Distribuzione di fosfatasi alcaline in gonadi di Crostacei isopodi in rapporto al ciclo degli acidi nucleici

Summary The distribution of alkaline phosphatases has been studied in male and female gonads of some isopod crustaceans by means of Gomori's reaction.Monophosphatases are found on all Feulgen-positive nuclear structures, in the nucleolus and in the cytoplasm of young oocytes. They disappear from the cytoplasm in auxocytosis, during yolk formation, although they persist in the germinal vesicle. The authors think that the cytoplasmic localization is coincident with ribonucleic acid distribution.From the experiments related in the following note, nucleolar phosphatases appear to be in some way different from the nuclear (sensu stricto) and cytoplasmic phosphatases.Diphosphatases do not follow so closely the nucleic acid localization. They are absent from cytoplasm; in the nucleolus they are not distributed uniformly but show characteristic structure; in the nucleus they are not localized in the chromosomes but homogeneously diffused.