Papers by Valeria Jimena Pinzas Guzman
Protrepsis. Revista de filosofía, May 7, 2019
Oxford Medical Case Reports, Jun 1, 2018
This is a case of severe unilateral lower leg oedema in a 77-year-old man, due to a spontaneous, ... more This is a case of severe unilateral lower leg oedema in a 77-year-old man, due to a spontaneous, complete Achilles tendon rupture. What makes this case unusual is the absence of trauma in the patient's history. The correct diagnosis was made only after magnetic resonance imaging. However, a thorough clinical re-examination of the patient revealed an inability to stand and walk on toes and a palpable defect of the Achilles tendon, which was difficult to detect due to the marked oedema. This case reminds physicians that an Achilles tendon rupture can also occur without clear history of trauma and should be considered as a cause of unilateral lower leg oedema, especially in presence of pain. Moreover, it illustrates the crucial role of a thorough clinical examination (including standing and walking on toes) for the correct diagnosis, even when restricting factors such as oedema and pain are present.
Revistarquis, Nov 14, 2014
El presente proyecto de graduación es un compendio de animaciones relacionadas con la unidad didá... more El presente proyecto de graduación es un compendio de animaciones relacionadas con la unidad didáctica "Conceptos Relativistas" perteneciente a la Física Moderna. Mediante el uso del programa Modellus se han elaborado varias animaciones, las mismas que se han clasificado en: Conceptuales, Ejercitativas y Lúdicas. Las primeras presentan al usuario toda la parte teórico-conceptual correspondiente al tema de una manera clara, precisa y concreta; las segundas le permiten al usuario la interacción entre el computador y él, poniendo de manifiesto de una forma recreada el conocimiento adquirido a través de las animaciones conceptuales; mientras que las últimas permiten demostrar habilidades de tipo mental y manual ya que las mismas serán puramente interactivas. Como parte complementaria, hemos elaborado una guía que contiene un resumen adecuado de cada tema, el cual irá con los códigos de sus respectivas animaciones y una animación de muestra con su respectiva descripción, para que de esta forma el usuario pueda utilizarlo correctamente y pueda facilitar su comprensión. Además presentamos un resumen muy operativo acerca del programa informático Modellus, para que los usuarios lo conozcan y aprendan.
Escena Revista De Las Artes, 2006
octubre-11 diciembre 2005] para explorar algunos de los efectos que ha provocado el turismo, la a... more octubre-11 diciembre 2005] para explorar algunos de los efectos que ha provocado el turismo, la actual industria más grande del mundo. Este escrito se sitúa entre la forma del ensayo y la reseña. Permite, mediante el repaso de una experiencia artística en particular, abordar aspectos del turismo que han sido poco explorados. A pesar de que el turismo es un campo de estudio bien establecido en la sociología y la antropología, ha sido poco analizado desde los puntos de vista arquitectónico, urbano, paisajístico y artístico. El objetivo es introducir esta problemática sobre todo en un país como Costa Rica, cuyo espacio y realidad están siendo modeladas a imagen y semejanza de la voluntad de esta gran industria.
Escena Revista De Las Artes, 2004
Seasonal variation of the macro-arthropod community associated to Tillandsia carlos-hankii (Bromeliaceae) in an oak-pine forest in Oaxaca, Mexico
ABSTRACT Here we describe the seasonal variation of the macroarthropod community associated to Ti... more ABSTRACT Here we describe the seasonal variation of the macroarthropod community associated to Tillandsia carlos-hankii Makuda (Bromeliaceae) in a deciduous forest located at “Petenera”, Santa Catarina Ixtepeji, Oaxaca, Mexico. Eight T. carlos-hankii specimens were collected during the wet season and 10 during dry season. We recorded 874 macroarthropod individuals, belonging to one phylum, four classes, 17 orders, 60 families and 81 morphospecies. The richest order was Araneae (21 morphospecies), from which Salticidae (4 spp.), Staphylinidae (4 spp.) and Lygaeidae (4 spp.) were the most abundant families. Richness at the family and morphospecies level was significantly higher during the dry season (44 vs. 37, and 57 vs. 48, respectively). Likewise, abundance was also greater during the dry season (468 vs. 215). Overall, Araneae was the most abundant order represented by 173 individuals, whereas Blattellidae was the most abundant family (142 individuals). The most abundant morphospecies were: Parcoblatta sp. 1, Tipula sp. 1, Phloeopora sp. 1, Scytodes aff. thoracica and Underwoodia sp. 1. The proportion of individuals belonging to each feeding guild was as follows: 50% zoophagous (represented by Phloeopora sp. 1, Staphylinidae), 33% were herbivores (represented by Tipula sp. 1, Tipulideae), and 17% were detritivores (represented by Parcoblatta sp.1, Blattellidae). Richness differed significantly among guilds during both seasons: zoophagous were more species-rich than the detritivore guild. In addition, abundance differed significantly between guilds during the dry season (zoophagous were most abundant), but was similar during the wet season. Finally, alpha diversity was similar between seasons (wet season: H’ = 3,27, dry season: H’ = 3,28; p › 0,05). Our results show that there is still much that needs to be explored regarding bromeliad-arthropod interactions, and that further investigations should consider seasonal changes in arthropod richness, composition and abundance associated to this plant family.
