Pesquisa e Ensino em Ciências Exatas e da Natureza is a peer-reviewed, free-access multidisciplinary electronic journal with no publication fees edited by a team of professors of the Academic Unit of Exact and Natural Sciences (UACEN) of the Professor Training Center (CFP) of the Federal University of Campina Grande (UFCG) – Cajazeiras campus – in the state of Paraíba, Brazil.The journal is directed primarily to the academic-scientific community and continually receives contributions for the publication of regular editions as well as thematic, special and/or supplementary editions.