Results 61 to 70 of about 278,789 (290)

Accretion disk instabilities [PDF]

International Astronomical Union Colloquium, 1986
In this article we discuss two instabilities of stationary accretion disks which lead to an understanding of observed light variations in accretion disk systems, the dwarf novae and the rapid burster MXB 17030-335. The accretion disks in these systems avoid instability at the cost of stationarity and perform stable cycles in which sudden changes of the
openaire   +1 more source

Wind accretion in binary stars — II. Accretion rates [PDF]

Monthly Notices of the Royal Astronomical Society, 1996
13 pages, mn style, 5 figures, to be published by ...
Theuns, T., Boffin, Henri, Jorissen, Alain   +2 more
openaire   +2 more sources

Structural instability impairs function of the UDP‐xylose synthase 1 Ile181Asn variant associated with short‐stature genetic syndrome in humans

FEBS Letters, EarlyView.
The Ile181Asn variant of human UDP‐xylose synthase (hUXS1), associated with a short‐stature genetic syndrome, has previously been reported as inactive. Our findings demonstrate that Ile181Asn‐hUXS1 retains catalytic activity similar to the wild‐type but exhibits reduced stability, a looser oligomeric state, and an increased tendency to precipitate ...
Tuo Li, Pedro A. Sánchez‐Murcia, Bernd Nidetzky   +2 more
wiley   +1 more source

General relativistic radiative transfer: formulation and emission from structured tori around black holes

, 2012
We construct a general relativistic radiative transfer (RT) formulation, applicable to particles with or without mass in astrophysical settings. Derived from first principles, the formulation is manifestly covariant.
Abramowicz, Abramowicz, Anderson, Baiotti, Balbus, Bao, Baschek, Beckwith, Beckwith, Beckwith, Blaes, Boyer, Carter, Chakrabarti, Cunningham, Dexter, Dolence, Eracleous, Fabian, Fabian, Fanton, Fuerst, Fuerst, Gerbal, Hawley, Horne, Hölzer, Johnston, K. Wu, Kojima, Kozlowski, Lynden-Bell, Marsh, Puchnarewicz, Reynolds, Rezzolla, S. V. Fuerst, Salpeter, Schnittman, Shakura, Shibata, Smak, Sochora, Soria, Stella, Strateva, Tanaka, Vincent, Wang, Wu, Wu, Wu, Z. Younsi, Zane, Čadež   +54 more
core   +1 more source

X-ray Photoevaporation-starved T Tauri Accretion [PDF]

, 2009
X-ray luminosities of accreting T Tauri stars are observed to be systematically lower than those of non-accretors. There is as yet no widely accepted physical explanation for this effect, though it has been suggested that accretion somehow suppresses ...
Alcala, Allard, Barbara Ercolano, Calvet, Chmielewski, D'Alessio, Dahm, Ercolano, Ercolano, Ercolano, Ettore Flaccomio, Feigelson, Flaccomio, Flaccomio, Getman, Giusi Micela, Gorti, Gregory, Hillenbrand, Jeremy J. Drake, Lamzin, Lamzin, Mohanty, Muzerolle, Neuhaeuser, Preibisch, Siess, Smith, Smith, Stassun, Wichmann   +30 more
core   +1 more source

Massive star formation by accretion [PDF]

Astronomy & Astrophysics, 2015
Massive stars likely form by accretion and the evolutionary track of an accreting forming star corresponds to what is called the birthline in the HR diagram. The shape of this birthline is quite sensitive to the evolution of the entropy in the accreting star.
Haemmerlé Lionel, Eggenberger Patrick, Meynet Georges, Maeder André, Charbonnel Corinne   +4 more
openaire   +3 more sources

The (Glg)ABCs of cyanobacteria: modelling of glycogen synthesis and functional divergence of glycogen synthases in Synechocystis sp. PCC 6803

FEBS Letters, EarlyView.
We reconstituted Synechocystis glycogen synthesis in vitro from purified enzymes and showed that two GlgA isoenzymes produce glycogen with different architectures: GlgA1 yields denser, highly branched glycogen, whereas GlgA2 synthesizes longer, less‐branched chains.
Kenric Lee, Dimitrios Bekiari, Sofia Doello, Karl Forchhammer   +3 more
wiley   +1 more source

Evolution of Massive Protostars via Disk Accretion

, 2010
Mass accretion onto (proto-)stars at high accretion rates > 10^-4 M_sun/yr is expected in massive star formation. We study the evolution of massive protostars at such high rates by numerically solving the stellar structure equations.
Bodenheimer, Bontemps, Cesaroni, Cox, Furuya, Harold W. Yorke, Hartmann, Hosokawa, Hosokawa, Hosokawa, Kazuyuki Omukai, Kippenhahn, Krumholz, Larson, McKee, Neo, Norberg, Omukai, Omukai, Schaller, Sridharan, Takashi Hosokawa, Tan, Walmsley, Wang, Yorke, Yorke, Zhang   +27 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

The Accretion Rates and Spectral Energy Distributions of BL Lacertae Objects

, 2002
We investigate the relationship between accretion rates and the spectral energy distributions (SEDs) of BL Lac objects, using a sample of objects for which published information on the host galaxies, emission-line luminosities, and peak frequencies and ...
Abraham R. G., Blandford R. D., Celotti A., Celotti A., Comastri A., Corbett E. A., Falcke H., Falomo R., Falomo R., Giommi P., Jian‐Min Wang, Luis C. Ho, Perez E., Rudiger Staubert, Stickel M., Wolter A.   +15 more
core   +1 more source