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| Registros recuperados: 87 | |
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| Pina-Neto,J.M.; Carrara,R.C.V.; Bisinella,R.; Mazzucatto,L.F.; Martins,M.D.; Sartoratto,E.; Yamasaki,R.. |
| The objective of the present study was to determine the frequency of somatic chromosomal anomalies and Y chromosomal microdeletions (azoospermia factor genes, AZF) in infertile males who seek assisted reproduction. These studies are very important because the assisted reproduction techniques (mainly intracytoplasmic sperm injection) bypass the natural selection process and some classical chromosomal abnormalities, microdeletions of AZF genes or some deleterious genic mutations could pass through generations. These genetic abnormalities can cause in the offspring of these patients male infertility, ambiguous external genitalia, mental retardation, and other birth defects. We studied 165 infertile men whose infertility was attributable to testicular problems... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Cytogenetics; Y microdeletions; Male infertility; Karyotype; Chromosome aberrations. |
| Ano: 2006 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2006000400017 |
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| Barranger, Audrey; Akcha, Farida; Rouxel, Julien; Brizard, Raphael; Maurouard, Elise; Pallud, Marie; Menard, Dominique; Tapie, N.; Budzinski, Helene; Burgeot, Thierry; Benabdelmouna, Abdellah. |
| Pesticides represent a major proportion of the chemical pollutants detected in French coastal waters and hence a significant environmental risk with regards to marine organisms. Commercially-raised bivalves are particularly exposed to pollutants, among them pesticides, as shellfish farming zones are subject to considerable pressure from agricultural activities on the mainland. The aims of this study were to determine (1) the genotoxic effects of diuron exposure on oyster genitors and (2) the possible transmission of damaged DNA to offspring and its repercussions on oyster fitness. To investigate these points, oysters were exposed to concentrations of diuron close to those detected in the Marennes-Oleron Basin (two 7-day exposure pulses at 0.4 and 0.6 μg... |
| Tipo: Text |
Palavras-chave: Herbicide; Diuron; Oyster; Genotoxicity; Comet assay; Cytogenetics. |
| Ano: 2014 |
URL: http://archimer.ifremer.fr/doc/00162/27311/25541.pdf |
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| Degrandi,Tiago Marafiga; Gunski,Ricardo José; Garnero,Analía del Valle; Oliveira,Edivaldo Herculano Correa de; Kretschmer,Rafael; Souza,Marcelo Santos de; Barcellos,Suziane Alves; Hass,Iris. |
| Abstract The distribution of 45S rDNA cluster in avian karyotypes varies in different aspects, such as position, number of bearer chromosomes, and bearers being macro- or microchromosomes. The present study investigated the patterns of variation in the 45S rDNA-bearer chromosomes of birds in order to understand the evolutionary dynamics of the cluster configuration and its contribution to the evolution of bird karyotypes. A total of 73 bird species were analyzed, including both published data and species for which rDNA-FISH was conducted for the first time. In most birds, the 45S rDNA clusters were located in a single pair of microchromosomes. Hence, the location of 45S rDNA in macrochromosomes, observed only in Neognathae species, seems to be a derived... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: FISH; Chromosome; Chromosome evolution; Cytogenetics; Aves. |
| Ano: 2020 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572020000400601 |
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| Siqueira,Sérgio; Aguiar Jr.,Odair; Pansonato,André; Giaretta,Ariovaldo A.; Strüssmann,Christine; Martins,Itamar; Recco-Pimentel,Shirlei M.. |
| A recent substantial rearrangement of the 882 described eleutherodactyline frog species has considerably improved the understanding of their systematics. Nevertheless, many taxonomic aspects of the South American eleutherodactyline species remain unknown and require further investigation using morphological, cytogenetic and molecular approaches. In this work, the karyotypes of the Brazilian species Ischnocnema juipoca (Atibaia and Campos do Jordão, SP), Barycholos cf. ternetzi (Uberlândia, MG, and Porto Nacional, TO), and Pristimantis crepitans (Chapada dos Guimarães and São Vicente, MT) were analyzed using Giemsa staining, Ag-NOR labeling, and C-banding techniques. All individuals had a diploid number of 22 chromosomes, but the Fundamental Numbers were... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Cytogenetics; Barycholos; Ischnocnema; Pristimantis; Ag-NOR; C-banding. |
| Ano: 2009 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572009000300008 |
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| García,Ana M.; Schrauf,Gustavo E.; González,Graciela; Poggio,Lidia; Naranjo,Carlos A.; Dupal,Marck P.; Spangenberg,Germán C.; Forster,John W.. |
| Bromus setifolius var. pictus (Hook) Skottsb., B. setifolius var. setifolius Presl. and B. setifolius var. brevifolius Ness are three native Patagonian taxa in the section Pnigma Dumort of the genus Bromus L. AFLP and RAPD analysis, in conjunction with genetic distance measurements and statistical techniques, revealed variation within this group and indicated that B. setifolius var. brevifolius was closely related to B. setifolius var. pictus, with both taxa being more distantly related to B. setifolius var. setifolius. Cytogenetic analysis confirmed the chromosomal number of B. setifolius var. pictus (2n = 70) and B. setifolius var. setifolius (2n = 28) and showed for the first time that B. setifolius var. brevifolius had 2n = 70. The combination of... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: AFLP; Argentina; Bromus setifolius complex; Cytogenetics; Patagonia; RAPD. |
| Ano: 2009 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572009000200018 |
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| Registros recuperados: 87 | |
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