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Search Results: 1 - 10 of 54759 matches for " Marcio Antonio Ferreira Camargo "
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Effects of Caffeine on the Organism—Literature Review  [PDF]
Marcio Antonio Ferreira Camargo, Carmen Aparecida Cardoso Maia Camargo
Open Access Library Journal (OALib Journal) , 2019, DOI: 10.4236/oalib.1105265
Abstract:
Caffeine is the most widely consumed stimulant. Caffeine is known to in-crease energetic metabolism throughout the brain, but it also decreases cerebral blood flow, inducing relative cerebral hypoperfusion. Caffeine ac-tivates norepinephrine neurons and appears to affect the local release of dopamine. Many of the warning effects of caffeine may be related to the action of methylxanthine on serotonin neurons. In this sense, this study aimed to identify the main effects of caffeine on the body. This is a literature review study addressing the main effects of caffeine on the body. In order to select the studies, an online survey of articles has been conducted on sites such as the Scientific Electronic Library Online (SciELO), Medical Literature Analysis and Retrieval System Online (MEDLINE) and Latin American and Caribbean Literature in Health Sciences (LILACS), using the descriptors “caffeine”, “effects of caffeine” and “methylxanthine”. We included the studies published between the years 2000 to 2018, which explicitly contemplate the evaluated aspects. In general, caffeine has effects on anxiety and sleep that vary according to individual sensitivity to methylxanthine. The central nervous system does not appear to develop a great tolerance to the effects of caffeine, although the symptoms of dependence and withdrawal are reported.
The Good Teacher of High School in the Representation of the Students Body  [PDF]
Carmen Aparecida Cardoso Maia Camargo, Marcio Antonio Ferreira Camargo
Open Access Library Journal (OALib Journal) , 2019, DOI: 10.4236/oalib.1105428
Abstract:
The present study aims to analyze the representations about the good teacher in the eyes of the students of the third grade of High School. The empirical material was obtained through a semi-structured interview and questionnaire, with forty-nine students of the 3rd year of high school, from two public schools located in the interior of the State of Minas Gerais, Brazil. The research carried out is of a qualitative approach, using the concept of social representation. The evaluations of the representations referring to what the students consider as “good teacher” allowed to identify attributes related to the personal attitude of the teacher, as well as their pedagogical action, that is, what was called attributes of the scope of the BE and the DOING of the teacher. It was verified that in the opinion of the students, the good teacher is the one who has mastery of contents of the taught discipline and good didactics, as well as accomplishes his teaching task through a good relationship with the students. The research contributed to highlight the importance of establishing adequate interpersonal relationships in the constitution of the representation that the students have regarding a “Good Teacher”. This finding has implications for the training of high school teachers.
Evaluation of Concentrations of Heavy Metals in Water Used in Agricultural Irrigation  [PDF]
Marcio Antonio Ferreira Camargo, Thaiany Aparecida Ribeiro Pereira
Open Access Library Journal (OALib Journal) , 2018, DOI: 10.4236/oalib.1104959
Abstract:
The knowledge about toxic levels of toxic heavy metals in irrigation water is very scarce and quite varied. This work aimed to evaluate the concentrations of toxic heavy metals in the lake of the Experimental Farm UEMG, Passos-MG Unit. The toxic heavy metals evaluated were Cadmium (Cd), Chromium (Cr) and Lead (Pb). The lagoon was divided into ten strategic points for sampling, each point being sampled in triplicate. The pH of the water and the concentrations of toxic heavy metals present were evaluated. PH measurements were performed on the water in natura, being measured before and after filtration. Values ranging from 6.25 to 7.75 were found. For the determinations of Cd, Cr, and Pb, an Atomic Absorption Spectrophotometer was used. The samples were treated with acid digestion. The values of toxic heavy metals found were: Cadmium: 0.727 mg/L at 0.754 mg/L; Chromium: 0.177 mg/L at 0.256 mg/L and Lead: 0.023 mg/L at 0.081 mg/L. These values are above the limit established by CONAMA 357/2005. The dangers of contamination of water by toxic heavy metals are not restricted only to the direct consumption of this water, but also to the consequences in the food chain when we refer to bioaccumulative toxicants.
