RESUMO Convolvulaceae é uma família cosmopolita pertencente à ordem Solanales, que abrange cerca de 1.880 espécies distribuídas em 60 gêneros. O gênero Ipomoea L. é o mais representativo, com cerca de 700 espécies ao redor do globo. Considerando-se a importância ecológica e econômica aliada à escassez de estudos sobre este gênero, especialmente para o Estado da Paraíba, o presente estudo teve por finalidade apresentar o levantamento taxonômico de Ipomoea na mesorregião agreste do Estado da Paraíba, nordeste brasileiro. Foram registradas 20 espécies, sendo I. decipiens e I. squamosa registradas pela primeira vez para a área de estudo, essa última também constituindo um novo registro para a vegetação de Caatinga. São fornecidos descrições, chave de identificação, dados de distribuição e habitat, e/fenologia, comentários adicionais e imagens das espécies.

ABSTRACT Convolvulaceae is a cosmopolitan family belonging to the order Solanales, which covers about 1,880 species in 60 genera. Ipomoea L. is the most representative genus, with some 700 species worldwide. Considering the ecological and economic importance associated with the scarcity of studies on this genus, especially in Paraíba State, this study had the purpose of presenting the taxonomic survey of Ipomoea in the Agreste Mesorregion of Paraíba State, in northeastern Brazil. Twenty species were recorded, being I. decipiens and I. squamosa recorded for the first time in the study area, the latter also constituting a new record for the Caatinga vegetation. Descriptions, identification key, habitat and distribution data, phenology, additional comments and images of the species are provided.

Seamless steel pipes for application in the oil and gas industries are manufactured from quenched and tempered steel. Aiming to meet the required characteristics, it is necessary that the microstructure and the mechanical properties are homogeneous along the wall thickness of the pipes, which is even more critical for thick wall pipes. Considering the seamless steel pipe manufacturing process, any chemical segregation along the thickness could affect the phase transformation kinetics during heat treatments and, consequently, microstructure and mechanical properties. In this context, this pioneer work when evaluating the effect of the chemical homogeneity of a seamless pipe on the mechanical properties and phase transformations. The studied pipe was manufactured by a C-Mn steel designed for oil and gas industry applications. Two regions of the pipe wall were analyzed - a region close to the inner surface and another near the outer surface. The steel was subjected to quenching and tempering heat treatments. Scanning electron and optical microscopy techniques were used to characterize the resultant microstructures. Microhardness and Charpy impact tests were performed aiming to analyze the pipe mechanical behavior in the studied regions. In addition, dilatometric tests were performed in order to determine the continuous cooling transformation diagrams of these regions.