On the large scale behavior of super-Brownian motion in three dimensions with a single point source

In a recent work, Fleischmann and Mueller (2004) showed the existence of a super-Brownian motion in R^d, d=2,3, with extra birth at the origin. Their construction made use of an analytical approach based on the fundamental solution of the heat equation with a one point potential worked out by Albeverio et al. (1995). The present note addresses two properties of this measure-valued process in the three-dimensional case, namely the scaling of the process and the large scale behavior of its mean

Ocean und Mittelmeer : Reisebriefe, Bd. 1-2

Eben wollte mein gewöhnlicher Secretär sich hinsetzen und Ihnen schreiben, als sich denn doch ein schwaches Schamgefühl meiner bemeisterte, und mir den heroischen Entschluß beibrachte, eigenhändig das kleine Geschäft zu vollbringen. ..

Making social studies in standards-based curricula

Purpose: The aim of this article is to critically explore the complex relations among the triad comprising standards-based curriculum, the curriculum concept of ‘competences’ and the subject of civics in Swedish curricula. Design/methodology/approach: The theoretical framework is based on Bernstein’s (2000) two models of pedagogy, the competence model and the performance model. Following Deng and Luke (2008), we analyse the conceptions of ‘knowledge’ in the subject of civics and explore how a civics syllabus in a standards-based curriculum can be understood and expanded in relation to a classical typology of social studies by Barth and Shermis (1970). Finding: The syllabi of civics includes a clear orientation towards social efficiency. Moreover, the abilities, the concept used instead of competences, are strongly linked to the subject matter. Civics is thus understood as a mélange of abilities and in-built subject-specific content. We identify a new category in the typology of social studies, which is social studies as performance-based generic competences

Trachemys adiutrix

Number of Pages: 4Integrative BiologyGeological Science

Alimentación de Podocnemis Sextuberculata (Testudines: Podocnemididae) en la Reserva Mamirauá, Amazonas, Brasil

Feeding is one of the most important aspects in the life of animals. There has been very little published regarding the feeding of Podocnemis sextuberculata. This study presents results from research conducted in the Mamirauá Sustainable Development Reserve-RDSM regarding the food consumed by this species. There were analyzed 235 samples of stomach contents 117 males and 118 females. The stomach contents were obtained by stomach flushing with water or from dissections of digestive tracts. Plant material was the most prominent food item found in the stomachs of P. sextuberculata. There was no difference in the frequency of occurrence of seeds between the high and low water seasons. The total volume of the seeds consumed was high in all habitats. This species is adapted to areas with great seasonal changes, the flooded forest habitat is appropriate for this species because of the abundance of plants in the family Poaceae. The information obtained highlights the relevance of protecting vegetal species and habitat of P. sextuberculata in RDSM.La alimentación es uno de los aspectos más importantes en la vida de los organismos. En el grupo de los quelonios acuáticos amazónicos del género Podocnemis este aspecto es descuidado para P. sextuberculata. En este trabajo se presentan los resultados de una investigación sobre la alimentación de esta especie en la Reserva de Desarrollo Sustentable Mamirauá-RDSM. Se analizaron 235 muestras de contenidos estomacales, 117 machos y 118 hembras. Para obtener muestras de contenido estomacal, se utilizó el método de lavado con agua. Los contenidos estomacales también fueron colectados por disecación de tracto digestivo. Materia vegetal fue el ítem predominante en la alimentación de P. sextuberculata. No hubo diferencia en la frecuencia de semillas en las temporadas de aguas bajas y altas de los ríos. En todos los hábitat el volumen total de las semillas fue muy alto. La especie está adaptada a los cambios de estación, siendo las áreas inundables el hábitat más apropiado, en relación a la abundancia de las especies de la familia Poaceae. La información obtenida destaca la importancia de proteger las especies vegetales y los hábitat usados por P. sextuberculata en la RDSM