156 research outputs found

    Tributyltin chloride disrupts glucose and lipid homeostasis on Wistar male rats

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    Tributyltin chloride is still a relevant water and seafood pollutant, as reported for some sites of Mediterranean and Iberian coastal waters. We evaluated TBT metabolic effect in Wistar male rats, after administration of a repeated oral dose of 8.5mg/L in ethanol 0.25%, during 28 days, according to DIR96/54/EC. Groups of six animals, individually caged, were daily observed for fast blood glycaemia and semi-quantitative urine analysis. Glycaemic levels were significantly lower on the test group along the assay, showing a tendency for fasting hypoglycaemia. Urine analysis showed the presence of ketonic bodies in test group during the treatment. At the end of test period, animals were euthanized and serum analysis was performed revealing a significant increment of cholesterol and HDL-cholesterol (9.3% and 6.7%, respectively) and a non-significant increment on triglycerides content. These results suggest that TBT disrupted glucose and lipid homeostasis. Accordingly, and considering TBT a new member of environmental obesogen family, it is most relevant to reassess the effect of chronic exposure to low doses of this pollutant

    Relatório de Estágio Pedagógico Escola Secundária Frei Heitor Pinto

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    O presente relatório de estágio foi efetuado no âmbito da unidade curricular de Estágio, do 2º ano do 2º ciclo de estudos em Ensino de Educação Física nos Ensinos Básico e Secundário, da Universidade da Beira Interior. A realização do Estágio teve como objetivos o aprofundar dos conhecimentos científicos e pedagógicos, potencializar a capacidade em observar e avaliar, saber incorporar diversos saberes numa perspetiva inter e transdisciplinar, colaborar para uma maior relação entre a escola e o meio e elucidar para a importância da autoformação nos variados domínios da atividade docente. O documento divide-se em dois capítulos fundamentais. Um primeiro capítulo referente à intervenção pedagógica realizada no decorrer do ano letivo 2021/2022 no Agrupamento de Escolas Frei Heitor Pinto. Foi um ano letivo atípico, devido à pandemia e às obras de requalificação dos espaços desportivos na Escola Secundária Frei Heitor Pinto. A intervenção realizada no 2º ciclo, ocorreu na Escola Básica do Tortosendo. Por sua vez, a intervenção no 3º ciclo do ensino básico e secundário, na Escola Secundária Frei Heitor Pinto, foi realizada em duas turmas, uma do 9º ano e outra do 10º ano de escolaridade. No decorrer do ano, foi possível acompanhar e intervir no Desporto Escolar na modalidade de Badminton, bem como efetuar a função de assessoria à direção de turma do 10º C. Um segundo capítulo relativo à investigação e inovação pedagógica. Foi realizado, no 2º período letivo, um estudo numa turma do ensino secundário que analisou a motivação associada e a performance no jogo na matéria de ensino de Basquetebol, pelo meio da aplicação de um modelo de ensino híbrido, baseado no Modelo de Educação Desportiva e no Teaching Games for Understanding. Participaram no estudo um total de 18 alunos com idades compreendidas entre os 15 e os 17 anos (15,67 ± 0,69). Os instrumentos de avaliação utilizados foram o Questionário de Atitudes dos Alunos face à Educação Física e o Game Performance Assessement Instrument, ainda assim, os mesmos foram aplicados em dois momentos distintos. Com a aplicação do modelo de ensino híbrido, não se verificaram melhorias significativas para com a motivação, por outro lado, verificaram-se diferenças em relação à performance no jogo.This internship report was completed as part of the Internship curricular unit, of the 2nd year of the 2nd study cycle in Teaching Physical Education in Basic and Secondary Education, at the University of Beira Interior. The internship´s goals were to deepen scientific and pedagogical knowledge, to improve observation and evaluation skills, to learn how to incorporate diverse knowledge in an inter and transdisciplinary perspective, to collaborate for a greater relationship between the school and the environment and to emphasize the importance of self-training in the various domains of teaching activity. The document is split into two major chapters. The first chapter discusses the pedagogical intervention implemented in the Frei Heitor Pinto School Grouping during the 2021/2022 school year. Due to the pandemic and the renovations to the Frei Heitor Pinto Secundary School´s athletics facilities, it was an unusual school year. The intervention carried out in the 2nd cycle took place at Tortosendo Elementary School. In turn, the intervention in the 3rd cycle of basic and secondary education was conducted in two classrooms, one in the 9th grade and another in the 10th grade, at Frei Heitor Pinto Secondary School. Throughout the year, it was possible to monitor and participate in School Sports in the Badminton modality, in addition to performing the role of advisory to the 10th C class management. A second chapter concerns research and pedagogical innovation. In the 2nd period, a study in a secondary school class was performed to analyze the associated motivation and performance in the Basketball teaching subject, using a hybrid teaching model based on the Sport Education Model and the Teaching Games for Understanding. The research included 18 students aged between 15 and 17 years (15.67 ± 0.69). The evaluation instruments used were the Questionnaire of Students' Attitudes toward Physical Education and the Game Performance Assessment Instrument, even so they were applied in two different moments. With the application of the hybrid teaching model, there were no significant improvements in motivation, on the other hand, there were differences about the performance in the game

