cometadata/datacite-titles-descriptions-related-identifiers huggingface dataset:
DOI: 10.6084/m9.figshare.6857882
title: Synthesis of poly(ethyl methacrylate-co-methyl methacrylate) obtained via ATRP using ruthenium benzylidene complexes

description: Abstract Atom-Transfer Radical Copolymerization (ATRP) of methyl methacrylate (MMA) and ethyl methacrylate (EMA) under different reaction conditions was conducted using Grubbs 1st ( 1) and 2nd (2) generation catalysts. Initially, the study focused on the reactivity of the catalysts in ATRP of EMA individually, then the syntheses of poly(MMA-co-EMA) were also conducted in different mixtures of monomers ([MMA]/[EMA] = 100/200 and [MMA]/[EMA] = 200/100). Conversion and semilogarithmic kinetic plots as a function of time were related to the different catalysts and reaction conditions. The values of Mn and PDI also changed when different catalysts were used in the presence of Al(OiPr)3, and more controlled polymerizations were achieved using 1. In the syntheses of poly(MMA)-co -(EMA), conversion of 60% was reached for both catalysts at different [MMA]/[EMA] ratios for 16 h; however, for shorter time, 4 h, better conversion values were obtained using 1 as catalyst for both [MMA]/[EMA] = 100/200 or 200/100.
DOI: 10.6084/m9.figshare.6857879.v1
title: Chitosan and gum arabic nanoparticles for heavy metal adsorption

description: Abstract Chitosan (CT) is a polysaccharide with the ability to adsorb metals on its surface. In this work, CT-based nanoparticles (NPs) are produced by complex formation with gum arabic (GA) to increase their adsorbent potential for removal of heavy metals in aqueous medium. Adsorption efficiency is evaluated as a function of NP composition and polysaccharide concentration. NPs are sized from 250 to 375 nm at a zeta potential up to -25 mV, suggesting stability to adsorb metals. In particular, CTGA56 and CTGA80 NPs adsorbed a substantially higher amount of copper ions than pure CT. Adsorption kinetics studies showed that the reaction process followed a pseudo second-order model and the adsorption isotherm results fit a Langmuir model, highlighting the monolayer adsorption process with prominent adsorption capacity. These findings indicate the adsorbent potential of CTGA NPs and suggest that these particles can be used for removal of metal ions from contaminated water sources.
DOI: 10.6084/m9.figshare.6857882.v1
title: Synthesis of poly(ethyl methacrylate-co-methyl methacrylate) obtained via ATRP using ruthenium benzylidene complexes

description: Abstract Atom-Transfer Radical Copolymerization (ATRP) of methyl methacrylate (MMA) and ethyl methacrylate (EMA) under different reaction conditions was conducted using Grubbs 1st ( 1) and 2nd (2) generation catalysts. Initially, the study focused on the reactivity of the catalysts in ATRP of EMA individually, then the syntheses of poly(MMA-co-EMA) were also conducted in different mixtures of monomers ([MMA]/[EMA] = 100/200 and [MMA]/[EMA] = 200/100). Conversion and semilogarithmic kinetic plots as a function of time were related to the different catalysts and reaction conditions. The values of Mn and PDI also changed when different catalysts were used in the presence of Al(OiPr)3, and more controlled polymerizations were achieved using 1. In the syntheses of poly(MMA)-co -(EMA), conversion of 60% was reached for both catalysts at different [MMA]/[EMA] ratios for 16 h; however, for shorter time, 4 h, better conversion values were obtained using 1 as catalyst for both [MMA]/[EMA] = 100/200 or 200/100.
DOI: 10.6084/m9.figshare.6857873
title: Small but troublesome: accessory ossicles with clinical significance

description: Abstract Accessory ossicles are supernumerary and inconstant structures that are not caused by fractures. Derived from unfused ossification centers, accessory ossicles were first described by Vesalius in 1543. For centuries, they were believed to be asymptomatic. However, with advances in radiology techniques, many have been associated with painful syndromes. Although the original descriptions date from the sixteenth century, the subject is little discussed and, in some cases, controversial. The objective of this study was to describe the radiological aspects of a series of accessory ossicles and to review the evolution of their various descriptions, in order to revive discussion of the subject.
DOI: 10.6084/m9.figshare.6857876
title: Water-uptake properties of a fish protein-based superabsorbent hydrogel chemically modified with ethanol

