7,194 research outputs found
Discriminating the effects of collapse models from environmental diffusion with levitated nanospheres
Collapse models postulate the existence of intrinsic noise which modifies
quantum mechanics and is responsible for the emergence of macroscopic
classicality. Assessing the validity of these models is extremely challenging
because it is nontrivial to discriminate unambiguously their presence in
experiments where other hardly controllable sources of noise compete to the
overall decoherence. Here we provide a simple procedure able to probe the
hypothetical presence of the collapse noise with a levitated nanosphere in a
Fabry-Perot cavity. We show that the stationary state of the system is
particularly sensitive, under specific experimental conditions, to the
interplay between the trapping frequency, the cavity size, and the momentum
diffusion induced by the collapse models, allowing to detect them even in the
presence of standard environmental noises.Comment: close to the published versio
Detection of the large scale alignment of massive galaxies at z~0.6
We report on the detection of the alignment between galaxies and large-scale
structure at z~0.6 based on the CMASS galaxy sample from the Baryon Oscillation
Spectroscopy Survey data release 9. We use two statistics to quantify the
alignment signal: 1) the alignment two-point correlation function which probes
the dependence of galaxy clustering at a given separation in redshift space on
the projected angle (theta_p) between the orientation of galaxies and the line
connecting to other galaxies, and 2) the cos(2theta)-statistic which estimates
the average of cos(2theta_p) for all correlated pairs at given separation. We
find significant alignment signal out to about 70 Mpc/h in both statistics.
Applications of the same statistics to dark matter halos of mass above 10^12
M_sun/h in a large cosmological simulation show similar scale-dependent
alignment signals to the observation, but with higher amplitudes at all scales
probed. We show that this discrepancy may be partially explained by a
misalignment angle between central galaxies and their host halos, though
detailed modeling is needed in order to better understand the link between the
orientations of galaxies and host halos. In addition, we find systematic trends
of the alignment statistics with the stellar mass of the CMASS galaxies, in the
sense that more massive galaxies are more strongly aligned with the large-scale
structure.Comment: 6 pages, 3 figures, accepted for publication in ApJ Letter
Topological superfluid in a fermionic bilayer optical lattice
In this paper, a topological superfluid phase with Chern number C=1
possessing gapless edge states and non-Abelian anyons is designed in a C=1
topological insulator proximity to an s-wave superfluid on an optical lattice
with the effective gauge field and layer-dependent Zeeman field coupled to
ultracold fermionic atoms pseudo spin. We also study its topological properties
and calculate the phase stiffness by using the random-phase-approximation
approach. Finally we derive the temperature of the Kosterlitz-Thouless
transition by means of renormalized group theory. Owning to the existence of
non-Abelian anyons, this C=1 topological superfluid may be a possible candidate
for topological quantum computation.Comment: 15 pages, 8 figure
Apigenin exerts anticancer effects on human cervical cancer cells via induction of apoptosis and regulation of Raf/MEK/ERK signalling pathway
Purpose: To investigate the anticancer activity of apigenin on human cervical cancer cells.Methods: The anti-proliferative effects of apigenin on HeLa cervical cancer cells were determined by 3-(4,5-dimethylthiazol-2-yl)- )-2,5-diphenyltetrazolium bromide (MTT) and clonogenic assays, while its effect on apoptosis was assayed by DAPI and annexin V/PI double staining. Expression of proteins was assessed by immunoblotting.Results: Apigenin exerted anticancer effects on HeLa cervical cancer cells with an IC50 of 15 ÎŒM, and also reduced the colony formation of HeLa cells. These antiproliferative effects were due to induction of apoptosis as indicated by DAPI and annexin V/PI staining. Apigenin altered Bax/Bcl-2 ratio, thereby triggering apoptosis, and also inhibited the Raf/MEK/ERK signalling pathway.Conclusion: These results indicate that apigenin suppresses the growth of cervical cancer cells and may prove to be an important molecule for the treatment of cervical cancer.Keywords: Cervical cancer, Apigenin, Apoptosis, Ba
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