Resumo Sob o paradigma da educação inclusiva, o ensino de Matemática para estudantes surdos e ouvintes tem sido um desafio para professores que, frequentemente, se deparam com a escassez ou inexistência de materiais didáticos bilíngues em Língua Brasileira de Sinais (Libras) e Língua Portuguesa. Nesse sentido, esta pesquisa aplicada de abordagem qualitativa teve o objetivo de produzir quatro videoaulas de Matemática bilíngues Libras/Língua Portuguesa para a Educação Básica. As videoaulas produzidas foram testadas junto a alunos surdos e ouvintes com registro em áudio e vídeo e aplicação de questionário com roteiro semiestruturado, posteriormente transcritos e analisados a partir de excertos representativos. Os resultados revelaram que, embora se reconheça a importância do uso de recursos visuais na Educação Matemática e no ensino de surdos, os participantes da pesquisa relataram nunca terem tido contato com tal material em classe. Ademais, foi ressaltado o aspecto positivo da ampliação e inversão do espaço destinado ao tradutor e intérprete de Libras/Língua Portuguesa na tela, habitualmente reservado a uma janela no canto inferior direito por outros vídeos. Com isso, demonstrou-se que a elaboração de videoaulas pode constituir uma importante estratégia para o campo dos materiais didáticos de ensino de Matemática para surdos.

Abstract Under the inclusive education paradigm, teaching mathematics to deaf and hearing students has been a challenge for teachers who often face the scarcity or non-existence of bilingual teaching materials in Brazilian Sign Language (Libras) and Portuguese. In this sense, this applied research with a qualitative approach aimed to produce four bilingual math video classes in Libras/Portuguese for basic education. The produced video classes were tested with deaf and hearing students with audio and video recording and application of a questionnaire with a semi-structured script, later transcribed and analyzed from representative excerpts. The results revealed that although recognizing the importance of using visual aids in mathematics education and deaf education, the research participants reported that they have never had contact with such material in class. Furthermore, the positive aspect of the expansion and inversion of the space destined for the Libras/Portuguese translator and interpreter on the screen was highlighted, it was usually reserved to a window in the lower right corner for other videos. Thus, it has been demonstrated that the development of video classes can be an important strategy for the field of math teaching materials for deaf students.

ABSTRACT BACKGROUND: The term dangerous universal blood donor refers to potential agglutination of the erythrocytes of non-O recipients due to plasma of an O blood group donor, which contains high titers of anti-A and/or anti-B hemagglutinins. Thus, prior titration of anti-A and anti-B hemagglutinins is recommended to prevent transfusion reactions. OBJECTIVE: The aim of this study was to estimate the frequency of dangerous universal donors in the blood bank of Belo Horizonte (Fundação Central de Imuno-Hematologia - Fundação Hemominas - Minas Gerais) by determining the titers of anti-A and anti-B hemagglutinins in O blood group donors. METHOD: A total of 400 O blood group donors were randomly selected, from March 2014 to January 2015. The titers of anti-A and anti-B hemagglutinins (IgM and IgG classes) were obtained using the tube titration technique. Dangerous donors were those whose titers of anti-A or anti-B IgM were ≥128 and/or the titers of anti-A or anti-B IgG were ≥256. Donors were characterized according to gender, age and ethnicity. The hemagglutinins were characterized by specificity (anti-A and anti-B) and antibody class (IgG and IgM). RESULTS: Almost one-third (30.5%) of the O blood group donors were universal dangerous. The frequency among women was higher than that of men (p-value = 0.019; odds ratio: 1.66; 95% confidence interval: 1.08-2.56) and among young donors (18-29 years old) it was higher than for donors between 49 and 59 years old (p-value = 0.015; odds ratio: 3.05; 95% confidence interval: 1.22-7.69). There was no significant association between dangerous universal donors and ethnicity, agglutinin specificity or antibody class. CONCLUSION: Especially platelet concentrates obtained by apheresis (that contain a substantial volume of plasma), coming from dangerous universal donors should be transfused in isogroup recipients whenever possible in order to prevent the occurrence of transfusion reactions.

Os sistemas de gestão da qualidade (SGQ) e ambiental (SGA) vêm sendo amplamente desenvolvidos em laboratórios nos dias atuais, o que tem contribuindo com melhorias significativas nos processos de gestão da medição e na visão dos clientes. Objetivou-se com este artigo avaliar a medição de turbidez para garantir a qualidade dos resultados das análises para a execução dos serviços de ensaios do Laboratório de Análise de Água do Departamento de Engenharia (LAADEG) da Universidade Federal de Lavras (UFLA). Avaliaram-se dois turbidímetros de bancada "A e B" por meio de estudo estatístico de capacidade do processo, analisando os índices de capacidade potencial (Cp) e capacidade de desempenho (Cpk). Identificaram-se, também, as causas especiais presentes nas cartas de controle, utilizando-se de padrões não aleatórios estabelecidos previamente. Após os estudos, definiu-se que deverá ser utilizado o turbidímetro "B" para a realização de todas as medições de turbidez no LAADEG.

The quality management system (QMS) and environmental management system (EMS) are currently being widely developed in laboratories, and have contributed to significant improvements in measurement management processes and client opinion. The purpose of this work is to establish appropriate methodologies for assessing the turbidity measurement that guarantee the quality of the results concerning precision and accuracy and also to test the service performance of the Water Analysis Laboratory of the Engineering Department (LAADEG) of Federal University of Lavras (UFLA). The research assessed two bench turbidimeters "A and B" through a statistical process capability study, analyzing the potential capability indexes (Cp) and performance capability (Cpk). We identified special causes also present in the control through non predetermined random patterns. After the studies, it was found that turbidimeter "B" should be used for all turbidity measurements in LAADEG, since its precision was higher than turbidimeter "A".