description: Abstract Hydrophilic polymers can form hydrogels, which are able to absorb and retain as much water as one hundred times their weight. Polymers based on natural products have been drawing attention since they are biocompatible, biodegradable and nontoxic. The aims of this study were to produce and to characterize a biopolymer with superabsorbent properties from fish protein isolates. Hydrogels were produced from protein isolates from Whitemouth croaker processing wastes chemically modified. The extension of change in lysine residues, kinetics in water-uptake capacity, pH effect, ionic strength over the absorption of water by hydrogels and the behavior of the biopolymer when subject to successive hydration and dehydrations were investigated. Results showed that acid modified protein without ethanol treatment reached a maximum absorption of 103.25 gwater/gdry gel, while the same sample modified with ethanol reached 216.05 gwater/gdry gel.
DOI: 10.6084/m9.figshare.6857876.v1
title: Water-uptake properties of a fish protein-based superabsorbent hydrogel chemically modified with ethanol

description: Abstract Hydrophilic polymers can form hydrogels, which are able to absorb and retain as much water as one hundred times their weight. Polymers based on natural products have been drawing attention since they are biocompatible, biodegradable and nontoxic. The aims of this study were to produce and to characterize a biopolymer with superabsorbent properties from fish protein isolates. Hydrogels were produced from protein isolates from Whitemouth croaker processing wastes chemically modified. The extension of change in lysine residues, kinetics in water-uptake capacity, pH effect, ionic strength over the absorption of water by hydrogels and the behavior of the biopolymer when subject to successive hydration and dehydrations were investigated. Results showed that acid modified protein without ethanol treatment reached a maximum absorption of 103.25 gwater/gdry gel, while the same sample modified with ethanol reached 216.05 gwater/gdry gel.
DOI: 10.6084/m9.figshare.6857873.v1
title: Small but troublesome: accessory ossicles with clinical significance

description: Abstract Accessory ossicles are supernumerary and inconstant structures that are not caused by fractures. Derived from unfused ossification centers, accessory ossicles were first described by Vesalius in 1543. For centuries, they were believed to be asymptomatic. However, with advances in radiology techniques, many have been associated with painful syndromes. Although the original descriptions date from the sixteenth century, the subject is little discussed and, in some cases, controversial. The objective of this study was to describe the radiological aspects of a series of accessory ossicles and to review the evolution of their various descriptions, in order to revive discussion of the subject.
DOI: 10.6084/m9.figshare.6857870
title: Litter stock in a forest in process of restoration after bauxite mining

description: Abstract The present study had as objective to evaluate the accumulated litter in two environments, a forest under restoration, after the bauxite mining, and a reference ecosystem (remaining secondary forest in a midsuccessional stage), and investigate the relationship between environmental variables (canopy opening, soil compaction, natural regeneration) and litter accumulation in both forests. Thirty plots of 2 × 2 m in each forest were allocated. In the center of each plot, all organic material contained in samples of 0.5 × 0.5 m was collected to obtain the dry mass. There is dissimilarity between the two forests, in relation to the litter stock and other environmental variables evaluated. The forest in restoration presents less litter accumulation than the reference ecosystem. The largest litter accumulation in both forests occurs in sites with higher number of individuals in the natural regeneration layer and in sites with lower soil compaction.
DOI: 10.6084/m9.figshare.6857870.v1
title: Litter stock in a forest in process of restoration after bauxite mining

description: Abstract The present study had as objective to evaluate the accumulated litter in two environments, a forest under restoration, after the bauxite mining, and a reference ecosystem (remaining secondary forest in a midsuccessional stage), and investigate the relationship between environmental variables (canopy opening, soil compaction, natural regeneration) and litter accumulation in both forests. Thirty plots of 2 × 2 m in each forest were allocated. In the center of each plot, all organic material contained in samples of 0.5 × 0.5 m was collected to obtain the dry mass. There is dissimilarity between the two forests, in relation to the litter stock and other environmental variables evaluated. The forest in restoration presents less litter accumulation than the reference ecosystem. The largest litter accumulation in both forests occurs in sites with higher number of individuals in the natural regeneration layer and in sites with lower soil compaction.
DOI: 10.6084/m9.figshare.6857864
title: The genera Besleria, Codonanthe, Gloxinia, Napeanthus, Nematanthus and Seemannia (Gesneriaceae) in the state of Paraná

