cometadata/datacite-titles-descriptions-related-identifiers huggingface dataset:
DOI: 10.6084/m9.figshare.11314052.v1
title: Physical and chemical study of lattice kaolinites and their interaction with orthophosphate

description: ABSTRACT This study covers the evaluation of the structure and the capacity in adsorbing orthophosphate ions of kaolinites collected from sampling sites in Manaus (Brazil). The kaolinites were obtained using physical fractioning (sieving/siphoning) techniques and chemical treatment with HCl, H2SO4, H2O2 and KCl. The investigation of the kaolinite lattices involved the Hinckley and Plançon indexes determined from X-ray diffraction data, Fourier transformed infrared spectroscopy, scanning electron microscopy and Mössbauer spectroscopy. The absorption capacity of orthophosphate ions was calculated by Freundlich and Langergren isotherms. A transitional state was observed in the crystallographic structure from kaolinites because of the isomorphic substitution of Al3+ by Fe3+. This isomorphic substitution occurs accompanied by the optical pleochroism behavior, but it also reduces the mean particle sizes and increases the number of structural defects and magnetic properties of these kaolinites. Mössbauer spectroscopy showed that the substituting Fe3+ preferentially occupies octahedral sites. In the kaolinite lattices there are different octahedral sites of Al bounded by cis-OH-Fe3+ and trans-OH-Fe3+ octahedral sites. The kaolinite from the Kao1 sample has a higher number of cis-OH-Fe3+ from octahedral sites and is able to adsorb higher contents of orthophosphate ions than those from samples Kao2 and Kao3.
DOI: 10.6084/m9.figshare.11314055.v1
title: Evaluation of Mass Loss in Different Stages of Printed Circuit Boards Recycling Employed in Temperature Controllers

description: The aim of this work was to evaluate mass loss in each stage of the recycling process for metal recovery from PCBs of controllers and temperature indicators of cold chambers. The stages of process consists of grinding, particle size classification, magnetic and electrostatic separation. It was analyzed 13 kg of PCBs. These PCBs were crushed and ground. The ground material were subjected to magnetic and electrostatic separator. The losses in the comminution stages were 12.69 % and are lower than those found in other related works that used mixtures of different types of PCBs, whereas in this work only one model plates were analyzed. 27.2 % absolute mass loss we reached out after particle size separation with Tyler Series with 1 mm sieve presents the higher mass losses in the whole process and this fraction was not processed as it results in PCBs powder dust that interferes negatively in the electrostatic separation. Comparing the losses in the stages of shredding of PCBs employed in temperature controllers with other studies involving PCBs from the automotive industry and from computers and cell phones, is remarkable that this type of board presents significantly greater potential to be processed for recovery of its materials.
DOI: 10.6084/m9.figshare.11314043
title: Antioxidant properties, proximate content and cytotoxic activity of Echinophora tournefortii Jaub. & Spach

description: Abstract This work was designed to evaluate the phenolic, flavonoid content and biological activities (antioxidant and cytotoxic) of E. tournefortii extracts (methanol, acetone and water) as well as to determined proximate parameters (ash, fat, protein and carbohydrate). Among the three different extracts of E. tournefortii evaluated, the methanol extract, showed the highest amount of antioxidant activities (β-carotene, 88.62%). There were statistical differences among the radical scavenging (DPPH and ABTS) and antioxidant (phosphomolybdenum) activities of the different extracts of E. tournefortii. In the metal chelating and reducing power activities, the water extract exhibited the highest chelating and reducing capacity (29.88% and 0.206mg/mL respectively). All extracts of E. tournefortii exhibited cytotoxic activities and this plant possesses nutrients. These findings will provide addition information for the further investigation of this plant, for understanding the efficacy of E. tournefortii as a food ingredient, as well as for preventing oxidative stress mediated disorders.
DOI: 10.6084/m9.figshare.11314046
title: Modifications on Labels and Leaflets of Herbicides for Preventing and Managing Resistance