Grasas y Aceites, 2002
RESUMEN Extracción de componentes antioxidantes del tegumento seminal de maní. El objetivo del tr... more RESUMEN Extracción de componentes antioxidantes del tegumento seminal de maní. El objetivo del trabajo fue extraer sustancias antioxidantes del tegumento de las semillas de maní usando diferentes tipos de solventes y determinar la actividad antioxidante de los extractos. Extractos metanólicos, etanólicos, acetónicos y acuosos fueron preparados desde tegumento de maní desengrasado y sin desengrasar. Sobre los extractos se determinaron los contenidos de materia seca y fenoles totales, actividad secuestrante de radicales libres y la actividad antioxidante sobre aceite de girasol. El tegumento de maní usado en este trabajo tuvo la siguiente composición porcentual: 16.60% de aceite, 12.32% de proteínas, 2.83% de cenizas y 69.8% de otros componentes. Alto contenido de materia seca se encontró en extractos metanólicos (17.11%), etanólicos (17.70%) y acetónicos (18.54%) de tegumentos sin desengrasar. Menor contenido de materia seca mostró el extracto acetónico de tegumento desengrasado que él de el tegumento no desengrasado. Alto contenido de fenoles totales fue detectado en extractos metanólicos (158.6 mg/g) y etanólicos (144.1 mg/g) del tegumento de maní desengrasado. Además estos dos últimos extractos a concentraciones de 1µg/mL tuvieron una actividad secuestrante de radicales libres que fueron de 32.59% y 31.5%, respectivamente. Todos los extractos (0.05% p/p) en aceite de girasol presentaron actividad antioxidante. La actividad antioxidante de los extractos fue menor que la que presentó el BHT.
Mammalian Biology - Zeitschrift für Säugetierkunde, 2005
Rabbit pups are only nursed for about 3 min once a day. They depend on a pheromone on the mother'... more Rabbit pups are only nursed for about 3 min once a day. They depend on a pheromone on the mother's ventrum to locate nipples and on tactile stimulation of the muzzle to grasp them. In a continuing study of the sensory input guiding suckling behavior we investigated the whisker array in newborn pups and the possible contribution of the whiskers to suckling. Rabbits are born with approximately 76 whiskers arranged in seven to nine rows and increasing in length from rostral to caudal. No significant difference was found between pups with whiskers cut and intact controls in latency to perform the stereotyped nipple-search behavior, latency to attach to nipples, time spent on nipples, milk ingested, or in the strength of conditioning to a novel odor paired with suckling. Thus, the whiskers do not seem important for suckling in newborn rabbits.
Journal of Tropical Ecology, 2002
The arthropod fauna inhabiting 90 individuals of three different species of epiphyte was investig... more The arthropod fauna inhabiting 90 individuals of three different species of epiphyte was investigated in the moist lowland forest of the Barro Colorado National Monument in Panama. In total, 3694 arthropods belonging to 89 morphospecies and 19 orders were collected. While arthropod abundance was primarily a function of host plant biomass irrespective of epiphyte species, there were pronounced differences in species richness, species composition and guild structure of the arthropod faunas of the three epiphyte species. Although all study plants were growing in close proximity on the same host tree species, there was remarkably little overlap in the species assemblages across epiphyte taxa. The inhabitant species also differed dramatically in their ecological functions, as feeding guild and hunting guild analyses indicated. The influence of plant size, structure and impounded leaf litter on arthropod diversity is discussed. We conclude that epiphytes are microhabitats for a diverse an...
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Papers by Valeria Jimena Pinzas Guzman