Results 121 to 130 of about 4,473,250 (366)

The ¹⁷O/¹⁸O Ratio of Post-AGB Sources: Canonical and Non-Canonical Populations

Galaxies
Stellar evolution models serve as tools to derive stellar parameters from elemental and isotopic abundance ratios. For low-to-intermediate mass evolved stars, C/O, 12C/13C, and 17O/18O ratios are proxies of the initial mass, a largely unknown parameter ...
Javier Alcolea, Elisa Masa, Theo Khouri, Miguel Santander-García, Iván Gallardo Cava, Hans Olofsson, Carmen Sánchez Contreras, Valentín Bujarrabal, Wouter H. T. Vlemmings, Daniel Tafoya   +9 more
doaj   +1 more source

The AMBRE Project: searching for the closest solar siblings

, 2018
Finding solar siblings, that is, stars that formed in the same cluster as the Sun, will yield information about the conditions at the Sun's birthplace.
Adibekyan, V., de Laverny, P., Delgado-Mena, E., Ferreira, A. C. S., Hakobyan, A. A., Kordopatis, G., Recio-Blanco, A., Santos, N. C., Sousa, S. G., Tsantaki, M.   +9 more
core   +1 more source

Protein pyrophosphorylation by inositol pyrophosphates — detection, function, and regulation

FEBS Letters, EarlyView.
Protein pyrophosphorylation is an unusual signaling mechanism that was discovered two decades ago. It can be driven by inositol pyrophosphate messengers and influences various cellular processes. Herein, we summarize the research progress and challenges of this field, covering pathways found to be regulated by this posttranslational modification as ...
Sarah Lampe, Tanmay Kumar Mohanty, Rashna Bhandari, Dorothea Fiedler   +3 more
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

The challenge of simultaneously matching the observed diversity of chemical abundance patterns in cosmological hydrodynamical simulations [PDF]

, 2021
Tobias Buck, J. Rybizki, Sven Buder, Aura Obreja, Andrea V. Macciò, Christoph Pfrommer, Matthias Steinmetz, Melissa Ness   +7 more
openalex   +1 more source

CHEMICAL ABUNDANCES IN A SAMPLE OF RED GIANTS IN THE OPEN CLUSTER NGC 2420 FROM APOGEE [PDF]

, 2016
NGC 2420 is a ∼2 Gyr old well-populated open cluster that lies about 2 kpc beyond the solar circle, in the general direction of the Galactic anti-center.
D. Souto, K. Cunha, V. Smith, C. Prieto, M. Pinsonneault, O. Zamora, D. A. Garc'ia-Hern'andez, S. Mészáros, J. Bovy, A. Pérez, F. Anders, D. Bizyaev, R. Carrera, P. Frinchaboy, J. Holtzman, I. Ivans, S. Majewski, M. Shetrone, J. Sobeck, K. Pan, B. Tang, S. Villanova, D. Geisler   +22 more
semanticscholar   +1 more source

The role of histone modifications in transcription regulation upon DNA damage

FEBS Letters, EarlyView.
This review discusses the critical role of histone modifications in regulating gene expression during the DNA damage response (DDR). By modulating chromatin structure and recruiting repair factors, these post‐translational modifications fine‐tune transcriptional programmes to maintain genomic stability.
Angelina Job Kolady, Siyao Wang
wiley   +1 more source

Excitation and abundance study of CO+ in the interstellar medium

, 2009
Observations of CO+ suggest column densities on the order 10^12 cm^-2 that can not be reproduced by many chemical models. CO+ is more likely to be destroyed than excited in collisions with hydrogen.
Andersson, Black, Cheng, Dickinson, Dubernet, Faure, Ferland, Flower, Fuente, Fuente, Fuente, Fuente, Hogerheijde, Jansen, Latter, Meixner, P. Stäuber, Park, Pellegrini, Pickett, Rizzo, Röllig, S. Bruderer, Savage, Schöier, Spaans, Sternberg, Stoerzer, Stäuber, Stäuber, Stäuber, Stäuber, Troe, van der Tak, Woodall   +34 more
core   +2 more sources

Differential abundances of open clusters and their tidal tails: Chemical tagging and chemical homogeneity [PDF]

, 2020
L. Casamiquela, Y. Tarricq, C. Soubiran, S. Blanco-Cuaresma, P. Jofré, U. Heiter, M. Tucci Maia   +6 more
openalex   +1 more source

Atomic Diffusion and Mixing in Old Stars VIII: Chemical abundance variations in the globular cluster M4 (NGC 6121) [PDF]

, 2023
Thomas Nordlander, Pieter Gruyters, O. Richard, A. J. Korn   +3 more
openalex   +1 more source