Results 81 to 90 of about 8,556 (157)

Reduced Geomagnetic Shielding During the Laschamps Excursion and Its Impact on Cosmic‐Ray‐Induced Atmospheric Radiation

Journal of Geophysical Research: Space Physics, Volume 131, Issue 2, February 2026.
Abstract The Laschamps geomagnetic excursion (≈41,000 years BP) was a period of significant weakening and incomplete reversal of the Earth's magnetic field. The weakening substantially reduced geomagnetic shielding against cosmic rays (CRs), which contribute to phenomena at Earth, such as cosmogenic isotope production, and atmospheric ionisation and ...
N. Larsen, I. Usoskin, A. Mishev, S. Koldobskiy, P. Väisänen   +4 more
wiley   +1 more source

Characterisation of a Novel Jumbo Lytic Aeromonas dhakensis Bacteriophage P19 and Its Endolysin

Microbial Biotechnology, Volume 19, Issue 1, January 2026.
A jumbo, lytic myovirus phage P19 against multidrug‐resistant (MDR) Aeromonas dhakensis was isolated from river water. P19 demonstrated robust lytic activity, high thermal and pH stability (pH 6–10, up to 60°C), and no genes associated with lysogeny, virulence or antimicrobial resistance. ORF_358 of P19 encodes for T4‐type lysozyme.
Farhat Ansari, Vandan Nagar
wiley   +1 more source

Giant Cyclones in Gaseous Discs of Spiral Galaxies

, 2000
We report detection of giant cyclonic vortices in the gaseous disc of the spiral galaxy NGC 3631 in the reference frame rotating with the spiral pattern.
A.M. Fridman, A.V. Moiseev, A.V. Zasov, Afanasiev, Baev, Contopoulos, EV. Polyachenko, Fridman, Fridman, Fridman, Lyakhovich, Lyakhovich, O.K. Sil'chenko, O.V. Khoruzhii, S.N. Dodonov, Sumin, V.L. Afanas'ev   +16 more
core   +2 more sources

Identification and Evaluation of Conserved Subunit Vaccine Candidates Conferring Cross‐Serotype Protection Against Streptococcus suis Serotypes 2, 7, 8, and 9

Transboundary and Emerging Diseases, Volume 2026, Issue 1, 2026.
Streptococcus suis is a major zoonotic pathogen with substantial serotype diversity and remains a serious threat to global swine production and public health. Accordingly, vaccines capable of inducing cross‐serotype protection are urgently needed.
Shun Kang, Hongkun Zhuang, Zeren Peng, Liye Chen, Jinlu Zhu, Zongfu Wu, Zhong Peng   +6 more
wiley   +1 more source

Dynamic Chiral Plasmonic Systems‐Based on Spiropyran Derivatives and Gold Nanorods

Advanced Materials Interfaces, Volume 12, Issue 23, December 8, 2025.
Soft chiral plasmonic nanocomposites are prepared by embedding gold nanorods into spiropyran‐based supramolecular gels. The system self‐assembles into helical structures, enabling plasmonic circular dichroism. When illuminated with UV light spiropyran–merocyanine isomerization occurs, inducing reversible nanoscale reorganization and modulation of the ...
Ewelina Tomczyk, Maciej Bagiński, Dorota Szepke, Wiktor Lewandowski, Michał Wójcik   +4 more
wiley   +1 more source

Soft band X/K luminosity ratios in late-type galaxies and constraints on the population of supersoft X-ray sources

, 2010
We study X-ray to K-band luminosity ratios (L_X/L_K) of late-type galaxies in the 0.3-0.7 keV energy range. From the Chandra archive, we selected nine spiral and three irregular galaxies with point source detection sensitivity better than 5 x 10^36 erg/s
Bavouzet, Bell, Bogdán, Bogdán, Di Stefano, Di Stefano, Dickey, Freedman, Gilfanov, Gilfanov, Grimm, Hachisu, Hachisu, Iben, Irwin, Jarrett, Kahabka, Karachentsev, Leonard, M. Gilfanov, Mannucci, Mannucci, Nomoto, Perlmutter, Riess, Sazonov, Scannapieco, Shtykovskiy, Sullivan, Walter, Á. Bogdán   +30 more
core   +1 more source

Grand Design vs. Multi-Armed Spiral Galaxies: Dependence on Galaxy Structure

We developed an algorithm to use Galaxy Zoo 3D spiral arm masks produced by citizen scientist volunteers to semi-automatically classify spiral galaxies as either multi-armed or grand design spirals. Our final sample consists of 299 multi-armed and 245 grand design galaxies.
Smith, Beverly J., Watson, Matthew, Giroux, Mark L., Struck, Curtis   +3 more
openaire   +2 more sources

Review of Analytical Lithium Detection and Quantification Methods Along the Lithium Value Chain

Applied Research, Volume 4, Issue 6, December 2025.
This article reviews a selection of suitable state‐of‐the‐art analytical methods for different scales of spatial resolution and detection of lithium for a variety of lithium‐bearing materials along the lithium value chain. The various materials differ greatly in terms of their lithium content by more than 5 orders of magnitude and also vary in their ...
Nico Kropp, Ralf Halama, Ralf B. Wehrspohn   +2 more
wiley   +1 more source

Density waves and star formation in grand design spirals

, 2013
HII regions in the arms of spiral galaxies are indicators of recent star-forming processes. They may have been caused by the passage of the density wave or simply created by other means near the arms.
Bongiovanni, Á., Castañeda, H., Cedrés, B., Cepa, J., Sáchez-Portal, M., Tomita, A   +5 more
core   +1 more source

Spiral arm amplitude variations and pattern speeds in the grand design galaxies M51, M81, and M100

The Astrophysical Journal, 1989
In the modal theory of galactic spiral structure, the amplitude of a prominent two-arm spiral pattern should oscillate slightly with galactocentric distance because of an interference between the outward and inward propagating waves. In the stellar dynamical theory, the spiral arm amplitudes should oscillate because of differential crowding near and ...
Bruce G. Elmegreen, Philip E. Seiden, Debra Meloy Elmegreen   +2 more
openaire   +1 more source