Universidade Estadual De Londrina Research Articles

The Pioneering Role of Women from Universidade Estadual de Londrina in the Dissemination of Behavior Analysis in Brazil

The Pioneering Role of Women from Universidade Estadual de Londrina in the Dissemination of Behavior Analysis in Brazil

Use of reduced Bokashi doses is similar to NPK fertilization in iceberg lettuce production

The aim of the study was to compare horticultural variables of iceberg lettuce using two Bokashi compost doses, alone and in combination, with the bioactivator Penergetic (Penergetic International AG®) against standard mineral fertilization (NPK) in three crop cycles. Experiments were conducted in a plastic greenhouse at the Universidade Estadual de Londrina, Brazil (548 m a.s.l.). The treatments were: negative control (water, only); positive control (NPK, 4-14-8); Penergetic alone; Bokashi doses 5 g and 10 g/plant with or without a combination with Penergetic. Lettuce plants were grown in pots filled with soil. Commercial biomass (CM), head diameter (HD), plant height (PH) and chlorophyll index (CI) were evaluated. In the three cycles tested, the Bokashi 10 g/plant, Bokashi 10 g/plant + Penergetic, and NPK treatments surpassed the control. The studied variables (CM, HD, PH and CI) in the lower Bokashi dose treatment were also higher than controls but lower than higher Bokashi doses and NPK. Penergetic increases the CM in the lower Bokashi dose treatment just in the first production cycle, probably due to the poor organic matter content in the soil. The treatment Bokashi 10 g/plant improved significantly the lettuce horticultural variables vs. control treatments and was similar to chemical fertilization in two or three crop cycles.

Seroepidemiology Survey of Bovine Alphaherpesvirus 1 (BoHV-1) in Unvaccinated Beef Bubalines (Bubalus bubalis) from Southern Brazil

Background: The bovine alphaherpesvirus type 1 (BoHV-1) belonging to the order Herpesvirales, family Herpesviridae, subfamily Alphaherpesvirinae and genus Varicellovirus.Bovine alphaherpesvirus 1 (BoHV-1) infections have a great importance due to the high rates of dissemination in cattles worldwide. Although, the BoHV-1 was largely related in cattle, buffaloes were also classified as host for the virus. However, studies that determine seroepidemiological data in this species are scarce and necessary. The aim of the present study was to determine the presence of antibodies against BoHV-1 in healthy beef buffaloes using the virus neutralization (VN) technique.Cases: This work portrays an epidemiological survey, based on a sectional study characterized by blood samples collected from 54 Murrah buffalo, aged 6 to 24 months, from the municipalities of Guaraqueçaba, Ponta Grossa, Antonina and Doutor Ulysses, located in Paraná state, being 20, 14, 10 and 10 samples from each location, respectively. Thirty-seven percent (20/54) of the samples were collected at slaughterhouse with registration at the Federal Inspection Service (SIF) of the Ministry of Agriculture, Livestock and Food Supply (MAPA), and 63% (34/54) at the buffalo's farms. The serum samples were collected in sterile tubes without anticoagulant in stored isothermal boxes, with serum separation and stored at -20ºC. The samples were sent to the Animal Virology Laboratory of Universidade Estadual de Londrina, UEL for serological analysis. Serological diagnosis using the virus neutralization (VN) technique was performed according the OIE manual of diagnostic tests and vaccines for terrestrial animals, using the BoHV-1 Los Angeles strain. Forth-five of the 54 samples (83.3%) evaluated generated titers of antibodies against BoHV-1 present in all evaluated herds, and the samples collected in herd from Antonina city were 100% positive, following by 80% in Guaraqueçaba and Doutor Ulysses city, and 78.6% in Ponta Grossa city. In relationship to the titration of anti-bovine herpesvirus 1 antibodies (BoHV-1), it was found that 23/45 (51.12%) of the samples had titers ≤ 16, 13/45 (28.88 %) with indexes between 32-64, and 9/45 (20%) with levels above 128.Discussion: The confirmation of the presence of antibodies against BoHV-1 in the buffalo samples tested in the present study proves the circulation of the agent in the studied species, with a homogeneous distribution of bovine alphaherpesvirus 1 in all the evaluated herds. There was high variability in antibody titers against BoHV-1 from all herds, and the occurrence of a high number of buffaloes reactive to BoHV-1 and with high antibody titers suggests a course of active or reactive infections in these animals. In only one of the herds, the age of the animals studied varied between 6 to 8 months. The fact that these animals are lactating raises the possibility of anti-BoHV-1 antibodies being acquired by breastfeeding. The results obtained allow to conclude, considering the fact that the animals are not vaccinated against BoHV-1, the presence of circulating antibodies is from a natural infection, and the positivity in all farms tested denotes the endemicity of the BoHV-1 infection in herds. To the best knowledge of the authors, this is the first study on the detection and measurement of antibodies against BoHV-1 in healthy and unvaccinated buffaloes in the state of Paraná, southern Brazil, showing a high frequency of seroreagent animals.

