cometadata/datacite-titles-descriptions-related-identifiers huggingface dataset:
DOI: 10.6084/m9.figshare.5671267.v1
title: Evaluation of the physicochemical properties of silicone- and epoxy resin-based root canal sealers

description: Abstract To assess the physicochemical properties of AH Plus, GuttaFlow 2, GuttaFlow BioSeal, and MM Seal, five samples of each root canal sealer were evaluated to determine their setting time (ST), dimensional change (DC), solubility (SL), flow (FL), and radiopacity (RD) according to American National Standards Institute/American Dental Association (ANSI/ADA) Specification 57. The distilled and deionized water obtained from the SL test were subjected to atomic absorption spectrometry to observe the presence of Ca2+, K+, and Na+ ions. Statistical analysis was performed by using one-way ANOVA and Tukey–Kramer tests (p &lt; 0.05). The following results were obtained: ST (min) (AH Plus 463.6 ± 13.22; GuttaFlow 2 24.35 ± 2.78; GuttaFlow Bioseal 17.4 ± 0.55; MM Seal 47.60 ± 4.39), DC (%) (AH Plus 0.06 ± 0.12; GuttaFlow 2 −26.06 ± 1.24; GuttaFlow Bioseal 2.10 ± 1.47; MM Seal 8.47 ± 2.41), SL (%) (AH Plus 0.41 ± 0.21; GuttaFlow 2 5.13 ± 4.11; GuttaFlow Bioseal 3.03 ± 1.05; MM Seal 0.94 ± 0.17), FL (mm) (AH Plus 36.42 ± 0.40; GuttaFlow 2 36.44 ± 0.05; GuttaFlow Bioseal 35.4 ± 0.03; MM Seal 52.75 ± 0.60), and RD (mmAl) (AH Plus 7.52 ± 1.59; GuttaFlow 2 6.85 ± 0.14; GuttaFlow Bioseal 7.02 ± 0.18; MM Seal 3.32 ± 0.90). ST, DC, SL, FL, and RD showed statistical differences among the root canal sealers (p &lt; 0.05). As AH Plus showed the lowest DC and SL values (p &lt; 0.05), the findings indicate that this sample is the only sealer conforming to ANSI/ADA standards.
DOI: 10.6084/m9.figshare.5671249
title: Hydroponic cultivation of Physalis angulata L.: growth and production under nitrogen doses1

description: ABSTRACT The Physalis angulata L. species has attracted interest due to the production of compounds with pharmacological activity and its potential for fruiticulture. Given that it is a fast-growing and highly productive species, determining the most adequate nitrogen (N) doses could contribute to higher crop yields. This study aimed at assessing the influence of N concentrations, in a hydroponic system, on the growth and production of P. angulata, as well as determining the critical N level in leaves. The experiment was conducted in individual pots with nutrient solutions, applying a completely randomized design and twelve replications, using five N doses (0 mg L-1, 56 mg L-1, 112 mg L-1, 168 mg L-1 and 224 mg L-1). Growth and production indices, amount of total N on leaves and stems and critical N levels were assessed. The increase of N doses in the nutrient solution influenced plant growth and fruit production, as well as the accumulation of total N in the leaves and stems. Based on the maximum economic yield, a dose of 162 mg L-1 of N is recommended for hydroponics, which provided a fruit yield of 7.27 g m-2 and critical total N level in leaves of 51.98 g kg-1.
DOI: 10.6084/m9.figshare.5671249.v1
title: Hydroponic cultivation of Physalis angulata L.: growth and production under nitrogen doses1

description: ABSTRACT The Physalis angulata L. species has attracted interest due to the production of compounds with pharmacological activity and its potential for fruiticulture. Given that it is a fast-growing and highly productive species, determining the most adequate nitrogen (N) doses could contribute to higher crop yields. This study aimed at assessing the influence of N concentrations, in a hydroponic system, on the growth and production of P. angulata, as well as determining the critical N level in leaves. The experiment was conducted in individual pots with nutrient solutions, applying a completely randomized design and twelve replications, using five N doses (0 mg L-1, 56 mg L-1, 112 mg L-1, 168 mg L-1 and 224 mg L-1). Growth and production indices, amount of total N on leaves and stems and critical N levels were assessed. The increase of N doses in the nutrient solution influenced plant growth and fruit production, as well as the accumulation of total N in the leaves and stems. Based on the maximum economic yield, a dose of 162 mg L-1 of N is recommended for hydroponics, which provided a fruit yield of 7.27 g m-2 and critical total N level in leaves of 51.98 g kg-1.
DOI: 10.6084/m9.figshare.5671246
title: Performance of flood-irrigated rice as affected by residual rice straw1

