Immunoelectron microscopic localization of transforming growth factor alpha in rat colon

Transforming growth factor alpha (TGF alpha) is a polypeptide, which binds to the epidermal growth factor receptor to carry out its function related to cell proliferation and differentiation. The ultrastructural localisation of TGF alpha was studied in both the proximal and the distal colon. The columnar cells, lining the surface epithelium of the proximal colon, showed a strong immunoreactivity in the polyribosomes and in the interdigitations of the lateral membrane. The columnar cells of the crypts and the goblet cells in both the proximal and the distal colon showed the immunostaining in the cis and trans cisternae of the Golgi apparatus. TGF alpha seems to be processed differently in the surface columnar cells and in the crypt columnar cells and goblet cells. Moreover, it probably has different roles in proliferation and differentiation.

Immunoelectron microscopic localization of transforming growth factor alpha in rat colon

Transforming growth factor alpha (TGF alpha) is a polypeptide, which binds to the epidermal growth factor receptor to carry out its function related to cell proliferation and differentiation. The ultrastructural localisation of TGF alpha was studied in both the proximal and the distal colon. The columnar cells, lining the surface epithelium of the proximal colon, showed a strong immunoreactivity in the polyribosomes and in the interdigitations of the lateral membrane. The columnar cells of the crypts and the goblet cells in both the proximal and the distal colon showed the immunostaining in the cis and trans cisternae of the Golgi apparatus. TGF alpha seems to be processed differently in the surface columnar cells and in the crypt columnar cells and goblet cells. Moreover, it probably has different roles in proliferation and differentiation.

José Ramón Mélida. Arqueología Española. Edición de Margarita Díaz Andreu

Dentro de la serie de Urgoiti Editores sobre los grandes nombres de la ciencia histórica en España, se publica la tercera obra dedicada a los arqueólogos y prehistoriadores de la primera mitad del siglo XX. Tras los estudios de Jordi Cortadella sobre Pere Bosch Gimpera (1981-1974) y Fernando Wulff sobre Adolf Schulten (1870-1960), y a la espera del trabajo de Gloria Mora sobre Hugo Obermaier (1877-1946), ve la luz el estudio que Margarita Díaz Andreu ha dedicado a una de las figuras más nombradas, pero a la par más desconocidas, de la arqueología española: José Ramón Mélida y Alinari (1856-1933).

Díaz-Andreu, Margarita: A world history of nineteenth century archaeology. Nationalism, Colonialism, and the Past.

M. Díaz-Andreu plantea un análisis de las implicaciones académicas, sociales y políticas de la arqueología (entendiendo como tal la investigación estricta, pero también el coleccionismo de obras de arte) entre finales del siglo XVIII y el inicio de la Primera Guerra Mundial, período durante el cual la formación y expansión de los imperios coloniales constituyó uno de los elementos clave en el discurso ideológico de los estados europeos. Su trabajo continúa la línea marcada por estudios suyos anteriores, esencialmente Nationalism and Archaeology in Europe (Díaz-Andreu & T. Champion [eds.], 1996) y Excavating Women. A History in European Archaeology (Díaz-Andreu & M. L. S. Sorensen, 1998), en los que combinaba el análisis historiográfico de diferentes aspectos y personajes clave de la arqueología europea desde la perspectiva de la organización de las redes sociales entre investigadores, con la reflexión sobre las implicaciones de la arqueología como ciencia en la definición y defensa de diferentes credos políticos, y el papel de la mujer en la investigación.

Què provoca la sobrequalificació universitària a Espanya?

En l’estudi que es presenta a continuació pretenem trobar resposta a una qüestió realment complexa, què causa la sobrequalificació universitària a Espanya, especialment durant la última dècada. Entenem per sobrequalificació aquelles persones que tenen una formació superior a la necessària per la feina que duen a terme en el seu lloc de treball.Ens basarem en l’existència d’un desajust entre l’oferta (sistema educatiu) i la demanda de treballadors qualificats, principal causa de la sobrequalificació. D’aquesta manera, estructurarem el treball en dos grans blocs, analitzant l’oferta i la demanda de forma independent. Més concretament, descriurem la situació actual i els factors que originen aquest fenomen.Tot això permetrà al lector entendre què provoca aquesta sobrequalificació amb més detall.

Historia de Vida de Andrés Díaz de Rábago S.J. (1947-1957): O cómo la Guerra Civil China cambió la estructura de la Compañía de Jesús en Asia.