Evaluation on the Concentration of Heavy Metals in Surface Waters in the Municipality of Pratápolis-MG  [PDF]
Daniel Henrique Rattis Lemos, Carmen Aparecida Cardoso Maia Camargo, Marcio Antonio Ferreira Camargo, Maria Diva Landgraf
Open Access Library Journal (OALib Journal) , 2019, DOI: 10.4236/oalib.1105427
Abstract:
Mining causes numerous environmental impacts; among them we have to mention the water contamination due to the residues inherent to the activity. “Morro do Níquel”, a mining site, located in southwest Minas Gerais, Brazil, has promoted an increase in the mining activity in the region. There has also been an increase in the amount of residues and substrates produced with the intensification of the mining activity. Being a purification derivative and the extracted minerals processing, the heavy metals have been accumulating in the ecosystem, being able to interfere with the population’s quality of life and health in the municipality of Pratápolis. Heavy metals are a class of highly reactive and some toxic substances. Such toxicity is caused by the inability of the organism to metabolize them, leading to bioaccumulation. Therefore, the present research aims to determine the presence of heavy metals in the surface water, supplying water and irrigation water in the city of Pratápolis-MG, in addition to evaluating the water quality through physical and chemical analyzes.
Removal of Textile Dyes Present in Effluents by Adsorption in Polyurethane Foams Derived from Vegetable Oil  [PDF]
Daniel Henrique Rattis Lemos, Carmen Aparecida Cardoso Maia Camargo, Marcio Antonio Ferreira Camargo
Open Access Library Journal (OALib Journal) , 2019, DOI: 10.4236/oalib.1105481
Abstract:
Large amounts of effluents, some even untreated, used in the dyeing in-dustries are dumped into natural water provoking a huge environmental impact daily. The Analytical Chemistry and Polymer Technology Group from the University of Sao Paulo in Sao Carlos, Brazil developed the polyurethane foam. It is a unique type of foam produced from vegetable oil—a renewable natural raw material. The objective of the research was to verify the effectiveness of adsorption of textile dyes in effluents through the polyurethane foam derived from vegetable oil. The dye samples collected from an industry in the dying segment in the city of Passos, Minas Gerais State, Brazil, were prepared in various predetermined concentrations. The percolation in thermostatic glass column containing polyurethane foam derived from vegetable oil was used as analytical method, with known mass, pressed in the form of powder between two solid foam disks containing two millimeters of thickness.
Classroom: A Space of Pedagogical Interaction  [PDF]
Carmen Aparecida Cardoso Maia Camargo, Marcio Antonio Ferreira Camargo, Márcio Ferreira de Carvalho, Clere Ventura Costa Oliveira
Open Access Library Journal (OALib Journal) , 2018, DOI: 10.4236/oalib.1104958
Abstract:
Classroom is a socially instituted space of pedagogical intervention. This article aims to analyze how the interdisciplinary dialogue between teachers, in the classroom and outside of the classroom, in order to approach theory and practice in the teaching knowledge. It is part of a research project developed in 2017 in a Community Course, in the city of Passos-MG, Brazil. Based on a qualitative approach, there was an exploratory and descriptive design involving semi-structured interviews with eight teachers. Content analysis was used to treat the data. From the data found, it was evident that the general recognition of the teachers about the necessity and importance of the adequacy of teaching methods in relation to the interdisciplinarity in the teaching routine makes it a tool of approximation between the student and the learning. On the other hand, the interviewees identified some difficulties in programming interdisciplinary practices, such as understanding the importance of dialogue with content in everyday practice and the excessive daily demands of teaching work that prevent the involvement of all educators. However, they are unanimous in emphasizing the need to create joint pedagogical strategies, seeking a more meaningful knowledge for the student.
