4,163 research outputs found
Statefinder hierarchy exploration of the extended Ricci dark energy
We apply the statefinder hierarchy plus the fractional growth parameter to
explore the extended Ricci dark energy (ERDE) model, in which there are two
independent coefficients and . By adjusting them, we plot
evolution trajectories of some typical parameters, including Hubble expansion
rate , deceleration parameter , the third and fourth order hierarchy
and and fractional growth parameter ,
respectively, as well as several combinations of them. For the case of variable
and constant , in the low-redshift region the evolution
trajectories of are in high degeneracy and that of separate somewhat.
However, the CDM model is confounded with ERDE in both of these two
cases. and , especially the former, perform much better.
They can differentiate well only varieties of cases within ERDE except
CDM in the low-redshift region. For high-redshift region, combinations
can break the degeneracy. Both of
and have the ability to
discriminate ERDE with from CDM, of which the degeneracy
cannot be broken by all the before-mentioned parameters. For the case of
variable and constant , and can
only discriminate ERDE from CDM. Nothing but pairs
and can discriminate not only
within ERDE but also ERDE from CDM. Finally we find that
is surprisingly a better choice to discriminate within ERDE itself, and ERDE
from CDM as well, rather than .Comment: 8 pages, 14 figures; published versio
SU(5) Symmetry of spdfg Interacting Boson Model
The extended interacting boson model with s-, p-, d-, f- and g-bosons being
included (spdfg IBM) are investigated. The algebraic structure including the
generators, the Casimir operators of the groups at the SU(5) dynamical symmetry
and the branching rules of the irreducible representation reductions along the
group chain are obtained. The typical energy spectrum of the Symmetry is given.Comment: 12 pages, 2 figure
Two Photon Transition Form Factor of Quarkonia
The two photon transition of quarkonia are studied within a
covariant approach based on the consistent truncation scheme of the quantum
chromodynamics Dyson-Schwinger equation for the quark propagator and the
Bethe--Salpeter equation for the mesons. We find the decay widths of
and in good
agreement with experimental data. The obtained transition form factor of
for a wide range of space-like photon
momentum transfer squared is also in agreement with the experimental findings
of the BABAR experiment. As a by-product, the decay widths of
and the transition form factor of
are predicted, which
await for experimental test
Genetically engineered pre-microRNA-34a prodrug suppresses orthotopic osteosarcoma xenograft tumor growth via the induction of apoptosis and cell cycle arrest.
Osteosarcoma (OS) is the most common primary malignant bone tumor in children, and microRNA-34a (miR-34a) replacement therapy represents a new treatment strategy. This study was to define the effectiveness and safety profiles of a novel bioengineered miR-34a prodrug in orthotopic OS xenograft tumor mouse model. Highly purified pre-miR-34a prodrug significantly inhibited the proliferation of human 143B and MG-63 cells in a dose dependent manner and to much greater degrees than controls, which was attributed to induction of apoptosis and G2 cell cycle arrest. Inhibition of OS cell growth and invasion were associated with release of high levels of mature miR-34a from pre-miR-34a prodrug and consequently reduction of protein levels of many miR-34a target genes including SIRT1, BCL2, c-MET, and CDK6. Furthermore, intravenous administration of in vivo-jetPEI formulated miR-34a prodrug significantly reduced OS tumor growth in orthotopic xenograft mouse models. In addition, mouse blood chemistry profiles indicated that therapeutic doses of bioengineered miR-34a prodrug were well tolerated in these animals. The results demonstrated that bioengineered miR-34a prodrug was effective to control OS tumor growth which involved the induction of apoptosis and cell cycle arrest, supporting the development of bioengineered RNAs as a novel class of large molecule therapeutic agents
Evolution of the Structural and Electronic Properties of Medium-Sized Sodium Clusters: A Honeycomb-Like Na20 Cluster
Band renormalization and Fermi surface reconstruction in iron-based superconductors
Using the fluctuation exchange approximation and a three-orbital model, we
study the band renormalization, Fermi surface reconstruction and the
superconducting pairing symmetry in the newly-discovered iron-based
superconductors. We find that the inter-orbital spin fluctuations lead to the
strong anisotropic band renormalization and the renormalization is orbital
dependent. As a result, the topology of Fermi surface displays distinct
variation with doping from the electron type to the hole type, which is
consistent with the recent experiments. This shows that the Coulomb
interactions will have a strong effect on the band renormalization and the
topology of the electron Fermi pocket. In addition, the pairing state mediated
by the inter-orbital spin fluctuation is of an extended s-wave symmetry.Comment: 16 pages, 6 figure
Phase diagram and thermal properties of strong-interaction matter
We introduce a novel procedure for computing the (mu,T)-dependent pressure in
continuum QCD; and therefrom obtain a complex phase diagram and predictions for
thermal properties of the system, providing the in-medium behaviour of the
trace anomaly, speed of sound, latent heat and heat capacity.Comment: 6 pages, 4 figures. Minor amendments in the version accepted for
publicatio
- …