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Impact of structural factors on the mental health of UFOP workers.
No full textO objetivo deste estudo é analisar a qualidade de vida dos trabalhadores da UFOP, investigando a influência de fatores estruturais como o ambiente de trabalho, iluminação, estrutura física e a relação com a administração na saúde mental e no bem-estar desses trabalhadores. Pretende-se compreender como esses fatores podem afetar negativamente a qualidade do trabalho exercido pelos trabalhadores da UFOP e fornecer subsídios para a identificação de possíveis intervenções e melhorias nas condições de trabalho, visando a promoção de uma melhor qualidade de vida e bem-estar desses profissionais. Como metodologia foi utilizado a quali-quantitativa e o método exploratório, visto que é um tema pouco trabalhado por pesquisadores, além de ser carente de bibliografia. Com a ajuda de ferramentas, como a análise SWOT, foram examinadas as respostas dos 30 entrevistados, sendo que estas apresentavam mais críticas do que elogios. Por fim, conclui-se ser uma pesquisa relevante, tanto no campo de informações apresentadas, quanto no campo de contribuição bibliográfica.The objective of this study is to analyze the quality of life of UFOP workers, investigating the influence of structural factors such as the work environment, lighting, physical structure, and the relationship with administration on the mental health and well-being of these workers. The aim is to understand how these factors can negatively affect the quality of work performed by UFOP workers and provide support for identifying possible interventions and improvements in working conditions, aiming to promote a better quality of life and well-being of these professionals. Quali-quantitative and exploratory methods were used as methodology, as it is a topic little studied by researchers, in addition to lacking a bibliography. With the help of tools such as SWOT analysis, the responses of the 30 interviewees were examined, and they contained more criticism than praise. Finally, it is concluded that it is relevant to research, both in the field of information presented and in the field of bibliographic contribution
Piperine as an herbal alternative for the prevention of drug-induced liver damage caused by paracetamol.
No full textBackground/Objective: Hepatic drug intoxication is becoming increasingly common with the increasing use of chronic medications. Piperine has emerged as a promising alternative for protecting the liver against drug-induced injury. We evaluated the prophylactic effects of piperine in C57BL/6 mice with an acute liver injury induced by a paracetamol (APAP) overdose. Methods: Piperine was administered at a dose of 20 mg/kg (P20) or 40 mg/kg (P40) for eight consecutive days before the animals were exposed to a hepatotoxic dose of paracetamol (500 mg/kg). The animals were euthanized 3 h after the paracetamol overdose. Results: The prophylactic treatment with piperine (P20 and P40) maintained the levels of alanine aminotransferase (ALT) and the biomarkers of oxidative damage (TBARS and carbonylated proteins), which were statistically similar to those for the control group. The extent of hepatocyte necrosis and TNF-α (tumor necrosis factor-alpha) levels were lower than those in the group exposed to liver injury (APAP group). Piperine modulated the gene expression of CYP2E1 (cytochrome P4502E1) and the inflammasome pathway (NLRP3, CASP-1, IL-1β, and IL-18), which play a crucial role in the inflammatory response. In the P40 group, the degree of hepatic hyperemia was similar to that in the control group, as was the increase in metalloproteinase 9 (MMP-9) activity. Conclusion: Piperine has demonstrated beneficial and promising effects for the prevention of liver injury resulting from paracetamol-induced drug intoxication
Mineralogical evaluation of a new global ilmenite resource from the coast of southern Brazil.
No full textThe presence of superficial deposits of heavy minerals along the Rio Grande do Sul Coastal Plain has generated much interest because of their potential as a new world-class resource. A detailed mineral characterization study of sixteen samples of ilmenite concentrates from the Sao ̃ Jos ́e do Norte deposit was conducted using electronic microprobe and magnetic susceptibility analyses. The results showed that the ilmenite concentrates have a TiO2 content (54.24 wt %) consistent with a mineral assemblage dominated by primary ilmenite and hydrated ilmenite. Histograms and graphs of the variation in minor element concentrations showed enrichment in TiO2, MnO, and Cr2O3 in the altered products and loss of iron and manganese oxides during increased weathering. The alteration ratios measured by the Ti/(Ti + Fe) variation in ilmenite range from 0.50 to 0.65. The altered grains contain primary ilmenite/hydrated ilmenite and pseudorutile phase associations. Different degrees of alteration in the grains were magnetically differentiated, with a greater concentration of the alteration products in the less magnetic fractions. Those altered grains with low magnetic susceptibility may play a critical role during mining because they behave differently from fresh and unaltered grains. This study confirms that the alteration process alters the physical–chemical characteristics of the minerals. Therefore, the degree of alteration influences the metallurgical processing of this ore. The comparison with other deposits shows that the degree of ilmenite alteration of Quaternary world-class deposits is less intense than that of Pliocene to Eocene Australian deposits
Imagens que dançam : dramaturgias e afetos na videodança de Alexandre Veras Costa.
