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Search Results: 1 - 10 of 10756 matches for " Vel??squez Barrero Luz Stella "
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El medio ambiente urbano
??ngel Maya Augusto,Vel??squez Barrero Luz Stella
Gestión y Ambiente , 2009,
Abstract: En Colombia, los Grupos de Estudios Ambientales Urbanos -GEA -UR - que integran desde 1992 la Red Latinoamericana de Estudios Ambientales Urbanos, han planteado una nueva forma de interpretar la ciudad desde la perspectiva ambiental, a partir de estudios de caso que permitieron construir propuestas te 3ricas y metodol 3gicas para abordar la problem tica y el potencial ambiental de los asentamientos humanos. En este ensayo puesto a consideraci 3n de los GEA -UR se presenta una primera reflexi 3n sobre los principales aspectos conceptuales de la relaci 3n ciudad y medio ambiente. Los elementos aqu - planteados solo pretenden ser la base para un proceso din mico de investigaci 3n ambiental urbana, reconociendo los l -mites para abarcar los componentes de esa compleja estructura que es la ciudad moderna. De hecho, falta mucho todav -a para llegar a certezas cient -ficas o hip 3tesis consolidadas. Las ciencias ambientales apenas est n iniciando su formaci 3n y el peso de la tradici 3n en las formas de investigaci 3n, dificulta el avance hacia una concepci 3n interdisciplinaria de sistemas complejos, Keywords
Synonymy between Lymnaea bogotensis Pilsbry, 1935 and Lymnaea cousini Jousseaume, 1887 (Gastropoda: Lymnaeidae)
Velásquez, Luz Elena;
Memórias do Instituto Oswaldo Cruz , 2006, DOI: 10.1590/S0074-02762006000700015
Abstract: the lymneid snail lymnaea bogotensis pilsbry 1935 is synonymized with l. cousini jousseaume 1887, based on morphological comparisons of the reproductive systems. the shell, renal tube, and reproductive system are described and illustrated from specimens collected in the type locality and the municipality of paipa, colombia. bibliographical records reveal l. columella to be the commonest lymneid in the country. the latter two species can be differentiated based on the morphology of the penial complex.
Descripción de una especie de Cotylophoron (Digenea: Paramphistomidae) en bovinos del Meta y Guaviare, Colombia
Velásquez Trujillo Luz Elena
Acta Biológica Colombiana , 2012,
Abstract: RESUMEN La familia Paramphistomidae (Trematoda: Digenea) está compuesta por varias especies que parasitan el rúmen y causan un cuadro de enteritis severa con disminución en la producción láctea y cárnica de los rumiantes. La paramphistomosis bovina se ha registrado en los llanos orientales nacionales en cuatro oportunidades durante las dos últimas décadas, sin embargo en estos documentos no se ha divulgado la descripción de los parásitos para sustentar el estatus taxonómico específico asignado. El hallazgo de digeneos durante el 2006, 2007 y 2008 en el rúmen de bovinos sacrificados en el beneficiadero de Guamal, Meta, constituyó una oportunidad para describir y determinar la especie. Para ello se extrajeron 715 trematodos adultos del rúmen de 32 bovinos provenientes de los departamentos Meta y Guaviare. Los digeneos se procesaron individualmente y según las características morfológicas fueron determinados como Cotylophoron panamensis. El adulto reúne las siguientes características: de la familia Paramphistomidae, el canal de Laurer que atraviesa la vesícula excretora para abrirse paso debajo del poro excretor; del género Cotylophoron el acetábulo peque o y una ventosa genital; de C. panamensis la faringe tipo Calicophoron, acetábulo tipo Cotylophoron, ausencia de bulbo esofágico, ventosa genital tipo Cotylophoron sin esfínter, vitelarias laterales y dorsales que confluyen en su extremo posterior y los testículos usualmente yuxtapuestos. Con este estudio se ratifica la presencia de la paramfistomosis en el departamento del Meta y se registra por primera vez la presencia del trematodo en el departamento del Guaviare. Palabras clave: Bos indicus, Cotylophoron