cometadata/datacite-titles-descriptions-related-identifiers huggingface dataset:
DOI: 10.6084/m9.figshare.20278192
title: Mix design formulation range for metakaolin-based geopolymer synthesis

description: Abstract This article presents a range of mix design formulations to obtain metakaolin-based geopolymer synthesis. Geopolymer samples were synthesized from metakaolin, a 10 M sodium hydroxide solution, and alkaline sodium silicate. These three components were mixed in different proportions to form a paste which was molded in a cylindrical shape, set at room temperature for 24 hours, and demolded. The workability of the paste, the integrity of the samples, development of efflorescence, and the presence of undissolved metakaolin particles in the microstructure of the geopolymer matrix were observed. Since sodium and water play a vital role in the geopolymerization and were added at fixed proportions, a mix design was employed based on the molar proportions of aluminum, silicon, and sodium plus water. The simplex design plot was able to separate the regions of a mix of the components that showed different behaviors according to the observed responses. The dissolution of metakaolin, condensation of ortho-sialate and silicate species, which are expected to interact with each other according to the model of geopolymerization of Davidovits, can explain the observed results. “Good results” (no release of white powder, no efflorescence, no shrinkage, and no cracks) after 28 days of curing at room conditions were observed for the molar proportions 0.097 &lt; Al &lt; 0.112, 0.120 &lt; Si &lt; 0.178, and 0.711 &lt; Na+H2O &lt; 0.775 (Na/H2O = 0.185).
DOI: 10.6084/m9.figshare.20278192.v1
title: Mix design formulation range for metakaolin-based geopolymer synthesis

description: Abstract This article presents a range of mix design formulations to obtain metakaolin-based geopolymer synthesis. Geopolymer samples were synthesized from metakaolin, a 10 M sodium hydroxide solution, and alkaline sodium silicate. These three components were mixed in different proportions to form a paste which was molded in a cylindrical shape, set at room temperature for 24 hours, and demolded. The workability of the paste, the integrity of the samples, development of efflorescence, and the presence of undissolved metakaolin particles in the microstructure of the geopolymer matrix were observed. Since sodium and water play a vital role in the geopolymerization and were added at fixed proportions, a mix design was employed based on the molar proportions of aluminum, silicon, and sodium plus water. The simplex design plot was able to separate the regions of a mix of the components that showed different behaviors according to the observed responses. The dissolution of metakaolin, condensation of ortho-sialate and silicate species, which are expected to interact with each other according to the model of geopolymerization of Davidovits, can explain the observed results. “Good results” (no release of white powder, no efflorescence, no shrinkage, and no cracks) after 28 days of curing at room conditions were observed for the molar proportions 0.097 &lt; Al &lt; 0.112, 0.120 &lt; Si &lt; 0.178, and 0.711 &lt; Na+H2O &lt; 0.775 (Na/H2O = 0.185).
DOI: 10.6084/m9.figshare.20278194.v1
title: Teaching Biology by investigation: a case study in the context of education for young adults and adults

description: ABSTRACT Teaching by investigation is characterized as a practice that aims to encourage students’ protagonism, critical thinking and autonomy. The methodological approach was quantitative-qualitative, descriptive, and made use of participant observation. The data, collected through questionnaires, led to a qualitative analysis of the students, who demonstrated motivation, leadership and autonomy in the construction of knowledge. This resulted in an affirmation measured quantitatively by the significant increase in the number of students who stated, in the questionnaire, that they “understand without difficulty” the topics covered. These results pointed to a positive evaluation of the theme and methodological approach used. At the end, the students revealed, in their perceptions and attitudes, the development of meaningful learning and the potential to multiply the knowledge built, acting as transformers of their own reality.
DOI: 10.6084/m9.figshare.20278194
title: Teaching Biology by investigation: a case study in the context of education for young adults and adults