description: Abstract The family Gesneriaceae has seven genera and 39 species in the state of Paraná: Besleria (1 sp), Codonanthe (3), Gloxinia (1), Napeanthus (2), Nematanthus (6), Seemannia (1) and Sinningia (25). In this work we present a taxonomic treatment for the first six genera, i.e. for the whole Family except for Sinningia, whose monograph is in preparation. We provide an identification key for species, descriptions, data on distribution and phenology and illustrations for each species recorded to Paraná.
DOI: 10.6084/m9.figshare.6857864.v1
title: The genera Besleria, Codonanthe, Gloxinia, Napeanthus, Nematanthus and Seemannia (Gesneriaceae) in the state of Paraná

description: Abstract The family Gesneriaceae has seven genera and 39 species in the state of Paraná: Besleria (1 sp), Codonanthe (3), Gloxinia (1), Napeanthus (2), Nematanthus (6), Seemannia (1) and Sinningia (25). In this work we present a taxonomic treatment for the first six genera, i.e. for the whole Family except for Sinningia, whose monograph is in preparation. We provide an identification key for species, descriptions, data on distribution and phenology and illustrations for each species recorded to Paraná.
DOI: 10.6084/m9.figshare.6857858
title: Use of a GnRH synthetic analog (buserelin) for estrous induction in female dogs

description: ABSTRACT The aim of this study was to evaluate the effectiveness of a GnRH synthetic analog, as an estrous inducer in female dogs when administered during the anestrous phase, and to evaluate the pregnancy rate achieved through natural copulation. For this purpose, ten female dogs of different breeds were used. The subjects received buserelin by intramuscular injections at a dose of 2,1mcg when female dogs weighed up to 10kg (Group 1) and of 4,2mcg when the dogs weighed above 10kg (Group 2). Of the ten subjects, only three presented estrus after a single injection of buserelin: two dogs from Group 1 and one dog from Group 2 on average 7±1.29 days. The remaining seven dogs were given a second dose of buserelin, equal to the first administration. Of these, three belonged to Group 1 and four to Group 2. Four of these dogs exhibited clinical signs of estrus within, on average 9±7.3 days from the second injection. The seven female dogs that did enter estrus were fertilized successfully through natural copulation. The administration of buserelin was effective in inducing estrus in female dogs during the anestrous phase, with a maximum of two administrations.
DOI: 10.6084/m9.figshare.6857858.v1
title: Use of a GnRH synthetic analog (buserelin) for estrous induction in female dogs

description: ABSTRACT The aim of this study was to evaluate the effectiveness of a GnRH synthetic analog, as an estrous inducer in female dogs when administered during the anestrous phase, and to evaluate the pregnancy rate achieved through natural copulation. For this purpose, ten female dogs of different breeds were used. The subjects received buserelin by intramuscular injections at a dose of 2,1mcg when female dogs weighed up to 10kg (Group 1) and of 4,2mcg when the dogs weighed above 10kg (Group 2). Of the ten subjects, only three presented estrus after a single injection of buserelin: two dogs from Group 1 and one dog from Group 2 on average 7±1.29 days. The remaining seven dogs were given a second dose of buserelin, equal to the first administration. Of these, three belonged to Group 1 and four to Group 2. Four of these dogs exhibited clinical signs of estrus within, on average 9±7.3 days from the second injection. The seven female dogs that did enter estrus were fertilized successfully through natural copulation. The administration of buserelin was effective in inducing estrus in female dogs during the anestrous phase, with a maximum of two administrations.
DOI: 10.6084/m9.figshare.6857852
title: Cost-effectiveness of Carbetocin versus Oxytocin for Prevention of Postpartum Hemorrhage Resulting from Uterine Atony in Women at high-risk for bleeding in Colombia

