Results 51 to 60 of about 720 (206)

Old pre-main-sequence stars - disc reformation by Bondi-Hoyle accretion [PDF]

, 2014
Young stars show evidence of accretion discs which evolve quickly and disperse with an e-folding time of ~3 Myr. This is in striking contrast with recent observations that suggest evidence of numerous >30 Myr old stars with an accretion disc in large ...
Scicluna, P., Scicluna, P, Dale, J. E., Testi, L, Testi, L., Dale, James, J. E. Dale, Rosotti, G., Rosotti, G, Dale, J., G. Rosotti, L. Testi, P. Scicluna, Dale, JE   +13 more
core   +1 more source

Cyclic Zoom: Multiscale GRMHD Modeling of Black Hole Accretion and Feedback

The Astrophysical Journal
We present a “cyclic zoom” method to capture the dynamics of accretion flows onto black holes across a vast range of spatial and temporal scales in general relativistic magnetohydrodynamic (GRMHD) simulations.
Minghao Guo, James M. Stone, Eliot Quataert, Volker Springel   +3 more
doaj   +1 more source

Simple Convective Accretion Flows (SCAFs): Explaining the ≈ −1 Density Scaling of Hot Accretion Flows around Compact Accretors

The Astrophysical Journal, 2023
Recent simulations find that hot gas accretion onto compact accretors is often highly turbulent and diskless, and shows a power-law density profile with slope α _ρ ≈ −1.
Wenrui Xu
doaj   +1 more source

Neuromuscular fatigability with repeated exercise in hypoxia: From single‐joint paradigms to sprints

The Journal of Physiology, EarlyView.
Abstract figure legend Acute hypobaric or normobaric hypoxic exposure accelerates neuromuscular fatigability during repeated exercise. Indices of peripheral and central fatigue are not different at exhaustion in mild, moderate and severe hypoxia compared with normoxia, but task failure occurs earlier.
Luca Ruggiero, Franck Brocherie, Olivier Girard, Nathan Townsend, Chris J. McNeil, Grégoire P. Millet   +5 more
wiley   +1 more source

Effects of extreme mountain ultramarathon on stress‐related biomarkers from multiple biological matrices in adult male runners

Physiological Reports, Volume 14, Issue 11, June 2026.
Abstract Prior investigations concerning finishers of the Tor des Géants (TDG) have demonstrated oxi‐inflammatory response. MicroRNAs (miRNAs) have been identified as prospective biomarkers for oxi‐inflammatory and stress responses. This study addressed the acute responses concerning salivary miRNAs, circulating redox markers and urinary exercise ...
Cristina Purcaro, Ester Sara Di Filippo, Alessandra Vezzoli, Danilo Bondi, Guido Giardini, Stefania Fulle, Vittore Verratti, Simona Mrakic‐Sposta   +7 more
wiley   +1 more source

Bondi Flow from a Slowly Rotating Hot Atmosphere [PDF]

, 2011
A supermassive black hole in the nucleus of an elliptical galaxy at the centre of a cool-core group or cluster of galaxies is immersed in hot gas. Bondi accretion should occur at a rate determined by the properties of the gas at the Bondi radius and the ...
Narayan, Ramesh, Fabian, Andrew C., Ramesh Narayan, Andrew C. Fabian   +3 more
core   +1 more source

Metabotropic glutamate receptor 5 is associated with plasma GFAP dependent on age

Alzheimer's &Dementia, Volume 22, Issue 5, May 2026.
Abstract INTRODUCTION We investigated the relationship between metabotropic glutamate receptor subtype 5 (mGluR5) availability and plasma biomarkers in individuals with cognitive impairment. METHODS Seventy‐one subjects were included (17 cognitively unimpaired [CU], 10 early‐onset cognitive impairment [EOCI], and 44 late‐onset cognitive impairment ...
Tangyue Hu, Yan Wang, Jie Wang, Xiaoxie Mao, Shuhua Ren, Kun He, Yihui Guan, Qi Huang, Binyin Li, Fang Xie   +9 more
wiley   +1 more source

The Effects of Gas Angular Momentum on the Formation of Magnetically Arrested Disks and the Launching of Powerful Jets

The Astrophysical Journal Letters, 2023
In this letter, we investigate Bondi-like accretion flows with zero or low specific angular momentum by performing 3D general relativistic magnetohydrodynamic simulations.
Tom M. Kwan, Lixin Dai, Alexander Tchekhovskoy   +2 more
doaj   +1 more source

Xanthatin‐13‐(Pyrrolidine‐2‐Carboxylic Acid), a Sesquiterpene Lactone Isolated From Burdock Leaf, Attenuated Aβ25‐35 Toxicity and Memory Deficits in a Pharmacological Mouse Model of Alzheimer's Disease

Phytotherapy Research, Volume 40, Issue 5, Page 2824-2843, May 2026.
ABSTRACT Alzheimer's disease (AD) is a severe form of dementia, which occurrence increases with age and lifestyle conditions. It is characterized by amyloid protein accumulation forming senile plaques, hyperphosphorylated tau protein forming neurofibrillary tangles, neuroinflammation, and oxidative stress, leading to synapse loss and cell death ...
Charlyne Barry‐Simonnet, Lucie Crouzier, Tristan Moujellil‐Legagneur, Hamza Chaieb‐Errass, Yanis A. Idres, Karine Ferrare, Marc Rolland, Guillaume Cazals, Patrick Poucheret, Tangui Maurice, Didier Tousch   +10 more
wiley   +1 more source

The Radiative Newtonian 1 < γ ≤ 1.66 and the Paczyński–Wiita γ = 5/3 Regime of Non-Isothermal Bondi Accretion onto a Massive Black Hole with an Accretion Disc

Galaxies, 2021
We investigate the non-isothermal Bondi accretion onto a supermassive black hole (SMBH) for the unexplored case when the adiabatic index is varied in the interval ...
Jose M. Ramírez-Velásquez, Leonardo Di G. Sigalotti, Ruslan Gabbasov, Jaime Klapp, Ernesto Contreras   +4 more
doaj   +1 more source