description: ABSTRACT Teaching by investigation is characterized as a practice that aims to encourage students’ protagonism, critical thinking and autonomy. The methodological approach was quantitative-qualitative, descriptive, and made use of participant observation. The data, collected through questionnaires, led to a qualitative analysis of the students, who demonstrated motivation, leadership and autonomy in the construction of knowledge. This resulted in an affirmation measured quantitatively by the significant increase in the number of students who stated, in the questionnaire, that they “understand without difficulty” the topics covered. These results pointed to a positive evaluation of the theme and methodological approach used. At the end, the students revealed, in their perceptions and attitudes, the development of meaningful learning and the potential to multiply the knowledge built, acting as transformers of their own reality.
DOI: 10.6084/m9.figshare.20278197
title: Methyl jasmonate does improve postharvest conservation of ‘Golden’ papaya fruit

description: ABSTRACT: Methyl jasmonate (MeJA) is recognized as a plant hormone that induces several biochemical changes related to improving fruit quality, but it is evident that the effect of MeJA during postharvest is very variable upon concentration, plant species, and even cultivars. The objective of this research was to relate the application of this regulator at low concentration (10 µmol L-1 for 24 h) to changes in postharvest physiology, on the incidence of anthracnose and quality of ‘Golden’ papaya fruit during storage at 24 ± 1°C. From the seventh day of storage, anthracnose incidence was reduced by more than 50% with MeJA treatment. The lesion area after infection was also reduced. Although, MeJA reduced fruit acidity, the ascorbic acid and soluble solids content were not altered during storage with the hormonal treatment. The skin color and pulp firmness showed slight retention. The reduction in ethylene production was accompanied by a reduction of respiration in treated fruits. MeJa increased CAT activity only in the skin whereas SOD activity was not induced by MeJA in both skin and pulp. Although, the increase of CAT from the third day of storage may have contributed to the reduction of lipid peroxidation in the skin, the MDA reduction in the pulp cannot be explained only by CAT activity. In summary, the application of MeJA in ‘Golden’ papaya reduced the incidence and severity of anthracnose, decreased respiration, ethylene production and lipid peroxidation. It is concluded that the application of MeJA at a low concentration (10 µmol L-1) may contribute to anthracnose control in ´Golden`papaya and slows the ripening of fruits.
DOI: 10.6084/m9.figshare.20278197.v1
title: Methyl jasmonate does improve postharvest conservation of ‘Golden’ papaya fruit

description: ABSTRACT: Methyl jasmonate (MeJA) is recognized as a plant hormone that induces several biochemical changes related to improving fruit quality, but it is evident that the effect of MeJA during postharvest is very variable upon concentration, plant species, and even cultivars. The objective of this research was to relate the application of this regulator at low concentration (10 µmol L-1 for 24 h) to changes in postharvest physiology, on the incidence of anthracnose and quality of ‘Golden’ papaya fruit during storage at 24 ± 1°C. From the seventh day of storage, anthracnose incidence was reduced by more than 50% with MeJA treatment. The lesion area after infection was also reduced. Although, MeJA reduced fruit acidity, the ascorbic acid and soluble solids content were not altered during storage with the hormonal treatment. The skin color and pulp firmness showed slight retention. The reduction in ethylene production was accompanied by a reduction of respiration in treated fruits. MeJa increased CAT activity only in the skin whereas SOD activity was not induced by MeJA in both skin and pulp. Although, the increase of CAT from the third day of storage may have contributed to the reduction of lipid peroxidation in the skin, the MDA reduction in the pulp cannot be explained only by CAT activity. In summary, the application of MeJA in ‘Golden’ papaya reduced the incidence and severity of anthracnose, decreased respiration, ethylene production and lipid peroxidation. It is concluded that the application of MeJA at a low concentration (10 µmol L-1) may contribute to anthracnose control in ´Golden`papaya and slows the ripening of fruits.
DOI: 10.6084/m9.figshare.20278200
title: The fiscal crisis: what happened recently?