description: Abstract Objective To assess the cost-effectiveness of carbetocin versus oxytocin for prevention of postpartum hemorrhage (PPH) due to uterine atony after vaginal delivery/ cesarean section in women with risk factors for bleeding. Methods A decision treewas developed for vaginal delivery andanother one for cesarean, in which a sequential analysis of the results was obtained with the use of carbetocin and oxytocin for prevention of PPH and related consequences. A third-party payer perspective was used; only directmedical costs were considered. Incremental costs and effectiveness in terms of quality-adjusted life years (QALYs) were evaluated for a one-year timehorizon. The costs were expressed in 2016 Colombian pesos (1 USD = 3,051 Col$). Results In the vaginal delivery model, the average cost of care for a patient receiving prophylaxis with uterotonic agents was Col$ 347,750 with carbetocin and Col$ 262,491 with oxytocin,while theQALYs were 0.9980 and 0.9979, respectively. The incremental costeffectiveness ratio is above the cost-effectiveness threshold adopted by Colombia. In the model developed for cesarean section, the average cost of a patient receiving prophylaxis with uterotonics was Col$ 461,750 with carbetocin, and Col$ 481,866 with oxytocin, and the QALYs were 0.9959 and 0.9926, respectively. Carbetocin has lower cost and is more effective, with a saving of Col$ 94,887 per avoided hemorrhagic event. Conclusion In case of elective cesarean delivery, carbetocin is a dominant alternative in the prevention of PPH compared with oxytocin; however, it presents higher costs than oxytocin, with similar effectiveness, in cases of vaginal delivery.
DOI: 10.6084/m9.figshare.6857855
title: The genus Catopsis (Bromeliaceae: Tillandsioideae) in the Paraná state: taxonomic and anatomical aspects

description: Abstract Catopsis is represented by 19 species distributed among the three Americas. Two species occurs in Brazil, Catopsis berteroniana distributed in Northeast, Southeast and South region and Catopsis sessiliflora, with a broadly distribution, also found in the North. The aim of this work was to perform a taxonomic and morphoanatomic study of the species of Catopsis occuring in Paraná state. In order to do so, botanical expeditions occurred during the periods of Jul/2013-Jun/2014 just as the visits to HUPG, MBM and UPCB herbarium. The collected specimens were identified, herborized, and deposited in the HUPG herbarium. For the morphoanatomic study semi-permanent slides were prepared from the middle region of the sheath and leaf from transverse and longitudinal sections obtained free hand and mounted in glycerinated gelatin. For Scanning Electron Microscopy analysis portions of leaf blade and sheath were dehydrated for observation. As results, we provide descriptions, period of flowering and fruiting, identification keys, geographic distribution, the ecophysiological rating, morphology and anatomy comments, and conservation status of the species.
DOI: 10.6084/m9.figshare.6857852.v1
title: Cost-effectiveness of Carbetocin versus Oxytocin for Prevention of Postpartum Hemorrhage Resulting from Uterine Atony in Women at high-risk for bleeding in Colombia

description: Abstract Objective To assess the cost-effectiveness of carbetocin versus oxytocin for prevention of postpartum hemorrhage (PPH) due to uterine atony after vaginal delivery/ cesarean section in women with risk factors for bleeding. Methods A decision treewas developed for vaginal delivery andanother one for cesarean, in which a sequential analysis of the results was obtained with the use of carbetocin and oxytocin for prevention of PPH and related consequences. A third-party payer perspective was used; only directmedical costs were considered. Incremental costs and effectiveness in terms of quality-adjusted life years (QALYs) were evaluated for a one-year timehorizon. The costs were expressed in 2016 Colombian pesos (1 USD = 3,051 Col$). Results In the vaginal delivery model, the average cost of care for a patient receiving prophylaxis with uterotonic agents was Col$ 347,750 with carbetocin and Col$ 262,491 with oxytocin,while theQALYs were 0.9980 and 0.9979, respectively. The incremental costeffectiveness ratio is above the cost-effectiveness threshold adopted by Colombia. In the model developed for cesarean section, the average cost of a patient receiving prophylaxis with uterotonics was Col$ 461,750 with carbetocin, and Col$ 481,866 with oxytocin, and the QALYs were 0.9959 and 0.9926, respectively. Carbetocin has lower cost and is more effective, with a saving of Col$ 94,887 per avoided hemorrhagic event. Conclusion In case of elective cesarean delivery, carbetocin is a dominant alternative in the prevention of PPH compared with oxytocin; however, it presents higher costs than oxytocin, with similar effectiveness, in cases of vaginal delivery.
DOI: 10.6084/m9.figshare.6857846
title: Pedogenic iron oxides in soils of the Acre State, Brazil

