cometadata/datacite-titles-descriptions-related-identifiers huggingface dataset:
DOI: 10.6084/m9.figshare.9276290.v1
title: Air Temperature on Reproductive Development of Olive Cultivars

description: Abstract The air temperature is the meteorological variable that most influences the reproductive development of the olive tree. The knowledge of the effects of the air temperature is important to optimize the management strategies and to choose the cultivars are more adapted to climatic condition. The thermal time (STa, ºC.day) was used to identify the influence of temperature on three subperiods of reproductive development (flowering, fruit ripening and maturation) in ten olive cultivars, and to estimate the base temperature (Tb, °C) to STa. The data used refer to the variables beginning, end and duration (in days) for the agricultural years 2008/2009,2009/2010 and 2010/2011, cultivated in Maria da Fé, MG (22° 18’ 50” S, 45° 22’ 23” W, 1276 m). There was variation of Tb and STa values between cultivars and subperiods of reproductive development. Tb’s varied for flowering: 7.8 °C to 16.1 °C, fruit ripening: 13.3 °C to 14.3 °C, and maturation: 7.1 °C to 17.2 °C. The fruit ripening is the subperiod that needs greater thermal time, independently of olive cultivars.
DOI: 10.6084/m9.figshare.9276278
title: Gibberellic acid reduces clusters rot of ‘Sauvignon blanc’ grapes

description: Abstract The ripening of grapes is impaired by climatic conditions due to the prolonged rainy season and thus facilitates the proliferation of diseases such as grape clusters rotting, caused by the fungus Botrytis cinerea, even before the ideal harvesting point. The aim of the study was to evaluate the effect of gibberellic acid (GA3) on rot and on physical-chemical quality of ‘Sauvignon Blanc’ grapevine. The experiment was carried out in the production season of 2016 and 2017 in Campanha region in Rio Grande do Sul, Brazil. The GA3 treatments were at the doses of 0 (control); 2; 4; 6 and 8 mg L-1 of GA3. The percentage of clusters rotting and maturation index decreased, however, the titratable acidity increased with GA3 doses. The cluster and rachis length increased with application of GA3. The cluster width; cluster, rachis and berry mass and the soluble solids were not influenced by application of GA3. In ‘Sauvignon Blanc’ grapevine, GA3 reduced the percentage of clusters rotting and improved the cluster and rachis length characteristics and titrable acidity.
DOI: 10.6084/m9.figshare.9276284.v1
title: Rainfall Intensity-Duration-Frequency Relationships for Risk Analysis in the Region of Matopiba, Brazil

description: Abstract The region of study was MATOPIBA, located in the north of Brazilian Savanna biome (Cerrado), encompassing part of north/northeast of Brazil. The region has been gaining prominence in the last years due to the expansion of agricultural over this area. The aims of this study were: to adjust parameters for rainfall intensity-duration-frequency; and to identify the most vulnerable agricultural areas to erosion based on erosivity and erodibility. The rainfall intensity-duration-frequency function were adjusted using series of maximum annual rainfall event from 105 rainfall gauges. Gumbel model was the most efficient to simulate the maximum rainfall intensity, where these data were used to adjusted the rainfall intensity-duration-frequency model based on K, a, b and c parameters. The most rainfall gauges showed intensity between 51 and 80 mm h-1 and 81 and 120 mm h-1, respectively, for return period of 2 and 100 years with rainfall duration of 30 minutes. The higher rainfall intensity was observed mainly in the central-north of the region associated with rainfall systems. The rainfall intensity showed a huge capacity to cause soil erosion based on the erosivity energy, while the moderate erodibility was observed for areas with Ferralsols and Leptosols and low erodibility for areas with Arenosols.
DOI: 10.6084/m9.figshare.9276275
title: Soil conservation management with cover crops: effects on critical energy levels, release and dispersion of aggregates

