664 research outputs found
(1,10-Phenanthroline-κ2 N,N′)(triphenylÂphosphine-κP)silver(I) trifluoroÂmethaneÂsulfonate
The structure of the title complex, [Ag(C12H8N2)(C18H15P)]CF3SO3, is based on a distorted trigonal–planar N2P coordination of the AgI ion, provided by two N atoms of the bidentate phenanthroline ligand and one P atom of the triphenylÂphosphine ligand. The phenanthroline ligand and one phenyl ring of the triphenylÂphosphine ligand almost lie in one plane (maximum deviation = 0.014 Å from the best planes). The crystal structure may be stabilized by an interÂmolecular C—H⋯O hydrogen bond between the phenanthroline ligand and the O atom of the trifluoroÂmethaneÂsulfonate anion
Urinary paraquat concentration and white blood cell count as prognostic factors in paraquat poisoning
Purpose: To investigate the effect of white blood cell (WBC) and urinary paraquat (PQ) levels on prognostic factors in patients exposed to PQ intoxication using multivariate logistic regression analysis.Methods: A total of 104 subjects intoxicated with PQ between December 2015 and July 2016 were used in this retrospective study. They comprised patients who survived (n = 78), and patients who died (n = 26). Clinical features and prognostic parameters were analyzed in both groups. Multivariate logistic regression analysis was used to establish a prognostic correlation model based on results from single factor variables.Results: Comparison of demographic and clinical attributes between the two groups, survivors (n = 78) and non-survivors (n = 26), revealed that those who survived were not as old (33.3 ± 9.9 years) as nonsurvivors (41.5 ± 12.9 years). In addition, on admission, it was found that the survivors ingested lower amounts of PQ (31.6 ± 13.8 ml) than non-survivors (67.88 ± 31.2 ml). There were significant differences between the two groups with respect to WBC, neutrophils, lymphocytes, lactate dehydrogenase (LDH), creatine kinase (CK), amylase, uric acid (UA), pH, partial pressure of oxygen (PaO2), base excess (BE), lactic acid, and D-dimer levels (p < 0.05).Conclusion: WBC and urine PQ concentration have strong correlation with prognostic factors in PQ poisoning.Keywords: Paraquat intoxication, Dithionite test, Multivariate logistic analysis, Prognosis, Predictor
5 GHz TMRT observations of 71 pulsars
We present integrated pulse profiles at 5~GHz for 71 pulsars, including eight
millisecond pulsars (MSPs), obtained using the Shanghai Tian Ma Radio Telescope
(TMRT). Mean flux densities and pulse widths are measured. For 19 normal
pulsars and one MSP, these are the first detections at 5~GHz and for a further
19, including five MPSs, the profiles have a better signal-to-noise ratio than
previous observations. Mean flux density spectra between 400~MHz and 9~GHz are
presented for 27 pulsars and correlations of power-law spectral index are found
with characteristic age, radio pseudo-luminosity and spin-down luminosity. Mode
changing was detected in five pulsars. The separation between the main pulse
and interpulse is shown to be frequency independent for six pulsars but a
frequency dependence of the relative intensity of the main pulse and interpulse
is found. The frequency dependence of component separations is investigated for
20 pulsars and three groups are found: in seven cases the separation between
the outmost leading and trailing components decreases with frequency, roughly
in agreement with radius-to-frequency mapping; in eleven cases the separation
is nearly constant; in the remain two cases the separation between the outmost
components increases with frequency. We obtain the correlations of pulse widths
with pulsar period and estimate the core widths of 23 multi-component profiles
and conal widths of 17 multi-component profiles at 5.0~GHz using Gaussian
fitting and discuss the width-period relationship at 5~GHz compared with the
results at at 1.0~GHz and 8.6~GHz.Comment: 46 pages, 14 figures, 8 Tables, accepted by Ap
Study on wind resistance coefficient of double split wire arrangement
Shape coefficients of a single traverse and twin branch lines are examined through wind tunnel experiments and numerical simulations under different angle of attacks and wind speeds. It was found that the shape coefficient at angle of attack equaling to 0 is obviously smaller than the others. And the effects of Reynolds number are also large. The numerical results give difference between cases reaching 20Â %, however, the experimental ones only 1.17Â %. It is because that the initial condition of CFD is idealized but the wind tunnel experiment is closer to the reality
Herbivores Alleviate the Negative Effects of Extreme Drought on Plant Community by Enhancing Dominant Species
Aims
Both extreme drought and insect herbivores can suppress plant growth in grassland communities. However, most studies have examined extreme drought and insects in isolation, and there is reason to believe that insects might alter the ability of grasslands to withstand drought. Unfortunately, few studies have tested the interactive effects of extreme drought and insect herbivores in grassland communities.
