Consulta: subjectFacets:"Chromosomes"
Registros recuperados: 50
Data/hora: 05/06/2024 16:06:07

CHROMOSOMES AND Ag-NOR LOCATION IN FLUVIATE POPULATIONS OF SALMO TRUTTA FARIO L. 1758 (SALMONIFORMES: SALMONIDAE) FROM ATACAMA DESERT, CHILE
Provedor de dados: 72
Autores: Northland-Leppe,Irma; Lam,Natalia; Jara-Seguel,Pedro; Capetillo-Arcos,Juana.
Salmo trutta fario L. 1758, presented a chromosome number 2n = 80 and a fundamental number NF = 100. Thehaploid chromosome set consists of seven metacentric chromosomes, three submetacentric, one subtelocentric and 29 telocentrics. The Ag-NOR are located at conserved position in the short arm of pair 11 (st), with the presence of additional NOR on the short arm of pair 9 (sm) which is rare in others taxa previously studied.
Tipo: Journal article
Palavras-chave: Salmo truttafario; Chromosomes; Atacama region; Chile.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382009000100007

KARYOTYPE STUDY IN THE SURF CLAM MESODESMA DONACIUM LAMARCK, 1818 (BIVALVIA: VENEROIDA: MESODESMATIDAE)
Provedor de dados: 72
Autores: Amar,Gabriel; Palma Rojas,Claudio; von Brand,Elisabeth; Jara-Seguel,Pedro.
Mesodesma donacium is a marine clam distributed from Sechura Bay (5°S) in northern Perú to Chiloé Island (43ºS) in southern Chile. Due to the commercial importance of this species, their populations have been reduced in the later years. In this work the karyotype morphology of M. donacium is described for the first time, to be additional to taxonomical, ecological, morphological, and reproductive antecedents previously documented for the species. M. donacium shows a diploid karyotype 2n = 38 with one metacentric, fifteen submetacentric and three subtelocentric chromosome pairs. The total haploid set length was 42.4 mm, and the mean chromosome size was 2.2 mm. M. donacium showed similitude in chromosome number with other species of the Veneroida order, but...
Tipo: Journal article
Palavras-chave: Veneroida; Mesodesmatidae; Cytogenetic relationshipt; Chromosomes; Karyotype morphology.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382008000100003

A new species of Telmatobufo (Schmidt 1852) (Anura, Calyptocephalellidae) from a remnant of the Maulino Forest, central Chile
Provedor de dados: 72
Autores: Cuevas,César C.
A new species, Telmatobufo ignotus, from the Reserva Nacional Los Queules, Cauquenes Province, central Chile is described herein. The new taxon is hypothesized based on a new combination of adult, larval, and chromosomal characters. The new species present the more septentrional distribution on the coastal range and a very restrictive distribution area compared to its congeners; because of this, taxonomic and conservation comments are discussed and advanced.
Tipo: Journal article
Palavras-chave: New species; Anura; Telmatobufo; Morphology; Chromosomes; Central Chile.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382010000200004

Cytogenetic studies in fishes of the genera Hassar, Platydoras and Opsodoras (Doradidae, Siluriformes) from Jarí and Xingú Rivers, Brazil
Provedor de dados: 74
Autores: Milhomem,Susana Suely Rodrigues; Souza,Augusto Cesar Paes de; Nascimento,Aline Lira do; Carvalho Jr.,Jaime Ribeiro; Feldberg,Eliana; Pieczarka,Julio Cesar; Nagamachi,Cleusa Yoshiko.
We studied the karyotypes of Hassar cf. orestis and an undescribed Hassar species from the Jarí River and Opsodoras ternetzi, H. orestis and Platydoras cf. costatus from the Xingú River, all with 2n = 58. Constitutive heterochromatin is located in the centromere in most metacentric pairs; in some chromosomes this banding is not present, or it is located on the whole chromosome arm or in the distal regions. The NOR is located on a single biarmed pair at a distal region of the short arm in H. cf. orestis, H. orestis and P. cf. costatus at a distal region of the long arm in O. ternetzi and at a proximal region of the long arm in the Hassar species. In all species (except for Hassar sp.) the CMA3 analysis revealed a rich G-C region coincident with the NOR....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Chromosomes; Amazon; Biodiversity; Siluriformes; Banding; Fluorochromes.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572008000200017

Karyotypic characterization of Hydromedusa tectifera (Testudines, Pleurodira) from the upper Iguaçu River in the Brazilian state of Paraná
Provedor de dados: 74
Autores: Noleto,Rafael Bueno; Kantek,Daniel Luis Zanella; Swarça,Ana Cláudia; Dias,Ana Lúcia; Fenocchio,Alberto Sergio; Cestari,Marta Margarete.
We present the karyotypic characterization of 26 specimens of the side-necked turtle Hydromedusa tectifera collected in the upper Iguaçu River, Paraná state, Brazil. The turtles were cytogenetically analyzed using Giemsa staining and other banding techniques (C, G, Ag-NOR and CMA3) as well as fluorescence in situ hybridization (FISH) with a rDNA 18S probe. All the specimens showed a diploid number of 58 composed of 22 macro and 36 microchromosomes. The Ag-NOR, CMA3 and FISH techniques permitted the identification and characterization of the chromosome pairs bearing nucleolus organizer regions (NORs), while G-banding facilitated a better recognition and pairing of macrochromosomes. These data agree with some information available in the literature and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Chromosomes; FISH; G-banding; Pleurodira; Turtle.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572006000200011

Nucleotide sequence, genomic organization and chromosome localization of 5S rDNA in two species of Curimatidae (Teleostei, Characiformes)
Provedor de dados: 74
Autores: Santos,Lessandra Viviane de Rosa; Foresti,Fausto; Wasko,Adriane Pinto; Oliveira,Claudio; Martins,Cesar.
The 5S ribosomal DNA (5S rDNA) of higher eukaryotes is organized in repeat units of tandem arrays composed of a 5S rDNA coding region, conserved even among non-related taxa, and a variable non-transcribed spacer sequence (NTS). To contribute to knowledge on the organization and evolution of vertebrate 5S rDNA we used PCR, nucleotide sequencing, Southern blot hybridization and chromosome fluorescence in situ hybridization (FISH) to investigate 5S rDNA tandem repeats in the South American Curimatidae fish Steindachnerina insculpta and Cyphocharax modesta. 5S rDNA repeats of 180 base pairs (bp) from both species were PCR-generated and sequenced evidencing the shortest 5S rDNA monomer so far described in eukaryote species. Southern blotting revealed that both...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cyphocharax modesta; Steindachnerina insculpta; 5S rDNA; Chromosomes; FISH; Nucleotide sequence.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572006000200009

