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Search Results: 1 - 10 of 282419 matches for " Juan Carlos Windfield-Pérez "
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Registro de Pseudoeurycea mixteca (Caudata: Plethodontidae) en una cueva de Tehuacán, Puebla
Windfield-Pérez, Juan Carlos;Parra-Olea, Gabriela;Hernández-Zárate, Lisbeth;
Revista mexicana de biodiversidad , 2007,
Abstract: adult organisms of pseudoeurycea mixteca were found in a cave of about 80 meters deep at a xerophile vegetation in the tehuacan valley, puebla. the specimens were located under stones in humid sand. previous reports of this species were from pine-oak forest in northwestern oaxaca, living under the bark of logs or inside rotten logs. this new record increases the known distribution of the species and habitat type.
Registro de Pseudoeurycea mixteca (Caudata: Plethodontidae) en una cueva de Tehuacán, Puebla Record of Pseudoeurycea mixteca (Caudata: Plethodontidae) in a cave of Tehuacán, Puebla
Juan Carlos Windfield-Pérez,Gabriela Parra-Olea,Lisbeth Hernández-Zárate
Revista mexicana de biodiversidad , 2007,
Abstract: Se encontraron organismos de Pseudoeurycea mixteca en el interior de una cueva a 80 metros de profundidad en una zona de vegetación xerófila en el Valle de Tehuacán, Puebla. Los ejemplares fueron hallados bajo piedras en la arena húmeda. Los registros previos de P. mixteca corresponden únicamente a vegetación de bosque de pino-encino en el noroeste de Oaxaca donde vive bajo la corteza de árboles caídos o en troncos podridos. Este nuevo registro incrementa el área de distribución y el tipo de hábitat para la especie. Adult organisms of Pseudoeurycea mixteca were found in a cave of about 80 meters deep at a xerophile vegetation in the Tehuacan Valley, Puebla. The specimens were located under stones in humid sand. Previous reports of this species were from pine-oak forest in northwestern Oaxaca, living under the bark of logs or inside rotten logs. This new record increases the known distribution of the species and habitat type.
Angiostoma lamotheargumedoi n. sp. (Nematoda: Angiostomatidae) from the intestine of Pseudoeurycea mixteca (Caudata: Plethodontidae) in central Mexico Angiostoma lamotheargumedoi n. sp. (Nematoda: Angiostomatidae) del intestino de Pseudoeurycea mixteca (Caudata: Plethodontidae) en la región central de México
Jorge Falcón-Ordaz,Berenit Mendoza-Garfias,Juan Carlos Windfield-Pérez,Gabriela Parra-Olea
Revista mexicana de biodiversidad , 2008,
Abstract: A new species of Angiostoma (Angiostomatidae) is described from the intestine of the plethodontid salamander, Pseudoeurycea mixteca from Puebla State, in central Mexico. The new species closely resembles Angiostoma limancis, Angiostoma kimmeriensis, Angiostoma spiridonovi, Angiostoma stammeri, and Angiostoma carettae, because they all possess 8 pairs of pedunculate papillae in the caudal region; however, the new species can be distinguished by the unique arrangement of papillae, with 1 pre-cloacal pair, and 7 post-cloacal pairs. Among the 12 congeneric species of Angiostoma described so far, 2 have been described as parasites of salamanders, Angiostoma plethodontis from Plethodon cinereus and Plethodon richmondi in Virginia, USA, and Angiostoma onychodactyla from Onychodactylus japonicus in Japan. Angiostoma lamotheargumedoi n. sp. is readily distinguished from these 2 species by the presence of lateral alae and by the number of pre-cloacal papillae. En este trabajo se describe una especie nueva del género Angiostoma (Angiostomatidae) como parásito del intestino de la salamandra pletodóntida Pseudoeurycea mixteca en el estado de Puebla, en el centro de México. La nueva especie es morfológicamente similar a Angiostoma limancis, Angiostoma kimmeriensis, Angiostoma spiridonovi, Angiostoma stammeri y Angiostoma carettae, porque todas ellas poseen 8 pares de papilas pedunculadas en la región caudal; sin embargo, se puede distinguir de éstas por el arreglo característico de dichas papilas: 1 par en posición precloacal y 7 pares postcloacales. Dos de las 12 especies congenéricas de Angiostoma fueron descritas de salamandras, Angiostoma plethodontis de Plethodon cinereus y Plethodon richmondi en Virginia, EUA y Angiostoma onychodactyla de Onychodactylus japonicus en Japón. Angiostoma lamotheargumedoi n. sp. se distingue fácilmente de estas 2 especies por la presencia de alas laterales y por el número de papilas precloacales.
