2,599 research outputs found
Angular distributions in the radiative decays of the state of charmonium originating from polarized collisions
Using the helicity formalism, we calculate the combined angular distribution
function of the two gamma photons ( and ) and the electron
() in the triple cascade process
, when and
are arbitrarily polarized. We also derive six different partially integrated
angular distribution functions which give the angular distributions of one or
two particles in the final state. Our results show that by measuring the
two-particle angular distribution of and and that of
and , one can determine the relative magnitudes as well as the
relative phases of all the helicity amplitudes in the two charmonium radiative
transitions and .Comment: arXiv admin note: substantial text overlap with arXiv:1311.464
Angular distributions of the polarized photons and electron in the decays of the state of charmonium
We calculate the combined angular distribution functions of the polarized
photons ( and ) and electron () produced in the
cascade process
, when the
colliding and are unpolarized. Our results are independent of any
dynamical models and are expressed in terms of the spherical harmonics whose
coefficients are functions of the angular-momentum helicity amplitudes of the
individual processes. Once the joint angular distribution of (,
) and that of (, ) with the polarization of either one
of the two particles are measured, our results will enable one to determine the
relative magnitudes as well as the relative phases of all the angular-momentum
helicity amplitudes in the radiative decay processes
and
A computer-enhanced pH study of the formaldehyde–sulphite clock reaction
The formaldehyde-sulphite clock reaction was studied using an
Orion SA 720 pH/ISE meter interfaced to an IBM PC. The
laboratory software ‘ASYST’ was employed to facilitate data
acquisition and data treatment. Experimental pH profiles thus
obtained for the first time were simulated by invoking a theoretical
model based on the reaction mechanism suggested by Burnett [1].
The variation of rate constants with compositions of reaction
mixtures was also discuseed in light of the empirical expression
proposed by Bell and Evans [2] for instantaneous rate constant of
the clock reaction
Preliminary Observations on the Effects In Vivo and In Vitro of Low Dose Laser on the Epithelia of the Bladder, Trachea and Tongue of the Mouse
The effects of low dose CW laser were studied by in vivo and in vitro systems. The experimental tissues that were used included bladders, tracheas and tongues as experimental tissues. Buddings (round surface projections) from the transitional epithelium of bladder were frequently observed 3 days after laser treatment in both in vivo and in vitro systems. The trachea and tongue were less affected. In both the in vivo and in vitro systems, some epithelial cells of the trachea showed decreased microvilli and cilia 3 days after treatment whereas the epithelial cells of the tongue revealed no response to laser treatment in both systems. Low dose laser, however, appeared to promote the rate of healing of experimental tongue ulcer: healing was about 1 day earlier in the laser treated than non-treated animals and vessel infiltration and epithelialization were detected earlier in the treated
Auto-FACE: An NMR Based Binding Site Mapping Program for Fast Chemical Exchange Protein-Ligand Systems
10.1371/journal.pone.0008943PLoS ONE52
Stimulation of Collagen Formation in the Intestinal Anastomosis by Low Dose He-Ne Laser
The effect of low dose He-Ne laser on the healing of intestinal anastomosis was studied in the albino rat. A small piece of jejunum was removed from each rat and the ends sutured back with a simple interrupted pattern. In the experimental animal, the anastomosis was Irradiated through an optic fiber with a He-Ne laser (1 mW) for 15 minutes whereas in the control animal, the anastomosis was not irradiated. The differences between the two groups were compared by histology, transmission electron microscopy, scanning electron microscopy and autoradiography 3 and 7 days after operation. The laser treated experimental animals demonstrated thicker collagen fibers and an increased quantity of collagen at the junction of the anastomosis compared to control animals. Increased uptake of labelled proline was also evident in the laser treated animals. These observations all point to a possible enhancement of collagen synthesis triggered by laser irradiation
Non-ancient solution of the Ricci flow
For any complete noncompact Khler manifold with nonnegative and
bounded holomorphic bisectional curvature,we provide the necessary and
sufficient condition for non-ancient solution to the Ricci flow in this paper.Comment: seven pages, latex fil
The Microvasculature of Human Oral Mucosa Using Vascular Corrosion Casts and India Ink Injection I. Tongue Papillae
The microvasculature of human tongue papillae originating from 9 males and 6 females, aged 0.5 to 2 years was studied by scanning electron microscopy (SEM) of vascular corrosion casts and by light microscopy (LM) of India ink injected specimens. All papillae showed a microvasculature characterized by primary, secondary and tertiary capillary loops. In the filiform papillae the loops were generally arranged in a corolla-like pattern with the tertiary loops demonstrating a hair-pin shape. The fungiform papillae showed basically a similar architectural pattern although the loops were somewhat more compact and complex in structure. A small, shallow depression of the tertiary loops at the top of these papillae was found to be occupied by a prominent rete ridge of the surface epithelium. There was a gradual transition from filiform to foliate papillae, the latter appearing as rows of coalesced filiform papillae. The circumvallate papillae easily identified by the surrounding furrow showed a rather complex and compact pattern of capillary loops of which typical hair-pin shaped tertiary loops dominated the periphery of the papilla. Small grooves or depressions in the vascular network were found to be occupied by rete ridges of the overlying mucosal epithelium
Association of BANK1 and TNFSF4 with systemic lupus erythematosus in Hong Kong Chinese
Systemic lupus erythematosus (SLE) is a prototypic autoimmune disease with complex genetic inheritance. Recently, single nucleotide polymorphisms (SNPs) in BANK1 and TNFSF4 have been shown to be associated with SLE in Caucasian populations, but it is not known whether they are also involved in the disease in other ethnic groups. Recent data from our genome-wide association study (GWAS) for 314 SLE cases and 920 controls collected in Hong Kong identified SNPs in and around BANK1 and TNFSF4 to be associated with SLE risk. On the basis of the results of the reported studies and our GWAS, SNPs were selected for further genotyping in 949 SLE patients (overlapping with the 314 cases in our GWAS) and non-overlapping 1042 healthy controls. We confirmed the associations of BANK1 and TNFSF4 with SLE in Chinese (BANK1, rs3733197, odds ratio (OR)=0.84, P=0.021; BANK1, rs17266594, OR=0.61, P=4.67 × 10−9; TNFSF4, rs844648, OR=1.22, P=2.47 × 10−3; TNFSF4, rs2205960, OR=1.30, P=2.41 × 10−4). Another SNP located in intron 1 of BANK1, rs4522865, was separately replicated by Sequenom in 360 cases and 360 controls and was also confirmed to be associated with SLE (OR=0.725, P=2.93 × 10−3). Logistic regression analysis showed that rs3733197 (A383T in ankyrin domain) and rs17266594 (a branch point-site SNP) from BANK1 had independent contributions towards the disease association (P=0.037 and 6.63 × 10−8, respectively). In TNFSF4, rs2205960 was associated with SLE independently from the effect of rs844648 (P=6.26 × 10−3), but not vice versa (P=0.55). These findings suggest that multiple independent genetic variants may be present within the gene locus, which exert their effects on SLE pathogenesis through different mechanisms
- …