowland concave grating spectrographs in regular commission for terrestrial research, and it is ...
openaire +1 more source
Effect of terahertz irradiation on DNA damage repair in living cells
FEBS Open Bio, EarlyView.We investigated the effect of terahertz (THz) wave irradiation on DNA double‐strand break (DSB) repair in living cells. We found that THz irradiation enhanced DSB repair at specific frequencies, whereas heat treatment inhibited it, indicating that this effect is nonthermal and frequency‐specific.
Yuya Ueno +3 more
wiley +1 more source
Astronomy & AstrophysicsContext. Transmission spectroscopy has enabled the analysis of exoplanet atmospheres. However, a major challenge in this field is the “noise” from host stars, caused by stellar activity such as dark spots and bright plages.
Lucero Jennifer P. +4 more
doaj +1 more source
Resolving Stellar Atmospheres 1. Hα line and comparisons to microlensing observations
, 2006 Context. We present work on Hα spectral line characteristics in PHOENIX stellar model atmospheres and their comparison to microlensing observations. Aims.
Thurl, Christine +5 more
core +1 more source
Importin 7 mediates the nuclear import of HIV‐1 integrase via a specific interacting interface
FEBS Open Bio, EarlyView.HIV‐1 integrase enables viral DNA integration into the host genome. By binding to the core domain of the host protein Importin 7 via its C‐terminal domain, the integrase is transported across the nuclear membrane into the nucleus, where integration of the viral genome into host DNA takes place. This translocation is a critical step for subsequent viral
Juana Bana +5 more
wiley +1 more source
The Influence of Stellar Chromospheres and Coronae on Exoplanet Transmission Spectroscopy
The Astrophysical Journal LettersA main source of bias in transmission spectroscopy of exoplanet atmospheres is magnetic activity of the host star in the form of stellar spots, faculae, or flares. However, the fact that main-sequence stars have a chromosphere and a corona and that these
Volker Perdelwitz +3 more
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FEBS Open Bio, EarlyView.NMR metabolomics revealed concentration‐dependent metabolic perturbations in HepG2 cells exposed to H2O2. Rifampicin pretreatment enhanced metabolic competence, attenuated toxin‐induced alterations and produced metabolite profiles more consistent with human liver physiology, supporting the use of CYP450‐induced HepG2 models for improved in vitro ...
Maren Jinks +4 more
wiley +1 more source
Indicators of Mass in Spherical Stellar Atmospheres
, 2013 Mass is the most important stellar parameter, but it is not directly observable for a single star. Spherical model stellar atmospheres are explicitly characterized by their luminosity (L*), mass (M*), and radius (R*), and observations can now determine ...
Neilson, Hilding R. +2 more
core +1 more source