Results 81 to 90 of about 1,069,925 (330)

KiDS-1000: Combined halo-model cosmology constraints from galaxy abundance, galaxy clustering, and galaxy-galaxy lensing

Astronomy & Astrophysics, 2023
We present constraints on the flat Λ cold dark matter cosmological model through a joint analysis of galaxy abundance, galaxy clustering, and galaxy-galaxy lensing observables with the Kilo-Degree Survey. Our theoretical model combines a flexible conditional stellar mass function, which describes the galaxy-halo connection, with a cosmological N-body ...
Andrej Dvornik, Catherine Heymans, Marika Asgari, Constance Mahony, Benjamin Joachimi, Maciej Bilicki, Elisa Chisari, Hendrik Hildebrandt, Henk Hoekstra, Harry Johnston, Konrad Kuijken, Alexander Mead, Hironao Miyatake, Takahiro Nishimichi, Robert Reischke, Sandra Unruh, Angus H. Wright   +16 more
openaire   +7 more sources

Subterranean environments contribute to three‐quarters of classified ecosystem services

Biological Reviews, EarlyView.
ABSTRACT Beneath the Earth's surface lies a network of interconnected caves, voids, and systems of fissures forming in rocks of sedimentary, igneous, or metamorphic origin. Although largely inaccessible to humans, this hidden realm supports and regulates services critical to ecological health and human well‐being.
Stefano Mammola, David Brankovits, Tiziana Di Lorenzo, Isabel R. Amorim, Raluca Ioana Bancila, Adrià Bellvert, Enrico Bernard, Anna Blomberg, Paulo A.V. Borges, Martina Cappelletti, Rodrigo Lopes Ferreira, Rosalina Gabriel, Diana M. P. Galassi, Laura Garzoli, Vasilis Gerovasileiou, Grant C. Hose, Kathryn L. Korbel, Simone Martino, Ana Z Miller, Nataša Mori, Veronica Nanni, Giuseppe Nicolosi, Mattia Saccò, Troy S. Sakihara, Marconi Souza Silva, Anne E. Tamalavage, Maja Zagmajster, Efraín Chávez, Christian Griebler, Pedro Cardoso, Alejandro Martínez   +30 more
wiley   +1 more source

Chlorinated Paracyclophanes: Composition Analysis and Direct Metal‐Free Alkylation with n‐BuLi

European Journal of Organic Chemistry, EarlyView.
A transition‐metal‐free alkylation of pseudo‐para dichloro[2.2]paracyclophane (Cl2‐PCP) is reported, utilizing the purified pseudo‐para isomer and n‐butyllithium (BuLi). Optimization with the chelating agent TMEDA and refluxing n‐heptane significantly boosted selectivity and reaction rate, providing the dialkylated product in 22% isolated yield.
Davide Frigatti, Alessandro Scarso, Stefan Bräse, Fabrizio Fabris   +3 more
wiley   +1 more source

The Hubble Constant Anchor Galaxy NGC 4258: Metallicity and Distance from Blue Supergiants

The Astrophysical Journal
A quantitative spectroscopic study of blue supergiant stars in the Hubble constant anchor galaxy NGC 4258 is presented. The non-LTE analysis of Keck I telescope LRIS spectra yields a central logarithmic metallicity (in units of the solar value) of [ Z ] =
Rolf-Peter Kudritzki, Miguel A. Urbaneja, Fabio Bresolin, Lucas M. Macri, Wenlong Yuan, Siyang Li, Gagandeep S. Anand, Adam G. Riess   +7 more
doaj   +1 more source

Arbuscular mycorrhizal fungal community abundance, functions, and symbiotic interactions revealed by root metatranscriptomes

iMetaOmics, EarlyView.
Paradigm shift: PCR‐free methods reveal 6–15‐fold higher arbuscular mycorrhizal (AM) fungal abundance than metabarcoding, exposing systematic underestimation across decades of research. Predictive power: AM fungal abundance serves as a community‐level trait that predicts crop yield under drought conditions.
Peilin Chen, John W. Taylor, Cheng Gao
wiley   +1 more source

