Results 51 to 60 of about 612,500 (304)

BBN and the Primordial Abundances

, 2005
The relic abundances of the light elements synthesized during the first few minutes of the evolution of the Universe provide unique probes of cosmology and the building blocks for stellar and galactic chemical evolution, while also enabling constraints ...
C. Chiappini, D. Kirkman, D.N. Spergel, G. Steigman, G. Steigman, I. Iben, J. Lequeux, J. Melendez, J.A. Thorburn, J.N. Bahcall, J.P. Kneller, K.A. Olive, L. Randall, M. Kawasaki, M.H. Pinsonneault, P. Bonifacio, R.T. Rood, S. Cassisi, S.G. Ryan, S.M. Viegas, T.M. Bania, V. Barger   +21 more
core   +2 more sources

Abundances in planetary nebulae: NGC1535, NGC6629, He2-108, and Tc1 [PDF]

, 2011
The aim of the paper is to determine abundances in a group of PNe with uniform morphology. The PNe discussed are circular excited by rather low-temperature central stars. The relation between abundance and evolution is discussed. The mid-infrared spectra
Adams, Aller, Aller, Aller, Banerjee, Barker, Benjamin, Bernard Salas, Blocker, Cahn, Cami, Ciardullo, Condon, Corradi, Davey, de Freitas Pacheco, Feibelman, Fluks, Gathier, Gathier, Gregory, Grevesse, Griffith, Guerrero, Guiles, Henry, Herald, Higdon, Houck, Hummer, J. Bernard-Salas, Kerber, Kingsburgh, Kingsburgh, Krabbe, McKenna, Mendez, Mendez, Milingo, Milingo, Milingo, Milne, Milne, Napiwotzki, Pauldrach, Peimbert, Peimbert, Peimbert, Phillips, Porter, Pottasch, Pottasch, Pottasch, Pottasch, Pottasch, Pottasch, Pottasch, Pottasch, Pottasch, Preite-Martinez, R. Surendiranath, Rauch, S. R. Pottasch, Schwarz, Stanghellini, Stoy, Surendiranath, Torres-Peimbert, Tylenda, Weidemann, Williams, Wright   +71 more
core   +4 more sources

By dawn or dusk—how circadian timing rewrites bacterial infection outcomes

FEBS Letters, EarlyView.
The circadian clock shapes immune function, yet its influence on infection outcomes is only beginning to be understood. This review highlights how circadian timing alters host responses to the bacterial pathogens Salmonella enterica, Listeria monocytogenes, and Streptococcus pneumoniae revealing that the effectiveness of immune defense depends not only
Devons Mo, Catherine S. Palmer, Jacqueline M. Kimmey   +2 more
wiley   +1 more source

The Metallicity and Distance of Leo A from Blue Supergiants

The Astrophysical Journal, 2023
We have obtained high-quality spectra of blue supergiant candidates in the dwarf irregular galaxy Leo A with the Low Resolution Imaging Spectrometer at the Keck I telescope.
Miguel A. Urbaneja, Fabio Bresolin, Rolf-Peter Kudritzki   +2 more
doaj   +1 more source

Planetary nebulae in the inner Milky Way: new abundances [PDF]

, 2009
The study of planetary nebulae in the inner-disk and bulge gives important information on the chemical abundances of elements such as He, N, O, Ar, Ne, and on the evolution of these abundances, which is associated with the evolution of intermediate-mass ...
Cavichia, O., Costa, R. D. D., Maciel, W. J.   +2 more
core   +2 more sources