description: ABSTRACT: The challenge of managing herbicide-resistant weeds is an agricultural reality in Brazil that shall not be neglected. In this sense, Ministério da Agricultura, Pecuária e Abastecimento (MAPA) published Act No. 45 on July 14, 2017, provides the inclusion of a code system on labels and leaflets of insecticides, fungicides and herbicides, in order to demonstrate the mode of action of the active ingredient present in the product. In case of mix formulations, both molecules must be discriminated, adopting the same “Herbicide Resistance Action Committee - HRAC” international reference code. The Act No. 45 facilitates the process to choose and adopt products by all those involved in the chain production. It also collaborates with the possible to standardize the mixture of the products, since the need to mix products from different chemical groups to correct handling the resistance cases and avoiding potential new cases. In summary, the process of recognizing the mode of action and classification of herbicides was facilitated, as well as its practical adoption by technicians, growers and the chain production.
DOI: 10.6084/m9.figshare.11314034
title: Monitoring of stem cells from adipose tissue injected via retrobulbar next to previously injured optic nerve of rabbits

description: Abstract Obtective: To verify the presence of mesenchymal stem cells (MSC) in the area close to the optic nerve of previously injured with absolute alcohol. Methods: Twelve New Zealand breed rabbits were divided into two groups, and after sedation, each eye of the animal received a retrobulbar injection of 1 ml of absolute ethanol in one eye, and 1 ml of physiological solution 0.9 % (PS) in the contralateral eye. After 15 days all eyes of animals belonging to group A, received via retrobulbar a solution containing MSCs from human adipose tissue (AT) and previously marked with Qdots, while all eyes of animals from group B received solution containing PBS. Results: The presence of MSC was observed in 100% of the eyes of the animals of group A and the more central areas near and into the optic nerve. Conclusion: The results suggest that the appointment of MSC with Qdots allowed their follow-up applied in the region and in the inner areas of the optic nerve. The MSC permanence after 15 days of application around the optic nerve suggests the feasibility and possible involvement of the same during the damaged tissue regeneration process. Under the conditions of this study, the route of retrobulbar application and the presence of the stem cells to the central areas of the optic nerves in animals of group A, suggests that this might be an effective approach for MSCs in regeneration process of optic neuropathies.
DOI: 10.6084/m9.figshare.11314037
title: Competitive Ability of Canola Hybrids Resistant and Susceptible to Herbicides

description: ABSTRACT: This work aimed to compare the competitive ability of canola hybrids susceptible (conventional) or resistant to triazine or imidazolinone group herbicides, with turnip. The experiments were conducted in greenhouse, in a completely randomized design, with four replicates. The hybrids Hyola 571CL (resistant to imidazolinone), Hyola 555TT (resistant to triazine), and Hyola 61 (conventional) were used. The treatments consisted of ratios (100:0; 75:25; 50:50; 25:75; 0:100%) of canola and turnip plants. The evaluation was performed 44 days after emergence, determining the leaf área (AF), dry matter of aerial part (MSPA), and stature (EST) of the plants. The competitiveness analysis was performed through diagrams and interpretation of the competitiveness indexes. For the canola hybrids, the competition occurred by the same mean resources. There was damage to the crop growth in competition with the turnip. The turnip was not benefited only when in competition with Hyola 571CL hybrid, for the EST variable, and with the conventional canola, for the variable AF. There was significance for the competitiveness indexes, demonstrating that turnip is more competitive then the crop. Greater AF, MSPA, and EST occurred for canola plants in the smallest proportions of turnip and, for turnip plants, in the largest proportions of canola. The ability to compete with turnip is similar among hybrids, with injury to the crop and benefit to the weed, when competing. Interspecific competition is more damaging to canola hybrids; and intraspecific competition is more damaging to turnip.
DOI: 10.6084/m9.figshare.11314043.v1
title: Antioxidant properties, proximate content and cytotoxic activity of Echinophora tournefortii Jaub. & Spach

