Results 61 to 70 of about 4,382,200 (272)

CHEMICAL ABUNDANCES IN BINARIES WITH TWIN COMPONENTS

Odessa Astronomical Publications, 2017
Procedure and some preliminary results of abundances determination in binaries with twin components from solar neighborhood are discussed. Numerical analysis were carried out by fits of synthetical spectra and COG to high resolution (R=50000) observed ...
Yu. Lyubchik, E. Martin, G. Basri, Ya. Pavlenko   +3 more
doaj   +1 more source

Screening Earth Analog Exoplanets on the Basis of a Predicted Nitrogen over Phosphorus Ratio

The Astrophysical Journal, 2023
Since the first discovery in 1995, data for over 5300 exoplanets have been documented in the NASA archive, revealing a vast diversity. Identifying life-enabling analogs of the Earth among this rapidly expanding catalog is of major interest. The stability
Hervé Toulhoat
doaj   +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

Non-LTE abundances of Mg and K in extremely metal-poor stars and the evolution of [O/Mg], [Na/Mg], [Al/Mg] and [K/Mg] in the Milky Way [PDF]

, 2010
LTE abundances of light elements in extremely metal-poor (EMP) stars have been previously derived from high quality spectra. New derivations, free from the NLTE effects, will better constrain the models of the Galactic chemical evolution and the yields ...
Andrievsky, S. M., Bonifacio, P., Cayrel, R., François, P., Hill, V., Korotin, S. A., Spite, F., Spite, Monique   +7 more
core   +5 more sources

The RAVE-on Catalog of Stellar Atmospheric Parameters and Chemical Abundances for Chemo-dynamic Studies in the Gaia Era [PDF]

, 2016
The orbits, atmospheric parameters, chemical abundances, and ages of individual stars in the Milky Way provide the most comprehensive illustration of galaxy formation available.
A. Casey, K. Hawkins, D. Hogg, M. Ness, Hans Walter-Rix, G. Kordopatis, A. Kunder, M. Steinmetz, Sergey E. Koposov, H. Enke, J. Sanders, G. Gilmore, T. Zwitter, K. Freeman, L. Casagrande, G. Matijevivc, G. Seabroke, O. Bienaym'e, J. Bland-Hawthorn, B. Gibson, E. Grebel, A. Helmi, U. Munari, J. Navarro, W. Reid, A. Siebert, R. Wyse   +26 more
semanticscholar   +1 more source

Plasmodium falciparum gametogenesis essential protein 1 (GEP1) is a transmission‐blocking target

FEBS Letters, EarlyView.
This study shows Plasmodium falciparum GEP1 is vital for activating sexual stages of malarial parasites even independently of a mosquito factor. Knockout parasites completely fail gamete formation even when a phosphodiesterase inhibitor is added. Two single‐nucleotide polymorphisms (V241L and S263P) are found in 12%–20% of field samples.
Frederik Huppertz, Milagros Siebeck Caturelli, Lina S. Lehmann, Florian Kurth, Alexander G. Maier, Kai Matuschewski   +5 more
wiley   +1 more source

Biophysical analysis of angiotensin II and amyloid‐β cross‐interaction in aggregation and membrane disruption

FEBS Letters, EarlyView.
Angiotensin II (AngII), a neuropeptide, interacts with amyloid‐β (Aβ), a key player in Alzheimer's disease. This study reveals that AngII reduces Aβ aggregation and membrane disruption in vitro. Biophysical assays and molecular modeling suggest AngII binds disordered Aβ forms, potentially modulating early amyloidogenic events and contributing to ...
Mohsen Habibnia, Eric Catalina‐Hernandez, Maialen Cabrerizo‐Idiazabal, Ramon Barnadas‐Rodríguez, Mario Lopez‐Martin, Alex Peralvarez‐Marin   +5 more
wiley   +1 more source

Generalized Te([O iii])–Te(He i) Discrepancies in Ionized Nebulae: Possible Evidence of Case B Deviations and Temperature Inhomogeneities

The Astrophysical Journal
The physics of recombination lines in the He i singlet system is expected to be relatively simple, supported by accurate atomic models. We examine the intensities of He i singlets λ 3614,  λ 3965,  λ 5016,  λ 6678, and  λ 7281 and the triplet He i λ 5876
J. E. Méndez-Delgado, E. D. Skillman, E. Aver, C. Morisset, C. Esteban, J. García-Rojas, K. Kreckel, N. S. J. Rogers, F. F. Rosales-Ortega, K. Z. Arellano-Córdova, S. R. Flury, E. Reyes-Rodríguez, M. Orte-García, S. Tan   +13 more
doaj   +1 more source

The connection between the Galactic halo and ancient Dwarf Satellites

, 2017
We explore the hypothesis that the classical and ultra-faint dwarf spheroidal satellites of the Milky Way have been the building blocks of the Galactic halo by comparing their [O/Fe] and [Ba/Fe] versus [Fe/H] patterns with the ones observed in Galactic ...
Matteucci, F., Romano, D., Spitoni, E., Vincenzo, F.   +3 more
core   +1 more source

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, 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