cometadata/datacite-titles-descriptions-related-identifiers huggingface dataset:
DOI: 10.6084/m9.figshare.7244735.v1
title: Arbuscular mycorrhizal fungi associated with the babassu palm (Attalea speciosa) in the eastern periphery of Amazonia, Brazil

description: ABSTRACT Babassu, Attalea speciosa (Arecaceae) is a ruderal palm native to Amazonia, which turned dominant in frequently burned lands throughout the ‘arc of deforestation’ and other degraded lands, in extreme cases attaining complete dominance. This study investigated arbuscular mycorrhizal fungi (AMF) as one possible explanation for the outstanding ecological success of this exceptional palm. We explored the relationships between the babassu palm and native arbuscular mycorrhizal fungi and babassu effects on the AMF richness and mycorrhizal inoculum potential (MIP) in the eastern periphery of Amazonia. For this purpose, we sampled topsoil (0-20 cm) at the onset of the rainy season from a 5-year-old secondary forest regrowth (SEC) area with three levels of babassu dominance (sites with 10, 50 and 70% babassu biomass shares), and at three distances (0, 2.5 and 4 m) from isolated babassu patches within a degraded pasture (PAS), both with five replications per treatment. Glomerospore density varied from 100 to 302 per gram of soil, 56% higher in SEC than PAS. We identified a total of 16 AMF species, with dominance of Acaulospora (six species) followed by Glomus (three species). AMF richness increased with babassu dominance in SEC sites, and reduced with distance from babassu patches within the PAS. The colonization rate of babassu roots was higher in SEC than in PAS, whereas MIP was similar in both areas and without treatment differences. Our study points to strong mycorrhizal association of the babassu palm as a potential mechanism for its outstanding ecological success in degraded lands.
DOI: 10.7284/135047
title: Anemometer data collected during research cruise SKQ201908T using a Gill WindObserver 75 instrument system onboard the platform RV Sikuliaq

description: Original (unprocessed) data collected during a Field_expedition
DOI: 10.6084/m9.figshare.7244726
title: Profile of dairy cattle farmers in the Northwest of Minas Gerais and the perception about the use of artificial insemination

description: ABSTRACT This study aimed to characterize the profile of milk cattle farmers of the Northwest region of Minas Gerais State regarding the use of artificial insemination (AI) and see the most relevant factors in the perception of farmers for the adoption process of AI. From January to April 2014, 97 milk cattle farmers associated to milk cooperatives of the municipalities of northeastern Minas Gerais were interviewed. Of those interviewed farmers, 61.3% did not use artificial insemination. The majority (92.48%) of respondents were male and 48.88% were over 53 years of age, with low schooling, incomplete primary education (28.57%), or complete primary education (25.97%). Among the respondents, 66.67% had over 20 years experience in dairy farming. The average breeders by property were 99, and the average size of properties was 73 hectares (ha). In general, it was found that personal motivation is the main driver for the adoption of AI, and it is more linked to positive expectations generated by the phenotype of the animals than to economic factors. The prerequisites for adoption of AI are in the background and, among them, manpower, infrastructure, and animal handling are prominent, followed by social influence, evidenced by entities and persons involved in AI and in the daily life of farmers. Little emphasis on human resource management and use of scientific knowledge may have affected the adoption of biotechnology, resulting in low utilization. It is also possible to associate the advanced age of farmers to the resistance to the use of reproductive biotechnologies.
DOI: 10.6084/m9.figshare.7244729
title: Paroxysmal Atrial Fibrillation Catheter Ablation Outcome Depends on Pulmonary Veins Anatomy