Methods
Here, we tested the drought–herbivore interactions using a manipulative experiment that factorially crossed extreme drought with the exclusion of insect herbivores in a temperate semiarid grassland in Inner Mongolia.
Important Findings
Our results demonstrated that both extreme drought and insect herbivores separately decreased total plant cover. When combined, insect herbivores reduced the impact of drought on total cover by increasing the relative abundance of drought-resistant dominant species. Our results highlight that the negative effect of extreme drought on total plant cover could be alleviated by maintaining robust insect herbivore communities
Expression of COX-2 and Bcl-2 in primary fallopian tube carcinoma: correlations with clinicopathologic features
The aim of this study was to evaluate the expression of COX-2 and Bcl-2 in primary fallopian tube
carcinoma (PFTC), as well as their correlations with clinicopathologic features. We studied a cohort of 33 patients
with a pathological diagnosis of PFTC. Thirty normal tubal tissues used for controls were obtained from
patients diagnosed with uterine myomas. Expression analysis for COX-2 and Bcl-2 was performed using the
immunohistochemical technique. The rate of preoperative diagnosis was 18.2%. With a median survival of 61.0
months (95% CI: 43.2 to 78.8 months), the estimated five-year overall survival rate in the 33 patients was 39.0%.
Increased expression of COX-2 and Bcl-2 was observed in tumor specimens compared to normal controls
(p = 0.026; p = 0.003). The expression rate of COX-2 in node-positive tumors was significantly higher than that
of node-negative tumors (p = 0.024). Moreover, the expression rate of COX-2 was statistically significantly
higher in patients with infiltration through the serosa (p = 0.019). Positive significant associations were observed
between Bcl-2 staining index and FIGO stage (p = 0.015), and between Bcl-2 staining and lymph node
metastasis (p = 0.010). There was a significant correlation between COX-2 expression and Bcl-2 staining index
(r = 0.517, p = 0.002). We conclude that COX-2 and Bcl-2 may potentially be useful prognostic markers for
PFTC. The exact molecular mechanism for correlations between COX-2 and Bcl-2 remains to be elucidated.
(Folia Histochemica et Cytobiologica 2011, Vol. 49, No. 3, 389–397
Vortex Dynamics in Rotating Rayleigh-B\'enard Convection
We investigate the spatial distribution and dynamics of the vortices in
rotating Rayleigh-B\'enard convection in a reduced Rayleigh-number range
. Under slow rotations (), the
vortices are randomly distributed. The size-distribution of the Voronoi cells
of the vortex centers is well described by the standard distribution.
In this flow regime the vortices exhibit Brownian-type horizontal motion. The
probability density functions of the vortex displacements are, however,
non-Gaussian at short time scales. At modest rotating rates
() the centrifugal force leads to radial
vortex motions, i.e., warm cyclones (cold anticyclones) moving towards (outward
from) the rotation axis. The mean-square-displacements of the vortices increase
faster than linearly at large time. This super-diffusive behavior can be
satisfactorily explained by a Langevin model incorporating the centrifugal
force. In the rapidly rotating regime () the
vortices are densely distributed, with the size-distribution of their Voronoi
cells differing significantly from the standard distribution. The
hydrodynamic interaction of neighboring vortices results in formation of vortex
clusters. Inside clusters the correlation of the vortex velocity fluctuations
is scale free, with the correlation length being approximately of the
cluster length. We examine the influence of cluster forming on the dynamics of
individual vortex. Within clusters, cyclones exhibit inverse-centrifugal motion
as they submit to the motion of strong anticyclones, while the velocity for
outward motion of the anticyclones is increased. Our analysis show that the
mobility of isolated vortices, scaled by their vorticity strength, is a simple
power function of the Froude number
- …