panamensis, Trematodo, Paramfistomosis. SUMMARY The family Paramphistomidae (Trematoda: Digenea) is compose by several species that parasitize the rumen and cause severe enteritis of clinical with a milk and meat decrease production of ruminants. The paramphistomosis cattle has been recorded in the eastern plains nationals four times over the past two decades. However in these documents has not disclosed the description of the parasites to support the specific taxonomic status assigned. The discovery of digenea in the rumen of cattle slaughtered in the slaughterhouse of Guamal, Meta, in 2006, 2007 and 2008 was an opportunity to describe and identify the species. This removed 715 adult flukes in the rumen of 32 cattle from Meta and Guaviare departments. The digenea
Análisis de la materia orgánica alóctona y organización funcional de macroinvertebrados en relación con el tipo de hábitat en ríos de monta?a de Patagonia
Velásquez,Stella M; Miserendino,M Laura;
Ecolog?-a austral , 2003,
Abstract: in this paper we examined the composition, structure and functional feeding groups of invertebrates in different habitats of four patagonian mountain rivers (blanco, baguilt, los rifleros and nant y fall). at each river, a representative sector was selected and sampled during high and low water periods. samples of macroinvertebrates, coarse particulate organic matter and fine particulate organic matter were obtained. seven habitat types were analyzed: boulder, cobble, pebble, and gravel (in riffle areas), and sand, leaf-packs, and macrophytes (in pools). at each habitat, three samples were collected per river and date. riffle areas had higher density and biomass of macroinvertebrates than pools. collector-gatherers were the dominant functional group followed by collector-filterers. shredders showed high density in boulder and gravel during the study. filterers were dominant in macrophytes and gravel, and their biomass was high in boulder, macrophytes, cobble and pebble. scrapers were common in boulder, pebble and cobble, but showed high biomass in gravel. both shredders and collector-gatherers co-dominated in leaf-packs. collector-gatherers were the only functional feeding group represented in sand. the coarse particulate organic matter in riffles was associated mainly with habitats of medium size substrates, while fine particulate organic matter was related to gravel and leaf-pack habitats. local geomorphology and related physical parameters influenced the distribution and biomass of organic matter. the results suggest that community structure and functional organization are distinctive at habitat scale in low order streams of patagonia, and they depend on the quality and availability of allochthonous organic resources.
LINKAGE MAPPING OF CANDIDATE GENES FOR INDUCE RESISTANCE AND GROWTH PROMOTION BY Trichoderma koningiopsis (Th003) IN TOMATO Solanum lycopersicum
SIMBAQUEBA,JAIME; COTES,ALBA MARINA; BARRERO,LUZ STELLA;
Acta Biológica Colombiana , 2011,
Abstract: induced systemic resistance (isr) is a mechanism by which plants enhance defenses against any stress condition. isr and growth promotion are enhanced when tomato (solanum lycopersicum) is inoculated with several strains of trichoderma ssp. this study aims to genetically map tomato candidate genes involved in isr and growth promotion induced by the colombian native isolate trichoderma koningiopsis th003. forty-nine candidate genes previously identified on tomato plants treated with th003 and t. hamatum t382 strains were evaluated for polymorphisms and 16 of them were integrated on the highly saturated genetic linkage map named “tomato expen 2000”. the location of six unigenes was similar to the location of resistance gene analogs (rgas), defense related ests and resistance qtls previously reported, suggesting new possible candidates for these quantitative trait loci (qtl) regions. the candidate gene-markers may be used for future isr or growth promotion assisted selection in tomato.
