Results 41 to 50 of about 307,688 (344)

The chemical composition of carbon stars. The R-type stars [PDF]

Astronomy & Astrophysics, 2009
The aim of this work is to shed some light on the problem of the formation of carbon stars of R-type from a detailed study of their chemical composition. We use high-resolution and high signal-to-noise optical spectra of 23 R-type stars selected from the Hipparcos catalogue. The chemical analysis is made using spectral synthesis in LTE and state-of-the-
Zamora, Olga, Abia, Carlos, Plez, Bertrand, Dominguez, Inmaculada, Cristallo, Sergio   +4 more
openaire   +2 more sources

Mapping the evolution of mitochondrial complex I through structural variation

FEBS Letters, EarlyView.
Respiratory complex I (CI) is crucial for bioenergetic metabolism in many prokaryotes and eukaryotes. It is composed of a conserved set of core subunits and additional accessory subunits that vary depending on the organism. Here, we categorize CI subunits from available structures to map the evolution of CI across eukaryotes. Respiratory complex I (CI)
Dong‐Woo Shin, Tingting Chen, James A. Letts   +2 more
wiley   +1 more source

Probing the possibility of hotspots on the central neutron star in HESS J1731-347

, 2017
The X-ray spectra of the neutron stars located in the centers of supernova remnants Cas A and HESS J1731-347 are well fit with carbon atmosphere models. These fits yield plausible neutron star sizes for the known or estimated distances to these supernova
Klochkov, D., Poutanen, J., Suleimanov, V. F., Werner, K.   +3 more
core   +1 more source

Carbon star luminosity indicators

The Astrophysical Journal, 1992
Results are presented of a proper motion survey of known faint high-latitude C stars using plates spanning a 30-yr baseline that reveals at least one additional new dwarf C star and also confirms the utility of the proposed luminosity indicators. Kinematic simulations suggest that to a limit of V of about 18, at least 10 percent of faint high-latitude ...
Paul J. Green, Bruce Margon, Scott F. Anderson, D. J. MacConnell   +3 more
openaire   +1 more source

Binarity in carbon-enhanced metal-poor stars★ [PDF]

Monthly Notices of the Royal Astronomical Society, 2014
13 pages, 7 figures, accepted for publication in ...
Starkenburg, Else, Shetrone, Matthew D., McConnachie, Alan W., Venn, Kim A.   +3 more
openaire   +3 more sources

Spatiotemporal and quantitative analyses of phosphoinositides – fluorescent probe—and mass spectrometry‐based approaches

FEBS Letters, EarlyView.
Fluorescent probes allow dynamic visualization of phosphoinositides in living cells (left), whereas mass spectrometry provides high‐sensitivity, isomer‐resolved quantitation (right). Their synergistic use captures complementary aspects of lipid signaling. This review illustrates how these approaches reveal the spatiotemporal regulation and quantitative
Hiroaki Kajiho, Shin Morioka, Junko Sasaki, Takehiko Sasaki   +3 more
wiley   +1 more source

The Peculiar Type Ib Supernova 2006jc: A WCO Wolf-Rayet Star Explosion [PDF]

, 2008
We present a theoretical model for Type Ib supernova (SN) 2006jc. We calculate the evolution of the progenitor star, hydrodynamics and nucleosynthesis of the SN explosion, and the SN bolometric light curve (LC).
Anupama, G. C., Chieffi, A., Deng, J., Gurugubelli, U. K., Kaneda, H., Kawabata, K. S., Kozasa, T., Limongi, M., Maeda, K., Minezaki, T., Nomoto, K., Nozawa, T., Ohyama, Y., Onaka, T., Prabhu, T. P., Sahu, D. K., Sakon, I., Suzuki, T., Tanabé, T., Tanaka, M., Tominaga, N., Tornambe, A., Wada, T., Yoshii, Y.   +23 more
core   +2 more sources

An intracellular transporter mitigates the CO2‐induced decline in iron content in Arabidopsis shoots

FEBS Letters, EarlyView.
This study identifies a gene encoding a transmembrane protein, MIC, which contributes to the reduction of shoot Fe content observed in plants under elevated CO2. MIC is a putative Fe transporter localized to the Golgi and endosomal compartments. Its post‐translational regulation in roots may represent a potential target for improving plant nutrition ...
Timothy Mozzanino, Meijie Li, Cécile Fizames, Mattia Adamo, Laurence Lejay, Christian Dubos, Matthieu Platre, Antoine Martin   +7 more
wiley   +1 more source

JWST/MIRI Detection of a Carbon-rich Chemistry in the Disk of a Solar Nebula Analog

The Astrophysical Journal
It has been proposed, and confirmed by multiple observations, that disks around low-mass stars display a molecule-rich emission and carbon-rich disk chemistry as compared to their hotter, more massive solar counterparts.
María José Colmenares, Edwin A. Bergin, Colette Salyk, Klaus M. Pontoppidan, Nicole Arulanantham, Jenny Calahan, Andrea Banzatti, Sean Andrews, Geoffrey A. Blake, Fred Ciesla, Joel Green, Feng Long, Michiel Lambrechts, Joan Najita, Ilaria Pascucci, Paola Pinilla, Sebastiaan Krijt, Leon Trapman, the JDISCS Collaboration   +18 more
doaj   +1 more source

Molecular bases of circadian magnesium rhythms across eukaryotes

FEBS Letters, EarlyView.
Circadian rhythms in intracellular [Mg2+] exist across eukaryotic kingdoms. Central roles for Mg2+ in metabolism suggest that Mg2+ rhythms could regulate daily cellular energy and metabolism. In this Perspective paper, we propose that ancestral prokaryotic transport proteins could be responsible for mediating Mg2+ rhythms and posit a feedback model ...
Helen K. Feord, Gerben van Ooijen
wiley   +1 more source