cometadata/datacite-titles-descriptions-related-identifiers huggingface dataset:
DOI: 10.6084/m9.figshare.9871331.v1
title: Red mud treatment with CO2 and acetic acid for applications on Fenton-like and Photocatalysis systems

description: ABSTRACT Red mud (LV_Nat) as a raw material was used for the preparation of two modified material with 1% (LV_1%) and 5% (LV_5%) of acetic acid. LV_Nat, LV_1% and LV_5% were characterized (mineralogical composition, specific BET area, scanning electron microscopy, X-ray diffraction, X-ray Absorption Near Edge Structure, Infrared (FTIR) and Mössbauer spectroscopy) and used in catalytic tests. It was observed that the treatment enhanced LV’s surface area about four times. Through oxidative tests carried out with methylene blue (MB), it was found that the most suitable system for both materials was the Photo-Fenton system, with 100% degraded after 3 h of reaction for LV_5% and after 4 h for LV_1%. Acetic acid behaved as co-catalyst being very effective, presenting results observed with the use of organic acid equimolar to H2O2. The application of modified red mud in oxidative catalytic processes is an attractive alternative, which can directly contribute to the use of organic waste.
DOI: 10.6084/m9.figshare.9871328.v1
title: Effects of the variation of the concentration of aqueous polymer solution based on PVP in the quenching of AISI 4140 steel

description: ABSTRACT Quenching is a heat treatment whose main objective is to increase the hardness and mechanical strength of the steels by their microstructural transformation. The process is based on increasing the temperature of the material to austenitization, followed by cooling by immersion in a fluid, which needs to be fast enough to avoid diffusion of the carbon, aiming at the formation of a predominantly martensitic microstructure. Aqueous polymer solutions, which are blends of water with polymer, have been used now for this procedure. The concentration of these solutions is a fundamental factor for the heat exchange capacity of the fluids and, consequently, the variation of this factor promotes the development of different mechanical properties in the quenched material. Thus, the present work consisted in the evaluation of the properties of quenched AISI 4140 steel in aqueous polymer solutions based on polyvinylpyrrolidone (PVP) at concentrations of 10, 15, 20 and 25%. For this, the characterization of the steel was made by the microstructural evaluation, microhardness and X-ray diffraction. Through these evaluations, it has been demonstrated that the heat withdrawal capacity of the material is being minimized according to the addition of PVP to the solution. As a result, the decrease in the thermal exchange determined a lower martensite formation and a decrease in the microhardness profile of the samples, although no phase variation was observed in all the process situations.
DOI: 10.6084/m9.figshare.9871334.v1
title: Adding value to polystyrene waste by chemically transforming it into sulfonated polystyrene

description: ABSTRACT Polystyrene (PS), one of the most used polymers in everyday life, has a low recycling rate due to its inexpensive virgin resin. In order to make polystyrene waste (WPS) recycling advantageous, it is possible to change it chemically, introducing heteroatoms in the polymer chain thus transforming the waste into a material with more added value. In this work, sulfonation reactions of polystyrene waste (disposable cups and expanded polystyrene -EPS) with different degrees of sulfonation were carried out by homogeneous sulfonation using acetylsulfate as a sulfonating agent, originating polystyrene sulfonate (PSS). The characterization of the products was done using Fourier Transformed Infrared Spectroscopy (FTIR), solubility tests and inductively coupled plasma optical emission spectroscopy (ICP-OES). Infrared spectroscopy revealed that the reaction was efficient and all the starting materials tested were successfully sulfonated and transformed into PSS. There was no distinction between the residues tested, revealing that it's possible to carry the reaction without sorting the waste. EPS was chosen as the substrate for further reactions varying the degree of sulfonation. Solubility and ICP-OES tests have shown that, by changing the synthesis conditions, it is possible to achieve different degrees of products sulfonation. As a result of the studied reactions it was found that varying the degree of sufonation it is possible to use polystyrene residues to produce PSS for different applications.
DOI: 10.6084/m9.figshare.9871316
title: Association of dietary patterns and degree of food processing with feelings of depression in pregnancy