description: Abstract This work was designed to evaluate the phenolic, flavonoid content and biological activities (antioxidant and cytotoxic) of E. tournefortii extracts (methanol, acetone and water) as well as to determined proximate parameters (ash, fat, protein and carbohydrate). Among the three different extracts of E. tournefortii evaluated, the methanol extract, showed the highest amount of antioxidant activities (β-carotene, 88.62%). There were statistical differences among the radical scavenging (DPPH and ABTS) and antioxidant (phosphomolybdenum) activities of the different extracts of E. tournefortii. In the metal chelating and reducing power activities, the water extract exhibited the highest chelating and reducing capacity (29.88% and 0.206mg/mL respectively). All extracts of E. tournefortii exhibited cytotoxic activities and this plant possesses nutrients. These findings will provide addition information for the further investigation of this plant, for understanding the efficacy of E. tournefortii as a food ingredient, as well as for preventing oxidative stress mediated disorders.
DOI: 10.6084/m9.figshare.11314031
title: Evaluation of Phytoremediation Potential of Castor Cultivars for Heavy Metals from Soil

description: ABSTRACT: Phytoremediation is a useful tool to restore heavy metals contaminated soils. This study was carried out to test two castor (Ricinus communis) cultivars [Local and DS-30] for phytoextraction of heavy metals from the soil spiked by known concentrations of seven metals (Cu, Cr, Fe, Mn, Ni, Pb and Zn). A pot experiment was laid out by using a completely randomized design. Soil and plant samples were analyzed at 100 days after planting. The data on heavy metal uptake by plant tissues (roots, leaves and shoots) of the two castor cultivars suggested that a considerable amount of metals (Fe = 27.18 mg L-1; Cu = 5.06 mg L-1; Cr = 2.95 mg L-1; Mn = 0.22 mg L-1; Ni = 4.66 mg L-1; Pb = 3.33 mg L-1; Zn = 15.04 mg L-1) was accumulated in the plant biomass. The soil heavy metal content at the end of experiment significantly decreased with both cultivars, resulting in improved soil quality. Therefore, it is concluded that both castor cultivars, Local and DS-30, can be used for phytoremediation of heavy metal-contaminated sites.
DOI: 10.6084/m9.figshare.11314037.v1
title: Competitive Ability of Canola Hybrids Resistant and Susceptible to Herbicides

description: ABSTRACT: This work aimed to compare the competitive ability of canola hybrids susceptible (conventional) or resistant to triazine or imidazolinone group herbicides, with turnip. The experiments were conducted in greenhouse, in a completely randomized design, with four replicates. The hybrids Hyola 571CL (resistant to imidazolinone), Hyola 555TT (resistant to triazine), and Hyola 61 (conventional) were used. The treatments consisted of ratios (100:0; 75:25; 50:50; 25:75; 0:100%) of canola and turnip plants. The evaluation was performed 44 days after emergence, determining the leaf área (AF), dry matter of aerial part (MSPA), and stature (EST) of the plants. The competitiveness analysis was performed through diagrams and interpretation of the competitiveness indexes. For the canola hybrids, the competition occurred by the same mean resources. There was damage to the crop growth in competition with the turnip. The turnip was not benefited only when in competition with Hyola 571CL hybrid, for the EST variable, and with the conventional canola, for the variable AF. There was significance for the competitiveness indexes, demonstrating that turnip is more competitive then the crop. Greater AF, MSPA, and EST occurred for canola plants in the smallest proportions of turnip and, for turnip plants, in the largest proportions of canola. The ability to compete with turnip is similar among hybrids, with injury to the crop and benefit to the weed, when competing. Interspecific competition is more damaging to canola hybrids; and intraspecific competition is more damaging to turnip.
DOI: 10.6084/m9.figshare.11314040
title: Morphological and molecular identification with frequency analysis of Calicophoron microbothrioides in central Chile