description: ABSTRACT The normalized dispersion index (NDI) and the b/a index are commonly used to express the stability of aggregates measured by ultrasound. However, few studies have used the critical energy (CE) extracted from modeling to explain the effects of soil use and management on soil aggregation. The objective of this study was to evaluate the influence of soil cover on the CE level required for dispersion of aggregates of a Typic Hapludalf. Soil samples collected from the 0.0-0.05 m depth were evaluated in five different managements with cover plants: perennial soybean (PS), peanuts (P), spontaneous vegetation (SV), black oat/forage turnip (BOFT), and black oat/hairy vetch (BOHV). Aggregates ? 2 mm of the treatments were exposed to ultrasonic irradiation during 0, 30, 60, 120 and 180 s. The specific applied energies were calculated based on sonification time and potency: 0, 745, 1490, 2980, and 4470 J·g–1. After each sonification, sand (2000-53 ?m), silt (53-2 ?m) and clay (&lt; 2 ?m) were quantified. The mass of aggregates of each size class was modeled as a function of the ultrasonic energy. The CE, the NDI and the b/a indexes were coefficients extracted from these models. Cover crops influenced the critical energy levels required for dispersion of aggregates of the Typic Hapludalf. However, our methodology did not prove management systems with intercrops of the cover crops, as black oats and vetch, contribute more effectively to the increase of soil aggregation.
DOI: 10.6084/m9.figshare.9276278.v1
title: Gibberellic acid reduces clusters rot of ‘Sauvignon blanc’ grapes

description: Abstract The ripening of grapes is impaired by climatic conditions due to the prolonged rainy season and thus facilitates the proliferation of diseases such as grape clusters rotting, caused by the fungus Botrytis cinerea, even before the ideal harvesting point. The aim of the study was to evaluate the effect of gibberellic acid (GA3) on rot and on physical-chemical quality of ‘Sauvignon Blanc’ grapevine. The experiment was carried out in the production season of 2016 and 2017 in Campanha region in Rio Grande do Sul, Brazil. The GA3 treatments were at the doses of 0 (control); 2; 4; 6 and 8 mg L-1 of GA3. The percentage of clusters rotting and maturation index decreased, however, the titratable acidity increased with GA3 doses. The cluster and rachis length increased with application of GA3. The cluster width; cluster, rachis and berry mass and the soluble solids were not influenced by application of GA3. In ‘Sauvignon Blanc’ grapevine, GA3 reduced the percentage of clusters rotting and improved the cluster and rachis length characteristics and titrable acidity.
DOI: 10.6084/m9.figshare.9276266
title: CORPORATE GOVERNANCE AND CAPITAL STRUCTURE IN BRAZIL: STOCK, BONDS AND SUBSTITUTION

description: ABSTRACT Purpose: To study the Brazilian bond and stock markets for testing the stock market development theory of Demirgüc-Kunt and Maksimovic (1996). Originality/gap/relevance/implications: This paper tests the substitution hypothesis of stock market development, from debt to stocks, in a context of improved corporate governance, by analyzing the data with cointegration techniques. The findings show that the rejection of substitution hypothesis, as the bond market has a positive and significant association with stock market improvements. The findings also show that improving the quality of corporate governance could lead equity capital and borrower capital sources to be complementary and not substitutes, suggesting that Brazilian stock market reform has created a virtuous development cycle. Key methodological aspects: Positivist research using quantitative methodology. Data from a sample of 171 firms during 20 years, analyzed with cointegration. The null was a negative association between bond and stock markets. Summary of key results: Null rejection, non-consistent to theoretical framework. The results have shown a positive and significant association between stock and debt in an improved corporate governance context. Key considerations/conclusions: Improving the quality of corporate governance could lead equity capital and borrower capital sources to be complementary, and not substitutes, suggesting that Brazilian stock market reform has created a virtuous development cycle.
DOI: 10.6084/m9.figshare.9276266.v1
title: CORPORATE GOVERNANCE AND CAPITAL STRUCTURE IN BRAZIL: STOCK, BONDS AND SUBSTITUTION

