cometadata/datacite-titles-descriptions-related-identifiers huggingface dataset:
DOI: 10.6084/m9.figshare.21679268.v1
title: Microtensile bond strength of resin composite to dentin using different adhesive systems and directions of electric current

description: Abstract Thisstudy aimed to evaluate the effect of the electric current direction application on the resin composite-dentin bond strength using three adhesive systems. Human molar teeth were distributed according to the adhesive system (two-step self-etch - Clearfil SE Bond, Kuraray [CSE]; one-step self-etch - Single Bond Universal, 3M ESPE [SBU]; and two-step etch-and-rinse - Adper Single Bond 2, 3M ESPE [SB2]), electric current direction (without electric current - control, direct and reverse electric currents - 35µA), and storage time (24h - immediate and 6 months). Resin composite blocks (Filtek Z350XT, 3M ESPE) were bonded to dentin. The teeth/resin composites specimens were stored in distilled water at 37ºC for 24 hours and 6 months for the microtensile bond strength (µTBS) test (n = 10; ~12 sticks for each tooth). Failure patterns were analyzed on a stereomicroscope and classified as cohesive-dentin, cohesive-resin, adhesive or mixed. Adhesive penetration into dentin and hybrid layer formation were evaluated in a scanning electron microscope (n = 6). Data were submitted to a three-way ANOVA followed by Tukey’s post hoc test (α = 0.05). There are no differences in µTBS when the adhesive systems were applied under direct and reverse electric currents, but both electric currents increased the µTBS for all adhesive systems. SBU showed the lowest µTBS values for control groups in both storage times and direct electric current in 6 months of storage. The adhesive failure pattern was more frequently observed in all groups. The electric current formed long resin tags for all adhesive systems. Storage for 6 months did not significantly decrease µTBS values. Both directions of electric current (positive and negative charges) at 35µA can increase the µTBS of the adhesive systems tested to dentin.
DOI: 10.6084/m9.figshare.21431440
title: Spatio-temporal dynamics of surface water quality of two large reservoirs of Brazilian hydroelectric plants

description: ABSTRACT The use of water resources for energy generation, generally, involves the design of artificial dams and reservoirs. The construction of reservoirs may be associated with socio-environmental impacts. The use of statistical techniques and indexes to assess surface water quality data has been an efficient tool for understanding the spatial dynamics of these environments. The work aimed to evaluate the water quality in two large reservoirs and their main tributaries, the Emborcação and Nova Ponte hydroelectric power plants in Minas Gerais. Secondary data were evaluated using the Multivariate Statistical Technique of Cluster Analysis (CA), followed by non-parametric tests, also the Environment Water Quality Index (WQI) and the Trophic State Index (TSI). To support the discussion of the results, the types of land use and occupation in the study area were also analyzed. The results of the CA indicated the separation of the monitoring sites of each reservoir into groups, according to their locations and the type of environment in which they are inserted. The results of the statistical tests suggested a better water quality in the groups formed by stations located in the reservoir and close to it, which have been confirmed by WQI. The results of the WQI indicated the adequacy of the quality of these waters, in relation to the proposed uses for class 2 framing. About the TSI, there was the presence of intermediate primary productivity at acceptable levels. The predominance of land use for agriculture can partially justify the degradation conditions of the water quality watercourses’, especially about the parameters associated with solids and nutrients.
DOI: 10.6084/m9.figshare.21431440.v1
title: Spatio-temporal dynamics of surface water quality of two large reservoirs of Brazilian hydroelectric plants

