360 research outputs found
The signal of in nucleon-antinucleon scattering
We study the production of at a nucleon-antinucleon scattering
experiment. Considering the PANDA experiment to be an ideal platform to explore
the production of the charmonium and charmonim-like states, we suggest the
forthcoming PANDA experiment to pay attention to the production of
.Comment: 6 pages, 15 figures. Published version in EPJ
Media utilization for mobilizing women for national programme on immunization
Inappropriate or inadequate use of communication strategies to create a sustained awareness among stakeholders
has been identified as a major obstacle to the attainment of the goals ofprimary health care delivery in Nigeria
The study thus examined media utilizationfor mobilizing womenfor the National Programme on Immunization
(NPI) in Oyo State. Study was conducted in Iseyin, Oluyole and Akinyele local government areas and the
population comprised of pregnant women and nursing mothers. Two wards were purposively selectedfrom each
local government area to make a total of six wards. Twenty respondents were randomly selected from each of the
six wards to make a sample size of 120. Structured questionnaire was used to elicit information on respondents'
sources of immunization messages, uptake of immunization services, problems encountered by respondents in
accessing immunization services and their media preference. Data were analysed using descriptive statistics
and chi square statistical tool was used to show the relationship in the stated hypothesis. If wide range of
information sources were available to women but prominent among these were health workers (96.2), radio
(93.3) and television (88.6). Majority of respondents (98.1%) preferred health workers as their source 0./
immunization messages and least preference were indicated for neighbors (39.1%) newspapers (34.3%) and
posters (/4.3%). The most severe problems faced by women in accessing immunization services were tension due
to delay in getting attention and long distance of immunization centers FO/~l their houses. On the other hand,
shortage of vaccines, poor immunization facilities and inadequacy of trained health workers were ranked as
less severe problems. Also, a significant relationship exists between respondents' location; their level of education
on and their usage of immunization messages (XZ= 8.9, 12.7 P::::' 0.05). Interpersonal communication strategy
involving the use of health workers was most effective in women mobilizationfor the NPI programme. In addition,
utilization of media messages on NPI is affected by the level of education of respondents. It is recommended that
priority attention be paid to the use of health workers in NPI information dissemination while the use of other
communication strategies should be reinforced. Furthermore, media messages on NPI should be packaged and
relayed with careful attention to the level of education of the vast majority of the pregnant and nursing women
in the state
Higher moments of nucleon spin structure functions in heavy baryon chiral perturbation theory and in a resonance model
The third moment of the twist-3 part of the nucleon spin structure
function is generalized to arbitrary momentum transfer and is
evaluated in heavy baryon chiral perturbation theory (HBChPT) up to order
and in a unitary isobar model (MAID). We show how to link
as well as higher moments of the nucleon spin structure functions
and to nucleon spin polarizabilities. We compare our results with the
most recent experimental data, and find a good description of these available
data within the unitary isobar model. We proceed to extract the twist-4 matrix
element which appears in the suppressed term in the twist
expansion of the spin structure function for proton and neutron.Comment: 30 pages, 7 figure
CP asymmetries in penguin-induced B decays in general left-right models
We study CP asymmetries in penguin-induced b -> s\bar{s}s decays in general
left-right models without imposing manifest or pseudomanifest left-right
symmetry. Using the effective Hamiltonian approach, we evaluate CP asymmetries
in B^\pm -> \phi K^{(\ast)\pm} decays as well as mixing induced B meson decays
B -> J/\psi K_s and B -> \phi K_s decays. Based on recent measurements
revealing large CP violation, we show that nonmanifest type model is more
favored than manifest or pseudomanifest type.Comment: 16 pages, 12 eps figure
Neutral weak currents in pion electroproduction on the nucleon
Parity violating asymmetry in inclusive scattering of longitudinally
polarized electrons by unpolarized protons with or meson
production, is calculated as a function of the momentum transfer squared
and the total energy of the -system. This asymmetry, which is
induced by the interference of the one-photon exchange amplitude with the
parity-odd part of the -exchange amplitude, is calculated for the
processes ( is a virtual photon and
a virtual Z-boson) considering the -contribution in the channel,
