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Search Results: 1 - 10 of 586022 matches for " Antonieta A.; Páramo-Delgadillo "
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Caracterización cariotípica en mitosis y meiosis del robalo blanco Centropomus undecimalis (Pisces: Centropomidae)
Arias-Rodriguez,Lenin; Indy,Jeane R.; Ahumada-Hernández,Rosa I.; Barragán-Cupido,Helen; ávalos-Lázaro,Antonieta A.; Páramo-Delgadillo,Salomón;
Revista de Biología Tropical , 2011,
Abstract: karyotypic characterization in mitosis and meiosis of the common snook centropomus undecimalis (pisces: centropomidae). the common snook centropomus undecimalis inhabits marine, brackish and freshwater habitats in the western central atlantic ocean, including the gulf of mexico. common snook is an economically important fish in many localities, nevertheless the number of studies on its biology and genetics are still few. the present study attempts to establish the cytogenetic profiles of the specimens collected in paraiso municipality tabasco, mexico. tissue of five females and eight male organisms were processed by conventional cytological techniques to obtain chromosome slides of high quality in order to assemble the karyotype. the results from the kidney tissue analysis showed that 85.1% of 288 mitosis had a 2n=48 chromosomes, and 52.8% of 104 meiosis exhibited the haploid number 1n=24. the diploid karyotype showed 48 monoarmed chromosomes of the telocentric (t) type. there was no chromosome heteromorphism between females and males. the diploid karyotype was very similar to that observed in the majority of marine fishes. rev. biol. trop. 59 (2): 683-692. epub 2011 june 01.
Cariotipo del pejelagarto tropical Atractosteus tropicus (Lepisosteiformes: Lepisosteidae) y variación cromosómica en sus larvas y adultos
Arias-Rodríguez,Lenin; Páramo-Delgadillo,Salomón; Contreras-Sánchez,Wilfrido M; álvarez-González,Carlos A;
Revista de Biología Tropical , 2009,
Abstract: karyotype of the tropical gar atractosteus tropicus lepisosteiformes: lepisosteidae) and chromosomal variation in their larval and adults. the karyotype of the tropical gar atractosteus tropicus is described from conventional giemsa-staining of 295 mitotic chromosome slides from 120 larvae and 15 adults (five females and ten males) from tabasco, southern of mexico. the diploid number 2n = 56 chromosomes was calculated (73 spreads from 206 larval and 208 adult metaphases). variation on chromosome number was from 46 (4.4%) to 64 (3.9%) chromosome elements on larval samples, whereas 58 (11.7 %) chromosomes were the second most abundant after the diploid number of 2n = 56 (35%). such variation was related with the presence of mobile microchromosomes. the karyotype was determined from six clear chromosome spreads photographed from three females and three males. the averaged karyotype was integrated by eight pairs of metacentric (m) chromosomes, four submetacentric (sm) pairs, eight telocentric (t) pairs and eight pairs of telocentric micro-chromosomes (*t). the fundamental number was fn = 80 chromosome arms. we saw no sexual differences on chromosome structure. rev. biol. trop. 57 (3): 529-539. epub 2009 september 30.
