Universidade Federal de Goiás
  • Goiânia, Goias, Brazil
Recent publications
Resumo: Nesse trabalho foi realizada uma decomposição espacial do crescimento da Produtividade Total dos Fatores (PTF) do setor agropecuário brasileiro, incluindo componentes diretos (próprios) e indiretos (spillover), no contexto de uma análise de fronteira de produção espacial autorregressiva (SAR) para dados em painel, utilizando os dados censitários de 1995/96, 2006 e 2017 a partir de unidades produtivas referentes a 510 Regiões Geográficas Imediatas (RGI). Os resultados obtidos mostram que o crescimento da PTF foi de 3,87% a.a. na média do período completo, considerando-se apenas os efeitos diretos, e de 6,96% a.a., considerando-se os efeitos totais. Constatou-se também um maior crescimento da PTF no período mais recente e isso está relacionado à expansão da fronteira agrícola para as regiões com baixa produtividade anteriormente. Variáveis como financiamento da agricultura e pecuária, aptidão agrícola, malha rodoviária, plantio direto, correção de solo, escolaridade superior e assistência técnica, mostraram-se estatisticamente significativas na determinação da PTF. Os resultados sugerem que o crescimento da PTF é correlacionado espacialmente e temporalmente, e que spillovers espaciais e seus efeitos locais e globais impactaram a PTF nos três períodos censitários analisados.
A triangle center such as the incenter, barycenter, etc., is specified by a function thrice- and cyclically applied on sidelengths and/or angles. Consider the 1d family of 3-periodics in the elliptic billiard, and the loci of its triangle centers. Some will sweep ellipses, and others higher-degree algebraic curves. We propose two rigorous methods to prove if the locus of a given center is an ellipse: one based on computer algebra, and another based on an algebro-geometric method. We also prove that if the triangle center function is rational on sidelengths, the locus is algebraic.
In the last decade, other quality attributes have emerged as the main aspects that impact pork consumers acceptance, such as environmentally friendly production, nutritional value, and animal welfare. This study applies a Check-All-That-Apply (CATA) questionnaire for sensory characterization of loins from genetically lean immunocastrated male pigs fed diets containing either a standard commercial diet with 1.5 % soybean oil (control) or 3 % oil from either soybean oil (SO), canola oil (CO), or fish oil (FO) during the growing-finishing phases. Twenty CATA attributes for loin samples were generated. We interviewed 101 consumers to select all the CATA terms that they considered suitable to characterize sensory attributes of longissimus lumborum muscle samples of pigs from each dietary treatment. The CATA results indicated differences among pork loin samples depending on the source and inclusion level of dietary oil. Loins from pigs fed 3 % SO were characterized by a higher frequency of the “juicy texture” attribute (p < 0.05) and a lower frequency of the “dry texture” attribute (p < 0.05) compared to loins from 3 % FO-fed pigs. Moreover, loins from pigs fed 3 % SO had a lower citation frequency of the “tasteless” attribute (p < 0.05) compared to loins from 3 % FO-fed pigs. The attributes “cooked pork meat-like taste”, “juicy texture”, “tender texture”, and “brightness” were placed close to the overall liking. “Tender texture”, “juicy texture”, “pork meat-like” (odor and taste), and “cooked pork meat-like taste” attributes were considered drivers of liking. Feeding genetically lean immunocastrated male pigs with diets containing 3 % SO may be advisable from a pork sensory quality perspective. CATA; dietary oil source; immunologic castration; sensory profile; pork meat
Iron (Fe) is a micronutrient for plant development, as constituent of several photosynthesis- and respiration-related proteins and enzymes. Consequently, Fe deficiency leads to chlorosis in leaves and plant growth impairment. It has become increasingly evident that light signals coordinate iron homeostasis in plants. To further address new insights into how light is a fundamental part of Fe deficiency responses, we employed Micro-Tom (wild type, WT) tomato (Solanum lycopersicum L.) plants and high-pigment 1 (hp1) and aurea (au) photomorphogenic mutants, which exhibit an excessive light response and low light perception, respectively. Plant growth, pigment contents, oxidative status, and nutrient profile were analyzed. The results revealed the influence of the different genotypes on Fe deficiency responses. WT and au exhibited plant growth reduction under Fe deficiency. WT, hp1 and au demonstrated that Fe availability and light perception play fundamental roles in chlorophyll and anthocyanin biosynthesis. Lipid peroxidation was not increased for any genotype under Fe deficiency, indicating that mutations in light perception and signaling differentially modulate H2O2 production and scavenging under this condition. Additionally, macronutrients and micronutrients were taken up and distributed differently among the different plant genotypes, tissues and Fe conditions analyzed. In general, the au plants accumulated lower amounts of nutrients (Ca, S, P, Mg, B and Zn) than the WT and hp1 genotypes regardless of the Fe concentrations. Our data clearly indicates that light perception and signaling influence Fe-dependent morphophysiological responses in plants, suggesting possibilities for biotechnological improvement of crops grown under Fe shortage.