description: Abstract Background: Pulmonary veins (PV) are often the trigger to atrial fibrillation (AF). Occasionally, left PVs converge on a common trunk (LCT) providing a simpler structure for catheter ablation. Objective: To compare the clinical characteristics and outcomes of ablation in paroxysmal atrial fibrillation (PAF) of patients with or without LCT. Methods: Case-control study of patients undergoing first-ever catheter ablation procedure for drug refractory PAF. The information was taken from patients' records by means of a digital collection instrument, and indexed to an online database (Syscardio(r)). Clinical characteristics and procedures were compared between patients with or without LCT (LCT x n-LCT), adopting a level of statistical significance of 5%. The primary endpoint associated with efficacy was lack of atrial arrhythmia over the follow-up time. Results: One hundred and seventy two patients with PAF were included in the study, 30 (17%) LCT and 142 (83%) n-LCT. The clinical characteristics, comorbidities, symptoms scale and risk scores did not differ between the groups. There was AF recurrence in 27% of PAF patients in the n-LCT group and only 10% of patients in the LCT group (OR: 3.4 p: 0.04) after a follow-up of 34 ± 17 months and 26 ± 15 months respectively. Conclusion: Patients with a LCT have a significantly lower recurrence rate when compared to patients without this structure. It is mandatory to report the results of AF catheter ablation as a PV anatomical variation function.
DOI: 10.6084/m9.figshare.7244732.v1
title: Influence of red-clay ceramic content of recycled aggregate on the properties of pervious concrete

description: ABSTRACT Construction and demolition waste can be used as recycled aggregates in different civil construction applications. The substitution of natural aggregate from pervious concrete by recycled aggregates is a sustainable alternative that ensures a final destination of these materials. However, the composition of such waste will influence directly the properties of the pervious concrete, especially with regard to the amount of ceramic material. Thus, this study analyzed the influence of recycled aggregates composition on the strength and permeability of pervious concrete. Aggregates containing 10, 25, 50 and 100% red-clay ceramic waste were obtained by mixing a construction and demolition waste (with 2,92% ceramic) and ceramic brick waste. A natural aggregate and a recycled concrete aggregate were also analyzed. The pervious concrete was characterized with regard to compressive strength, permeability coefficient, void content, water absorption and specific mass. The permeability of all pervious concretes ranged between 0,82 and 0,95 cm.s-1. The permeability coefficient decreased with the increase in the amount of ceramic in the mixture. The compressive strength of the concrete with 0% ceramic was higher than the other concretes, resulting in 10,15 MPa. The concretes containing ceramic resulted in strength below 3,00 MPa. The void content of the concretes did not vary significantly, ranging between 32,13 and 37,35%. No direct relation was observed between the void content, permeability and compressive strength. However, the strength was higher with the apparent specific mass increase and the permeability coefficient was lower in the concretes with higher water absorption.
DOI: 10.6084/m9.figshare.7244726.v1
title: Profile of dairy cattle farmers in the Northwest of Minas Gerais and the perception about the use of artificial insemination

description: ABSTRACT This study aimed to characterize the profile of milk cattle farmers of the Northwest region of Minas Gerais State regarding the use of artificial insemination (AI) and see the most relevant factors in the perception of farmers for the adoption process of AI. From January to April 2014, 97 milk cattle farmers associated to milk cooperatives of the municipalities of northeastern Minas Gerais were interviewed. Of those interviewed farmers, 61.3% did not use artificial insemination. The majority (92.48%) of respondents were male and 48.88% were over 53 years of age, with low schooling, incomplete primary education (28.57%), or complete primary education (25.97%). Among the respondents, 66.67% had over 20 years experience in dairy farming. The average breeders by property were 99, and the average size of properties was 73 hectares (ha). In general, it was found that personal motivation is the main driver for the adoption of AI, and it is more linked to positive expectations generated by the phenotype of the animals than to economic factors. The prerequisites for adoption of AI are in the background and, among them, manpower, infrastructure, and animal handling are prominent, followed by social influence, evidenced by entities and persons involved in AI and in the daily life of farmers. Little emphasis on human resource management and use of scientific knowledge may have affected the adoption of biotechnology, resulting in low utilization. It is also possible to associate the advanced age of farmers to the resistance to the use of reproductive biotechnologies.
DOI: 10.6084/m9.figshare.7244729.v1
title: Paroxysmal Atrial Fibrillation Catheter Ablation Outcome Depends on Pulmonary Veins Anatomy