    Smart manufacturing: uma análise da tecnologia LIDAR para qualidade do produto na indústria automotiva

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    The concept of Industry 4.0 first appeared in 2011, in an article published by the German government as a high-tech strategy for 2020. In recent years, this term has been widely discussed, referring to a complex and flexible system, which involves the digitization of manufacturing, engineering and automation technology. With this, the industry increasingly seeks to explore 'Smart Manufacturing', which is nothing more than the adoption of new technologies and manufacturing theories to help industries adapt to changes and raise product quality. Furthermore, after the third industrial revolution, the explosion of artificial intelligence (AI) and machine learning (ML) self learning algorithms laid a solid foundation for an increasingly connected industry. Using this solid foundation, the objective of the monograph is, based on the current state of the literature, to review and present the use of systems based on self learning (Artificial Intelligence/Machine Learning) in conjunction with the LIDAR (Light Detection and Ranging) sensor within the concepts proposed in Industry 4.0 and 'Smart Manufacturing'. Thus, in addition to being a basis for future work, this monograph presents as an opportunity and challenge, a new way of evaluating product quality in the manufacturing process of the automotive industry.UFU - Universidade Federal de UberlândiaTrabalho de Conclusão de Curso (Graduação)O conceito de Indústria 4.0 apareceu pela primeira vez em 2011, em um artigo publicado pelo governo alemão como estratégia de alta tecnologia para 2020. Nos últimos anos, esse termo tem sido amplamente discutido, se referindo a um sistema complexo e flexível, que envolve a digitalização da tecnologia de manufatura, engenharia e automação. Com isso, a indústria busca cada vez mais explorar a ‘Smart Manufacturing’, que nada mais é que a adoção de novas tecnologias e teorias de fabricação para ajudar as indústrias a se adaptarem as mudanças e elevar a qualidade do produto. Além disso, após a terceira revolução industrial, a explosão dos algoritmos de autoaprendizagem de Inteligência Artificial (IA) e Machine Learning (ML) lançaram uma base sólida para receber uma indústria cada vez mais conectada. Usando desta base sólida, o objetivo da monografia é, com base no estado atual da literatura, revisar e apresentar o uso de sistemas baseados em autoaprendizagem (Inteligência Artificial/Machine Learning) em conjunto com o sensor LIDAR (Light Detection and Ranging) dentro dos conceitos propostos na Indústria 4.0 e ‘Smart Manufacturing’. Dessa forma, além de base para futuros trabalhos, esta monografia apresenta como oportunidade e desafio, uma nova forma de avaliação da qualidade do produto no processo de fabricação da indústria automotiva

