cometadata/datacite-titles-descriptions-related-identifiers huggingface dataset:
DOI: 10.6084/m9.figshare.20363083
title: Phosphate sources affect P and N nutrition in pluri-specific natural grasslands in the Brazilian Pampa biome

description: ABSTRACT High acidity and low soil P availability in the soils from the Pampa natural grasslands generally limit the forage growth and economic return. Thus, to increase the economic return and avoid environmental degradation and biodiversity loss due to replacement by intensive cropping systems, it is essential to improve the soil P availability. This study aimed to diagnose the nutritional status of the pluri-specific natural grasslands amended with different history of P sources. Additionally, we also try to indicate the most appropriate range of soil P availability for maximizing forage growth. The experiment started in 1997 in an area of Pampa natural grasslands in the state of Rio Grande do Sul, Brazil. The treatments evaluated the application of Gafsa hyperphosphate (HP) and triple superphosphate (SP) for four years (1997, 1998, 2002, and 2010). Soil and aboveground biomass sampling were performed five times from October 2010 to March 2011 to access aboveground biomass production, botanical composition, soil available P, and N and P nutrition index. Greater P availability in the soil amended with SP produced more forage and resulted in a higher P accumulation than in the soil amended with HP. The ideal range of soil P availability in the soils of natural grasslands ranged from 14 to 20 mg kg˗1, varying for different plant species. The species Paspalum plicatulum and Aristida laevis produce less aboveground biomass and accumulate less P in their tissue than Dichantelium sabulorum and Eustachys uliginosa, and P. notatum. Therefore, areas of natural grasslands dominated by D. sabulorum, E. uliginosa and P. notatum demand higher soil P availability to maintain high forage production. Soil P fertilization of pluri-specific natural grasslands in the Brazilian Pampa biome must consider the dominant forage species in the area and the soil P availability.
DOI: 10.6084/m9.figshare.20363083.v1
title: Phosphate sources affect P and N nutrition in pluri-specific natural grasslands in the Brazilian Pampa biome

description: ABSTRACT High acidity and low soil P availability in the soils from the Pampa natural grasslands generally limit the forage growth and economic return. Thus, to increase the economic return and avoid environmental degradation and biodiversity loss due to replacement by intensive cropping systems, it is essential to improve the soil P availability. This study aimed to diagnose the nutritional status of the pluri-specific natural grasslands amended with different history of P sources. Additionally, we also try to indicate the most appropriate range of soil P availability for maximizing forage growth. The experiment started in 1997 in an area of Pampa natural grasslands in the state of Rio Grande do Sul, Brazil. The treatments evaluated the application of Gafsa hyperphosphate (HP) and triple superphosphate (SP) for four years (1997, 1998, 2002, and 2010). Soil and aboveground biomass sampling were performed five times from October 2010 to March 2011 to access aboveground biomass production, botanical composition, soil available P, and N and P nutrition index. Greater P availability in the soil amended with SP produced more forage and resulted in a higher P accumulation than in the soil amended with HP. The ideal range of soil P availability in the soils of natural grasslands ranged from 14 to 20 mg kg˗1, varying for different plant species. The species Paspalum plicatulum and Aristida laevis produce less aboveground biomass and accumulate less P in their tissue than Dichantelium sabulorum and Eustachys uliginosa, and P. notatum. Therefore, areas of natural grasslands dominated by D. sabulorum, E. uliginosa and P. notatum demand higher soil P availability to maintain high forage production. Soil P fertilization of pluri-specific natural grasslands in the Brazilian Pampa biome must consider the dominant forage species in the area and the soil P availability.
DOI: 10.6084/m9.figshare.20363084
title: SYNTHESIS, CHARACTERIZATION, AND APPLICATION OF Ca-MOFs IN THE REMOVAL OF METHYLENE BLUE VIA ADSORPTION