description: Abstract This research aimed to determine the presence of paramphistomids in cattle slaughtered in a slaughterhouse of the Ñuble Region of Chile, to identify flukes and to analyze the frequency of these parasites in the Maule, Ñuble, and Biobío administrative regions of Chile. Between October of 2016 and April of 2017, rumens of 494 cattle were examined for flukes in the forestomachs. Worms were identified morphologically and, in addition, molecular analysis of the internal transcriber spacer region 2 of the fluke’s DNA was done and phylogenetic analyses were performed with Bayesian inference in 14 worms. The frequency was analyzed by locality (low- or highlands) and age. The overall frequency was 11.24%. The district with the highest frequency of presentation was Chillán Viejo (30.8%). Districts in the lowlands had similar frequencies to those in the mountain lands (p=0.1). The frequency of flukes was significantly higher in adult animals than in young ones (p&lt;0.01). We obtained a 460 bp-length fragment of DNA that was identical to the sequences previously identified as Paramphistomum cervi and Calicophoron microbothrioides, and performed morphological analyses confirmed that our samples belonged to C. microbothrioides. This is the first published study of C. microbothrioides in Chile.
DOI: 10.6084/m9.figshare.11314046.v1
title: Modifications on Labels and Leaflets of Herbicides for Preventing and Managing Resistance

description: ABSTRACT: The challenge of managing herbicide-resistant weeds is an agricultural reality in Brazil that shall not be neglected. In this sense, Ministério da Agricultura, Pecuária e Abastecimento (MAPA) published Act No. 45 on July 14, 2017, provides the inclusion of a code system on labels and leaflets of insecticides, fungicides and herbicides, in order to demonstrate the mode of action of the active ingredient present in the product. In case of mix formulations, both molecules must be discriminated, adopting the same “Herbicide Resistance Action Committee - HRAC” international reference code. The Act No. 45 facilitates the process to choose and adopt products by all those involved in the chain production. It also collaborates with the possible to standardize the mixture of the products, since the need to mix products from different chemical groups to correct handling the resistance cases and avoiding potential new cases. In summary, the process of recognizing the mode of action and classification of herbicides was facilitated, as well as its practical adoption by technicians, growers and the chain production.
DOI: 10.6084/m9.figshare.11314028
title: SBEM and knowledge production for Mathematical Education

description: Abstract At the end of 1980s, with the creation of SBEM (Brazilian Society of Mathematical Education), the scientific space of Mathematical Education was expanded to new times, in which modern Mathematics declined and technological advances rose up, especially concerning the questioning of mathematics teachers’ professional knowledge. Within the scope of these questionings, along with the appreciation of the subjective aspects in teacher's training, there are concerns about the complexity involved in the characterization of professional knowledge and the difficulty of systematizing them in face of their transformation into institutionalized knowledge. Based on the assumption that professional knowledges are those that have undergone complex processes of objectification and systematization until they become institutionalized and integrate the formation of a certain socially recognized profession, we selected six seminal studies in an attempt to understand what knowledge was considered essential for the teacher to teach Mathematics nowadays. The results point out to the existence of a non-dispersed and fragmented formation, capable of expressing an appropriate professional sense for a new century, that puts in tune knowledge of the reference science with knowledge of educational sciences, Mathematics teaching knowledge with art and science and, suitable for teaching in an ever-changing world.
DOI: 10.6084/m9.figshare.11314040.v1
title: Morphological and molecular identification with frequency analysis of Calicophoron microbothrioides in central Chile

description: Abstract This research aimed to determine the presence of paramphistomids in cattle slaughtered in a slaughterhouse of the Ñuble Region of Chile, to identify flukes and to analyze the frequency of these parasites in the Maule, Ñuble, and Biobío administrative regions of Chile. Between October of 2016 and April of 2017, rumens of 494 cattle were examined for flukes in the forestomachs. Worms were identified morphologically and, in addition, molecular analysis of the internal transcriber spacer region 2 of the fluke’s DNA was done and phylogenetic analyses were performed with Bayesian inference in 14 worms. The frequency was analyzed by locality (low- or highlands) and age. The overall frequency was 11.24%. The district with the highest frequency of presentation was Chillán Viejo (30.8%). Districts in the lowlands had similar frequencies to those in the mountain lands (p=0.1). The frequency of flukes was significantly higher in adult animals than in young ones (p&lt;0.01). We obtained a 460 bp-length fragment of DNA that was identical to the sequences previously identified as Paramphistomum cervi and Calicophoron microbothrioides, and performed morphological analyses confirmed that our samples belonged to C. microbothrioides. This is the first published study of C. microbothrioides in Chile.
DOI: 10.6084/m9.figshare.11314022
title: Parasitological and histological aspects of Holochilus sciureus naturally infected by Schistosoma mansoni

