Results 51 to 60 of about 306,823 (323)

The Three Dimensional Structure of EUV Accretion Regions in AM Herculis Stars: Modeling of EUV Photometric and Spectroscopic Observations [PDF]

, 1998
We have developed a model of the high-energy accretion region for magnetic cataclysmic variables and applied it to {\it Extreme Ultraviolet Explorer} observations of 10 AM Herculis type systems.
Bailey J., Bailey J., Beuermann K., Cameron A. G. W., Cropper M. S., Ferrario L., Imamura J. N., King A. R., Kuijpers J., Martin M. Sirk, Mason K. O., Meggitt S. M. A., Ramsay G., Ramsay G., Rosen S. R., Schwope A. D., Schwope A. D., Schwope A. D., Schwope A. D., Steve B. Howell, Stockman H. S., Wickramasinghe D. T., Wickramasinghe D. T., Woelk U., Wu K.   +24 more
core   +3 more sources

By dawn or dusk—how circadian timing rewrites bacterial infection outcomes

FEBS Letters, EarlyView.
The circadian clock shapes immune function, yet its influence on infection outcomes is only beginning to be understood. This review highlights how circadian timing alters host responses to the bacterial pathogens Salmonella enterica, Listeria monocytogenes, and Streptococcus pneumoniae revealing that the effectiveness of immune defense depends not only
Devons Mo, Catherine S. Palmer, Jacqueline M. Kimmey   +2 more
wiley   +1 more source

Hot Accretion Flow in Two-Dimensional Spherical Coordinates: Considering Pressure Anisotropy and Magnetic Field

Universe, 2019
For systems with extremely low accretion rate, such as Galactic Center Sgr A* and M87 galaxy, the ion collisional mean free path can be considerably larger than its Larmor radius. In this case, the gas pressure is anisotropic to magnetic field lines.
Hui-Hong Deng, De-Fu Bu
doaj   +1 more source

How Much Mass do Supermassive Black Holes Eat in their Old Age?

, 2005
We consider the distribution of local supermassive black hole Eddington ratios and accretion rates, accounting for the dependence of radiative efficiency and bolometric corrections on the accretion rate.
Churazov E., Comastri A., Gilli R., Hopkins P. F., Kormendy J., Krolik J. H., Lars Hernquist, Meyer F., Narayan R., Philip F. Hopkins, Ramesh Narayan, Richstone D., Shakura N. I., Silk J., Soltan A.   +14 more
core   +1 more source

Hematopoietic (stem) cells—The elixir of life?

FEBS Letters, EarlyView.
The aging of HSCs (hematopoietic stem cells) and the blood system leads to the decline of other organs. Rejuvenating aged HSCs improves the function of the blood system, slowing the aging of the heart, kidney, brain, and liver, and the occurrence of age‐related diseases.
Emilie L. Cerezo, Jonah Anderson, Emilie Dinh Vedrenne, Noël Yeh Martín, Jette Lengefeld   +4 more
wiley   +1 more source

Accretion Disks

, 1995
49p. To appear in XXI Canary Islands Winter School of Astrophysics, ed. T. Shahbaz, CUP (significantly improved, expanded and updated version of an earlier text)
openaire   +6 more sources

Phosphatidylinositol 4‐kinase as a target of pathogens—friend or foe?

FEBS Letters, EarlyView.
This graphical summary illustrates the roles of phosphatidylinositol 4‐kinases (PI4Ks). PI4Ks regulate key cellular processes and can be hijacked by pathogens, such as viruses, bacteria and parasites, to support their intracellular replication. Their dual role as essential host enzymes and pathogen cofactors makes them promising drug targets.
Ana C. Mendes, Guilherme M. Azevedo, Amanda P. Barcellos, Diana Bahia   +3 more
wiley   +1 more source

Self-Similar Solution of Hot Accretion Flow with Anisotropic Pressure

Universe, 2019
For the accretion flow in extremely low-luminosity active galactic nuclei, such as our Galactic center (Sgr A*) and M 87, the collisional mean-free path of ions may be much larger than its gyroradius.
De-Fu Bu, Pei-Yao Xu, Bo-Cheng Zhu
doaj   +1 more source

Global dynamics of advection-dominated accretion flows with magnetically driven outflow

, 2009
We study the global dynamics of advection-dominated accretion flows (ADAFs) with magnetically driven outflows. A fraction of gases in the accretion flow is accelerated into the outflows, which leads to decreasing of the mass accretion rate in the ...
Armitage, Balbus, Balbus, Bisnovatyi-Kogan, Blandford, Blandford, Camenzind, Cao, Cao, Cao, Gammie, Guan, Ho, Ichimaru, Igumenshchev, Kato, Koide, Kudoh, Li, Li, Livio, Lubow, Lubow, Manmoto, McKinney, McKinney, McKinney, Michel, Narayan, Narayan, Narayan, Narayan, Narayan, Ogilvie, Ogilvie, Paczyński, Quataert, Quataert, Romanova, Shakura, Shuang-Liang Li, Spruit, Spruit, Stepney, Stone, Tout, Xie, Xinwu Cao, Xue, Yuan   +49 more
core   +1 more source

Accretion disk flares [PDF]

Symposium - International Astronomical Union, 1986
Flare activity on the sun may be attributed to the distortion of coronal magnetic field caused primarily by vortical (Shearing) photospheric motion. If an accretion disk is permeated by a magnetic field, the strong differential rotation of the disk will lead to similar stressing of the magnetosphere, and one may expect similar flare activity to occur ...
P. A. Sturrock, W. Yang
openaire   +1 more source