DOCKING STUDY OF PIRROLOALLOCOLCHICINOIDS - COLCHICINEBINDING SITE LIGANDS

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Is weak temperature dependence of electron dephasing possible?

The first-principle theory of electron dephasing by disorder-induced two state fluctuators is developed. There exist two mechanisms of dephasing. First, dephasing occurs due to direct transitions between the defect levels caused by inelastic electron-defect scattering. The second mechanism is due to violation of the time reversal symmetry caused by time-dependent fluctuations of the scattering potential. These fluctuations originate from an interaction between the dynamic defects and conduction electrons forming a thermal bath. The first contribution to the dephasing rate saturates as temperature decreases. The second contribution does not saturate, although its temperature dependence is rather weak, $\propto T^{1/3}$. The quantitative estimates based on the experimental data show that these mechanisms considered can explain the weak temperature dependence of the dephasing rate in some temperature interval. However, below some temperature dependent on the model of dynamic defects the dephasing rate tends rapidly to zero. The relation to earlier studies of the dephasing caused by the dynamical defects is discussed.Comment: 14 pages, 6 figures, submitted to PR

Клинико-эпидемиологические особенности проявлений папилломавирусной инфекции на примере рака шейки матки и аногенитальных (венерических) бородавок

Background: Cervical cancer and genital warts (GWs) are some of the most common manifestations of human papillomavirus infection (HPV). These lesions cause significant damage to the reproductive health of the population, which leads to increased attention to the prevention of HPV infection among various population groups. Aims: To determine the clinical and epidemiological features of the HPV manifestations by the example of cervical cancer and genital warts. Methods: A retrospective analysis of anamnestic information of 115 women with an established diagnosis of cervical cancer and 177 patients with an established diagnosis of GWs was performed. The clinical and epidemiological characteristics of patients with diagnoses of GWs and cervical cancer were based on the development of outpatient admission cards and inpatient histories, as well as test data for HPV. Results: HPV 16 was the most common HPV type among patients with GWs and cervical cancer ― it was detected in 37.6% of cases. Also the most frequently encountered: HPV 6/18/11/31/51/52. In 43.2% cases of HPV detection, two or more types were detected at once, the most common combinations: HPV16 and HPV18, HPV6 and HPV16, HPV6 and HPV11. Analysis of the frequency of screening for cervical cancer and visits to the gynecologist for 5 years before establishing the diagnosis showed that among those who did not screen for cervical cancer, the risk of diagnosing stage IIIV was 5.2 times higher than among individuals who underwent cervical screening 2 years ago, or once a year for the last five years. Among patients with GWs who had 2 or more sexual partners for 1 year, 13.5% of patients regularly used barrier contraception methods (condoms) during sexual contact, not regularly ― 61.5%, did not use them at all ― 25.0%. Conclusions: Identifying the clinical and epidemiological features of HPV infection should contribute to the development of new and optimize existing prevention programs for a wide range of HPV-associated diseases.Обоснование. Рак шейки матки (РШМ) и аногенитальные (венерические) бородавки являются наиболее распространенными проявлениями папилломавирусной инфекции. Данные поражения наносят существенный ущерб репродуктивному здоровью населения, что обусловливает повышенное внимание к вопросам профилактики папилломавирусной инфекции среди различных групп населения. Цель исследования ― определение отдельных клинико-эпидемиологических особенностей папилломавирусной инфекции на примере рака шейки матки и аногенитальных (венерических) бородавок. Методы. Выполнено ретроспективное исследование; объектом исследования были пациенты с диагнозами РШМ и аногенитальных (венерических) бородавок, обратившиеся за медицинской помощью в период с 2015 по 2018 г. Данные получены с помощью сбора информации из медицинских карт стационарного больного (форма 003/у) и медицинских карт пациента, получающего медицинскую помощь в амбулаторных условиях (форма 025/у). Методы анализа и обработки материала ― аналитический и статистический. Результаты. В рамках исследования были проанализированы 292 карты пациентов, обратившихся за медицинской помощью. Наиболее часто ― в 37,6% случаев ― у пациентов с аногенитальными бородавками и РШМ при лабораторном обследовании выявлялся вирус папилломы человека (ВПЧ) 16-го типа. Также часто встречались ВПЧ 6/18/11/31/51/52. В 43,2% случаев определялись одновременно два и более типов ВПЧ, при этом наиболее частыми сочетаниями были ВПЧ16 и ВПЧ18, ВПЧ6 и ВПЧ16, ВПЧ6 и ВПЧ11. Проведенный анализ частоты скрининга на РШМ и посещения врача-гинеколога в течение 5 лет до установления диагноза показал, что среди лиц, не проходивших скрининг на РШМ, или прошедших его при обнаружении заболевания, риск выявления диагноза на IIIV стадии был в 5,2 раза выше, чем среди лиц, которые проходили цервикальный скрининг 2 года назад или 1 раз в год в течение последних 5 лет. Среди всех пациентов с аногенитальными бородавками, имевших по два и более половых партнера в течение 1 года, о регулярном использовании методов барьерной контрацепции (презервативов) при половом контакте сообщили 13,5%, о нерегулярном использовании ― 61,5%; 25,0% пациентов вообще не задумывались о методах предохранения. Заключение. Выявление клинико-эпидемиологических особенностей папилломавирусной инфекции должно способствовать разработке новых и оптимизации существующих профилактических программ в отношении широкого спектра ВПЧ-ассоциированных заболеваний

Measurement of the Ds lifetime

We report precise measurement of the Ds meson lifetime. The data were taken by the SELEX experiment (E781) spectrometer using 600 GeV/c Sigma-, pi- and p beams. The measurement has been done using 918 reconstructed Ds. The lifetime of the Ds is measured to be 472.5 +- 17.2 +- 6.6 fs, using K*(892)0K+- and phi pi+- decay modes. The lifetime ratio of Ds to D0 is 1.145+-0.049.Comment: 5 pages, 2 figures submitted to Phys. Lett.

