353 research outputs found
Transcriptome analysis of Dnmt3l knock-out mice derived multipotent mesenchymal stem/stromal cells during osteogenic differentiation
Multipotent mesenchymal stem/stromal cells (MSCs) exhibit great potential for cell-based therapy. Proper epigenomic signatures in MSCs are important for the maintenance and the subsequent differentiation potential. The DNA methyltransferase 3-like (DNMT3L) that was mainly expressed in the embryonic stem (ES) cells and the developing germ cells plays an important role in shaping the epigenetic landscape. Here, we report the reduced colony forming ability and impaire
Naturally occurring mutations in the PA gene are key contributors to increased virulence of pandemic H1N1/09 influenza virus in mice
We examined the molecular basis of virulence of pandemic H1N1/09 influenza viruses by reverse genetics based on two H1N1/09 virus isolates (A/California/04/2009 [CA04] and A/swine/Shandong/731/2009 [SD731]) with contrasting pathogenicities in mice. We found that four amino acid mutations (P224S in the PA protein [PA-P224S], PB2-T588I, NA-V106I, and NS1-I123V) contributed to the lethal phenotype of SD731. In particular, the PA-P224S mutation when combined with PA-A70V in CA04 drastically reduced the virus's 50% mouse lethal dose (LD50), by almost 1,000-fold
Interaction of δ-opioid receptor with membrane transporters: Possible mechanisms in pain suppression by acupuncture
Search for C-parity violation in and
Using events recorded in
collisions at 3.686 GeV with the BESIII at the BEPCII collider, we
present searches for C-parity violation in and decays via . No significant
signals are observed in either channel. Upper limits on the branching fractions
are set to be and
at the 90\%
confidence level. The former is one order of magnitude more stringent than the
previous upper limit, and the latter represents the first limit on this decay
channel.Comment: 7 pages, 2 figure
Measurement of the proton form factor by studying
Using data samples collected with the BESIII detector at the BEPCII collider,
we measure the Born cross section of at 12
center-of-mass energies from 2232.4 to 3671.0 MeV. The corresponding effective
electromagnetic form factor of the proton is deduced under the assumption that
the electric and magnetic form factors are equal . In
addition, the ratio of electric to magnetic form factors, , and
are extracted by fitting the polar angle distribution of the proton
for the data samples with larger statistics, namely at 2232.4 and
2400.0 MeV and a combined sample at = 3050.0, 3060.0 and 3080.0 MeV,
respectively. The measured cross sections are in agreement with recent results
from BaBar, improving the overall uncertainty by about 30\%. The
ratios are close to unity and consistent with BaBar results in
the same region, which indicates the data are consistent with the
assumption that within uncertainties.Comment: 13 pages, 24 figure
Observation of the state in at BESIII
We report the observation of the in the process with a statistical
significance of , in data samples at center-of-mass energies
4.230, 4.260, 4.360, 4.420 and 4.600~GeV collected with the BESIII
detector at the BEPCII electron positron collider. The measured mass of the
is ~MeV/, where the first error is
statistical and the second systematic, and the width is less than ~MeV at
the 90\% confidence level. The products of the Born cross sections for
and the branching ratio are also measured. These measurements are in good
agreement with the assignment of the as the charmonium
state.Comment: 7 pages, 3 figures, version to appear in Phys. Rev. Let
Precision measurement of the decay branching fractions
Using 482 pb of data taken at GeV, we measure the
branching fractions of the decays of into and
to be \BR(D^{*0} \to D^0\pi^0)=(65.5\pm 0.8\pm 0.5)% and \BR(D^{*0} \to
D^0\gamma)=(34.5\pm 0.8\pm 0.5)% respectively, by assuming that the
decays only into these two modes. The ratio of the two branching fractions is
\BR(D^{*0} \to D^0\pi^0)/\BR(D^{*0} \to D^0\gamma) =1.90\pm 0.07\pm 0.05,
which is independent of the assumption made above. The first uncertainties are
statistical and the second ones systematic. The precision is improved by a
factor of three compared to the present world average values
Observation of the Dalitz Decay
We report the first observation of the Dalitz decay , based on a data sample of 1.31 billion events collected with
the BESIII detector. The mesons are produced via the decay process. The ratio is measured to be
. This
corresponds to a branching fraction . The transition form
factor is extracted and different expressions are compared to the measured
dependence on the invariant mass. The results are consistent with the
prediction of the Vector Meson Dominance model.Comment: 11 pages,7 figure
Measurement of in oscillation using quantum correlations in at = 3.773\,GeV
We report a measurement of the parameter in
\ensuremath{D^0}\xspace-\ensuremath{\overline{D}^{0}}\xspace oscillations
performed by taking advantage of quantum coherence between pairs of
\ensuremath{D^0}\xspace \ensuremath{\overline{D}^{0}}\xspace mesons produced
in annihilations near threshold. In this work, doubly-tagged
\ensuremath{D^0}\xspace \ensuremath{\overline{D}^{0}}\xspace events, where
one decays to a eigenstate and the other decays in a semileptonic
mode, are reconstructed using a data sample of 2.92\,fb collected with
the BESIII detector at the center-of-mass energy of = 3.773\,GeV. We
obtain , where the first uncertainty is
statistical and the second is systematic. This result is compatible with the
current world average.Comment: 13 pages, 3 figure
Search for the isospin violating decay
Using data samples collected at center of mass energies of =
4.009, 4.226, 4.257, 4.358, 4.416 and 4.599 GeV with the BESIII detector
operating at the BEPCII storage ring, we search for the isospin violating decay
. No signal is observed, and upper
limits on the cross section
at the 90\% confidence level are determined to be 3.6, 1.7, 2.4, 1.4, 0.9 and
1.9 pb, respectively.Comment: 7 pages, 2 figure
- …