description: ABSTRACT Rice is an economically important and widely consumed cereal that achieves high yields under flood-irrigated cultivation. However, the amount of residual straw from the previous year may influence its growth and yield. This study evaluated the performance of flood-irrigated rice as affected by residual rice straw, in a greenhouse. A completely randomized design, in a 5 x 4 x 2 factorial scheme, with four replications, was used. Treatments were obtained from a combination of five rice straw amounts (0 t ha-1, 5 t ha-1, 10 t ha-1, 20 t ha-1 and 40 t ha-1), four application times (3, 2, 1 and 0 months before sowing) and two straw application methods (on the surface and incorporated into the soil). The number of panicles and shoot dry mass do not increase when residual straw remains on the soil surface. When the straw is incorporated into the soil on the sowing day, the number of panicles and the shoot dry mass increased by 20 % and 14 %, respectively, if compared to when it was added three months before. The addition of residual rice straw on the surface or incorporated into the soil resulted in a higher yield for flood-irrigated rice grains, when compared to the absence of straw. At 40 t ha-1 of residual rice straw, added at three months before sowing, there was a higher mass yield of rice grains, if compared to the lower amounts of straw.
DOI: 10.6084/m9.figshare.5671246.v1
title: Performance of flood-irrigated rice as affected by residual rice straw1

description: ABSTRACT Rice is an economically important and widely consumed cereal that achieves high yields under flood-irrigated cultivation. However, the amount of residual straw from the previous year may influence its growth and yield. This study evaluated the performance of flood-irrigated rice as affected by residual rice straw, in a greenhouse. A completely randomized design, in a 5 x 4 x 2 factorial scheme, with four replications, was used. Treatments were obtained from a combination of five rice straw amounts (0 t ha-1, 5 t ha-1, 10 t ha-1, 20 t ha-1 and 40 t ha-1), four application times (3, 2, 1 and 0 months before sowing) and two straw application methods (on the surface and incorporated into the soil). The number of panicles and shoot dry mass do not increase when residual straw remains on the soil surface. When the straw is incorporated into the soil on the sowing day, the number of panicles and the shoot dry mass increased by 20 % and 14 %, respectively, if compared to when it was added three months before. The addition of residual rice straw on the surface or incorporated into the soil resulted in a higher yield for flood-irrigated rice grains, when compared to the absence of straw. At 40 t ha-1 of residual rice straw, added at three months before sowing, there was a higher mass yield of rice grains, if compared to the lower amounts of straw.
DOI: 10.6084/m9.figshare.5671240
title: EUCALYPTUS LOGS DRYING AT HIGH TEMPERATURES

description: ABSTRACT The objective of this work was to evaluate the drying speed of Eucalyptus urophylla logs in high temperatures and the influence of the presence or absence of bark and also the diameter of the log in the drying rate. Eucalyptus logs 60 cm long were divided into three diameter classes: 8-12 cm; 12,1-16 cm and 16,1-20 cm. The logs were dried in a heater with forced air circulation, in the presence or absence of bark in five temperatures: 50, 75, 100, 125 and 150ºC. The mass and the initial moisture were determined from each log and the water loss was kept up with periodic weightings, closing the drying process when the logs reached 20% moisture. The drying rate of the logs was calculated using the ratio between the total loss of moisture and the time in hours in order to reach the established moisture. It was concluded that the increase in temperature promotes the raise of the drying ratio, as being higher for smaller logs in relation to bigger ones and in addition to this, the bark effect was not significant in the drying of eucalyptus logs above 100ºC. It was also concluded that the best conditions for the operation of artificial dryers for Eucalyptus logs containing bark and separated in diameter classes would be at 125ºC.
DOI: 10.6084/m9.figshare.5671240.v1
title: EUCALYPTUS LOGS DRYING AT HIGH TEMPERATURES

