89 research outputs found
Renal oncocytoma: a comparative clinicopathologic study and fluorescent in-situ hybridization analysis of 73 cases with long-term follow-up
Clinical studies have confirmed that renal oncocytoma (RO) is a benign neoplasm with excellent prognosis. In diagnostically challenging cases of renal oncocytic epithelial neoplasms, fluorescent in-situ hybridization (FISH) is increasingly being used and its ability to distinguish RO from chromophobe renal cell carcinoma (ChRCC) has been documented. In this study, we evaluated the differential diagnostic contribution of FISH in cases of RO
Latest results for the antikaon-nucleon optical potential
The key question of this letter is whether the K-nucleus optical potential is
deep, as it is prefered by the phenomenological fits to kaonic atoms data, or
shallow, as it comes out from unitary chiral model calculations. The current
experimental situation is reviewed.Comment: 3 pages, 1 figure. Presented at the 21st European Conference on the
Few-Body problems in Physics (EFB21), Salamanca, Spain, August 29 - September
3, 201
Elastic Pion Scattering on the Deuteron in a Multiple Scattering Model
Pion elastic scattering on deuterium is studied in the KMT multiple
scattering approach developed in momentum space. Using a Paris wave function
and the same methods and approximations as commonly used in pion scattering on
heavier nuclei excellent agreement with differential cross section data is
obtained for a wide range of pion energies. Only for MeV and very
backward angles, discrepancies appear that are reminiscent of disagreements in
pion scattering on He, H, and He. At low energies the second order
corrections have been included. Polarization observables are studied in detail.
While tensor analyzing powers are well reproduced, vector analyzing powers
exhibit dramatic discrepancies.Comment: 25 pages LATEX and 9 postscript figures in a self-extracting uufile
archiv
Seroprevalence of HCV, HBV and HIV in two inner-city London Emergency Departments.
Summary: In this paper we build on work investigating the feasibility of human immunodeficiency virus (HIV) testing in emergency departments (EDs), estimating the prevalence of
hepatitis B, C and HIV infections among persons attending two inner-London EDs, identifying factors associated with testing positive in an ED. We also undertook molecular characterisation to look at the diversity of the viruses circulating in these individuals, and the presence
of clinically significant mutations which impact on treatment and control.
Blood-borne virus (BBV) testing in non-traditional settings is feasible, with emergency
departments (ED) potentially effective at reaching vulnerable and underserved populations.
We investigated the feasibility of BBV testing within two inner-London EDs. Residual samples
from biochemistry for adults (⩾18 years) attending The Royal Free London Hospital (RFLH)
or the University College London Hospital (UCLH) ED between January and June 2015 were
tested for human immunodeficiency virus (HIV)Ag/Ab, anti-hepatitis C (HCV) and HBsAg.
PCR and sequence analysis were conducted on reactive samples. Sero-prevalence among persons attending RFH and UCLH with residual samples (1287 and 1546), respectively, were
1.1% and 1.0% for HBsAg, 1.6% and 2.3% for anti-HCV, 0.9% and 1.6% for HCV RNA,
and 1.3% and 2.2% for HIV. For RFH, HBsAg positivity was more likely among persons of
black vs. white ethnicity (odds ratio 9.08; 95% confidence interval 2.72–30), with anti-HCV
positivity less likely among females (0.15, 95% CI 0.04–0.50). For UCLH, HBsAg positivity
was more likely among non-white ethnicity (13.34, 95% CI 2.20–80.86 (Asian); 8.03, 95%
CI 1.12–57.61 (black); and 8.11, 95% CI 1.13–58.18 (other/mixed)). Anti-HCV positivity
was more likely among 36–55 year olds vs. ⩾56 years (7.69, 95% CI 2.24–26.41), and less likely
among females (0.24, 95% CI 0.09–0.65). Persons positive for HIV-markers were more likely
to be of black vs. white ethnicity (4.51, 95% CI 1.63–12.45), and less likely to have one ED
attendance (0.39, 95% CI 0.17–0.88), or female (0.12, 95% CI 0.04–0.42). These results indicate that BBV-testing in EDs is feasible, providing a basis for further studies to explore provider and patient acceptability, referral into care and cost-effectiveness
