Pub Date : 2022-01-01DOI: 10.21577/1984-6835.20230004
Rodrigo Santos Aquino de Araújo, Liliana Pontes, Karoline Ferreira Barbosa, Karen C. Weber, C. Lima‐Junior
{"title":"Flipped Classroom and Station Rotation Model: A Brief Review of Their Applications in Science Teaching","authors":"Rodrigo Santos Aquino de Araújo, Liliana Pontes, Karoline Ferreira Barbosa, Karen C. Weber, C. Lima‐Junior","doi":"10.21577/1984-6835.20230004","DOIUrl":"https://doi.org/10.21577/1984-6835.20230004","url":null,"abstract":"","PeriodicalId":21315,"journal":{"name":"Revista Virtual de Química","volume":"32 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87147918","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-01-01DOI: 10.21577/1984-6835.20220036
Paula Carolina Pires Bueno
{"title":"The Nobel Prize, knowledge and scientific diplomacy","authors":"Paula Carolina Pires Bueno","doi":"10.21577/1984-6835.20220036","DOIUrl":"https://doi.org/10.21577/1984-6835.20220036","url":null,"abstract":"","PeriodicalId":21315,"journal":{"name":"Revista Virtual de Química","volume":"53 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84868249","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-01-01DOI: 10.21577/1984-6835.20230009
Rafael. Q. M. Paula, Diego M. Veneu, Felipe S. dos Santos, L. Yokoyama, Cristiane R. Mauad
{"title":"Cattle Farm Wastewater Treatment by Vertical Flow Constructed Wetland System","authors":"Rafael. Q. M. Paula, Diego M. Veneu, Felipe S. dos Santos, L. Yokoyama, Cristiane R. Mauad","doi":"10.21577/1984-6835.20230009","DOIUrl":"https://doi.org/10.21577/1984-6835.20230009","url":null,"abstract":"","PeriodicalId":21315,"journal":{"name":"Revista Virtual de Química","volume":"107 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89357671","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-01-01DOI: 10.1515/ci.2010.32.1.36b
Vitor Francisco Ferreira
{"title":"Chemistry for Sustainable Development","authors":"Vitor Francisco Ferreira","doi":"10.1515/ci.2010.32.1.36b","DOIUrl":"https://doi.org/10.1515/ci.2010.32.1.36b","url":null,"abstract":"","PeriodicalId":21315,"journal":{"name":"Revista Virtual de Química","volume":"48 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87239214","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-01-01DOI: 10.21577/1984-6835.20220097
Glaucia M. C. Duarte, Fernando S. Lameiras
Banded iron formations are exploited in the Iron Quadrangle of Minas Gerais, Brazil. To produce the iron ore concentrate these iron formations are processed by a physicochemical process. Huge amounts of tailings are generated and stored in dams. After two major collapses of dams in 2015 and 2019 with severe loss of lives and environmental impacts, the storage in new dams was prohibited. The storage of tailings in piles or exhausted open pits and their utilization as raw materials to produce several products are being considered. The huge amount of tailings and their characteristics, especially the fine granulometry, are the challenges that scientists and engineers must face to develop applications for them. Research and developments carried out to address the issue of these tailings in the region of the Iron Quadrangle are presented in this paper.
{"title":"Challenges for the Destiny of Iron Mining Tailings in the Iron Quadrangle of Minas Gerais, Brazil","authors":"Glaucia M. C. Duarte, Fernando S. Lameiras","doi":"10.21577/1984-6835.20220097","DOIUrl":"https://doi.org/10.21577/1984-6835.20220097","url":null,"abstract":"Banded iron formations are exploited in the Iron Quadrangle of Minas Gerais, Brazil. To produce the iron ore concentrate these iron formations are processed by a physicochemical process. Huge amounts of tailings are generated and stored in dams. After two major collapses of dams in 2015 and 2019 with severe loss of lives and environmental impacts, the storage in new dams was prohibited. The storage of tailings in piles or exhausted open pits and their utilization as raw materials to produce several products are being considered. The huge amount of tailings and their characteristics, especially the fine granulometry, are the challenges that scientists and engineers must face to develop applications for them. Research and developments carried out to address the issue of these tailings in the region of the Iron Quadrangle are presented in this paper.","PeriodicalId":21315,"journal":{"name":"Revista Virtual de Química","volume":"69 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87212095","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-01-01DOI: 10.21577/1984-6835.20220119
Raquel Miranda dos Santos, Karolina Lima Nogueira, V. Chapla
The present work aimed to evaluate the chemical composition of the essential oils of two species found in the Cerrado of Tocantins State, Brazil. The essential oil of Schinus terebinthifolius (aroeira) and Siparuna guianensis (negramina) were obtained from the leaves by hydrodistillation, using the Clevenger apparatus, with a yield of 0.16% v/w and 0.20% v/w, respectively. Sixteen and twenty constituents were identified by gas-chromatography coupled to mass spectrometry (GC-MS) in the essential oils from S. terebinthifolius and S. guianensis , respectively, most of them being monoterpenes in both essential oils. The main volatile constituent of S. terebinthifolius essential oil was identified as D-limonene with 12.09%, while for S. guianensis , β -myrcene was identified as the major constituent, with 79.47%. The antioxidant activity was determined using the DPPH method in thin layer chromatography, and both essential oils were active. However, the allelopathic activity using lettuce seeds was not evidenced for both essential oils.