Cytogenetic studies in six species of Scinax (Anura, Hylidae) clade Scinax ruber from northern and northeastern Brazil
Provedor de dados: 74
Autores: Nogueira,Lídia; Zanoni,Juliani Bruna; Solé,Mirco; Affonso,Paulo Roberto Antunes de Mello; Siqueira,Sérgio; Sampaio,Iracilda.
Scinax species are still underrepresented in cytogenetic studies, mainly with respect to populations from northeastern and northern Brazil. In this study, we provide new chromosomal information on Scinax boesemani, S. camposseabrai, S. garbei, S. pachycrus, S. trilineatus and S. x-signatus, all belonging to clade S. ruber. They were collected at two locations in the Caatinga biome (northeastern Brazil) and at one in the Amazon (northern Brazil) biomes. Chromosomes were analyzed by conventional staining, C-banding, Ag-NOR staining, and fluorochrome staining. All species shared a modal diploid value of 2n = 24 and fundamental arm number (FN) of 48. Moreover, both chromosomal size and morphology were similar to other species in this Scinax clade. C-banding...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Amphibians; Chromosomes; Fluorochromes; Heterochromatin; RDNA.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572015000200156

Cytogenetic analysis of three catfish species of the family Pseudopimelodidae (Teleostei, Siluriformes)
Provedor de dados: 74
Autores: Martinez,Emanuel Ricardo Monteiro; Nirchio,Mauro; Granado,Angel; Foresti,Fausto; Oliveira,Claudio.
Cytogenetic analyses performed in Cephalosilurus apurensis, Microglanis aff. cottoides and Pseudopimelodus bufonius revealed that the three species have 2n = 54 chromosomes: C. apurensis presented six metacentric (M), 28 submetacentric (SM), 14 subtelolocentric (ST), and six acrocentric (A) chromosomes, while M. aff. cottoides showed 10M, 32SM, 10ST and 2A, and P. bufonius had 12M, 30SM and 12ST. The nucleolus organizer regions (NORs) were present on the short arm of a middle-sized ST pair, identified as pair 19, in C. apurensis NORs were found on the short arm of a middle-sized ST (pair 23) and on the long arm of a middle-sized ST (pair 22) in M. aff. cotttoides and on the short arm of three middle-sized ST pairs, identified as pairs 9, 10 and 11, in P....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Karyotype; Chromosomes; C-banding; Ag-NOR; Fish.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572008000400015

The karyotype of the critically endangered Lear's macaw, Anodorhynchus leari Bonaparte 1856 (Aves, Psittaciformes)
Provedor de dados: 74
Autores: Nogueira,Denise Monnerat; Souza,Lucia Moreno de; Goldschmidt,Beatriz; Silva,Christiano Pinheiro da; Monsores,Denise Wilches.
We used conventional chromosomal staining to describe the karyotype of the critically endangered Lear's macaw, Anodorhynchus leari Bonaparte 1856. A diploid number of 2n = 70 and a karyotype similar to that of its congener Anodorhynchus hyacinthinus suggests that chromosomal rearrangements were not the main evolutionary mechanism in the genus.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Birds; Karyotype; Chromosomes; Psittaciformes; Endangered species.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572006000400014

First cytogenetic characterization of the sub-arctic marine fish Mallotus villosus (Müller, 1776), Osmeriformes, Osmeridae
Provedor de dados: 74
Autores: Ghigliotti,Laura; Mazzei,Federico; Ozouf-Costaz,Catherine; Christiansen,Jørgen S.; Fevolden,Svein-Erik; Pisano,Eva.
The capelin, Mallotus villosus (Osmeriformes, Osmeridae), is an ecological and commercial key component of the sub-arctic ichthyofauna. Here, we provide the first cytogenetic information on the species based on both conventional karyotyping and chromosomal mapping of 45S and 5S ribosomal genes through fluorescence in situ hybridization (FISH). The capelin genome displayed a diploid number of 54 with the karyotypic formula 26m/sm+28st/a and a fundamental number (FN) = 80. Both classes of ribosomal genes appeared to be spread out to multiple chromosomal locations, i.e. the 45S and 5S rDNA clusters were detected on six and seven chromosome pairs, respectively. A linked chromosomal organization of the major and minor ribosomal genes classes has been visualized...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Capelin; Chromosomes; Osmeridae; Ribosomal genes.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572008000200003

Multiple interstitial ribosomal sites (NORs) in the Brazilian squirrel Sciurus aestuans ingrami (Rodentia, Sciuridae) with 2n = 40: an overview of Sciurus cytogenetics
Provedor de dados: 74
Autores: Fagundes,Valéria; Christoff,Alexandre Uarth; Amaro-Ghilard,Renata Cecília; Scheibler,Daniel R.; Yonenaga-Yassuda,Yatiyo.
This is the first time the karyotype of the Brazilian squirrel Sciurusaestuans ingrami, with 2n = 40, is described. The karyotype of this species comprises 18 pairs of biarmed and one minute pair of acrocentric autosomes, a medium-sized submetacentric X and a medium-sized acrocentric Y. Four pairs have an interstitial secondary constriction, co-located with nucleolar organizer regions (NORs), identified by silver-staining technique and fluorescent in situ hybridization (FISH) with ribosomal 18S/28S probes. The occurrence of multiple interstitial NORs is rare in rodents, and this is one of the few examples, identified by a molecular cytogenetics approach.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Squirrels; Chromosomes; Karyotype; NORs; Rodentia.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572003000300007

