| morphological differentiation and possible origin of b chromosomes in natural brazilian population of astyanax scabripinnis (pisces, characidae). | specimens of astyanax scabripinnis from three different altitudes (1920, 1800 and 700 m) along the ribeirão grande stream in the campos do jordão region (são paulo state, brazil) were investigated. the same diploid number, 2n = 50, was detected in the three populations, with the following karyotypic constitution: 6m, 22sm, 10st and 12a. the populations located at 1920 and 1800 m altitude presented a high incidence of b chromosomes varying in number (0-2), shape (meta- and submetacentrics), size ... | 2000 | 11294607 |
| astyanax scabripinnis (pisces: characidae) hemoglobins: structure and function. | electrophoretic patterns of hemoglobins, root effect, bohr effect in blood and stripped hemoglobin, hb-o2 affinity gtp modulation of astyanax scabripinnis (lambari), caught at three different altitudes in ribeirão grande, near campos do jordão (são paulo), are described. all populations showed the same electrophoretic patterns: two cathodal components in starch gel. normal bohr effect values were found in these three populations both in blood (phi = -0.11) and stripped hemoglobin (phi = -0.12). ... | 2003 | 12659008 |
| nadp-dependent isocitrate dehydrogenase of astyanax scabripinnis (pisces, characidae) from three altitudes at grande stream, campos do jordão, sp. | electrokinetic, thermic, and kinetic properties of products of nadp-dependent isocitrate dehydrogenase (idhp; ec 1.1.1.42) loci of astyanax scabripinnis (pisces, characidae) collected at three different altitudes (700 m, 1,800 m, and 1,920 m) of grande stream at campos do jordão, state of são paulo, brazil, were analyzed. two idhp bidirectionally divergent loci, a single skeletal muscle, the idhp-a*, and a single liver idhp-b*, both polymorphic, were detected in the three different altitude popu ... | 2004 | 15462301 |
| chromosome polymorphism in astyanax fasciatus (teleostei, characidae). 2--chromosomal location of a satellite dna. | studies about composition of repetitive sequences and their chromosomal location have been helpful to evolutionary studies in many distinct organisms. in order to keep on assessing the possible relationships among different cytotypes of astyanax fasciatus (teleostei, characiformes) in the mogi-guaçu river (são paulo state, brazil), c-banding, chromomycin a(3) staining, and fluorescent in situ hybridization with a repetitive dna sequence (as51) isolated from astyanax scabripinnis were performed i ... | 2008 | 18931487 |