Results 81 to 90 of about 1,598,590 (349)

The physics of galactic winds driven by active galactic nuclei [PDF]

, 2012
Active galactic nuclei (AGN) drive fast winds in the interstellar medium of their host galaxies. It is commonly assumed that the high ambient densities and intense radiation fields in galactic nuclei imply short cooling times, thus making the outflows ...
C. Faucher-Giguére, E. Quataert
semanticscholar   +1 more source

Calpain small subunit homodimerization is robust and calcium‐independent

FEBS Letters, EarlyView.
Calpains dimerize via penta‐EF‐hand (PEF) domains. Using single‐molecule force spectroscopy, we measured the strength and kinetics of PEF–PEF homodimer binding. The interaction is robust, shows a transient conformational step before dissociation, and remains largely insensitive to Ca2+.
Nesha May O. Andoy, Trina Dykstra‐MacPherson, Mathias A. Bell, Peter L. Davies, Ruby May A. Sullan   +4 more
wiley   +1 more source

Semi-analytic Simulations of Galactic Winds: Volume Filling Factor, Ejection of Metals and Parameter Study

, 2005
We present a semi-analytic treatment of galactic winds within high resolution, large scale cosmological N-body simulations of a LCDM Universe. The evolution of winds is investigated by following the expansion of supernova driven superbubbles around the ...
Adelberger, Aguirre, Cecil, Cecil, Ciardi, Cowie, Croft, Dekel, Efstathiou, Ellison, Felix Stoehr, Frye, Haiman, Heckman, Heckman, Heckman, Hoopes, Jenkins, Kauffmann, Mac Low, Madau, Martin, McKee, McKernan, Navarro, Nicastro, Ostriker, Pettini, Phillips, Rauch, Schaye, Schaye, Serena Bertone, Simcoe, Simon D. M. White, Springel, Springel, Springel, Strickland, Sugai, Sutherland, Thacker, Theuns, Theuns, Tormen, Walter, Yoshida   +46 more
core   +2 more sources

Stratified Magnetically-Driven Accretion-Disk Winds and Their Relations to Jets [PDF]

, 2013
We explore the poloidal structure of two-dimensional (2D) MHD winds in relation to their potential association with the X-ray warm absorbers (WAs) and the highly-ionized ultra-fast outflows (UFOs) in AGN, in a single unifying approach.
Behar, Ehud, Contopoulos, Ioannis, Fukumura, Keigo, Kazanas, Demosthenes, Shrader, Chris, Tombesi, Francesco   +5 more
core   +3 more sources

A methionine‐lined active site governs carbocation stabilization and product specificity in a bacterial terpene synthase

FEBS Letters, EarlyView.
This study reveals a unique active site enriched in methionine residues and demonstrates that these residues play a critical role by stabilizing carbocation intermediates through novel sulfur–cation interactions. Structure‐guided mutagenesis further revealed variants with significantly altered product profiles, enhancing pseudopterosin formation. These
Marion Ringel, Carl P. O. Helmer, Shani Zev, Ronja Driller, Emily Buhr, Markus Reinbold, Renana Schwartz, Gabriel Foley, Mikael Boden, Daniel Garbe, Gerhard Schenk, Dan Thomas Major, Bernhard Loll, Thomas Brück   +13 more
wiley   +1 more source

Oceanographic and climatic variability in the lower gulf of california: links with the tropics and north pacific

Ciencias Marinas, 2001
The links between climate and oceanography in the lower Gulf of California (LGC) and the observed physical variability in the open Pacific were studied on interannual to decadal timescales.
G Bernal, P Ripa, JC Herguera
doaj   +1 more source

The detection dogs test is more sensitive than real-time PCR in screening for SARS-CoV-2

Communications Biology, 2021
Hag-Ali and colleagues highlight the potential for using trained dogs for detecting COVID-19 positive patients. The dogs, originally trained for explosives detection, were able to detect COVID-19 positive sweat samples with a sensitivity rivaling the ...
Mohammed Hag-Ali, Abdul Salam AlShamsi, Linda Boeijen, Yasser Mahmmod, Rashid Manzoor, Harry Rutten, Marshal M. Mweu, Mohamed El-Tholoth, Abdullatif Alteraifi AlShamsi   +8 more
doaj   +1 more source

Stellar Feedback in Galaxies and the Origin of Galaxy-scale Winds [PDF]

, 2011
Feedback from massive stars is believed to play a critical role in driving galactic superwinds that enrich the intergalactic medium and shape the galaxy mass function, massmetallicity relation, and other global galaxy properties.
P. Hopkins, E. Quataert, N. Murray
semanticscholar   +1 more source

Organizing the interface—Plasma membrane architecture and receptor dynamics in virus‐cell interactions

FEBS Letters, EarlyView.
Plasma membranes contain dynamic nanoscale domains that organize lipids and receptors. Because viruses operate at similar scales, this architecture shapes early infection steps, including attachment, receptor engagement, and entry. Using influenza A virus and HIV‐1 as examples, we highlight how receptor nanoclusters, multivalent glycan interactions ...
Jan Schlegel, Christian Sieben
wiley   +1 more source

Timing of the Recent Migration and Intensification of the Southern Hemisphere Westerly Winds

Geophysical Research Letters
In recent decades, the Southern Hemisphere westerly winds have strengthened and migrated south, attributed to greenhouse gas emissions and stratospheric ozone depletion. However, the onset and acceleration of these drivers is coincident with the start of
Dieter R. Tetzner, Claire S. Allen, Elizabeth R. Thomas, Eric W. Wolff, Christian L. E. Franzke   +4 more
doaj   +1 more source