Hypomethylation of cytosine residues in cold-sensitive regions of Cestrum strigilatum (Solanaceae)
Provedor de dados: 74
Autores: Guarido,Paula Carolina Paes; Paula,Adriano Alves de; Silva,Carlos Roberto Maximiano da; Rodriguez,Carmen; Vanzela,André Luís Laforga.
Heterochromatin comprises a fraction of the genome usually with highly repeated DNA sequences and lacks of functional genes. This region can be revealed by using Giemsa C-banding, fluorochrome staining and cytomolecular tools. Some plant species are of particular interest through having a special type of heterochromatin denominated the cold-sensitive region (CSR). Independent of other chromosomal regions, when biological materials are subjected to low temperatures (about 0 °C), CSRs appear slightly stained and decondensed. In this study, we used Cestrum strigilatum (Solanaceae) to understand some aspects of CSR condensation associated with cytosine methylation levels, and to compare the behavior of different heterochromatin types of this species, when...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Anti-5-methylcytosine; Cestrum; Chromosomes; CMA/DAPI banding; Heterochromatin; Immunolabeling.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572012000300012

Chromosome study of Anteaters (Myrmecophagideae, Xenarthra): a preliminary report
Provedor de dados: 74
Autores: Pereira Júnior,Hélio Rubens Jacintho; Jorge,Wilham; Costa,Maria Elvira Loyola Teixeira da.
Anteaters belong to the Order Xenarthra / Family Myrmecophagidae and are the only members without teeth. There are three genera with four living species in the family Myrmecophagidae: Myrmecophaga tridactyla (giant anteater), Tamandua tetradactyla (southern lesser anteater), Tamandua mexicana (northern lesser anteater), and Cyclopes didactylus (silky anteater). The karyotypes of M. tridactyla (2n = 60), T. tetradactyla (2n = 54) and C. didactylus (2n = 64) have already been described. In the present paper, three female and two male specimens of giant anteater and one lesser anteater male were analyzed. The results indicate the existence of a new karyotype in the genus Tamandua, with 2n = 56 chromosomes, which can represent a new lesser anteater species....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Anteater; Chromosomes; Myrmecophagidae.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572004000300014

Cytogenetic analysis of five Hypostomus species (Siluriformes, Loricariidae)
Provedor de dados: 74
Autores: Martinez,Emanuel Ricardo Monteiro; Zawadzki,Claudio Henrique; Foresti,Fausto; Oliveira,Claudio.
In this work, we analyzed the karyotypes of five species. Hypostomus cf. heraldoi, from the Mogi-Guaçu River, had 2n = 72 chromosomes, with a nucleolar organizer region (NOR) in one chromosomal pair. Hypostomus regani, from the Mogi-Guaçu River had 2n = 72 chromosomes with NORs in two chromosomal pairs. Hypostomus sp., from the Mogi-Guaçu River basin, had 2n = 68 chromosomes, with NORs in two chromosomal pairs. Hypostomus aff. agna, from Cavalo Stream, had 2n = 74 chromosomes with NORs in two chromosomal pairs. Hypostomus cf. topavae, from Carrapato Stream, had 2n = 80 chromosomes, with NORs in two chromosomal pairs. Hypostomus species showed marked diversity in the karyotypic formula, which suggested the occurrence of several Robertsonian rearrangements...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Chromosomes; Evolution; Hypostominae; Neotropical fish; NOR.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572011000400006

Chromosome studies of Brazilian vespertilionids Lasiurus cinereus and Lasiurus ega (Mammalia, Chiroptera)
Provedor de dados: 76
Autores: Marchesin,Sandra Regina de Carvalho; Versute,Eliana Morielle.
Cytogenetical studies based on conventional coloration by Giemsa, C-banding and Ag-NOR were performed on 2 species of bats from the vespertilionid family: Lasiurus cinereus (Beauvois, 1796) and Lasiurus ega (Gervais, 1856). The 2n was 28 and FN was 48 in both species. The constitutive heterochromatin is located in centromeric regions in the two species and in the short arm of the subtelocentric X chromosome in L. ega. NORs were observed in the secondary constriction of the smaller autosome in both species.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Chiroptera; Chromosomes; Lasiurus; C-banding; NORs.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0073-47212004000400016

Mitotic and meiotic chromosomes of a southern Brazilian population of Boophilus microplus (Acari, Ixodidae)
Provedor de dados: 76
Autores: Garcia,Rosane Nunes; Garcia-Fernandez,Casemiro; Garcia,Sonia Maria Lauer; Valente,Vera Lúcia S.
Using conventional staining with acetic orcein and C-banding techniques it was investigated constitutive heterochromatin chromosomal polymorphisms and the mitotic and the meiotic behavior of male and female chromosomes of Boophilus microplus (Canestrini, 1887). Some differences were detected in the population of southern Brazil as compared to the data of other authors for populations in other latitudes. The differences being mainly concerned with the distribution of constitutive centromeric heterochromatin and variation in the length of heterochromatic blocks in the pericentromeric regions of some chromosome pairs.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Arachnida; Acari; Chromosomes; C-banding; Boophilus.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0073-47212002000100004

Comparative cytogenetics in different populations of the cavernicolous diplopod Pseudonannolene strinatii (Diplopoda, Pseudonannolenidae)
Provedor de dados: 76
Autores: Campos,Kleber A.; Fontanetti,Carmem S.
Different populations of Pseudonannolene strinatii Mauriès, 1974 collected from three caves in Iporanga, state of São Paulo, were cytogenetically compared using techniques of conventional coloration, C-banding and silver nitrate impregnation. Specimens were morphologically similar and small cytogenetic differences were observed between the populations with relation to the distribution of constitutive heterochromatin.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Millipedes; C-banding; Karyotype; AgNOR; Chromosomes.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0073-47212013000100006

Etude des anomalies chromosomiques chez Crassostrea gigas - Contrat Région Poitou-Charentes 2000-2006. Convention 2003
Provedor de dados: 5
Autores: Bouilly, Karine; Bonnard, Marc; Grouhel, Stephanie; Lapegue, Sylvie.
Divers travaux menés depuis 1984 montrent qu’il existe, chez l’huître creuse Crassostrea gigas, des cellules présentant un nombre anormal de chromosomes (2n = 19, 18 ou même 17 au lieu de 2n = 20). Or, une corrélation négative entre l’aneuploïdie somatique et le taux de croissance a été décrite à de nombreuses reprises (Thiriot-Quiévreux et al., 1988, 1992 ; Leitão et al., 2001a ; Zouros et al., 1996). Bien que les causes environnementale et /ou génétique de l’aneuploïdie restent encore largement inconnues, des études récentes ont permis de poser l’hypothèse d’une base génétique large dans la détermination de ce caractère (Leitão et al., 2001b). De plus, un effet toxique direct de l’atrazine (herbicide couramment utilisé dans la région) sur le génome d’une...
Tipo: Text
Palavras-chave: Génétique; Chromosomes; Aneuploïdie; Huîtres creuses; Crassostrea gigas.
Ano: 2003
URL: http://archimer.ifremer.fr/doc/00044/15476/12855.pdf