description: Metal-organic frameworks (MOFs) based on Calcium-terephthalate(Ca-MOFs) were synthesized by the sonochemical method and applied to remove methylene blue (MB) from an aqueous solution via adsorption. The samples were prepared and characterized by X-ray Powder Diffraction (PXRD), Attenuated Total Reflectance Fourier Transform Infrared Spectroscopy (ATR-FTIR), Thermal Analysis (TGA-DTA), and Scanning Electron Microscopy (SEM). The studied of the effect of the synthesis temperature on the crystallization of MOFs indicated two different crystal structures were identified, Ca(BDC) and Ca(BDC)(H2O)3. Observed that samples with a higher proportion of the Ca(BDC) phase showed greater dye adsorption capacity. The experimental data fit the pseudo-second-order kinetic model. The Langmuir and Freundlich adsorption models were applied to describe the equilibrium isotherms, and the isotherm constants were also determined. The adsorption equilibrium data preferably fit the Freundlich model. The samples were applied to methylene blue adsorption at pH 5.6, with maximum adsorption of 60.241 μmol.g-1 and high reuse efficiency, reaching 97% of the initial adsorption capacity in the second reuse cycle.
DOI: 10.6084/m9.figshare.20363084.v1
title: SYNTHESIS, CHARACTERIZATION, AND APPLICATION OF Ca-MOFs IN THE REMOVAL OF METHYLENE BLUE VIA ADSORPTION

description: Metal-organic frameworks (MOFs) based on Calcium-terephthalate(Ca-MOFs) were synthesized by the sonochemical method and applied to remove methylene blue (MB) from an aqueous solution via adsorption. The samples were prepared and characterized by X-ray Powder Diffraction (PXRD), Attenuated Total Reflectance Fourier Transform Infrared Spectroscopy (ATR-FTIR), Thermal Analysis (TGA-DTA), and Scanning Electron Microscopy (SEM). The studied of the effect of the synthesis temperature on the crystallization of MOFs indicated two different crystal structures were identified, Ca(BDC) and Ca(BDC)(H2O)3. Observed that samples with a higher proportion of the Ca(BDC) phase showed greater dye adsorption capacity. The experimental data fit the pseudo-second-order kinetic model. The Langmuir and Freundlich adsorption models were applied to describe the equilibrium isotherms, and the isotherm constants were also determined. The adsorption equilibrium data preferably fit the Freundlich model. The samples were applied to methylene blue adsorption at pH 5.6, with maximum adsorption of 60.241 μmol.g-1 and high reuse efficiency, reaching 97% of the initial adsorption capacity in the second reuse cycle.
DOI: 10.6084/m9.figshare.20363087
title: Growth dynamics of container seedlings of Eucalyptus grandis x Eucalyptus urophylla and Hymenaea courbaril L.

description: ABSTRACT Growth analysis (GA) is used to quantify plant development based on morphophysiological changes. GA is a practical tool to evaluate nursery techniques to make them more efficient. The objective of this essay was to quantity measure morphophysiological growth variables of Eucalyptus grandis x Eucalyptus urophylla and Hymenaea courbaril (jatoba) container seedlings to characterize growth stages. The essay was conducted in a shade house located in the western state of Paraná. GA analyses were performed at 10-day intervals on seedlings of both species. When evaluating Hymenaea courbaril seedlings results indicated increased values of height, diameter, root and shoot dry biomass up to 130 days after emergence (DAE). Seedling growth stage-based GA were 70, 100 and 130 DAE for the Eucalyptus hybrid and 50, 80, and 110 DAE for jatoba which presented accelerated, intermediate and reduced seedling growth.
DOI: 10.6084/m9.figshare.20363087.v1
title: Growth dynamics of container seedlings of Eucalyptus grandis x Eucalyptus urophylla and Hymenaea courbaril L.

description: ABSTRACT Growth analysis (GA) is used to quantify plant development based on morphophysiological changes. GA is a practical tool to evaluate nursery techniques to make them more efficient. The objective of this essay was to quantity measure morphophysiological growth variables of Eucalyptus grandis x Eucalyptus urophylla and Hymenaea courbaril (jatoba) container seedlings to characterize growth stages. The essay was conducted in a shade house located in the western state of Paraná. GA analyses were performed at 10-day intervals on seedlings of both species. When evaluating Hymenaea courbaril seedlings results indicated increased values of height, diameter, root and shoot dry biomass up to 130 days after emergence (DAE). Seedling growth stage-based GA were 70, 100 and 130 DAE for the Eucalyptus hybrid and 50, 80, and 110 DAE for jatoba which presented accelerated, intermediate and reduced seedling growth.
DOI: 10.6084/m9.figshare.20363089
title: APPLICATION OF POLYMERS IN THE FLOCCULATION OF KAOLIN WASTE: EFFECTS OF VARYING CONCENTRATION AND TYPE OF FLOCCULANT

