A search for the charged lepton flavor violating decay J/ψ → e± τ∓ with τ∓ → π∓ π0 ντ is performed with about 10 × 10 9 J/ψ events collected with the BESIII detector at the BEPCII. No significant ...signal is observed, and an upper limit is set on the branching fraction B (J/ψ → e± τ∓) < 7.5 × 10−8 at the 90% confidence level. This improves the previously published limit by two orders of magnitude.
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CMK, CTK, FMFMET, IJS, NUK, PNG, UM
In this work, we report the in-orbit demonstration of X-ray pulsar navigation with Insight-Hard X-ray Modulation Telescope (Insight-HXMT) Satellite, which was launched on 2017 June 15. The new pulsar ...navigation method "Significance Enhancement of Pulse-profile with Orbit-dynamics" is adopted to determine the orbit with observations of only one pulsar. In this test, the Crab pulsar is chosen and observed by Insight-HXMT from 2017 August 31 to September 5. Using the five-day long observation data, the orbit of Insight-HXMT is determined successfully with the three telescopes onboard: High Energy X-ray Telescope, Medium Energy X-ray Telescope, and Low Energy X-ray Telescope, respectively. By combining all the data, the position and velocity of the Insight-HXMT are pinpointed to within 10 km (3 ) and 10 m s−1 (3 ), respectively.
In 2012, a novel coronavirus (CoV) associated with severe respiratory disease, Middle East respiratory syndrome (MERS-CoV; previously known as human coronavirus-Erasmus Medical Center or hCoV-EMC), ...emerged in the Arabian Peninsula. To date, 114 human cases of MERS-CoV have been reported, with 54 fatalities. Animal models for MERS-CoV infection of humans are needed to elucidate MERS pathogenesis and to develop vaccines and antivirals. In this study, we developed rhesus macaques as a model for MERS-CoV using intratracheal inoculation. The infected monkeys showed clinical signs of disease, virus replication, histological lesions, and neutralizing antibody production, indicating that this monkey model is suitable for studies of MERS-CoV infection.
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BFBNIB, NMLJ, NUK, PNG, SAZU, UL, UM, UPUK
Strontium hexaferrite (SrFe12O19) nanofibres are successfully prepared by the electrospinning method followed by calcination. The effects of Fe3+/Sr2+ molar ratio and calcination temperature on the ...structure, morphology and magnetic properties are studied. The results indicate that a single phase of strontium hexaferrite is obtained at the Fe3+/Sr2+ molar ratio of 10.6 calcined at 700-1000 °C. When the Fe3+/Sr2+ molar ratio and the calcination temperature are 10.6 and 800 °C, respectively, SrFe12O19 nanofibres with a maximum coercivity value of 6853 Oe, a relatively high saturation magnetization of 59 emu g−1 and a remanent magnetization of 35 emu g−1 are achieved. The plausible mechanisms are given for the formation and variation in magnetic properties of the nanofibres.
The observation of a high-mobility two-dimensional electron gas between two insulating complex oxides, especially LaAlO₃/SrTiO₃, has enhanced the potential of oxides for electronics. The occurrence ...of this conductivity is believed to be driven by polarization discontinuity, leading to an electronic reconstruction. In this scenario, the crystal orientation has an important role and no conductivity would be expected, for example, for the interface between LaAlO₃ and (110)-oriented SrTiO₃, which should not have a polarization discontinuity. Here we report the observation of unexpected conductivity at the LaAlO₃/SrTiO₃ interface prepared on (110)-oriented SrTiO₃, with a LaAlO₃-layer thickness-dependent metal-insulator transition. Density functional theory calculation reveals that electronic reconstruction, and thus conductivity, is still possible at this (110) interface by considering the energetically favourable (110) interface structure, that is, buckled TiO₂/LaO, in which the polarization discontinuity is still present. The conductivity was further found to be strongly anisotropic along the different crystallographic directions with potential for anisotropic superconductivity and magnetism, leading to possible new physics and applications.
An experiment was conducted to compare the effects of selenium nanoparticle (T-1) and selenomethionine (T-2) on crucian carp,
Carassius auratus gibelio. There were significant differences (
P
<
0.05) ...in relative gain rate and final weight of T-1 and T-2 compared with the control. Survival rate and feed conversion ratio (FCR) were not affected by the dietary treatments. Fish fed the basal diet (control) showed lower (
P
<
0.05) selenium content in muscle (6.10
±
0.78 μg g
−
1
) compared to T-1 and T-2 (16.42
±
1.07 μg g
−
1
and 13.52
±
1.31 μg g
−
1
, respectively). Furthermore, the highest value (
P
<
0.05) of selenium content in muscle was observed in T-1. Glutathione peroxidase (GSH-Px) activities in carps plasma and liver of T-1 and T-2 were significantly different (
P
<
0.05) with that of the control. However, no significant differences were observed in GSH-Px activities both in plasma and liver between T-1 and T-2.
