Results 51 to 60 of about 1,597,523 (296)

Statistical Properties of DLAs and sub-DLAs [PDF]

, 2001
Quasar absorbers provide a powerful observational tool with which to probe both galaxies and the intergalactic medium up to high redshift. We present a study of the evolution of the column density distribution, f(N,z), and total neutral hydrogen mass in ...
Céline Péroux, Francesca Matteucci, Lisa J. Storrie-lombardi, Mike J. Irwin, Richard G. Mcmahon   +4 more
core   +3 more sources

Analytic solution of charge density of single wall carbon nanotube in conditions of field electron emission

, 2006
We derived the analytic solution of induced electrostatic potential along single wall carbon nanotubes. Under the hypothesis of constant density of states in the charge-neutral level, we are able to obtain the linear density of excess charge in an ...
Li Zhi-Bing, Mishchenko E G, Saito R, Wang Wei-Liang   +3 more
core   +1 more source

The neutral hydrogen cosmological mass density atz= 5 [PDF]

Monthly Notices of the Royal Astronomical Society, 2015
AbstractWe present the largest homogeneous survey of redshift > 4.4 damped Lyα systems (DLAs) using the spectra of 163 quasars that comprise the Giant Gemini GMOS (GGG) survey. With this survey we make the most precise high-redshift measurement of the cosmological mass density of neutral hydrogen, ΩHI. After correcting for systematic effects using a
Crighton N. H. M., Murphy M. T., Prochaska J. X., Worseck G., Rafelski M., Becker G. D., Ellison S. L., Fumagalli M., Lopez S., Meiksin A., O'Meara J. M.   +10 more
openaire   +7 more sources

pH‐mediated activation of the lysosomal arginine sensor SLC38A9

FEBS Letters, EarlyView.
Cells monitor nutrient levels via the lysosomal transporter SLC38A9 to activate the mechanistic target of rapamycin complex 1 (mTORC1). This study reveals that SLC38A9 function is regulated by pH. We identified histidine 544 as a critical pH sensor that undergoes conformational changes to control amino acid efflux from lysosomes; therefore, it ...
Xuelang Mu, Ampon Sae Her, Tamir Gonen
wiley   +1 more source

X‐Raying Neutral Density Disturbances in the Mesosphere and Lower Thermosphere Induced by the 2022 Hunga‐Tonga Volcano Eruption‐Explosion

Geophysical Research Letters
We present X‐ray observations of the upper atmospheric density disturbance caused by the explosive eruption of the Hunga Tonga‐Hunga Ha'apai (HTHH) volcano on 15 January 2022.
Satoru Katsuda, Hiroyuki Shinagawa, Hitoshi Fujiwara, Hidekatsu Jin, Yasunobu Miyoshi, Yoshizumi Miyoshi, Yuko Motizuki, Motoki Nakajima, Kazuhiro Nakazawa, Kumiko K. Nobukawa, Yuichi Otsuka, Atsushi Shinbori, Takuya Sori, Chihiro Tao, Makoto S. Tashiro, Yuuki Wada, Takaya Yamawaki   +16 more
doaj   +1 more source

High-resolution 21-cm observations of low-column density gas clumps in the Milky Way halo

, 2009
We study the properties of low-column density gas clumps in the halo of the Milky Way based on high-resolution 21-cm observations. Using interferometric data from the WSRT and the VLA we study HI emission at low-, intermediate- and high radial ...
B. Winkel, Ben Bekhti, Bregman, Brüns, Ding, F. Kenn, Ford, Fraternali, Heiles, Högbom, Kalberla, Kalberla, Lockman, Lockman, Mathewson, Muller, N. Ben Bekhti, Oort, P. Richter, Quilis, Richter, Richter, Richter, Savage, Sembach, Shapiro, Shapiro, Stil, T. Westmeier, Thom, van Woerden, Vogelaar, Wakker, Wakker, Wakker, Wakker, Wakker, Wakker, Wolfire, Yoshizawa   +39 more
core   +1 more source

Crucial parameters for precise copy number variation detection in formalin‐fixed paraffin‐embedded solid cancer samples

Molecular Oncology, EarlyView.
This study shows that copy number variations (CNVs) can be reliably detected in formalin‐fixed paraffin‐embedded (FFPE) solid cancer samples using ultra‐low‐pass whole‐genome sequencing, provided that key (pre)‐analytical parameters are optimized.
Hanne Goris, Vasiliki Siozopoulou, Léon C van Kempen, Anne Sieben, Ella Roelant, Stig Hellemans, Elyne Backx, Laure Sorber, Koen De Winne, Senada Koljenović, Karen Zwaenepoel   +10 more
wiley   +1 more source

Estimates of Spherical Satellite Drag Coefficients in the Upper Thermosphere During Different Geomagnetic Conditions

Space Weather
Satellite drag coefficients are crucial for determining the neutral mass densities that affect spacecraft operations in the thermosphere. Many studies typically utilize a constant drag coefficient of 2.2 to calculate the neutral density.
Xin Wang, Tingling Ren, Ronglan Wang, Bingxian Luo, Ercha Aa, Lei Cai, Ming Li, Juan Miao, Siqing Liu, Jiancun Gong   +9 more
doaj   +1 more source

Pion condensation in electrically neutral cold matter with finite baryon density [PDF]

, 2005
The possibility of the pion condensation phenomenon in cold and electrically neutral dense baryonic matter is investigated in $\beta$-equilibrium. For simplicity, the consideration is performed in the framework of a NJL model with two quark flavors at ...
Barducci, Bedaque, Buballa, Buballa, D. Ebert, Ebert, Ebert, Ebert, He, Huang, K.G. Klimenko, Klevansky, Migdal, Nambu, Sawyer, Schwarz, Son, Son, Toublan, Volkov   +19 more
core   +1 more source

Colorectal cancer‐derived FGF19 is a metabolically active serum biomarker that exerts enteroendocrine effects on mouse liver

Molecular Oncology, EarlyView.
Meta‐transcriptome analysis identified FGF19 as a peptide enteroendocrine hormone associated with colorectal cancer prognosis. In vivo xenograft models showed release of FGF19 into the blood at levels that correlated with tumor volumes. Tumoral‐FGF19 altered murine liver metabolism through FGFR4, thereby reducing bile acid synthesis and increasing ...
Jordan M. Beardsley, Michael W. Rohr, Joseph A. Goode, Sai Preethi Nakkina, Jignesh G. Parikh, Deborah A. Altomare   +5 more
wiley   +1 more source