No full textPrograma de Pós-Graduação em Artes Cênicas. Departamento de Artes, Instituto de Filosofia, Arte e Cultura, Universidade Federal de Ouro Preto.Esta pesquisa buscou investigar os modos através dos quais a dramaturgia opera na videodança por meio da análise das obras O Tempo da Delicadeza (2002), e o Regresso de Ulisses (2008), do realizador cearense Alexandre Veras Costa, com um recorte para as relações entre a câmera, o corpo e o espaço. Para tanto, questiono: Como a dramaturgia opera na videodança? A hipótese que levanto para responder a este problema é de que os modos de composição em videodança são de natureza dramatúrgica. Para testá-la, investigo como surgiu e se desenvolveu o conceito de dramaturgia ao longo do tempo, refazendo a sua trajetória desde o teatro grego até a pós- modernidade. Analiso como os materiais cênicos e os processos de criação e funcionamento de um espetáculo foram radicalmente modificados pelo teatro épico de Bertold Brecht, pelo teatro pós-dramático, pelas vanguardas históricas do início do século XX, pelas neovanguardas dos anos 1960 e pelas novas tecnologias. Adoto como procedimentos metodológicos a revisão bibliográfica para traçar um panorama histórico do conceito, o método de translação para descrever as duas obras de videodança, o método de análise de conteúdo para codificar e fazer inferências sobre os procedimentos de composição utilizados pelo cineasta, e uma entrevista semiestruturada para investigar as sutilezas do seu processo criativo. A partir dos dados obtidos na análise das obras, das respostas da entrevista e dos conceitos desenvolvidos na revisão histórica, apresento uma reflexão sobre o processo de composição das duas videodanças e proponho uma possível caracterização da sua poética.This research sought to investigate the ways in which dramaturgy operates in videodance through the analysis of the works O Tempo da Delicadeza (2002), and O Regresso de Ulisses (2008), by cearense director Alexandre Veras Costa, with an emphasis on the relationships between the camera, the body and the space. To this end, I ask: How does dramaturgy operate in videodance? The hypothesis I raise to answer this problem is that the modes of composition in videodance have a dramaturgical nature. To test it, I investigate how the concept of dramaturgy emerged and developed over time, retracing its trajectory from greek theater to postmodernity. I analyze how scenic materials and the processes of creating and operating a spectacle were radically modified by Bertold Brecht's epic theater, post-dramatic theater, the historical avant-gardes of the early 20th century, the neo-avant-gardes of the 1960s and new technologies. I adopt as methodological procedures the bibliographical review to draw a historical overview of the concept, the translation method to describe the two videodance works, the content analysis method to code and make inferences about the composition procedures used by the filmmaker in both works and a semi-structured interview to investigate the subtleties of his creative process. Based on the data obtained from the analysis of the works, the interview responses and the concepts developed in the historical review, I present a reflection on the composition process of the two videodances and propose a possible characterization of their poetics
Obtenção de catalisadores baseados em Nb2O5 modificado com cobalto para aplicação em produção de H2 via hidrólise de borohidreto de sódio.