Etude des anomalies chromosomiques chez Crassostrea gigas - Contrat de Plan Région Poitou-Charentes 2000-2006. Convention 2000
Provedor de dados: 5
Autores: Lapegue, Sylvie; Mccombie, Helen; Leitao, Alexandra; Bouilly, Karine; Sabatier, Sebastien; Heurtebise, Serge; Boudry, Pierre; Thiriot Quievreux, Catherine; Gerard, Andre.
Divers travaux menés depuis 1984 montrent qu’il existe, chez l’huître creuse Crassostrea gigas, des cellules montrant un nombre anormal de chromosomes (2n = 19, 18 ou même 17 au lieu de 2n = 20). Le niveau d’aneuploïdie est déterminé par le décompte des chromosomes à partir de suspensions cellulaires de tissu branchial. Le pourcentage de cellules aneuploïdes est toujours significativement supérieur dans les "lots de queue", c'est-à-dire les huîtres présentant des croissances plus faibles, et peut atteindre plus de 30 %. Récemment, une étude réalisée au sein du programme européen « Genephys » a démontré que plus de 50 % de la variance pour la vitesse de croissance était liée au taux d’aneuploïdie. Cependant, de nombreux points concernant ce phénomène...
Tipo: Text
Palavras-chave: Génétique; Chromosomes; Aneuploïdie; Huîtres creuses; Crassostrea gigas.
Ano: 2001
URL: http://archimer.ifremer.fr/doc/00043/15474/12853.pdf

Etude des anomalies chromosomiques chez Crassostrea gigas - Contrat Région Poitou-Charentes 2000-2006. Convention 2004
Provedor de dados: 5
Autores: Bouilly, Karine; Bonnard, Marc; Lapegue, Sylvie.
Des anomalies cytogénétiques, telles que l'aneuploïdie, sont connues pour être communes chez les bivalves (Ahmed et Sparks, 1970; Dixon, 1982; Thiriot- Quiévreux, 1986; Martínez-Expósito et al., 1992; Li et Havenhand, 1997). Ce phénomène, qui a pour origine principalement une non-disjonction des chromosomes pendant la mitose ou la méiose (Bond et Chandley, 1983; Martin et Rademaker, 1990), est souvent létal chez les animaux supérieurs tels que les mammifères ou bien associé à un retard de croissance (Vig et Sandberg, 1987). Chez Crassostrea gigas, l’aneuploïdie est l’altération du nombre diploïde normal de 20 chromosomes (Ahmed et Sparks, 1967; Thiriot-Quiévreux, 1984) en cellules hypodiploïdes avec 19, 18 ou 17 chromosomes (Thiriot-Quiévreux et al.,...
Tipo: Text
Palavras-chave: Génétique; Chromosomes; Aneuploïdie; Huîtres creuses; Crassostrea gigas.
Ano: 2004
URL: http://archimer.ifremer.fr/doc/00044/15477/12856.pdf

Etude des anomalies chromosomiques chez Crassostrea gigas
Provedor de dados: 5
Autores: Lapegue, Sylvie; Mccombie, Helen; Leitao, Alexandra; Bouilly, Karine; Sabatier, Sebastien; Heurtebise, Serge; Boudry, Pierre; Thiriot, Catherine; Gerard, Andre.
Divers travaux menés depuis 1984 montrent qu'il existe, chez l'huître creuse Crassostrea gigas, des cellules montrant un nombre anormal de chromosomes (2n = 19, 18 ou même 17 au lieu de 2n = 20). Le niveau d'aneuploïdie est déterminé par le décompte des chromosomes à partir de suspensions cellulaires de tissu branchial. Le pourcentage de cellules aneuploïdes est toujours significativement supérieur dans les "lots de queue", c'est-à-dire les huîtres présentant des croissances plus faibles, et peut atteindre plus de 30 %. Récemment, une étude réalisée au sein du programme européen « Genephys » a démontré que plus de 50 % de la variance pour la vitesse de croissance était liée au taux d'aneuploïdie. Cependant, de nombreux points concernant ce phénomène...
Tipo: Text
Palavras-chave: Génétique; Chromosomes; Anomalies; Aneuploïdie; Atrazine; Huîtres creuses; Crassostrea gigas.
Ano: 2002
URL: http://archimer.ifremer.fr/doc/00199/31013/29417.pdf

Etude des anomalies chromosomiques chez Crassostrea gigas. Contrat Région Poitou-Charentes 2000-2006. Convention 99
Provedor de dados: 5
Autores: Lapegue, Sylvie; Mccombie, Helen; Leitao, Alexandra; Heurtebise, Serge; Boudry, Pierre; Thiriot Quievreux, Catherine; Gerard, Andre.
Divers travaux menés depuis 1984 montrent qu’il existe, chez l’huître creuse Crassostrea gigas, des cellules montrant un nombre anormal de chromosomes (2n = 19, 18 ou même 17 au lieu de 2n = 20). Le niveau d’aneuploïdie est déterminé par le décompte des chromosomes à partir de suspensions cellulaires de tissu branchial. Le pourcentage de cellules aneuploïdes est toujours significativement supérieur dans les "lots de queue", c'est-à-dire les huîtres présentant des croissances plus faibles, et peut atteindre plus de 30 %. Récemment, une étude réalisée au sein du programme européen « Genephys » a démontré que plus de 50 % de la variance pour la vitesse de croissance était liée au taux d’aneuploïdie. Cependant, de nombreux points concernant ce phénomène...
Tipo: Text
Palavras-chave: Génétique; Chromosomes; Aneuploïdie; Huîtres creuses; Crassostrea gigas.
Ano: 2000
URL: http://archimer.ifremer.fr/doc/00043/15473/12852.pdf