Pion interaction with the trinucleon up to the eta production threshold
Pion elastic, charge exchange scattering and induced eta production on the
trinucleon systems are investigated in a coupled-channels approach in momentum
space with Fadeev wave functions. The channel is
included using an isobar model with S-, P-, and D-wave resonances. While the
coherent reactions like He(He can be reasonably well reproduced
up to =500 MeV, large discrepancies appear for the incoherent
processes, He(H and He(H at backward
angles and energies above -resonance. In the forward direction the
calculations underestimate the experimental measurements very
close to threshold but agreement with the data improves with increasing pion
energy. Predictions are made for the asymmetries of the various reactions on
polarized He.Comment: 40 pages, 12 figures (available from the authors), Mainz preprint
MKPH-T-92-1
The reaction on p-shell nuclei
This letter is concerned with the study of the reaction in p-shell nuclei, i.e., , ,
and . The emission rates are
reported as a function of . These rates are discussed in comparison with
previous findings. The ratio in p-shell nuclei is
found to depart largely from that on hydrogen, which provides support for large
in-medium effects possibly generated by the sub-threshold . The
continuum momentum spectra of prompt pions and free sigmas are also discussed
as well as the missing mass behavior and the link with the
reaction mechanism. The apparatus used for the investigation is the FINUDA
spectrometer operating at the DANE -factory (LNF-INFN, Italy).Comment: 14 pages, 5 figures, accepted for publication in Phys. Lett.
Correlated pairs from the reaction
Correlated pairs emitted after the absorption of negative kaons
at rest in light nuclei and are
studied. -hyperons and deuterons are found to be preferentially
emitted in opposite directions. The invariant mass spectrum of
shows a bump whose mass is 32516 MeV/c. The bump mass (binding
energy), width and yield are reported. The appearance of a bump is discussed in
the realm of the [] clustering process in nuclei. The experiment was
performed with the FINUDA spectrometer at DANE (LNF).Comment: 13 pages, 5 figures, accepted for publication in Phys. Lett.
Strangeness Production close to Threshold in Proton-Nucleus and Heavy-Ion Collisions
We discuss strangeness production close to threshold in p+A and A+A
collision. Comparing the body of available K+, K0, K-, and Lambda data with the
IQMD transport code and for some key observables as well with the HSD transport
code, we find good agreement for the large majority of the observables. The
investigation of the reaction with help of these codes reveals the complicated
interaction of the strange particles with hadronic matter which makes
strangeness production in heavy-ion collisions very different from that in
elementary interactions. We show how different strange particle observables can
be used to study the different facets of this interaction (production,
rescattering and potential interaction) which finally merge into a
comprehensive understanding of these interactions. We identify those
observables which allow for studying (almost) exclusively one of these
processes to show how future high precision experiments can improve our
quantitative understanding. Finally, we discuss how the K+ multiplicity can be
used to study the hadronic equation of state.Comment: 134 pages, pdf 3.3MB, version to be published in Physics Report
The K^- \alpha scattering length and the reaction dd \to \alpha K^+ K^-
We present predictions for the the K^- \alpha scattering length obtained
within the framework of the multiple scattering approach. Evaluating the pole
position of the K^- \alpha scattering amplitude within the zero range
approximation, we find a loosely bound K^- \alpha state with a binding energy
of E_R = -2 ... -7 MeV and a width \Gamma_R = 11 ... 18 MeV. We propose to
measure the K^- \alpha scattering length through the final state interaction
between the \alpha and K^- meson produced in the reaction dd \to \alpha K^+
K^-. It is found that the K^-\alpha invariant mass distribution from this
reaction at energies near the threshold provides a new tool to determine the
s-wave K^- \alpha scattering length.Comment: 6 pages, 3 PS figure
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