Stress and Suffering at Work: Possible Causes  [PDF]
Carmen Aparecida Cardoso Maia Camargo, Marcio Antonio Ferreira Camargo, Thaís Alves Rodrigues, Thuane Celly Silva, Maria Ambrosina Cardoso Maia
Open Access Library Journal (OALib Journal) , 2019, DOI: 10.4236/oalib.1105358
Abstract:
The objective of this article is to analyze the possible sources of suffering in the work and its consequences, as specific objectives to evaluate the emotional state of the employees, to analyze the dissatisfaction in the work and its consequences. The methodology adopted was the descriptive, ex-ploratory, quantitative approach. The article is part of field research carried out in companies of the fashion sector of the Passos city—MG, Brazil. For data collection, a questionnaire elaborated by the researchers was used, addressing questions related to the research problem. The data collected indicated evidence of psychic suffering and stress situations, triggered by the prevalence of psychosocial symptoms, such as muscle tension, forgetfulness, anxiety, irritability, and sleep disturbances.
Polyurethane Foams Derived from Vegetable Oil Used in the Adsorption of Polychlorinated Biphenyls Present in Insulating Mineral Oil  [PDF]
Marcio Antonio Ferreira Camargo, Antonia Marli dos Santos, Gilberto Orivaldo Chierice, Salvador Claro Neto, Maria Diva Landgraf
Open Access Library Journal (OALib Journal) , 2018, DOI: 10.4236/oalib.1104945
Abstract:
PCBs, polychlorinated biphenyls (polychlorinated biphenyls), are the generic names given to the class of organochlorine compounds resulting from the reaction of the biphenyl group with anhydrous chlorine in the presence of a catalyst. They are toxic, persistent, bioaccumulative and pose the risk of causing harm to human health and the environment. Large quantities of PCBs were produced in several countries between 1927 and 1977. In the United States the prohibition occurred in 1977. Due to high toxicity, production and marketing of PCBs have been banned worldwide since 1980. It was carried out at the Chemistry Institute of Sao Carlos—University of Sao Paulo, and developed a procedure for decontamination of mineral insulating oil containing PCBs values above 50 mg/kg. In the procedure, the contaminated oil was passed by percolation in a column containing polyurethane foam derived from vegetable oil, produced by the Laboratory of Analytical Chemistry and Polymer Technology (GQATP), thus obtaining a 55% reduction in the levels of PCBs.
Advances in the Treatment of Textile Effluents: A Review  [PDF]
Marco Antonio Covi Júnior, Andressa Graciele dos Santos, Elias de Paulo Silva, Guilherme Franqueiro Maimoni, Helísa Naves Martins, Maria Luiza de Moura Assis, Carmen Aparecida Cardoso Maia Camargo, Marcio Antonio Ferreira Camargo
Open Access Library Journal (OALib Journal) , 2019, DOI: 10.4236/oalib.1105549
Abstract:
The textile industry moves the economy of several countries, being of great importance for the internal market and also for the external market, but it is considered one of the industries that consume a greater volume of water in its productive process, being one of the largest producers of effluents. Effluents from the textile industries carry toxic, mutagenic and potentially carcinogenic substances, and are resistant to chemical and/or biological degradation, pre-venting traditional effluent treatment methodologies from removing significant quantities of these molecules, compromising the quality of receiving water bodies. The present work aims to demonstrate the conventional methodologies used in the treatment of effluents from textile industries and present new technologies discovered for this purpose and present a greater efficiency in the removal of the dyes used in the productive chain of these industries.
Toxoplasmosis and the laboratory: diagnosis and a constant striving for improvement
FERREIRA Antonio Walter,CAMARGO Mário E.
Revista do Instituto de Medicina Tropical de S?o Paulo , 2002,
Abstract:
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