La erosión en campos cultivados en Galicia (NW España)

[Resumen] En la presente comunicación se realiza un seguimiento de la erosión en parcelas cultivadas en Galicia. Para ello, en la estación experimental El Pedroso se construyeron dos parcelas, de diferente pendiente, y se sometieron a un proceso de laboreo según las formas tradicionales de cultivar. En la presente comunicación se exponen los resultados del seguimiento de la experimentación desde abril a diciembre de 1995, en donde se observa que la pendiente desempeña una función distinta de la que en un principio podría pensarse, dado que la escorrentía y carga varían de forma inversa a la pendiente.[Abstract] A very closed study of erosion is made in this paper about plough plots in Galicia. For this, in the experimental station El Pedroso were built two plots, with different slope, and were ploughed in a traditional way. In this paper we resume the results of the experiment from april to december 1995, where it is seen that slope has a different function that was thought at the beginning of the experiment, because discharge and load don't vary directly with slope

Point defects on graphene on metals

Understanding the coupling of graphene with its local environment is critical to be able to integrate it in tomorrow's electronic devices. Here we show how the presence of a metallic substrate affects the properties of an atomically tailored graphene layer. We have deliberately introduced single carbon vacancies on a graphene monolayer grown on a Pt(111) surface and investigated its impact in the electronic, structural and magnetic properties of the graphene layer. Our low temperature scanning tunneling microscopy studies, complemented by density functional theory, show the existence of a broad electronic resonance above the Fermi energy associated with the vacancies. Vacancy sites become reactive leading to an increase of the coupling between the graphene layer and the metal substrate at these points; this gives rise to a rapid decay of the localized state and the quenching of the magnetic moment associated with carbon vacancies in free-standing graphene layers

Haemophilus parasuis

The expression of chemokines (CCL-2 and CXCL-8) and cytokines (IL-1α, IL-1β, IL-6, TNF-α, and IL-10) was evaluated by RT-qPCR in colostrum-deprived pigs vaccinated and challenged with Haemophilus parasuis serovar 5. Two vaccines containing native proteins with affinity to porcine transferrin (NPAPTim and NPAPTit) were tested, along with two control groups: one inoculated with PBS instead of antigen (challenge group (CHG)), and another one nonimmunized and noninfected (blank group). The use of NPAPTim and NPAPTit resulted in complete protection against H. parasuis (no clinical signs and/or lesions), and both vaccines were capable of avoiding the expression of the proinflammatory molecules to levels similar to physiological values in blank group. However, overexpression of all proinflammatory molecules was observed in CHG group, mainly in the target infection tissues (brain, lungs, and spleen). High expression of CCL-2, CXCL-8, IL-1α, IL-1β, and IL-6 can be considered one of the characteristics of H. parasuis infection by serovar 5

Cooperative Learning in the Implementation of Teaching Chemistry (Didactic Instrumentation) in Engineering in México

AbstractIn engineering you think of chemistry as a difficult and boring subject. Some professors who are teaching it, have seen apathy and lack of interest in the students. This paper presents some findings of an investigation done which allowed to listen to the voice of 250 Mexican students regarding the usefulness of cooperative learning in chemistry. An exploratory-descriptive methodology was applied, together with a pretest and a post-test. By implementing the Cooperative Learning, the importance of the positive interdependence for critical thinking was appraised and a move away was detected from the theoretical content and meaning of the everyday context of the students

El cerdo Pelón Mexicano: programa de conservación genética de una raza en peligro

Here is described the programme of genetic conservation of the Mexican Hair-less pig under development in the Yukatan State (Mexico). It consists of several actions on the characterization of the population and its management system, the in situ and ex situ conservation, and the coordination. The results obtained by the moment are summarized.Aquí se describe el programa de conservación genética del cerdo Pelón Mexicano en desarrollo en el Estado de Yukatan (México). Consiste en varias acciones sobre la caracterización de la población y de sus sistemas de explotación, la conservación in situ y ex situ y la coordinación. Se resumen los resultados obtenidos hasta el momento

Some advances on the Erlang(n) dual risk model

The dual risk model assumes that the surplus of a company decreases at a constant rate over time and grows by means of upward jumps, which occur at random times and sizes. It has applications to companies with economical activities involved in research and development. This model is dual to the well known Cram´er-Lundberg risk model with applications to insurance. Existing results on the study of the dual model assume that the random waiting times between consecutive gains follow an exponential distribution, as in the classical Cram´er–Lunderg risk model. We generalize to other compound renewal risk models where such waiting times are Erlang(n) distributed. Using the roots of the fundamental and the generalized Lundberg’s equation, we get expressions for the ruin probability and the Laplace transform of the time of ruin for an arbitrary single gain distribution. Furthermore, we compute expected discounted dividends, as well as higher moments, when the individual common gains follow a Phase–Type, PH(m), distribution. Finally, we perform illustrations working some examples for some particular gain distributions and obtain numerical resultsinfo:eu-repo/semantics/publishedVersio