    A new approach for determination of Na,K-ATPase activity: application to intact pancreatic ß-cells

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    It has been postulated that a decrease in Na,KATPase-mediated ion gradients may be a contributing mechanism to insulin secretion. However, the precise role of the Na,K-ATPase in pancreatic β-cell membrane depolarization and insulin secretion signalling have been difficult to evaluate, mostly because data reporting changes in enzymatic activity have been obtained in cell homogenates or membrane preparations, lacking intact intracellular signalling pathways. The aim of this work was to develop a method to characterize Na,K-ATPase activity in intact pancreatic β-cells that will allow the investigation of putative Na,K-ATPase activity regulation by glucose and its possible role in insulin secretion signalling. This work demonstrates for the first time that it is possible to determine Na,K-ATPase activity in intact pancreatic βcells and that this is a suitable method for the study of the mechanisms involved in the Na,K-ATPase regulation and eventually its relevance for insulin secretion signalling

    JORNADAS 2010 DO DEPARTAMENTO DE QUÍMICA

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    No seguimento da recente restruturação da Universidade de Évora, consubstanciada pela entrada em vigor dos seus novos estatutos, coloca-se a toda a academia, em geral, e aos departamentos, em particular, uma imensa diversidade de desafios, que a todos exige grande determinação para os enfrentar e vencer. Na realidade, para além dos problemas decorrentes dos novos paradigmas do ensino superior que conduziram à recente reforma dos ensinos por força do chamado Processo de Bolonha e dos decorrentes da profunda crise financeira que tem condicionado a capacidade de acção dos departamentos, vivemos agora uma profunda mudança de modelo organizativo da Universidade de Évora que veio alterar, nalguns aspectos drasticamente, as competências dos departamentos, afastando-os dos centros de decisão internos, retirando-lhes competências nos planos científico e pedagógico, nos ensinos e na investigação, e deixando-os à míngua no plano financeiro. Apesar destas dificuldades, o Departamento de Química da Universidade de Évora tem-se empenhado com grande afinco e motivação na procura de novos caminhos, implementando medidas de rigor em todas as vertentes da sua acção. Nomeadamente, nos ensinos em que tem responsabilidades, a nível de 1º, 2º ou 3º Ciclos; na investigação conduzida pelos seus membros; no acompanhamento e apoio dos alunos; na inserção destes na investigação; na procura de novos públicos e no ensino à distância e em iniciativas de divulgação da ciência e da tecnologia. Procurando contribuir, deste modo, no âmbito da diversidade das suas atribuições em química e engenharia química, bioquímica e biotecnologia, para promover a excelência da Universidade de Évora e aumentar a sua competitividade e atractividade face à concorrência. Neste momento em que um novo reitor inicia o seu mandato é um momento oportuno para uma reflexão sobre os caminhos do futuro, o Departamento de Química da Universidade de Évora, no seguimento de iniciativas anteriores, realiza as suas Jornadas 2010, em 25 e 26 de Março, nas quais se propõe dinamizar um amplo debate, tendo em vista perspectivar o futuro papel do Departamento de Química na Universidade de Évora, enquanto membro da Escola de Ciências e Tecnologia, e aquilo que dele se espera face aos desafios que se colocam interna e externamente à Universidade de Évora

    Characterisation by molecular biology and MALDI-TOF ICMS of zygomycete Gongronella sp. isolated from an Alentejo vineyard soil

