Results 61 to 70 of about 63,717 (277)

The far-ultraviolet spectra of two hot PG1159 stars

, 2016
PG1159 stars are hot, hydrogen-deficient (pre-) white dwarfs with atmospheres mainly composed of helium, carbon, and oxygen. The unusual surface chemistry is the result of a late helium-shell flash.
Kruk, J. W., Rauch, T., Werner, K.
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

Primordial Lithium from Globular Cluster Turnoff Stars: M13 and M71

The Astrophysical Journal
During Big Bang nucleosynthesis (BBN) in the first 15 minutes of the Universe, some ^7 Li was created along with isotopes of H and He. The determination of that primordial value of Li can help constrain the conditions at that time.
Ann Merchant Boesgaard, Constantine P. Deliyannis   +1 more
doaj   +1 more source

Selecting a Photometric System for Gaia: C, N, O and Alpha-Process Elements

Open Astronomy, 2003
The sensitivity of stellar spectra to C, N, O and α-process element abundances is discussed with the aim of taking this effect into account when selecting a photometric system for the Gaia orbiting observatory.
Tautvaišienė G., Edvardsson B., Bartašiūtė S.   +2 more
doaj   +1 more source

The halo+cluster system of the Galactic globular cluster NGC1851

, 2014
NGC1851 is surrounded by a stellar component that extends more than ten times beyond the tidal radius. Although the nature of this stellar structure is not known, it has been suggested to be a sparse halo of stars or associated with a stellar stream.
Angeloni, R., Aparicio, A., Asplund, M., Bedin, L. R., Buonanno, R., Cassisi, S., Da Costa, G., Dotter, A., Jerjen, H., Lind, K., Mackey, D., Marino, A. F., Milone, A. P., Monelli, M., Norris, J., Piotto, G., Sbordone, L., Stetson, P. B., Weiss, A., Yong, D.   +19 more
core   +1 more source

The role of histone modifications in transcription regulation upon DNA damage

FEBS Letters, EarlyView.
This review discusses the critical role of histone modifications in regulating gene expression during the DNA damage response (DDR). By modulating chromatin structure and recruiting repair factors, these post‐translational modifications fine‐tune transcriptional programmes to maintain genomic stability.
Angelina Job Kolady, Siyao Wang
wiley   +1 more source

A near field cosmology study of heavy elements in very metal-poor stars

, 2012
Studying a range of old metal-poor stars provides information over cosmological timescales of our Galaxy. Such studies are indicative of the pristine gases and evolution of the Milky Way.
Hansen, Camilla. J.
core   +1 more source

Nicotinamide N‐methyltransferase promotes drug resistance in lung cancer, as revealed by nascent proteomic profiling

Molecular Oncology, EarlyView.
AZD9291 has shown promise in targeted cancer therapy but is limited by resistance. In this study, we employed metabolic labeling and LC–MS/MS to profile time‐resolved nascent protein perturbations, allowing dynamic tracking of drug‐responsive proteins. We demonstrated that increased NNMT expression is associated with drug resistance, highlighting NNMT ...
Zhanwu Hou, Zhen Wang, Fei Yang, Xiao Han, Lei Li, Huadong Liu   +5 more
wiley   +1 more source

The Impact of Initial Composition on Massive Star Evolution and Nucleosynthesis

The Astrophysical Journal
We study the sensitivity of presupernova evolution and supernova nucleosynthesis yields of massive stars to variations of the initial composition. We use the solar abundances from Lodders, and compute two different sets of initial stellar compositions ...
Christopher West, Alexander Heger, Benoit Côté, Lev Serxner, Haoxuan Sun   +4 more
doaj   +1 more source

Satellite abundances around bright isolated galaxies

, 2012
We study satellite galaxy abundances in SDSS by counting photometric galaxies around isolated bright primaries. We present results as a function of the luminosity, stellar mass and colour of the satellites, and of the stellar mass and colour of the ...
Abazajian, Aihara, Alshino, Andreon, Ann, Benson, Berlind, Blanton, Blanton, Bode, Bower, Boylan-Kolchin, Boylan-Kolchin, Boylan-Kolchin, Boylan-Kolchin, Bullock, Capak, Chabrier, Chen, Christlein, Cole, Conroy, Conroy, Conroy, Cooray, Croton, Cunha, de Filippis, De Lucia, De Propris, Driver, Driver, Fall, Font, Goto, Grebel, Grebel, Grebel, Grebel, Guo, Guo, Guo, Hansen, Henriques, Henriques, Holmberg, Jing, Jing, Kang, Kauffmann, Kauffmann, Kauffmann, Kauffmann, Klypin, Koposov, Koposov, Kravtsov, Lacey, Lares, Li, Liu, Lorrimer, Lovell, Ma, Macciò, Mandelbaum, Mandelbaum, Mandelbaum, Montero-Dorta, Moore, Moore, More, Moster, Navarro, Navarro, Nierenberg, Paolillo, Peacock, Phillipps, Popesso, Popesso, Prada, Prescott, Ross, Sales, Sales, Sales, Sargent, Scarlata, Schechter, Scoville, Seljak, Sersic, Simard, Simon, Simon, Simon D. M. White, Skibba, Smith, Somerville, Somerville, Spergel, Spergel, Springel, Springel, Tal, Tal, Tasitsiomi, Tollerud, Tollerud, Vader, Vale, Walsh, Wang, Weinmann, Weinmann, Weinmann, Wenting Wang, Westra, White, White, Willman, Yang, Yang, York, Yoshida, Zandivarez, Zaritsky, Zaritsky, Zavala, Zhao, Zheng   +131 more
core   +1 more source