Mostrando recursos 101 - 120 de 1,676

  1. Caracterización aeropalinológica del bioaerosol atmosférico de Cartagena

    Elvira Rendueles, Belén
    En el trabajo se presenta el resultado del estudio cualitativo y cuantitativo de pólenes y esporas fúngicas aerovagantes de la ciudad de Cartagena así como su comportamiento en relación con la meteorología. Se han identificado un total de 44 tipos polínicos pertenecientes a 36 familias de las que el 48,9% son pólenes de plantas herbáceas, el 45,6% árboles o arbustos y un 4,6% son gramíneas. Se ha realizado el Calendario Polínico, siendo los taxones predominantes Irticaceae, Cupressaceae, Chenopodiaceae-Amaranthaceae, Pinaceae, Oleaceae, Poaceae, Quercus, Plantago, Plantanus, Populus, Artemisia, Eucalyptus, Arecaceae y Zygophyllum. La primavera es la estación en la que se encuentran las mayores...

  2. Estudio agronómico y fisiológico del albaricoquero en condiciones de infradotacion hídrica

    Pérez Pastor, Alejandro
    En albaricoqueros jóvenes cultivados en maceta se realizaron dos ensayos encaminados a mejorar el conocimiento de la respuesta a condiciones ambientales adversas típicas del clima mediterráneo: largos periodos de sequía y ocasionales precipitaciones intensas. Estos ensayos permitieron caracterizar los mecanismos de valor adaptativo desarrollados en albaricoquero para afrontar situacioines de sequía o de inundación, derivándose de ellos prácticas de manejo del cultivo de gran interés, tales como la mayor resistencia del portainjerto ciruelo a la inundación y el endurecimiento de la planta frente a condiciones de sequía favoreciéndose, de esta forma, la supervivencia de las plantas tras el trasplante. En árboles...

  3. Por una reforma de la legislación matrimonial civil

    Soto Gómez, Jaime
    El derecho rige en el tiempo y en el espacio, para el diario vivir; por lo cual necesita auxiliares de las reglas de la experiencia, de lo que el mejicano Rafael de Pina, en su Tratado de las Pruebas Civiles, llama "la ciencia de la vida"; el cual, citando a Latemandi y aludiendo a Ortega y Gasset, dice que "quien no sabe sino derecho ni derecho sabe".Ellas son necesarias para legislar, para interpretar la ley y los contratos y para apreciar la prueba. (…)

  4. De las ciencias a la vida o sobre la productividad en la Ciénaga de Ayapel y su praccis

    González Agudelo, Elvia María; Aguirre Ramírez, Néstor Jaime
    The praccis teaching’s strategy looks for, to translate dialogically, something strange, something from the world of science, into an approaching or perhaps something of his self, in the world of life. The scientist facts in this case, the strange thing, are the results of research on productivity in Ayapel´s swamp, Colombia, which is mediated by the praccis teaching strategy, in order to come closer to the people, who live in the same location, to facilitate the movement of knowledge. This research is made up of four parts: a first rigorously exposition of how productivity in Ayapel´s swamp is; a second...

  5. Aplicación de métodos de aprendizaje automático para el estudio de la comorbilidad inversa entre cáncer y trastornos del sistema nervioso central

    Ibáñez Garikano, Kristina
    La cantidad de datos biológicos y médicos que se produce hoy en día es enorme, y se podría decir que el campo de las ciencias de la vida forma parte ya del club del Big Data. Estos datos contienen información crucial que pueden ayudar a comprender mejor los mecanismos moleculares en los sistemas biológicos. Este conocimiento es fundamental para el progreso en el diagnóstico y en el tratamiento de las enfermedades. La Bioinformática, junto con la Biología Computacional, son disciplinas que se encargan de organizar, analizar e interpretar los datos procedentes de la Biología Molecular. De hecho, la complejidad y...

  6. Vida, verdad y error en el último Foucault

    Monge, Julia
    A partir del análisis de uno de los últimos textos que escribió M. Foucault, a saber, �La vida: la experiencia y la ciencia� (1984), en el presente artículo nos proponemos reconstruir la relación entre las problematizaciones del autor y el pensamiento de uno de sus maestros: Georges Canguilhem. Siguiendo las líneas argumentales que se despliegan en tal artículo, consideramos que es posible reconocer un segundo nivel de lectura del mismo, que se correspondería a un segundo nivel de escritura: Foucault no sólo estaría exponiendo allí la importancia que reportaron las investigaciones de Canguilhem para los problemas de la época, sino...

  7. Profesionalizando la política: desde el periodo clásico hasta la calidad de la democracia

    Alcántara Sáez, Manuel
    El presente artículo tiene por finalidad encajar el estudio de los políticosen la ciencia política. Se presentan cinco apartados. En el primero se aborda el papel de los políticos y la forma de su estudio en la Grecia clásica y en la Italia del Renacimiento. En el segundo apartado se plantea en qué forma el peso de las instituciones y, más tarde, de la crisis de la democracia afectan la consideración del papel de los políticos. Seguidamente, las partes tres y cuatro se aproximan a la psicología y a las ciencias de la vida para conocer los aportes realizados al estudio de la política. Finalmente...

