Results 111 to 120 of about 1,034,573 (296)

The first chemical enrichment in the universe and the formation of hyper metal-poor stars

, 2005
The recent discovery of a hyper metal-poor (HMP) star, whose metallicity Fe/H is smaller than 1/100,000 of the solar ratio, together with one earlier HMP star, has raised a challenging question if these HMP stars are the actual first generation, low mass
Iwamoto, Nobuyuki, Maeda, Keiichi, Nomoto, Ken'ichi, Tominaga, Nozomu, Umeda, Hideyuki   +4 more
core   +1 more source

Structural biology of ferritin nanocages

FEBS Letters, EarlyView.
Ferritin is a conserved iron‐storage protein that sequesters iron as a ferric mineral core within a nanocage, protecting cells from oxidative damage and maintaining iron homeostasis. This review discusses ferritin biology, structure, and function, and highlights recent cryo‐EM studies revealing mechanisms of ferritinophagy, cellular iron uptake, and ...
Eloise Mastrangelo, Flavio Di Pisa
wiley   +1 more source

STELLAR ACTIVITY CYCLES: WHY DO WE NEED IN THE LONG-TERM MEASUREMENTS OF THE MAGNETIC FIELD?

Odessa Astronomical Publications, 2017
Solution of the two important problems requires a study of long-term behavior of the magnetic field on stars with nondegenerate matter: firstly, to define the role of the magnetic field on different evolutionary stages of stars; secondly, to know the influence
S. I. Plachinda, V. V. Butkovskaya
doaj   +1 more source

Organ‐specific redox imbalances in spinal muscular atrophy mice are partially rescued by SMN antisense oligonucleotides

FEBS Letters, EarlyView.
We identified a systemic, progressive loss of protein S‐glutathionylation—detected by nonreducing western blotting—alongside dysregulation of glutathione‐cycle enzymes in both neuronal and peripheral tissues of Taiwanese SMA mice. These alterations were partially rescued by SMN antisense oligonucleotide therapy, revealing persistent redox imbalance as ...
Sofia Vrettou, Brunhilde Wirth
wiley   +1 more source

A Modified Initial Mass Function of the First Stars with Explodability Theory under Different Enrichment Scenarios

The Astrophysical Journal
The most metal-poor stars record the earliest metal enrichment triggered by Population III stars. By comparing observed abundance patterns with theoretical yields of metal-free stars, physical properties of their first star progenitors can be inferred ...
Ruizheng Jiang, Gang Zhao, Haining Li, Qianfan Xing   +3 more
doaj   +1 more source

Asteroseismology of Solar-type Stars with Kepler I: Data Analysis

, 2010
We report on the first asteroseismic analysis of solar-type stars observed by Kepler. Observations of three G-type stars, made at one-minute cadence during the first 33.5d of science operations, reveal high signal-to-noise solar-like oscillation spectra ...
Appourchaux, T., Basu, S., Bedding, T. R., Belkacem, K., Biazzo, K., Campante, T. L., Chaplin, W. J., Christensen-Dalsgaard, J., Cortes, T. Roca, Cunha, M. S., Eggenberger, P., Elsworth, Y., Fletcher, S. T., Garcia, R. A., Gaulme, P., Gilliland, R. L., Gruberbauer, M., Guzik, J. A., Handberg, R., Hekker, S., Houdek, G., Karoff, C., Kjeldsen, H., Kupka, F., Leroy, B., Ludwig, H. -G., Martic, M., Mathis, S., Mathur, S., Metcalfe, T. S., Molenda-Zakowicz, J., Monteiro, M. J. P. F. G., Mosser, B., Noels, A., Noyes, R. W., Regulo, C., Roth, M., Roxburgh, I. W., Salabert, D., Sato, K. H., Schmitt, J., Stello, D., Suran, M. D., Thompson, M. J., Trampedach, R., Uytterhoeven, K., Ventura, R., Verner, G. A, Wilson, P. A.   +48 more
core   +3 more sources

Transferrin receptor 1‐mediated iron uptake supports thermogenic activation in human cervical‐derived adipocytes

FEBS Letters, EarlyView.
In this study, we found that human cervical‐derived adipocytes maintain intracellular iron level by regulating the expression of iron transport‐related proteins during adrenergic stimulation. Melanotransferrin is predicted to interact with transferrin receptor 1 based on in silico analysis.
Rahaf Alrifai, Mizuki Seo, Gyath Karadsheh, Fachrur Rizal Mahendra, Máté Á Demény, Ferenc Győry, János András Mótyán, László Fésüs, Endre Kristóf, Rini Arianti   +9 more
wiley   +1 more source

RR Lyrae Stars in M4

EPJ Web of Conferences, 2017
Observations by Kepler/K2 have revolutionized the study of RR Lyrae stars by allowing the detection of new phenomna, such as low amplitude additional modes and period doubling, which had not previously been seen from the ground.
Kuehn Charles A, Moskalik Pawel, Drury Jason A.   +2 more
doaj   +1 more source

Variability of B and Be stars in the LMC/SMC: binaries and pulsations [PDF]

, 2008
To study the variability of the 523 B and Be stars observed in the Magellanic clouds with the VLT-FLAMES, we cross-matched the stars of our sample with the photometric database MACHO, which provides for each star an 8 years lightcurve.
Anne-marie Hubert, Christophe Martayan, Coralie Neiner, Jacco Th. Van Loon, Joana M. Oliveira, Juan Fabregat, Malek Mekkas, Michèle Floquet, Pascual Diago   +8 more
core   +4 more sources

Finding high-redshift dark stars with the James Webb Space Telescope

, 2010
The first stars in the history of the Universe are likely to form in the dense central regions of 10^5-10^6 Msolar cold dark matter halos at z=10-50. The annihilation of dark matter particles in these environments may lead to the formation of so-called ...
Broadhurst, Tom, Edvardsson, Bengt, Gondolo, Paolo, Iocco, Fabio, Rydberg, Claes-Erik, Scott, Pat, Sivertsson, Sofia, Zackrisson, Erik, Zitrin, Adi, Östlin, Göran   +9 more
core   +3 more sources