Pequi (Caryocar spp.) is a fruit native to the Brazilian Savannah (Cerrado), and Caryocar brasilienseCamb. is one of the most prevalent species in this biome. The consumption of the pequi pulp has been associated with health benefits, such as antioxidant, anti-inflammatory, hypolipidemic, hepatoprotective, and anticarcinogenic effects. These benefits have been attributed to its high density in nutrients and bioactive compounds. However, there is evidence about considerable variation in the nutritional profile among pequi pulps of different species, and among pulps of the same species, but from different areas of the Cerrado. In addition, there is no information in literature regarding the polyphenols profile of C. brasiliense pulp, neither about the influence of the native area of the fruit on the composition of these phytochemicals. So, this study analyzed the nutrient composition and identified the phenolic compounds in the pulp of C. brasiliense fruits native to four different areas of the Cerrado. There was a remarkable variation in the contents of energy (176.3-387.2 kcal/100 g) and lipids (13.0-37.5 g/100 g) among samples. In contrast, no difference was observed in the polyphenols composition, since gallic acid, protocatechuic acid, catechin, epicatechin, p-coumaric acid, and ellagic acid were identified in all pequi pulps. C. brasiliense pulp shows potential to be used as a functional ingredient rich in bioactive compounds, but with different contents of energy and lipids according to the fruit’s native area to attempt distinct health allegations of the product.
The emergence of the developmental origins of health and disease hypothesis, also known as fetal programming or the Barker hypothesis, was derived from the observed long-term effects on adult health from a low birth weight. The first studies pointing at relationships between early life experience and adult health were presented by Forsdahl and Wadsworth. However, it was with Barker’s works that the scientific community gained awareness about the contribution of the gestational environment to the long-term health of the offspring. These and other more recent studies revealed a strong relationship between fetal growth restriction and adult sequelae, demonstrating that adults who were small at birth, but not premature, were at an increased risk for coronary heart disease. Association of hypertension to health status at birth was also corroborated by an epidemiological study using a Finish cohort of approximately 6000 subjects. During the Dutch famine, from 1944 to 1945, investigators could determine the impact of undernutrition in early, mid or late gestation on birth weight. Babies exposed to famine only during early gestation still presented a normal birth weight, but an augmented incidence of coronary heart and renal diseases in later life compared with non-exposed individuals. Another interesting finding was the existence of a conditional adaptive response by the fetus, which confers a survival advantage when the postnatal diet remains suboptimal, but becomes harmful when postnatal nutrition is adequate or in excess. In agreement with epidemiological human observations, studies in rodents, sheep, and non-human primates report accelerated F1 aging and early disease development induced by maternal nutrition during pregnancy.
