Ag-NORs

Dynamics of chromosomal evolution in the genus Hypsiboas (Anura: Hylidae)

M. A. Carvalho, Rodrigues, M. T., Siqueira, S., and Garcia, C., Dynamics of chromosomal evolution in the genus Hypsiboas (Anura: Hylidae), vol. 13, pp. 7826-7838, 2014.

Hylidae is one of the most species-rich families of anurans, and 40% of representatives in this group occur in Brazil. In spite of such remarkable diversity, little is known about this family and its taxonomical and systematic features. Most hylids have 2n = 24, even though most of the cytogenetic data are mainly obtained based on the conventional chromosomal staining and are available for only 16% of Hypsiboas species, a genus accounting for about 10% of the hylid diversity.

Identification of naturalized goat breeds under conservation from northeastern Brazil using chromosomal markers

R. P. Santos, Affonso, P. R. A. M., Diniz, D., Medrado, A. S., Silva, K. M., and Carneiro, P. L. S., Identification of naturalized goat breeds under conservation from northeastern Brazil using chromosomal markers, vol. 12, pp. 3193-3200, 2013.

In order to provide the first cytogenetic data of naturalized and threatened goat breeds from northeastern Brazil, cytogenetic analyses were carried out in individuals of Repartida and Moxotó breeds raised in Bahia and Ceará States. Males and females of both breeds had 2n = 60, with 29 autosomal acrocentric pairs plus the sex chromosome pair. The number of nucleolar organizer region (NOR)-bearing chromosomes ranged from 6 to 8 per metaphase in Moxotó and Repartida goats, respectively.

Preponderance of GC-rich sites in silver-stained nucleolus organizing regions of Rita rita (Hamilton) and Mystus gulio (Hamilton) (Bagridae, Pisces), as revealed by chromomycin A3-staining technique and scanning electron microscopic studies

J. K. Das and Khuda-Bukhsh, A. R., Preponderance of GC-rich sites in silver-stained nucleolus organizing regions of Rita rita (Hamilton) and Mystus gulio (Hamilton) (Bagridae, Pisces), as revealed by chromomycin A3-staining technique and scanning electron microscopic studies, vol. 6, pp. 284-291, 2007.

The karyotypes of two species of catfish, Rita rita (Hamilton) (2n = 54; 14m + 34sm + 6st; NF = 102) and Mystus gulio (Hamilton) (2n = 58; 30m + 12sm + 2st + 14t, NF = 100) were studied through Giemsa-, silver- and chromomycin A3-staining techniques. The silver-stained karyotypes in both sexes of R. rita and M. gulio revealed that the nucleolus organizing regions were located terminally at the shorter arms (Tp) of one pair of submetacentric chromosomes, placed at positions Nos.

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