description: Abstract Background: Pulmonary veins (PV) are often the trigger to atrial fibrillation (AF). Occasionally, left PVs converge on a common trunk (LCT) providing a simpler structure for catheter ablation. Objective: To compare the clinical characteristics and outcomes of ablation in paroxysmal atrial fibrillation (PAF) of patients with or without LCT. Methods: Case-control study of patients undergoing first-ever catheter ablation procedure for drug refractory PAF. The information was taken from patients' records by means of a digital collection instrument, and indexed to an online database (Syscardio(r)). Clinical characteristics and procedures were compared between patients with or without LCT (LCT x n-LCT), adopting a level of statistical significance of 5%. The primary endpoint associated with efficacy was lack of atrial arrhythmia over the follow-up time. Results: One hundred and seventy two patients with PAF were included in the study, 30 (17%) LCT and 142 (83%) n-LCT. The clinical characteristics, comorbidities, symptoms scale and risk scores did not differ between the groups. There was AF recurrence in 27% of PAF patients in the n-LCT group and only 10% of patients in the LCT group (OR: 3.4 p: 0.04) after a follow-up of 34 ± 17 months and 26 ± 15 months respectively. Conclusion: Patients with a LCT have a significantly lower recurrence rate when compared to patients without this structure. It is mandatory to report the results of AF catheter ablation as a PV anatomical variation function.
DOI: 10.7284/135048
title: Anemometer data collected during research cruise SKQ201908T using a Gill WindObserver 75 instrument system onboard the platform RV Sikuliaq

description: Processed data created by vessel technician during a Field_expedition
DOI: 10.6084/m9.figshare.7244720
title: Leachate treatment by combined processes: coagulation/flocculation, air stripping, ozonation and activated sludge

description: ABSTRACT Leachate from waste disposal areas generally presents high complexity, variability, toxicity, recalcitrance and high concentration of ammonia nitrogen. In this work, combined techniques for the treatment of leachate were applied, namely: coagulation/flocculation, air stripping and ozonation combined with activated sludge treatment with/without activated carbon. The coagulation/flocculation process led to a COD reduction of 58.1% and color removal of 85.6%. The air stripping was performed at pH&gt;12 and reduced ammonia levels below of 60 mg.L-1. The ozonation process (ozone consumption of 397 mgO3.L-1 and 2376 mgO3.L-1) presented good results. It was observed a BOD5/COD increase of 59.4% and a toxicity reduction of more than 85%. The best efficiency was observed with sludge activated without activated carbon for the pre-treated leachate by coagulation/flocculation + air stripping + ozonation (400 mgO3.L-1). This combination resulted in a COD reduction of 90.6% and more than 99% of ammonia nitrogen removal.
DOI: 10.6084/m9.figshare.7244723
title: Understanding the Formal Limit Definition: a study in preservice Mathematics’ teacher education

description: Abstract In this paper, we analyze Brazilian preservice mathematics teachers’ understanding on the formal limit definition of a function in a point, during a didactic intervention aiming at the learning of this mathematical concept with understanding. The data, collected from participant observation with audio and video recording of the classes and the written productions of these students in solving the proposed tasks, were qualitatively and interpretatively analyzed considering three elements involved in understanding: the meanings and the representations of limit and its application in problem-solving. The results showed that students, in general, assigned different meanings to the limit, which emerged from their concept-image and showed an adequate conception of the symbols present on the formal limit definition. They were also able to recognize and represent the limit, both algebraic and geometrically with records based on the symbols of this definition and to apply it correctly in the errors analysis and when solving problems involving conjecture validation. Thus, they unveiled comprehension of the formal limit definition.
DOI: 10.6084/m9.figshare.7244720.v1
title: Leachate treatment by combined processes: coagulation/flocculation, air stripping, ozonation and activated sludge