"Counterpart" method for abundance determinations in HII regions

, 2012
We suggest a new way of the determining abundances and electron temperatures in HII regions from strong emission lines. Our approach is based on the standard assumption that HII regions with similar intensities of strong emission lines have similar ...
Aggarwal, Alloin, Andrievsky, Andrievsky, Andrievsky, Andrievsky, Asplund, Baldwin, Bresolin, Bresolin, Bresolin, Bresolin, Bresolin, Bresolin, Bresolin, Campbell, Castellanos, Cid, de Blok, Dopita, Dufour, E. K. Grebel, Edlén, Esteban, Esteban, Ferguson, Fierro, French, Fricke, Froese, Galavís, García-Rojas, García-Rojas, García-Rojas, García-Rojas, Garnett, Garnett, Garnett, Goddard, González-Delgado, Guseva, Guseva, Guseva, Guseva, Guseva, Guseva, Guseva, Hawley, Henry, Hodge, Hudson, Hägele, Izotov, Izotov, Izotov, Izotov, Izotov, Izotov, Izotov, Izotov, Izotov, Izotov, Izotov, Izotov, Johansson, Kauffmann, Kehrig, Kehrig, Kennicutt, Kennicutt, Kewley, Kewley, Kewley, Kinkel, Kniazev, Kniazev, Kobulnicky, Kobulnicky, Kunth, Kwitter, L. Mattsson, L. S. Pilyugin, Lee, Lee, Lee, Lee, Lequeux, Luridiana, López-Sánchez, López-Sánchez, López-Sánchez, López-Sánchez, López-Sánchez, Maeder, Magrini, Mattsson, McCall, McGaugh, Melbourne, Melnick, Mendoza, Miller, Moustakas, Noeske, Pagel, Pagel, Pagel, Pagel, Pastoriza, Peimbert, Peimbert, Peimbert, Peimbert, Peimbert, Pettini, Peña, Peña-Guerrero, Pilyugin, Pilyugin, Pilyugin, Pilyugin, Pilyugin, Pilyugin, Pilyugin, Pilyugin, Pilyugin, Pilyugin, Pilyugin, Pilyugin, Popescu, Pradhan, Pustilnik, Pustilnik, Pustilnik, Pustilnik, Pustilnik, Pérez-Montero, Rayo, Rodríguez, Saviane, Sedwick, Skillman, Skillman, Skillman, Stanghellini, Stasińska, Stasińska, Stasińska, Stasińska, Storey, Tayal, Terlevich, Thuan, Thuan, Thuan, Torres-Peimbert, Tremonti, Tsamis, Tüllmann, van den, van Zee, van Zee, van Zee, van Zee, van Zee, Vila Costas, Vílchez, Vílchez, Webster, Wenåker, Williams, Yin, York, Zahid, Zaritsky, Zaritsky   +175 more
core   +1 more source

Planetary nebulae in the inner Milky Way [PDF]

, 2009
New abundances of planetary nebulae located towards the bulge of the Galaxy are derived based on observations made at LNA (Brazil). We present accurate abundances of the elements He, N, S, O, Ar, and Ne for 56 PNe located towards the galactic bulge.
Chiappini, Costa, Cuisinier, Escudero, Oscar Cavichia, Roberto D. D. Costa, Smartt, Walter J. Maciel   +7 more
core   +1 more source

Hematopoietic (stem) cells—The elixir of life?

FEBS Letters, EarlyView.
The aging of HSCs (hematopoietic stem cells) and the blood system leads to the decline of other organs. Rejuvenating aged HSCs improves the function of the blood system, slowing the aging of the heart, kidney, brain, and liver, and the occurrence of age‐related diseases.
Emilie L. Cerezo, Jonah Anderson, Emilie Dinh Vedrenne, Noël Yeh Martín, Jette Lengefeld   +4 more
wiley   +1 more source

The Oxygen Abundance of Nearby Galaxies from Sloan Digital Sky Survey Spectra

, 2007
We have derived the oxygen abundance for a sample of nearby galaxies in the Data Release 5 of the Sloan Digital Sky Survey (SDSS) which possess at least two independent spectra of one or several HII regions with a detected [OIII]4363 auroral line. Since,
Campbell A., Edmunds M. G., Kinkel U., Leonid S. Pilyugin, Luridiana V., Pagel B. E. J., Pagel B. E. J., Pagel B. E. J., Pilyugin L. S., Pilyugin L. S., Trinh X. Thuan   +10 more
core   +1 more source

Structural insights into lacto‐N‐biose I recognition by a family 32 carbohydrate‐binding module from Bifidobacterium bifidum

FEBS Letters, EarlyView.
Bifidobacterium bifidum establishes symbiosis with infants by metabolizing lacto‐N‐biose I (LNB) from human milk oligosaccharides (HMOs). The extracellular multidomain enzyme LnbB drives this process, releasing LNB via its catalytic glycoside hydrolase family 20 (GH20) lacto‐N‐biosidase domain.
Xinzhe Zhang, Naoki Sunagawa, Toma Kashima, Kiyohiko Igarashi, Akimasa Miyanaga, Shinya Fushinobu   +5 more
wiley   +1 more source