Mostrando recursos 1 - 20 de 271

  1. La Patagonia Chilena: Un nuevo El Dorado para el Turismo Científico

    Bourlon, Fabien; Mao, Pascal
    La presente obre explora las variadas formas de asociar el turismo y la ciencia en un confín geográfico, como lo es la Patagonia chilena. Si bien este espacio esta cargado de valor simbólico en los imaginarios de los viajeros, el desarrollo del turismo es aun allí incipiente debido al intricado territorio, las complejidades en cuanto a circulación y a una oferta aun poco estructurada. Este espacio cuenta con un sin número de recursos naturales y culturales. Durante su larga historia de descubrimiento europeo, abierto por Hernán de Magallanes en 1520, la Patagonia recibe la visita de un gran número de...

  2. Proyecto de capacitación destinado a los jóvenes de La Luciérnaga (RENOVACIÓN).

    Ascar, Graciela Inés
    Los jóvenes que trabajan en la calle viven una constante vulneración de sus derechos, no pudiendo acceder a los sistemas de educación, ni a un trabajo formal que les brinde una mejor calidad de vida. Por esto, la Facultad de Ciencias Químicas, conjuntamente con la Facultad de Ciencias Económicas y de la Administración, pone a disposición a sus directivos, docentes, no docentes y estudiantes, comprometidos con la realidad, para brindar capacitaciones a jóvenes pertenecientes a la Fundación La Luciérnaga con el fin de posibilitarles herramientas para una futura insersión laboral. Las temáticas de las capacitaciones se relacionan con la Manipulación...

  3. Efecto de la infección con el virus de la rabia sobre la expresión de marcadores neuronales y la ultraestructura de motoneuronas en médula espinal de ratones

    Monroy Gomez, Jeison Alexander
    La mayoría de estudios de los efectos del virus de la rabia en el sistema nervioso se han enfocado en el encéfalo. Pero, es la médula espinal, el componente del sistema nervioso central por donde generalmente ingresa el virus desde los nervios periféricos. El propósito de esta investigación fue estudiar el tejido infectado con el virus de la rabia, en la médula espinal de ratones, mediante el análisis de la distribución de los antígenos virales, la inmunorreactividad de marcadores neuronales y la ultraestructura de las células infectadas. Se inocularon ratones con virus de la rabia por vía intramuscular en las...

  4. Ciencias, técnicas y humanidades: convivencialidad y democracia del saber

    Sanchez Albarracin, Enrique
    En nuestro mundo de inmediatez y de ubicuidad no deja de aumentar nuestra ignorancia conforme van multiplicándose y acelerándose los procesos de producción de datos, informaciones y conocimientos. La incertidumbre y la complejidad parecen haber nublado el horizonte de tal suerte que ya no existen racionalidades indiscutibles y transmisibles, capaces de abarcarlo todo, de reducir la diversidad natural y social al ámbito seguro e inteligible del laboratorio, de predecir siquiera a mediano plazo la evolución de los fenómenos y los contextos que atañen apenas a nuestra propia generación. En estas condiciones cabe preguntarse si la labor educativa, para enfrentar los...

  5. Efecto de la aplicación de enmiendas orgánicas y azufre elemental sobre propiedades químicas, físicas y biológicas de un suelo sódico typic haplustepts con cultivo de maíz (Zea mayz) en El Copey-Cesar

    Simanca Fontalvo, Richar Manuel
    Se determinó el efecto de la aplicación de un abono verde, vermicompost y azufre mineral sobre las propiedades fisicoquimicas y biológicas de un suelo sódico Tipyc Haplustepts bajo cultivo de Z. mays. Se estableció un ensayo en campo de 9 tratamientos con tres repeticiones, agrupados en un diseño de bloques completos al azar, para un total de 27 parcelas de 10m2 que consistían de aplicaciones únicas o mezcladas de materia orgánica de Prosopis juliflora o vermicompost y azufre elemental, correspondiente al 100% de la cantidad requerida de azufre elemental para disminuir el porcentaje de saturación de sodio intercambiable (PSI) hasta...

