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33 results on '"Blanco, Daniel R."'

3. High rDNA polymorphisms in Astyanax lacustris (Characiformes: Characidae): new insights about the cryptic diversity in A. bimaculatus species complex with emphasis on the Paraná River basin

Author

Tonello, Sandro, primary, Blanco, Daniel R., additional, Cerqueira, Fiorindo J., additional, Lira, Natália L., additional, Traldi, Josiane B., additional, Pavanelli, Carla S., additional, Margarido, Vladimir P., additional, Gavazzoni, Mariane, additional, Pupo, Marcos V., additional, and Lui, Roberto L., additional

Published
2022
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4. A New Variant B Chromosome in Auchenipteridae: The Role of (GATA)n and (TTAGGG)n Sequences in Understanding the Evolution of Supernumeraries in Trachelyopterus

Author

Felicetti, Denise, primary, Haerter, Chrystian A.G., additional, Baumgärtner, Lucas, additional, Paiz, Leonardo M., additional, Takagui, Fábio H., additional, Margarido, Vladimir P., additional, Blanco, Daniel R., additional, Feldberg, Eliana, additional, da Silva, Maelin, additional, and Lui, Roberto L., additional

Published
2021
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5. Chromosomal distribution of the retroelements Rex1, Rex3 and Rex6 in species of the genus Harttia and Hypostomus (Siluriformes: Loricariidae)

Author

Traldi, Josiane B., Lui, Roberto L., Martinez, Juliana de F., Vicari, Marcelo R., Nogaroto, Viviane, Filho, Orlando Moreira, and Blanco, Daniel R.

Subjects
Biodiversity, Taxonomy
Abstract

Traldi, Josiane B., Lui, Roberto L., Martinez, Juliana de F., Vicari, Marcelo R., Nogaroto, Viviane, Filho, Orlando Moreira, Blanco, Daniel R. (2019): Chromosomal distribution of the retroelements Rex1, Rex3 and Rex6 in species of the genus Harttia and Hypostomus (Siluriformes: Loricariidae). Neotropical Ichthyology 17 (2): 1-10, DOI: 10.1590/1982-0224-20190010

Published
2019

8. A New Variant B Chromosome in Auchenipteridae: The Role of (GATA)n and (TTAGGG)n Sequences in Understanding the Evolution of Supernumeraries in Trachelyopterus.

Author

Felicetti, Denise, Haerter, Chrystian A.G., Baumgärtner, Lucas, Paiz, Leonardo M., Takagui, Fábio H., Margarido, Vladimir P., Blanco, Daniel R., Feldberg, Eliana, da Silva, Maelin, and Lui, Roberto L.

Subjects
CHROMOSOMES, BIOLOGICAL evolution, WATERSHEDS, CYTOGENETICS, MARSHES
Abstract

Basic and molecular cytogenetic techniques were carried out in 3 Neotropical region populations of catfishes, two of Trachelyopterus galeatus (one from the marshlands of Paraguay River basin and another from Lago Catalão, Amazon River basin) and one of Trachelyopterus porosus, a sympatric population to T. galeatus from the Amazon River basin. This study aimed to describe and understand the structure and evolution of Trachelyopterus B chromosomes, mainly through physical mapping of repetitive elements. A diploid number of 58 chromosomes was found for all individuals, as well as the presence of B chromosomes. For T. porosus this is the first report of a supernumerary. The sympatric species of T. galeatus and T. porosus from Amazon River had 1–3 B chromosomes and T. galeatus from Paraguay River had 1–2 B chromosomes, all of them showed intra- and interindividual numerical variation. Two females of T. porosus exhibited a new variant B chromosome (B2), previously not seen in Auchenipteridae, which might have originated from B1 chromosomes. All B chromosomes were entirely heterochromatic. In contrast to all complement A and B2 chromosomes, in which the telomeric sequences were found in the telomeric regions, B1 chromosomes of all populations were totally marked by (TTAGGG)n probes. (GATA)n sequence sites were found through all complement A chromosomes, but B1 and B2 chromosomes exhibited only a clustered block in one of the chromosome arms. The most frequent B chromosomes (B1) in all populations/species, including those previously studied in Auchenipteridae catfishes, share the following characteristics: totally heterochromatic, small, metacentric, with accumulation of repetitive (TTAGGG)n sequences, and a low number of (GATA)n copies, which might suggest a common ancient origin in Trachelyopterus species/populations. [ABSTRACT FROM AUTHOR]

Published
2021
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20. Two-meter telescopes for the new millennium

Author

Smith, Craig H., primary, Randall, Lawrence K., additional, Greene, Benjamin I., additional, Blanco, Daniel R., additional, Cook, Bruce H., additional, Little, John K., additional, Loeff, Adrian, additional, Meeks, Robert L., additional, and Pentland, Gordon, additional

Published
2000
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22. Progress at the Vatican Advanced Technology Telescope

Author

West, Steve C., primary, Nagel, Robert H., additional, Harvey, David A., additional, Brar, A., additional, Phillips, B., additional, Ray, J., additional, Trebisky, Thomas J., additional, Cromwell, Richard H., additional, Woolf, Neville J., additional, Corbally, Chris, additional, Boyle, R., additional, Blanco, Daniel R., additional, and Otten, L., additional

Published
1997
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28. MMT conversion: a status report.

Author

Chaffee, Frederic H., Blanco, Daniel R., Foltz, Craig B., Janes, Clinton C., Lester, Howard N., Poyner, Anthony D., Williams, Joseph T., Criswell, Stephen C., Fabricant, Daniel G., and Schmidt, Gary D.

Published
1990
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31. Comparative cytogenetics of three populations from the Rhamdia quelenspecies complex (Siluriformes, Heptapteridae) in two Brazilian hydrographic basins

Author

Martinez, Juliana F., Lui, Roberto L., Blanco, Daniel R., Traldi, Josiane B., Silva, Luciana F., Venere, Paulo C., Souza, Issakar L., and Moreira-Filho, Orlando

Abstract

AbstractAmong the more than 30 families of the order Siluriformes, Heptapteridae is composed of 189 species distributed into 24 genera. Rhamdia, which has wide distribution throughout the Neotropical region, presents only 11 valid species, with 8 being in the Brazilian territory. Rhamdia quelenis the only species considered as widely distributed in almost all Brazilian hydrographic basins. It is a Neotropical fish species with a confusing taxonomical history. Classic and molecular cytogenetics data for three populations of this species from two large Brazilian hydrographic basins (Paraná and Araguaia) are presented here. The diploid number found for the three analyzed populations was 58 chromosomes, but with distinct karyotypic formulae. The presence of B chromosomes was detected in the two Araguaia River populations with intra- and interindividual variation. C-banding evidenced little heterochromatin in the three analyzed populations. FISH with 18S rDNA probes evidenced a single chromosome pair bearing this site, confirming the presence of simple NORs, as visualized through silver nitrate staining. The site of 5S rDNA was observed in only one pair of chromosomes, but differing in the marked pair and their location. Based in the differences of the karyotypic formulae and rDNA 5S found between populations on this study and many others available in the literature, it is suggested that this group represents a species complex, and that a new and detailed taxonomical review is necessary.

Published
2011
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