description: ABSTRACT: Iron oxides are environmental indicators and influence on physical and chemical behavior of soils. This research aimed to identify and characterize pedogenic iron oxides in soils of the Acre state, Brazil. The soils developed from sedimentary rocks of the Solimões Formation. Twenty one samples of subsurface horizons were collected from ten soil profiles. Soil samples were analyzed by x-ray diffractometry associated to selective chemical dissolutions. Fe contents in the clay minerals (Fes), in the pedogenic iron oxides (Fed) and in the poorly crystalline oxides (Feo) were determined. The Al3+-substitution and the mean crystal diameter of goethite and hematite were estimated. Soils presented low contents of Fes and Fed. The Fed/Fes ratio indicated soils in the intermediate stage of weathering, with dominance of goethite, hematite and maghemite. This condition of weathering was confirmed by the higher frequency of goethites and hematite with intermediate Al3+-substitution. Goethites have isodimensional forms and hematite have flat plaques forms.
DOI: 10.6084/m9.figshare.6857849
title: Acquiring the notion of learning hypotheses in mathematics teacher education

description: Abstract The notion of hypothetical learning trajectory has generated much interest among experts in mathematics education. It is proposed that this notion is a useful tool in teachers’ teaching practice and that it is necessary to prepare teachers in their capacity to formulate hypothetical learning trajectories about specific mathematics school topics. It is therefore also necessary to explore the learning processes that teachers undergo when learning this notion in their education. In this article, we introduce the notion of learning hypotheses as an adaptation of the idea of hypothetical learning trajectory (SIMON, 1995). We describe how the groups of secondary-school mathematics teachers that participated in a teacher education program understood and used this notion in order to determine the contribution of a set of tasks to a learning goal previously established. We found that the groups developed their knowledge of the notion of learning hypotheses and used it in a heterogeneous way, and that the education program was partly successful in its goal to make the groups of teachers learn and perceive the notion’s utility.
DOI: 10.6084/m9.figshare.6857855.v1
title: The genus Catopsis (Bromeliaceae: Tillandsioideae) in the Paraná state: taxonomic and anatomical aspects

description: Abstract Catopsis is represented by 19 species distributed among the three Americas. Two species occurs in Brazil, Catopsis berteroniana distributed in Northeast, Southeast and South region and Catopsis sessiliflora, with a broadly distribution, also found in the North. The aim of this work was to perform a taxonomic and morphoanatomic study of the species of Catopsis occuring in Paraná state. In order to do so, botanical expeditions occurred during the periods of Jul/2013-Jun/2014 just as the visits to HUPG, MBM and UPCB herbarium. The collected specimens were identified, herborized, and deposited in the HUPG herbarium. For the morphoanatomic study semi-permanent slides were prepared from the middle region of the sheath and leaf from transverse and longitudinal sections obtained free hand and mounted in glycerinated gelatin. For Scanning Electron Microscopy analysis portions of leaf blade and sheath were dehydrated for observation. As results, we provide descriptions, period of flowering and fruiting, identification keys, geographic distribution, the ecophysiological rating, morphology and anatomy comments, and conservation status of the species.
DOI: 10.6084/m9.figshare.6857846.v1
title: Pedogenic iron oxides in soils of the Acre State, Brazil

description: ABSTRACT: Iron oxides are environmental indicators and influence on physical and chemical behavior of soils. This research aimed to identify and characterize pedogenic iron oxides in soils of the Acre state, Brazil. The soils developed from sedimentary rocks of the Solimões Formation. Twenty one samples of subsurface horizons were collected from ten soil profiles. Soil samples were analyzed by x-ray diffractometry associated to selective chemical dissolutions. Fe contents in the clay minerals (Fes), in the pedogenic iron oxides (Fed) and in the poorly crystalline oxides (Feo) were determined. The Al3+-substitution and the mean crystal diameter of goethite and hematite were estimated. Soils presented low contents of Fes and Fed. The Fed/Fes ratio indicated soils in the intermediate stage of weathering, with dominance of goethite, hematite and maghemite. This condition of weathering was confirmed by the higher frequency of goethites and hematite with intermediate Al3+-substitution. Goethites have isodimensional forms and hematite have flat plaques forms.