Results 81 to 90 of about 118,894 (281)

Mass flow and accretion through gaps in accretion discs [PDF]

Monthly Notices of the Royal Astronomical Society, 1999
15 pages, Latex, uses MN Latex style v1.4, accepted by MN.
openaire   +2 more sources

The Shewanella oneidensis Fic enzyme SoFic targets the switch‐I region of EF‐Tu for AMPylation

FEBS Letters, EarlyView.
Fic enzymes mediate diverse post‐translational modifications across all domains of life, including AMPylation. Prokaryotic EF‐Tu can be AMPylated and deAMPylated by the conserved Fic enzyme SoFic. Structural and biochemical approaches were used to characterize the effect of AMPylation on EF‐Tu, SoFic's enzymatic activities, and the enzyme‐target ...
Svenja Runge, Vivian Pogenberg, Alexander Baumgart, Bente Siebels, Hartmut Schlüter, Michael Hecht‐Bucher, Aymelt Itzen   +6 more
wiley   +1 more source

X-ray and radio observations of the AMXP MAXI J1957+032 covering the 2022–2025 outbursts

Astronomy & Astrophysics
We presented a comprehensive multi-epoch timing and multiwavelength analysis of the accreting millisecond X-ray pulsar MAXI J1957+032, covering two major outbursts in 2022 and 2025.
Li Zhaosheng, Kuiper Lucien, Pan Yuanyue, Xu Renxin, Ge Mingyu, Weng Shanshan, Peng Long, Yu Wenhui, Huang Yue, Zhang Liang, Song Liming, Molkov Sergey V., Lutovinov Alexander A., Zhang Shu, Zhang Shuang-Nan   +14 more
doaj   +1 more source

Accretion and Outflow from Young Stellar Disks

, 2010
We aim to monitor T Tauri star disk emission features and jet outflow morphologies to determine how these features vary with disk accretion rate, and how and when the outflow responds to major accretion events. Young stars are surrounded by circumstellar
Bicknell, Geoffrey, McGregor, Peter, Salmeron, Raquel, White, Marc, Beck, Tracy   +4 more
core  

L‐aspartate oxidase provides new insights into fumarate reduction in anaerobic darkness in Synechocystis sp. PCC6803

FEBS Letters, EarlyView.
Synechocystis strains deficient in succinate dehydrogenase (SDH) secrete more succinate than the WT under dark anaerobic conditions, supporting that SDH then primarily acts as SDH, not as a fumarate reductase. L‐aspartate oxidase (Laspo) from Synechocystis is functional under anaerobic conditions, reducing fumarate to succinate.
Kateryna Kukil, Jeffrey A. Hawkes, Cecilia Blikstad, Pia Lindberg   +3 more
wiley   +1 more source

Interaction between disk and extended corona in a general relativistic framework

Astronomy & Astrophysics
Context. The energy equilibrium between the corona and the underlying disk in a two-phase accretion flow sets a lower limit on the achievable photon index.
Datta Sudeb Ranjan, Bursa Michal, Dovciak Michal, Zhang Wenda   +3 more
doaj   +1 more source

RNA‐related functions of BRCA2 in transcription, replication, and genome stability

FEBS Letters, EarlyView.
Beyond its role in homologous recombination, BRCA2 regulates R‐loop homeostasis, DNA–RNA hybrid resolution, RNA polymerase II dynamics, and transcriptional activation. Disruption of any of these functions can contribute to genome instability, inflammatory signaling, and tumorigenesis. BRCA2 is a central tumor suppressor protein best known for its roles
Lucia Alvaro‐Aranda, Sreerama Chaitanya Sridhara, Aura Carreira   +2 more
wiley   +1 more source

XMM-Newton multi-year campaign on NGC 55 ULX-1

Astronomy & Astrophysics
Context. Winds are an important ingredient in the evolution of X-ray binary (XRB) systems, particularly those at high accretion rates such as ultra-luminous X-ray sources (ULXs), because they may regulate the accretion of matter onto the compact object ...
Pinto C., Caserta S., Barra F., Xu Y., Barret D., Kosec P., La Palombara N., Marino A., Pintore F., Riggio A., Roberts T. P., Salvaggio C., Sidoli L., Soria R., Walton D. J.   +14 more
doaj   +1 more source

Artificial molecular machines and motors—Design and control of nanoscale motion

FEBS Letters, EarlyView.
Molecules are constantly moving because of thermal fluctuations, but random motion alone cannot be exploited to perform directional tasks. Artificial molecular machines use chemical, electrical, or light energy to bias this motion. Molecular shuttles, rotary motors, and supramolecular pumps illustrate how nanoscale movement can be controlled and ...
Leonardo Andreoni, Alberto Credi
wiley   +1 more source

Double-hump spectrum, pulse profile dip, and pulsed fraction spectra from the low-accretion regime in the X-ray pulsar MAXI J0655-013

Astronomy & Astrophysics
Context. Accreting X-ray pulsars (XRPs) undergo different physical regimes depending on different mass accretion rates, with related changes in the emitted X-ray spectral properties.
Malacaria C., Pike S. N., D’Aì A., Israel G. L., Ducci L., Rothschild R. E., Stella L., Amato R., Ambrosi E., Coley J. B., Fürst F., Imbrogno M., Kretschmar P., Maniadakis D. K., Papitto A., Pradhan P., Rouco Escorial A., Simongini A., Stierhof J., West B. F., Zalot N.   +20 more
doaj   +1 more source