Cariotipo del pejelagarto tropical Atractosteus tropicus (Lepisosteiformes: Lepisosteidae) y variación cromosómica en sus larvas y adultos
Lenin Arias-Rodríguez,Salomón Páramo-Delgadillo,Wilfrido M Contreras-Sánchez,Carlos A álvarez-González
Revista de Biología Tropical , 2009,
Abstract: El cariotipo del pejelagarto Atractosteus tropicus se describe por medio de tinción Giemsa de 295 preparaciones cromosómicas en mitosis a partir de 120 larvas y 15 adultos (5 hembras y diez machos) de la población que habita en Tabasco, sureste de México. El número diploide 2n=56 cromosomas se dio en 281 dispersiones cromosómicas de un total de 445 muestras, de ellas 73 dispersiones provinieron de 206 metafases larvales, y 208 dispersiones de 239 metafases de adultos. Se observó variación en el número de cromosomas desde 46 hasta 64 elementos cromosómicos (larvas). Las metafases con 58 cromosomas fueron el segundo valor más abundante, después del número diploide 2n=56 (35%). En los adultos esa variación no fue relevante. Esta variación cromosómica se relaciona con microcromosomas móviles. El cariotipo se determinó de seis dispersiones cromosómicas bien definidas de tres hembras y tres machos; y el cariotipo promedio se integró de ocho pares de cromosomas metacéntricos (m), cuatro pares de cromosomas submetacéntricos (sm), ocho pares de telocéntricos (t), y ocho pares de microcromosomas telocéntricos (*t) El número fundamental observado en el cariotipo típico promedio fue NF = 80 brazos cromosómicos. No se detectaron diferencias sexuales. Karyotype of the tropical gar Atractosteus tropicus Lepisosteiformes: Lepisosteidae) and chromosomal variation in their larval and adults. The karyotype of the tropical gar Atractosteus tropicus is described from conventional Giemsa-staining of 295 mitotic chromosome slides from 120 larvae and 15 adults (five females and ten males) from Tabasco, southern of Mexico. The diploid number 2n = 56 chromosomes was calculated (73 spreads from 206 larval and 208 adult metaphases). Variation on chromosome number was from 46 (4.4%) to 64 (3.9%) chromosome elements on larval samples, whereas 58 (11.7 %) chromosomes were the second most abundant after the diploid number of 2n = 56 (35%). Such variation was related with the presence of mobile microchromosomes. The karyotype was determined from six clear chromosome spreads photographed from three females and three males. The averaged karyotype was integrated by eight pairs of metacentric (m) chromosomes, four submetacentric (sm) pairs, eight telocentric (t) pairs and eight pairs of telocentric micro-chromosomes (*t). The fundamental number was FN = 80 chromosome arms. We saw no sexual differences on chromosome structure. Rev. Biol. Trop. 57 (3): 529-539. Epub 2009 September 30.
Mitotic karyotype of the tropical freshwater crayfish Procambarus (Austrocambarus) llamasi (Decapoda: Cambaridae)
Indy,Jeane R; Arias-Rodriguez,Lenin; Páramo-Delgadillo,Salomón; Hernández- Vidal,Ulises; álvarez-González,Carlos A; Contreras-Sánchez,Wilfrido M;
Revista de Biología Tropical , 2010,
Abstract: in mexico, the biology of procambarus has been more studied than the biology of other cambarids because of its diversity and potential use in aquaculture. we determined the karyotype of the mexican tropical freshwater crayfish procambarus (austrocambarus) llamasi from 189 metaphase spreads from gill tissues of 17 adults. they had 98-120 chromosomes (mode 2n=120 chromosomes). there are 60 pairs of monoarm, telocentric chromosomes. sex chromosomes were not detected and we propose that the p. llamasi karyotype can be used to distinguish this species from other mexican crayfish. additionally, we suggest using karyological data in aquaculture and conservation biology. rev. biol. trop. 58 (2): 655-662. epub 2010 june 02.
Los cromosomas mitóticos y meióticos del pez tropical Petenia splendida (Cichlidae)
Arias-Rodriguez,Lenin; Ibarra-Castro,Leonardo; Páramo-Delgadillo,Salomón;
Revista de Biología Tropical , 2008,
Abstract: the mitotic and meiotic chromosomes of the tropical fish petenia splendida (cichlidae). the karyotype of bay snook, petenia splendida, is described based on mitotic and meiotic stages of sixty larvae and twelve juveniles from tabasco, mexico. standard cytological procedures with minor modifications were followed to obtain mitotic and meiotic chromosome spreads. one hundred chromosome slides were analyzed and 290 chromosome spreads were counted. high-quality spreads in mitosis and meiosis were used for karyotype analysis. mitotic chromosome spreads showed 76.7 % of such cells with 2n=48 chromosomes, while meiotic spreads revealed 55.2 % with 24 chromosomes in haploid stage. photographic documentation of eight highquality pictures showed that the karyotype consists of three pairs of bi-armed metacentric-submetacentric chromosomes (msm) and 21 pairs with uni-armed subtelocentric-acrocentric chromosomes (sta), with a fundamental number (fn) of 54 arms. karyotype chromosomes were verified by analysis of haploid and diploid metaphases at meiotic stage i. abundant chromosome spreads were observed more frequently on slides from larvae. no evidence of heteromorphism to discriminate sexual chromosomes was detected. there were "dot-like" chromatic bodies in both sexes and they were classified as "b" chromosomes. the karyotype of p. splendida is type "a", i.e. primitive in the cichlid family, similar to other species of cichlasoma. the occurrence of supernumerary chromosomes is still unknown: studies on the effects of pollution and hybridization might be important to understand that phenomenon. rev. biol. trop. 56 (2): 895-907. epub 2008 june 30.