description: Abstract Objectives: to investigate the relationship of dietary patterns and degree of food processing with feelings of depression in pregnancy. Methods: cross-sectional study conducted with 784 adult pregnant women in Ribeirão Preto, SP, between 2011 and 2012. Feelings of depression were obtained through a structured questionnaire. Two 24-hour dietary recalls were obtained (24th-39th weeks of gestation) and adjusted through the Multiple Source Method. Four dietary patterns were determined: “Brazilian traditional”,“snacks”, “coffee”, and “healthy”. Adjusted logistic regression models were used to assess the relationship ofthe tertiles of dietary patterns and energy contribution (% E) of foods according to the degree of industrial processing with feelings of depression (always/most of the time vs. sometimes/never). Results: 12% of the women reported feelings of depression during the pregnancy. Women with greater adherence to “Brazilian traditional”[OR= 0.54 (CI95%= 0.30-0.97)] and “healthy” patterns [0.53 (0.30-0.94)] and with higher % E from minimally processed foods [0.51 (0.28-0.93)] presented a lower chance of feelings of depression. A higher % E from ultra-processed foods [2.39 (1.29-4.41)] was directly associated with the outcome. No associations with the other patterns were found. Conclusions: greater adherence to the“Brazilian traditional” and “healthy” dietary patterns was inversely associated with feelings of depression during pregnancy, possibly mediated by the degree of industrial processing of the foods.
DOI: 10.6084/m9.figshare.9871319
title: Improvement in light utilization and shoot growth in Hymenaea stigonocarpa under high CO 2 concentration attenuates simulated leaf herbivory effects

description: ABSTRACT This study evaluated the photochemical responses of photosystem II and growth of Hymenaea stigonocarpa under CO2-enriched conditions with exposure to simulated herbivory events. After herbivory simulation in two distinct parts of the stem of plants (apex and base), chlorophyll a fluorescence, chlorophyll index, growth, extrafloral nectary density, leaf mineral nutrition, and biomass production were evaluated. Plants of H. stigonocarpa grown under high [CO2] after simulated herbivory in the apical part of the stem had higher electron transport rate, effective quantum yield of photosystem II, and chlorophyll contents. However, simulated herbivory in the basal portion of plants grown under high [CO2] increased plant height, branch and root length, leaf number, leaf area, node number, and leaf expansion rate. In conclusion simulated herbivory at the basal portion and high [CO2] induce positive responses in H. stigonocarpa, leading to the allocation of biomass to vegetative parts related to the capture of resources such as water and light. Apical leaves could compensate for the elimination of part of their leaf blades by increasing their photosynthetic yield. Thus, the increase of [CO2] attenuated the adverse effects of leaf removal on H. stigonocarpa plants by inducing photosynthetic improvement and growth after the loss of leaf tissue.
DOI: 10.6084/m9.figshare.9871322.v1
title: Influence of thermal rectification and furfurylation treatments on technological properties of a conifer

description: ABSTRACT The Pinus elliottii Engelm. has a wide range of applications, but it has undesirable characteristics that can be attenuated with the adoption of thermal rectification and furfurylation treatments. Thus, this work analyzed the influence of two treatments of modification, furfurilatyon and thermal rectification, in technological properties of Pinus elliottii Engelm. wood. For this, samples with dimensions of 15 x 15 x 250 mm (tangential, radial and longitudinal) were prepared, distributed equally among 5 treatments: control, furfurylation with 25% loading of furfuryl alcohol (T F25 %) and thermortification at different temperatures (T 180 ° C, T 200 ° C and T 220 ° C). It were evaluated the mass loss (PM) according to ASTM D 2017 (2005), specific gravity at 12% moisture content (ρ12%), elastic modulus (MOE) and rupture (MOR) by performing the static bending test in accordance with ASTM D 143 (2014), and wood color variation in accordance with the CIE-L*a*b* system recommendations. It was verified that the treatment with furfurol caused: significant increases in the mass, ρ12%, MOR, and caused the wood darkening, not significantly affecting the MOE, in 5% probability of error. The thermal rectification treatments significantly affected the mass loss, however the highest difference was observed in the T 220 ° C treatment, which caused a significant reduction on MOR in relation to the control group, highlighting that such treatment left the wood with coloration similar to that obtained by wood treated with furfurol. It's concluded that both treatments caused darkening of Pinus elliottii wood, thus adding aesthetic value, being that the furfurol treatment with a 25% load caused an improvement on technological properties of wood. In spite of the thermal rectification treatments increased the MOE, they generated significant mass loss, mainly in the more aggressive treatments, thus compromising possible uses of the wood with structural purpose.
DOI: 10.6084/m9.figshare.9871325.v1
title: Study of replacement of nylon by polypropylene composite and glass fiber

