Efficiency of Electron-Positron Pair Productionby Neutrino Flux from Accretion Disk of a Kerr Black Hole

Dominant processes of neutrino production and neutrino-induced \ep-pair production are examined in the model of a disk hyper-accreting onto a Kerr black hole. The efficiency of plasma production by a neutrino flux from the disk, obtained for the both cases of presence and absence of a magnetic field, is found to be no more than several tenths of percent and, therefore, not enough for the origin of cosmological gamma-ray bursts.Comment: 8 pages, 1 figur

Semiclassical approach to the decay of protons in circular motion under the influence of gravitational fields

We investigate the possible decay of protons in geodesic circular motion around neutral compact objects. Weak and strong decay rates and the associated emitted powers are calculated using a semi-classical approach. Our results are discussed with respect to distinct ones in the literature, which consider the decay of accelerated protons in electromagnetic fields. A number of consistency checks are presented along the paper.Comment: To appear in Physical Review

Prediction of overall survival of patients with brain metastasis

The aim of the study – to identify factors that affect the life expectancy of patients with brain metastases.Цель исследования - выявить факторы, влияющие на продолжительность жизни пациентов с метастазами в головной мозг

Relativistic theory of inverse beta-decay of polarized neutron in strong magnetic field

The relativistic theory of the inverse beta-decay of polarized neutron, $\nu _{e} + n \to p + e ^{-}$, in strong magnetic field is developed. For the proton wave function we use the exact solution of the Dirac equation in the magnetic filed that enables us to account exactly for effects of the proton momentum quantization in the magnetic field and also for the proton recoil motion. The effect of nucleons anomalous magnetic moments in strong magnetic fields is also discussed. We examine the cross section for different energies and directions of propagation of the initial neutrino accounting for neutrons polarization. It is shown that in the super-strong magnetic field the totally polarized neutron matter is transparent for neutrinos propagating antiparallel to the direction of polarization. The developed relativistic approach can be used for calculations of cross sections of the other URCA processes in strong magnetic fields.Comment: 41 pages in LaTex including 11 figures in PostScript, discussion on nucleons AMM interaction with magnetic field is adde

The ννγ\nu \nu \gamma Amplitude in an External Homogeneous Electromagnetic Field

Neutrino-photon interactions in the presence of an external homogeneous constant electromagnetic field are studied. The $\nu \nu \gamma$ amplitude is calculated in an electromagnetic field of the general type, when the two field invariants are nonzero.Comment: 7 pages, 1 figur

POLYPOID CYSTITIS: A FINDING AND DIFFERENTIAL DIAGNOSIS

Background. Polypoid cystitis may simulate urothelial neoplasias cystoscopically and histologically. The frequency of polypoid cystitis is 0.38%; that among patients undergoing bladder catheterization is 6 %.Subjects and methods. The authors estimated the frequency of polypoid cystitis among chronic cystitis patients admitted to City Clinical Hospital Fifty, a base of the Clinic of Urology, Moscow State University of Medicine and Dentistry, in the period from February 2008 to February 2010. Out of 819 patients followed up, 3 who had diagnosed as having polypoid cystitis complained of pollakiuria, imperative micturate urges, and macrohematuria. They underwent ultrasonography, computed tomography, and cystoscopy; bladder masses measured 1.0, 7.0, and 11.5 cm, respectively; extensive growth was verified in 2 cases. Endoscopic studies identified procumbent rough-villous masses without well-defined outlines with the signs of bullous edema, decay, hemorrhages, and urinary salt encrustations. By taking into account the clinical picture and laboratory and instrumental findings, the authors suspected stage T3bNхMх bladder tumor in 2 patients and T1NхMх stage in 1. According to the European Association of Urology guidelines for management of bladder cancer, the patients underwent transurethral bladder resection. The patients were diagnosed as having polypoid cystitis on the basis of postmortem evidence.Results. In this study the frequency of polypoid cystitis was 37 %. Polypoid cystitis, a benign mass without a risk for malignancy, had signs of invasive transitional cell carcinoma.Conclusion. Such cases that rarely occur in practice are of clinical value and interest to urologists, pathologists, and oncologists.</p

Expansion and Evolution of the X-Linked Testis Specific Multigene Families in the melanogaster Species Subgroup