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    Zygomycete Gongronella sp. CCMI 1101 (MUM 10.263) was isolated from an Alentejo vineyard soil submitted to repeated treatments with the fungicide metalaxyl. This fungicide is widely used against Oomycetes species that causing downy mildew. After selective enrichment, adapted Gongronella sp. CCMI 1100 (MUM 10.262) showed high tolerance to metalaxyl with EC50 of 36.1 mg L-1. Additionally, this adapted fungus was able to use metalaxyl as main carbon and energy source. Afterwards, both Gongronella strains (non-adapted and metalaxyl adapted strains) were submitted to a polyphasic approach identification and characterisation. In contrast, proteomic analysis showed spectra with substantial quantitatively phenotypic differences between both strains that could be a consequence of a strain adaptation to metalaxyl. In conclusion, Gongronella sp. CCMI 1101 is now under further taxonomic studies and the current results suggest that the adapted strain CCMI 1100 can be explored in soil bioremediation for metalaxyl-degradation

    Effect of Cytisus multiflorus in the control of Type-2 Diabetes

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    Medicinal plants display diverse pharmacological activities with marked therapeutic effects. Type-2 diabetes (T2D) remains a major health problem among industrialized countries, therefore the investigation of formulas to prevent or attenuate the metabolic syndrome, including new therapeutic agents. Currently the interest of medicinal plants is increasing. Portuguese native flora includes several plants known for their hypoglycemic properties. The aim of this work was to study the pharmacological effect of Cytisus multiflorus, one plant from the Portuguese flora traditionally used as an ethnopharmacological agent in diabetes control

    Production of monosex male nile tilapia populations of the Chitralada strain

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    A fim de avaliar o efeito da alta temperatura na proporção de sexos da tilápia-do-nilo (Oreochromis niloticus) da linhagem Chitralada, foram conduzidos dois experimentos. No primeiro foram analisados, por 28 dias, os efeitos da temperatura de 35ºC, em relação ao controle (27ºC), iniciando-se dez dias após a eclosão. Foi encontrada diferença significativa na proporção de sexos, sendo que o maior porcentual de machos foi encontrado no tratamento de temperatura alta (72,39%), em comparação com o controle (62,27%). Não foram encontradas diferenças de peso corporal e de comprimento total entre os tratamentos. No segundo experimento, foram analisados os efeitos dos períodos de exposição à temperatura de 35ºC, aos 7, 14, 21 e 28 dias, iniciando-se dez dias após a eclosão. Não houve diferença na proporção de sexos entre os períodos de exposição. Foram encontradas diferenças significativas entre os tratamentos, tanto para peso corporal como para comprimento total. Nos dois experimentos, as taxas de sobrevivência relacionaram-se diretamente com a ocorrência de canibalismo, significativamente maior a 35ºC. Os efeitos significativos da temperatura na proporção de sexos, no primeiro experimento, indicam a termossensibilidade na linhagem Chitralada.The effect of high temperature on sex ratio in the Chitralada strain of Nile tilapia (Oreochromis niloticus) was tested using two experiments. Primarily, the animals were exposed to a high (35ºC) or control (27ºC) water temperature for a 28-day-period, beginning ten days after hatching. A significant difference in sex ratio was found. The highest proportion of males was in the high temperature group (72.39%), compared with the control group (62.27%). No differences were found for total length or body weight between the groups. In the second experiment, the effect of exposure times (7, 14, 21 and 28 days starting ten days post hatching) at a constant temperature of 35ºC was tested. No differences were found in sex ratio between groups. A significant difference was found between treatments for body weight and total length. In both experiments, the survival rate had a direct relationship with the occurrence of cannibalism, which was significantly higher at 35ºC. The significant temperature effect on sex ratio found in the first experiment indicates the thermosensitivity of the Chitralada strain

