974 research outputs found
PP-027 Experimental research on the effect of RNA interference specific for Smad4 gene on the activated hepatic stellate cells
The Different Nature in Seyfert 2 Galaxies With and Without Hidden Broad-Line Regions
We compile a large sample of 120 Seyfert 2 galaxies (Sy2s) which contains 49
hidden broad-line region (HBLR) Sy2s and 71 non-HBLR Sy2s. From the difference
in the power sources between two groups, we test if HBLR Sy2s are dominated by
active galactic nuclei (AGNs), and if non-HBLR Sy2s are dominated by
starbursts. We show that: (1) HBLR Sy2s have larger accretion rates than
non-HBLR Sy2s; (2) HBLR Sy2s have larger \Nev /\Neii and \oiv /\Neii line ratios than non-HBLR
Sy2s; (3) HBLR Sy2s have smaller flux ratio which shows
the relative strength of the host galaxy and nuclear emission than non-HBLR
Sy2s. So we suggest that HBLR Sy2s and non-HBLR Sy2s are AGN-dominated and
starburst-dominated, respectively. In addition, non-HBLR Sy2s can be classified
into the luminous () and less luminous
() samples, when considering only
their obscuration. We suggest that: (1) the invisibility of polarized broad
lines (PBLs) in the luminous non-HBLR Sy2s depends on the obscuration; (2) the
invisibility of PBLs in the less luminous non-HBLR Sy2s depends on the very low
Eddington ratio rather than the obscuration.Comment: Accepted by ApJ, 11 pages, 4 figure
Effect of ingestion by two frugivorous bat species on the seed germination of Ficus racemosa and F. hispida (Moraceae
The Genetic Architecture of Diet-Induced Hepatic Fibrosis in Mice
We report the genetic analysis of a "humanized" hyperlipidemic mouse model for progressive nonalcoholic steatohepatitis (NASH) and fibrosis. Mice carrying transgenes for human apolipoprotein E*3-Leiden and cholesteryl ester transfer protein and fed a "Western" diet were studied on the genetic backgrounds of over 100 inbred mouse strains. The mice developed hepatic inflammation and fibrosis that was highly dependent on genetic background, with vast differences in the degree of fibrosis. Histological analysis showed features characteristic of human NASH, including macrovesicular steatosis, hepatocellular ballooning, inflammatory foci, and pericellular collagen deposition. Time course experiments indicated that while hepatic triglyceride levels increased steadily on the diet, hepatic fibrosis occurred at about 12 weeks. We found that the genetic variation predisposing to NASH and fibrosis differs markedly from that predisposing to simple steatosis, consistent with a multistep model in which distinct genetic factors are involved. Moreover, genome-wide association identified distinct genetic loci contributing to steatosis and NASH. Finally, we used hepatic expression data from the mouse panel and from 68 bariatric surgery patients with normal liver, steatosis, or NASH to identify enriched biological pathways. Conclusion: The pathways showed substantial overlap between our mouse model and the human disease
Superconductivity and Charge-density-wave-like Transition in Th2Cu4As5
We report the synthesis, crystal structure, and physical properties of a
novel ternary compound, ThCuAs. The material crystallizes in a
tetragonal structure with lattice parameters {\AA} and
{\AA}. Its structure can be described as an alternating stacking
of fluorite-type ThAs layers with antifluorite-type double-layered
CuAs slabs. The measurement of electrical resistivity, magnetic
susceptibility and specific heat reveals that ThCuAs undergoes bulk
superconducting transition at 4.2 K. Moreover, all these physical quantities
exhibit anomalies at 48 K, where the Hall coefficient change the sign. These
findings suggest a charge-density-wave-like (CDW) transition, making
ThCuAs a rare example for studying the interplay between CDW and
superconductivity.Comment: 11 pages, 6 figures, and 1 tabl
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