Etude des anomalies chromosomiques chez Crassostrea gigas - Contrat Région Poitou-Charentes 2000-2006. Convention 2002
Provedor de dados: 5
Autores: Bouilly, Karine; Mccombie, Helen; Leitao, Alexandra; Lapegue, Sylvie.
Divers travaux menés depuis 1984 montrent qu’il existe, chez l’huître creuse Crassostrea gigas, des cellules montrant un nombre anormal de chromosomes (2n = 19, 18 ou même 17 au lieu de 2n = 20). Le niveau d’aneuploïdie est déterminé par le décompte des chromosomes à partir de suspensions cellulaires de tissu branchial. Le pourcentage de cellules aneuploïdes est toujours significativement supérieur dans les "lots de queue", c'est-à-dire les huîtres présentant des croissances plus faibles, et peut atteindre plus de 30 %. Cette corrélation négative entre l’aneuploïdie somatique et le taux de croissance a été décrite à de nombreuses reprises (Thiriot-Quiévreux et al., 1988, 1992 ; Leitão et al., 2001a ; Zouros et al., 1996). Bien que les causes...
Tipo: Text
Palavras-chave: Génétique; Chromosomes; Aneuploïdie; Huîtres creuses; Crassostrea gigas.
Ano: 2002
URL: http://archimer.ifremer.fr/doc/00044/15475/12854.pdf

Persistence of atrazine impact on aneuploidy in the Pacific oyster, Crassostrea gigas
Provedor de dados: 5
Autores: Bouilly, Karine; Mccombie, Helen; Leitao, Alexandra; Lapegue, Sylvie.
Aneuploidy is the alteration of the normal diploid chromosome number. In the Pacific oyster, Crassostrea gigas, hypodiploid aneuploid cells have regularly been reported as has a negative correlation between this phenomenon and growth and evidence for a genetic basis. We previously demonstrated a positive relationship between a pollutant, atrazine, and aneuploidy in Crassostrea gigas adults and juveniles. To evaluate the persistence of this impact, the present study focused on a sample of the same juveniles exposed to different atrazine treatments (0.01 mg/l which represents a peak value found in a polluted environment and 0.1 mg/l) for three and a half months and evaluated them for aneuploidy after another two and a half months in non polluted conditions....
Tipo: Text
Palavras-chave: Crassostrea gigas; Genetic; Pollutant persistence; Oyster culture; Marine molluscs; Herbicides; Cultured organisms; Chromosomes.
Ano: 2003
URL: http://archimer.ifremer.fr/doc/2003/acte-3344.pdf

Cytogenetics and redescription of Graomys (Rodentia, Sigmodontinae) from Chumbicha, Catamarca, Argentina
Provedor de dados: 81
Autores: Lanzone,Cecilia; Novillo,Agustina; Suárez,Natalia S.; Ojeda,Ricardo A.
The taxonomy, phylogenetic relationships and distribution of the genus Graomys are confusing. In this note we report karyotypic data for specimens of Graomys collected in Chumbicha, Catamarca Province, Argentina. Their karyotypes agree with G. centralis with 2n = 42. The individuals from Chumbicha are similar in morphology to G. griseoflavus but smaller. Our results suggest that Chumbicha's specimens are conspecific with G. medius. Moreover, we propose to synonymize G. medius with G. centralis. Other data of the genus suggest that the name G. chacoensis should be applied to specimens with 2n = 42.
Tipo: Info:eu-repo/semantics/report
Palavras-chave: Chromosomes; Morphometry; Phyllotine; Rodents; Taxonomy.
Ano: 2007
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0327-93832007000200009

Karyotypic characterization and new geographical record of Salinomys delicatus (Rodentia, Cricetidae, Sigmodontinae)
Provedor de dados: 81
Autores: Lanzone,Cecilia; Ojeda,Ricardo A.; Albanese,Soledad; Rodríguez,Daniela; Dacar,Mariana.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Chromosomes; Geographic range; Phyllotini; South American drylands.
Ano: 2005
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0327-93832005000200015

Cytogenetic description of Bunocephalus doriae Boulenger, 1902 (Siluriformes: Aspredinidae) from the Paraná River (Misiones, Argentina)
Provedor de dados: 83
Autores: Fenocchio,Alberto Sérgio; Swarça,Ana Cláudia.
In this work, Bunocephalus doriae was cytogenetically analyzed. A karyotype with a diploid number of 2n= 50 comprising 6m, 10sm, 6st, and 28a (FN= 72) chromosomes was observed. The occurrence of an asymmetric karyotype with a large number of acrocentric chromosomes distinguishes this species from others the Order Siluriformes. An exclusive character observed is the first pair of subtelocentric as the largest chromosome pair of the complement. NORs detected using AgNO3 were located in the terminal regions, on the short arm of a subtelocentric chromosome pair (pair 11), in a secondary constriction. C-banding revealed heterochromatic centromeric regions on several chromosomes of the complement after C-banding. This is the first cytogenetic description of this...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: AgNORs; C-banding; Chromosomes.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252012000200022

Surprising genomic diversity in the Neotropical fish Synbranchus marmoratus (Teleostei: Synbranchidae): how many species?
Provedor de dados: 83
Autores: Torres,Rodrigo Augusto; Roper,James Joseph; Foresti,Fausto; Oliveira,Claudio.
Chromosomes and nuclear DNA content variation in the eel Synbranchus marmoratus were studied in seven samples taken from rio Paraguay and rio Paraná basins to examine whether karyotype and nuclear DNA content variations could offer useful information for the characterization of independent evolutionary lineages in the genus and construction of evolutionary and biogeographical hypotheses. The occurrence of different karyotypes was already described for this species; however, a new cytotype from rio Miranda was discovered. Nuclear DNA content showed a wide variation among samples and individuals, ranging from 5.2 to 9.1 pg of DNA/nuclei. An analysis of variance confirmed the occurrence of significant differences among samples. In a deeper series of analyses,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Fish DNA; Chromosomes; Genome diversity; Karyotype; Synbranchus marmoratus.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252005000200005