description: ABSTRACT Leachate from waste disposal areas generally presents high complexity, variability, toxicity, recalcitrance and high concentration of ammonia nitrogen. In this work, combined techniques for the treatment of leachate were applied, namely: coagulation/flocculation, air stripping and ozonation combined with activated sludge treatment with/without activated carbon. The coagulation/flocculation process led to a COD reduction of 58.1% and color removal of 85.6%. The air stripping was performed at pH&gt;12 and reduced ammonia levels below of 60 mg.L-1. The ozonation process (ozone consumption of 397 mgO3.L-1 and 2376 mgO3.L-1) presented good results. It was observed a BOD5/COD increase of 59.4% and a toxicity reduction of more than 85%. The best efficiency was observed with sludge activated without activated carbon for the pre-treated leachate by coagulation/flocculation + air stripping + ozonation (400 mgO3.L-1). This combination resulted in a COD reduction of 90.6% and more than 99% of ammonia nitrogen removal.
DOI: 10.6084/m9.figshare.7244723.v1
title: Understanding the Formal Limit Definition: a study in preservice Mathematics’ teacher education

description: Abstract In this paper, we analyze Brazilian preservice mathematics teachers’ understanding on the formal limit definition of a function in a point, during a didactic intervention aiming at the learning of this mathematical concept with understanding. The data, collected from participant observation with audio and video recording of the classes and the written productions of these students in solving the proposed tasks, were qualitatively and interpretatively analyzed considering three elements involved in understanding: the meanings and the representations of limit and its application in problem-solving. The results showed that students, in general, assigned different meanings to the limit, which emerged from their concept-image and showed an adequate conception of the symbols present on the formal limit definition. They were also able to recognize and represent the limit, both algebraic and geometrically with records based on the symbols of this definition and to apply it correctly in the errors analysis and when solving problems involving conjecture validation. Thus, they unveiled comprehension of the formal limit definition.
DOI: 10.7284/135037
title: Flowmeter data collected during research cruise SKQ201908T using a Krohne Optiflux 5000 instrument system onboard the platform RV Sikuliaq

description: Original (unprocessed) data collected during a Field_expedition
DOI: 10.6084/m9.figshare.7244717
title: Gluten-free cookies elaborated with buckwheat flour, millet flour and chia seeds

description: Abstract The aim of this study was to obtain an optimized gluten-free cookie formulation using alternative flours. For this, a 22 central composite rotatable design (CCRD), with varying concentrations of millet flour (MF) and chia seeds (CS), on a base of buckwheat flour (BF), was used. Control cookies were elaborated with 100% wheat flour (WF). The cookies were characterized for texture and other physical tests and by scanning electron microscopy of their internal structure. The response surfaces for the quality parameters of the cookies showed that the higher the proportion of MF used in the formulations, the lower the height and the greater the diameter, expansion factor, and hardness of the cookies. The addition of up to 10% CS showed no influence on the responses. The optimum point was defined as that with diameter, expansion factor, thickness, and hardness closer to the control cookie: 7.5% CS, 40% MF, and 52.5% BF. The substitution of wheat flour by buckwheat flour, millet flour, and chia seeds can be considered a suitable alternative for the preparation of gluten-free cookies.
DOI: 10.6084/m9.figshare.7244717.v1
title: Gluten-free cookies elaborated with buckwheat flour, millet flour and chia seeds

description: Abstract The aim of this study was to obtain an optimized gluten-free cookie formulation using alternative flours. For this, a 22 central composite rotatable design (CCRD), with varying concentrations of millet flour (MF) and chia seeds (CS), on a base of buckwheat flour (BF), was used. Control cookies were elaborated with 100% wheat flour (WF). The cookies were characterized for texture and other physical tests and by scanning electron microscopy of their internal structure. The response surfaces for the quality parameters of the cookies showed that the higher the proportion of MF used in the formulations, the lower the height and the greater the diameter, expansion factor, and hardness of the cookies. The addition of up to 10% CS showed no influence on the responses. The optimum point was defined as that with diameter, expansion factor, thickness, and hardness closer to the control cookie: 7.5% CS, 40% MF, and 52.5% BF. The substitution of wheat flour by buckwheat flour, millet flour, and chia seeds can be considered a suitable alternative for the preparation of gluten-free cookies.
DOI: 10.6084/m9.figshare.7244714
title: Utilization of Mesoscale Models as Initial Tool for Wind Mapping of the Paraíba State

