Results 101 to 110 of about 563,854 (280)

A Study of Abundance Patterns in the Sextans and Sculptor Dwarf Spheroidal Galaxies

The Astrophysical Journal
In this work, we employ a multicomponent decomposition model to study the Sextans and Sculptor dwarf spheroidal galaxies, which have distinct evolutionary histories.
Shuaishuai Yang, Shichao Zhang, Lu Zhang, Hongjie Li   +3 more
doaj   +1 more source

The status of Galactic field lambda Bootis stars in the post-Hipparcos era

, 2002
The lambda Bootis stars are Population I, late B to early F-type stars, with moderate to extreme (up to a factor 100) surface underabundances of most Fe-peak elements and solar abundances of lighter elements (C, N, O, and S).
Barzova, Ina S., Iliev, Ilian Kh., Kamp, Inga, Paunzen, Ernst   +3 more
core   +1 more source

Protein pyrophosphorylation by inositol pyrophosphates — detection, function, and regulation

FEBS Letters, EarlyView.
Protein pyrophosphorylation is an unusual signaling mechanism that was discovered two decades ago. It can be driven by inositol pyrophosphate messengers and influences various cellular processes. Herein, we summarize the research progress and challenges of this field, covering pathways found to be regulated by this posttranslational modification as ...
Sarah Lampe, Tanmay Kumar Mohanty, Rashna Bhandari, Dorothea Fiedler   +3 more
wiley   +1 more source

Function‐driven design of a surrogate interleukin‐2 receptor ligand

FEBS Letters, EarlyView.
Interleukin (IL)‐2 signaling can be achieved and precisely fine‐tuned through the affinity, distance, and orientation of the heterodimeric receptors with their ligands. We designed a biased IL‐2 surrogate ligand that selectively promotes effector T and natural killer cell activation and differentiation. Interleukin (IL) receptors play a pivotal role in
Ziwei Tang, Zelin Cheng, Teng Li, Fulian Wang, Liangminghui Zhang, Xiuxiu He, Lili Liu, Wei Wang, Aibin Liang, Guang Yang   +9 more
wiley   +1 more source

First Observation of the Complete Rotation Period of the Ultraslowly Rotating Magnetic O Star HD 54879

The Astrophysical Journal
HD 54879 is the most recently discovered magnetic O-type star. Previous studies ruled out a rotation period shorter than 7 yr, implying that HD 54879 is the second most slowly rotating known magnetic O-type star.
C. Erba, C. P. Folsom, A. David-Uraz, G. A. Wade, S. Seadrow, S. Bellotti, L. Fossati, V. Petit, M. E. Shultz   +8 more
doaj   +1 more source

Chandra X-ray observation of the young stellar cluster NGC 3293 in the Carina Nebula Complex

, 2017
We characterize the stellar population of the poorly explored young stellar cluster NGC 3293 at the northwestern periphery of the Carina Nebula Complex, in order to evaluate the cluster age and the mass function, and to test claims of an abnormal IMF and
Broos, P., Flaischlen, S., Gaczkowski, B., Preibisch, T., Townsley, L.   +4 more
core   +1 more source

Time after time – circadian clocks through the lens of oscillator theory

FEBS Letters, EarlyView.
Oscillator theory bridges physics and circadian biology. Damped oscillators require external drivers, while limit cycles emerge from delayed feedback and nonlinearities. Coupling enables tissue‐level coherence, and entrainment aligns internal clocks with environmental cues.
Marta del Olmo, Carolin Ector, Hanspeter Herzel   +2 more
wiley   +1 more source

Analysis of Balmer Profiles of early type stars [PDF]

, 2000
The spectral energy distribution (SED) of recent star formation regions is dominated by the more massive and early stars (O and B types). These stars show large and very significant absorption features, the most prominent being the recombination lines of
Alvarez, Mar Alvarez, Delgado, Rosa Gonzalez, Diaz, Angeles I., Molla, Mercedes   +3 more
core  

Dust discs around intermediate mass and Sun-like stars in the 16 Myr old NGC 1960 open cluster

, 2011
We present an analysis of Spitzer IRAC (3.6--8um) and MIPS (24um) imaging of members of the 16(+10/-5)Myr old open cluster NGC 1960 (M36). Models of terrestrial planet formation indicate that rocky planets are likely to achieve their final masses at ...
Abt, Abt, Alonso, Bryden, Canup, Carpenter, Carpenter, Chen, Chen, Chen, Cieza, Cox, Currie, Currie, Currie, Dominik, Duchêne, Duquennoy, Engelbracht, Fazio, Feigelson, Flaherty, Gehrels, Gorlova, Gorlova, Grigorieva, Hartmann, Hasan, Hernández, Hernández, Hernández, Hernández, Hernández, Hillenbrand, Jeffries, Jeffries, Kenyon, Kenyon, Kenyon, Kenyon, Klahr, Kroupa, Lagrange, LaValley, Lefèvre, Magnier, Makovoz, Mayne, Moerchen, Muzerolle, Naylor, Plavchan, R. D. Jeffries, R. Smith, Reach, Rebull, Rieke, Rieke, Rieke, Sanner, Siegler, Siess, Skrutskie, Smith, Smith, Stauffer, Su, Trilling, Weidenschilling, Weidenschilling, Wetherill, Wyatt, Wyatt, Yin   +73 more
core   +1 more source

The newfound relationship between extrachromosomal DNAs and excised signal circles

FEBS Letters, EarlyView.
Extrachromosomal DNAs (ecDNAs) contribute to the progression of many human cancers. In addition, circular DNA by‐products of V(D)J recombination, excised signal circles (ESCs), have roles in cancer progression but have largely been overlooked. In this Review, we explore the roles of ecDNAs and ESCs in cancer development, and highlight why these ...
Dylan Casey, Zeqian Gao, Joan Boyes
wiley   +1 more source