RESUMO
We show that the native moss Hypnum cupressiforme can be used as a biomonitor of atmospheric microplastics (MPs). The moss was collected in seven semi-natural and rural sites in Campania (southern Italy) and was analyzed for the presence of MPs, according to standard protocols. Moss samples from all sites accumulated MPs, with fibers representing the largest fraction of plastic debris. Higher numbers of MPs and longer fibers were recorded in moss samples from sites closer to urbanized areas, likely as the results of a continuous flux from sources. The MP size class distribution showed that small size classes characterized sites having a lower level of MP deposition and a high altitude above sea level.
RESUMO
We have previously reported a molecular and cytogenetic characterization of three different 5S rDNA clusters in the sea urchin Paracentrotus lividus; this study, performed at DNA level only, lends itself as starting point to verify that these clusters could contain transcribed genes, then, to demonstrate the presence of heterogeneity at functional RNA level, also. In the present work we report in P. lividus ribosomes the existence of several transcribed variants of the 5S rRNA and we associate all transcribed variants to the cluster to which belong. Our finding is the first demonstration of the presence of high heterogeneity in functional 5S rRNA molecules in animal ribosomes, a feature that had been considered a peculiarity of some plants.
Assuntos
DNA Ribossômico/genética , Oócitos/metabolismo , Paracentrotus/genética , Paracentrotus/metabolismo , RNA Ribossômico 5S/genética , Ribossomos/genética , Animais , Sequência de Bases , Clonagem Molecular , Biologia Computacional , Dados de Sequência Molecular , Paracentrotus/crescimento & desenvolvimento , Reação em Cadeia da Polimerase , Polimorfismo Conformacional de Fita Simples , Homologia de Sequência do Ácido NucleicoRESUMO
An inexpensive Plexiglas apparatus which allows a simple and rapid preparation of horizontal polyacrylamide gels of different dimensions for different purposes, is described. Preparation of such gels is as easy and rapid as agarose gel preparation, and polymerized polyacrylamide gels are used to fractionate proteins or small DNA fragments using a common horizontal electrophoretic tank. This apparatus was used to electrophoretically fractionate proteins or DNA for immuno-blot analyses, particularly in the study of the allergenic response to Parietaria judaica pollen in senescence, for Southern-blot hybridizations and in the study of DNA polymorphisms.