description: ABSTRACT This article updates the discussion of the fiscal situation of the central government in Brazil. It is shown that, between 1988 and 1995, the National Treasury revenues increased almost 3% of the GDP. Consequently, during 1990-1995, the central government exhibited a fiscal equilibrium, a better result than the average deficit of 2.8% of GDP observed in 1985-1989. Despite these numbers, some problems of the current situation of the fiscal accounts are highlighted and the increasing weight of the wages and Social Security expenditures, (a) which together jumped from 47% to 60% of the revenues between 1988 and 1995, (b) is pointed out as the most important reason for the budget constraint of the majority of the ministries.
DOI: 10.6084/m9.figshare.20278200.v1
title: The fiscal crisis: what happened recently?

description: ABSTRACT This article updates the discussion of the fiscal situation of the central government in Brazil. It is shown that, between 1988 and 1995, the National Treasury revenues increased almost 3% of the GDP. Consequently, during 1990-1995, the central government exhibited a fiscal equilibrium, a better result than the average deficit of 2.8% of GDP observed in 1985-1989. Despite these numbers, some problems of the current situation of the fiscal accounts are highlighted and the increasing weight of the wages and Social Security expenditures, (a) which together jumped from 47% to 60% of the revenues between 1988 and 1995, (b) is pointed out as the most important reason for the budget constraint of the majority of the ministries.
DOI: 10.6084/m9.figshare.20278201
title: Obtainment of a new metal matrix composite from the recycling of UNS S31803 duplex stainless steel by powder metallurgy

description: Abstract The purpose of circular economy is to maximize resources efficiency. With the increase in consumption of raw materials, energy and waste generation, recycling is necessary for environmental and industrial reasons. Thus, the powder metallurgy, together with mechanical milling, stands as a new method for scraps recycling. This study aimed to produce UNS S31803 duplex stainless steel powders, with vanadium carbide (VC) addition as reinforcement, through mechanical milling. Different uniaxial compaction pressures (700, 800 and 900 MPa) were used, as well as sintering temperatures (1200, 1240 and 1280 °C) and times (1, 1.5 and 2 hours), in order to determine the best conditions. Particle size analysis, scanning electron microscopy and x-ray diffraction were used to characterize the powders. It was observed that the use of VC increased the comminution during the milling process, being obtained an average particle size of 42 μm. The highest density obtained was of 82% and hardness of 72%, in comparison with the steel from the manufacturing process. According to the analysis, it was verified that this method is viable, becoming an alternative route to reuse UNS S31803 duplex stainless steel scraps.
DOI: 10.6084/m9.figshare.20278201.v1
title: Obtainment of a new metal matrix composite from the recycling of UNS S31803 duplex stainless steel by powder metallurgy

description: Abstract The purpose of circular economy is to maximize resources efficiency. With the increase in consumption of raw materials, energy and waste generation, recycling is necessary for environmental and industrial reasons. Thus, the powder metallurgy, together with mechanical milling, stands as a new method for scraps recycling. This study aimed to produce UNS S31803 duplex stainless steel powders, with vanadium carbide (VC) addition as reinforcement, through mechanical milling. Different uniaxial compaction pressures (700, 800 and 900 MPa) were used, as well as sintering temperatures (1200, 1240 and 1280 °C) and times (1, 1.5 and 2 hours), in order to determine the best conditions. Particle size analysis, scanning electron microscopy and x-ray diffraction were used to characterize the powders. It was observed that the use of VC increased the comminution during the milling process, being obtained an average particle size of 42 μm. The highest density obtained was of 82% and hardness of 72%, in comparison with the steel from the manufacturing process. According to the analysis, it was verified that this method is viable, becoming an alternative route to reuse UNS S31803 duplex stainless steel scraps.
DOI: 10.6084/m9.figshare.20278203
title: INTERCULTURAL DEMOCRATIC CITIZEN TRAINING OF GIRLS IN PERUVIAN RURAL CONTEXTS