Aiming at finding natural sources of antidiabetics agents, 15 extracts from Brazilian medicinal plants of the Atlantic Forest and Amazon region were tested against α-glucosidase enzyme. Plants were selected based on the taxonomic relationships with genera including several species with antidiabetic activity. In this screening, the extracts obtained from the flowers of Hyptis monticola and the leaves of Lantana trifolia and Lippia origanoides resulted endowed with promising anti-α-glucosidase activity. The extracts from H. monticola and from L. origanoides collected in two different areas, were characterised by ultra-high performance liquid chromatography coupled to mass spectrometry. Bioassay-guided fractionation led to the identification of several enzyme inhibiting compounds, among them the mechanism of action of naringenin and pinocembrin was investigated. The two L. origanoides extracts showed differences in bioactivity and in the phytochemical profiles. The fractionation of the extract from H. monticola led to a partial loss of the inhibitory effect.
Objective To provide guidelines on the coronavirus disease 2019 (COVID-19) vaccination in patients with immune-mediated rheumatic diseases (IMRD) to rheumatologists considering specific scenarios of the daily practice based on the shared-making decision (SMD) process. Methods A task force was constituted by 24 rheumatologists (panel members), with clinical and research expertise in immunizations and infectious diseases in immunocompromised patients, endorsed by the Brazilian Society of Rheumatology (BSR), to develop guidelines for COVID-19 vaccination in patients with IMRD. A consensus was built through the Delphi method and involved four rounds of anonymous voting, where five options were used to determine the level of agreement (LOA), based on the Likert Scale: (1) strongly disagree; (2) disagree, (3) neither agree nor disagree (neutral); (4) agree; and (5) strongly agree. Nineteen questions were addressed and discussed via teleconference to formulate the answers. In order to identify the relevant data on COVID-19 vaccines, a search with standardized descriptors and synonyms was performed on September 10th, 2021, of the MEDLINE, EMBASE, Cochrane Central Register of Controlled Trials, ClinicalTrials.gov, and LILACS to identify studies of interest. We used the Newcastle–Ottawa Scale to assess the quality of nonrandomized studies. Results All the nineteen questions-answers (Q&A) were approved by the BSR Task Force with more than 80% of panelists voting options 4—agree—and 5—strongly agree—, and a consensus was reached. These Guidelines were focused in SMD on the most appropriate timing for IMRD patients to get vaccinated to reach the adequate covid-19 vaccination response. Conclusion These guidelines were developed by a BSR Task Force with a high LOA among panelists, based on the literature review of published studies and expert opinion for COVID-19 vaccination in IMRD patients. Noteworthy, in the pandemic period, up to the time of the review and the consensus process for this document, high-quality evidence was scarce. Thus, it is not a substitute for clinical judgment.
Background Winter swimming developed from a national tradition into a health-improving sport with international competitions. The difference in performance between women and men was thoroughly examined in various sporting disciplines; however, there is little data on winter swimming events. Therefore, this study aims to compare the sex differences in female and male winter swimmers for a distinct stroke over distances of 25 m and 200 m in ice water, freezing water and cold water in the multiple stages of the Winter Swimming World Cup, hosted by the International Winter Swimming Association (IWSA) since 2016. Methods All data included in this study were obtained from the official results of the Winter Swimming World Cup, published on the “International Winter Swimming Association” (IWSA) website. The Mann–Whitney U test was used to compare race time between sexes in different swimming strokes and categories of water. In contrast, the Kruskal–Wallis H test was used to compare differences between swimming strokes or water categories for the same sex. Results For 25 m and 200 m events of the “IWSA World Cup,” male athletes were faster than female athletes, regardless of stroke and water temperature category. However, the effect size of the difference between the sexes was greater in 25 m than in 200 m for all strokes and water temperatures. Swimming speed for the same-sex differed between the swimming stroke in relation to the water temperature category. Head-up breaststroke was found to be the slowest stroke (p < 0.05). Conclusion In water temperatures between − 2° and + 9 °C, men were faster than women in all stages of the “IWSA World Cup,” regardless of the swimming stroke, but the effect size of the difference between the sexes was greater in shorter than in longer events.