Angiostoma lamotheargumedoi n. sp. (Nematoda: Angiostomatidae) from the intestine of Pseudoeurycea mixteca (Caudata: Plethodontidae) in central Mexico
Falcón-Ordaz, Jorge;Mendoza-Garfias, Berenit;Windfield-Pérez, Juan Carlos;Parra-Olea, Gabriela;Pérez-Ponce de León, Gerardo;
Revista mexicana de biodiversidad , 2008,
Abstract: a new species of angiostoma (angiostomatidae) is described from the intestine of the plethodontid salamander, pseudoeurycea mixteca from puebla state, in central mexico. the new species closely resembles angiostoma limancis, angiostoma kimmeriensis, angiostoma spiridonovi, angiostoma stammeri, and angiostoma carettae, because they all possess 8 pairs of pedunculate papillae in the caudal region; however, the new species can be distinguished by the unique arrangement of papillae, with 1 pre-cloacal pair, and 7 post-cloacal pairs. among the 12 congeneric species of angiostoma described so far, 2 have been described as parasites of salamanders, angiostoma plethodontis from plethodon cinereus and plethodon richmondi in virginia, usa, and angiostoma onychodactyla from onychodactylus japonicus in japan. angiostoma lamotheargumedoi n. sp. is readily distinguished from these 2 species by the presence of lateral alae and by the number of pre-cloacal papillae.
El museo, la museología y la fuente de información museística
Linarez Pérez,Juan Carlos;
ACIMED , 2008,
Abstract: the training of information professionals requires an integrative vision that assesses the meaning and importance museums have had and still have. the history of the museums has evolved just as the history of humanity; the origin of the term mouseion, dates back to the worship to the muses in the old greek regions of tracia and beocia. in america, as opposed to europe, the museums consolidated the nationalist and historic feelings. museology is the field of knowledge that confers formality and scientific rigorousness to the museum activity. starting from the dimensions of analysis proposed by van mensch (1995), the most significant elements of museum knowledge can be established; nevertheless, these dimensions cannot be seen as an abstract atomization of the knowledge in museology; they are, on the contrary, complementary verifiable elements. while the theoretical-empirical approach is of an especially heuristic character, that of the functional rationality aims to the design of behavior strategies, whereas the critic-philosophical approach seeks to develop a definitive point of view of paradigmatic connotations.
Juicios y cambios políticos: una visión epistémica
Pérez Toribio,Juan Carlos;
Argos , 2009,
Abstract: as a result of the profound political upheavals that have been and continue to be witnessed in some latin american countries over the last few years, we attempt to show the difficulties involved in describing social events in such circumstances, giving rise to what we might call a conflict of interpretations. in this sense, we explore the epistemological and epistemic possibilities that should be taken into account to allow us to consider certain judgments as true or otherwise. we also stress the importance of values and language in terms of what are finally considered as "facts" after weighing up both the rationality and reasonableness that judgments should be provided with.