A intolerância religiosa à brasileira: estudo de caso na cidade de Londrina / Paraná

The article discusses the permanence of intolerance and religious violence in Brazil, searching in documentary sources of the Catholic Church, commercial treaties and the Brazilian Constitutions information and data regarding the subject. Throughout history, forms of violence and intolerant practices of a religious nature remain and perpetuate themselves. The reports of religious intolerance reported in the media and the research data linked to the Laboratorio de Estudos sobre Religioes e Religiosidades da Universidade Universidade Estadual de Londrina subsidized the construction of the analysis on the permanence of this intolerance and violence, highlighting the case of Ya Mukumby family, “Mae de Santo” and leadership of the Movement Black in the city of Londrina, state of Parana - south brazilian region. Despite the increase in legal frameworks that combat intolerance and religious violence, new strategies are still being developed and re-elaborated from the school environment and digital social networks.

DIVERSIDADE GENÉTICA ENTRE ACESSOS DE SOJA TIPO ALIMENTO COM BASE NO ALGORITMO DE GOWER

The simultaneous evaluation of qualitative and quantitative traits is an excellent tool to estimate the genetic divergence among accessionsof germplasm banks. The present study aimedto characterize and estimatethe genetic divergence among soybean food type accessionsbased on Gower algorithm and identifies promising combination among accessionsevaluated. A total of 64 soybean genotypes were studied, which 60arefood type soybean accessions, twoarecommercial cultivars also for human consumption,and two are grain type commercial cultivars. Three qualitative and seven quantitativetraits were used to estimate the genetic divergence among genotypes. The experiment was carried out in the experimental areaof the Universidade Estadual de Londrina during 2015/2016season, using a randomized complete block design with four repetitions. It was observed the presence of genetic variability to all traits evaluated. Thegrainyield trait was the mostefficientin discriminating theevaluated accessions,while plant height showed lower contribution. The UPGMA method showed the highestcoefficient of cophenetic correlation allowing the formation of six different groups. The crossings AL06 × AL22 and AL07 × AL22 are promising for obtaining superior genotypes destined to the in naturaconsumption and production of soy milk and tofu. The combination AL13 × AL60 is considered favorable for obtaining genotypes destined to natto production. The use of the AL12 and AL13 accessions as parents is advantageous for obtaining genotypes for the production of kuroname.