description: This study assessed the effects of volume concentration (0.3%, 0.6%, 1.2%, and 12% v/v) and type of polymer flocculant (acrylamide, chitosan, and purified and non-purified acrylamide grafted chitosan) on the flocculation mechanism of kaolinite-rich mining tailings samples. We measured the flocculated samples’ transmittance using UV-VIS spectrometry to check for particles in the supernatant medium in order to verify the flocculation efficiency. It was observed that flocculation directly depends on the pH of the medium, the isoelectric point of the kaolinite, and the polymer chains’ molecular mass. The concentration of H+ and OH- ions is responsible for producing charges of different electrical nature on the particles present in the suspension, thereby affecting the flocculation process. In the acrylamide samples, the aggregation of particles occurs by electrostatic interaction; and in the other samples by bridging, suggesting that the chains’ molecular mass interferes in the coagulation and flocculation mechanisms. Moreover, the results of absorbance measurements and flocs’ apparent density highlight that the grafting of acrylamide on the chitosan chain may improve the kaolin waste flocculation. For flocculant concentrations of up to 1.2% (v/v), the absorbances were mostly below 1.0, indicating removal of suspended materials.
DOI: 10.6084/m9.figshare.20363089.v1
title: APPLICATION OF POLYMERS IN THE FLOCCULATION OF KAOLIN WASTE: EFFECTS OF VARYING CONCENTRATION AND TYPE OF FLOCCULANT

description: This study assessed the effects of volume concentration (0.3%, 0.6%, 1.2%, and 12% v/v) and type of polymer flocculant (acrylamide, chitosan, and purified and non-purified acrylamide grafted chitosan) on the flocculation mechanism of kaolinite-rich mining tailings samples. We measured the flocculated samples’ transmittance using UV-VIS spectrometry to check for particles in the supernatant medium in order to verify the flocculation efficiency. It was observed that flocculation directly depends on the pH of the medium, the isoelectric point of the kaolinite, and the polymer chains’ molecular mass. The concentration of H+ and OH- ions is responsible for producing charges of different electrical nature on the particles present in the suspension, thereby affecting the flocculation process. In the acrylamide samples, the aggregation of particles occurs by electrostatic interaction; and in the other samples by bridging, suggesting that the chains’ molecular mass interferes in the coagulation and flocculation mechanisms. Moreover, the results of absorbance measurements and flocs’ apparent density highlight that the grafting of acrylamide on the chitosan chain may improve the kaolin waste flocculation. For flocculant concentrations of up to 1.2% (v/v), the absorbances were mostly below 1.0, indicating removal of suspended materials.
DOI: 10.6084/m9.figshare.20363090
title: Water footprint of Arabica coffee from “Matas de Minas” under shade management

description: ABSTRACT Studies related to climate change and agricultural value chains have in common the growing concern on conserving water resources. Thus, the concept of the water footprint stands out, which measures the amount of water (in volume) necessary to produce a unit (in mass) of a given product. Among Brazilian agricultural activities, coffee farming emerges as one of the most important, even though the crop is sensitive to potential climatic changes, especially to the increase in temperature and periods of drought. An alternative to mitigate the effects of climate change is shade management, which is common in agroforestry systems. Therefore, the objective of this study was to evaluate the influence of shade management on the water footprint of coffee activity in the region of “Matas de Minas”. The water footprint was calculated for the field and product processing phase. Despite reducing the evapotranspiration of the coffee plant, shade management provided an increase in the water footprint, since it decreased the crop yield. The water footprint data obtained are expressive, with a calculated value of 13,862 m3 t-1 for full sun management and 16,895 m3 t-1 for shade management, in which both are the most recommended for the agricultural sector.
DOI: 10.6084/m9.figshare.20363090.v1
title: Water footprint of Arabica coffee from “Matas de Minas” under shade management