The testis specific X-linked genes whose evolution is traced here in the melanogaster species subgroup are thought to undergo fast rate of diversification. The CK2ßtes and NACβtes gene families encode the diverged regulatory β-subunits of protein kinase CK2 and the homologs of β-subunit of nascent peptide associated complex, respectively. We annotated the CK2βtes-like genes related to CK2ßtes family in the D. simulans and D. sechellia genomes. The ancestor CK2βtes-like genes preserved in D. simulans and D. sechellia are considered to be intermediates in the emergence of the D. melanogaster specific Stellate genes related to the CK2ßtes family. The CK2ßtes-like genes are more similar to the unique autosomal CK2ßtes gene than to Stellates, taking into account their peculiarities of polymorphism. The formation of a variant the CK2ßtes gene Stellate in D. melanogaster as a result of illegitimate recombination between a NACßtes promoter and a distinct polymorphic variant of CK2ßtes-like ancestor copy was traced. We found a close nonrandom proximity between the dispersed defective copies of DINE-1 transposons, the members of Helitron family, and the CK2βtes and NACβtes genes, suggesting an involvement of DINE-1 elements in duplication and amplification of these genes

ПОЛИПОИДНЫЙ ЦИСТИТ: НАХОДКА И ДИФФЕРЕНЦИАЛЬНЫЙ ДИАГНОЗ

Background. Polypoid cystitis may simulate urothelial neoplasias cystoscopically and histologically. The frequency of polypoid cystitis is 0.38%; that among patients undergoing bladder catheterization is 6 %.Subjects and methods. The authors estimated the frequency of polypoid cystitis among chronic cystitis patients admitted to City Clinical Hospital Fifty, a base of the Clinic of Urology, Moscow State University of Medicine and Dentistry, in the period from February 2008 to February 2010. Out of 819 patients followed up, 3 who had diagnosed as having polypoid cystitis complained of pollakiuria, imperative micturate urges, and macrohematuria. They underwent ultrasonography, computed tomography, and cystoscopy; bladder masses measured 1.0, 7.0, and 11.5 cm, respectively; extensive growth was verified in 2 cases. Endoscopic studies identified procumbent rough-villous masses without well-defined outlines with the signs of bullous edema, decay, hemorrhages, and urinary salt encrustations. By taking into account the clinical picture and laboratory and instrumental findings, the authors suspected stage T3bNхMх bladder tumor in 2 patients and T1NхMх stage in 1. According to the European Association of Urology guidelines for management of bladder cancer, the patients underwent transurethral bladder resection. The patients were diagnosed as having polypoid cystitis on the basis of postmortem evidence.Results. In this study the frequency of polypoid cystitis was 37 %. Polypoid cystitis, a benign mass without a risk for malignancy, had signs of invasive transitional cell carcinoma.Conclusion. Such cases that rarely occur in practice are of clinical value and interest to urologists, pathologists, and oncologists.Введение. Полипоидный цистит цистоскопически и гистологически может «симулировать» уротелиальные неоплазии. Частота встречаемости полипоидного цистита составляет 0,38 %; среди пациентов, перенесших катетеризацию мочевого пузыря (МП), – 6 %.Материалы и методы. Мы оценили частоту встречаемости полипоидного цистита среди пациентов с хроническим циститом, поступивших в клинику урологии МГМСУ на базе ГКБ № 50 за период с февраля 2008 по февраль 2010 г. Из наблюдавшихся 819 пациентов 3 больных с диагностированным полипоидным циститом предъявляли жалобы на учащенное мочеиспускание, императивные позывы и макрогематурию. Им были проведены ультразвуковое исследование, компьютерная томография и цистоскопия, размеры образования МП составили 1,0; 7,0 и 11,5 см соответственно, в 2 случаях подтвержден распространенный характер роста. При эндоскопическом исследовании определялись стелющиеся грубоворсинчатые образования без четких границ с явлениями буллезного отека, распада, кровоизлияний и инкрустацией мочевыми солями. С учетом клинической картины и данных лабораторно-инструментальных исследований у 2 пациентов предположили наличие опухоли МП стадии T3bNхMх, у 1 – стадии T1NхMх. Согласно рекомендациям руководства Европейской ассоциации урологов по лечению рака МП пациентам была выполнена трансуретральная резекция МП. На основании данных патоморфологического исследования у пациентов диагностирован полипоидный цистит.Результаты. Частота встречаемости полипоидного цистита в нашем исследовании составила 37 %. Полипоидный цистит, доброкачественное образование без риска развития злокачественного процесса, имел признаки инвазивного переходно-клеточного рака.Заключение. Подобные случаи, редко встречающиеся в практике, представляют клиническую ценность и интересны для урологов, патологов и онкологов