Species of Rineloricaria demonstrate an interesting evolutionary history from a cytogenetic point view, due to the occurrence extensive variation in diploid number (2n=36 -70 chromosomes), with Robertsonian rearrangements mostly responsible for this karyotypic diversity. In study we present data population pentamaculata, collected Itiz stream, tributary Paraná River Basin (Paraná, Brazil), whic...

The Qinghai–Tibet Plateau (QTP) is the highest and largest mountain plateau in world, which has become a focus area of amphibian biodiversity research conservation, depending on its large number endemic threatened species. Among 58 families Anura, only few species four (Megophryidae, Bufonidae, Dicroglossidae, Ranidae) are distributed QTP. Revealing genetic diversity these crucial for their env...

BACKGROUND Only a few patients who experience AML relapse derive lasting benefit from re-induction therapy. The utility of reassessing the disease karyotype at relapse is unclear. The main goals of this study were to identify prognostic factors for AML relapse and to determine the prognostic utility of karyotypic change between diagnosis and relapse as a variable for predicting response to salv...

Comparative cytogenetic studies are very useful in the characterization of different accessions same plant. The aimed this study was search for intraspecific karyotypic variability three species Passiflora genus using chromosomal conventional techniques (Giemsa staining and Fluorochromes base-specific) molecular technique as Fluorescent Situ Hybridization (FISH). diploid character observed all ...

Karyotypic diversity is critical to catalyzing change in the evolution of all plants. By resulting meiotic incompatibility among sets homologous chromosomes, polyploidy and aneuploidy may facilitate reproductive isolation potential for speciation. Across plants, karyotypic variants form allopolyploids receive greater taxonomic attention relative autopolyploids aneuploids. In particular, prevale...

Hybridization tests of the two karyotypic forms (Form A and B) of laboratory-raised, isolines of Anopheles vagus, were conducted by induced copulation. The results of reciprocal- and back-crosses indicated that they were genetically compatible, providing viable progeny. Comparative egg morphometry and morphology, aided by scanning electron microscopy (SEM), revealed that the eggs of the two kar...

Channid fishes, commonly referred to as "snakeheads", are currently very important in Asian fishery and aquaculture due to the substantial decline in natural populations because of overexploitation. A large degree of chromosomal variation has been found in this family, mainly through the use of conventional cytogenetic investigations. In this study, we analyzed the karyotype structure and the d...

Two populations of Astyanax altiparanae (Garutti & Britski, 2000) of the Água dos Patos stream/SP and lake Igapó/PR were analyzed. All individuals showed 2n = 50, however, different karyotypic formulae were observed. The population of the Água dos Patos stream showed 8m +24sm+6st+12a (NF=88) and the population of lake Igapó, 8m+28sm+4st+10a (NF=90). Nucleolus organizing regions (AgNORs) were ob...

Plectranthus is a genus which includes species of ornamental and medicinal potential. It faces taxonomic problems due to aggregating species previously belonging to the genus Coleus, a fact that has contributed to the existence of various synonymies. The species Plectranthus amboinicus, Plectranthus barbatus, Plectranthus grandis and Plectranthus neochilus are included in this context. Some aut...

The Iguazu river is a tributary of the left margin of the Paraná river, isolated from this basin about 22 million years ago with the appearance of the Iguazu Falls. The Iguazu river is characterized by high endemism due to two factors: its rugged topography and the old isolation caused by formation of the Iguazu Falls. This study analyzed cytogenetically a population of Glanidium ribeiroi colle...