description: ABSTRACT The objective of this work was to evaluate the drying speed of Eucalyptus urophylla logs in high temperatures and the influence of the presence or absence of bark and also the diameter of the log in the drying rate. Eucalyptus logs 60 cm long were divided into three diameter classes: 8-12 cm; 12,1-16 cm and 16,1-20 cm. The logs were dried in a heater with forced air circulation, in the presence or absence of bark in five temperatures: 50, 75, 100, 125 and 150ºC. The mass and the initial moisture were determined from each log and the water loss was kept up with periodic weightings, closing the drying process when the logs reached 20% moisture. The drying rate of the logs was calculated using the ratio between the total loss of moisture and the time in hours in order to reach the established moisture. It was concluded that the increase in temperature promotes the raise of the drying ratio, as being higher for smaller logs in relation to bigger ones and in addition to this, the bark effect was not significant in the drying of eucalyptus logs above 100ºC. It was also concluded that the best conditions for the operation of artificial dryers for Eucalyptus logs containing bark and separated in diameter classes would be at 125ºC.
DOI: 10.6084/m9.figshare.5671234
title: Methodology for designing lateral lines with microtubes operated under variable inlet pressure

description: ABSTRACT Design of lateral lines consisting of microtubes enables to optimize water distribution uniformity. In addition, there must exist a range of pressures at the lateral line inlet in which the water distribution uniformity remains acceptable. Thus, such emitters are interesting for use in micro-irrigation systems supplied by alternative power sources, in which temporal variability in the electrical power supplied to the pumping systems normally occurs. This study presents a methodology for designing lateral lines with microtubes operated under varying pressure, using the step-by-step method in order to establish the recommended range of lateral line inlet pressures. The proposed methodology was validated over three replicates by testing maximum, minimum and optimum pressures. Deviation between estimated and observed values of flow rate was lower than 6%, indicating a satisfactory accuracy. Distribution uniformity of the system was higher than 95% under all pressures within the estimated range of values. Lateral lines can operate within a wide range of operating pressures and even so satisfactory results of distribution uniformity are obtained.
DOI: 10.6084/m9.figshare.5671234.v1
title: Methodology for designing lateral lines with microtubes operated under variable inlet pressure

description: ABSTRACT Design of lateral lines consisting of microtubes enables to optimize water distribution uniformity. In addition, there must exist a range of pressures at the lateral line inlet in which the water distribution uniformity remains acceptable. Thus, such emitters are interesting for use in micro-irrigation systems supplied by alternative power sources, in which temporal variability in the electrical power supplied to the pumping systems normally occurs. This study presents a methodology for designing lateral lines with microtubes operated under varying pressure, using the step-by-step method in order to establish the recommended range of lateral line inlet pressures. The proposed methodology was validated over three replicates by testing maximum, minimum and optimum pressures. Deviation between estimated and observed values of flow rate was lower than 6%, indicating a satisfactory accuracy. Distribution uniformity of the system was higher than 95% under all pressures within the estimated range of values. Lateral lines can operate within a wide range of operating pressures and even so satisfactory results of distribution uniformity are obtained.
DOI: 10.6084/m9.figshare.5671231
title: Deterioration rates of brazilwood seeds (Caesalpinia echinata Lam.) under high temperatures

description: ABSTRACT Caesalpinia echinata seeds deteriorate in less than three months at ambient temperature, although they can remain viable for up to five years when kept under freezing temperatures. We studied the deterioration of brazilwood seeds when submitted to different conditions of temperature and humidity aiming to check the applicability of mathematical models for predicting loss of viability of those seeds. The results showed that the high temperatures preconized for the rapid deterioration and simulation of storability produced an irregular behavior, suggesting that the deteriorative metabolism of these seeds may not correspond to the metabolism during the natural storage. Applying the equations, seeds with 8% water content stored at 7 ºC could be stored for five years, while the literature shows that these seeds would not tolerate more than a year. On the other hand, the prediction of storage with 10% of water content at -18 ºC would be, by these equations, 128 years, while the literature shows that seeds under these conditions would lose viability in less than ten years. The results showed that the current models might present restrictions on their application, depending on the species and conditions.
DOI: 10.6084/m9.figshare.5671231.v1
title: Deterioration rates of brazilwood seeds (Caesalpinia echinata Lam.) under high temperatures

