| heteropicnotic chromatin and nucleolar activity in meiosis and spermiogenesis of limnogonus aduncus (heteroptera, gerridae): a stained nucleolar organizing region that can serve as a model for studying chromosome behavior. | males of limnogonus aduncus were found to have the sex chromosome system x0 and chromosome number 2n = 23 (22a + x0). testis cells were stained with lacto-acetic orcein and silver nitrate so that changes in the morphology and degree of staining of the heteropicnotic chromatin and the nucleolar material could be observed during meiosis and spermiogenesis. these structures share the same nuclear position and could be seen until almost the end of spermiogenesis. a chromosome region stained with sil ... | 2008 | 19224457 |
| study of nucleolar behavior during spermatogenesis in martarega brasiliensis (heteroptera, notonectidae). | few cytogenetic studies have been undertaken using aquatic heteropterans and the nucleolar behavior of these insects has been described in only four species, limnogonus aduncus, brachymetra albinerva, halobatopsis platensis, and cylindrostethus palmaris. the nucleolus is a cellular structure related to biosynthetic activity and it exhibits a peculiar behavior in the heteropterans of the triatominae subfamily; it persists during all stages of meiosis. thus, this study aims to analyze spermatogene ... | 2015 | 26345830 |