Reflectance as a decision-making tool for the application of fungicide to the Asian Soybean Rust

The objective of this study was to evaluate the application of GreenSeeker® (radiometer) the ideal time of application of fungicide on soybeans and the relationship between NDVI (Normalized Difference Vegetation Index) and productivity. Two experiments were conducted at the Universidade Estadual de Londrina (2012/2013 and 2013/2014 crops), both with experimental design of random blocks (6x4). The treatments aimed at obtaining a disease gradient (Asian soybean rust) by means of different numbers and times of application of fungicide. The quantification of the severity of the disease was made through the diagram scale and the readings of NDVI. Were analyzed the total mass, the 1.000 grains mass, the humidity, and productivity in kg ha-1. A decrease in productivity was observed in connection with the delay in the application of the fungicide and the same happened in the area below the NDVI curve. At the same time when a statistical difference between the treatments of the severity was observed there was also a significant statistical difference (P<0.05) between the values of NDVI. The NDVI contributes to decision making about the best moment for the application of fungicide in the culture of soy for the control of Asian rust and presents regular results for the estimation of productivity.

Description of the male of Antodice quadrimaculata Martins Galileo, 2003 (Coleoptera, Cerambycidae, Lamiinae), with new country record for the species.

The genus Antodice Thomson, 1864 was revised by Martins Galileo (1998) and currently includes 27 species (Tavakilian Chevillotte 2017), distributed from Mexico to southern South America. Based on a single female specimen collected in Arroyo Cristal, Ka'azapá, Paraguay, the species Antodice quadrimaculata was first described by Martins Galileo in 2003. The holotype specimen was collected on 20 November 1999 by J. Jensen and is deposited in the Museum of Zoology of the University of São Paulo, Brazil. With the help of Carlos Aguilar, from Paraguay's National Museum of Natural History, we were able to determine the exact location where the holotype was collected. With the collection and the description of the male, presented herein, we describe the male of this species record its occurrence in Brazil, a new country record.We identified this species as belonging to the group of Antodice species with yellowish flagellomeres and a black apex, resembling Antodice venustula Lane, 1973 in its elytral color pattern. In A. venustula, the elytra are covered with whitish pubescence and exhibit only two patches of compact white pubescence. In A. quadrimaculata, according to Martins Galileo (2003), the elytra are of a reddish color with whitish pubescence on the dorsal anterior area and close to the apexes, and they also have three patches of compact white pubescence. The specimens of A. quadrimaculata cited herein were collected in the Iguaçu National Park (Parque Nacional do Iguaçu-PNI), the largest fragment of Atlantic forest in southern Brazil, located in the western region of the state of Paraná. The insects were collected using light traps, set up on nights with a new moon. The artificial light source was a 500-Watt incandescent lamp powered by a Honda EP 2500 generator. Sampling began at 6 p.m., ending between midnight and 3 a.m. the next day. The studied material was deposited in the entomological collection of the Museum of Zoology at the State University of Londrina (Universidade Estadual de Londrina), Londrina, Brazil (MZUEL). To better represent the expansion of the geographical distribution of the species from the holotype recorded in Paraguay (Fig. 5, 6), the cartographic material (Fig. 1) was produced using ArcGIS Software 9.0®. The map database was obtained from the Institute of Land, Cartography and Geosciences, (Instituto de Terras, Cartografia e Geologia do Paraná), Curitiba, Brazil (ITCG).

Epidemiological data and a score-based study of renal, hepatic and cerebral lesions in feline infectious peritonitis

The study describes the epidemiological and pathological findings observed in a population of cats with feline infectious peritonitis (FIP) and estimated the degree of tissue destruction in the kidney, brain, and liver. A retrospective study was performed to determine the number of cats with a histopathological diagnosis of FIP between 2005-2016, at the Laboratory of Animal Pathology, Universidade Estadual de Londrina. The histopathological alterations in selected organs (brain, liver and kidneys) associated with FIP were described and then compared with a scoring system to estimate the degree of tissue destruction. FIP was diagnosed in 3.7% (19/520) of all cats necropsied during the 11-year period; sexual and breed predominance were not identified. Cats that were less than one-year-old were more frequently diagnosed with FIP. Pyogranulomatous nephritis with vasculitis (94.7%; 18/19), coagulative renal necrosis (84.2%; 16/19), hepatocellular necrosis (57.9; 11/19), and necrotizing leptomeningitis (47.4%; 9/19) were the most frequent lesions observed. Moreover, FIP-associated renal lesions were more severe and frequently observed when compared with those in the brain and liver. It is proposed that necrosis be considered as an important lesion associated with FIP that should be included in the histopathological diagnosis of this disease.