description: ABSTRACT The use of water resources for energy generation, generally, involves the design of artificial dams and reservoirs. The construction of reservoirs may be associated with socio-environmental impacts. The use of statistical techniques and indexes to assess surface water quality data has been an efficient tool for understanding the spatial dynamics of these environments. The work aimed to evaluate the water quality in two large reservoirs and their main tributaries, the Emborcação and Nova Ponte hydroelectric power plants in Minas Gerais. Secondary data were evaluated using the Multivariate Statistical Technique of Cluster Analysis (CA), followed by non-parametric tests, also the Environment Water Quality Index (WQI) and the Trophic State Index (TSI). To support the discussion of the results, the types of land use and occupation in the study area were also analyzed. The results of the CA indicated the separation of the monitoring sites of each reservoir into groups, according to their locations and the type of environment in which they are inserted. The results of the statistical tests suggested a better water quality in the groups formed by stations located in the reservoir and close to it, which have been confirmed by WQI. The results of the WQI indicated the adequacy of the quality of these waters, in relation to the proposed uses for class 2 framing. About the TSI, there was the presence of intermediate primary productivity at acceptable levels. The predominance of land use for agriculture can partially justify the degradation conditions of the water quality watercourses’, especially about the parameters associated with solids and nutrients.
DOI: 10.6084/m9.figshare.21679292
title: Rooting of mini-cuttings and quality of plantlets of Cordia trichotoma

description: Abstract The objective of this work was to evaluate the effects of indolebutyric acid (IBA) concentration, substrate composition and volume, and propagule type on the adventitious rooting and quality of Cordia trichotoma plantlets produced by mini-cuttings. Mini-cuttings were evaluated for rooting percentage and root number and length at 30 and 60 days of cultivation. Plantlets were evaluated for shoot height and stem diameter at 30, 60, 90, and 120 days of cultivation. The Dickson quality index, number of leaves, and fresh and dry weights of shoots and roots were also determined at 120 days of cultivation. The experiments were carried out in a completely randomized design, with six replicates, in a greenhouse, evaluating different concentrations of IBA, substrate composition and volume, and propagule type for adventitious rooting. Plantlets of C. trichotoma can be produced with quality and proper rooting from mini-cuttings with one or two buds or multiple buds (apical) when treated with 3,000 mg L-1 IBA and planted in 110 cm3 tubes containing equal proportions of substrate and vermiculite.
DOI: 10.6084/m9.figshare.21679292.v1
title: Rooting of mini-cuttings and quality of plantlets of Cordia trichotoma

description: Abstract The objective of this work was to evaluate the effects of indolebutyric acid (IBA) concentration, substrate composition and volume, and propagule type on the adventitious rooting and quality of Cordia trichotoma plantlets produced by mini-cuttings. Mini-cuttings were evaluated for rooting percentage and root number and length at 30 and 60 days of cultivation. Plantlets were evaluated for shoot height and stem diameter at 30, 60, 90, and 120 days of cultivation. The Dickson quality index, number of leaves, and fresh and dry weights of shoots and roots were also determined at 120 days of cultivation. The experiments were carried out in a completely randomized design, with six replicates, in a greenhouse, evaluating different concentrations of IBA, substrate composition and volume, and propagule type for adventitious rooting. Plantlets of C. trichotoma can be produced with quality and proper rooting from mini-cuttings with one or two buds or multiple buds (apical) when treated with 3,000 mg L-1 IBA and planted in 110 cm3 tubes containing equal proportions of substrate and vermiculite.
DOI: 10.6084/m9.figshare.21679295
title: PROPAGANDA, MEDIA, AND EDUCATION: THE OFFICIAL AND ADVERTISING DISCOURSE ON THE 2017 HIGH SCHOOL REFORM

description: ABSTRACT: This article brings the results of a research that analyzed the advertisements about the 2017 high school reform, making counterpoints with the reality of the Brazilian educational system and taking into account socioeconomic issues, interpretations of the text of the law, and historical perspectives of the policies for high school in Brazil. Techniques of document and content analysis were employed by using the Iramuteq software for examining texts in the light of a bibliographic matrix supported by the main axes of dialectical historical materialism. We identified two axes in the advertisements: the defense that Law no. 13.415/17 brings vigor and an air of renewal and novelty to high school on the one hand, and, on the other, the exaltation of a supposed freedom of choice by students for the curricular trajectory according to their ambitions, desires, and personal goals for the future, which would increase their satisfaction with the school experience. Nonetheless, we argue that the official and advertising discourse on Law no. 13.415/17 presents fallacious content that distorts and manipulates the content of the legal text and that the main objective of the advertisements is to guarantee the conditions for implementing an educational reform that suits those interested in maintaining the social status quo, in which an elite dominates and directs society, controlling production and big capital, relegating the rest of society to an adverse socioeconomic reality in which not even education is guaranteed for all in an equal manner.
DOI: 10.6084/m9.figshare.21679295.v1
title: PROPAGANDA, MEDIA, AND EDUCATION: THE OFFICIAL AND ADVERTISING DISCOURSE ON THE 2017 HIGH SCHOOL REFORM

