1,450 research outputs found
Pole analysis on the hadron spectroscopy of
In this paper we study the spectroscopy in the process of
. The final state interactions of coupled channel
~-~ ~-~ are constructed
based on K-matrix with the Chew-Mandelstam function. We build the amplitude according to the Au-Morgan-Pennington method. The event
shape is fitted and the decay width of is used to
constrain the parameters, too. With the amplitudes we extract out the poles and
their residues. Our amplitude and pole analysis suggest that the
should be molecule, the could be an S-wave
compact pentaquark state, and the structure around is caused by the
cusp effect. The future experimental measurement of the decays of and would further
help to study the nature of these resonances.Comment: updated to the published versio
Triaqua-1κO,2κ2 O-bis(2,2′-bipyridine)-1κ2 N,N′;2κ2 N,N′-chlorido-1κCl-μ-terephthalato-1:2κ2 O 1:O 4-dicopper(II) nitrate monohydrate
In the binuclear title compound, [Cu2(C8H4O4)Cl(C10H8N2)2(H2O)3]NO3·H2O, the two crystallographically independent CuII ions have similar coordination environments. One of the CuII ions has a square-pyramidal arrangement, which is defined by a water molecule occupying the apical position, with the equatorial ligators consisting of two N atoms from a 2,2′-bipyridine molecule, one carboxylate O atom from a terephthalate ligand and one O atom from a water molecule. The other CuII ion has a similar coordination environment, except that the apical position is occupied by a chloride ligand instead of a water molecule. An O—H⋯O and O—H⋯Cl hydrogen-bonded three-dimensional network is formed between the components
Dichlorido(4′-ferrocenyl-2,2′:6′,2′′-terpyridine-κ3 N,N′,N′′)zinc acetonitrile monosolvate
The title complex, [FeZn(C5H5)Cl2(C20H14N3)]·CH3CN, is composed of one ZnII atom, one 4′-ferrocenyl-2,2′:6′,2′′-terpyridine (fctpy) ligand, two Cl atoms and one acetonitrile solvent molecule. The ZnII atom is five-coordinated in a trigonal–bipyramidal geometry by the tridentate chelating fctpy ligand and two Cl atoms
Heme oxygenase-1 plays a pro-life role in experimental brain stem death via nitric oxide synthase I/protein kinase G signaling at rostral ventrolateral medulla
<p>Abstract</p> <p>Background</p> <p>Despite its clinical importance, a dearth of information exists on the cellular and molecular mechanisms that underpin brain stem death. A suitable neural substrate for mechanistic delineation on brain stem death resides in the rostral ventrolateral medulla (RVLM) because it is the origin of a life-and-death signal that sequentially increases (pro-life) and decreases (pro-death) to reflect the advancing central cardiovascular regulatory dysfunction during the progression towards brain stem death in critically ill patients. The present study evaluated the hypothesis that heme oxygnase-1 (HO-1) may play a pro-life role as an interposing signal between hypoxia-inducible factor-1 (HIF-1) and nitric oxide synthase I (NOS I)/protein kinase G (PKG) cascade in RVLM, which sustains central cardiovascular regulatory functions during brain stem death.</p> <p>Methods</p> <p>We performed cardiovascular, pharmacological, biochemical and confocal microscopy experiments in conjunction with an experimental model of brain stem death that employed microinjection of the organophosphate insecticide mevinphos (Mev; 10 nmol) bilaterally into RVLM of adult male Sprague-Dawley rats.</p> <p>Results</p> <p>Western blot analysis coupled with laser scanning confocal microscopy revealed that augmented HO-1 expression that was confined to the cytoplasm of RVLM neurons occurred preferentially during the pro-life phase of experimental brain stem death and was antagonized by immunoneutralization of HIF-1α or HIF-1β in RVLM. On the other hand, the cytoplasmic presence of HO-2 in RVLM neurons manifested insignificant changes during both phases. Furthermore, immunoneutralization of HO-1 or knockdown of <it>ho-1 </it>gene in RVLM blunted the augmented life-and-death signals exhibited during the pro-life phase. Those pretreatments also blocked the upregulated pro-life NOS I/PKG signaling without affecting the pro-death NOS II/peroxynitrite cascade in RVLM.</p> <p>Conclusions</p> <p>We conclude that transcriptional upregulation of HO-1 on activation by HIF-1 in RVLM plays a preferential pro-life role by sustaining central cardiovascular regulatory functions during brain stem death via upregulation of NOS I/PKG signaling pathway. Our results further showed that the pro-dead NOS II/peroxynitrite cascade in RVLM is not included in this repertoire of cellular events.</p
Poly[[[bis(acetato-κO)copper(II)]-μ-1,4-diimidazol-1-ylbenzene-κ2 N 3:N 3′] dihydrate]
In the title linear coordination polymer, {[Cu(C2H3O2)2(C12H10N4)]·2H2O}n, the CuII atom is coordinated by two N atoms from two different symmetry-related 1,4-diimidazol-1-ylbenzene (dib) ligands and two carboxylate O atoms from two acetate ligands in a square-planar geometry. The Cu atoms are linked by the dib ligands, forming an extended chain. These chains are linked by O—H⋯O hydrogen bonds into a three-dimensional supramolecular network. The CuII atom lies on a center of inversion