description: ABSTRACT Purpose: To study the Brazilian bond and stock markets for testing the stock market development theory of Demirgüc-Kunt and Maksimovic (1996). Originality/gap/relevance/implications: This paper tests the substitution hypothesis of stock market development, from debt to stocks, in a context of improved corporate governance, by analyzing the data with cointegration techniques. The findings show that the rejection of substitution hypothesis, as the bond market has a positive and significant association with stock market improvements. The findings also show that improving the quality of corporate governance could lead equity capital and borrower capital sources to be complementary and not substitutes, suggesting that Brazilian stock market reform has created a virtuous development cycle. Key methodological aspects: Positivist research using quantitative methodology. Data from a sample of 171 firms during 20 years, analyzed with cointegration. The null was a negative association between bond and stock markets. Summary of key results: Null rejection, non-consistent to theoretical framework. The results have shown a positive and significant association between stock and debt in an improved corporate governance context. Key considerations/conclusions: Improving the quality of corporate governance could lead equity capital and borrower capital sources to be complementary, and not substitutes, suggesting that Brazilian stock market reform has created a virtuous development cycle.
DOI: 10.6084/m9.figshare.9276275.v1
title: Soil conservation management with cover crops: effects on critical energy levels, release and dispersion of aggregates

description: ABSTRACT The normalized dispersion index (NDI) and the b/a index are commonly used to express the stability of aggregates measured by ultrasound. However, few studies have used the critical energy (CE) extracted from modeling to explain the effects of soil use and management on soil aggregation. The objective of this study was to evaluate the influence of soil cover on the CE level required for dispersion of aggregates of a Typic Hapludalf. Soil samples collected from the 0.0-0.05 m depth were evaluated in five different managements with cover plants: perennial soybean (PS), peanuts (P), spontaneous vegetation (SV), black oat/forage turnip (BOFT), and black oat/hairy vetch (BOHV). Aggregates ? 2 mm of the treatments were exposed to ultrasonic irradiation during 0, 30, 60, 120 and 180 s. The specific applied energies were calculated based on sonification time and potency: 0, 745, 1490, 2980, and 4470 J·g–1. After each sonification, sand (2000-53 ?m), silt (53-2 ?m) and clay (&lt; 2 ?m) were quantified. The mass of aggregates of each size class was modeled as a function of the ultrasonic energy. The CE, the NDI and the b/a indexes were coefficients extracted from these models. Cover crops influenced the critical energy levels required for dispersion of aggregates of the Typic Hapludalf. However, our methodology did not prove management systems with intercrops of the cover crops, as black oats and vetch, contribute more effectively to the increase of soil aggregation.
DOI: 10.6084/m9.figshare.9276254
title: Market integration does not affect traditional ecological knowledge but contributes additional pressure on plant resources

description: ABSTRACT Market integration can affect the manner in which individuals learn about and use natural resources. The present study explores the influence of market integration on the traditional ecological knowledge (TEK) and use of natural resources in handicraft production among the Fulni-ô indigenous people of Northeast Brazil. We collect data from 67 artisans about their traditional and non-traditional handicrafts, which are mainly produced for external trade demand (our proxy for market integration). Data regarding the distribution of knowledge among different segments of the population, according to socioeconomic variables, and the comparison of plant biomass used for traditional and non-traditional handicrafts, reveals that integration does not affect the distribution of TEK but leads to a higher consumption of native plant resources, which can negatively affect the populations of the species used. The present findings indicate a future scenario of the replacement of TEK with knowledge that yields higher economic returns. The most experienced artisans have greater traditional ecological knowledge of traditional handicrafts and can play a fundamental role in maintaining traditional knowledge in the context of market integration. Finally, temporal evaluation studies in particular are needed to better understand changes in knowledge derived from market integration.
DOI: 10.6084/m9.figshare.9276251
title: Spatial-temporal variation in litterfall in seasonally dry tropical forests in Northeastern Brazil