description: ABSTRACT: This article brings the results of a research that analyzed the advertisements about the 2017 high school reform, making counterpoints with the reality of the Brazilian educational system and taking into account socioeconomic issues, interpretations of the text of the law, and historical perspectives of the policies for high school in Brazil. Techniques of document and content analysis were employed by using the Iramuteq software for examining texts in the light of a bibliographic matrix supported by the main axes of dialectical historical materialism. We identified two axes in the advertisements: the defense that Law no. 13.415/17 brings vigor and an air of renewal and novelty to high school on the one hand, and, on the other, the exaltation of a supposed freedom of choice by students for the curricular trajectory according to their ambitions, desires, and personal goals for the future, which would increase their satisfaction with the school experience. Nonetheless, we argue that the official and advertising discourse on Law no. 13.415/17 presents fallacious content that distorts and manipulates the content of the legal text and that the main objective of the advertisements is to guarantee the conditions for implementing an educational reform that suits those interested in maintaining the social status quo, in which an elite dominates and directs society, controlling production and big capital, relegating the rest of society to an adverse socioeconomic reality in which not even education is guaranteed for all in an equal manner.
DOI: 10.6084/m9.figshare.21679298
title: Disaster management in Brazil: innovation through the gender perspective

description: Abstract Climate change and uneven urbanization processes have intensified the occurrence and magnitude of disasters. The purpose of this article is to discuss the integration between the National Policy for Protection and Civil Defense and the empowerment of women and communities in Brazil, revealing the innovative potential of gender-sensitive disaster management policy. For that, we base ourselves on a theoretical-conceptual survey to explain the special vulnerability of social minorities to disasters. We present the disaster management policies practiced in Brazil, which are essentially technicist, and propose the adoption of epistemologies of the South as a counterpoint. We end the article with propositions that have the potential for creating effective responses to the challenges posed by the climate emergency.
DOI: 10.6084/m9.figshare.21679298.v1
title: Disaster management in Brazil: innovation through the gender perspective

description: Abstract Climate change and uneven urbanization processes have intensified the occurrence and magnitude of disasters. The purpose of this article is to discuss the integration between the National Policy for Protection and Civil Defense and the empowerment of women and communities in Brazil, revealing the innovative potential of gender-sensitive disaster management policy. For that, we base ourselves on a theoretical-conceptual survey to explain the special vulnerability of social minorities to disasters. We present the disaster management policies practiced in Brazil, which are essentially technicist, and propose the adoption of epistemologies of the South as a counterpoint. We end the article with propositions that have the potential for creating effective responses to the challenges posed by the climate emergency.
DOI: 10.6084/m9.figshare.21679301
title: When only China wants to play: Institutional turmoil and Chinese investment in Brazil

description: Abstract The political and institutional crisis in Brazil from 2015, fueled largely by corruption probes and lawfare, had severe repercussions within the Brazilian construction and energy sectors. While many international investors withdrew from Brazil in this period, Chinese investment surged. This article accounts for the particular characteristics of Chinese investments, such as sectorial complementarities, risk assessment, market size attraction, and state-drivenness, which may explain this development.
DOI: 10.6084/m9.figshare.21679301.v1
title: When only China wants to play: Institutional turmoil and Chinese investment in Brazil

