Results 41 to 50 of about 203,115 (295)
Mechanism of the chromosome-induced polar body extrusion in mouse eggs
Cell Division, 2011 Background An oocyte undergoes two rounds of asymmetric division to generate a haploid gamete and two small polar bodies designed for apoptosis. Chromosomes play important roles in specifying the asymmetric meiotic divisions in the oocytes but the ...
Racowsky Catherine +2 more
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Polar observations of electron density distribution in the Earth’s magnetosphere. 1. Statistical results [PDF]
Annales Geophysicae, 2002 Forty-five months of continuous spacecraft potential measurements from the Polar satellite are used to study the average electron density in the magnetosphere and its dependence on geomagnetic activity and season.
H. Laakso +3 more
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Initial results from Soviet unmanned magnetometer network in Antarctica
Antarctic Record, 1986 During the last decade the unmanned magnetometer network across the southern polar cap along geomagnetic meridian 110°between corrected geomagnetic latitudes -75 and -89°has been successfully operated.
V.O. Papitashvili, A.N. Zaitzev
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Polarized QED cascades over pulsar polar caps
Monthly Notices of the Royal Astronomical SocietyABSTRACT The formation of e± plasmas within pulsar magnetospheres through quantum electrodynamics (QED) cascades in vacuum gaps is widely acknowledged. This paper aims to investigate the effect of photon polarization during the QED cascade occurring over the polar cap of a pulsar.
Huai-Hang Song, Matteo Tamburini
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A statistical study of polar cap flow channels observed in both hemispheres using SuperDARN radars
Journal of Space Weather and Space Climate, 2022 This paper details the first large-scale, interhemispheric statistical study into ionospheric fast flow (>900 m/s) channels in the polar cap using the SuperDARN radar network.
Herlingshaw Katie +4 more
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Martian north polar cap summer water cycle
, 2016 A key outstanding question in Martian science is 'are the polar caps gaining or losing mass and what are the implications for past, current and future climate?' To address this question, we use observations from the Compact Reconnaissance Imaging ...
Becerra, Patricio +3 more
core +1 more source
Sequence determinants of RNA G‐quadruplex unfolding by Arg‐rich regions
FEBS Letters, EarlyView.We show that Arg‐rich peptides selectively unfold RNA G‐quadruplexes, but not RNA stem‐loops or DNA/RNA duplexes. This length‐dependent activity is inhibited by acidic residues and is conserved among SR and SR‐related proteins (SRSF1, SRSF3, SRSF9, U1‐70K, and U2AF1).
Naiduwadura Ivon Upekala De Silva +10 more
wiley +1 more source
Polar observations of electron density distribution in the Earth’s magnetosphere. 2. Density profiles [PDF]
Annales Geophysicae, 2002 Using spacecraft potential measurements of the Polar electric field experiment, we investigate electron density variations of key plasma regions within the magnetosphere, including the polar cap, cusp, trough, plasmapause, and auroral zone.
H. Laakso +3 more
doaj +1 more source
Dead zone in the polar-cap accelerator of pulsars
, 2012 We study plasma flows above pulsar polar caps using time-dependent simulations of plasma particles in the self-consistent electric field. The flow behavior is controlled by the dimensionless parameter alpha=(j/c rho_GJ) where j is the electric current ...
Alexander Y. Chen +10 more
core +1 more source
Eos, Transactions American Geophysical Union, 1985 Mount Denali (McKinley), the Alaska Range, and countless glaciers welcomed all 86 participants of the Chapman Conference on the Magnetospheric Polar Cap, which was held on the University of Alaska, Fairbanks campus (UAF), on August 6–9, 1984. The magnetospheric polar cap is the highest latitude region of the earth which is surrounded by the ring of ...
S. I Akasofu, J. R. Kan
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