Summary
The study was performed to determine factors affecting successful sperm retrieval by testicular sperm extraction in patients with nonmosaic Klinefelter’s syndrome (KS). From May 2001 to ...February 2007, 27 azoospermic patients were diagnosed as having nonmosaic KS. All patients underwent sperm testicular extraction. Patient’s age, testicular volume, serum follicle‐stimulating hormone (FSH) and inhibin B were assessed as predictive factors for successful sperm recovery. Of the 27 Klinefelter’s patients examined, eight (29.6%) had successful sperm recovery. The comparisons of serum FSH, inhibin B and testicular volume between patients with and without successful sperm retrieval did not show any statistical significance. The patients with successful sperm recovery were significantly younger (28.6 ± 3.11 years) than those with failed attempts (33.9 ± 4.5 years, P = 0.002). The rate of positive sperm retrieval was significantly higher in patients younger than 32 years compared with patients older than 32 years (P = 0.01, chi‐squared test). The study showed that clinical parameters such as FSH, inhibin B and testicular volume do not have predictive value for sperm recovery in patients with KS. The mean age of our patients with successful sperm recovery was significantly lower than that of men with unsuccessful results. Testicular sperm extraction or testicular sperm aspiration should be performed before the critical age of 32 years.
A
bstract
A comprehensive set of azimuthal single-spin and double-spin asymmetries in semi-inclusive leptoproduction of pions, charged kaons, protons, and antiprotons from transversely polarized ...protons is presented. These asymmetries include the previously published HERMES results on Collins and Sivers asymmetries, the analysis of which has been extended to include protons and antiprotons and also to an extraction in a three-dimensional kinematic binning and enlarged phase space. They are complemented by corresponding results for the remaining four single-spin and four double-spin asymmetries allowed in the one-photon-exchange approximation of the semi-inclusive deep-inelastic scattering process for target-polarization orientation perpendicular to the direction of the incoming lepton beam. Among those results, significant non-vanishing cos (
ϕ−ϕ
S
) modulations provide evidence for a sizable worm-gear (II) distribution,
g
1
T
q
x
p
T
2
. Most of the other modulations are found to be consistent with zero with the notable exception of large sin (
ϕ
S
) modulations for charged pions and
K
+
.
Single-spin asymmetries for pions and charged kaons are measured in semi-inclusive deep-inelastic scattering of positrons and electrons off a transversely nuclear-polarized hydrogen target. The ...dependence of the cross section on the azimuthal angles of the target polarization (ϕS) and the produced hadron (ϕ) is found to have a substantial sin(ϕ+ϕS) modulation for the production of π+, π− and K+. This Fourier component can be interpreted in terms of non-zero transversity distribution functions and non-zero favored and disfavored Collins fragmentation functions with opposite sign. For π0 and K− production the amplitude of this Fourier component is consistent with zero.
It is carried out a comparison between the experimental data of the YerPhI-KhPhTI-SLAC collaboration on radiation of 6 and 10GeV positrons channeled in the (110) crystallographic planes of diamond ...with thicknesses 600 and 84μm, correspondingly, and theory taking into account the medium polarization. It is shown that the theory with medium polarization describes the experimental results better than other theories without medium polarization.
A
bstract
Beam-helicity and beam-charge asymmetries in the hard exclusive leptoproduction of real photons from an unpolarised hydrogen target by a 27.6 GeV lepton beam are extracted from the H
ermes
...data set of 2006-2007 using a missing-mass event selection technique. The asymmetry amplitudes extracted from this data set are more precise than those extracted from the earlier data set of 1996-2005 previously analysed in the same manner by H
ermes
. The results from the two data sets are compatible with each other. Results from these combined data sets are extracted and constitute the most precise asymmetry amplitude measurements made in the H
ermes
kinematic region using a missing-mass event selection technique.
Double-spin asymmetries in exclusive electroproduction of real photons from a transversely polarized hydrogen target are measured with respect to the product of target polarization with beam helicity ...and beam charge, and with respect to the product of target polarization with beam helicity alone. The asymmetries arise from the deeply virtual Compton scattering process and its interference with the Bethe–Heitler process. They are related to the real part of the same combination of Compton form factors as that determining the previously published transverse target single-spin asymmetries through the imaginary part. The results for the double-spin asymmetries are found to be compatible with zero within the uncertainties of the measurement, and are not incompatible with the predictions of the only available GPD-based calculation.
To determine the diagnostic value of ultrasonography and its capabilities in evaluating the involvement of abdominal organs and peripheral lymph nodes, in analyzing the morphological subtypes in ...lymphomas, in choose the lymph node that is most informative for a histological study.
193 patients with lymphomas, including 85 (44%) with lymphogranulomatosis and 108 (56%) with non-Hodgkin's lymphomas who had been treated at the clinical units of the Prof. R.O. Eolyan Hematology Center, Ministry of Health of the Republic of Armenia, in 2006-2009 were examined. Their ultrasound examination was made using Aloka SSD500 apparatuses with 3.5--and 5.0 MHz convex transducers, a Medison SA6000 probe with a 7.0 MHz C3-7ED linear transducer and a 3.5 MHz HL5-9ED convex transducer, an Acuson probe with a 7.0 MHz linear transducer and a 3.5 MHz convex transducer, by applying polyposition gray-scale scanning (B mode) and real-time color Doppler flow mapping.
The patients with lymphomas were clinically characterized; data on the nature and extent of the involvements of different anatomic groups of lymph nodes, organs, and systems (spleen, liver, thyroid, etc.) are given.
B-mode ultrasonography is an essential component of a comprehensive diagnostic examination in patients with lymphomas. It is important to detect primary lesion foci and to estimate their distribution and extent in the nodal and extranodal organs and systems, mediastinum in the ultrasound diagnosis of lymphomas.
The purpose of this article is to report our experience concerning the indications and results for combined liver-kidney transplantation in our centre.
From July 1991 to October 2006, 26 patients ...underwent combined liver-kidney transplantation in our establishment. This group comprised 16 men and 10 women with a mean age of 50.1 years (range: 19 to 68 years). The main indications were as follows: hepatorenal polycystic disease, type I hyperoxaluria, cirrhosis associated with end-stage renal failure.
The median follow-up was 62.73 (+/-50.9) months. Only two patients of this series died, one at 70 months from gastric cancer, and the other at 89 months from cerebral metastases. Nine patients developed surgical complications (29%). Liver function was normal in the 24 surviving patients. Only one case of loss of renal graft was observed at 12 years and this patient is currently on dialysis. The mean creatinine level in these patients (apart from the dialysed patient) at the last follow-up visit was 120.3 (+/-30.43)micromol/l.
Combined liver-kidney transplantation can be performed with acceptable morbidity and mortality and excellent long-term results.
Method for preparation of crystalline undulators Avakian, R.O; Avetyan, K.T; Ispirian, K.A ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
10/2002, Letnik:
492, Številka:
1
Journal Article
Recenzirano
It is proposed to create crystalline undulators (CU) with periodically deformed crystallographic planes using the curvature due to the alternating stresses arising when strips of very thin films are ...grown on a thin substrate. Besides their usual channeling motion the particles channeled in CU perform oscillations with period and amplitude of CU and produce quasimonochromatic crystalline undulator radiation in X-ray or γ-quanta regions.
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