description: Abstract The political and institutional crisis in Brazil from 2015, fueled largely by corruption probes and lawfare, had severe repercussions within the Brazilian construction and energy sectors. While many international investors withdrew from Brazil in this period, Chinese investment surged. This article accounts for the particular characteristics of Chinese investments, such as sectorial complementarities, risk assessment, market size attraction, and state-drivenness, which may explain this development.
DOI: 10.6084/m9.figshare.21679303
title: Implants with hydrophilic surfaces equalize the osseointegration of implants in normo- and hyperglycaemic rats

description: Abstract The purpose of this study was to evaluate the effect of a surface modified by blasting and acid attack and maintained in an isotonic solution compared to a machined surface on osseointegration in normo- and hyperglycaemic animals. Sixty-four animals were allocated into 4 groups with 16 animals each, and they were subdivided into two experimental periods (15 and 45 days), with 8 animals in each group. The groups were divided according to the type of implant that was installed in the animals' tibia and the animals’ systemic condition: CM - Machined implants placed in Healthy animals; CH - Hydrophilic implants placed in Healthy animals, HM - Machined implants placed in animals with hyperglycaemia; HH- Hydrophilic implants installed in animals with hyperglycaemia. The following analyses were performed: biomechanical (removal torque), microtomographic (evaluation of the bone volume around the implants- BV/TV), and histomorphometric (evaluation of bone-implant contact BIC% and of the bone formation area between the threads BBT%). It was found that the implants with hydrophilic surfaces presented higher removal torques and quantities of BV/TV% and higher BIC% and BBT% values in normo- and hyperglycaemic animals. The results of this study indicated that the hydrophilic surface accelerates the osseointegration process (~ 15% BIC/BBT at 15-day period), especially in animals with hyperglycaemia. The hydrophilic surface equaled the osseointegration between normo- and hyperglycaemic animals, reversing the negative potential of hyperglycaemia on the osseointegration process.
DOI: 10.6084/m9.figshare.21679303.v1
title: Implants with hydrophilic surfaces equalize the osseointegration of implants in normo- and hyperglycaemic rats

description: Abstract The purpose of this study was to evaluate the effect of a surface modified by blasting and acid attack and maintained in an isotonic solution compared to a machined surface on osseointegration in normo- and hyperglycaemic animals. Sixty-four animals were allocated into 4 groups with 16 animals each, and they were subdivided into two experimental periods (15 and 45 days), with 8 animals in each group. The groups were divided according to the type of implant that was installed in the animals' tibia and the animals’ systemic condition: CM - Machined implants placed in Healthy animals; CH - Hydrophilic implants placed in Healthy animals, HM - Machined implants placed in animals with hyperglycaemia; HH- Hydrophilic implants installed in animals with hyperglycaemia. The following analyses were performed: biomechanical (removal torque), microtomographic (evaluation of the bone volume around the implants- BV/TV), and histomorphometric (evaluation of bone-implant contact BIC% and of the bone formation area between the threads BBT%). It was found that the implants with hydrophilic surfaces presented higher removal torques and quantities of BV/TV% and higher BIC% and BBT% values in normo- and hyperglycaemic animals. The results of this study indicated that the hydrophilic surface accelerates the osseointegration process (~ 15% BIC/BBT at 15-day period), especially in animals with hyperglycaemia. The hydrophilic surface equaled the osseointegration between normo- and hyperglycaemic animals, reversing the negative potential of hyperglycaemia on the osseointegration process.
DOI: 10.6084/m9.figshare.21679304.v1
title: First record of Psocodea (Psocoptera) on coffee (Coffea canephora) in the Brazilian Amazon (Rondônia state)

description: ABSTRACT There is much information regarding the association of Psocoptera and coffee as stored grain pests and little is known about their presence in coffee plants. We conducted a survey in a coffee plantation of Coffea canephora in the municipality of Candeias do Jamari, Rondônia state, Brazil, where we obtained the first record of a coffee plant as a host of Psocoptera in the Brazilian Amazon region, and the first record of a representative of the family Archipsocidae (Archipsocus lenkoi) for the state of Rondônia. The psocid population was concentrated and not evenly distributed over the survey area, which indicates an irregular distribution pattern. We have not detected damage or injury to the coffee plants and therefore we cannot consider these psocids as a pest in the coffee plantation.
DOI: 10.6084/m9.figshare.21679304
title: First record of Psocodea (Psocoptera) on coffee (Coffea canephora) in the Brazilian Amazon (Rondônia state)