  6. La aparente impenetrabilidad de la autonomía universitaria

    Junca Rodríguez, César Mauricio
    El objetivo de este documento es explorar la perspectiva de la autonomía universitaria a la luz de los fines y particularidad de la universidad. La autonomía universitaria es un asunto que, desde variadas perspectivas, es determinante en la manera en que se comprende, realiza y proyecta el quehacer educativo. Está determinada por el contexto socio-cultural y político en que se pretende llevar a cabo; actualmente, las condiciones impuestas por el modelo económico capitalista hacen que su relación con la libertad sea paradójica: centrada en la limitación y negación, la libertad de unos está vinculada con la no-libertad de otros. La...

  7. MASSIVE QUANTITIES OF PELAGIC Sargassum ON THE SHORES OF SAN ANDRES ISLAND, SOUTHWESTERN CARIBBEAN

    GAVIO, Brigitte; RINCÓN-DÍAZ, M. Natalia; SANTOS-MARTÍNEZ, Adriana
    We report an unusual biomass of floating Sargassum, composed of the species S. fluitans and S. natans, that reached the northeastern coast of San Andres island in September 2014. The time and size of the event is unprecedented to the island.Cantidades masivas de Sargassum pelágicos en las costas de San Andrés Isla, Caribe suroccidentalSe reporta la llegada de una biomasa inusual de Sargassum flotante, compuesta por las especies S. fluitans y S. natans, a la costa nororiental de la isla de San Andrés. La época y el tamaño del evento nunca habían sido reportados anteriormente para la isla.

  8. New Records of Phlebotomine Sandflies (Diptera: Psychodidae) at Sierra Nevada de Santa Marta, Colombia

    BEJARANO, Eduar Elías; URIBE, Sandra; PÉREZ-DORIA, Alveiro; EGURROLA, Jorge; DIB, Juan Carlos; POTER, Charles
    NUEVOS HALLAZGOS DE FLEBOTOMÍNEOS (DIPTERA: PSYCHODIDAE) EN LA SIERRA NEVADA DE SANTA MARTA, COLOMBIAEl componente entomológico de la leishmaniasis ha sido poco estudiado en la Sierra Nevada de Santa Marta, Colombia, incluido el departamento del Magdalena, donde a la fecha están registradas trece especies de Lutzomyia. En la presente nota se informa el hallazgo de tres especies y un subgénero más en la región. Se recolectaron 885 flebotomíneos en Seywiaka y las veredas Las Tinajas y Calabazo, estribaciones de la Sierra Nevada de Santa Marta (117-130 m.s.n.m.). El 84% de los ejemplares se obtuvieron con trampa CDC, el 11% con...

  9. THERMAL TIME FOR REPRODUCTIVE PHENOLOGICAL STAGES OF PINEAPPLE GUAVA (Acca sellowiana (O. Berg) Burret)

    PARRA-CORONADO, Alfonso; FISCHER, Gerhard; CHAVES-CORDOBA, Bernardo
    Crop development of feijoa (Acca sellowiana (O. Berg) Burret) is mainly stimulated by temperature, but is also affected by other climatic factors. The determination of the development in terms of thermal time or growing degree days (GDD) is more precise than calendar days. The aim of this study was to propose a phenological model for feijoa cv. Quimba, in which the base temperature (Tb) for four different phenological stages and its duration in terms of GDD is estimated to predict the timing of anthesis, fruit setting and harvesting. During the years 2012 to 2014, in two localities of the department...

  10. Oviposition behavior and microstructure of the eggs of Simulium dinellii (Joan) (Diptera: Simuliidae)

    MANTILLA, Juan S.; MONCADA, Ligia I.; MATTA, Nubia E.; ADLER, Peter H.
    Little is known of the oviposition habits and egg structure of Neotropical members of the Simuliidae family. The oviposition behavior of Simulium dinellii (Joan) was observed near at Otún Quimbaya, Colombia. Small groups of females hovered about 2 cm above the water surface to oviposit. Some of these females has been capture and the eggs were obtained, This eggs were count, measured and processed by scan electro microscopic.  Subtriangular eggs had a latticework of polygons on the endochorionic surface. Chorionic differences between the eggs of S. dinellii and the few previously studied species suggest potential taxonomic value of eggs microstructure.COMPORTAMIENTO DE OVIPOSICIÓN...

