2,625 research outputs found
Composition of nuclear matter with light clusters and Bose-Einstein condensation of particles
The Bose-Einstein condensation of partciles in the multicomponent
environment of dilute, warm nuclear matter is studied. We consider the cases of
matter composed of light clusters with mass numbers and matter that
in addition these clusters contains \isotope[56]{Fe} nuclei. We apply the
quasiparticle gas model which treats clusters as bound states with infinite
life-time and binding energies independent of temperature and density. We show
that the particles can form a condensate at low temperature
MeV in such matter in the first case. When the \isotope[56]{Fe} nucleus is
added to the composition the cluster abundances are strongly modified at low
temperatures, with an important implication that the condensation at
these temperatures is suppressed.Comment: 15 pages, 8 figure
Protective effect of rhamnopyranosyl vanilloyl isolated from Scrophularia ningpoensis Hemsl (Scrophulariaceae) root against acute liver injury in mice
Purpose: To investigate the protective effect of rhamnopyranosyl vanilloyl (RV) from Scrophularia ningpoensis root against tetrachloromethane (CCl4)-induced acute liver injury (ALI) in mice.Methods: RV was isolated from S. ningpoensis by column chromatography. ALI model of mice was established by intraperitoneal injection of CCl4. Liver index, liver function indices, as well as serum alanine transaminase (ALT), aspartate aminotransferase (AST) and total bilirubin (TBIL) were evaluated. Lipid peroxidation (LPO)-related indices, including malonaldehyde (MDA), glutathione (GSH), superoxide dismutase (SOD) and glutathione peroxidase (GSH-Px). Apoptotic proteins (Bcl-2, Bax and caspase-3) in liver tissue were determined by enzyme-linked immunosorbent assay (ELISA) and Western blot.Results: After treatment with RV (10, 20 or 40 mg/kg), liver index (5.65 - 5.21 vs. 6.68 %), ALT (90.18 - 79.68 vs. 112.47 U/L), AST (64.44 - 57.63 vs. 75.41 U/L) and TBIL (2.68 - 1.95 vs. 3.21 U/L) activities, as well as MDA (3.58 - 2.88 vs. 4.13 μmol/g), Bax and caspase-3 levels significantly (p < 0.05 or 0.01) decreased, compared with those in control group. After treatment with RV (10, 20 or 40 mg/kg), GSH (16.58 - 22.14 vs. 12.34 μmol/g), Bcl-2, SOD (86.45 - 107.61 vs. 68.43 U/mg) and GSH-Px (295.64 - 329.47 vs. 268.49 U/mg) levels or activities significantly (p < 0.05 or 0.01) increased, compared with those in control group.Conclusion: RV has protective effect against CCl4-induced ALI in mice, and the mechanisms involve the inhibition of LPO and apoptosis in liver cells. Thus, RV is a potential drug for the treatment of liver injuryKeywords: Rhamnopyranosyl vanilloyl, Scrophularia ningpoensis, Liver injury, Protective effect, Lipid peroxidation, Apoptosi
Chiral phase modulation and tunable broadband perfect absorber using the coherent cold atomic ensemble
We investigate the two-channel nonreciprocal scattering of a coherent atomic
ensemble under the linear spatial Kramers-Kronig modulation, which has
potential applications in chiral phase modulation and broadband coherent
perfect/asymmetric absorber that yet is typically unavailable in conventional
continuous atomic media. In the regime of electromagnetically induced
transparency, we observe the direction-dependent (chiral) phase modulation,
which may enrich the burgeoning chiral quantum optics and can be used for
implementing photonic filters, unidirectional amplifiers, and coherent
asymmetric absorbers. By simplifying the stringent generation condition of
coherent perfect absorption (CPA), we demonstrate the possibility of realizing
two-channel CPA with broadband and sharp edges. Our proposal may be used to
design and integrate some all-optical functional devices at extremely low power
levels for quantum information processing and optical communication networks
Precision test of the weak interaction with slow muons
We propose to use slow muons facilities combined with cyclotron radiation
detection for precision test of the weak interaction in the muon decays. Slow
positive muon bunches are first injected into a cylindrical superconducting
vacuum chamber with uniform strong axial magnetic fields to radially confine
the muons. The positrons resulting from muon decays can be detected by their
cyclotron radiation, which can be transported to low-noise electronic devices
through waveguides coupled to the chamber. The decay positron's energy can be
precisely measured down to eV level in the low energy region, which is
sensitive to new physics effects such as Majorana neutrinos and new structures
of weak interactions
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