description: ABSTRACT The factors that influence the civic, democratic and intercultural training of Peruvian rural girls were identified, as well as the actors that contribute to the recognition of identities that strengthen social rights and duties through intercultural dialogue. From a qualitative exploratory design, and with the help of experts in the field, foresight techniques were used to determine the factors that are most influential and dependent. The results indicate as key factors school dropout, school day and climate, learning achieved, and learning strategies. The Peruvian Ministry of Education represented the most influential agent in the system. From these results, it is convenient to research more about the gender gap between rural children and about the construction of a specific intercultural citizenship for different contexts in Peru.
DOI: 10.6084/m9.figshare.20278203.v1
title: INTERCULTURAL DEMOCRATIC CITIZEN TRAINING OF GIRLS IN PERUVIAN RURAL CONTEXTS

description: ABSTRACT The factors that influence the civic, democratic and intercultural training of Peruvian rural girls were identified, as well as the actors that contribute to the recognition of identities that strengthen social rights and duties through intercultural dialogue. From a qualitative exploratory design, and with the help of experts in the field, foresight techniques were used to determine the factors that are most influential and dependent. The results indicate as key factors school dropout, school day and climate, learning achieved, and learning strategies. The Peruvian Ministry of Education represented the most influential agent in the system. From these results, it is convenient to research more about the gender gap between rural children and about the construction of a specific intercultural citizenship for different contexts in Peru.
DOI: 10.6084/m9.figshare.20278206
title: The federalism in Brazil: a ‘state of arts’ of theory

description: ABSTRACT The purpose of this paper is to demonstrate how important is to build up a theoretical framework to properly grasp the meaning of the federalism issue in Brazil. Firstly, we make a survey of the main theories approaching the federalism subject in order to analyze whether they fit or not in the Brazilian case. Focusing then on the recent literature about Brazilian federalism, we show how its lack of analytical perspective fails to explain the interactions between the different levels of governments occurred in the last decades. For this reason, we propose a line of research adjusted to the Brazilian federalism issue, which must take into account not only the specific political environment existing in that country, but also the rationality of the institutions and social organized groups involved in that federative settling.
DOI: 10.6084/m9.figshare.20278206.v1
title: The federalism in Brazil: a ‘state of arts’ of theory

description: ABSTRACT The purpose of this paper is to demonstrate how important is to build up a theoretical framework to properly grasp the meaning of the federalism issue in Brazil. Firstly, we make a survey of the main theories approaching the federalism subject in order to analyze whether they fit or not in the Brazilian case. Focusing then on the recent literature about Brazilian federalism, we show how its lack of analytical perspective fails to explain the interactions between the different levels of governments occurred in the last decades. For this reason, we propose a line of research adjusted to the Brazilian federalism issue, which must take into account not only the specific political environment existing in that country, but also the rationality of the institutions and social organized groups involved in that federative settling.
DOI: 10.5281/zenodo.6812997
title: DATA

description: The data of the manuscript named "<strong>Insights into the role of </strong><strong>dicarboxylic acid</strong><strong> on CCN activity: implications for surface tension effect</strong>"
DOI: 10.5281/zenodo.6812996
title: DATA

description: The data of the manuscript named "<strong>Insights into the role of </strong><strong>dicarboxylic acid</strong><strong> on CCN activity: implications for surface tension effect</strong>"
DOI: 10.6084/m9.figshare.20278207
title: In vitro and in vivo study of the pathogenic role of PPARα in experimental periodontitis

