Results 91 to 100 of about 4,406,721 (399)

Chemical Abundances of M-Dwarfs from the Apogee Survey. I. The Exoplanet Hosting Stars Kepler-138 and Kepler-186 [PDF]

, 2016
We report the first detailed chemical abundance analysis of the exoplanet-hosting M-dwarf stars Kepler-138 and Kepler-186 from the analysis of high-resolution (R ∼ 22,500) H-band spectra from the SDSS-IV–APOGEE survey.
D. Souto, Katia Cunha, D. A. García-Hernández, O. Zamora, C. Prieto, Verne V. Smith, S. Mahadevan, Cullen H. Blake, J. Johnson, H. Jőnsson, M. Pinsonneault, Jon A. Holtzman, S. Majewski, M. Shetrone, J. Teske, D. Nidever, R. Schiavon, J. Sobeck, A. Pérez, Y. G. M. Chew, K. Stassun   +20 more
semanticscholar   +1 more source

Chemical abundances of the Typhon stellar stream

Monthly Notices of the Royal Astronomical Society, 2022
ABSTRACT We present the first high-resolution chemical abundances of seven stars in the recently discovered high-energy stream Typhon. Typhon stars have apocentres r ≳ 100 kpc, making this the first detailed chemical picture of the Milky Way’s very distant stellar halo.
Alexander P Ji, Rohan P Naidu, Kaley Brauer, Yuan-Sen Ting, Joshua D Simon   +4 more
openaire   +2 more sources

Taurine promotes glucagon‐like peptide‐1 secretion in enteroendocrine L cells

FEBS Letters, EarlyView.
Taurine, a sulfur‐containing amino acid, is likely taken up by enteroendocrine L cells via the taurine transporter. This process increases the levels of cytosolic ATP. The increase in intracellular Ca2+ concentrations and glucagon‐like peptide‐1 secretion through membrane depolarization is caused by the closure of ATP‐sensitive potassium channels ...
Yuri Osuga, Kazuki Harada, Takuya Yamauchi, Tetsuya Kitaguchi, Masami Yokota Hirai, Mitsuharu Matsumoto, Takashi Tsuboi   +6 more
wiley   +1 more source

Planetary nebulae in the inner Milky Way: new abundances [PDF]

, 2009
The study of planetary nebulae in the inner-disk and bulge gives important information on the chemical abundances of elements such as He, N, O, Ar, Ne, and on the evolution of these abundances, which is associated with the evolution of intermediate-mass ...
Cavichia, O., Costa, R. D. D., Maciel, W. J.   +2 more
core   +2 more sources

YOUNG STARS AND IONIZED NEBULAE IN M83: COMPARING CHEMICAL ABUNDANCES AT HIGH METALLICITY [PDF]

, 2016
We present spectra of 14 A-type supergiants in the metal-rich spiral galaxy M83. We derive stellar parameters and metallicities and measure a spectroscopic distance modulus (4.9 ± 0.2 Mpc), in agreement with other methods.
F. Bresolin, R. Kudritzki, M. Urbaneja, W. Gieren, I. Ho, G. Pietrzyński   +5 more
semanticscholar   +1 more source

The multiple roles of the NlpC_P60 peptidase family in mycobacteria – an underexplored target for antimicrobial drug discovery

FEBS Letters, EarlyView.
The NlpC_P60 superfamily of peptidases is recognised by its key role in bacterial cell wall homeostasis. Recently, studies have also described the involvement of NlpC_P60‐like enzymes in bacterial competitive mechanisms and pathogenesis across several lineages.
Catharina dos Santos Silva, Marcio Vinicius Bertacine Dias   +1 more
wiley   +1 more source

Two groups of red giants with distinct chemical abundances in the bulge globular cluster NGC 6553 through the eyes of APOGEE [PDF]

, 2016
Multiple populations revealed in globular clusters (GCs) are important windows to the formation and evolution of these stellar systems. The metal-rich GCs in the Galactic bulge are an indispensable part of this picture, but the high optical extinction in
B. Tang, R. Cohen, D. Geisler, R. Schiavon, S. Majewski, S. Villanova, R. Carrera, O. Zamora, D. A. García-Hernández, M. Shetrone, P. Frinchaboy, A. Meza, J. G. Fernández-Trincado, R. Muñoz, Chien-Cheng Lin, R. Lane, C. Nitschelm, K. Pan, D. Bizyaev, D. Bizyaev, D. Oravetz, A. Simmons   +21 more
semanticscholar   +1 more source

Chemical abundances in Seyfert galaxies – IX. Helium abundance estimates

Monthly Notices of the Royal Astronomical Society, 2022
ABSTRACT For the first time, the helium abundance relative to hydrogen (He/H), which relied on direct measurements of the electron temperature, has been derived in the narrow line regions (NLRs) from a local sample of Seyfert 2 nuclei.
O L Dors, M Valerdi, P Freitas-Lemes, A C Krabbe, R A Riffel, E B Amôres, R Riffel, M Armah, A F Monteiro, C B Oliveira   +9 more
openaire   +2 more sources

Making tau amyloid models in vitro: a crucial and underestimated challenge

FEBS Letters, EarlyView.
This review highlights the challenges of producing in vitro amyloid assemblies of the tau protein. We review how accurately the existing protocols mimic tau deposits found in the brain of patients affected with tauopathies. We discuss the important properties that should be considered when forming amyloids and the benchmarks that should be used to ...
Julien Broc, Clara Piersson, Yann Fichou
wiley   +1 more source

Optical Spectroscopy and Photoionization Model of Planetary Nebula NGC 6572

Journal of Mathematical and Fundamental Sciences
We investigated NGC 6572 through optical spectroscopy to determine its kinematical and chemical properties. Two intermediate dispersion spectra (R~5000) centered around Hα and Hβ were used to derive the nebular expansion velocity from emission lines ...
Muhammad Fajrin, Hakim Luthfi Malasan, Evan Irawan Akbar   +2 more
doaj   +1 more source