the standard Born contributions and vector meson ( and )
exchanges in the channel. Taking into account the known isotopic properties
of the hadron electromagnetic and neutral currents, we show that the P-odd term
is the sum of two contributions. The main term is model independent and it can
be calculated exactly in terms of fundamental constants. It is found to be
linear in . The second term is a relatively small correction which is
determined by the isoscalar component of the electromagnetic current. Near
threshold and in the -region, this isoscalar part is much smaller (in
absolute value) than the isovector one: its contribution to the asymmetry
depend on the polarization state (longitudinal or transverse) of the virtual
photon.Comment: 30 pages 9 figure
Scintillation-only Based Pulse Shape Discrimination for Nuclear and Electron Recoils in Liquid Xenon
In a dedicated test setup at the Kamioka Observatory we studied pulse shape
discrimination (PSD) in liquid xenon (LXe) for dark matter searches. PSD in LXe
was based on the observation that scintillation light from electron events was
emitted over a longer period of time than that of nuclear recoil events, and
our method used a simple ratio of early to total scintillation light emission
in a single scintillation event. Requiring an efficiency of 50% for nuclear
recoil retention we reduced the electron background to 7.7\pm1.1(stat)\pm1.2
0.6(sys)\times10-2 at energies between 4.8 and 7.2 keVee and to
7.7\pm2.8(stat)\pm2.5 2.8(sys)\times10-3 at energies between 9.6 and 12 keVee
for a scintillation light yield of 20.9 p.e./keV. Further study was done by
masking some of that light to reduce this yield to 4.6 p.e./keV, the same
method results in an electron event reduction of 2.4\pm0.2(stat)\pm0.3
0.2(sys)\times10-1 for the lower of the energy regions above. We also observe
that in contrast to nuclear recoils the fluctuations in our early to total
ratio for electron events are larger than expected from statistical
fluctuations.Comment: 25 pages, 15 figure
Search for solar axions in XMASS, a large liquid-xenon detector
XMASS, a low-background, large liquid-xenon detector, was used to search for
solar axions that would be produced by bremsstrahlung and Compton effects in
the Sun. With an exposure of 5.6ton days of liquid xenon, the model-independent
limit on the coupling for mass 1keV is
(90% C.L.), which is a factor of two stronger than the existing experimental
limit. The bounds on the axion masses for the DFSZ and KSVZ axion models are
1.9 and 250eV, respectively. In the mass range of 10-40keV, this study produced
the most stringent limit, which is better than that previously derived from
astrophysical arguments regarding the Sun to date
B\bar{B} Mixing and CP Violation in SU(2)_L \times SU(2)_R \times U(1) Models
We reexamine the mass mixing and CP violation in the B\bar{B} system in
general SU(2)_L \times SU(2)_R \times U(1) models related to the recent
measurements. The right-handed contributions can be sizable in B\bar{B} mixing
and CP asymmetry in B decays for a heavy W^\prime even with a mass about 3 TeV.
On the other hand the lower bound on the mass of W^\prime can be taken down to
approximately 300 GeV.Comment: 17 pages, 15 eps figures, corrected typos, added referenc
A high concentration of genistein down-regulates activin A, Smad3 and other TGF-β pathway genes in human uterine leiomyoma cells
Previously, we found that high doses of genistein show an inhibitory effect on uterine leiomyoma (UtLM) cell proliferation. In this study, using microarray analysis and Ingenuity Pathways Analysis™, we identified genes (up- or down-regulated, ≥ 1.5 fold, P ≤ 0.001), functions and signaling pathways that were altered following treatment with an inhibitory concentration of genistein (50 µg/ml) in UtLM cells. Downregulation of TGF-β signaling pathway genes, activin A, activin B, Smad3, TGF-β2 and genes related to cell cycle regulation, with the exception of the upregulation of the CDK inhibitor P15, were identified and validated by real-time RT-PCR studies. Western blot analysis further demonstrated decreased protein expression of activin A and Smad3 in genistein-treated UtLM cells. Moreover, we found that activin A stimulated the growth of UtLM cells, and the inhibitory effect of genistein was partially abrogated in the presence of activin A. Overexpression of activin A and Smad3 were found in tissue samples of leiomyoma compared to matched myometrium, supporting the contribution of activin A and Smad3 in promoting the growth of UtLM cells. Taken together, these results suggest that down-regulation of activin A and Smad3, both members of the TGF-β pathway, may offer a mechanistic explanation for the inhibitory effect of a high-dose of genistein on UtLM cells, and might be potential therapeutic targets for treatment of clinical cases of uterine leiomyomas
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