description: ABSTRACT There is much information regarding the association of Psocoptera and coffee as stored grain pests and little is known about their presence in coffee plants. We conducted a survey in a coffee plantation of Coffea canephora in the municipality of Candeias do Jamari, Rondônia state, Brazil, where we obtained the first record of a coffee plant as a host of Psocoptera in the Brazilian Amazon region, and the first record of a representative of the family Archipsocidae (Archipsocus lenkoi) for the state of Rondônia. The psocid population was concentrated and not evenly distributed over the survey area, which indicates an irregular distribution pattern. We have not detected damage or injury to the coffee plants and therefore we cannot consider these psocids as a pest in the coffee plantation.
DOI: 10.6084/m9.figshare.21431365
title: Study of the sewage from a municipality in southern Minas Gerais, Brazil: correlation of physical and chemical variables, COVID-19 cases, and SARS-CoV-2 RNA concentration

description: ABSTRACT Wastewater-based epidemiology is an important public health tool with great applicability when facing the COVID-19 pandemic, since infected individuals are able to excrete SARS-CoV-2 particles. In this context, this study aimed to correlate the number of cases of COVID-19 with physical and chemical variables and the presence of the virus in raw sewage samples from a sewage treatment plant (STP) in the municipality of Lavras, Minas Gerais, Brazil, collected between the 19th and 25th epidemiological weeks. The samples were concentrated by electronegative membrane adsorption method and SARS-CoV-2 RNA was extracted, detected, and quantified by RT-qPCR using oligonucleotides and probes for the N gene. Moreover, the variables pH, total suspended solids, and chemical oxygen demand were evaluated. COVID-19 cases were obtained from epidemiological bulletins made available by the municipal government. From the 24th epidemiological week on, a reduction in viral concentration (copies L-1) was observed concomitantly with the pandemic response countermeasures initiated by the municipality. A strong and significant positive correlation (p&lt;0.05) between viral load and number of confirmed cases was obtained through Spearman’s test. However, there was no correlation between the presence of the virus and the physical and chemical characteristics of the sewage. Therefore, it is suggested that further research be carried out in order to track SARS-CoV-2 concentrations in wastewater, thus corroborating with the fight against the pandemic and the achievement of epidemiological surveillance systems based on sewage monitoring.
DOI: 10.6084/m9.figshare.21431365.v1
title: Study of the sewage from a municipality in southern Minas Gerais, Brazil: correlation of physical and chemical variables, COVID-19 cases, and SARS-CoV-2 RNA concentration

description: ABSTRACT Wastewater-based epidemiology is an important public health tool with great applicability when facing the COVID-19 pandemic, since infected individuals are able to excrete SARS-CoV-2 particles. In this context, this study aimed to correlate the number of cases of COVID-19 with physical and chemical variables and the presence of the virus in raw sewage samples from a sewage treatment plant (STP) in the municipality of Lavras, Minas Gerais, Brazil, collected between the 19th and 25th epidemiological weeks. The samples were concentrated by electronegative membrane adsorption method and SARS-CoV-2 RNA was extracted, detected, and quantified by RT-qPCR using oligonucleotides and probes for the N gene. Moreover, the variables pH, total suspended solids, and chemical oxygen demand were evaluated. COVID-19 cases were obtained from epidemiological bulletins made available by the municipal government. From the 24th epidemiological week on, a reduction in viral concentration (copies L-1) was observed concomitantly with the pandemic response countermeasures initiated by the municipality. A strong and significant positive correlation (p&lt;0.05) between viral load and number of confirmed cases was obtained through Spearman’s test. However, there was no correlation between the presence of the virus and the physical and chemical characteristics of the sewage. Therefore, it is suggested that further research be carried out in order to track SARS-CoV-2 concentrations in wastewater, thus corroborating with the fight against the pandemic and the achievement of epidemiological surveillance systems based on sewage monitoring.