description: Abstract Objective The purpose of this study is to investigate the pathogenic role of PPARα in periodontal antigen treated gingival cells in vitro and in experimental periodontitis in vivo . Methodology Gingival fibroblasts, gingival epithelial cells and splenocytes were isolated from C57BL/6J wild type (WT) mice and treated with fixed P. gingivalis at for 48 hours. The mRNA levels of PPARs, TNFα, IL-1β and IL-10 were detected by Real-time quantitative PCR. Silk ligatures after being soaked in the P.gingivalis suspension were tied around both maxillary second molars of WT mice or PPARα knock-out (KO) mice for two weeks. PPARα agonist fenofibrate and vehicle control were injected into the different side of the palatal gingiva on days 3, 6, and 9. At day 14, bone resorption and gingival mRNA expression levels of PPARs, TNFα, IL-1β and IL-10 were measured by micro-computed tomography and RT-qPCR respectively. Results P. gingivalis treatment downregulated the expression of PPARα, but not PPARβ or PPARγ, and increased the expression of TNF-α and IL-1β in Gingival fibroblasts, gingival epithelial cells and splenocytes from WT mice. Gingival mRNA levels of PPARα were significantly decreased in experimental periodontitis in WT mice. The bone loss of PPARα KO mice in experimental periodontitis was significantly higher than WT mice and was not reduced by fenofibrate treatment. Gingival TNFα protein expressions were significantly increased by P. gingivalis associated ligation and decreased by fenofibrate treatment in WT mice but not in PPARα KO mice. Conclusion This study suggests that PPARα plays an essential role in periodontitis.
DOI: 10.6084/m9.figshare.20278207.v1
title: In vitro and in vivo study of the pathogenic role of PPARα in experimental periodontitis

description: Abstract Objective The purpose of this study is to investigate the pathogenic role of PPARα in periodontal antigen treated gingival cells in vitro and in experimental periodontitis in vivo . Methodology Gingival fibroblasts, gingival epithelial cells and splenocytes were isolated from C57BL/6J wild type (WT) mice and treated with fixed P. gingivalis at for 48 hours. The mRNA levels of PPARs, TNFα, IL-1β and IL-10 were detected by Real-time quantitative PCR. Silk ligatures after being soaked in the P.gingivalis suspension were tied around both maxillary second molars of WT mice or PPARα knock-out (KO) mice for two weeks. PPARα agonist fenofibrate and vehicle control were injected into the different side of the palatal gingiva on days 3, 6, and 9. At day 14, bone resorption and gingival mRNA expression levels of PPARs, TNFα, IL-1β and IL-10 were measured by micro-computed tomography and RT-qPCR respectively. Results P. gingivalis treatment downregulated the expression of PPARα, but not PPARβ or PPARγ, and increased the expression of TNF-α and IL-1β in Gingival fibroblasts, gingival epithelial cells and splenocytes from WT mice. Gingival mRNA levels of PPARα were significantly decreased in experimental periodontitis in WT mice. The bone loss of PPARα KO mice in experimental periodontitis was significantly higher than WT mice and was not reduced by fenofibrate treatment. Gingival TNFα protein expressions were significantly increased by P. gingivalis associated ligation and decreased by fenofibrate treatment in WT mice but not in PPARα KO mice. Conclusion This study suggests that PPARα plays an essential role in periodontitis.
DOI: 10.6084/m9.figshare.20278209
title: Magnetic resonance imaging findings in patients with polymyalgia rheumatica

description: Abstract Objective: To describe the prevalence of magnetic resonance imaging (MRI) findings in patients with the clinical diagnosis of polymyalgia rheumatica (PMR). Materials and Methods: Sixteen consecutive patients with untreated PMR, meeting the American College of Rheumatology criteria, underwent MRI examinations of the shoulder(s), hip(s), or both, depending on clinical complaints. Six patients also underwent MRI of the spine. Results: We evaluated 24 shoulders, among which we identified subacromial-subdeltoid bursitis in 21 (87.5%), glenohumeral joint effusion in 17 (70.8%), and fluid distention of the long head of the biceps tendon sheath in 15 (62.5%). Peritendinitis and capsular edema were observed in 21 (87.5%) and 17 (70.8%) shoulders, respectively. We also evaluated 17 hips, identifying hip joint effusion in 12 (70.6%), trochanteric bursitis in 11 (64.7%), peritendinitis in 17 (100%), and capsular edema in 14 (82.4%). All six of the patients who underwent MRI of the spine were found to have interspinous bursitis. Conclusion: Subacromial-subdeltoid bursitis, glenohumeral joint effusion, and hip joint effusion are common findings in patients with PMR. In addition, such patients appear to be highly susceptible to peritendinitis and capsular edema. There is a need for case-control studies to validate our data and to determine the real impact that these findings have on the diagnosis of PMR by MRI.