description: Abstract The use of numerical models as a tool for evaluating wind resources has increased in recent years. In this study, an evaluation of the performance of the models BRAMS and WRF was carried out as an initial step on the investigation of wind sites in the state of Paraiba-Brazil. Simulations over a three-year period suggest that the more intense winds are located at the central regions of the state and that they tend to be higher in the spring, in comparison with the other seasons. Scenarios were also generated for March and September, that are, respectively, among the months of lowest and highest wind intensity in the state. For those scenarios the Bias ranged from -0.31 to -2.24 m/s and the MSE from 0.88 to 2.40 m/s for BRAMS. For WRF, the Bias was 0.53 to 1.81 m/s and MSE was 0.79 to 1.92 m/s. The lowest Bias and MSE were obtained for the locations analyzed in Borborema for March (BRAMS) and in the Agreste for September (WRF). Those results suggest that the models need further calibration for better simulating the local wind, especially with respect to boundary layer and surface parameterizations. In general, the results show the coherence of the models in terms of intensification/weakening of the winds according to the seasonal characteristics of the study area.
DOI: 10.7284/135038
title: Fluorometer data collected during research cruise SKQ201908T using a Turner Cyclops-7 instrument system onboard the platform RV Sikuliaq

description: Original (unprocessed) data collected during a Field_expedition
DOI: 10.6084/m9.figshare.7244705
title: Acoustic niche partitioning in an anuran community from the municipality of Floriano, Piauí, Brazil

description: Abstract Vocalizations are an important trait for the identification of cryptic and/or closely related amphibian species. Different vocalizations also contribute to partitioning of the acoustic space by sympatric species. This study aimed to describe the advertisement calls of anurans in a pond of the municipality of Floriano, State of Piauí, Brazil, and infer the acoustic niche partitioning of amphibians. Euclidean distance was used in a cluster analysis approach to infer the acoustic similarities among species. Thirteen species were analysed: Boana raniceps, Dendropsophus nanus, D. rubicundulus , D. minutus, Leptodactylus fuscus, L. troglodytes, L. vastus, Pithecopus nordestinus , Physalaemus cuvieri, P. nattereri, Pleurodema diplolister, Proceratophrys cristiceps and Scinax ruber. From these, six showed more than 90% of acoustic overlap: P. nattereri , P. cuvieri, L. fuscus and L. vastus (Leptodactylidae); and, D. nanus and D. rubicundulus (Hylidae). Despite the acoustic similarities among these six species, the acoustic interference was reduced due to the small number of sympatric species and to distinct features on carrier frequency such as dominant frequency and the degree of modulation in the frequency. Environmental factors limit the periods and sites of reproduction respectively, which may maintain the low anuran diversity and consequently reduce acoustic overlap.
DOI: 10.6084/m9.figshare.7244714.v1
title: Utilization of Mesoscale Models as Initial Tool for Wind Mapping of the Paraíba State

description: Abstract The use of numerical models as a tool for evaluating wind resources has increased in recent years. In this study, an evaluation of the performance of the models BRAMS and WRF was carried out as an initial step on the investigation of wind sites in the state of Paraiba-Brazil. Simulations over a three-year period suggest that the more intense winds are located at the central regions of the state and that they tend to be higher in the spring, in comparison with the other seasons. Scenarios were also generated for March and September, that are, respectively, among the months of lowest and highest wind intensity in the state. For those scenarios the Bias ranged from -0.31 to -2.24 m/s and the MSE from 0.88 to 2.40 m/s for BRAMS. For WRF, the Bias was 0.53 to 1.81 m/s and MSE was 0.79 to 1.92 m/s. The lowest Bias and MSE were obtained for the locations analyzed in Borborema for March (BRAMS) and in the Agreste for September (WRF). Those results suggest that the models need further calibration for better simulating the local wind, especially with respect to boundary layer and surface parameterizations. In general, the results show the coherence of the models in terms of intensification/weakening of the winds according to the seasonal characteristics of the study area.
DOI: 10.7284/135039
title: GNSS (Global Navigation Satellite System) data collected during research cruise SKQ201908T using a C&C C-Nav 3050 instrument system onboard the platform RV Sikuliaq

description: Original (unprocessed) data collected during a Field_expedition