ABSTRACT
Transposable elements are DNA sequences present in all the large phylogenetic groups, both capable of changing position within the genome and constituting a significant part of eukaryotic genomes. The mariner family of transposons is one of the few which occurs in a wide variety of taxonomic groups, including freshwater planarians. Nevertheless, so far only five planarian species have been reported to carry mariner-like elements (MLEs), although several different species have been investigated. Regarding the number of copies of MLEs, Girardia tigrina is the only planarian species in which this has been evaluated, with an estimation of 8,000 copies of the element per haploid genome. Preliminary results obtained in our laboratory demonstrated that MLE is found in a large number of different species of planarians, including terrestrial. With this in mind, the aim was to evaluate the occurrence and estimate the number of MLE copies in different planarian species collected in south Brazil. Twenty-eight individuals from 15 planarian species were analyzed. By using PCR and the hybridization of nucleic acids, it was found that MLE was present in all the analyzed species, the number of copies being high, probably over 10³ per haploid genome.
ABSTRACT
Material fecal de crianças na idade de zero ate 5 anos. diagnosticadas com GEA em um hospital de Manaus, foi estudado atraves de microscopia eletronica (ME) e enzima-imunoensaio (EIE). As amostras foram coletadas antes de qualquer tratamento medico no hospital. Dos 29 casos estudados, 12 mostraram positividade para rotavirus (41,4%). Dos 29 casos, 48,3% foram tratados com reidarataçao isolada, 31,0% com antibioticoterapia e 20,7% com quimioterapia. Dos 12 casos positivos, 3 foram tratados com antibioticos e 3 com quimioterapicos. A maior frequencia de rotavirus ocorreu em crianças com idade entre zero e 12 meses. Nesta faixa etaria, o maior numero de casos de GEA e rotavirus foi detectado entre o setimo e o decimo segundo mes