description: ABSTRACT Parts made from high performance polymers have been replaced by similar materials, produced with a polypropylene (PP) composition, with a lower cost. One of the most commonly used compositions is made by the the joining of polypropylene with fibers, resulting in a new product with different characteristics from those of its constituents. This type of joint is called composite. The objective of this study is to evaluate the behavior of the fiberglass polypropylene composite for the replacement of the housing material of a filter element which is currently manufactured with a nylon and glass fiber composite in the proportion of 30% by weight. Test specimens was injected by using PP pure and as well as with 15%, 20% and 30% fiberglass loads, for behavior analysis through tensile test, flexural strength, impact strength, hardness, flow index and determination of contraction rate. After the injection in the composite with best behavior, PP 30% fiberglass, the filter element housing was subjected practical tests.
DOI: 10.6084/m9.figshare.9871316.v1
title: Association of dietary patterns and degree of food processing with feelings of depression in pregnancy

description: Abstract Objectives: to investigate the relationship of dietary patterns and degree of food processing with feelings of depression in pregnancy. Methods: cross-sectional study conducted with 784 adult pregnant women in Ribeirão Preto, SP, between 2011 and 2012. Feelings of depression were obtained through a structured questionnaire. Two 24-hour dietary recalls were obtained (24th-39th weeks of gestation) and adjusted through the Multiple Source Method. Four dietary patterns were determined: “Brazilian traditional”,“snacks”, “coffee”, and “healthy”. Adjusted logistic regression models were used to assess the relationship ofthe tertiles of dietary patterns and energy contribution (% E) of foods according to the degree of industrial processing with feelings of depression (always/most of the time vs. sometimes/never). Results: 12% of the women reported feelings of depression during the pregnancy. Women with greater adherence to “Brazilian traditional”[OR= 0.54 (CI95%= 0.30-0.97)] and “healthy” patterns [0.53 (0.30-0.94)] and with higher % E from minimally processed foods [0.51 (0.28-0.93)] presented a lower chance of feelings of depression. A higher % E from ultra-processed foods [2.39 (1.29-4.41)] was directly associated with the outcome. No associations with the other patterns were found. Conclusions: greater adherence to the“Brazilian traditional” and “healthy” dietary patterns was inversely associated with feelings of depression during pregnancy, possibly mediated by the degree of industrial processing of the foods.
DOI: 10.6084/m9.figshare.9871319.v1
title: Improvement in light utilization and shoot growth in Hymenaea stigonocarpa under high CO 2 concentration attenuates simulated leaf herbivory effects