Constructing a precipitable water vapor map from regional GNSS network observations without collocated meteorological data for weather forecasting
Surface pressure (Ps) and weighted mean temperature
(Tm) are two necessary variables for the accurate retrieval of
precipitable water vapor (PWV) from Global Navigation Satellite System (GNSS)
zenith total delay (ZTD) estimates. The lack of Ps or Tm
information is a concern for those GNSS sites that are not collocated with
meteorological sensors. This paper investigates an alternative method of
inferring accurate Ps and Tm at the GNSS station using
nearby synoptic observations. Ps and Tm obtained at the
nearby synoptic sites are interpolated onto the location of the GNSS station by
performing both vertical and horizontal adjustments, in which the parameters
involved in Ps and Tm calculation are estimated from
ERA-Interim reanalysis profiles. In addition, we present a method of
constructing high-quality PWV maps through vertical reduction and horizontal
interpolation of the retrieved GNSS PWVs. To evaluate the performances of the
Ps and Tm retrieval, and the PWV map construction, GNSS
data collected from 58 stations of the Hunan GNSS network and synoptic
observations from 20 nearby sites in 2015 were processed to extract the PWV
so as to subsequently generate the PWV maps. The retrieved Ps and
Tm and constructed PWV maps were assessed by the results derived
from radiosonde and the ERA-Interim reanalysis. The results show that
(1) accuracies of Ps and Tm derived by synoptic
interpolation are within the range of 1.7–3.0 hPa and 2.5–3.0 K,
respectively, which are much better than the GPT2w model; (2) the constructed
PWV maps have good agreements with radiosonde and ERA-Interim reanalysis data
with the overall accuracy being better than 3 mm; and (3) PWV maps can well
reveal the moisture advection, transportation and convergence during heavy
rainfall.</p
Nature of the in partial wave decomposition of scattering
In this letter, we perform partial wave decomposition on coupled channel
scattering amplitudes, --,
to study the resonance appears in these processes. Effective Lagrangians are
used to describe the interactions of four charmed vector mesons, and the
scattering amplitudes are calculated up to the next-to-leading order. Partial
wave projections are performed, and unitarization is implemented by Pad\'e
approximation. Then we fit the amplitudes to the invariant mass
spectra measured by LHCb and determine the unknown couplings. The pole
parameters of the are extracted as ~MeV and
~MeV. Our analysis implies that its quantum number
prefers to be . The pole counting rule and phase shifts show that it is
a normal Breit-Wigner resonance and hence should be a compact tetraquark.Comment: 6 pages, 4 figure
Transactive Memory System, Job Competence and Individual Performance
The purpose of this paper is to understand important variables that impact individual performance within a team. This will enhance knowledge management within a team context and facilitate competence development of individuals. This research proposes and examines a multi-level model which elaborates how transactive memory system and job competence (i.e., technology competence and teamwork competence) affect individual performance. An empirical study was conducted with 19 teams of television news reporters, with 211 valid survey responses. Hierarchical linear modeling was applied to analyze the data. The result indicated that transactive memory system and technology competence helped to improve a reporter’s job performance. Furthermore, the relationships were fully mediated by teamwork competence. Our findings thus suggest teamwork competence is the core. Neither technology competence nor transactive memory system will necessarily translate directly into enhanced individual performance. Therefore, for organizational investment on transactive memory system and digital technologies to take effect, management should help develop the employee’s teamwork competence
DAMA/NaI results
The DAMA/NaI set-up of the DAMA experiment has been operative during seven
annual cycles and has investigated several rare processes. In particular, it
has been realised in order to investigate the model independent annual
modulation signature for Dark Matter particles in the galactic halo. With the
total exposure collected in the seven annual cycles (107731 kg day) a model
independent evidence for the presence of a Dark Matter particle component in
the galactic halo has been pointed out at 6.3 sigma C.L.. Some of the many
possible corollary model dependent quests for the candidate particle have been
presented as well.Comment: Contributed paper to the Rencontres de Moriond "Electroweak
Interactions and Unified Theories", La Thuile, Aosta Valley, Italy, March
200
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