Confirmation of the Double Charm Baryon Xi_cc+ via its Decay to p D+ K-

We observes a signal for the double charm baryon Xi_cc+ in the charged decay mode Xi_cc+ -> p D+ K- to complement the previously reported decay Xi_cc+ -> Lambda_c K- pi+ in data from SELEX, the charm hadro-production experiment (E781) at Fermilab. In this new decay mode we observe an excess of 5.62 events over an expected background estimated by event mixing to be 1.38+/-0.13 events. The Poisson probability that a background fluctuation can produce the apparent signal is less than 6.4E-4. The observed mass of this state is (3518+/-3)MeV/c^2, consistent with the published result. Averaging the two results gives a mass of (3518.7+/-1.7)MeV/c^2. The observation of this new weak decay mode confirms the previous SELEX suggestion that this state is a double charm baryon. The relative branching ratio Gamma(Xi_cc+ -> pD+K-)/Gamma(Xi_cc+ -> Lambda_c K- pi+) = 0.36+/-0.21.Comment: 11 pages, 6 included eps figures. v2 includes improved statistical method to determine significance of observation. Submitted to PL

Search for direct production of charginos and neutralinos in events with three leptons and missing transverse momentum in √s = 7 TeV pp collisions with the ATLAS detector

A search for the direct production of charginos and neutralinos in final states with three electrons or muons and missing transverse momentum is presented. The analysis is based on 4.7 fb−1 of proton–proton collision data delivered by the Large Hadron Collider and recorded with the ATLAS detector. Observations are consistent with Standard Model expectations in three signal regions that are either depleted or enriched in Z-boson decays. Upper limits at 95% confidence level are set in R-parity conserving phenomenological minimal supersymmetric models and in simplified models, significantly extending previous results

Jet size dependence of single jet suppression in lead-lead collisions at sqrt(s(NN)) = 2.76 TeV with the ATLAS detector at the LHC

Measurements of inclusive jet suppression in heavy ion collisions at the LHC provide direct sensitivity to the physics of jet quenching. In a sample of lead-lead collisions at sqrt(s) = 2.76 TeV corresponding to an integrated luminosity of approximately 7 inverse microbarns, ATLAS has measured jets with a calorimeter over the pseudorapidity interval |eta| < 2.1 and over the transverse momentum range 38 < pT < 210 GeV. Jets were reconstructed using the anti-kt algorithm with values for the distance parameter that determines the nominal jet radius of R = 0.2, 0.3, 0.4 and 0.5. The centrality dependence of the jet yield is characterized by the jet "central-to-peripheral ratio," Rcp. Jet production is found to be suppressed by approximately a factor of two in the 10% most central collisions relative to peripheral collisions. Rcp varies smoothly with centrality as characterized by the number of participating nucleons. The observed suppression is only weakly dependent on jet radius and transverse momentum. These results provide the first direct measurement of inclusive jet suppression in heavy ion collisions and complement previous measurements of dijet transverse energy imbalance at the LHC.Comment: 15 pages plus author list (30 pages total), 8 figures, 2 tables, submitted to Physics Letters B. All figures including auxiliary figures are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/HION-2011-02

Search for displaced vertices arising from decays of new heavy particles in 7 TeV pp collisions at ATLAS

We present the results of a search for new, heavy particles that decay at a significant distance from their production point into a final state containing charged hadrons in association with a high-momentum muon. The search is conducted in a pp-collision data sample with a center-of-mass energy of 7 TeV and an integrated luminosity of 33 pb^-1 collected in 2010 by the ATLAS detector operating at the Large Hadron Collider. Production of such particles is expected in various scenarios of physics beyond the standard model. We observe no signal and place limits on the production cross-section of supersymmetric particles in an R-parity-violating scenario as a function of the neutralino lifetime. Limits are presented for different squark and neutralino masses, enabling extension of the limits to a variety of other models.Comment: 8 pages plus author list (20 pages total), 8 figures, 1 table, final version to appear in Physics Letters

Observation of a new chi_b state in radiative transitions to Upsilon(1S) and Upsilon(2S) at ATLAS

The chi_b(nP) quarkonium states are produced in proton-proton collisions at the Large Hadron Collider (LHC) at sqrt(s) = 7 TeV and recorded by the ATLAS detector. Using a data sample corresponding to an integrated luminosity of 4.4 fb^-1, these states are reconstructed through their radiative decays to Upsilon(1S,2S) with Upsilon->mu+mu-. In addition to the mass peaks corresponding to the decay modes chi_b(1P,2P)->Upsilon(1S)gamma, a new structure centered at a mass of 10.530+/-0.005 (stat.)+/-0.009 (syst.) GeV is also observed, in both the Upsilon(1S)gamma and Upsilon(2S)gamma decay modes. This is interpreted as the chi_b(3P) system.Comment: 5 pages plus author list (18 pages total), 2 figures, 1 table, corrected author list, matches final version in Physical Review Letter