description: ABSTRACT This study evaluated the photochemical responses of photosystem II and growth of Hymenaea stigonocarpa under CO2-enriched conditions with exposure to simulated herbivory events. After herbivory simulation in two distinct parts of the stem of plants (apex and base), chlorophyll a fluorescence, chlorophyll index, growth, extrafloral nectary density, leaf mineral nutrition, and biomass production were evaluated. Plants of H. stigonocarpa grown under high [CO2] after simulated herbivory in the apical part of the stem had higher electron transport rate, effective quantum yield of photosystem II, and chlorophyll contents. However, simulated herbivory in the basal portion of plants grown under high [CO2] increased plant height, branch and root length, leaf number, leaf area, node number, and leaf expansion rate. In conclusion simulated herbivory at the basal portion and high [CO2] induce positive responses in H. stigonocarpa, leading to the allocation of biomass to vegetative parts related to the capture of resources such as water and light. Apical leaves could compensate for the elimination of part of their leaf blades by increasing their photosynthetic yield. Thus, the increase of [CO2] attenuated the adverse effects of leaf removal on H. stigonocarpa plants by inducing photosynthetic improvement and growth after the loss of leaf tissue.
DOI: 10.6084/m9.figshare.9871307
title: Are we close to knowing the plant diversity of the Amazon?

description: Abstract: Amazonia is often cited as having the most diverse flora on the planet. However, the total number of species of higher plants in the region has been largely a matter of guesswork. Some recent publications have estimated the total number of species present, which indicate a lower overall diversity than was estimated in the past. However, analysis of the sampling density across the region, and data from various sources suggest that there may be reason why the recent figures may be considerable underestimates. I believe that much more investment in extensive collecting of quality plant specimens is needed to encounter the very large number of rare and local species that might never have been collected. Unfortunately the tendencies of investment in botany, in terms of geography and types of project, suggest that we will probably not be able to accurately assess the real diversity of the region.
DOI: 10.6084/m9.figshare.9871301
title: Accuracy of mobility tests for screening the risk of falls in patients with mild cognitive impairment and alzheimer’s disease

description: ABSTRACT Identifying gait and balance disorders in the earlier stages of Alzheimer’s disease (AD) and Mild Cognitive Impairment (MCI) could reduce or prevent falls in older adults. This cross-sectional study aimed to determine which mobility tests best discriminate the risk of falls in MCI and mild AD. Functional mobility was assessed by the timed up and go test (TUG) and 10-meter walk test (10MWT). A calendar of falls was produced, with follow-up via telephone calls during 6 months. For the MCI Group (n=38), time spent on the 10MWT was the best variable for discriminating fallers, with a cut-off point of 10.69 seconds associated with the highest accuracy (76.3%). In the AD Group (n=37), 10MWT cadence was the best variable for discriminating fallers, with a cut-off point of 101.39 steps per minute associated with an accuracy of 81.1%. As a conclusion, 10MWT time and cadence were the most accurate variables for screening the risk of falls in MCI and mild AD, respectively. The 10MWT is a functional, simple and easy test and it should be widely used in clinical practice.
DOI: 10.6084/m9.figshare.9871307.v1
title: Are we close to knowing the plant diversity of the Amazon?

description: Abstract: Amazonia is often cited as having the most diverse flora on the planet. However, the total number of species of higher plants in the region has been largely a matter of guesswork. Some recent publications have estimated the total number of species present, which indicate a lower overall diversity than was estimated in the past. However, analysis of the sampling density across the region, and data from various sources suggest that there may be reason why the recent figures may be considerable underestimates. I believe that much more investment in extensive collecting of quality plant specimens is needed to encounter the very large number of rare and local species that might never have been collected. Unfortunately the tendencies of investment in botany, in terms of geography and types of project, suggest that we will probably not be able to accurately assess the real diversity of the region.
DOI: 10.6084/m9.figshare.9871295
title: Antifibrotic effects of total or partial application of amniotic membrane in hepatic fibrosis

description: Abstract: Liver fibrosis is the final common pathway of chronic liver diseases, having cirrhosis as a possible progression, which has liver transplantation as the only effective treatment. Human amniotic membrane represents a potential strategy as a therapy for liver fibrosis, due to its anti-inflammatory, anti-fibrotic and immunomodulatory properties. The aim of this study was to evaluate amniotic membrane effects as a treatment for hepatic fibrosis induced in rats by bile duct ligation (BDL), verifying alterations between two different forms of amniotic membrane application, around all the lobes of the liver and around only one lobe of the liver. Two weeks after inducing fibrosis, an amniotic membrane fragment was applied to the surface of the liver, covering it either totally or partially. Four weeks later, the animals were euthanized and liver samples were collected. Histopathological and quantitative analyses demonstrated fibrosis severity decrease and an extremely significant reduction in the deposition of collagen in the groups treated with amniotic membrane, particularly when the amniotic membrane was applied in only one liver lobe. It is concluded that the amniotic membrane acted on the repair of liver fibrosis in both modes of application, with the application of the amniotic membrane around only one hepatic lobe being more effective in reducing the severity / extent of fibrosis.
DOI: 10.6084/m9.figshare.9871301.v1
title: Accuracy of mobility tests for screening the risk of falls in patients with mild cognitive impairment and alzheimer’s disease