Chitooligosaccharide for piglets: effects on performance, viscera and intestinal morphometry

The objective of this study was to evaluate the dose-response effect of a chitooligosaccharide (COS) produced by Universidade Estadual de Londrina over performance, diarrhea episodes, visceral characteristics and morphometry. A total of 72 Pen Ar Lan® piglets were weaned at 23 days and 7.51 ± 1.35 kg of BW. The treatment was a basic diet plus inclusion of 0, 50, 100, or 150 ppm of COS (100 mg/kg). For the visceral and morphometric evaluation, 24 animals were slaughtered at 31 days of age with 11.01 ± 1.25 kg of BW. No regression effect over the performance or diarrhea prevalence was observed. Higher doses of COS led to higher absolute values for large intestine weight, villus height in the jejunum and crypt depth in the jejunum and ileum; the villus/crypt ratio in the ileum was higher until the level of 100 ppm COS. More lesions were observed in the intestinal epithelium along with a higher total number of lymphocytes and eosinophils in the duodenum. High numbers of eosinophils were observed in the ileum when a higher level of COS was used. In general, increasing levels of COS led to better intestinal morphometry and activated somatic cells in the lamina propria of the piglet intestine; however, no influence was observed in the productive performance of these animals. Considering all studied parameters, the COS level of 100 ppm was the most promising under these experimental conditions.

Chitooligosaccharide for piglets: effects on performance, viscera and intestinal morphometry

The objective of this study was to evaluate the dose-response effect of a chitooligosaccharide (COS) produced by Universidade Estadual de Londrina over performance, diarrhea episodes, visceral characteristics and morphometry. A total of 72 Pen Ar Lan® piglets were weaned at 23 days and 7.51 ± 1.35 kg of BW. The treatment was a basic diet plus inclusion of 0, 50, 100, or 150 ppm of COS (100 mg/kg). For the visceral and morphometric evaluation, 24 animals were slaughtered at 31 days of age with 11.01 ± 1.25 kg of BW. No regression effect over the performance or diarrhea prevalence was observed. Higher doses of COS led to higher absolute values for large intestine weight, villus height in the jejunum and crypt depth in the jejunum and ileum; the villus/crypt ratio in the ileum was higher until the level of 100 ppm COS. More lesions were observed in the intestinal epithelium along with a higher total number of lymphocytes and eosinophils in the duodenum. High numbers of eosinophils were observed in the ileum when a higher level of COS was used. In general, increasing levels of COS led to better intestinal morphometry and activated somatic cells in the lamina propria of the piglet intestine; however, no influence was observed in the productive performance of these animals. Considering all studied parameters, the COS level of 100 ppm was the most promising under these experimental conditions.

Diálogo entre as dimensões da competência em informação e os cursos de graduação em Arquivologia do sul do Brasil

Este estudo busca identificar em que medida as quatro dimensões da competência em informação (técnica, estética, ética e política) relacionam-se ao perfil desejado para os egressos dos cursos de graduação em Arquivologia de três universidades do sul do Brasil: Universidade Estadual de Londrina, Universidade Federal de Santa Catarina e Universidade Federal do Rio Grande do Sul. No tocante aos aspectos metodológicos, identifica-se como pesquisa exploratória, documental e bibliográfica e propõe-se a pensar a Arquivologia como ciência que contempla aspectos teóricos, práticos, imbuídos de diretrizes e diálogos entre os profissionais, os acervos e seus usuários. A pesquisa considerou que as quatro dimensões da competência em informação estão relacionadas ao perfil dos egressos constantes nos Projetos Pedagógicos das três universidades pesquisadas e que tal ponderação contribui para pensar a Arquivologia em seu macro espaço.

