Results 151 to 160 of about 491,052 (394)

Radiative properties and QPOs around charged black hole in Kalb–Ramond gravity

European Physical Journal C: Particles and Fields
Studies of accretion disc luminosities and quasiperiodic oscillations around black holes may help us understand the gravitational properties of black hole spacetime.
Shokhzod Jumaniyozov, Muhammad Zahid, Mirzabek Alloqulov, Inomjon Ibragimov, Javlon Rayimbaev, Sardor Murodov   +5 more
doaj   +1 more source

XMM-Newton observations of OY Car III: OM light curve modelling, X-ray timing and spectral studies

, 2003
We revisit the XMM-Newton observations of the dwarf nova OY Car taken in July 2000 which occured shortly after an outburst. Ramsay et al (2001a) found a prominent energy dependent modulation at a period of 2240 sec: this modulation was only seen for app.
Hakala, Pasi, Ramsay, Gavin
core   +1 more source

Distinguishing black holes from naked singularities through their accretion disc properties [PDF]

, 2013
We show that, in principle, a slowly evolving gravitationally collapsing perfect fluid cloud can asymptotically settle to a static spherically symmetric equilibrium configuration with a naked singularity at the center.
P. Joshi, D. Malafarina, R. Narayan
semanticscholar   +1 more source

Polarization‐resolved femtosecond Vis/IR spectroscopy tailored for resolving weak signals in biological samples using minimal sample volume

FEBS Open Bio, EarlyView.
Unique biological samples, such as site‐specific mutant proteins, are available only in limited quantities. Here, we present a polarization‐resolved transient infrared spectroscopy setup with referencing to improve signal‐to‐noise tailored towards tracing small signals. We provide an overview of characterizing the excitation conditions for polarization‐
Clark Zahn, Karsten Heyne
wiley   +1 more source

Bayesian fitting of Taurus brown dwarf spectral energy distributions

, 2012
We present derived stellar and disc parameters for a sample of Taurus brown dwarfs both with and without evidence of an associated disc. These parameters have been derived using an online fitting tool (http://bd-server.astro.ex.ac.uk/), which includes a ...
Acreman, Allard, Asplund, Baraffe, Bertout, Bessell, Bessell, Bessell, Bessell, Bouvier, Bouy, Briceño, Burningham, Camenzind, Carpenter, Cash, Chabrier, Clarke, Cohen, Da Rio, David M. Acreman, Dougados, Dullemond, Elias, Fukugita, Griffin, Guieu, Guieu, Guieu, Harries, Harries, Hauschildt, Hawarden, Hayes, Herbst, Herczeg, Holland, Indebetouw, Jayawardhana, Jayawardhana, Jeffries, John Rowe, Johnson, Klein, Koenigl, Konopacky, Kraus, Kraus, Kurosawa, Landolt, Littlefair, Lucy, Luhman, Luhman, Luhman, Luhman, Luhman, Luhman, Martín, Mayne, Mayne, Mayne, Min, Mohanty, Monnier, Muzerolle, Muzerolle, N. J. Mayne, Naylor, Neugebauer, Olofsson, Pinte, Poglitsch, Poglitsch, Reach, Rieke, Robitaille, Robitaille, Scholz, Siess, Simons, Skrutskie, Stauffer, Stephens, Tannirkulam, Tannirkulam, Tim J. Harries, Tokunaga, Torres, Walker, Watson, White, Whitney, Wood, Zacharias   +94 more
core   +1 more source

Dynamos in accretion discs

, 2007
8 pages, 7 figures, proceedings of Coronae of Stars and Accretion Disks, Bonn, December 2006, to be published in Memorie della Societa Astronomica ...
Brandenburg, A., von Rekowski, B.
openaire   +2 more sources

Nuclear pore links Fob1‐dependent rDNA damage relocation to lifespan control

FEBS Open Bio, EarlyView.
Damaged rDNA accumulates at a specific perinuclear interface that couples nucleolar escape with nuclear envelope association. Nuclear pores at this site help inhibit Fob1‐induced rDNA instability. This spatial organization of damage handling supports a functional link between nuclear architecture, rDNA stability, and replicative lifespan in yeast.
Yamato Okada, Mina Iwaki, Kyosuke Hagiri, Rei Izumi, Masahiko Harata, Chihiro Horigome   +5 more
wiley   +1 more source

Coronae Above Accretion Discs [PDF]

Symposium - International Astronomical Union, 1976
A turbulent accretion disc generates acoustic noise which, on propagation upward into the tenuous upper layers, forms shock waves. These give rise to a corona above the disc, thereby providing the possibility to determine observationally the existence (or otherwise) of turbulence in the disc. Models for stationary coronae of this type are calculated on
openaire   +1 more source

Dihydroorotate dehydrogenase (DHODH) regulates trophoblast syncytialization through organelle stress–induced cellular senescence

FEBS Open Bio, EarlyView.
The inhibition of mitochondrial dihydroorotate dehydrogenase (DHODH) impairs syncytialization and induces cellular senescence via mitochondrial and endoplasmic reticulum stress in human trophoblast stem cells, elevating sFlt1/PlGF levels, a hallmark of placental dysfunction in hypertensive disorders of pregnancy.
Kanoko Yoshida, Kazuya Kusama, Ayaka Horiuchi, Yu Kawaguchi, Atsuya Tsuru, Mikihiro Yoshie, Kazuhiro Tamura   +6 more
wiley   +1 more source

NR4A1 Exerts Pro‐Tumor Role in Glioblastoma via Inducing xCT/GPX4‐Regulated Ferroptosis

Annals of Clinical and Translational Neurology, EarlyView.
ABSTRACT Purpose This study investigates NR4A1's paradoxical roles in glioblastoma (GBM) progression, focusing on its mechanistic link to ferroptosis regulation. We aimed to resolve conflicting reports of NR4A1 as both an oncogene and a tumor suppressor by defining its transcriptional control over xCT/GPX4‐mediated iron homeostasis and its clinical ...
Peng Tao, Shikuan Din, Zhengkang Fu, Qian Sun, Xiwei Zhu, Yuxin Wei, Huan Qu, Xinyi Zhang, Jiaxuan Liu, Chuhua Fu, Qianxue Chen   +10 more
wiley   +1 more source