description: ABSTRACT Studies related to climate change and agricultural value chains have in common the growing concern on conserving water resources. Thus, the concept of the water footprint stands out, which measures the amount of water (in volume) necessary to produce a unit (in mass) of a given product. Among Brazilian agricultural activities, coffee farming emerges as one of the most important, even though the crop is sensitive to potential climatic changes, especially to the increase in temperature and periods of drought. An alternative to mitigate the effects of climate change is shade management, which is common in agroforestry systems. Therefore, the objective of this study was to evaluate the influence of shade management on the water footprint of coffee activity in the region of “Matas de Minas”. The water footprint was calculated for the field and product processing phase. Despite reducing the evapotranspiration of the coffee plant, shade management provided an increase in the water footprint, since it decreased the crop yield. The water footprint data obtained are expressive, with a calculated value of 13,862 m3 t-1 for full sun management and 16,895 m3 t-1 for shade management, in which both are the most recommended for the agricultural sector.
DOI: 10.6084/m9.figshare.20363095
title: REDGIM AS A SMARTPHONE APP FOR CHEMOMETRICS APPLICATIONS THROUGH IMAGE ANALYSIS: A USE IN PLS

description: The study of the spectrum of light has increased its range of action in the field of chemistry, with the help of several advanced equipment and innovative techniques that have become a strong ally of analytical chemistry. However, the simplicity of obtaining results integrated with mobile devices appears as an interesting path to be taken in the field of chemical analysis. This work addresses the dissemination of an application called REDGIM for smartphones on the Android platform capable of working with multivariate image analysis using chemometric methods through the luminous intensities of photos and R (red), G (green) and B (blue) channels. In order to show the potential of REDGIM, we propose two applications using the partial least squares (PLS) regression method: 1) quantification of free chlorine in tap water; and 2) quantification of cannabinol, (CBN, a type of cannabinoid) in marijuana and hashish samples. The free chlorine concentration obtained for two investigated samples was 0.73 and 0.74 mg L-1 and 0.74 and 0.76 mg L-1 by the spectrophotometer and by the application (container: cuvette), respectively. For the quantification of CBN in marijuana and hashish samples, the mean concentration ranged from 6.137 to 8.823 mg mL-1. The results obtained by the application are compatible with results from traditional techniques, such as UV-Vis spectrophotometry, for example. Therefore, REDGIM was proved to be a simple and accessible technological tool for the scientific community, being viable for chemical tests of a multivariate nature.
DOI: 10.6084/m9.figshare.20363095.v1
title: REDGIM AS A SMARTPHONE APP FOR CHEMOMETRICS APPLICATIONS THROUGH IMAGE ANALYSIS: A USE IN PLS

description: The study of the spectrum of light has increased its range of action in the field of chemistry, with the help of several advanced equipment and innovative techniques that have become a strong ally of analytical chemistry. However, the simplicity of obtaining results integrated with mobile devices appears as an interesting path to be taken in the field of chemical analysis. This work addresses the dissemination of an application called REDGIM for smartphones on the Android platform capable of working with multivariate image analysis using chemometric methods through the luminous intensities of photos and R (red), G (green) and B (blue) channels. In order to show the potential of REDGIM, we propose two applications using the partial least squares (PLS) regression method: 1) quantification of free chlorine in tap water; and 2) quantification of cannabinol, (CBN, a type of cannabinoid) in marijuana and hashish samples. The free chlorine concentration obtained for two investigated samples was 0.73 and 0.74 mg L-1 and 0.74 and 0.76 mg L-1 by the spectrophotometer and by the application (container: cuvette), respectively. For the quantification of CBN in marijuana and hashish samples, the mean concentration ranged from 6.137 to 8.823 mg mL-1. The results obtained by the application are compatible with results from traditional techniques, such as UV-Vis spectrophotometry, for example. Therefore, REDGIM was proved to be a simple and accessible technological tool for the scientific community, being viable for chemical tests of a multivariate nature.
DOI: 10.6084/m9.figshare.20363099
title: Educational technology to promote father involvement in childbirth and birth