    Metalaxyl degradation by Mucorales strains Gongronella sp. and Rhizopus oryzae

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    In this study, the degradation of metalaxyl was investigated in the presence of two Mucorales strains, previously isolated from soil subjected to repeated treatments with this fungicide and selected after enrichment technique. Fungal strains were characterised by a polyphasic approach using phylogenetic analysis of the Internal Transcribed Spacer (ITS) gene region, phenotypic characterisation by Matrix-Assisted Laser Desorption Ionization Time-Of-Flight Mass Spectrometry (MALDI-TOF MS) spectral analysis, and growth kinetics experiments. The strains were identified as Gongronella sp. and Rhizopus oryzae. The fungal growth kinetics in liquid cultures containing metalaxyl fits with Haldane model. Under laboratory conditions, the ability of Gongronella sp. and R. oryzae cultures to degrade metalaxyl was evaluated in liquid cultures and soil experiments. Both species were able to: (a) use metalaxyl as the main carbon and energy source; and (b) degrade metalaxyl in polluted soils, with rates around 1.0 mg kg1 d1. This suggests these strains could degrade metalaxyl in soils contaminated with this fungicide.This study was supported by the Portuguese Foundation for Science and Technology (FCT) under the scope of the strategic funding of “HIT3CH-HERCULES Interface for Technology Transfer and Teaming in Cultural Heritage”, (ALT20-03-0246-FEDER-000004) under the scope of ALENTEJO 2020- Regional Operational Program of Alentejo and BioTecNorte operation (NORTE-01-0145-FEDER-000004) under the scope of Norte 2020 Regional Operational Program of Norte, funded by European Regional Development Fund. C. S. thanks to the University of La Frontera (Temuco, Chile) for the partial funding from Project DIUFRO DI16-0135.info:eu-repo/semantics/publishedVersio

    Optimiranje enzimske interesterifikacije mješavine mliječne masti i kanola ulja pomoću imobilizirane lipaze iz Rhizopus oryzae, primjenom metode odzivnih površina

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    Blends of milk fat and canola oil (MF:CNO) were enzymatically interesterified (EIE) by Rhizopus oryzae lipase immobilized on polysiloxane-polyvinyl alcohol (SiO2-PVA) composite, in a solvent-free system. A central composite design (CCD) was used to optimize the reaction, considering the effects of different mass fractions of binary blends of MF:CNO (50:50, 65:35 and 80:20) and temperatures (45, 55 and 65 °C) on the composition and texture properties of the interesterified products, taking the interesterification degree (ID) and consistency (at 10 °C) as response variables. For the ID variable both mass fraction of milk fat in the blend and temperature were found to be significant, while for the consistency only mass fraction of milk fat was significant. Empiric models for ID and consistency were obtained that allowed establishing the best interesterification conditions: blend with 65 % of milk fat and 35 % of canola oil, and temperature of 45 °C. Under these conditions, the ID was 19.77 % and the consistency at 10 °C was 56 290 Pa. The potential of this eco-friendly process demonstrated that a product could be obtained with the desirable milk fat flavour and better spreadability under refrigerated conditions.Mješavina mliječne masti i kanola ulja (MF:CNO) enzimski je interesterificirana pomoću lipaze iz Rhizopus oryzae, imobilizirane na kompozitu od polisiloksana i polivinil-alkohola, u sustavu bez otapala. Da bi se reakcija optimirala, upotrijebljen je centralno složeni dizajn (CCD), pri čemu su ispitani utjecaj masenog omjera MF:CNO (50:50, 65:35 i 80:20) i temperature (45, 55 i 65 °C) na sastav i teksturu interesterificiranih produkata, uz zavisne varijable: stupanj interesterifikacije i konzistenciju pri 10 °C. Na stupanj interesterifikacije bitno su utjecali maseni udio mliječne masti u mješavini i temperatura, dok je na konzistenciju utjecao samo maseni udio mliječne masti. Dobiven je empirijski model pomoću kojeg su utvrđeni optimalni uvjeti interesterifikacije: mješavina 65 % mliječne masti i 35 % kanola ulja, te temperatura od 45 °C. Pri tim je uvjetima postignut stupanj interesterifikacije od 19,77 %, a konzistencija pri 10 °C bila je 56 290 Pa. Pomoću ovog ekološkog postupka može se dobiti proizvod poželjnog mliječnog okusa i bolje mazivosti pri hladnim uvjetima skladištenja
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