LARVAS DE DIGENEA EN Melanoides tuberculata (GASTROPODA: THIARIDAE) EN MEDELLíN, COLOMBIA
VERGARA,DANIELA; VELáSQUEZ,LUZ ELENA;
Acta Biológica Colombiana , 2009,
Abstract: the larvae of two trematodes found in the freshwater mollusk melanoides tuberculata (gastropoda: thiaridae) are described. 125 snails from the medellin’s botanical garden joaquín antonio uribe were collected. in the laboratory, each individual was placed alone and stimulated with light in order to have cercaria emission. 9.6% of the snails released cercariae. these were separated in three morphologies. from each one, 15 individuals were measured and drawn. photographs were taken. based on their morphological characteritics the presence of centrocestus formosanus (heterophyidae) was determined. the other two morphologies were classified in the family philophthalmidae. one of them constitutes the first register for colombia. the sensibility of m. tuberculata to infections by digeneans, and the specificity of the family philophthalmidae to mollusk hosts of the superfamily cerithioidea are confirmed
LARVAS DE DIGENEA EN Melanoides tuberculata (GASTROPODA: THIARIDAE) EN MEDELLíN, COLOMBIA
VERGARA DANIELA,VELáSQUEZ LUZ ELENA
Acta Biológica Colombiana , 2009,
Abstract: RESUMEN Se describen las larvas de digeneos que se obtuvieron en Melanoides tuberculata (Gastropoda: Thiaridae), molusco dulceacuícola del que se colectaron 125 especímenes en el lago del Jardín Botánico Joaquín Antonio Uribe de Medellín. En el laboratorio se individualizaron y se estimuló la emisión cercariana con una fuente luminosa. El 9,6 % de los caracoles emitió cercarias. Los moluscos emisores se sacrificaron para obtener los demás estadios larvarios. Las larvas se montaron al microscopio, se midieron y luego se dibujaron. Los caracteres morfológicos permitieron establecer la presencia de Centrocestus formosanus (Heterophyidae) y de dos Philophthalmidae. Uno de estos es primer registro para Colombia. Se confirma la sensibilidad de M. tuberculata a infecciones por digeneos, así como la especificidad de los filoftálmidos por moluscos hospedadores de la superfamilia Cerithioidea. Palabras claves: cercarias, digenea, Melanoides tuberculata, Philophthalmidae, Redias. ABSTRACT The larvae of two trematodes found in the freshwater mollusk Melanoides tuberculata (Gastropoda: Thiaridae) are described. 125 snails from the Medellina€ s Botanical Garden Joaquín Antonio Uribe were collected. In the laboratory, each individual was placed alone and stimulated with light in order to have cercaria emission. 9.6% of the snails released cercariae. These were separated in three morphologies. From each one, 15 individuals were measured and drawn. Photographs were taken. Based on their morphological characteritics the presence of Centrocestus formosanus (Heterophyidae) was determined. The other two morphologies were classified in the family Philophthalmidae. One of them constitutes the first register for Colombia. The sensibility of M. tuberculata to infections by digeneans, and the specificity of the family Philophthalmidae to mollusk hosts of the superfamily Cerithioidea are confirmed. Key words: Cercariae, Digenea, Melanoides tuberculata, Philophthalmidae, Rediae.
Ganglios normales del mediastino: un estudio anatómico
Velásquez,Mauricio; Ojeda,Paulina; Martínez,Stella Isabel;
Revista Colombiana de Cirugía , 2009,
Abstract: lung cancer is the number one cause of cancer worldwide, and surgery remains the only curative option. systematic lymph node dissection as part of the surgical treatment of lung cancer remains a controversial issue, and there is still no clarity as to the number of nodes that should excised for an adequate mediastinal lymph node dissection. an anatomical dissection study in cadavers free of lung cancer was performed in order to establish mean valid number and size of the mediastinal lymph nodes. twenty cadavers were dissected, encountering 260 node stations, 13 stations per cadaver. in total, 1,037 nodes were dissected, with a mean of 4 nodes per station and 52 nodes per cadaver, with a minimum of 39 nodes and a maximum of 118 nodes per cadaver. comparing the two sides of the mediastinum, 592 nodes were dissected in the right side, with an average of 30 nodes per cadaver, and 621 in the left side, with an average of 31nodes per cadaver. when comparing our findings pertinent to the size of the nodes with those of other studies, the minimal size of the nodes found in our study appears similar to those of the other studies, but the maximal size is larger; our explanation is the greater incidence of inflammatory diseases and of nodes with anthracosis prevailing in our country, both of which may increase the size of the mediastinal nodes.