  8. Variation in spatial distribution of juvenile loggerhead turtles in the eastern Atlantic and western Mediterranean Sea

    Monzón Argüello, Catalina; Rico, Ciro; Carreras, Carlos; Calabuig, P.; Marco, Adolfo; López-Jurado, Luis Felipe

    [EN] Loggerhead sea turtles (Caretta caretta) originating from the Western Atlantic carry out one of the largest marine migrations, reaching the eastern Atlantic and Mediterranean Sea. It has been proposed that this transatlantic journey is simply a consequence of drifting, with the lack of a target destination and a passive dispersal with oceanic currents. This predicts that the size of the source populations and geographic distance to the feeding grounds should play important roles in defining stock composition in the eastern Atlantic and Mediterranean Sea.


  9. Twelve new polymorphic microsatellite markers from the loggerhead sea turtle (Caretta caretta) and cross-species amplification on other marine turtle species

    Monzón Argüello, Catalina; Muñoz, Joaquín; Marco, Adolfo; López-Jurado, Luis Felipe; Rico, Ciro

    [EN] We describe 12 new polymorphic dinucleotide microsatellite loci and multiplex Polymerase Chain Reaction conditions from the loggerhead sea turtle Caretta caretta. Levels of polymorphism were assessed in 50 individuals from the nesting population of the Cape Verde Islands.


  10. Population structure and conservation implications for the loggerhead sea turtle of the Cape Verde Islands

    Monzón Argüello, Catalina; Rico, Ciro; Naro Maciel, Eugenia; Varo Cruz, Nuria; López, Pedro; Marco, Adolfo; López-Jurado, Luis Felipe

    [EN] The Cape Verde Islands harbour the second largest nesting aggregation of the globally endangered loggerhead sea turtle in the Atlantic. To characterize the unknown genetic structure, connectivity, and demographic history of this population, we sequenced a segment of the mitochondrial (mt) DNA control region (380 bp, n = 186) and genotyped 12 microsatellite loci (n = 128) in females nesting at three islands of Cape Verde. No genetic differentiation in either haplotype or allele frequencies was found among the islands (mtDNA FST = 0. 001, P > 0. 02; nDNA FST = 0. 001, P > 0. 126). However,...

  11. Genetic characterization of eastern Atlantic hawksbill turtles at a foraging group indicates major undiscovered nesting populations in the region

    Monzón Argüello, Catalina; Rico, Ciro; Marco, Adolfo; López, Pedro; López-Jurado, Luis Felipe

    [EN] Despite the considerable population genetic and connectivity research on the hawksbill sea turtle (Eretmochelys imbricata) and the species being critically endangered, the eastern Atlantic remains understudied. We present the first analysis of mitochondrial DNA (mtDNA) sequences (n = 28) of hawksbill juveniles in a foraging aggregation at the Cape Verde Islands. Our results showed three haplotypes non-reported in any nesting population to date, with one of them accounting for 68% of the samples. These three haplotypes were closely related to each other but highly divergent from all known Caribbean and Western Atlantic haplotypes.


  12. Fusarium solani is responsible for mass mortalities in nests of loggerhead sea turtle, Caretta caretta, in Boavista, Cape Verde

    Sarmiento-Ramírez, Jullie M.; Abella Pérez, Elena; Martín, María P.; Tellería, María T; López-Jurado, Luis Felipe; Marco, Adolfo; Diéguez-Uribeondo, Javier

    [EN] The fungus Fusarium solani (Mart.) Saccardo (1881) was found to be the cause of infections in the eggs of the sea turtle species Caretta caretta in Boavista Island, Cape Verde. Egg shells with early and severe symptoms of infection, as well as diseased embryos were sampled from infected nests. Twenty-five isolates with similar morphological characteristics were obtained. Their ITS rRNA gene sequences were similar to the GenBank sequences corresponding to F. solani and their maximum identity ranged from 95% to 100%.


  13. Evidence from genetic and Lagrangian drifter data for transatlantic transport of small juvenile green turtles

    Monzón Argüello, Catalina; López-Jurado, Luis Felipe; Rico, Ciro; Marco, Adolfo; López, Pedro; Hays, Graeme; Lee, Patricia

    [EN] Aim: A key life-history component for many animals is the need for movement between different geographical locations at particular times. Green turtle (Chelonia mydas) hatchlings disperse from their natal location to spend an early pelagic stage in the ocean, followed by a neritic stage where small juveniles settle in coastal areas. In this study, we combined genetic and Lagrangian drifter data to investigate the connectivity between natal and foraging locations. In particular, we focus on the evidence for transatlantic transport.


  14. Abundance and exploitation of loggerhead turtles nesting in Boa Vista Island, Cape Verde: The only substantial rookery in the eastern Atlantic.