{"title":"Chemical Composition and antioxidant activity of Essential Oil from Schinus terebinthifolius and Siparuna guianensis Leaves","authors":"Raquel Miranda dos Santos, Karolina Lima Nogueira, V. Chapla","doi":"10.21577/1984-6835.20220119","DOIUrl":"https://doi.org/10.21577/1984-6835.20220119","url":null,"abstract":"The present work aimed to evaluate the chemical composition of the essential oils of two species found in the Cerrado of Tocantins State, Brazil. The essential oil of Schinus terebinthifolius (aroeira) and Siparuna guianensis (negramina) were obtained from the leaves by hydrodistillation, using the Clevenger apparatus, with a yield of 0.16% v/w and 0.20% v/w, respectively. Sixteen and twenty constituents were identified by gas-chromatography coupled to mass spectrometry (GC-MS) in the essential oils from S. terebinthifolius and S. guianensis , respectively, most of them being monoterpenes in both essential oils. The main volatile constituent of S. terebinthifolius essential oil was identified as D-limonene with 12.09%, while for S. guianensis , β -myrcene was identified as the major constituent, with 79.47%. The antioxidant activity was determined using the DPPH method in thin layer chromatography, and both essential oils were active. However, the allelopathic activity using lettuce seeds was not evidenced for both essential oils.","PeriodicalId":21315,"journal":{"name":"Revista Virtual de Química","volume":"20 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77733980","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-01-01DOI: 10.21577/1984-6835.20220111
Maria Clara R. de Souza, Brenda Ramos Freitas, Ana Paula de S. Figueiredo, Henrique Jordem Venial, Patricia Gon Corradini, Murilo de Oliveira Souza
as cyclones, thermal inversion, melting glaciers, and rising sea levels, are associated with the uncontrolled emission of different VOCs in the atmosphere. Therefore, the main objective of this work was to evaluate the influence of VOCs on climate change, in addition to proposing some sustainable strategies to mitigate the release of these pollutants into the atmosphere, in order to control the increase in global warming and reduce the incidence of chemical and climatic phenomena, that become more frequent in the current scenario.
{"title":"The Influence of Volatile Organic Compounds on Climate Change: A brief review","authors":"Maria Clara R. de Souza, Brenda Ramos Freitas, Ana Paula de S. Figueiredo, Henrique Jordem Venial, Patricia Gon Corradini, Murilo de Oliveira Souza","doi":"10.21577/1984-6835.20220111","DOIUrl":"https://doi.org/10.21577/1984-6835.20220111","url":null,"abstract":"as cyclones, thermal inversion, melting glaciers, and rising sea levels, are associated with the uncontrolled emission of different VOCs in the atmosphere. Therefore, the main objective of this work was to evaluate the influence of VOCs on climate change, in addition to proposing some sustainable strategies to mitigate the release of these pollutants into the atmosphere, in order to control the increase in global warming and reduce the incidence of chemical and climatic phenomena, that become more frequent in the current scenario.","PeriodicalId":21315,"journal":{"name":"Revista Virtual de Química","volume":"51 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74603773","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-01-01DOI: 10.21577/1984-6835.20220060
Emanuella F. C. dos Santos, Raychimam D. S. Bezerra, Wellington L. S. Araujo
with the release of ions by dissolution, wear, corrosion, or physical and mechanical incompatibility, this interaction should not be harmful to the organism. The present research focused in to bring together the trends, advantages and disadvantages of cobalt and chromium alloys, used in medical treatments to improve the quality of life for many patients worldwide.
{"title":"Cobalt and Chrome Alloys Used in Biomedical Applications","authors":"Emanuella F. C. dos Santos, Raychimam D. S. Bezerra, Wellington L. S. Araujo","doi":"10.21577/1984-6835.20220060","DOIUrl":"https://doi.org/10.21577/1984-6835.20220060","url":null,"abstract":"with the release of ions by dissolution, wear, corrosion, or physical and mechanical incompatibility, this interaction should not be harmful to the organism. The present research focused in to bring together the trends, advantages and disadvantages of cobalt and chromium alloys, used in medical treatments to improve the quality of life for many patients worldwide.","PeriodicalId":21315,"journal":{"name":"Revista Virtual de Química","volume":"223 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76292405","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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