Results 71 to 80 of about 177,034 (301)

Field-aligned currents in nonlinear auroral vortices

, 2023
Velocity shears at the boundary layer that forms between a planetary magnetosheath and its magnetosphere can serve as effective voltage generators driving field-aligned currents and powering auroral emissions. Previously, an analytic solution was developed for the field aligned currents and electron precipitation assuming a linear Knight relation as an
Johnson, J., Navarro, A., Wing, S.
openaire   +2 more sources

Steady‐state field‐aligned currents at Mercury [PDF]

Geophysical Research Letters, 2014
AbstractMagnetic field observations acquired in orbit about Mercury by the MESSENGER spacecraft demonstrate the presence in the planet's northern hemisphere of Birkeland currents that flow to low altitudes. Currents of density 10–30 nA/m2 flow downward at dawn and upward at dusk.
Anderson, Brian J., Johnson, Catherine L., Korth, Haje, Slavin, James A., Winslow, Reka M., Phillips, Roger J., McNutt, Ralph L., Jr., Solomon, Sean C.   +7 more
openaire   +4 more sources

Strong ionospheric field‐aligned currents for radial interplanetary magnetic fields [PDF]

, 2014
The present work has investigated the configuration of field‐aligned currents (FACs) during a long period of radial interplanetary magnetic field (IMF) on 19 May 2002 by using high‐resolution and precise vector magnetic field measurements of CHAMP ...
Cao, Xue, Frey, Harald. U., Huang, Tao, Kervalishvili, Guram, Lühr, Hermann, Pi, Gilbert, Ridley, Aaron J., Shue, Jih‐hong, Wang, Hui   +8 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

Statistical dependence of auroral ionospheric currents on solar wind and geomagnetic parameters from 5 years of CHAMP satellite data [PDF]

Annales Geophysicae, 2009
The effects of the solar wind dynamic pressure (P), the z component of the solar wind magnetic field (Bz), the merging electric field (Em), season and the Kp index on R1 and R2 field-aligned currents are studied statistically using magnetic field data
L. Juusola, K. Kauristie, O. Amm, P. Ritter   +3 more
doaj   +1 more source

Magnetosphere-ionosphere coupling currents in Jupiter's middle magnetosphere: effect of magnetosphere-ionosphere decoupling by field-aligned auroral voltages [PDF]

, 2005
We consider the effect of field-aligned voltages on the magnetosphere-ionosphere coupling current system associated with the breakdown of rigid corotation of equatorial plasma in Jupiter's middle magnetosphere. Previous analyses have assumed perfect
J. D. Nichols, S. W. H. Cowley
core   +3 more sources

Transferrin receptor 1‐mediated iron uptake supports thermogenic activation in human cervical‐derived adipocytes

FEBS Letters, EarlyView.
In this study, we found that human cervical‐derived adipocytes maintain intracellular iron level by regulating the expression of iron transport‐related proteins during adrenergic stimulation. Melanotransferrin is predicted to interact with transferrin receptor 1 based on in silico analysis.
Rahaf Alrifai, Mizuki Seo, Gyath Karadsheh, Fachrur Rizal Mahendra, Máté Á Demény, Ferenc Győry, János András Mótyán, László Fésüs, Endre Kristóf, Rini Arianti   +9 more
wiley   +1 more source

Structural insights into an engineered feruloyl esterase with improved MHET degrading properties

FEBS Letters, EarlyView.
A feruloyl esterase was engineered to mimic key features of MHETase, enhancing the degradation of PET oligomers. Structural and computational analysis reveal how a point mutation stabilizes the active site and reshapes the binding cleft, expading substrate scope.
Panagiota Karampa, Konstantinos Makryniotis, Theofani‐Iosifina Sousani, Evangelos Topakas, Vangelis Daskalakis, Maria Dimarogona   +5 more
wiley   +1 more source

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

Models of field-aligned currents needful to simulate the substorm variations of the electric field and other parameters observed by EISCAT [PDF]

Annales Geophysicae, 1996
We have used the global numerical model of the coupled ionosphere-thermosphere-protonosphere system to simulate the electric-field, ion- and electron-temperature and -concentration variations observed by EISCAT during the substorm event of 25 March ...
M. A. Volkov, A. A. Namgaladze, A. A. Namgaladze   +2 more
doaj   +1 more source