Cytogenetic data on Astyanax jacuhiensis (Characidae) in the lago Guaíba and tributaries, Brazil
Provedor de dados: 83
Autores: Pacheco,Rosiley B.; Giuliano-Caetano,Lucia; Julio Junior,Horácio F.; Dias,Ana L.
Cytogenetic analyses were performed in Astyanax jacuhiensis from lago Guaíba, Brazil. The diploid number was 50, with a karyotype composed of 8m+30sm+4st+8a chromosomes, FN = 92. The AgNORs were observed in 2 to 5 chromosomes, with intra- and interindividual variation. The sm pair 8 observed always carried NORs on the short arms, presenting size heteromorphism between homologous. Fluorescence in situ hybridization (FISH) with an 18S rDNA probe only confirmed the location of ribosomal cistrons in the sm pair 8, and heteromorphism of these regions between the homologous chromosomes. C-banding revealed the occurrence of weak C-positive heterochromatin in the pericentromeric regions of several chromosomes, in addition to more evident bands interstitially...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Chromosomes; Chromomycin A3; 18S rDNA; NOR.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252010000300013

Cytogenetics of Gymnogeophagus setequedas (Cichlidae: Geophaginae), with comments on its geographical distribution
Provedor de dados: 83
Autores: Paiz,Leonardo M.; Baumgärtner,Lucas; Graça,Weferson J. da; Margarido,Vladimir P.; Pavanelli,Carla S.
ABSTRACT We provide cytogenetic data for the threatened species Gymnogeophagus setequedas, and the first record of that species collected in the Iguaçu River, within the Iguaçu National Park’s area of environmental preservation, which is an unexpected occurrence for that species. We verified a diploid number of 2n = 48 chromosomes (4sm + 24st + 20a) and the presence of heterochromatin in centromeric and pericentromeric regions, which are conserved characters in the Geophagini. The multiple nucleolar organizer regions observed in G. setequedas are considered to be apomorphic characters in the Geophagini, whereas the simple 5S rDNA cistrons located interstitially on the long arm of subtelocentric chromosomes represent a plesiomorphic character. Because G....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Chromosomes; Conservation; Iguaçu River; Karyotype; Paraná River.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252017000200211

Karyology of Mugil liza and M. curema from Venezuela
Provedor de dados: 20
Autores: Nirchio-T., M.; Cequea, H.
Karyotypes of Mugil liza and M. curema from Venezuela were studied. M. liza karyotype is 2n=48 acrocentric chromosomes, but M. curema is 2n=24, containing one submetacentric and 11 metacentric pairs. The chromosomic complement described for M. liza constitutes the first report for the speciesand coincides with the modal karyotype (2n=48) in the Mugilidae family. Venezuelan M. curema karyotype differs in number and shape from M. curema from Louisiana (USA), which has been reported to have a complement 2n=28 (10 metacentric pairs, two subtelocentric pairs and two acrocentric pairs).
Tipo: Journal Contribution
Palavras-chave: Karyotypes; Chromosomes; Karyotypes; Chromosomes; Http://aims.fao.org/aos/agrovoc/c_32486; Http://aims.fao.org/aos/agrovoc/c_1598.
Ano: 1998
URL: http://hdl.handle.net/1834/3290

Stability analysis of chickpea large genomic DNA inserts in Agrobacterium
Provedor de dados: 30
Autores: Rajesh, P.N.
Palavras-chave: Cloning; Genomes; Plasmids; DNA; Chickpeas; Genetic transformation; Chromosomes; Antibiotics; Bacteria; Genes.
Ano: 2007
URL: http://agropedia.iitk.ac.in/openaccess/?q=node/3293

THE ELEUSINES (A Review of the World Literature)
Provedor de dados: 30
Palavras-chave: Millets; Grain; Amino acids; Inorganic acid salts; Chromosomes; Nitrogen; Calcium; Sorghum; Pigments.
Ano: 2023
URL: http://agropedia.iitk.ac.in/openaccess/?q=node/3957

New molecular marker technologies for pearl millet improvement
Provedor de dados: 30
Autores: Gale, M.D.
Palavras-chave: Millets; Genomes; Genes; DNA; Genetic polymorphism; Genetic structures; Genetic markers; Locus; Genetic maps; Chromosomes.
Ano: 2005
URL: http://agropedia.iitk.ac.in/openaccess/?q=node/3219

Induction of Androgenesis as a Consequence of Wide Crossing in Chickpea
Provedor de dados: 30
Autores: Mallikarjuna, N.,( Nalini Mallikarjuna ).
Palavras-chave: Asexual reproduction; Chromosomes; Cytokinins; Hybrids; Chickpeas; Parthenogenesis; Cell culture; Organ culture; Interspecific hybridization; Organic compounds.
Ano: 2005
URL: http://agropedia.iitk.ac.in/openaccess/?q=node/3252

International Workshop on Groundnuts
Provedor de dados: 30
Autores: R.W.( Editor ).
Palavras-chave: Groundnuts; Root nodulation; Genotypes; Biological interaction; Mycotoxins; Chromosomes; Fungi; Breeds (animals); Polyploidy.
Ano: 1980
URL: http://agropedia.iitk.ac.in/openaccess/?q=node/3978

Use of 2n pollen in generating interspecific derivatives of groundnut
Provedor de dados: 30
Autores: Mallikarjuna, N.
Palavras-chave: Genomes; Polyploidy; Nucleus; Hybrids; Chromosome number; Chromosomes; Mosses; Meiosis; Cytogenetics; DNA.
Ano: 2006
URL: http://agropedia.iitk.ac.in/openaccess/?q=node/3176

Karyotype studies in Brazilian species of Lobelia L., subgenus Tupa (Campanulaceae)
Provedor de dados: 88
Autores: RUAS,PAULO M.; VANZELA,ANDRÉ L.L.; VIEIRA,ANA ODETE S.; BERNINI,CÉLIO; RUAS,CLAUDETE F.
Karyotypes of 14 populations including eight species of the genus Lobelia were studied using root tip mitotic metaphases. All populations were tetraploid with 2n = 28 chromosomes. The chromosome base number x = 7 was confirmed for the genus. Karyotype analysis showed that chromosome size varied from 1.05 µm to 2.02 µm with predominance of M and SM chromosome types. The karyotypes were similar among themselves with small intra- and interspecific variations on the size of haploid sets, symmetry indexes and centromere position of some chromosome pairs. These results showed that karyotypes of Brazilian lobelias of the subgenus Tupa were probably due to polyploidy associated with chromosomal rearrangements probably in small chromatin segments.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Lobelia; Campanulaceae; Chromosomes; Feulgen; Karyotype evolution.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84042001000300002

