24 research outputs found
Características anátomo-estruturais da pele de ovinos (Ovis áries L.) lanados e deslanados, relacionadas com o aspecto físico-mecânico do couro
Reversible decreases in the bulk elastic modulus of mature leaves of deciduous Quercus species subjected to two drought treatments
Efeitos da poluição por petróleo na estrutura da folha de Podocarpus lambertii Klotzsch ex Endl., Podocarpaceae Effects of oil pollution on leaf structure of Podocarpus lambertii Klotzsch ex Endl., Podocarpaceae
Podocarpus lambertii, popularmente conhecida como pinheiro-bravo é uma Podocarpaceae típica da região Sul do Brasil, família que se distingue de outras coníferas por possuir uma estrutura de suporte para o óvulo denominada "epimatium". O presente estudo teve como objetivo investigar, por meio de parâmetros morfológicos e anatômicos, os efeitos da poluição por petróleo na estrutura das folhas de Podocarpus lambertii Klotzsch ex Endl. (Podocarpaceae), popularmente conhecida por pinheiro-bravo. As folhas foram coletadas no município de Araucária, Paraná, Brasil, na Refinaria de petróleo Presidente Getúlio Vargas (REPAR) um ano após exposição à poluição provocada pelo derramamento de petróleo. Esta espécie foi selecionada, porque além de ser nativa, apresentou um comportamento diferenciado dentre as demais diante da poluição. Folhas de nove indivíduos (seis expostos ao petróleo e três controle) foram coletadas. Foram avaliadas em microscopia fotônica as dimensões foliares (comprimento, largura e área foliar), a espessura dos tecidos e a densidade estomática. Os dados obtidos foram analisados estatisticamente. Nos indivíduos expostos à poluição, a superfície foliar foi menor, a densidade estomática e espessura dos tecidos foliares foram maiores quando comparados aos indivíduos controle. Os resultados obtidos permitem concluir que P. lambertti reagiu quando de sua exposição à poluição por petróleo.<br>Podocarpus lambertii, locally known as "pinheiro-bravo", is a typical Podocarpaceae from Southern Brazil. This family is the most diverse of conifers; it has a distinguishing characteristic, namely the presence of an ovule support structure, called an epimatium. The aim of this study was to investigate the effect of oil pollution on the leaf structure of P. lambertii through morphology and anatomy. Leaves were collected in Araucária Municipality, Paraná, Brazil, at the Presidente Getúlio Vargas Petroleum Refinery one year after they had been exposed to pollution by an oil spill. This species was studied because besides being a native species, it behaved differently from the other species when faced with pollution. Nine individuals were selected (six exposed to pollution and three controls). We analyzed the leaf surface (length, width and leaf area), tissue thickness and stomatal density using light microscopy. The data were statistically analyzed. Leaf anatomy was rather variable. The individuals that were exposed to pollution had smaller leaf surfaces, while stomatal density and thickness of leaf tissues were greater when compared to the control
Efficient Irrigation Water Management in Sugarcane Through Alteration of Field Application Parameters Under Subtropical India
Organization-Level Mentoring and Organizational Performance Within Substance Abuse Centers
Individual benefits to those who have been mentored are well documented. The present study demonstrates that organization-level mentoring relates to overall organizational performance. In a study of 589 employees of 39 substance abuse treatment agencies, the authors found that agencies with a greater proportion of mentored employees also reported greater overall agency performance. Organization-level mentoring also related to organization-level job satisfaction, organization-level organizational citizenship behavior, and organization-level learning. Results provide justification for organizational investment of time and resources into efforts designed to facilitate mentoring, as well as support the notion that mentoring may provide a competitive advantage to organization