Representações de História em Jovens da Escola Básica e da Universidade: um Estudo sobre Pensamento Histórico e Identidade

O artigo tem como objetivo estudar o confronto de representações sociais entre jovens do Ensino Médio do período noturno de uma escola pública de Londrina - PR e da graduação em História da Universidade Estadual de Londrina, por meio da análise de ideias históricas que remetem a aspectos de sua orientação temporal e formação identitária. A pesquisa pautou-se por utilizar elementos de inspiração etnográfica e questionários qualitativos, com o fim de conhecer os perfis socioeconômicos e culturais, bem como aspectos importantes relacionados à formação do pensamento histórico dos grupos pesquisados.

Currículo da comunicação social: um breve estudo sobre o ensino da fotografia na graduação e a formação do fotógrafo comunicador

Este artigo é fruto de uma pesquisa a respeito do ensino da disciplina de fotojornalismo nos cursos de Graduação em Comunicação Social, incluindo as habilitações de Jornalismo, Publicidade e Propaganda e Relações Públicas, ainda vigentes na data em que os respondentes cursaram o ensino superior. A pesquisa realizada levantou dados, por meio de questionário online, com alunos egressos dos cursos das faculdades Opet, Positivo, Pontifícia Universidade Católica do Paraná (PUCPR), Tuiuti, Universidade Estadual de Londrina (UEL), Universidade Federal do Paraná (UFPR), Universidade Federal do Rio Grande do Sul (UFRGS), Universidade Federal de Santa Maria (UFSM), UniBrasil e UniCuritiba. Uma breve pesquisa em bancos de teses e dissertações apontou a ausência de trabalhos que se debrucem sobre o ensino da fotografia dentro da matriz curricular do ensino superior, indicando uma área a ser explorada, além de evidenciar uma deficiência de atenção por parte de pesquisadores a respeito do tema. A priori, o trabalho se deu como um recorte de tema sobre o currículo da comunicação social e o ensino da disciplina de fotografia na formação do fotógrafo comunicador, que posteriormente foi aprofundada em uma dissertação de mestrado, cuja realização exigiu nova pesquisa com maior aprofundamento teórico e coleta de dados com novo foco. O resultado desta pesquisa inicial é um ensaio que aponta a avaliação que os ex-alunos dos cursos de Comunicação Social das Universidades supracitadas fazem a respeito do ensino de fotografia que lhes foi oferecido durante a graduação.

Yield, nutritional state and silicon accumulation in lettuce cultivars fertilized with calcium silicate

The objective of this work was to evaluate the application of calcium silicate in the yield and nutritional state of lettuce plants and to verify forms of foliar Si accumulation, using scanning electron microscopy (SEM), at the Universidade Estadual de Londrina greenhouse. Experimental design was randomized, in a 4x2 factorial scheme with four replications, including four lettuce cultivars (Lucy Brown, Vanda, Elisa and Romaine) and two doses of silicate calcium (0 and 4000 kg ha-1). Calcium silicate application showed no differences for yield, growth and nutritional state in the assayed plants. Differences among cultivars were probably due to genotypic traits. The Romaine cultivar showed greater aerial part fresh matter, aerial dry matter and height. Lucy Brown and Romaine cultivars showed greater N content. ‘Lucy Brown’, ‘Romaine’ and ‘Vanda’ showed greater K content. The Elisa cultivar showed the greatest Ca, Mg and Zn contents. The Elisa and Romaine cultivars showed the greatest Si content. The scanning electron micrograph revealed that there was no development of siliceous bodies in the lettuce, and Si foliar accumulation occurred sparsely.