description: ABSTRACT Identifying gait and balance disorders in the earlier stages of Alzheimer’s disease (AD) and Mild Cognitive Impairment (MCI) could reduce or prevent falls in older adults. This cross-sectional study aimed to determine which mobility tests best discriminate the risk of falls in MCI and mild AD. Functional mobility was assessed by the timed up and go test (TUG) and 10-meter walk test (10MWT). A calendar of falls was produced, with follow-up via telephone calls during 6 months. For the MCI Group (n=38), time spent on the 10MWT was the best variable for discriminating fallers, with a cut-off point of 10.69 seconds associated with the highest accuracy (76.3%). In the AD Group (n=37), 10MWT cadence was the best variable for discriminating fallers, with a cut-off point of 101.39 steps per minute associated with an accuracy of 81.1%. As a conclusion, 10MWT time and cadence were the most accurate variables for screening the risk of falls in MCI and mild AD, respectively. The 10MWT is a functional, simple and easy test and it should be widely used in clinical practice.
DOI: 10.6084/m9.figshare.9871295.v1
title: Antifibrotic effects of total or partial application of amniotic membrane in hepatic fibrosis

description: Abstract: Liver fibrosis is the final common pathway of chronic liver diseases, having cirrhosis as a possible progression, which has liver transplantation as the only effective treatment. Human amniotic membrane represents a potential strategy as a therapy for liver fibrosis, due to its anti-inflammatory, anti-fibrotic and immunomodulatory properties. The aim of this study was to evaluate amniotic membrane effects as a treatment for hepatic fibrosis induced in rats by bile duct ligation (BDL), verifying alterations between two different forms of amniotic membrane application, around all the lobes of the liver and around only one lobe of the liver. Two weeks after inducing fibrosis, an amniotic membrane fragment was applied to the surface of the liver, covering it either totally or partially. Four weeks later, the animals were euthanized and liver samples were collected. Histopathological and quantitative analyses demonstrated fibrosis severity decrease and an extremely significant reduction in the deposition of collagen in the groups treated with amniotic membrane, particularly when the amniotic membrane was applied in only one liver lobe. It is concluded that the amniotic membrane acted on the repair of liver fibrosis in both modes of application, with the application of the amniotic membrane around only one hepatic lobe being more effective in reducing the severity / extent of fibrosis.
DOI: 10.6084/m9.figshare.9871298
title: Investigating the Effect of Curing in the Chloride Diffusion Coefficient of Conventional Concrete

description: Concrete is the most used material in the construction industry worldwide. Built concrete infrastructure is exposed to specific environments conditions during the asset’s life, which impose chemical and physical actions that may lead to premature deterioration. Poor concrete durability and corrosion of reinforcement bars are the primary cause of structural deterioration and reduced service life. Most concrete deterioration mechanisms are driven by transport properties, in particular, the chloride diffusion coefficient. In this paper, the effect of curing in the chloride diffusion coefficient of conventional concrete is investigated through Electrochemical Impedance Spectroscopy (EIS). Reinforced concrete samples cured for 3, 7 and 28 days were exposed to accelerated chloride testing for 300 days (40 wet-dry cycles). Results indicate that the chloride diffusion coefficient reduces significantly with curing time, evidencing that prolonged curing may decrease the likelihood of corrosion in reinforced concrete structure when combined with appropriate design and construction processes.