Karyotype characterization of Malpighia emarginata (Malpighiaceae)
Provedor de dados: 94
Autores: Mondin,Mateus; Oliveira,Carlos Alberto de; Vieira,Maria Lúcia Carneiro.
Malpighia emarginata Sessé &amp;amp; Mociño ex DC. or West Indian cherry (acerola) is a wild plant originated in southern Mexico, Central America and the northern region of South America. The species was introduced to Brazil about 60 years ago and now the country is the world's biggest producer. Even though the fruits of acerola have high commercial value, as they are an important source of the natural vitamin C, very little chromosome information is available for this species. Previous studies showed that most Malpighia species are diploids, including M. emarginata with 2n = 20. In the present paper, the chromosome number of acerola was confirmed, and for the first time, its karyotype was described, providing the identification of the homologues for the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Acerola; Cytology; Chromosomes; In vitro culture establishment; West Indian cherry.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-29452010000200005

Cytogenetics and DNA barcoding of the Round-eared bats, Tonatia (Chiroptera: Phyllostomidae): a new karyotype for Tonatia bidens
Provedor de dados: 103
Autores: Tavares,Jaqueline R.; Sousa,Tatiane P. de; Silva,Joaquim M. da; Venere,Paulo C.; Faria,Karina de C.
ABSTRACT There are two species of Neotropical Round-eared bats, Tonatia bidens Spix, 1823 and Tonatia saurophila Koopman &amp; Williams, 1951, which present highly similar morphological characteristics that can lead to errors of identification. Specimens originally identified as T. bidens have recently been reclassified as T. saurophila, and the only karyotype documented previously for these species was 2n = 16, FN = 20. In the present study, specimens of Tonatia collected in the municipality of Barra do Garças, in the Brazilian state of Mato Grosso, were analyzed morphologically, using conventional cytogenetic techniques (C-banding, Ag-NOR, and CMA3), and through sequences of the mitochondrial cytochrome c oxidase subunit I (COI) gene. In the specimens...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Chromosomes; COI gene; Karyotypes; Phyllostominae; Taxonomy.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702015000500371

A case of leucism in the burrowing owl Athene cunicularia (Aves: Strigiformes) with confirmation of species identity using cytogenetic analysis
Provedor de dados: 103
Autores: Nogueira,Denise M; Alves,Maria Alice S.
Leucism is an inherited disorder, characterized by the lack of pigments in part or all of the body, normal coloration of the eyes and, in birds, in naked parts such as the bill and legs. This kind of disorder is sometimes erroneously designated as albinism or partial albinism. In this study, we present a case of leucism in a wild owl. The studied individual presented completely white plumage, light-yellow coloration of legs and bill and normal coloration of eyes. According to morphological features, this owl is a specimen of burrowing owl, Athene cunicularia (Molina, 1782). To confirm the species identity, we used cytogenetic analyses for karyotypic determination, comparing it to the previously described one in the literature. We also studied a captive...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Aberrant plumage; Bird; Chromosomes; Karyotype.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702011000100008

Sexagesimal scale for mapping human genome
Provedor de dados: 97
Autores: CRUZ-COKE,RICARDO.
In a previous work I designed a diagram of the human genome based on a circular ideogram of the haploid set of chromosomes, using a low resolution scale of Megabase units. The purpose of this work is to draft a new scale to measure the physical map of the human genome at the highest resolution level. The entire length of the haploid genome of males is deployed in a circumference, marked with a sexagesimal scale with 360 degrees and 1296000 arc seconds. The radio of this circunference displays a semilogaritmic metric scale from 1 m up to the nanometer level. The base pair level of DNA sequences, 10-9 of this circunsference, is measured in milliarsec unit (mas), equivalent to a thousand of arcsecond. The "mas" unit, correspond to 1.27 nanometers (nm) or...
Tipo: Journal article
Palavras-chave: Human genome; DNA; Chromosomes; Genetic map.
Ano: 2001
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2001000000014

Cytogenetic study of pure breed and hybrid wild boar (Sus Scrofa Scrofa) in Southeast and South Brazil
Provedor de dados: 195
Autores: Lui, Jeffrey Frederico.
From December of 1977 to March of 1999, cytogenetic analyses were carried out with 1,137 boars from South and Southeast areas of Brazil. Three genetic groups of animal were cytogenetically identified: a) 2n=36 classified as pure wild boars, b) 2n=37, hybrid and c) 2n=38, called "Javaporco", ploidy which is equal to domestic pig. Being a subspecies as the domestic pig, the wild boars present facility in this breeding allowing the happening of different genetic groups in herd where the reproductive control is not appropriate.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cytogenetic; Wild boar; Chromosomes; Sus scrofa scrofa citogenética; Javali; Cromossomos; Sus scrofa scrofa.
Ano: 2000
URL: http://www.revistamvez-crmvsp.com.br/index.php/recmvz/article/view/3351

Karyotype of native Zea mays ssp. mays Proto-Confite morocho
Provedor de dados: 109
Autores: Lopéz Medina,Segundo Eloy; Mostacero Léon,José; Quijano Jara,Carlos Helí; Gil Rivero,Armando Efraín; Rabanal Che Leon,Maria Fernanda.
Abstract Corn is a crop of great importance in the world since it constitutes a basic component of the diet of the population; a production of 1026.61 million tons was estimated during the present year. Currently, there are many theories about the wild ancestors of corn, being Proto-Confite Morocho one of the primitive races in Peru, which is attributed as the ancestor of numerous native varieties. Therefore, knowledge of its genetic constitution is important since it gives us the possibility of finding phylogenetic affinities and indicators of systematic classification. The present study was carried out with the purpose of elaborating the karyotype of Zea mays ssp. mays ‘native corn’ Proto- Confite morocho and determine the number and morphology of the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Chromosomes; Chromosome number; Metaphase plate.
Ano: 2018
URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0120-28122018000400525