No full textPrograma de Pós-Graduação em Química. Departamento de Química, Instituto de Ciências Exatas e Biológicas, Universidade Federal de Ouro Preto.Este trabalho aborda a síntese e caracterização de catalisadores à base de nióbio e cobalto para
a hidrólise de borohidreto de sódio (NaBH4) visando a produção de hidrogênio. O estudo
envolveu a produção de óxido de nióbio puro pelo método de precipitação e sua modificação
com cobalto por adsorção de sal, seguida de redução com NaBH4. Além disso, utilizou-se óxido
de nióbio comercial como padrão de referência. A caracterização estrutural e morfológica dos
catalisadores foi realizada utilizando diversas técnicas, incluindo difratometria de raios X
(DRX), espectroscopia de fotoelétrons excitados por raios X (XPS), espectroscopia na região
do infravermelho (IV), fisissorção de N2, análise térmica (TGA), microscopia eletrônica de
varredura (MEV), absorção atômica (AAS) e espalhamento de luz dinâmico (DLS). Os
catalisadores foram avaliados na produção de hidrogênio via hidrólise de NaBH4 em diferentes
condições reacionais. Os resultados indicam que os catalisadores Nb2O5 Sint. e Nb2O5/Co Sint.
exibem padrões de difração característicos de materiais amorfos, enquanto Nb2O5 Com. e
Nb2O5/Co Com. apresentam picos de difração associados à estrutura ortorrômbica do Nb2O5.
Os catalisadores sintetizados demonstraram áreas superficiais significativamente maiores em
comparação com o óxido de nióbio comercial, o que pode ter facilitado uma maior incorporação
de cobalto na estrutura do Nb2O5 durante a formação dos compósitos. A técnica de absorção
atômica revelou que os compósitos Nb2O5/Co Sint. e Nb2O5/Co Com. contêm 5,8% e 0,14% de
Co, respectivamente. Nos testes catalíticos, o catalisador Nb2O5/Co Sint. demonstrou maior
atividade na produção de H2 em meio básico em comparação com os outros catalisadores, com
uma evolução de aproximadamente 250 mL de H2 em 60 minutos, destacando-se pela
estabilidade ao longo de seis ciclos de reação. A atividade superior do Nb2O5/Co Sint. está
relacionada à presença de grupos OH e Co na superfície do catalisador, onde a hidrólise de
NaBH4 e a evolução de H2 ocorrem através do mecanismo de Langmuir–Hinshelwood.This work addresses the synthesis and characterization of niobium and cobalt-based catalysts
for the hydrolysis of sodium borohydride (NaBH4), aiming at the production of hydrogen. The
study involved the production of pure niobium oxide by the precipitation method and its
modification with cobalt by salt adsorption, followed by reduction with NaBH4. Furthermore,
commercial niobium oxide was used as a reference standard. The structural and morphological
characterization of the catalysts was carried out using several techniques, including X-ray
diffractometry (XRD), X-ray photoelectron spectroscopy (XPS), infrared spectroscopy (IR), N2
physisorption, thermal analysis (TGA), scanning electron microscopy (SEM), atomic
absorption spectroscopy (AAS), and dynamic light scattering (DLS). The catalysts were
evaluated in the production of hydrogen via hydrolysis of NaBH4 under different reaction
conditions. The results indicate that Nb2O5 Sint. and Nb2O5/Co Sint. exhibit diffraction patterns
characteristic of amorphous materials, while Nb2O5 Com. and Nb2O5/Co Com. present
diffraction peaks associated with the orthorhombic structure of Nb2O5. The synthesized
catalysts demonstrated significantly larger surface areas compared to commercial niobium
oxide, which may have facilitated greater incorporation of cobalt into the Nb2O5 structure
during the formation of the composites. The atomic absorption technique revealed that
Nb2O5/Co Sint. and Nb2O5/Co Com. contain 5.8% and 0.14% Co, respectively. In catalytic
tests, Nb2O5/Co Sint. demonstrated greater activity in the production of H2 in basic media
compared to the other catalysts, with an evolution of approximately 250 mL of H2 in 60 minutes,
standing out for its stability over six reaction cycles. The superior activity of Nb2O5/Co Sint. is
related to the presence of OH and Co groups on the catalyst surface, where the hydrolysis of
NaBH4 and the evolution of H2 occur through the Langmuir–Hinshelwood mechanism
Endividamento público e flutuações regionais no Brasil.
