Chemical Laboratories
Mostrando 1-12 de 100 artigos, teses e dissertações.
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1. Bioactive compounds, bromatological and mineral characterization of blackberries in a subtropical region
ABSTRACT Given the above, the objective of this study was to evaluate the bromatological, mineral and bioactive compounds of blackberry grown in a subtropical region. Blackberries fruits (Rubus sp.), Grown in an orchard of Unioeste, Campus Marechal Cândido Rondon (Paraná, Brazil), were used. Immediately after harvest, the fruits were taken to the Food Tech
Revista Ceres. Publicado em: 2022
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2. Analysis of carbonation and hydration of BOF steel slag for application as railway ballast
Abstract The reutilization of waste is a valuable alternative for the preservation of natural resources and the environment. In this sense, Basic Oxygen Furnace (BOF) steel slag is one of the most residues generated in steel the industry. It is estimated that for each ton of steel produced, about 150 kg of steel slag is generated in the BOF process. Generall
REM, Int. Eng. J.. Publicado em: 2020-12
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3. Outbreaks of nutritional cardiomyopathy in pigs in Brazil
RESUMO: Cardiomiopatia dilatada (CMD) é uma condição que afeta o miocárdio, raramente relatada em porcos. A DCM é caracterizada por dilatação ventricular, que resulta em disfunção sistólica e disfunção diastólica secundária e pode levar a arritmias e insuficiência cardíaca congestiva fatal. Este estudo descreve os achados clínicos, patológi
Pesq. Vet. Bras.. Publicado em: 13/10/2019
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4. Natural Fertility and Metals Contents in Soils of Rio Grande do Sul (Brazil)
ABSTRACT: The parent geological materials and formation factors influence the chemical, physical, and mineralogical properties and composition of the soil. Therefore, the aims of this study were to determine the chemical and some physical and mineralogical properties of the soil useful for agricultural practice; to determine the natural contents of the semit
Rev. Bras. Ciênc. Solo. Publicado em: 01/02/2018
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5. Organic Synthesis: New Vistas in the Brazilian Landscape
ABSTRACT In this overview, we present our analysis of the future of organic synthesis in Brazil, a highly innovative and strategic area of research which underpins our social and economical progress. Several different topics (automation, catalysis, green chemistry, scalability, methodological studies and total syntheses) were considered to hold promise for t
An. Acad. Bras. Ciênc.. Publicado em: 2018
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6. Pictogramas do GHS e sua aplicação como ferramenta de comunicação de perigos para estudantes de graduação
Regularly, teaching laboratories use chemicals hazardous to health. Students must be aware of such hazards, to safely perform didactic experiments. The Globally Harmonized System of Classification and Labelling of Chemicals (GHS) is a hazard communication tool designed to harmonize the classification with a standardized labeling system worldwide. This work a
Quím. Nova. Publicado em: 2017-04
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7. TLC/IR (UATR) off-line coupling for the characterization of additives in EPDM rubber compositions
Abstract The knowledge of the components that constitutes a rubber composition is important to justify the properties of the final device, particularly when it comes to elastomeric compositions used in the aerospace industry. The development of methodologies that can detect components, specially the smallest proportion of the rubbers composition is a constan
Polímeros. Publicado em: 04/03/2016
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8. USO DE SÍLICAS MODIFICADAS PARA IMOBILIZAÇÃO DE LIPASES
Enzyme-support strategies are increasingly replacing conventional chemical methods in both laboratories and industries with attributes including efficiency, higher performance and multifarious use, where silica surfaces show potential due to the chemical bonds based on the presence of hydroxyl groups which can be modified with different additives. Surface-mo
Quím. Nova. Publicado em: 2015-03
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9. Metrological Traceability of Measurement Results in Pharmaceutical and Chemical Sciences: Selection and Use of Certified Reference Materials
Metrological traceability is a key technical requirement of the ISO/IEC 17025:2005 standard, applied to calibration and testing laboratories that intend to prove their technical competence. In this work, the concept of metrological traceability is discussed, with focus on chemical and pharmaceutical testing laboratories. Practical recommendations for the sel
J. Braz. Chem. Soc.. Publicado em: 2015-02
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10. ENZYMATIC RESOLUTION OF ANTIDEPRESSANT DRUG PRECURSORS IN AN UNDERGRADUATE LABORATORY
The use of biocatalysts in synthetic chemistry is a conventional methodology for preparing enantiomerically enriched compounds. Despite this fact, the number of experiments in chemical teaching laboratories that demonstrate the potential of enzymes in synthetic organic chemistry is limited. We describe a laboratory experiment in which students synthesized a
Quím. Nova. Publicado em: 2015-02
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11. Avaliação da "microverdura" de sínteses com a estrela verde
This article reports a study to increase the overall greenness of chemical syntheses for first-year university laboratories. The separate evaluation of the micro-greenness of the three stages of synthesis (reaction, isolation and purification) using the Green Star (GS) was implemented and their respective contribution to overall greenness was investigated fo
Quím. Nova. Publicado em: 2014-07
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12. Produtos químicos perigosos utilizados em laboratórios de ensino: proposta e exemplos para indicação de seus perigos no rótulo
Typically hundreds of different chemical products stored in small flasks which cannot accommodate labels large enough to bear all information required by the Globally Harmonised System of Classification, Labelling and Packaging of Chemicals (GHS) are used in academic laboratories. To overcome this restriction Brazilian legislation permits communication of th
Quím. Nova. Publicado em: 2013