Evaluation of the mutagenic effect of the iodinated contrast medium Urografina® 292 using the micronucleus test in mouse bone marrow cells
Provedor de dados: 42
Autores: BELLE,MONICA B.B.; LEFFA,DANIELA D.; MAZZORANA,DALIANE; ANDRADE,VANESSA M. DE.
Contrast media (CM) are frequently used in diagnostic radiology and in radiotherapy as a diagnostic tool and in treatment planning. Previous studies have demonstrated that these compounds induce chromosomal aberrations. This study evaluates the mutagenic effects induced by the contrast medium Urografina® 292 (meglumine amidotrizoate and sodium-ionic dimmer) in bone marrow cells (BMC) of mice in vivo. Micronuclei assay was performed in BMC of CF-1 mice injected with CM 1.5 and 3.0 mL/kg intravenous doses and 1.0, 2.0, 3.0 mL/kg intraperitoneal doses. The animals were beheaded 24 h after treatment by cervical dislocation, and femur BMC from each animal were used in the micronucleus test. The group treated with the highest intravenous injection of Urografina®...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Chromosomes; Contrast medium; Micronuclei; Urografina® 292.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000200737

Karyological studies in Brazilian species of Lippia L. (Verbenaceae)
Provedor de dados: 42
Autores: Sousa,Saulo M.; Torres,Giovana A.; Viccini,Lyderson F.
The genus Lippia (Verbenaceae) comprise around 160 species spread out mainly in South and Central Americas with few African species, some of them with potential medicinal use. Brazil is one the most important centers of diversity with approximately 75% of the species described so far. Innumerous species are endemic and poorly studied especially at a cytological level. Here, chromosomal length, karyomorphology and chromosome asymmetry of twelve Brazilian species of Lippia were evaluated [L. alba (Miller) N.E.Brown, L. diamantinensis Glaz., L. florida Cham., L. hermanioides Cham., L. lacunosa Mart. &amp;amp; Schauer, L. lupulina Cham., L. pohliana Schauer, L. pseudothea (St. Hil) Schauer, L. rosella Moldenke, L. rotundifolia Cham., L. rubella Moldenke and L....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Chromosomes; Cytology; Dysploidy; Karyology; Lippia; Polyploidy.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652012000400017

Karyotype description of Pomacea patula catemacensis (Caenogastropoda, Ampullariidae), with an assessment of the taxonomic status of Pomacea patula
Provedor de dados: 47
Autores: Diupotex-Chong,María Esther; Cazzaniga,Néstor J.; Hernández-Santoyo,Alejandra; Betancourt-Rule,José Miguel.
Mitotic chromosomes of the freshwater snail Pomacea patula catemacensis (Baker 1922) were analyzed on gill tissue of specimens from the type locality (Lake Catemaco, Mexico). The diploid number of chromosomes is 2n = 26, including nine metacentric and four submetacentric pairs; therefore, the fundamental number is FN = 52. No sex chromosomes could be identified. The same chromosome number and morphology were already reported for P. flagellata, i.e., the other species of the genus living in Mexico. The basic haploid number for family Ampullariidae was reported to be n = 14 in the literature; so, its reduction to n = 13 is probably an apomorphy of the Mexican Pomacea snails. Lanistes bolteni, from Egypt, also shows n = 13, but its karyotype is much more...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Apple snails; Chromosomes; Taxonomy; Phylogeny; Mexico.
Ano: 2004
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0327-95452004000300004

KARYOLOGY OF MUGIL LIZA AND M. CUREMA FROM VENEZUELA
Provedor de dados: 50
Autores: Nirchio T.,Mauro; Cequea,Hernán.
Karyotypes of Mugil liza and M. curema from Venezuela were studied. M. liza karyotype is 2n=48 acrocentric chromosomes, but M. curema is 2n=24, containing one submetacentric and 11 metacentric pairs. The chromosomic complement described for M. liza constitutes the first report for the species and coincides with the modal karyotype (2n=48) in the Mugilidae family. Venezuelan M. curema karyotype differs in number and shape from M. curema from Louisiana (USA), which has been reported to have a complement 2n=28 (10 metacentric pairs, two subtelocentric pairs and two acrocentric pairs).
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Karyotype; Chromosomes.
Ano: 1998
URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0122-97611998000100004

Karyotypic studies and morphological analysis of some reproductive features in five species of Conyza (Astereae: Asteraceae) from Northeastern Argentina
Provedor de dados: 51
Autores: Urdampilleta,Juan D.; Amat,Aníbal G.; Bidau,Claudio J.
The cosmopolitan genus Conyza Less. comprises about 100 species, 22 of which occur in Argentina. Current taxonomic treatments, largely based on exomorphological characters, are insufficient to characterize and circumscribe some of their polymorphic species. Interspecific variations in inflorescences typology and capitula structure, as well as karyotypic aspects, were studied in five species of Conyza that naturally occur in Misiones Province (Argentina): C. blakei (Cabrera) Cabrera, C. bonariensis (L.) Cronquist var. bonariensis, C. glandulitecta Cabrera, C. primulaefolia (Lam.) Cuatrec. &amp;amp; Lourteig, C. sumatrensis (Retz.) E. Walker var. sumatrensis and C. sumatrensis (Retz.) E. Walker var. floribunda (Kunth) J. B. Marshall. Chromosome numbers for...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Asteraceae; Astereae; Chromosomes; Conyza; Inflorescence; Interspecific variation; Karyotype.
Ano: 2005
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1851-23722005000100010

Karyotypic studies in wild species of Arachis (Leguminosae) belonging to sections Erectoides, Procumbentes and Rhizomatosae
Provedor de dados: 51
Autores: Ortiz,Alejandra M; Silvestri,María C; Lavia,Graciela I.
Karyotypes of three diploid species belonging to sections Erectoides (Arachis hermannii), Procumbentes (A. rigonii) and Rhizomatosae (A. burkartii) were analyzed by Feulgen's technique. The karyotype formula was different in each of the taxa analyzed: 2n=2x=16m+4sm in A. hermannii, 2n=2x=18m+2sm in A. rigonii, and 2n=2x=20m in A. burkartii. All species had a pair of satellited chromosomes, which corresponded to type 2 in A. hermannii, type 9 in A. rigonii, and type 8 in A. burkartii. Arachis hermannii and A. rigonii presented chromosomal features similar to those of the other species included in their respective sections. However, A. burkartii showed chromosome characteristics different from those found in the rest of the species of section Rhizomatosae.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Arachis hermannii; A. rigonii; A. burkartii; Chromosomes; Phylogenetic relationships.
Ano: 2013
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1851-23722013000200010