    Marco, Adolfo; Abella Pérez, Elena; Liria-Loza, Ana; Martins, Samir; López, Óscar; Jiménez Bordón, Saray; Medina, M; Oujo-Alamo, Carolina; Gaona, Pilar; Godley, B. J; López-Jurado, Luis Felipe

    [EN] The main nesting area for loggerhead turtles in the eastern Atlantic is in the Cape Verde Islands, largely restricted to the island of Boa Vista. Extensive monitoring demonstrated a globally significant population for the species despite a sustained high level of anthropogenic take of nesting females for local consumption. Through an extensive stratified monitoring program across the island in the seasons 2007-2009, we estimated a total of 13955, 12028 and 19950 clutches in the 3 years, respectively. These values indicate that the mean number of nesting females averaged 3700. Considering that a female breed, on average, every 2.4 years,...

  15. Primeras evidencias de la supervivencia del escinco gigante de Cabo Verde, Macroscincus coctei (Duméril & Bibron, 1839)

    Mateo, José Antonio; López-Jurado, Luis Felipe; García Márquez, Marcos

    [ES] La controvertida historia del escinco gigante de Cabo Verde, Macroscincus coctei, se ha convertido con el tiempo en uno de los ejemplos clásicos que sirven para ilustrar modelos de extinción en islas (Pregill, 1986). Sin embargo, son muchos los que siguen preguntándose si en esta especie el proceso ha llegado a su fin, o si por el contrario aún cabe la posibilidad de encontrar pequeñas poblaciones que permitan recuperarla (Schleich, 1979; Andreone & Gavetti, 1998; Carranza et al., 2001).


  16. Influence of loggerhead egg agregation on survival: why does single eggs buried into natural sand dye in few days?

    Domínguez, Jara; Marco, Adolfo; García Cerdá, Rosa María; Abella Pérez, Elena; Vieira, Sara; López-Jurado, Luis Felipe

    [EN] The incubation is an essential life period for oviparous species that very often experiences a high mortality. In some reptile species the number of eggs that develop together in the incubation chamber affects survival and hatchling phenotype. Sea turtle eggs develop in underground locations on sandy beaches in large masses that usually have more than 80 eggs. Natural egg mortality seems to vary among species and for the sensitive leatherbacks, external eggs seems to survive better than internal ones within the nest.


  17. Genetic characterization of hawksbill juveniles foraging at Cape Verde islands indicates major undiscovered nesting populations in the region

    Monzón Argüello, Catalina; Rico, Ciro; Marco, Adolfo; López, Pedro; López-Jurado, Luis Felipe

    [EN] The hawksbill sea turtle (Eretmochelys imbricata) is a circumglobal tropical species listed as Critically Endangered by the IUCN. While it is known that at least one stock occurs around the rookeries of São Tome and Principe and Bioko Islands, the eastern Atlantic remains genetically unexplored. We present the first analysis of mitochondrial DNA (mtDNA) sequences (n = 28) of hawksbill juveniles in a foraging aggregation at the Cape Verde Islands, an archipelago located in the eastern Atlantic. The mean size (minimun curve carapace length) of the studied individuals was 42.45 cm.


  18. Experimental study about the impact of artificial lighting on loggerhead female nesting in Cape Verde.

    Abu Raya, Mara; Cruz, Eder; Marco, Adolfo; López-Jurado, Luis Felipe

    [EN] Artificial illumination of nesting beaches is one of the main threats to endangered sea turtle populations. Nocturnal lighting can impair female nest site selection and nesting success, as well as behavior and hatchling survival in their way from the nest surface to the seashore. The island of Boavista (Cape Verde) hosts the third largest loggerhead nesting aggregation in the world and the only relevant population in the Eastern Atlantic coast. Several threats such as fishing by-catch and female slaughter during nesting are severely threatening its conservation.


  19. Effects of light pollution by car headlights on loggerhead hatchlings in Cape Verde

    Santos-García, Vanesa; Marco, Adolfo; López-Jurado, Luis Felipe

    [EN] Many sea turtle nesting areas are experiencing a tremendous growth in tourism during the last decades that will likely continue in the near future. Many touristic activities involve light pollution by the increasing presence of vehicles close or even over the beaches. Vehicles can drive towards or along the beaches and even stay with the lights turned on illuminating during prolonged periods of time significant zones with sea turtle nesting activity. Thus, it is important to evaluate the impact of car light pollution on both nesting females and newborns in their search of the sea.


  20. Pathogenic effect of microorganisms on loggerhead eggs

    Abella Pérez, Elena; Marco, Adolfo; Diéguez-Uribeondo, Javier; López-Jurado, Luis Felipe

    [EN] Different types of fungi and bacteria have been isolated from hatched and non-hatched as well as failed and non-failed eggs in natural sea turtles nests (Marco et al. 2006, Phillott and Parmenter, 2001, Phillott et al. 2001). Microbiota infections are common in artificial incubation activities and they seem to have an important negative impact on embryo development (Phillott, 2002). However, no clear evidences of their pathogenic effects have been described. The aim of this study was to investigate whether fungi and bacteria represent pathogenic agents to sea turtle eggs, and to assess whether there exists a specific period during...

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