Ganglios normales del mediastino: un estudio anatómico Normal mediastinal lymph nodes: an anatomical study
Mauricio Velásquez,Paulina Ojeda,Stella Isabel Martínez
Revista Colombiana de Cirugía , 2009,
Abstract: El cáncer pulmonar es la primera causa de mortalidad por cáncer a nivel mundial, y la cirugía ha demostrado ser la única opción curativa para esta enfermedad. El vaciamiento ganglionar del mediastino en el cáncer pulmonar es un tema discutido y no está claro cuántos ganglios se deben extraer de allí para considerar que se ha hecho un adecuado vaciamiento ganglionar. Se hizo un estudio de disección en cadáveres de pacientes sin cáncer pulmonar para establecer unos valores promedio del número y el tama o de los ganglios del mediastino. Se disecó el mediastino de 20 cadáveres. Se disecaron 260 estaciones ganglionares, 13 estaciones por cadáver. En total se disecaron 1.037 ganglios, con un promedio de 4 ganglios por estación y de 52 ganglios por cadáver, para un mínimo de 39 y un máximo de 118 ganglios por cadáver. Si se separa el número de ganglios según los hallados en cada lado, en el lado derecho se disecaron 592 ganglios con un promedio de 30 ganglios por cadáver y, en el lado izquierdo, 621 ganglios con un promedio de 31 ganglios por cadáver. Al comparar los tama os encontrados en los diferentes estudios, se debe resaltar que, en general, en nuestro estudio los diámetros mínimos son similares; sin embargo, los diámetros máximos de los ganglios son mayores, lo que se explica por la mayor incidencia de enfermedades inflamatorias y la mayor presencia de ganglios con antracosis en nuestro medio, que pueden provocar un aumento en el tama o de los ganglios del mediastino. Lung cancer is the number one cause of cancer worldwide, and surgery remains the only curative option. Systematic lymph node dissection as part of the surgical treatment of lung cancer remains a controversial issue, and there is still no clarity as to the number of nodes that should excised for an adequate mediastinal lymph node dissection. An anatomical dissection study in cadavers free of lung cancer was performed in order to establish mean valid number and size of the mediastinal lymph nodes. Twenty cadavers were dissected, encountering 260 node stations, 13 stations per cadaver. In total, 1,037 nodes were dissected, with a mean of 4 nodes per station and 52 nodes per cadaver, with a minimum of 39 nodes and a maximum of 118 nodes per cadaver. Comparing the two sides of the mediastinum, 592 nodes were dissected in the right side, with an average of 30 nodes per cadaver, and 621 in the left side, with an average of 31nodes per cadaver. When comparing our findings pertinent to the size of the nodes with those of other studies, the minimal size of the nodes found in our study appears simila
Genetic variation in the Solanaceae fruit bearing species lulo and tree tomato revealed by Conserved Ortholog (COSII) markers
Enciso-Rodríguez, Felix;Martínez, Rodrigo;Lobo, Mario;Barrero, Luz Stella;
Genetics and Molecular Biology , 2010, DOI: 10.1590/S1415-47572010005000016
Abstract: the lulo or naranjilla (solanum quitoense lam.) and the tree tomato or tamarillo (solanum betaceum cav. sendt.) are both andean tropical fruit species with high nutritional value and the potential for becoming premium products in local and export markets. herein, we present a report on the genetic characterization of 62 accessions of lulos (n = 32) and tree tomatoes (n = 30) through the use of pcr-based markers developed from single-copy conserved orthologous genes (cosii) in other solanaceae (asterid) species. we successfully pcr amplified a set of these markers for lulos (34 out of 46 initially tested) and tree tomatoes (26 out of 41) for molecular studies. six polymorphic cosii markers were found in lulo with a total of 47 alleles and five polymorphic markers in tree tomato with a total of 39 alleles in the two populations. further genetic analyses indicated a high population structure (with fst > 0.90), which may be a result of low migration between populations, adaptation to various niches and the number of markers evaluated. we propose cosii markers as sound tools for molecular studies, conservation and the breeding of these two fruit species.
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