Results 101 to 110 of about 22,441 (303)

The growth of a lithium abundance dispersion in pre-main-sequence stars

Lithium is predicted, and observed, to be depleted in contracting low-mass pre-main-sequence (PMS) stars. Yet, these stars reach the zero-age main-sequence (ZAMS) with a spread in lithium abundance at a given effective temperature that is not predicted ...
Tognelli, E, Jeffries, R D, Jackson, R J
core   +1 more source

Pre-main sequence stars in open clusters

, 2007
Context.We present the basic ideas and first results from the project we are carrying out at present, the search for and characterisation of pre-main sequence (PMS) stars among the members of Galactic young clusters.
A. J. Delgado, E. J. Alfaro, J. L. Yun
core   +1 more source

Identification of a rare class of emission-line stars in transition between pre-main sequence to Main Sequence phase

, 2021
Over time, pre-main-sequence (PMS) stars evolve into main-sequence (MS) stars. Stars evolving from PMS to MS phase is a significant subject of research that aims to better understand stellar phases and their properties.
K T, Paul, Anusha R, Gourav Banerjee, S Kartha, Sreeja, Paul K T, Bhattacharyya, Suman, Banerjee, Gourav, Mathew, Blesson, Suman Bhattacharyya, Sreeja S Kartha, R, Anusha, Blesson Mathew   +11 more
core   +1 more source

PAK1 activation drives divergent resistance mechanisms to aromatase inhibition and tamoxifen in a luminal: A breast cancer model

Molecular Oncology, EarlyView.
Breast cancer remains a major cause of cancer death in women, frequently developing endocrine therapy resistance. This study demonstrates that upregulated p21‐activated kinase 1 (PAK1) activity drives resistance to tamoxifen and long‐term estrogen deprivation in ER+ breast cancer models.
Luisa Schwarzmüller, Janina Müller, Efstathios‐Iason Vlachavas, Lukas Beumers, Lena Fleischhacker, Sara Burmester, Angelika Wörner, Sabine Karolus, Dominic Helm, Cindy Körner, Stefan Wiemann   +10 more
wiley   +1 more source

Radial differential rotation leading to dipole collapse in pre-main-sequence stars

Astronomy & Astrophysics
Context. Despite significant progress in the observational characterization of stellar magnetic fields, the physical processes that govern their intensity and topology, which could certainly result from their formation history, remain poorly understood ...
Guseva A., Manchon L., Petitdemange L., Pinçon C.   +3 more
doaj   +1 more source

On the ages of pre-main-sequence stars in Taurus

The Astronomical Journal, 1992
A search for pre-main-sequence stars in a region of about 12.7 deg 2 near the L 1551 complex in the Taurus molecular cloud have been made. Only two new pre-main-sequence stars have been identified from optical spectra of 383 proper motion candidates on the basis of Li I 6707 A absorption.
M. Gomez, B. F. Jones, L. Hartmann, S. J. Kenyon, J. R. Stauffer, R. Hewett, I. N. Reid   +6 more
openaire   +1 more source

Abundance anomalies in pre-main-sequence stars. Stellar evolution models with mass loss

, 2010
International audienceAims: The effects of atomic diffusion on internal and surface abundances of A and F pre-main-sequence stars with mass loss are studied in order to determine at what age the effects materialize, as well as to further understand the ...
Michaud, Georges, M. Vick, Vick, Mathieu, G. Michaud, Richer, Jacques, Richard, Olivier, J. Richer, O. Richard   +7 more
core   +1 more source

ZW4864‐mediated inhibition of the β‐catenin/BCL9/BCL9L complex reveals therapeutic potential in bladder cancer

Molecular Oncology, EarlyView.
BCL9 and BCL9L drive bladder cancer progression by enhancing β‐catenin signaling, promoting proliferation, migration, invasion, and organoid growth. Genetic depletion of BCL9(L) suppresses malignant phenotypes, while pharmacological disruption of the β‐catenin/BCL9(L) complex with ZW4864 inhibits canonical Wnt signaling and tumor‐associated cellular ...
Roland Kotolloshi, Mandy Berndt‐Paetz, Eileen Lerner, Gregoire Najjar, Anca Azoitei, Krishna Pal Singh, Shailendra Kumar Gupta, Olaf Wolkenhauer, Cagatay Günes, Otmar Huber, Marc‐Oliver Grimm, Daniel Steinbach   +11 more
wiley   +1 more source

Effect of Time-varying X-Ray Emission from Stellar Flares on the Ionization of Protoplanetary Disks

The Astrophysical Journal
X-rays have significant impacts on cold, weakly ionized protoplanetary disks by increasing the ionization rate and driving chemical reactions. Stellar flares are explosions that emit intense X-rays and are the unique source of hard X-rays with an energy ...
Haruka Washinoue, Shinsuke Takasao, Kenji Furuya   +2 more
doaj   +1 more source

Mycobacterial cell division arrest and smooth‐to‐rough envelope transition using CRISPRi‐mediated genetic repression systems

FEBS Open Bio, EarlyView.
CRISPRI‐mediated gene silencing and phenotypic exploration in nontuberculous mycobacteria. In this Research Protocol, we describe approaches to control, monitor, and quantitatively assess CRISPRI‐mediated gene silencing in M. smegmatis and M. abscessus model organisms.
Vanessa Point, Wafaa Achache, Janïs Laudouze, Eliana Sepulveda Ramos, Mickaël Maziero, Céline Crauste, Stéphane Canaan, Pierre Santucci   +7 more
wiley   +1 more source