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GEOZS, IJS, IMTLJ, KILJ, KISLJ, NUK, OILJ, PNG, SAZU, SBCE, SBJE, UL, UM, UPCLJ, UPUK
α-decay always has enormous impetuses to the development of physics and chemistry, in particular due to its indispensable role in the research of new elements. Although it has been observed in ...laboratories for more than a century, it remains a difficult problem to calculate accurately the formation probability Sα microscopically. To this end, we establish a new model, i.e., multistep model, and the corresponding formation probability Sα values of some typical α-emitters are calculated without adjustable parameters. The experimental half-lives, in particular their irregular behavior around a shell closure, are remarkably well reproduced by half-life laws combined with these Sα. In our strategy, the cluster formation is a gradual process in heavy nuclei, different from the situation that cluster pre-exists in light nuclei. The present study may pave the way to a fully understanding of α-decay from the perspective of nuclear structure.
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GEOZS, IJS, IMTLJ, KILJ, KISLJ, NLZOH, NUK, OILJ, PNG, SAZU, SBCE, SBJE, UILJ, UL, UM, UPCLJ, UPUK, ZAGLJ, ZRSKP
Genome-wide association studies (GWASs) have revealed the worldwide heterogeneity of genetic factors in tuberculosis (TB) susceptibility. Despite having the third highest global TB burden, no ...TB-related GWAS has been performed in China. Here, we performed the first three-stage GWAS on TB in the Han Chinese population. In the stage 1 (discovery stage), after quality control, 691 388 SNPs present in 972 TB patients and 1537 controls were retained. After replication on an additional 3460 TB patients and 4862 controls (stages 2 and 3), we identified three significant loci associated with TB, the most significant of which was rs4240897 (logistic regression P = 1.41 × 10-11, odds ratio = 0.79). The aforementioned three SNPs were harbored by MFN2, RGS12 and human leukocyte antigen class II beta chain paralogue encoding genes, all of which are candidate immune genes associated with TB. Our findings provide new insight into the genetic background of TB in the Han Chinese population.
We show a new resonance acceleration scheme for generating ultradense relativistic electron bunches in helical motions and hence emitting brilliant vortical γ-ray pulses in the quantum electrodynamic ...(QED) regime of circularly-polarized (CP) laser-plasma interactions. Here the combined effects of the radiation reaction recoil force and the self-generated magnetic fields result in not only trapping of a great amount of electrons in laser-produced plasma channel, but also significant broadening of the resonance bandwidth between laser frequency and that of electron betatron oscillation in the channel, which eventually leads to formation of the ultradense electron bunch under resonant helical motion in CP laser fields. Three-dimensional PIC simulations show that a brilliant γ-ray pulse with unprecedented power of 6.7 PW and peak brightness of 10
photons/s/mm
/mrad
/0.1% BW (at 15 MeV) is emitted at laser intensity of 1.9 × 10
W/cm
.
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IZUM, KILJ, NUK, PILJ, PNG, SAZU, UL, UM, UPUK
Alendronate is an antiosteoporotic drug that targets the mevalonate pathway. To investigate whether the genetic variations in this pathway affect the clinical efficacy of alendronate in ...postmenopausal Chinese women with osteopenia or osteoporosis, 23 single-nucleotide polymorphisms (SNPs) in 7 genes were genotyped in 500 patients treated with alendronate for 12 months. Bone mineral density (BMD) was measured at baseline and after 12 months. The rs10161126 SNP in the 3' flanking region of MVK and the GTCCA haplotype in FDFT1 were significantly associated with therapeutic response. A 6.6% increase in BMD in the lumbar spine was observed in the GG homozygotes of rs10161126; AG heterozygotes and AA homozygotes experienced a 4.4 and 4.5% increase, respectively. The odds ratio (95% confidence interval) of G allele carriers to be responders in lumbar spine BMD was 2.06 (1.08-6.41). GTCCA haplotype in FDFT1 was more frequently detected in the group of responders than in the group of non-responders at the total hip (2.6 vs 0.5%, P=0.009). Therefore, MVK and FDFT1 polymorphisms are genetic determinants for BMD response to alendronate therapy in postmenopausal Chinese women.
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DOBA, EMUNI, FIS, FZAB, GEOZS, GIS, IJS, IMTLJ, IZUM, KILJ, KISLJ, MFDPS, NLZOH, NUK, OILJ, PILJ, PNG, SAZU, SBCE, SBJE, SBMB, SBNM, UILJ, UKNU, UL, UM, UPUK, VKSCE, ZAGLJ
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