description: Abstract Schistosomiasis is a neglected disease that affects millions of people around the world, being common in the state of Maranhão. A total of 225 rodents of the Holochilus sciureus species from the Western Lowland Maranhão were studied, of which 144 animals (64%) exhibited Schistosoma eggs in their feces samples. Macroscopic lesions characterized as well-defined whitish areas on the liver and spleen surfaces were observed. Histopathological examination revealed multifocal granulomas in the esophagus, liver, spleen, pancreas and duodenum, with structures compatible with Schistosoma mansoni eggs, as well as severe hepatic micro-vacuolar degeneration, multifocal and coalescent, with proliferation of random bile ducts and associated epithelial hyperplasia to areas of fibrosis. Adult forms of the parasite were observed in the blood vessels of the portal space. The lungs exhibited moderate and diffuse interstitial pneumonia with intralesional S. mansoni eggs. In the kidneys, hyaline cylinders were observed in the pelvis and diffuse hemorrhage. In conclusion, H. sciureus displays a pathological picture similar to human being. This rodent plays a role as sentinel in Baixada Maranhense.
DOI: 10.6084/m9.figshare.11314025
title: Gastrointestinal helminths and related histopathological lesions in black-necked swans Cygnus melancoryphus from the Carlos Anwandter Nature Sanctuary, Southern Chile

description: Abstract Black-necked swans are distributed across South America and face conservation problems in Chile according to data of the State institution SAG. The aim of this study was to identify helminths and to assess associated tissue damage via histopathology. A total of 19,291 parasites were isolated from 21 examined birds; 17 species were identified, including nematodes, flukes, and tapeworms. Of these, 12 were new host records, 13 were reported for the first time in Chile, and 5 were new records for the Neotropical region. Further, the flukes Schistosomatidae gen. sp. and Echinostoma echinatum are of zoonotic concern. Regarding histopathology, an inflammatory response was found along the birds’ entire digestive tract. Nevertheless, it is difficult to declare that there is a clear association between such lesions and isolated parasites, as other noxa could be responsible as well. Although in some cases there was an evident association, such inflammatory responses and necrosis were minimal, as occurred with Capillaria, Retinometra, Catatropis, Echinostoma, and Schistosomatidae gen. sp. Nevertheless, Epomidiostomum vogelsangi caused granulomatous injuries, an important inflammatory response, and necrosis, but it always circumscribed to superficial layers of the gizzard. Conversely, Paramonostomum was not associated with an inflammatory response despite a high parasitic load.
DOI: 10.6084/m9.figshare.11314031.v1
title: Evaluation of Phytoremediation Potential of Castor Cultivars for Heavy Metals from Soil

description: ABSTRACT: Phytoremediation is a useful tool to restore heavy metals contaminated soils. This study was carried out to test two castor (Ricinus communis) cultivars [Local and DS-30] for phytoextraction of heavy metals from the soil spiked by known concentrations of seven metals (Cu, Cr, Fe, Mn, Ni, Pb and Zn). A pot experiment was laid out by using a completely randomized design. Soil and plant samples were analyzed at 100 days after planting. The data on heavy metal uptake by plant tissues (roots, leaves and shoots) of the two castor cultivars suggested that a considerable amount of metals (Fe = 27.18 mg L-1; Cu = 5.06 mg L-1; Cr = 2.95 mg L-1; Mn = 0.22 mg L-1; Ni = 4.66 mg L-1; Pb = 3.33 mg L-1; Zn = 15.04 mg L-1) was accumulated in the plant biomass. The soil heavy metal content at the end of experiment significantly decreased with both cultivars, resulting in improved soil quality. Therefore, it is concluded that both castor cultivars, Local and DS-30, can be used for phytoremediation of heavy metal-contaminated sites.