Universidade Estadual de Londrina

About: Universidade Estadual de Londrina is a education organization based out in Londrina, Brazil. It is known for research contribution in the topics: Population & Context (language use). The organization has 13052 authors who have published 19291 publications receiving 212123 citations.

Comunidades de machos de abelhas Euglossina (Hymenoptera: Apidae) em fragmentos florestais no Sul do Brasil

Abstract: O objetivo deste trabalho foi estudar as comunidades de abelhas Euglossina em tres fragmentos de floresta semidecidua de tamanhos diferentes (8,5 ha, 86 ha e 2280 ha), na regiao de Londrina, norte do Parana. De novembro de 2001 a abril de 2002, machos atraidos as iscas-odores de eucaliptol, eugenol e vanilina foram amostrados em coletas mensais, com 2h de duracao. Foram coletados 245 individuos pertencentes a quatro generos e sete especies. No fragmento maior foram coletados 152 machos pertencentes a seis especies, no medio, 45 machos de cinco especies e, no menor, 48 machos de sete especies. Os indices de diversidade (H') e equidade de especies (J') variaram de 1,21 a 1,42 e 0,62 a 0,86, respectivamente. A ordem de abundância das especies variou nos tres locais. Aparentemente, a reducao no tamanho dos fragmentos afetou negativamente a abundância de Eufriesea violacea Blanchard, a qual foi a especie mais comum (43,4%) no fragmento maior e a quarta (8,3%) em ordem de abundância no fragmento menor. Os resultados sugerem a necessidade de se manter areas grandes de florestas para uma melhor conservacao de populacoes desta e provavelmente de outras especies de Euglossina.

Relationships among arbuscular mycorrhizas, root morphology and seedling growth of tropical native woody species in southern Brazil

Abstract: The relationships between arbuscular mycorrhizal fungi and root morphological characteristics were studied under greenhouse conditions of 78 tropical native woody species and 47 seedling species collected in the field. Seedlings of native woody pioneer and early secondary species that generally exhibited fine roots with a dense cover of long root hairs showed higher mycorrhizal response and root mycorrhizal colonization than late-secondary and climax species with coarse roots with a sparse cover of short root hairs. Root-hair length and incidence decreased with the progression among the successional groups while fine-root diameter increased, both in the greenhouse and in the field. The mycorrhizal response was highly correlated to root mycorrhizal colonization in the greenhouse and in the field. These parameters were inversely correlated with the seed mass and fine-root diameter, but directly correlated with root-hair incidence, both in the greenhouse and in the field. Mycorrhizal response and root mycorrhizal colonization were also directly correlated with the root-hair length and root/shoot ratio of uninoculated plants. The seedling mycorrhizal status of the early successional woody species suggests that the root traits of these fast-growing species can be more receptive to attraction, infection and colonization by arbuscular mycorrhizas than root traits of late-successional species.

Oficinas de prevenção em um serviço de saúde para adolescentes: espaço de reflexão e de conhecimento compartilhado

Abstract: O artigo analisa resultados e limites de um projeto de extensao universitaria realizado em um servico publico de saude com atendimento integral ao adolescente. O projeto foi desenvolvido atraves de metodologia participativa, envolveu academicos e profissionais das areas de saude e humanas, respondendo a necessidade de se realizar trabalhos de prevencao com adolescentes. O projeto justifica-se pelo aumento dos indices de gravidez nao planejada entre meninas; pelos indices de infeccao de DST e Aids; e pelo uso de drogas. Programas de saude e o cumprimento dos conteudos dos Parâmetros Curriculares Nacionais do MEC poderiam atuar para minimizar a vulnerabilidade sociocultural de jovens. Oficinas de prevencao possibilitaram melhor interacao entre os profissionais do servico e os adolescentes, alem de representarem um espaco de reflexao sobre assuntos relacionados a sexualidade, temas dificilmente discutidos com a familia ou na escola. As oficinas apresentam-se, portanto, como instrumentos eficazes de prevencao e de promocao a saude, podendo ser operacionalizadas, nos servicos de saude, por equipes interdisciplinares.

Physical, antimicrobial and antioxidant properties of starch-based film containing ethanolic propolis extract

Abstract: Summary Propolis is a natural product that meets the requirements as functional additive for food packaging due to its antioxidant and antimicrobial activities. In this work, ethanolic propolis extract (EPE) was incorporated in cassava starch films, and characterisations with respect to their microstructure, mechanical properties, water vapour permeability (WVP), moisture sorption kinetics as well as antimicrobial and antioxidant capacities were performed. The results showed that tensile strength was not affected (P > 0.05) by the presence of EPE but Young's modulus decreased about 50% when compared to control films possibly because of EPE plasticiser effect. When 1% EPE was used, changes in moisture sorption properties were detected by a slightly hydrophobic character at films WVP. When extracted from the films, propolis retained its antioxidant activity. The films exhibited antimicrobial activity against Staphylococcus aureus and Escherichia coli even at low EPE concentrations (0.5%) mainly due to its phenolic compounds.