Background Heart failure (HF) is the most prevalent disease among chronic diseases and has been associated with a high prevalence of erectile dysfunction (ED). Objective this study aims to analyze research that has as its object of study the sexual activity of patients with HF. Methods A high-sensitivity search was performed in databases (PUBMED via MEDLINE, Cochrane, EMBASE, Web of Science, SCOPUS AND CINAHL) using descriptors linked to sexuality and heart failure. Results Fifteen studies from 7 countries with a total sample of 6244 participants were included. Conclusion It was identified that patients with HF have alterations in their sexual activities, which are more common in males. Among men, it was noticed that the most reported sexual disorder was erectile dysfunction.
Shunt reactors are used for long and high voltage transmission lines operation. Therefore, it is necessary to use a protection logic to identify turn-to-ground and turn-to-turn faults with few turns involved or high leakage factor value. In this context, the present work evaluates the use of differential functions based on Alternative Current Alpha Plane and based on Enhanced Generalized Alpha Plane for dry-type air-core shunt reactors protection. These algorithms are independent of voltage measurement and are implemented considering the reactor’s zero-sequence current and neutral current. Based on simulations implemented in the Alternative Transient Program software, different turn-to-ground and turn-to-turn faults were investigated by varying the number of short-circuited turns, the leakage factor value, and fault resistance value. The obtained results reveal that the joint use of these functions guarantees a more secure identification of internal faults in shunt reactors, even when dealing with low current faults.
Given a finite, simple, and undirected graph G=(V,E), a P3-convex set of G is a set S⊆V(G) such that every vertex of V(G)∖S has at most one neighbor in S, and the P3-convex hull of a vertex subset S′ of G is the smallest P3-convex set containing S′. The P3-hull number h(G) is the cardinality of the smallest set of vertices whose P3-convex hull is V(G). In this paper, we establish some bounds on the P3-hull number of graphs with diameter two. Particularly, for a biconnected diameter-two graph G it holds that h(G)≤⌈log(Δ(G)+1)⌉+1, while a non-biconnected diameter-two graph G has h(G)=cc(G−v), where v is a cut vertex of G and cc(G−v) is the number of connected components of G[V∖{v}]. In addition, we show that the P3-hull number of biconnected C6-free diameter-two graphs is at most 4, while for strongly regular graphs G=G(n,k,b,c) it holds that h(G)≤min{⌈k1+b⌉+1,⌈logc+1(k.c+1)⌉+1}. Finally, we consider the P3-interval number, which is the cardinality of the smallest set S of vertices such that every vertex not in S has two neighbors in this set. We show that computing the P3-interval number on diameter-two split graphs is NP - complete.
In this study, the semisolid deformability and processability of three CoCrCuxFeNi high-entropy alloys (x = 1, 2, and 3) were evaluated. At 1175 °C, the Cu content had a major influence on the semisolid deformation due to its control of the liquid fraction. The semisolid alloys displayed a typical pseudoplastic rheological behavior. Only the CoCrCu3FeNi alloy filled the die completely during thixoforming. The Vickers hardness decreased with increasing Cu content due to the different hardness values of the constituent FCC phases. The compression test results showed that the thixoformed CoCrCu3FeNi had good plasticity and a yield stress of 310 MPa. Thus, semisolid processing can be an alternative route for manufacturing components made of high-entropy alloys.
