Idade Precoce De Início Da Atividade Sexual Está Associada A Elevada Prevalência De Lesão Intraepitelial Escamosa De Alto Grau

To evaluate the association of age at first sexual intercourse with the results of the cervicovaginal cytology. Study Design Observational analytical study about the prevalence of altered cervicovaginal cytology results in women aged between 18 and 34 years from a densely populated area in Brazil, during 10 years. The patients were stratified into 2 categories according to their age at first sexual intercourse (13–16 years and 17–24 years). Results From the total of 2,505,154 exams, 898,921 tests were in accordance with the inclusion criteria. Considering women with 4 years or less from the first sexual intercourse as a reference, those with 5 to 9 years and 10 years or more showed a higher prevalence of high-grade squamous intraepithelial lesions (HSILs). Women with an earlier onset of sexual intercourse (13–16 years) showed higher prevalence ratios for atypical squamous cells (ASC), low-grade squamous intraepithelial lesion (LSIL) and HSIL. The prevalence ratio for HSIL adjusted by age at diagnosis and by age at first sexual intercourse was higher only for women with an earlier onset of sexual intercourse. Conclusions The age of first sexual intercourse could be a variable that might qualify the selection among young women who are really at a higher risk for HSIL. © 2017 by Thieme-Revinter Publicações Ltda, Rio de Janeiro, Brazil.3928085UNICAMP, Universidade Estadual de Campina

Search for long-lived neutral particles in pp collisions at s√=13 TeV that decay into displaced hadronic jets in the ATLAS calorimeter

This paper describes a search for pairs of neutral, long-lived particles decaying in the ATLAS calorimeter. Long-lived particles occur in many extensions to the Standard Model and may elude searches for new promptly decaying particles. The analysis considers neutral, long-lived scalars with masses between 5 and 400 GeV, produced from decays of heavy bosons with masses between 125 and 1000 GeV, where the long-lived scalars decay into Standard Model fermions. The analysis uses either 10.8 fb−1 or 33.0 fb−1 of data (depending on the trigger) recorded in 2016 at the LHC with the ATLAS detector in proton–proton collisions at a centre-of-mass energy of 13 TeV. No significant excess is observed, and limits are reported on the production cross section times branching ratio as a function of the proper decay length of the long-lived particles

Study of Z → llγ decays at √s = 8 TeV with the ATLAS detector

This paper presents a study of Z → llγ decays with the ATLAS detector at the Large Hadron Collider. The analysis uses a proton–proton data sample corresponding to an integrated luminosity of 20.2 fb−1 collected at a centre-ofmass energy √s = 8 TeV. Integrated fiducial cross-sections together with normalised differential fiducial cross-sections, sensitive to the kinematics of final-state QED radiation, are obtained. The results are found to be in agreement with stateof-the-art predictions for final-state QED radiation. First measurements of Z → llγ γ decays are also reported

Software performance of the ATLAS track reconstruction for LHC run 3

Charged particle reconstruction in the presence of many simultaneous proton–proton (pp) collisions in the LHC is a challenging task for the ATLAS experiment’s reconstruction software due to the combinatorial complexity. This paper describes the major changes made to adapt the software to reconstruct high-activity collisions with an average of 50 or more simultaneous pp interactions per bunch crossing (pileup) promptly using the available computing resources. The performance of the key components of the track reconstruction chain and its dependence on pile-up are evaluated, and the improvement achieved compared to the previous software version is quantified. For events with an average of 60 pp collisions per bunch crossing, the updated track reconstruction is twice as fast as the previous version, without significant reduction in reconstruction efficiency and while reducing the rate of combinatorial fake tracks by more than a factor two

Observation of four-top-quark production in the multilepton final state with the ATLAS detector

This paper presents the observation of four-top-quark (tt¯tt¯) production in proton-proton collisions at the LHC. The analysis is performed using an integrated luminosity of 140 fb−1 at a centre-of-mass energy of 13 TeV collected using the ATLAS detector. Events containing two leptons with the same electric charge or at least three leptons (electrons or muons) are selected. Event kinematics are used to separate signal from background through a multivariate discriminant, and dedicated control regions are used to constrain the dominant backgrounds. The observed (expected) significance of the measured tt¯tt¯ signal with respect to the standard model (SM) background-only hypothesis is 6.1 (4.3) standard deviations. The tt¯tt¯ production cross section is measured to be 22.5+6.6−5.5 fb, consistent with the SM prediction of 12.0±2.4 fb within 1.8 standard deviations. Data are also used to set limits on the three-top-quark production cross section, being an irreducible background not measured previously, and to constrain the top-Higgs Yukawa coupling and effective field theory operator coefficients that affect tt¯tt¯ production

Produção e azoto recuperado por nabiça e cevada cultivadas em vasos a partir de fertilizantes orgânicos e minerais

O fornecimento de azoto à agricultura biológica pode ser feito através da aplicação de fertilizante orgânicos comerciais. Contudo, estes tendem a ter preços elevados. Assim, é importante obter informação sobre o seu valor agronómico para auxiliar na tomada de decisão. Neste trabalho estudou-se a libertação de azoto e efeito na produção de um fertilizante orgânico autorizado para agricultura biológica por comparação com uma fonte de azoto mineral. A experiência decorreu em vasos de 2 kg de terra e incluiu as culturas de nabiça (Brassica rapa L.) e cevada (Hordeum vulgare L.) cultivadas, respetivamente no outono e primavera. Foram incluídos as seguintes modalidades: Fertilizante orgânico nas doses I 000 (FOIOOO), 500 (F0500), 100 (FOIOO) e 50 (F050) kg N ha-1, fertilizante mineral nas doses 1000 (FMlOOO), 500 (FM500), 100 (FMlOO) e 50 (F050) kg N ha-1 , fertilizante mineral fracionado na dose de 50 + 50 kg N ha-1 (FF50) e testemunha, sem fertilizante azotado (T). De cada tratamento foram incluídas quatro repetições (4 vasos). O fertilizante orgânico apresentou a composição média de 10% humidade, 5% N, 5% P20 5 e 3% K20. A modalidade FMIOO originou produção de matéria seca de nabiça (2.2 g/vaso) e N exportado (84.7 mg/vaso) significativamente superior às restantes modalidades, seguida de FF50 (1.87 g/vaso; 52.0 mg/vaso) e FM50 (1.73 g/vaso; 49.7 mg/vaso). A modalidade FO lOO originou matéria seca e azoto exportado (1.10 g/vaso; 27.1 mg/vaso) estatisticamente superiores a F050 (0.77 g/vaso; 15.1 mg/vaso) e nesta superiores a testemunha (0.33 g/vaso; 7.0 g/vaso). A eficiência de uso de azoto (EUN) foi maior nas modalidades FF50 e FM50, seguidas de FMIOO. As modalidades FOIOO e F050 apresentaram EUN bastante inferiores às modalidades de aplicação de azoto mineral. As modalidades FM 1000, FM500 e FOI 000 causaram danos visíveis nas plantas na fase de germinação, eventualmente por toxicidade de NHiNl~ +, N02- ou efeito salino. As modalidades orgânicas tiveram um comportamento mais próximas das minerais no ciclo de crescimento da cevada, eventualmente pelo efeito continuado de libertação de azoto. A modalidade FF50 registou a maior produção combinada das duas culturas e maior eficiência de uso do azoto