Caraterización citogenética del pez tropical de agua dulce Parachromis managuensis (Pisces:Cichlidae)
Arias-Rodriguez,Lenin; Páramo-Delgadillo,Salomón; Durán-González,Alicia de la Luz;
Revista de Biología Tropical , 2006,
Abstract: citogenetic characterization of the tropical freshwater fish parachromis managuensis (pisces: cichlidae). to describe the cytogenetics of the jaguar cichlid fish parachromis managuensis, we collected eight males and 13 females in villahermosa, tabasco, méxico. the specimens were processed with standard cytogenetic techniques (slightly modified), and high quality fields of chromosomes in mitosis and meiosis were obtained; 14 of these fields were analyzed by meristics and statistics methods. the specimens presented a diploid modal number of 2n=48 chromosomes, which is similar to the number reported for others central american cichlids; five pairs were submetacentric-metacentrics(biarmed)and 19 were subtelocentric-telocentric (uni-armed),giving a fundamental number (nf)of 58.the haploid number was confirmed by counting meiotic fields in metaphase i. there was not evidence of heteromorphism: sexual chromosomes were not identifiable. rev. biol. trop. 54 (1): 35-42. epub 2006 mar 31.
Caraterización citogenética del pez tropical de agua dulce Parachromis managuensis (Pisces:Cichlidae)
Lenin Arias-Rodriguez,Salomón Páramo-Delgadillo,Alicia de la Luz Durán-González
Revista de Biología Tropical , 2006,
Abstract: Para contribuir con el ordenamiento de las especies de la familia Cichlidae, se realizó el estudio citogenético de la mojarra pinta Parachromis managuensis. Fueron utilizados veintiún organismos, ocho machos y trece hembras,colectados en Villahermosa, Tabasco, México. Los especímenes se procesaron por técnicas citogenéticas convencionales (con ligeras modificaciones). Se obtuvieron campos mitóticos y meióticos de buena calidad, de los que fueron seleccionados catorce cariotipos para ser analizados merística y estadísticamente. Los especímenes presentaron número modal diploide de 2n=48 cromosomas, similar al reportado para otros cíclidos neotropicales. Cinco pares fueron cromosomas metacéntricos-submetacéntricos (birrámeos) y 19 pares cromosomas subtelocéntricos-telocéntricos (monorrámeos),con número fundamental (NF) de 58 brazos.El número haploide se ratificó por conteo de campos meióticos en metafase I. Los campos mitóticos observados y los cariotipos de machos y hembras no presentaron evidencias heteromórficas para identificar cromosomas sexuales. Citogenetic characterization of the tropical freshwater fish Parachromis managuensis (Pisces: Cichlidae). To describe the cytogenetics of the jaguar cichlid fish Parachromis managuensis, we collected eight males and 13 females in Villahermosa, Tabasco, México. The specimens were processed with standard cytogenetic techniques (slightly modified), and high quality fields of chromosomes in mitosis and meiosis were obtained; 14 of these fields were analyzed by meristics and statistics methods. The specimens presented a diploid modal number of 2n=48 chromosomes, which is similar to the number reported for others Central American cichlids; five pairs were submetacentric-metacentrics(biarmed)and 19 were subtelocentric-telocentric (uni-armed),giving a fundamental number (NF)of 58.The haploid number was confirmed by counting meiotic fields in metaphase I. There was not evidence of heteromorphism: sexual chromosomes were not identifiable. Rev. Biol. Trop. 54 (1): 35-42. Epub 2006 Mar 31.