description: ABSTRACT Objectives: to build and validate an educational booklet to promote the involvement of parents in labor and birth. Methods: methodological study developed in five stages: situational diagnosis; bibliographic survey; construction of illustrations, layout, design and texts; content and appearance validation by judges (25 experts) and calculation of the Flesch Readability Index; and validation with the target audience (12 parents). A minimum Content Validity Index of 0.80 was considered. Results: the booklet was entitled “Father Presence” and was developed in 11 topics. In Content and Appearance Validation, the Validity Index obtained an overall score of 0.97. Cronbach’s alpha was 0.92, indicating excellent reliability of its content. A global score of 74% for readability was obtained, considered easy to understand. Conclusions: the material was successful in the validation process, and it can be recommended for parents to use it during the prenatal period, promoting the inclusion of the partner and preparing them for labor and birth.
DOI: 10.6084/m9.figshare.20363099.v1
title: Educational technology to promote father involvement in childbirth and birth

description: ABSTRACT Objectives: to build and validate an educational booklet to promote the involvement of parents in labor and birth. Methods: methodological study developed in five stages: situational diagnosis; bibliographic survey; construction of illustrations, layout, design and texts; content and appearance validation by judges (25 experts) and calculation of the Flesch Readability Index; and validation with the target audience (12 parents). A minimum Content Validity Index of 0.80 was considered. Results: the booklet was entitled “Father Presence” and was developed in 11 topics. In Content and Appearance Validation, the Validity Index obtained an overall score of 0.97. Cronbach’s alpha was 0.92, indicating excellent reliability of its content. A global score of 74% for readability was obtained, considered easy to understand. Conclusions: the material was successful in the validation process, and it can be recommended for parents to use it during the prenatal period, promoting the inclusion of the partner and preparing them for labor and birth.
DOI: 10.6084/m9.figshare.20363101.v1
title: Diametric distribution modeling of forest species in arboreal Caatinga vegetation, Brazil

description: ABSTRACT The distribution modeling in diameter classes is an important indicator of the potential use of a forest community, as well as the projection of future forest production. The objective of this study was to evaluate the diametric structure and to select probabilistic density functions for three woody species in forested arboreal Caatinga vegetation in Bahia, Brazil. The study was carried out in the Contendas do Sincorá National Forest in the state of Bahia, Brazil. A total of 16 plots of 20 x 20 m were installed and all individuals with diameter at breast height equal to or greater than 5.0 cm were measured. The three species with the highest population density (Commiphora leptophloeos, Manihot catinga and Patagonula bahiensis) were selected for analysis and modeling of the diametric structure. Four probabilistic density models were adjusted. The Akaike information criterion was used to select the best model. The results found indicated that the three species presented a decreasing type curve. The Log-Normal function best described the diametric distribution and it can be indicated to describe the diametric distribution and assist in making decisions about the management and conservation of these species. It is concluded that the Normal function was less adequate to represent the distribution of the studied species.
DOI: 10.6084/m9.figshare.20363101
title: Diametric distribution modeling of forest species in arboreal Caatinga vegetation, Brazil

description: ABSTRACT The distribution modeling in diameter classes is an important indicator of the potential use of a forest community, as well as the projection of future forest production. The objective of this study was to evaluate the diametric structure and to select probabilistic density functions for three woody species in forested arboreal Caatinga vegetation in Bahia, Brazil. The study was carried out in the Contendas do Sincorá National Forest in the state of Bahia, Brazil. A total of 16 plots of 20 x 20 m were installed and all individuals with diameter at breast height equal to or greater than 5.0 cm were measured. The three species with the highest population density (Commiphora leptophloeos, Manihot catinga and Patagonula bahiensis) were selected for analysis and modeling of the diametric structure. Four probabilistic density models were adjusted. The Akaike information criterion was used to select the best model. The results found indicated that the three species presented a decreasing type curve. The Log-Normal function best described the diametric distribution and it can be indicated to describe the diametric distribution and assist in making decisions about the management and conservation of these species. It is concluded that the Normal function was less adequate to represent the distribution of the studied species.