Results 101 to 110 of about 130,683 (338)

The Caenorhabditis elegans DPF‐3 and human DPP4 have tripeptidyl peptidase activity

FEBS Letters, EarlyView.
The dipeptidyl peptidase IV (DPPIV) family comprises serine proteases classically defined by their ability to remove dipeptides from the N‐termini of substrates, a feature that gave the family its name. Here, we report the discovery of a previously unrecognized tripeptidyl peptidase activity in DPPIV family members from two different species.
Aditya Trivedi, Rajani Kanth Gudipati
wiley   +1 more source

Observational Signatures of the First Stars

, 2001
At present, there are several feasible observational probes of the first stars in the universe. Here, we examine the constraints on early stellar activity from the metallicity of the high-redshift Ly-$\alpha$ clouds, from the effects of stellar ionizing ...
Truran, James W., Venkatesan, Aparna
core   +2 more sources

Relations of Rotation and Chromospheric Activity to Stellar Age for FGK Dwarfs from Kepler and LAMOST

The Astrophysical Journal Supplement Series
The empirical relations between rotation period, chromospheric activity, and age can be used to estimate stellar age. To calibrate these relations, we present a catalog, including the masses and ages of 52,321 FGK dwarfs, 47,489 chromospheric activity ...
Lifei Ye, Shaolan Bi, Jinghua Zhang, Tiancheng Sun, Liu Long, Zhishuai Ge, Tanda Li, Xianfei Zhang, Xunzhou Chen, Yaguang Li, Jianzhao Zhou, Maosheng Xiang   +11 more
doaj   +1 more source

Stellar magnetic activity – Star-Planet Interactions

EPJ Web of Conferences, 2015
Stellar magnetic activity is an important factor in the formation and evolution of exoplanets. Magnetic phenomena like stellar flares, coronal mass ejections, and high-energy emission affect the exoplanetary atmosphere and its mass loss over time.
Poppenhaeger, K.
doaj   +1 more source

The role and implications of mammalian cellular circadian entrainment

FEBS Letters, EarlyView.
At their most fundamental level, mammalian circadian rhythms occur inside every individual cell. To tell the correct time, cells must align (or ‘entrain’) their circadian rhythm to the external environment. In this review, we highlight how cells entrain to the major circadian cues of light, feeding and temperature, and the implications this has for our
Priya Crosby
wiley   +1 more source

TESS Asteroseismology of β Hydri: A Subgiant with a Born-again Dynamo

The Astrophysical Journal
The solar-type subgiant β Hyi has long been studied as an old analog of the Sun. Although the rotation period has never been measured directly, it was estimated to be near 27 days.
Travis S. Metcalfe, Jennifer L. van Saders, Daniel Huber, Derek Buzasi, Rafael A. García, Keivan G. Stassun, Sarbani Basu, Sylvain N. Breton, Zachary R. Claytor, Enrico Corsaro, Martin B. Nielsen, J. M. Joel Ong, Nicholas Saunders, Amalie Stokholm, Timothy R. Bedding   +14 more
doaj   +1 more source

Molecular bases of circadian magnesium rhythms across eukaryotes

FEBS Letters, EarlyView.
Circadian rhythms in intracellular [Mg2+] exist across eukaryotic kingdoms. Central roles for Mg2+ in metabolism suggest that Mg2+ rhythms could regulate daily cellular energy and metabolism. In this Perspective paper, we propose that ancestral prokaryotic transport proteins could be responsible for mediating Mg2+ rhythms and posit a feedback model ...
Helen K. Feord, Gerben van Ooijen
wiley   +1 more source

Galaxy Assembly Bias on the Red Sequence

, 2009
Using samples drawn from the Sloan Digital Sky Survey, we study the relationship between local galaxy density and the properties of galaxies on the red sequence.
Aaronson, Adelman-McCarthy, Anna Gallazzi, Baldry, Balogh, Bell, Bell, Bell, Berlind, Bernardi, Bernardi, Biviano, Blanton, Blanton, Blanton, Blanton, Blanton, Bouché, Bruzual, Bundy, Burbidge, Caldwell, Capak, Carter, Cavaliere, Chabrier, Chapman, Clemens, Clemens, Coil, Cole, Cooper, Cooper, Cooper, Cooper, Cooper, Cooper, Croton, Daddi, Daddi, Davies, Davis, Djorgovski, Dressler, Dressler, Driver, Efstathiou, Faber, Faber, Ferreras, Gallazzi, Gallazzi, Gallazzi, Gao, Gebhardt, Gerhard, Gerke, Graves, Gray, Greggio, Greggio, Gunn, Guzman, Haines, Hester, Hogg, Hogg, Hogg, Ideue, Jeffrey A. Newman, Jorgensen, Kaastra, Kaiser, Kauffmann, Kauffmann, Kuntschner, Kuntschner, Labbé, Longhetti, Lotz, Maller, Mann, Mannucci, Matković, McIntosh, Mehlert, Mellier, Michael C. Cooper, Michielsen, Mo, Moore, Moore, Moore, Moran, Nelan, Neumann, Neumann, Norberg, Oke, Padilla, Papovich, Poggianti, Press, Quadri, Quadri, Renbin Yan, Rix, Rogers, Rose, Sand, Sanders, Sharon, Sheth, Sheth, Smith, Smith, Smith, Spolaor, Strateva, Stutz, Sullivan, Sánchez-Blázquez, Sánchez-Blázquez, Tacconi, Terlevich, Thomas, Thomas, Trager, Trager, Trager, Trager, Tremonti, Treu, van der Wel, van Dokkum, van Dokkum, van Dokkum, Wall, Wang, Weiner, Wetzel, Willmer, Wolf, Worthey, Wu, Yan, Yang, York, Yungelson, Zehavi   +149 more
core   +1 more source

The California Legacy Survey. VI. The Fate of Activity Cycles in Sun-like Stars

The Astronomical Journal
We analyze the spectra of 91 solar-type G- and K-type main-sequence dwarfs in the solar neighborhood to assess activity trends with stellar properties.
Howard Isaacson, Stephen R. Kane, Brad Carter, Andrew W. Howard   +3 more
doaj   +1 more source

Crosstalk between the ribosome quality control‐associated E3 ubiquitin ligases LTN1 and RNF10

FEBS Letters, EarlyView.
Loss of the E3 ligase LTN1, the ubiquitin‐like modifier UFM1, or the deubiquitinating enzyme UFSP2 disrupts endoplasmic reticulum–ribosome quality control (ER‐RQC), a pathway that removes stalled ribosomes and faulty proteins. This disruption may trigger a compensatory response to ER‐RQC defects, including increased expression of the E3 ligase RNF10 ...
Yuxi Huang, Satoshi Hashimoto, Sota Ito, Chisato Kikuguchi, Miho Hoshi, Kiyoshi Yamaguchi, Yoichi Furukawa, Toru Suzuki, Toshifumi Inada   +8 more
wiley   +1 more source