  11. Testicular Morphohistology of Hypsiboas pulchellus (Amphibia, Hylidae) During the Breeding Season

    CAREZZANO, Fernando José; DORFLINGER, Karina; ALONSO, Matías; URQUIZA BARDONE, Sergio Pablo
    In this study, data concerning to the morphological testicular features of Hypsiboas pulchel-lus during the breeding season is provided, in order to know aspects of their reproductive biology. The testis, ovoid and yellowish with 4.64 ± 0.48 mm length and 2.05 ± 0.23 mm wide, are surrounded by the tunica albuginea which measures 5.60 ± 0.82 µm. The seminif-erous locules, placed internally, measure 257.47 ± 58.25 µm in diameter, and cysts with spermatogenic cells associated with Sertoli cells are distinguished in them. The interstitial tissue is scarce. The biggest cells of the germinal series are the spermatogonia I (14.34 ±...

  12. EFFECT OF FOLIAR APPLICATION OF AMINOACIDS ON PLANT YIELD AND PHYSIOLOGICAL PARAMETERS IN FABA BEAN PLANTS IRRIGATED WITH SEAWATER

    ABDELHAMID, Magdi T.; SH SADAK, Mervat; SCHMIDHALTER, Urs
    Salinity decreases yield in arid and semi-arid areas. With increasing demand for irrigation water, alternative sources are being sought. Seawater salinity was previously considered unusable for irrigation. However, this water can be used successfully to grow crops under certain conditions. Amino acids is well known biostimulant which has positive effects on plant growth and yield, and significantly mitigates the injuries caused by abiotic stresses Therefore, in the present study, the effect of exogenously treatment amino acid on faba bean plant growing under sea water salt stress was investigated. Reduction of salinity damage in faba bean by using a mixture of...

  13. Distribution of Centruroides edwardsii CENTRUROIDES EDWARDSII (GERVAIS, 1843) in the Aantioquia Province, Colombia

    ESTRADA GÓMEZ, SEBASTIAN; SALDARRIAGA, MÓNICA MARÍA; CUBIDES CUBILLOS, SERGIO; CUPITRA VERGARA, NELSON IVAN
    We report the distribution of the Centruroides edwardsii (Gervais, 1843) in the Antioquia province, and the urban area of the capital, Medellín, Colombia, based in the material examined in the collection of the Universidad de Antioquia Serpentarium (SUA). A sexual dimporphism were established in C. edwardsii when a multidimensional analysis and using for the statistical significance the ANOSIM model were performed founding higher measurments in males. An important colony of this scorpion is reported in the central and nor-oriental zone of Medellín, aspect that is very relevant since this scorpion is clinically importance. The species distribution rank is also expanded...

  14. Rizospheric Microbiota of Espeletia spp. from Santa Inés and Frontino-Urrao Paramos in Antioquia, Colombia

    LIZARAZO-MEDINA, Pilar Ximena; GÓMEZ-VASQUEZ, Diana
    The frailejón (Espeletia spp.) is the emblematic shrub of the paramo. This is an important ecosystem because they are sources of water and organic matter, and are inhabited by a high number of endemic biological species. Considering the importance of the microbiota in soil structure and nutrients availability to support plant growth, we assessed the cultivable microbial populations in Espeletia spp. rhizosphere in Santa Inés and Frontino-Urrao paramos, including functional groups with important role in cycling nutrients. The soil pH was strongly acid in both sites and the organic matter and nitrogen contents were highest in Frontino-Urrao soil. Nevertheless, the...

  15. Phytotoxic Activity of Stem Bark and Leaves of Blepharocalyx salicifolius (Myrtaceae) on Weeds

    HABERMANN, Eduardo; IMATOMI, Maristela; PEREIRA, Viviane De Cassia; PONTES, Flávia Cevithereza; GUALTIERI, Sonia Juliano Cristina
    In this study, the phytotoxicity of extracts and fractions of stem bark (suber) and mature leaves of Blepharocalyx salicifolius Kuth O. Berg was evaluated on the initial growth of Echinochloa crus- galli L. P. Beauv. (barnyardgrass) and Euphorbia heterophylla L. (wild poinsettia). The extracts were obtained by exhaustive extraction and fractionation by the partition coefficient with organic solvents. Subsequently, the ethyl acetate extracts of bark and mature leaves and bark hexane extract were fractionated by column chromatography with solvents in increasing order of polarity. The extracts and fractions were evaluated on weed species at concentrations of 0.2, 0.4 and 0.8 mg.mL-1, as positive control commercial herbicide...

