Results 111 to 120 of about 11,728,534 (352)

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

Implications of the Intriguing Constant Inner Mass Surface Density Observed in Dark Matter Halos

Galaxies
It has long been known that the observed mass surface density of cored dark matter (DM) halos is approximately constant, independently of the galaxy mass (i.e., ρcrc≃constant, with ρc and rc being the central volume density and the radius of the core ...
Jorge Sánchez Almeida
doaj   +1 more source

Environmental dependence of stellar velocity dispersion in the Main galaxy sample of SDSS DR10

Open Physics, 2014
The aim of this work is to examine the environmental dependence of stellar velocity dispersion in local galaxies. In studies that likely suffer from the radial selection effect, one has a preference for the use of volumelimited samples.
Deng Xin-Fa
doaj   +1 more source

Fundamental Parameters of the Milky Way Galaxy Based on VLBI Astrometry [PDF]

, 2012
We present analyses to determine the fundamental parameters of the Galaxy based on VLBI astrometry of 52 Galactic maser sources obtained with VERA, VLBA, and EVN.
M. Honma, T. Nagayama, K. Ando, T. Bushimata, Y. Choi, T. Handa, T. Hirota, H. Imai, T. Jike, Mi Kyoung Kim, O. Kameya, N. Kawaguchi, H. Kobayashi, T. Kurayama, S. Kuji, N. Matsumoto, S. Manabe, T. Miyaji, K. Motogi, A. Nakagawa, H. Nakanishi, Notaro Niinuma, C. Oh, T. Omodaká, T. Oyama, N. Sakai, Katsuhisa Sato, M. Sato, K. Shibata, Satoshi Shiozaki, K. Sunada, Y. Tamura, Y. Ueno, Aya Yamauchi   +33 more
semanticscholar   +1 more source

The evolutionary state and fundamental parameters of metallic A-F giants [PDF]

, 1998
Using Hipparcos parallaxes, we show that the metallic A-F giants found by Hauck (1986) on the basis of their high Delta m_2 index in Geneva photometry are on average more evolved than their non-metallic counterparts.
Erspamer, D., Kuenzli, M., North, P.
core   +1 more source

Peptide‐based ligand antagonists block a Vibrio cholerae adhesin

FEBS Letters, EarlyView.
The structure of a peptide‐binding domain of the Vibrio cholerae adhesin FrhA was solved by X‐ray crystallography, revealing how the inhibitory peptide AGYTD binds tightly at its Ca2+‐coordinated pocket. Structure‐guided design incorporating D‐amino acids enhanced binding affinity, providing a foundation for developing anti‐adhesion therapeutics ...
Mingyu Wang, Grace Du, Charity Yongo‐Luwawa, Angelina Lu, Brett Kinrade, Kim Munro, Karl E. Klose, William D. Lubell, Peter Davies, Shuaiqi Guo   +9 more
wiley   +1 more source

Fundamental stellar and accretion disc parameters of the eclipsing binary DQ Velorum

, 2013
To add to the growing collection of well-studied double periodic variables (DPVs) we have carried out the first spectroscopic and photometric analysis of the eclipsing binary DQ Velorum to obtain its main physical stellar and orbital parameters ...
Barría, D., Djurasević, G., Kołaczkowski, Z., Mennickent, R. E., Michalska, G., Niemczura, E., Schmidtobreick, L., Vucković, M.   +7 more
core   +1 more source

Real‐time assay of ribonucleotide reductase activity with a fluorescent RNA aptamer

FEBS Letters, EarlyView.
Ribonucleotide reductases (RNR) synthesize DNA building blocks de novo, making them crucial in DNA replication and drug targeting. FLARE introduces the first single‐tube real‐time coupled RNR assay, which enables isothermal tracking of RNR activity at nanomolar enzyme levels and allows the reconstruction of allosteric regulatory patterns and rapid ...
Jacopo De Capitani, Noemi E. Nwosu, Viktoria Gocke, Müge Kasanmascheff, Hannes Mutschler   +4 more
wiley   +1 more source

Estimation of Physical Stellar Parameters from Spectral Models Using Deep Learning Techniques

Mathematics
This article presents a new algorithm that uses techniques from the field of artificial intelligence to automatically estimate the physical parameters of massive stars from a grid of stellar spectral models.
Esteban Olivares, Michel Curé, Ignacio Araya, Ernesto Fabregas, Catalina Arcos, Natalia Machuca, Gonzalo Farias   +6 more
doaj   +1 more source

Spectral Analysis Via the Virtual Observatory: The Service Theossa

Open Astronomy, 2012
In the framework of the Virtual Observatory, the newly developed service TheoSSA provides access to theoretical stellar spectral energy distributions. In a pilot phase, this service is based on the well-established Tübingen NLTE Model-Atmosphere Package ...
Ringat E., Rauch T., Werner K.
doaj   +1 more source