description: Abstract The production of litterfall is essential for nutrient cycling in terrestrial ecosystems. From November 2009 to October 2011, analyzed the monthly litterfall production in two areas of Caatinga, a type of Seasonally Dry Tropical Forest located in the Cariri Paraibano, in the semiarid region of the Paraíba, Northeastern Brazil. One of the areas, Private Natural Heritage Reserve (RPPN) Fazenda Almas, is legally protected, and the other, Fazenda Moreiras, does not. The aims were to evaluate the effects of precipitation, evapotranspiration and vegetation structure on the temporal and spatial dynamics of litterfall production. Eight sampling points were randomly chosen at each site, and two 1 m2 collectors were installed 50 m apart from each other. The collected material was sorted, dried and weighed. Additionally, the characteristics (density, species richness, height and mean basal area) of the tree-shrub stratum in plots with a 10 m radius surrounding each collector. Total litterfall production was 4,500 kg ha-1 yr-1 for Fazenda Almas and 3,300 kg ha-1 yr-1 for Fazenda Moreiras; these values were within the expected range for Seasonally Dry Tropical Forests. The inter- and intra-annual variation in litterfall production was positively correlated with precipitation and evapotranspiration rates, and four months after the highest precipitation rates, there was a marked decrease in litterfall occurred during the dry season. Furthermore, the contributions of the material fractions were distinct with the leaf fraction representing for more than 60% of the litterfall, and the vegetation structure explained 75% of the variation in litterfall production. Therefore, climatic factors and vegetation structure affect the temporal and spatial dynamics of litterfall production and consequently influence nutrient dynamics in the semiarid region of Brazil.
DOI: 10.6084/m9.figshare.9276254.v1
title: Market integration does not affect traditional ecological knowledge but contributes additional pressure on plant resources

description: ABSTRACT Market integration can affect the manner in which individuals learn about and use natural resources. The present study explores the influence of market integration on the traditional ecological knowledge (TEK) and use of natural resources in handicraft production among the Fulni-ô indigenous people of Northeast Brazil. We collect data from 67 artisans about their traditional and non-traditional handicrafts, which are mainly produced for external trade demand (our proxy for market integration). Data regarding the distribution of knowledge among different segments of the population, according to socioeconomic variables, and the comparison of plant biomass used for traditional and non-traditional handicrafts, reveals that integration does not affect the distribution of TEK but leads to a higher consumption of native plant resources, which can negatively affect the populations of the species used. The present findings indicate a future scenario of the replacement of TEK with knowledge that yields higher economic returns. The most experienced artisans have greater traditional ecological knowledge of traditional handicrafts and can play a fundamental role in maintaining traditional knowledge in the context of market integration. Finally, temporal evaluation studies in particular are needed to better understand changes in knowledge derived from market integration.
DOI: 10.6084/m9.figshare.9276248
title: Isolation and characterization of hydrocarbon-degrading bacteria from gas station leaking-contaminated groundwater in the Southern Amazon, Brazil

description: Abstract Twenty-three hydrocarbon-degrading bacteria strains were isolated from gas station leaking-contaminated groundwater located in the Southern Amazon, Brazil. Based on hydrocarbon (diesel, hexadecane, benzene, toluene and xylene) degradation ability, two strains were selected for further study. The amplification and sequencing of the 16S rRNA gene showed that these two strains belonged to the genus Bacillus (Bacillus sp. L26 and Bacillus sp. L30). GC-MS analysis showed that strain L30 was the most effective in degrading n-alkane (C10-C27) from diesel after 7 days of cultivation in mineral medium. Both strains produced biosurfactants and showed emulsification activity, specially the strain L30. Alkane hydroxylase gene (group III), which is important for alkane biodegradation, was present in strains. As a result, this study indicated that these bacteria could have promising applications in hydrocarbon bioremediation.
DOI: 10.6084/m9.figshare.9276245
title: Fibrosis: a distinguishing feature in the pathology of neural leprosy