Formação de professores de história: o princípio investigativo como fundamento da prática de ensino

Pretende-se neste artigo discutir as diretrizes de funcionamento do Estágio Supervisionado do curso de História da Universidade Estadual de Londrina, no Estado do Paraná, no sentido de refletir sobre a relação teoria/prática na formação do profissional de História. Para tanto, destacam-se as diretrizes teóricas e metodológicas que fundamentam as disciplinas do curso voltadas para a formação do futuro professor de história, considerando a disciplina e seu código disciplinar como importante para a constituição da experiência dessa formação inicial. Acredita-se ser importante caracterizar também o funcionamento do estágio, suas etapas, sua organização curricular, bem como a posição do aluno frente ao estágio de história, conforme investigação de suas ideias sobre a experiência pós-regência. Partindo dos relatórios de estágio como fontes desta pesquisa, considerou-se as experiências dos graduandos do sétimo e oitavo semestre do curso de História dos anos 2010 e 2011. Visando a construção da literacia histórica, as etapas do estágio de história e a proposta didático-pedagógica para o ensino e aprendizado histórico demonstram que procurou-se fundamentar conforme o princípio investigativo próprio do campo da História, segundo o modelo de aula-oficina proposto por Isabel Barca.

“Paraná fala inglês” na UEPG: experiência extensionista com foco na mobilidade internacional

http://dx.doi.org/10.5007/1807-0221.2015v12n20p73O projeto “Paraná Fala Inglês” é uma proposta da SETI (Secretaria da Ciência, Tecnologia e Ensino Superior) junto às universidades estaduais do Paraná, para impulsionar a mobilidade internacional de alunos de graduação e pós-graduação, docentes e agentes universitários. O projeto iniciou-se em 2014, sendo a primeira etapa do programa da SETI “O Paraná Fala Línguas Estrangeiras”. Sete universidades participam do programa: Universidade Estadual de Ponta Grossa (UEPG), Universidade Estadual de Londrina, Universidade Estadual de Maringá, Universidade Estadual do Norte do Paraná, Universidade Estadual do Paraná, Universidade Estadual do Oeste do Paraná e Universidade Estadual do Centro-Oeste do Paraná. Esse artigo apresenta os resultados parciais desse programa na UEPG sob a forma do curso de extensão, aprovado e registrado pela Pró-Reitoria de Extensão e Assuntos Culturais, “Paraná Fala Inglês – Curso preparatório intermediário e pós-intermediário do TOEFL-iBT”. Ainda, objetiva-se discutir as perspectivas do projeto para sua finalização em 2016.

<b>AFLP analysis of genetic diversity in determinate and indeterminate snap bean accessions

The present study aimed to estimate and characterize the genetic divergence between determinate and indeterminate snap bean accessions from the Universidade Estadual de Londrina (UEL) germplasm bank based on amplified fragment length polymorphism (AFLP) markers. A total of 40 and 32 accessions with determinate and indeterminate growth habits, respectively, were characterized for this purpose. Seven combinations of primers corresponding to EcoR1 and Mse1 were tested for the AFLP analysis, and the combinations E-AAG/M-CTC, E-ACT/M-CTT and E-ACC/M-CTT were selected. These selective AFLP combinations revealed 485 informative loci in total, and the combination E-ACC/M-CTT detected the greatest number of informative loci (49%). The analysis of dissimilarity frequency distribution showed that the distribution was uniform, ranging from 0.1285 to 0.7310 with a mean of 0.4801, and the accessions with indeterminate growth habits exhibited greater variability than the accessions with determinate growth habits. The clustering UPGMA, PCoA and Bayesian analyses showed the formation of two large clusters, wherein there is a possible association between snap bean growth habit and gene pool. The determinate accessions may be more closely associated with the Andean gene pool, while the indeterminate ones may be associated with the Mesoamerican gene pool. The Bayesian analysis showed accessions intermediate to both groups, suggesting introgression between the Andean and Mesoamerican gene pools.