El museo, la museología y la fuente de información museística Museums, museology and the sources of museum information
Juan Carlos Linarez Pérez
ACIMED , 2008,
Abstract: La formación de profesionales de la información requiere de una visión integradora que valore la significación e importancia que han tenido y aún conservan los museos. La historia de los museos ha transcurrido en forma paralela con la historia de la humanidad. El origen del término mouseion, se remonta al culto que se rendía a las musas en las antiguas regiones griegas de Tracia y Beocia. En América, a diferencia de Europa, los museos sirvieron para el afianzamiento de los sentimientos históricos y nacionalistas. La museología se erige como campo del conocimiento que confiere formalidad y rigurosidad científica a la actividad museística. Partiendo de las dimensiones de análisis que propone van Mensch (1995), pueden establecerse los elementos más significativos del conocimiento museológico; sin embargo, estas dimensiones no pueden verse como una atomización abstracta del conocimiento en la museología; son, por el contrario, elementos que se complementan, verificables. En tanto la aproximación teórico-empírica es de carácter eminentemente heurístico, la de la racionalidad funcional apunta hacia el dise o de estrategias de comportamiento y la crítico-filosófica busca el desarrollo de un punto de vista definitivo de connotaciones paradigmáticas. The training of information professionals requires an integrative vision that assesses the meaning and importance museums have had and still have. The history of the museums has evolved just as the history of humanity; the origin of the term mouseion, dates back to the worship to the muses in the old Greek regions of Tracia and Beocia. In America, as opposed to Europe, the museums consolidated the nationalist and historic feelings. Museology is the field of knowledge that confers formality and scientific rigorousness to the museum activity. Starting from the dimensions of analysis proposed by van Mensch (1995), the most significant elements of museum knowledge can be established; nevertheless, these dimensions cannot be seen as an abstract atomization of the knowledge in Museology; they are, on the contrary, complementary verifiable elements. While the theoretical-empirical approach is of an especially heuristic character, that of the functional rationality aims to the design of behavior strategies, whereas the critic-philosophical approach seeks to develop a definitive point of view of paradigmatic connotations.
Las Bases Moleculares del Cáncer Las Bases Moleculares del Cáncer
Juan Carlos Raya Pérez
Acta Universitaria , 2012,
Abstract: El estudio del cáncer a nivel molecular ha permitido el descubrimiento de gran cantidad de genes mutados relacionados con esta enfermedad. Estos genes son supresores de tumores u oncogenes, que tienen con ver la proliferación celular, la metástasis y/o la capacidad de las células para inducir la vascularización del tejido. La búsqueda de terapias ha llevado al descubrimiento de muchas moléculas capaces de inhibir el crecimiento de las células cancerosas, aunque la mejor opción sigue siendo la revisión periódica y la prevención. Al parecer, pese a los avances, los marcadores moleculares fallan en un alto porcentaje al tratar de diagnosticar un cáncer, así como al tratar de dar un pronóstico. Esto podría deberse al hecho de que se esta abordando el problema a nivel de célula. Cancer research has allowed us to discover many genes implied in development of this disease. These genes are suppressors or oncogenes that participate in cellular proliferation, methastasis and/or capacity of cell to induce vascularization of the tissue. Also, it has allowed the discovery of molecules able to inhibit the growth of cells cancerous. However, periodic checkups continues to be the best prevention against cancer. At molecular level is difficult to diagnose it, perhaps because is necessary to go to the tissue level. Molecular markers are not yet a reliable method in order to obtain a diagnosis or forecast cancer, maybe because one forgets the tissue level.
La Estructura de la Cromatina y la Regulación de la Transcripción La Estructura de la Cromatina y la Regulación de la Transcripción
Juan Carlos Raya Pérez
Acta Universitaria , 2012,
Abstract: Transcription in eucaryotes is aprocess investigated with great interest because is one of the crucial steps to understand how the DNA information is transformed in a complex organism. In this paper some of the most important steps in the genetic transcription control are revised giving some illustrative examples. La transcripción en eucariotas son eventos a los que se les investiga con gran interés, pues es uno de los pasos cruciales para tratar de entender cómo la información del DNA es transformada en un organismo complejo. Aquí se revisan algunos de los pasos más importantes del control de la transcripción genética, haciendo énfasis en la estructura de la cromatina. Se dan algunos ejemplos ilustrativos.
El Fototropismo en Plantas El Fototropismo en Plantas
Juan Carlos Raya Pérez
Acta Universitaria , 2012,
Abstract: El estudio del fototropismo ha llevado al aislamiento del gen que codifica para la fototropina. También se ha logrado el aislamiento de otros genes relacionados, como nph4, nph3 y rpt2. Es de esperarse que en los próximos a os se establezca la vía de se alización en que participan las fototropinas, vías poco dilucidadas hasta ahora. Studies on the molecular basis of phototropism have led to the isolation of the phototropin gene. Others genes involved in the phototropic response such as nph4, nph3 and rpt2 have also been isolated. It isexpected that in the near future it will be established what is the participation of the phototropins, unknown until know, by means of signalling.
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