Results 61 to 70 of about 3,849,349 (342)

Imprints of galaxy evolution on H ii regions Memory of the past uncovered by the CALIFA survey

, 2014
H ii regions in galaxies are the sites of star formation and thus particular places to understand the build-up of stellar mass in the universe. The line ratios of this ionized gas are frequently used to characterize the ionization conditions.
Bekeraite, S., Bland-Hawthorn, J., Bomans, D., collaboration, The CALIFA, de Lorenzo-Cáceres, A., Delgado, R. González, Díaz, A., Ellis, S., Galbany, L., García-Benito, R., Iglesias-Páramo, J., Kehrig, C., Lopez-Sanchez, A. R., Marino, R. A., Mast, D., Mendez-Abreu, J., Mendoza, M. A., Miralles-Caballero, D., Mollá, M., Monreal-Ibero, A., Papaderos, P., Pasquali, A., Perez, E., Rosales-Ortega, F. F., Roth, M. M., Sanchez, S. F., Sánchez-Menguiano, L., van de Ven, G., Wisotzki, L., Ziegler, B.   +29 more
core   +1 more source

PNe and H II regions in the starburst irregular galaxy NGC 4449 from LBT MODS data [PDF]

, 2017
We present deep 3500$-$10000 $\AA$ spectra of H II regions and planetary nebulae (PNe) in the starburst irregular galaxy NGC 4449, acquired with the Multi Object Double Spectrograph at the Large Binocular Telescope.
Aloisi, A., Annibali, F., Buzzoni, A., Cusano, F., Fumana, M., Marchetti, A., Mignoli, M., Pasquali, A., Romano, D., Tosi, M.   +9 more
core   +2 more sources

Reciprocal control of viral infection and phosphoinositide dynamics

FEBS Letters, EarlyView.
Phosphoinositides, although scarce, regulate key cellular processes, including membrane dynamics and signaling. Viruses exploit these lipids to support their entry, replication, assembly, and egress. The central role of phosphoinositides in infection highlights phosphoinositide metabolism as a promising antiviral target.
Marie Déborah Bancilhon, Bruno Mesmin
wiley   +1 more source

Investigating the Drivers of Electron Temperature Variations in H ii Regions with Keck-KCWI and VLT-MUSE

The Astrophysical Journal
H ii region electron temperatures are a critical ingredient in metallicity determinations, and recent observations have revealed systematic variations in the temperatures measured using different ions.
Ryan J. Rickards Vaught, Karin M. Sandstrom, Francesco Belfiore, Kathryn Kreckel, J. Eduardo Méndez-Delgado, Eric Emsellem, Brent Groves, Guillermo A. Blanc, Daniel A. Dale, Oleg V. Egorov, Simon C. O. Glover, Kathryn Grasha, Ralf S. Klessen, Justus Neumann, Thomas G. Williams   +14 more
doaj   +1 more source

The Ionizing Spectra of Extremely Metal-poor O Stars: Constraints from the Only H ii Region in Leo P

The Astrophysical Journal, 2023
Metal-poor, star-forming dwarf galaxies produce extreme nebular emission and likely played a major role in cosmic reionization. Yet, determining their contribution to the high-redshift ionizing photon budget is hampered by the lack of observations ...
O. Grace Telford, Kristen B. W. McQuinn, John Chisholm, Danielle A. Berg   +3 more
doaj   +1 more source

Resolving the electron temperature discrepancies in HII Regions and Planetary Nebulae: kappa-distributed electrons [PDF]

, 2012
The measurement of electron temperatures and metallicities in H ii regions and Planetary Nebulae (PNe) has-for several decades-presented a problem: results obtained using different techniques disagree. What it worse, they disagree consistently.
Dopita, Michael A., Nicholls, David C., Sutherland, Ralph S.   +2 more
core   +2 more sources

Photosynthesis under far‐red light—evolutionary adaptations and bioengineering of light‐harvesting complexes

FEBS Letters, EarlyView.
Phototrophs evolved light‐harvesting systems adapted for efficient photon capture in habitats enriched in far‐red radiation. A subset of eukaryotic pigment‐binding proteins can absorb far‐red photons via low‐energy chlorophyll states known as red forms.
Antonello Amelii, Edoardo Andrea Cutolo, Daniele Montepietra, Claudia Battarra, Roberto Caferri, Stefano Capaldi, Zeno Guardini, Luca Dall'Osto, Roberto Bassi   +8 more
wiley   +1 more source

The Metallicity–Electron Temperature Relationship in H ii Regions

The Astrophysical Journal
H ii region heavy-element abundances throughout the Galactic disk provide important constraints to theories of the formation and evolution of the Milky Way.
Dana S. Balser, Trey V. Wenger
doaj   +1 more source

The Oxygen Abundance in the Solar Neighborhood

, 2011
We present a homogeneous analysis of the oxygen abundance in five H II regions and eight planetary nebulae (PNe) located at distances lower than 2 kpc and with available spectra of high quality.
Ciardullo, Delgado-Inglada, García-Rojas, Guzmán, Harris, Henney, Jenkins, Kingsburgh, Liu, Mesa-Delgado, Palen, Peimbert, Peimbert, Przybilla, Rodríguez, Rodríguez, Sharpee, Sharpee, Stasińska, Storey, Torres-Peimbert, Whittet   +21 more
core   +1 more source

Spatiotemporal and quantitative analyses of phosphoinositides – fluorescent probe—and mass spectrometry‐based approaches

FEBS Letters, EarlyView.
Fluorescent probes allow dynamic visualization of phosphoinositides in living cells (left), whereas mass spectrometry provides high‐sensitivity, isomer‐resolved quantitation (right). Their synergistic use captures complementary aspects of lipid signaling. This review illustrates how these approaches reveal the spatiotemporal regulation and quantitative
Hiroaki Kajiho, Shin Morioka, Junko Sasaki, Takehiko Sasaki   +3 more
wiley   +1 more source