description: ABSTRACT Caesalpinia echinata seeds deteriorate in less than three months at ambient temperature, although they can remain viable for up to five years when kept under freezing temperatures. We studied the deterioration of brazilwood seeds when submitted to different conditions of temperature and humidity aiming to check the applicability of mathematical models for predicting loss of viability of those seeds. The results showed that the high temperatures preconized for the rapid deterioration and simulation of storability produced an irregular behavior, suggesting that the deteriorative metabolism of these seeds may not correspond to the metabolism during the natural storage. Applying the equations, seeds with 8% water content stored at 7 ºC could be stored for five years, while the literature shows that these seeds would not tolerate more than a year. On the other hand, the prediction of storage with 10% of water content at -18 ºC would be, by these equations, 128 years, while the literature shows that seeds under these conditions would lose viability in less than ten years. The results showed that the current models might present restrictions on their application, depending on the species and conditions.
DOI: 10.6084/m9.figshare.5671189
title: Tutors’ Perception of their Assessment by Students of a Medical Course

description: ABSTRACT Among the active pedagogical methodologies, Problem-Based Learning provides new roles to the agents of the teaching-learning processes. The teacher passes from the role of single knowledge holder to facilitator of the learning process. On the other hand the student’s role also changes from passive subject to active participant in this knowledge construction. This study aimed at analyzing the meaning given by tutors to assessments made by medicine students at Montes Claros State University on their professional performance. It is a qualitative, descriptive and exploratory study, the subjects of which were 11 tutors of the Content Specific Module of first and fourth year students in the second semester of 2009. We used structured interviews to collect data, the results of which were analyzed and interpreted according to thematic content analysis. The tutors were mostly female who held a specialization qualification and master’s degree; the predominant working week was 40 hours. The following thematic categories were derived from the interviews: aspects that influenced the decision to work as a tutor: invitations from and needs of the institution; tutor training: only some teachers received training, some became tutors through observing other tutors at work; awareness of the student assessment at the end of each module: the student assessment is not performed in a committed manner; teachers and managers do not engage in the results; and finally the categories of how the tutors conceive the assessment and perceive it via the Intranet: it was observed that all the subjects are aware of the importance of such a process, but some teachers are not interested in the student assessments. It is expected that the results will contribute to improving teachers’ view of their role in building and organizing the curriculum and, consequently, in the training of new medical professionals, as set out in the Pedagogical Political Project for this course.
DOI: 10.6084/m9.figshare.5671189.v1
title: Tutors’ Perception of their Assessment by Students of a Medical Course

description: ABSTRACT Among the active pedagogical methodologies, Problem-Based Learning provides new roles to the agents of the teaching-learning processes. The teacher passes from the role of single knowledge holder to facilitator of the learning process. On the other hand the student’s role also changes from passive subject to active participant in this knowledge construction. This study aimed at analyzing the meaning given by tutors to assessments made by medicine students at Montes Claros State University on their professional performance. It is a qualitative, descriptive and exploratory study, the subjects of which were 11 tutors of the Content Specific Module of first and fourth year students in the second semester of 2009. We used structured interviews to collect data, the results of which were analyzed and interpreted according to thematic content analysis. The tutors were mostly female who held a specialization qualification and master’s degree; the predominant working week was 40 hours. The following thematic categories were derived from the interviews: aspects that influenced the decision to work as a tutor: invitations from and needs of the institution; tutor training: only some teachers received training, some became tutors through observing other tutors at work; awareness of the student assessment at the end of each module: the student assessment is not performed in a committed manner; teachers and managers do not engage in the results; and finally the categories of how the tutors conceive the assessment and perceive it via the Intranet: it was observed that all the subjects are aware of the importance of such a process, but some teachers are not interested in the student assessments. It is expected that the results will contribute to improving teachers’ view of their role in building and organizing the curriculum and, consequently, in the training of new medical professionals, as set out in the Pedagogical Political Project for this course.
DOI: 10.6084/m9.figshare.12895742
title: 上传数据.xlsx

