1,270 research outputs found
The electromagnetic decays of as the state and its radial excited states
We study the electromagnetic (EM) decays of as the
state by using the relativistic Bethe-Salpeter method. Our
results are keV,
keV,
keV and
keV. The ratio , agrees with the experimental
data. Similarly, the EM decay widths of , , are
predicted, and we find the dominant decays channels are
, where . The
wave function include different partial waves, which means the relativistic
effects are considered. We also study the contributions of different partial
waves.Comment: 20 pages, 6 figures, 9 table
Cloning and characterization of functional keratinassociated protein 5-4 gene in maize
Keratin-associated proteins (KAPs) 5-4 which belongs to keratin-associated protein (KRTAP) type 5 family has two major groups: high/ultrahigh cysteine (HS) and high glycine-tyrosine (HGT). Based on bioinformatic prediction, we experimentally cloned a fragment containingan open reading frame of 1849 bp from maize, which encodes a protein of 408 amino acids. BLAST analysis indicated that KAP5-4 is homologous to the qPE9-1 protein in rice. Conserved domains analysis predicted the presence of five domains. Real time reverse transcriptase polymerase chain reaction (RT-PCR) indicated that the expression of this gene is up-regulated in response to water-deficit stress in the root and leaf.Keywords: Maize, keratin-associated protein 5-4, water-deficit stress.African Journal of Biotechnology Vol. 11(29), pp. 7417-7423, 10 April, 201
Study on muon anomalous magnetic dipole moment in BLMSSM via the mass insertion approximation
There are 4.2 deviations between the updated experimental results of
muon anomalous magnetic dipole moment (MDM) and the corresponding theoretical
prediction of the Standard Model (SM). We calculate the muon MDM in the
framework of the MSSM extension with local gauged baryon and lepton numbers
(BLMSSM). In this paper, we discuss how the muon MDM depends on the parameters
in the BLMSSM in detail within the mass insertion approximation. Among the many
parameters, , , and are more
sensitive parameters. Considering the experimental limitations, our best
numerical result of is around , which can
well compensate the departure between the experiment data and SM prediction
Study lepton flavor violation within the Mass Insertion Approximation
We study lepton flavor violating (LFV) decays
(,
and ) in the SSM,
which is the extension of the minimal supersymmetric standard
model(MSSM). The local gauge group of SSM is . These processes are strictly forbidden in the
standard model(SM), but these LFV decays are a signal of new physics(NP). We
use the Mass Insertion Approximation(MIA) to find sensitive parameters that
directly influence the result of the branching ratio of LFV decay
. Combined with the latest experimental
results, we analyze the relationship between different sensitive parameters and
the branching ratios of the three processes. According to the numerical
analysis, we can conclude that the main sensitive parameters and LFV sources
are the non-diagonal terms of the slepton mass matrix
Theoretical Corrections of and
is the ratio of branching ratio to . There is a gap of or more between
its experimental value and the prediction under the standard model(SM). People
extend the MSSM with the local gauge group to obtain the SSM.
Compared with MSSM, SSM has more superfields and effects. In
SSM, we research the decays and calculate . The obtained numerical
results of are further corrected under SSM, which is much
better than the SM predictions. After correction, the theoretical value of
can reach in one range of the averaged experiment
central value
Assessment of absorption of four lignan constituents of JingNing particles in rat gut using in situ single-pass intestinal perfusion
Purpose: To study small intestinal absorption of schisadrol A, schisandrol B, schizandrin A and schisandrin B in JingNing particles using in situ single-pass intestinal perfusion (SPIP).Methods: Absorption rate constant (Ka) and apparent permeability (Papp) of the drugs at different concentrations in various parts of rat small intestine (duodenum, jejunum and ileum) were determined using SPIP. JingNing particles were also perfused in situ at different pH in the entire rat intestine. Ethanol extract of Schisandra chinensis (standard) at low concentration was perfused in the duodenum for comparison with extract of JingNing particles.Results: The order of apparent permeability of the four lignans was schisandrol A < schisandrol B < schizandrin A < schisandrin B. Ka and Papp values of the four lignans in JingNing particles were concentration-dependent. Absorption increased in the rank order: ileum > duodenum > jejunum. Optimum absorption pH was 6.50. Polygala tenuifolia extract and volatile oil of Rhizoma acori tatarinowii significantly (p < 0.05) enhanced the absorption of the four lignans.Conclusion: The four lignans were well absorbed in the intestinal tract, particularly the ileum, probably through carrier-mediated transport. The alcohol extract of Polygala tenuifolia and volatile oil of Rhizoma acori graminei enhanced the absorption of the four lignans.Keywords: JingNing, Intestinal absorption, Polygala tenuifolia, Rhizoma acori graminei, Lignans, Schisandrol, Schisandrin, Single-pass intestinal perfusio
mixing in the SSM
SSM is a non-universal Abelian extension of the Minimal
Supersymmetric Standard Model (MSSM) and its local gauge group is extended to
. Based on the latest data of
neutral meson mixing and experimental limitations, we investigate the process
of mixing in SSM. Using the effective Hamiltonian
method, the Wilson coefficients and mass difference are
derived. The abundant numerical results verify that
and
are sensitive parameters to the process of mixing. With
further measurement in the experiment, the parameter space of the SSM
will be further constrained during the mixing process of
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