Neste artigo, objetivou-se investigar três programas de educação socioemocional, durante a pandemia de Covid-19, de 11 de março a 31 de dezembro de 2020, por meio da mídia social Instagram, considerando que, durante esse período, tornou-se quase um imperativo às escolas lidarem com sentimentos, como: medo, ansiedade, desamparo e desânimo. O estudo é qualitativo e exploratório; a pesquisa, com temas relacionados à emoção, é eletrônica e bibliográfica; e os teóricos estudados são Henri Wallon e outros. As discussões abordam as categorias: concepção de educação socioemocional; abordagem das emoções na pandemia e relação indivíduo e sociedade. Os dados indicam que os programas ocupam a lacuna historicamente vazia de colocar em debate a emoção no campo da educação escolar, mas também mostram riscos que os programas assumem, como: desvalidação e hierarquização de sentimentos e responsabilização individual descolada das condições históricas. educação socioemocional; pandemia de Covid-19; Instagram.
The use of vegetal species for gold nanoparticles (AuNPs) biosynthesis can constitute an alternative to replacing the extensive use of several hazardous chemicals commonly used during NPs synthesis and, therefore, can reduce biological impacts induced by the release of these products into the natural environment. However, the “green nanoparticles” and/or “eco-friend nanoparticles” label does not ensure that biosynthesized NPs are harmless to non-target organisms. Thus, we aimed to synthesize AuNPs from seaweed Gracilaria crassa aqueous extract through an eco-friendly, fast, one-pot synthetic route. The formation of spherical, stable, polycrystalline NPs with a diameter of 32.0 nm ± 4.0 nm (media ±SEM) was demonstrated by UV–vis spectroscopy, field emission scanning electron microscopy, and high-resolution transmission electron microscopy, energy-dispersive X-ray and X-ray diffraction measurement, and Fourier-transform infrared spectroscopy analysis. In addition, different phytocomponents were identified in the biosynthesized AuNPs, using Gas Chromatography-Mass Spectrometry (GC-MS). However, both G. crassa aqueous extract and the biosynthesized AuNPs showed high ecotoxicity in Anopheles stephensi larvae exposed to different concentrations. Therefore, our study supports the potential of seaweed G. crassa as a raw material source for AuNPs biosynthesis while also shedding light on its ecotoxicological potential, which necessitates consideration of its risk to aquatic biota.
We discuss the existence of multiple positive solutions leading to the occurrence of an S-shaped bifurcation curve to the equations of the form −Δpu=f(u), with p>1. We deal with relatively unexplored cases when f is non-Lipschitz at 0, f(0)=0 and f(u)<0, u∈(0,r), for some r<+∞. Using the nonlinear generalized Rayleigh quotients method we find a range of parameters where the equation may have distinct branches of solutions. As a consequence, applying the variational methods, we prove that the equation has at least three positive solutions with two of them linearly unstable and one linearly stable. The results evidence that the bifurcation curve is S-shaped and exhibits the so-called dual cusp catastrophe. Our results are new even in the one-dimensional case and p=2.
The discovery of the pre-salt oil field renewed and expanded the outlook of the Brazilian petroleum industry due to the large volume of oil and its composition. The chemical composition characterization of crude oils from different reservoirs is crucial for the petroleum industry. In this study, comprehensive profiles of polar acidic nitrogen- and oxygen-containing compounds were accessed by electrospray ionization (ESI) in negative mode coupled to Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR MS) for a set of five Brazilian crude oil samples from the pre-salt layer, and these were compared to the chemical composition of four crude oils from post-salt reservoirs. The ESI (-) FT-ICR MS data showed that the N-containing compounds present high relative abundance among the heteroatomic compounds identified for pre- and post-salt crude oils, which was more notable for the pre-salt crude oils. Comparing the heteroatomic profiles of the pre- and post-salt crude oils, the N2, NO, and O classes were seen to decrease in relative abundance in the post-salt crude oil, whereas the NO2 and O2 classes increased in relative abundance. The acyclic to cyclic acid (A/C) ratio of the O2 class was used as a parameter to classify the pre- and post-salt crude oils. The high content of acyclic O2-containing compounds (A/C ratio > 1.2) indicated that the pre-salt crude oils are more preserved from microbial alteration, leading to the formation of O2-containing compounds, while an A/C ratio < 0.2 for post-salt crude oils categorized them as more biodegraded. A modified A/C ratio that included aromatic O2 compounds, analyzed in a ternary diagram, was also used to classify the oils according to their families: pre- and post-salt crude oils. Considering the O2-containing compounds with 1, 3, and 5 DBE (double bond equivalents), it was possible to group these oils according to their reservoirs. In addition, alkylphenols with DBE = 4, 5, and 6 also demonstrated a tendency to identify the oils according to their pre- and post-salt reservoirs. The petroleomic approach shown here by comprehensive FT-ICR mass spectrometry analysis is a powerful tool for differentiating crude oils from pre-salt and post-salt reservoirs.