  16. Echinoderms in Shallow-Bottom from Ahumadera Sector, Cispatá Bay, Cordoba, Colombian Caribbean

    QUIRÓS RODRÍGUEZ, Jorge Alexander
    This study represents a report of the echinoderm fauna found in shallow waters of the sector La Ahumadera, Cispatá Bay, Colombian Caribbean. The area is formed by a plain substrate type soft sand-mud colonized by sponges in punta Terraplén and sandy with seagrass (Thalassia testudinum), macroalgae and sponges in punta Robalo. Were identified ten species of echinoderms belonging to four classes (Asteroidea, Ophiuroidea, Echinoidea and Holothuroidea), distributed in eight families and nine genera. The number of taxa identified corresponds to 4.1% of the species recorded for the Colombian Caribbean, and shows the representation of species of echinoderms in this sector....

  17. A NEW LOCALITY OF THE HOODED ANTPITTA (GRALLARICULA CUCULLATA: GRALLARIDAE) FOR THE COLOMBIAN CENTRAL ANDES

    MARÍN GÓMEZ, OSCAR HUMBERTO; MARCELA POLANCO, Juliana; ARANGO GIRALDO, Daniel; OSPINA DUQUE, Albert
    We report a new locality record of the Hooded Anpitta (Grallariculla cucullata), a threatened species inhabiting montane cloud forests of the Colombian and Venezuelan Andes. This is the first record for Quindío department. We present capture-rate data at this site that suggests a resident, relatively large population.

  18. Seasonal Variation of the Genus Prorocentrum (DINOPHYCEAE) in Two Tuna Farms In The Bahía De La Paz, Mexico

    MUCIÑO-MÁRQUEZ, Rocio Elizabeth; GÁRATE-LIZÁRRAGA, Ismael; LÓPEZ-CORTÉS, David Javier
    The genus Prorocentrum Ehrenberg includes 81 marine species, of which 21 are considered causative agents of harmful algal blooms, and approximately 9 species produce toxins. The objectives of this study were to determine distribution and abundance of Prorocentrum species during an annual cycle at two sampling sites within tuna farms near San Juan de La Costa (SC), Rancheros del Mar (RM) and at a station without the influence of these farms located off El Mogote (M), in the Bahia de la Paz, Gulf of California. Samples were taken monthly (June 2006-May 2007) at different depths at SC (0, 25 and...

  19. Micromorphology and Histochemistry of the Laticifers from Vegetative Organs of Asclepiadoideae species (Apocynaceae)

    DEMARCO, Diego
    Micromorphology and main substances of the laticifer walls and latex of Asclepias curassavica, Fischeria stellata, Gonioanthela axillaris, Matelea denticulata, and Oxypetalum banksii were analyzed and compared with those of Apocynacean Cerrado species. Laticifers of the studied species from different rainforest vegetations exhibit similar features. The walls are primary, highly hydrated, pectic-cellulosic, and firmly attached to adjacent cell walls. The latex is milky white, constituted by polysaccharides, including mucilage, proteins, lipids, including fatty acids, phenolic compounds, and alkaloids; however, Fischeria and Gonioanthela differ from the other species for also producing neutral lipids. The latex of the investigated species is related to...

  20. USE OF FOOD RESOURCES BY DETRITIVOROUS FISH IN FLOOD-PLAINS: A SYNTHESIS

    AMADEU SANTANA, ANA RUTE; WERTH, MARTIN; BENEDITO, EVANILDE
    The present review investigated the sources of energy for detritivorous fish species in floodplains. Recent studies have shown that environmental changes that alter the terrestrial vegetation affect essentially the resource base in these areas, such as the detritus. In aquatic environments, especially floodplains, a major part of metabolic processes is supported by terrestrial detritus, which accounts for maintaining the detritivorous food chain. Thus, one way to evaluate environments changes is through isotopic studies of organic matter, which allows acquiring information about the quantity and quality of organic matter. This approach is required for understanding the interactions between the organic matter...

Aviso de cookies: Usamos cookies propias y de terceros para mejorar nuestros servicios, para análisis estadístico y para mostrarle publicidad. Si continua navegando consideramos que acepta su uso en los términos establecidos en la Política de cookies.