No full textPrograma de Pós-Graduação em Economia Aplicada. Departamento de Ciências Econômicas e Gerenciais, Instituto de Ciências Sociais Aplicadas, Universidade Federal de Ouro Preto.A discussão acerca das políticas monetária, fiscal e cambial ganhou destaque
devido ao cenário político recente. Divergências nas abordagens governamentais para
enfrentar os desafios do Brasil suscitam reflexões sobre as ações adotadas,
especialmente em relação à dívida pública. Um relatório do Banco Central Brasileiro
previa, em 2002, que a relação Dívida/PIB atingiria 81% em 2011, potencialmente
gerando um déficit fiscal significativo e impactando o crescimento econômico. Este
artigo tem como foco investigar os possíveis efeitos da dívida pública nos ciclos
econômicos das unidades federativas. Utilizando dados trimestrais do Sistema de Séries
Temporais do Banco Central Brasileiro de 2007 a 2020 para 13 estados, sendo eles:
Amazonas (AM), Bahia (BA), Ceara (CE), Espirito Santo (ES), Goiás (GO), Minas
Gerais (MG), Pará (PA), Pernambuco (PE), Paraná (PR), Rio de Janeiro (RJ), Rio
Grande do Sul (RS), Santa Catarina (SC) e São Paulo (SP). Os resultados indicam um
crescimento da dívida, apesar da ausência de fortes oscilações ao longo do período
analisado.The discussion about monetary, fiscal and exchange rate policies gained
prominence due to the recent political scenario. Divergences in governmental
approaches towards facing Brazil's challenges raise reflections upon the actions
adopted, especially regarding public debt. A report from the Brazilian Central Bank
predicted, in 2002, that the Debt/GDP ratio would reach 81% in 2011, potentially
generating a significant fiscal deficit and impacting economic growth. This paper
focuses on investigating the possible effects of public debt on the economic cycles of
federative units. The data hereby introduced stems from the Time Series System of the
Brazilian Central Bank from 2007 to 2020 for 13 states, namely: Amazonas (AM),
Bahia (BA), Ceara (CE), Espirito Santo (ES), Goiás (GO), Minas Gerais (MG), Pará
(PA), Pernambuco (PE), Paraná (PR), Rio de Janeiro (RJ), Rio Grande do Sul (RS),
Santa Catarina (SC) and São Paulo (SP). The results indicate an increase in debt, despite
the absence of strong fluctuations throughout the period analyzed
Toxicidade do glifosato para o mexilhão dourado.
No full textPrograma de Pós-Graduação em Ciências – Física de Materiais. Departamento de Física, Instituto de Ciências Exatas e Biológicas, Universidade Federal de Ouro Preto.O mexilhão dourado, Limnoperna fortunei (Dunker, 1857) uma espécie invasora que
chegou à América do Sul na década de 1990, tem causado impactos significativos nos
ecossistemas aquáticos brasileiros. Este estudo investigou o potencial do herbicida
glifosato como uma ferramenta para controlar as populações de mexilhões dourados,
cuja proliferação resulta em danos ambientais e econômicos. Dois experimentos
foram conduzidos para avaliar os efeitos tóxicos do glifosato nos mexilhões dourados,
revelando uma correlação direta entre a concentração do herbicida e a mortalidade
dos organismos. A análise estatística fortaleceu essas observações, indicando
diferenças significativas nos resultados. Além disso, discutiu-se a viabilidade do uso
do glifosato na contenção das incrustações de mexilhões dourados e explorou a
possibilidade de utilizar esses moluscos como modelo de estudo em laboratório. Os
achados destacam a importância de considerar abordagens ambientalmente
sustentáveis para lidar com a disseminação do mexilhão dourado, enquanto ressaltam
o potencial do glifosato como uma opção de controle.The golden mussel, Limnoperna fortunei (Dunker, 1857), an invasive species that
reached South America in the 1990s, has caused significant impacts on Brazilian
aquatic ecosystems. This study investigated the potential of the herbicide glyphosate
as a tool to control golden mussel populations, whose proliferation results in
environmental and economic damages. Two experiments were conducted to assess
the toxic effects of glyphosate on golden mussels, revealing a direct correlation
between the herbicide concentration and organism mortality. Statistical analysis
strengthened these observations, indicating significant differences in the results.
Additionally, the feasibility of using glyphosate to contain golden mussel encrustations
was discussed, and the possibility of using these mussels as a laboratory study model
was explored. The findings highlight the importance of considering environmentally
sustainable approaches to address the spread of the golden mussel, while
emphasizing the potential of glyphosate as a control option
The theoretical and methodological trends in productions on the family and the foundations of social work.