description: Nitrogen is a key factor influencing synergism among leaf senescence, carbon and nitrogen remobilization, and grain growth in maize
DOI: 10.6084/m9.figshare.12895742.v1
title: 上传数据.xlsx

description: Nitrogen is a key factor influencing synergism among leaf senescence, carbon and nitrogen remobilization, and grain growth in maize
DOI: 10.6084/m9.figshare.5671174
title: The letters of a Revolution: the implantation of the Republic in Portugal on October 5, 1910

description: Abstract The proclamation of the Republic in Portugal on October 5th 1910 closed a process that began at the end of the XIXth century, especially in its later years. The period is characterized by a condensation of a multifaceted context of crisis in which were inscribed the collapse of the constitutional Monarchy and the opening of an inexorable path leading to the Republic. This paper analyses the preparation of the revolution and the proclamation of the new regime in Portugal.
DOI: 10.6084/m9.figshare.5671174.v1
title: The letters of a Revolution: the implantation of the Republic in Portugal on October 5, 1910

description: Abstract The proclamation of the Republic in Portugal on October 5th 1910 closed a process that began at the end of the XIXth century, especially in its later years. The period is characterized by a condensation of a multifaceted context of crisis in which were inscribed the collapse of the constitutional Monarchy and the opening of an inexorable path leading to the Republic. This paper analyses the preparation of the revolution and the proclamation of the new regime in Portugal.
DOI: 10.6084/m9.figshare.5671162
title: Soil chemical properties and nutrients in maize fertilized with urban waste compost1

description: ABSTRACT Urban waste compost has a potential to be used as an organic fertilizer in agriculture, but field studies are required to define the recommendable rates for crops. This study aimed at evaluating the effect of fertilization with urban waste compost on the soil chemical properties, yield, nutrient and heavy metal contents, in maize leaves and grains. The field experiment was carried out in a randomized complete block design, with seven treatments and four replications. The treatments consisted of six urban waste compost doses (0 Mg ha-1, 5 Mg ha-1, 10 Mg ha-1, 20 Mg ha-1, 30 Mg ha-1 and 40 Mg ha-1), applied in the planting furrow, plus an additional control treatment, with NPK mineral fertilization and no waste compost application. Fertilization with up to 40 Mg ha-1 of urban waste compost improves soil fertility. Fertilization with urban waste compost increases grain yield and the N, P and K contents in leaf tissue and maize grains, without inducing plant contamination with heavy metals. The application of 30 Mg ha-1 of urban waste compost can replace mineral fertilization in maize cultivation.
DOI: 10.6084/m9.figshare.5671162.v1
title: Soil chemical properties and nutrients in maize fertilized with urban waste compost1

description: ABSTRACT Urban waste compost has a potential to be used as an organic fertilizer in agriculture, but field studies are required to define the recommendable rates for crops. This study aimed at evaluating the effect of fertilization with urban waste compost on the soil chemical properties, yield, nutrient and heavy metal contents, in maize leaves and grains. The field experiment was carried out in a randomized complete block design, with seven treatments and four replications. The treatments consisted of six urban waste compost doses (0 Mg ha-1, 5 Mg ha-1, 10 Mg ha-1, 20 Mg ha-1, 30 Mg ha-1 and 40 Mg ha-1), applied in the planting furrow, plus an additional control treatment, with NPK mineral fertilization and no waste compost application. Fertilization with up to 40 Mg ha-1 of urban waste compost improves soil fertility. Fertilization with urban waste compost increases grain yield and the N, P and K contents in leaf tissue and maize grains, without inducing plant contamination with heavy metals. The application of 30 Mg ha-1 of urban waste compost can replace mineral fertilization in maize cultivation.
DOI: 10.6084/m9.figshare.5671156
title: TGA

description: Thermogravimetric analysis<br>