Peer-reviewed

Entrevista a D. Ricard Ruiz Garzón, Periodista y Escritor

Entrevista al periodista i escriptor D. Ricard Ruiz Garzón

Caracterização morfológica da semente e da plântula de bacurizinho (Rheedia acuminata (Ruiz et Pav.) Plachon et Triana - Clusiaceae)

O bacurizinho é uma espécie frutífera do gênero Rheedia, nativa da Amazônia, e raramente cultivada, pois seus frutos, embora comestíveis, apresentam polpa escassa. Os estudos com o bacurizinho visam a sua utilização como porta-enxerto, redutor de porte para outras espécies do gênero Rheedia e Garcinia que apresentam altura elevada, como o bacuripari (Rheedia macrophylla Planchon et Triana- Clusiaceae) e o mangostão (Garcinia mangostana L.). Este trabalho teve como objetivo caracterizar, morfologicamente, a semente e a plântula dessa espécie. A semente é exalbuminosa, bitegumentada, com a testa de coloração marrom, apresentando vários feixes vasculares bem visíveis, distinguindo-se por sua coloração um pouco mais clara. O hilo é arredondado, de coloração escura, com pequena região mais clara ao centro, correspondendo no ponto de entrada de feixe vascular. A micrópila situa-se próxima ao hilo, sobre uma pequena protuberância triangular. O embrião é anômalo, hipocotilar e é representado unicamente por um longo eixo hipocótilo-radícula, sendo os cotilédones diminutos, aparecendo apenas na extremidade superior no lado oposto da micrópila. Durante a germinação, ocorre primeiramente a emergência de delgada raiz primária, no pólo oposto onde será originado o epicótilo. Essa raiz cresce aproximadamente 5-7cm e cessa, fenecendo posteriormente. Por ocasião da emergência do epicótilo, ocorre ao mesmo tempo a formação de uma raiz adventícia, na base do epicótilo, bem mais robusta que a anterior e que se constituirá no sistema radicular da planta. Precedendo a abertura do primeiro par de metáfilos, desenvolvem-se no epicótilo três pares de catafilos opostos e de coloração esverdeada. A germinação é hipógea e a plântula do tipo criptocotiledonar.

Elección de especies en las repoblaciones forestales. Contribuciones del profesor Ruiz de la Torre

La repoblación forestal es una de las alternativas técnicas más importantes en la restauración ecológica. La selección correcta de las especies es una de las decisiones más importantes del proyecto, por las implicaciones significativas que a largo plazo tiene en los costes de gestión y en el valor de la comunidad final. Se analizan los factores y las etapas del proceso de selección así como los conceptos teóricos que han servido de base a los modelos de restauración forestal. En este artículo presentamos algunas de las contribuciones que el Profesor Ruiz de la Torre ha realizado en relación al conocimiento de las características ecológicas y selvícolas de las principales especies arbóreas españolas, así como de los mecanismos de sucesión de la vegetación.

El medievalismo fértil de Paloma Díaz-Mas

The author of this article is concerned with trying to understand why Paloma Díaz-Mas, the writer of such an excellent novel as La tierra fértil (1999), has not received much critical attention. He underlines three main reasons. First, she does not live in Madrid or Barcelona and so she is far away from the main centres of cultural power. Second, she teaches Spanish literature in the Basque Country, a political and linguistic community which significantly differs from that of many other writers. Third, she writes historical novels, which does not appear to be very fashionable in Spain these days. Moreover, Díaz-Mas is a woman writer who does not make use of the most commonly available feminine patterns, and she does not seem to offer a model easy to include in a given feminist methodology either. However, Mérida-Jiménez argues that Paloma provides an intelligent deconstruction of “male authority” through subtle rhetorical means, as well as a representation of the weakness of his “domination” in very innovative ways, such as those derived from the dialectics between history and fiction, centrality and marginality, heterosexuality and homosexuality, individual and society, dream and reason or tradition and modernity.

Short communication.Wood identification based on their common name and their transversal surface anatomy. Application to the batch from the expedition of Ruiz and Pavon

Aim of study: To identify species of wood samples based on common names and anatomical analyses of their transversal surfaces (without microscopic preparations). Area of study: Spain and South America Material and methods: The test was carried out on a batch of 15 lumber samples deposited in the Royal Botanical Garden in Madrid, from the expedition by Ruiz and Pavon (1777-1811). The first stage of the methodology is to search and to make a critical analysis of the databases which list common nomenclature along with scientific nomenclature. A geographic filter was then applied to the information resulting from the samples with a more restricted distribution. Finally an anatomical verification was carried out with a pocket microscope with a magnification of x40, equipped with a 50 micrometers resolution scale. Main results: The identification of the wood based exclusively on the common name is not useful due to the high number of alternative possibilities (14 for “naranjo”, 10 for “ébano”, etc.). The common name of one of the samples (“huachapelí mulato”) enabled the geographic origin of the samples to be accurately located to the shipyard area in Guayaquil (Ecuador). Given that Ruiz y Pavon did not travel to Ecuador, the specimens must have been obtained by Tafalla. It was possible to determine correctly 67% of the lumber samples from the batch. In 17% of the cases the methodology did not provide a reliable identification. Research highlights: It was possible to determine correctly 67% of the lumber samples from the batch and their geographic provenance. The identification of the wood based exclusively on the common name is not useful.