Avaliação das políticas habitacionais na Região Metropolitana de Londrina-PR

O artigo apresenta a interpretação de resultados parciais da pesquisa “Direito à Moradia: aplicabilidade e efetividade dos instrumentos jurídicos na Região Metropolitana de Londrina-PR” iniciada em 2012 pela Universidade Estadual de Londrina. O contexto da produção de habitação de interesse social em Londrina, a partir dos anos de 1980 fornece subsídio de análise e reflexão sobre a operacionalização da política de habitação de interesse social no município, com destaque para os programas da década de 2000, em especial com a implantação do Residencial Vista Bela pelo Programa Minha Casa Minha Vida, um dos maiores conjuntos habitacionais do Brasil, entregue à população nos anos de 2011 e 2012.

Armazenamento e descarte de medicamentos por acadêmicos da área da saúde de uma universidade pública paranaense

Os medicamentos são ferramentas imprescindíveis para o estabelecimento da saúde e requerem cuidados quanto ao seu armazenamento e descarte. Este estudo teve como objetivo verificar a forma de armazenamento e descarte de medicamentos por estudantes da área da saúde de uma universidade pública paranaense. Realizou-se um estudo transversal com os estudantes dos cursos de Enfermagem, Farmácia e Medicina da Universidade Estadual de Londrina, por meio da aplicação de um questionário auto respondível. A coleta de dados foi executada nas salas de aula da própria universidade entre os meses de maio a junho de 2014, resultando em 564 estudantes entrevistados. Considerou-se descarte correto quando o estudante referisse destinar os medicamentos vencidos ou inapropriados ao uso em locais que fazem o recolhimento destes produtos. Os estudantes apresentaram idade média de 21,0 anos (desvio padrão: 3,3); sendo 74,1% do sexo feminino. O quarto foi o principal local citado para o armazenamento dos medicamentos (47,8%), sendo que a maioria os mantém fora do alcance das crianças (82,6%). Quanto à verificação do prazo de validade, 60,1% dos estudantes realizam esta prática. A maioria (64,5%) guarda as sobras de tratamentos para futura utilização, sendo o lixo doméstico (63,0%) o principal local citado para o descarte dos que estão vencidos. Apenas 20,7% descartavam os medicamentos corretamente. A população em estudo realiza um correto armazenamento dos medicamentos, no entanto, grande parte desconhece a existência de locais de recolhimento e promove o descarte inadequado dos mesmos, assim, faz-se necessário a criação de medidas para conscientização e orientação dos futuros profissionais.

Permeabilidade de Solo Laterítico por Diferentes Métodos

<p>Permeabilidade é uma propriedade de extrema importância para dimensionamento de diferentes tipos de obras de engenharia e é quantificada através do coeficiente de permeabilidade. Apesar do grande uso, ainda existem questionamentos sobre a melhor forma de determinação do coeficiente de permeabilidade. As principais questões são: (1) o tipo de método a ser utilizado e (2) a representatividade de amostras em solos tropicais. Neste contexto, objetivou-se neste trabalho a avaliação da permeabilidade de um solo laterítico, através da comparação de valores de coeficiente de permeabilidade determinados por ensaios in situ e em laboratório. Para tanto, escolheu-se o solo laterítico do Campo Experimental de Engenharia Geotécnica (CEEG) da Universidade Estadual de Londrina (UEL) e quatro equipamentos: permeâmetro de Carga Constante, permeâmetro de Carga Variável, permeâmetro de Guelph e Infiltrômetro. Os resultados mostram que, com exceção do permeâmetro de Carga Constante, todos os métodos apresentaram valor médio de coeficiente de permeabilidade da ordem de 10<sup>-3</sup> cm/s para coeficientes de variação de 37% a 92%. A heterogeneidade da estrutura do solo laterítico (em macro e microporos) é o provável condicionante da variabilidade encontrada.</p>