Mitotic karyotype of the tropical freshwater crayfish Procambarus (Austrocambarus) llamasi (Decapoda: Cambaridae)
Jeane R Indy,Lenin Arias-Rodriguez,Salomón Páramo-Delgadillo,Ulises Hernández- Vidal
Revista de Biología Tropical , 2010,
Abstract: In Mexico, the biology of Procambarus has been more studied than the biology of other Cambarids because of its diversity and potential use in aquaculture. We determined the karyotype of the Mexican tropical freshwater crayfish Procambarus (Austrocambarus) llamasi from 189 metaphase spreads from gill tissues of 17 adults. They had 98-120 chromosomes (mode 2n=120 chromosomes). There are 60 pairs of monoarm, telocentric chromosomes. Sex chromosomes were not detected and we propose that the P. llamasi karyotype can be used to distinguish this species from other Mexican crayfish. Additionally, we suggest using karyological data in aquaculture and conservation biology. Rev. Biol. Trop. 58 (2): 655-662. Epub 2010 June 02. El género Procambarus ha recibido mayor atención en los estudios de los principios fundamentales de su biología debido a su diversidad en el territorio mexicano y potencial uso en acuicultura. El cariotipo típico del acocil tropical mexicano Procambarus (Austrocambarus) llamasi, se estudió mediante 189 dispersiones cromosómicas en metafase del tejido branquial de 17 adultos tratados con la técnica citológica de inmersión. Encontramos un amplio número de cromosomas, que variaron entre 98-120 elementos cromosómicos, con número modal diploide de 2n=120 elementos cromosómicos. El cariotipo del acocil tropical esta constituido por 60 pares de cromosomas monorrámeos, todos los centrómero están en la región telocéntrica de los cromosomas. En las metafases mitóticas de hembras y machos no fueron identificados cromosomas sexuales. Sugerimos considerar la estructura cromosómica del cariotipo como una herramienta citotaxonómica así como el empleo de datos cariológicos para propósitos de acuicultura y conservación del acocil tropical.
SIGNIFICADOS DE ADOLESCENCIA Y PSICOTERAPIA: ANáLISIS LEXICOMéTRICO DE DISCURSOS GRUPALES
PáRAMO,MARíA DE LOS áNGELES;
Acta Colombiana de Psicología , 2010,
Abstract: the main objectives of this study were: a) to analyze the meanings of adolescence, psychotherapy and related themes, trough focal groups with argentinean adolescents (15-20 years old, both genders), and their close relations (parents, teachers, and psychotherapists); b) to carry out a lexicometrical analysis of discursive textual data obtained from the discussion groups. the methodology was of quantitative nature, based on the lexicometrical analysis. the sample was intentional, no probabilistic. results were discussed on the basis of the general topic of adolescence, psychotherapy and related aspects (estimations and opinions about adolescence, family and peer relationships; educational, health and social systems; dif?culties or problems, protective factors and coping strategies.
NI?AS Y NI?OS COLOMBIANOS EN LOS ESTADOS UNIDOS. AGENCIA, IDENTIDADES Y CAMBIOS CULTURALES ALREDEDOR DE LA COMIDA
DUQUE PáRAMO,MARíA CLAUDIA;
Revista Colombiana de Antropología , 2008,
Abstract: based on a participatory ethnographic study, conducted between 2003 and 2004 in tampa, florida, with colombian boys and girls ages 7 to 12 years old, this article explores the relationship among migration, childhood, agency, food and culture. the main idea is that children are agents and actors building identities that are expressed in their food practices and preferences. like in a creolization phenomenon, immigrants mix cultural elements from their original region in colombia with those encountered in the us context, producing new and different cultural meanings and symbols. i highlight the importance of developing anthropological studies that enable us to recognize the subtleties of the experiences of the immigrants, as well as recognize and value children as agents building cultures and identities
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