Friedel's salt is an AFm phase playing a major role in immobilizing chloride ions in cement-based materials. This phase exhibits a displacive phase transition between 30 and 40 °C. Data on the physical properties of Friedel's salt and their temperature dependence is lacking in the literature. Here, we perform molecular simulations to compute Friedel's salt's elastic constants, heat capacity, and thermal expansion. AFFF, a force field focusing on AF-phases in cement systems, is extended to account for phases with chloride. We capture the temperature transition with the simulations, provide the thermoelastic properties as a function of the temperature, and assess the dynamics of water and chloride in Friedel's salt. Such information can be readily used in multiscale modeling requiring data on Friedel's salt thermoelastic properties.
An efficient and robust photocatalysts have been developed by combining bimetallic CuNi nanoparticles and TiO2. Simple co-reduction of CuCl2.2H2O and NiCl2.6H2O in 1-n-butyl-methylimidazolium tetrafluoroborate (BMIm.BF4) ionic liquid affords small sized (4–5 nm) bimetallic CuNi NPs. Low-Energy Ion Scattering (LEIS) and magnetic measurements analyses reveals that the NPs are alloyed nanostructure-having Ni enriched surface. CuNi NPs decorated on P25-TiO2 remarkably promote the generation of CH3OH and syngas as compared to their monometallic counter-parts using 1200 mW LEDs of 450 nm (visible) light irradiations in an optofluidic microreactor. The system continuously produces CH3OH with a rate of 102.1 μm.g⁻¹.h⁻¹ (AQY 0.90%) and syngas (H2 118.8 and CO 24.6 μmol.g⁻¹.h⁻¹), represents a high yield and quantum efficiency. Where as, its counter-part, Ni/TiO2, generate CH3OH with a rate of 37.0 μm.g⁻¹.h⁻¹, H2 200.0 μmol.g⁻¹.h⁻¹ and CO 15.1 μmol.g⁻¹.h⁻¹ having 0.33, 0.59 and 0.1% AQY, respectively. The presence of Cu in CuNi NPs significantly boosts the catalytic performance via metal dilution and synergistic effect, causes the red shift and increases the conductivity, while Ni increases the band gap, thereby achieving a record high CH3OH rate generation.
Institution pages aggregate content on ResearchGate related to an institution. The members listed on this page have self-identified as being affiliated with this institution. Publications listed on this page were identified by our algorithms as relating to this institution. This page was not created or approved by the institution. If you represent an institution and have questions about these pages or wish to report inaccurate content, you can contact us here.
6,224 members
Ana Luiza Lima Sousa
  • Faculdade de Enfermagem (FEN)
Carolina Horta Andrade
  • Faculdade de Farmácia (FF)
Ruth Minamisava
  • Faculdade de Enfermagem (FEN)
Ruffo Freitas-Junior
  • Program of Mastology
Elismauro Francisco Mendonça
  • Departamento de Ciências Estomatológicas (DCE)
Universidade Federal de Goiás, Campus Samambaia (Campus II), Caixa Postal 131, 74001-970, Goiânia, Goias, Brazil
Head of institution
Federal University of Goiás