description: BACKGROUND Fibrosis in the peripheral nerve is the end stage of leprous neuropathy and the cause of the resulting permanent neural function impairments. Preventive measures to avoid this irreversible pathological state are a relief strategy for leprosy sufferers. OBJECTIVES The present study describes the frequency of fibrosis along with its characterisation and pathogenic development. METHODS Six-hundred-and-thirteen nerve samples were sorted from 278 neural leprosy (NL) and 335 non-leprosy neuropathy patients (ON). The total number of samples was histologically examined by routine staining methods (haematoxylin-eosin, Wade staining and Gomori’s trichrome) and fibrosis was evaluated via semi-quantitative estimation. FINDINGS Fibrosis was most frequent in the NL group (33% against 0.4% in ON) while fibrosis in association with endoneurial microfasciculation was found in 38 (41.3%) of the NL samples in the examination of semithin sections. Pericytic activation in the perivascular environment was confirmed to be the source of the fibroblasts and perineurial cells delimiting microfascicles. End-stage fibrosis in leprosy displays an arrangement of microfascicles devoid of neural components (i.e., Schwann cells and axons) lined by an intermediate phenotype of fibroblastic-perineurial cells filled with bundles of collagen fibres. MAIN CONCLUSIONS The present study underscores that fibrosis is frequently the severe end stage of neural leprosy NL pathogeny after analysing the notably distinct development of fibrosis within the neural environment.
DOI: 10.6084/m9.figshare.9276248.v1
title: Isolation and characterization of hydrocarbon-degrading bacteria from gas station leaking-contaminated groundwater in the Southern Amazon, Brazil

description: Abstract Twenty-three hydrocarbon-degrading bacteria strains were isolated from gas station leaking-contaminated groundwater located in the Southern Amazon, Brazil. Based on hydrocarbon (diesel, hexadecane, benzene, toluene and xylene) degradation ability, two strains were selected for further study. The amplification and sequencing of the 16S rRNA gene showed that these two strains belonged to the genus Bacillus (Bacillus sp. L26 and Bacillus sp. L30). GC-MS analysis showed that strain L30 was the most effective in degrading n-alkane (C10-C27) from diesel after 7 days of cultivation in mineral medium. Both strains produced biosurfactants and showed emulsification activity, specially the strain L30. Alkane hydroxylase gene (group III), which is important for alkane biodegradation, was present in strains. As a result, this study indicated that these bacteria could have promising applications in hydrocarbon bioremediation.
DOI: 10.6084/m9.figshare.9276251.v1
title: Spatial-temporal variation in litterfall in seasonally dry tropical forests in Northeastern Brazil

description: Abstract The production of litterfall is essential for nutrient cycling in terrestrial ecosystems. From November 2009 to October 2011, analyzed the monthly litterfall production in two areas of Caatinga, a type of Seasonally Dry Tropical Forest located in the Cariri Paraibano, in the semiarid region of the Paraíba, Northeastern Brazil. One of the areas, Private Natural Heritage Reserve (RPPN) Fazenda Almas, is legally protected, and the other, Fazenda Moreiras, does not. The aims were to evaluate the effects of precipitation, evapotranspiration and vegetation structure on the temporal and spatial dynamics of litterfall production. Eight sampling points were randomly chosen at each site, and two 1 m2 collectors were installed 50 m apart from each other. The collected material was sorted, dried and weighed. Additionally, the characteristics (density, species richness, height and mean basal area) of the tree-shrub stratum in plots with a 10 m radius surrounding each collector. Total litterfall production was 4,500 kg ha-1 yr-1 for Fazenda Almas and 3,300 kg ha-1 yr-1 for Fazenda Moreiras; these values were within the expected range for Seasonally Dry Tropical Forests. The inter- and intra-annual variation in litterfall production was positively correlated with precipitation and evapotranspiration rates, and four months after the highest precipitation rates, there was a marked decrease in litterfall occurred during the dry season. Furthermore, the contributions of the material fractions were distinct with the leaf fraction representing for more than 60% of the litterfall, and the vegetation structure explained 75% of the variation in litterfall production. Therefore, climatic factors and vegetation structure affect the temporal and spatial dynamics of litterfall production and consequently influence nutrient dynamics in the semiarid region of Brazil.