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Introduccion: La valoracion clinica del RVO mediante el Head Impulse Test, es clinicamente dificil en pacientes con nistagmos de la mirada y congenitos ya que estas baten en el mismo sentido que las sacadas de refijacion, confundiendo... more
Introduccion: La valoracion clinica del RVO mediante el Head Impulse Test, es clinicamente dificil en pacientes con nistagmos de la mirada y congenitos ya que estas baten en el mismo sentido que las sacadas de refijacion, confundiendo como sacadas de refijacion a las batidas propias del nistagmo. Objetivo: Determinar cual de los test impulsivos cefalicos conocidos, tanto en modo HIMP como en modo SHIMP (mediante uso de la vincha), es mas eficiente en la valoracion del RVO clinico, en pacientes con nistagmos espontaneos de la mirada y congenitos. Material y Metodo: Se analizaron dos pacientes, uno con nistagmo congenito y otro con nistagmo de la mirada, evaluando en cada uno de ellos tres pruebas semiologicas: HIMP de adentro afuera, HIMP de afuera adentro y SHIMP usando vincha SHIMP. Se midio la ganancia del RVO mediante VHIT. Se registraron los test mediante filmacion de los mismos. Resultados: Paciente N°1: nistagmo congenito y RVO deficitario bilateral, durante el HIMP de adentro afuera, se observaron sacadas de refijacion bilaterales, las cuales se confunden con las batidas nistagmicas. En HIMP de afuera adentro, resulto dificultoso visualizar la presencia de sacadas en forma bilateral. En cambio, la vincha SHIMP, no se observaron sacadas de refijacion evidenciando el deficit del RVO. Paciente N°2: nistagmo de la mirada con RVO deficitario a izquierda, durante el HIMP de adentro afuera, se observaron sacadas de refijacion en forma bilateral, confundiendose con las batidas nistagmicas. En HIMP de afuera adentro, resulto dificultoso visualizar la presencia de sacadas en forma bilateral. Con la vincha SHIMP, solo se observaron sacadas de refijacion a derecha y no a izquierda. Conclusion: La vincha SHIMP, evita error en la valoracion del RVO clinico de pacientes con nistagmo congenito y de la mirada. III. Topico 08 Nuevas pruebas en funcion vestibular
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Vegetation structure and composition, and parameters of the bird community (richness and abundance) were studied in managed beech-fir forests in Navarre (Spain). Relationships between bird parameters and vegetation variables differed in... more
Vegetation structure and composition, and parameters of the bird community (richness and abundance) were studied in managed beech-fir forests in Navarre (Spain). Relationships between bird parameters and vegetation variables differed in different avian nesting guilds. Whereas secondary cavitynesting bird parameters were not significantly related to any vegetation variable, both richness and abundance of bird species that do not rely on existing holes for breeding increased with the proportion of fir trees, but only in the breeding season. Nest-site selection might be the key factor behind this relationship, since firs would provide more suitable nest-sites than beeches for these species, perhaps because beech leaves are not fully developed early in the breeding season. Moreover, during the winter season richness of birds that do not rely on existing holes for breeding was positively related to the percentage of shrub cover. Although this result should be considered with caution, pro...
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RESUMEN: Objetivo: Desarrollar una herramienta semiologica que permita estimar la ganancia del Reflejo Vestibulo Oculomotor (RVO). Metodo: Estudio prospectivo y descriptivo de serie de casos clinicos donde se analizo la funcion de 732... more
RESUMEN: Objetivo: Desarrollar una herramienta semiologica que permita estimar la ganancia del Reflejo Vestibulo Oculomotor (RVO). Metodo: Estudio prospectivo y descriptivo de serie de casos clinicos donde se analizo la funcion de 732 canales semicirculares horizontales de individuos con diferentes ganancias que acudieron por presentar algun sintoma vinculado al area de neurotologia, realizado en la ciudad de Montevideo-Uruguay, entre el mes marzo del 2017 a marzo del 2018. Se evaluo HIMP, SHIMP clinicos y se comparo la amplitud de sus sacadas evidentes entre si, se compararon los hallazgos clinicos contra ganancias medidas con VHIT para determinar ganancias del RVO. Resultados: El 95% de los HIMP (-) tienen ganancias RVO entre 0.71-1.25.El 75% de HIMP dudosos (?) tienen ganancias > a 0.73. En HIMP (+) el 50% tiene un RVO > 0.75. Interpretandose como valores RVO normales >/= 0.75. El 75% de la configuracion HIMP dudoso, SHIMP (+) , y SHIMP> HIMP, tienen ganancia RVO >...