No full textO artigo apresenta parte dos resultados da pesquisa que analisou as produções teóricas do Serviço Social brasileiro sobre família, publicadas nos principais periódicos da profissão, a fim de identificar os fundamentos teórico-metodológicos. Trata-se de pesquisa bibliográfica, com ênfase qualitativa, ancorada no materialismo histórico-dialético, a partir da leitura e análise de artigos publicados nas revistas A e B (Qualis Capes 2013–2016). Os resultados da pesquisa confirmaram a existência de várias perspectivas conflitantes na profissão expressando fundamentos que coadunam com projeto ético-político, como também tendências que vão na contramão de um trabalho profissional crítico com famílias.The article presents part of the results of the research that analyzed the theoretical productions of the Brazilian Social Work on the family, published in the main journals of the profession, in order to identify the theoretical-methodological foundations. This is bibliographic research, with a quantitative and qualitative emphasis, anchored in dialectical historical materialism, based on the reading and analysis of articles published in magazines A and B (Qualis Capes 2013–2016). The research results confirmed the existence of several conflicting perspectives in the profession, expressing fundamentals that agree with an ethical political project, as well as trends that go against critical professional work with families
Effects of oral HPΒCD-angiotensin-(1-7) supplementation on recreational mountain bike athletes : a crossover study.
No full textBackground: Supplementation with Angiotensin-(1-7) [(Ang-1-7)] has received considerable attention due to its possible ergogenic effects on physical performance. The effects of a single dose of Ang-(1-7) on the performance of mountain bike (MTB) athletes during progressive load tests performed until the onset of voluntary fatigue have previously been demonstrated. This study tested the effects of Ang-(1- 7) in two different exercise protocols with different metabolic demands: aerobic (time trial) and anaerobic (repeated sprint). Methods: Twenty one male recreational athletes were given capsules containing an oral formulation of HPβCD-Ang-(1-7) (0.8 mg) and HPβCD-placebo (only HPβCD) over a 7-day interval; a double-blind randomized crossover design was used. Physical performance was examined using two protocols: a 20- km cycling time trial or 4 × 30-s repeated all-out sprints on a leg cycle ergometer. Data were collected before and after physical tests to assess fatigue parameters, and included lactate levels, and muscle activation during the sprint protocol as evaluated by electromyography (EMG); cardiovascular parameters: diastolic and systolic blood pressure and heart rate; and performance parameters, time to complete (time trial), maximum power and mean power (repeated sprint). Results: Supplementation with an oral formulation of HPβCD-Ang-(1-7) reduced basal plasma lactate levels and promoted the maintenance of plasma glucose levels after repeated sprints. Supplementation with HPβCD-Ang-(1-7) also increased baseline plasma nitrite levels and reduced resting diastolic blood pressure in a time trial protocol. HPβCD-Ang-(1-7) had no effect on the time trial or repeat sprint performance, or on the EMG recordings of the vastus lateralis and vastus medialis. Conclusions: Supplementation with HPβCD-Ang-(1-7) did not improve physical performance in time trial or in repeated sprints; however, it promoted the maintenance of plasma glucose and lactate levels after the sprint protocol and at rest, respectively. In addition, HPβCD-Ang-(1-7) also increased resting plasma nitrite levels and reduced diastolic blood pressure in the time trial protocol. Trial registration: RBR-2nbmpbc, registered January 6th, 2023. The study was prospectively registered
Briquetting of manganese ore fines with cement as binder.
No full textThis study develops briquettes from fines generated in the processing of manganese ore from a strategic manganeferous district of Minas Gerais–Brazil. The briquettes were produced based on the following variables: compaction pressure (20 and 25MPa), curing time (7 and 28 days), percentage by mass of binder (5% and 10%), and replace
ment with tailings (0% and 10%). Technological tests evaluated the compressive, abrasion, impact strength and water absorption. The best conditions for briquette included 10% Portland cement, 10% Mn tailings, compaction pressure of 25MPa and 7 days of curing, as well as 10% Portland cement, compaction pressure of 25MPa and 28 days of curing. The briquettes primarily contained the spessartine, todorokite, quartz, and pyrolusite minerals. The storage time tests indicated that the briquettes responded satisfactorily to storage for three months in a dry environment and at room temperature.
Through crackling tests, the briquettes have potential to be commercially used