Oxygen and Nitrogen in Leo A and GR 8

, 2005
We present elemental abundances for multiple HII regions in Leo A and GR 8 obtained from long slit optical spectroscopy of these two nearby low luminosity dwarf irregular galaxies.
De Robertis M. M., Evan D. Skillman, Gathier R., Heydari-Malayeri M., Howarth I. D., Hummer D. G., Lambert D. L., Legrand F., Liese van Zee, Maddox S. J., Martha P. Haynes, Masegosa J., Moles M., Olofsson K., Pagel B. E. J., Pagel B. E. J., Peimbert M., Pilyugin L. S., Ronnback J., Seaton M. J., Skillman E. D., Skillman E. D., Stasinska G., Webster B. L., Zijlstra A. A.   +24 more
core   +1 more source

Tracing chemical evolution over the extent of the Milky Way's Disk with APOGEE Red Clump Stars [PDF]

, 2014
We employ the first two years of data from the near-infrared, high-resolution SDSS-III/APOGEE spectroscopic survey to investigate the distribution of metallicity and alpha-element abundances of stars over a large part of the Milky Way disk.
Anders, Friedrich, Andrews, Brett H., Beers, Timothy C., Bird, Jonathan C., Bizyaev, Dmitry, Bovy, Jo, Brewington, Howard, Chiappini, Cristina, Cunha, Katia, Ebelke, Garrett, Feuillet, Diane, Frinchaboy, Peter M., Garcia-Hernandez, D. A., Ge, Jian, Hayden, Michael, Holtzman, Jon, Johnson, Jennifer A., Kinemuchi, Karen, Majewski, Steven R., Malanushenko, Elena, Malanushenko, Viktor, Marchante, Moses, Meszaros, Szabolcs, Minchev, Ivan, Nidever, David L., O'Connell, Robert W., Oravetz, Daniel, Pan, Kaike, Perez, Ana E. Garcia, Prieto, Carlos Allende, Rix, Hans-Walter, Robin, Annie C., Schiavon, Ricardo P., Schneider, Donald P., Shetrone, Matthew, Simmons, Audrey, Skrutskie, Michael F., Smith, Verne, Sobeck, Jennifer, Weinberg, David H., Wilson, John C., Zamora, O., Zasowski, Gail   +42 more
core   +3 more sources

Nebular abundances of nearby southern dwarf galaxies [PDF]

Astronomy & Astrophysics, 2003
The results of optical spectroscopy of H II regions in a sample of southern dwarf irregulars consisting of five dwarf galaxies in the Centaurus A group, four dwarfs in the Sculptor group, and eight additional dwarf galaxies are presented. Oxygen abundances are derived using the direct method where [O III]4363 is detected; otherwise, abundances are ...
Lee, Henry, Grebel, Eva K., Hodge, Paul
openaire   +2 more sources

Ginseng polysaccharides prevent mastitis through Lactobacillus murinus‐derived deoxycholic acid and TGR5 signaling

iMetaOmics, EarlyView.
Prebiotic Ginseng polysaccharides (GP) alleviate mastitis through selective enrichment of gut L. murinus, which elevates its anti‐inflammatory metabolite deoxycholic acid (DCA). Circulating DCA engages mammary epithelial TGR5 receptors, triggering the cAMP–PKA pathway to suppress NF‐κB/NLRP3‐mediated inflammation.
Zhijie Zheng, Huiying Liu, Sizhe Chen, Jianhui Gu, Sisi Cai, Xiang Liu, Raphaela I. Lau, Yao Zhang, Sunjae Lee, Xiaoyan Wang, Kewei Fan, Xiaole Yin, Hein Min Tun, Renyou Gan, Haichong Wu, Qi Su   +15 more
wiley   +1 more source

Exploring the Gas-phase Metallicity Gradients of Star-forming Galaxies at Cosmic Noon

The Astrophysical Journal
We explore the relationships between the [O/H] gas-phase metallicity radial gradients and multiple galaxy properties for 238 star-forming galaxies at 0.6 < z < 2.6 selected from the CANDELS Ly α Emission at Reionization survey with stellar mass $8.5\lt ...
Yingjie Cheng, Mauro Giavalisco, Raymond C. Simons, Zhiyuan Ji, Darren Stroupe, Nikko J. Cleri   +5 more
doaj   +1 more source