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ABSTRACT
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Research Interests: Evolutionary Biology, Mate Choice, Sexual Selection, Biology, Ecology, and 15 moreAnimal Ecology, Evolutionary Ecology, Allometry, Trait, Body Size, Coefficient of Variation, Stabilizing Selection, Mate Preference, Phenotypic variation, Intraspecific Competition, Condition dependence, Feather, Total Variation, directional selection, and Environmental factor
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Research Interests: Electrical Engineering, Electronic Engineering, Telecommunications Engineering, Zoology, Ornithology, and 12 moreElectronics, Biology, Food supply, Body Size, Environmental Conditions, Body Mass, Condition dependence, Hematocrit, ENVIRONMENTAL SCIENCE AND MANAGEMENT, packed red blood cells, Blood volume pulse, and Cellular immune response
The static allometry of secondary sexual characters is currently subject to debate. While some studies suggest an almost universal positive allometry for such traits, but isometry or negative allometry for nonornamental traits, other... more
The static allometry of secondary sexual characters is currently subject to debate. While some studies suggest an almost universal positive allometry for such traits, but isometry or negative allometry for nonornamental traits, other studies maintain that any kind of allometric pattern is possible. Therefore, we investigated the allometry of sexually size dimorphic feather ornaments in 67 species of birds. We also studied the allometry of female feathers homologous to male ornaments (female ornaments in the following) and ordinary nonsexual traits. Allometries were estimated as reduced major axis slopes of trait length on tarsus length. Ornamental feathers showed positive allometric slopes in both sexes, although that was not a peculiarity for ornamental feathers, because nonsexual tail feathers also showed positive allometry. Migration distance (in males) and relative size of the tail ornament (in females) tended to be negatively related to the allometric slope of tail feather orna...
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The ancestral conditions that permit the evolution of extravagant secondary sexual characters are of considerable theoretical and empirical interest because they allow identification of necessary ecological conditions, but also allow... more
The ancestral conditions that permit the evolution of extravagant secondary sexual characters are of considerable theoretical and empirical interest because they allow identification of necessary ecological conditions, but also allow empirical tests of models of female mate preferences. We investigated the ancestral and derived state of a range of ecological and evolutionary variables that might have been implicated in the evolution of secondary sexual characters. Extravagant feather ornaments have evolved independently at least 70 times in birds, and the context of these evolutionary events was investigated statistically. The acquisition of feather ornaments was significantly associated with a change in social mating system from monogamy to polygyny or lekking. This association is consistent with the Fisherian mechanism of sexual selection. However, very often also the acquisition of feather ornaments occurred without change in mating system. Therefore, ornamentation can develop fo...
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Some studies have suggested that tail streamers in the barn swallow Hirundo rustica may have been elongated 10–12 mm by sexual selection, but according to other studies, the length of these feathers is at the aerodynamic optimum or very... more
Some studies have suggested that tail streamers in the barn swallow Hirundo rustica may have been elongated 10–12 mm by sexual selection, but according to other studies, the length of these feathers is at the aerodynamic optimum or very close to it. To shed light on this issue, outermost tail feathers were experimentally shortened in male and female barn swallows by 1, 11 or 21 mm. Changes in four physiological parameters commonly used to estimate phenotypic condition in birds (weight, erythrocyte sedimentation rate, blood leukocyte concentration and heterophil/lymphocyte ratio) were checked one month later. Health improved (blood leukocyte concentration decreased) in the group of birds with tails shortened by 11 mm (both males and females), but body condition deteriorated (weight decreased) compared to the other two experimental groups. There was no significant effect of tail‐length manipulation on the other two physiological parameters. These contradictory results suggest trade‐of...
Research Interests: Zoology, Sexual Selection, Biology, Avian Biology, Biological Sciences, and 5 morePhenotype, Barn Swallow, Barn, Feather, and Wing
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At the beginning of the breeding season, the outermost tail feathers of 31 male Barn Swallows Hirundo rustica were either shortened by 20 mm, elongated by 20 mm or left unmanipulated. In first broods, the number of feeding bouts (per... more
At the beginning of the breeding season, the outermost tail feathers of 31 male Barn Swallows Hirundo rustica were either shortened by 20 mm, elongated by 20 mm or left unmanipulated. In first broods, the number of feeding bouts (per nestling per hour) by males and females did not differ significantly among experimental groups. However, in second broods, males with elongated tails fed their nestlings less often than males with shortened or unmanipulated tails. Male tail elongation may have been detrimental to flight, making capture of insects more difficult. Females paired to long‐tailed males did not compensate for this reduction in feeding by males and their nestlings received less food. Neither feeding rates nor brood size differed significantly between first and second broods. Variation in abundance of large insects at different times of the day (high around noon and low in the morning and afternoon) matched variation in feeding rates, supporting the importance of large insects ...
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Research Interests: Environmental Science, Environmental Chemistry, Environmental Pollution, Medicine, Multidisciplinary, and 15 moreHeavy Metal Pollution, Animals, Biomonitoring, Trace Elements, Feathers, Human Activity, Interspecific competition, Antarctic Peninsula, Trace element, Environmental Pollutants, Large Scale, Feather, Environmental, Environmental Exposure, and Spheniscidae
Localización: Estudios sobre comportamiento animal: XXV años de la Sociedad Española de Etología (1984-2009)/coord. por Juan Carranza Almansa, Juan Moreno Klemming, Manuel Soler Cruz, 2010, ISBN 978-84-7723-920-8, págs. 153-160
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... Dr. José René Mesa Cuervo, Dr. Edgardo Espinosa Martínez, Dr. Carlos Hernández Padrón, Dr. Rafael Losada Buchillón, Dra. Alelí Plasencia Ternblón y Dr. Porfirio Hernández Ramírez RESUMEN. ... Hodgkin's disease. En: DeVita VT,... more
... Dr. José René Mesa Cuervo, Dr. Edgardo Espinosa Martínez, Dr. Carlos Hernández Padrón, Dr. Rafael Losada Buchillón, Dra. Alelí Plasencia Ternblón y Dr. Porfirio Hernández Ramírez RESUMEN. ... Hodgkin's disease. En: DeVita VT, Hellman S, Rosenberg S. Cancer. ...