Skyrmions, Hadrons and isospin chemical potential

Using the Hamiltonian formulation, in terms of collective variables, we explore the evolution of different skyrmionic parameters as function of the isospin chemical potential ($\mu$), such as the energy density, the charge density, the isoscalar radius and the isoscalar magnetic radius. We found that the radii start to grow very fast for $\mu \gtrsim 140$ MeV, suggesting the occurrence of a phase transition.Comment: 10 pages, 5 figure

Agronomic, economic and ecological aspects of the papaya (Carica papaya) production in Tabasco, Mexico

The cultivation of papaya is important in the tropic because it provides source of income to the farmer within a short time. Statistical data were obtained from farmers located in the Chontalpa, Rios and Centro-Sierra regions; the size of the survey was 67 farmers. The study shows the results of the farmers’ problem in a drastic reduction of their productivity because of the virosis and low prices in commercialization. The farmers were classified into three levels of technology, “low”, “middle” and “high”. The first one covers 88% of the farmers in seasonal conditions in contrast with the high technology that concentrates 4.5% in irrigation conditions. According to the technology used, the fertilizer shows more yields. Economically, the high technology had an internal tax return of 0.43 in comparison with the low technology of 0.25, which means that the investment is recovered with different yields. However, the use of high technology makes the system more competitive. Key words

Genética de las proteínas de reserva del cotiledón en castaño (Castanea sativa Miller)

A first approximation to the inheritance of cotyledon storage proteins was studied in European sweet chestnut (Castanea sativa Mill.) by evaluating the offspring of a controlled cross between two local chestnut varieties (Corriente and Pilonga) from southern Spain. The analysis was carried out in 15 polymorphic bands corresponding to the albumin fraction of the storage proteins. The relationship between bands displayed one case of allelism and four of linkage. These results should be considered as the baseline of the genetics of these proteins and suggest that they could be useful for the evaluation of the genetic variability in chestnut.Se ha efectuado una primera aproximación a la genética de las proteínas de reserva del cotiledón en castaño (Castanea sativa Mill.). Para ello, se ha evaluado la progenie resultante del cruzamiento controlado entre dos variedades locales del sur de España (Corriente y Pilonga). El análisis se ha realizado en 15 bandas polimórficas correspondientes a la fracción albúmina de las proteínas de reserva. El estudio de la combinación entre bandas ha permitido identificar un caso de alelismo y cuatro de ligamiento. Estos resultados suponen una contribución al estudio de la genética de estas proteínas y sugieren que podrían ser una herramienta útil para la evaluación de la variabilidad genética del castaño

The sTB-B Hierarchy

We construct a new supersymmetric two boson (sTB-B) hierarchy and study its properties. We derive the conserved quantities and the Hamiltonian structures (proving the Jacobi identity) for the system. We show how this system gives the sKdV-B equation and its Hamiltonian structures upon appropriate reduction. We also describe the zero curvature formulation of this hierarchy both in the superspace as well as in components.Comment: 15 pages, Te

A nonperturbative form of the spectral action principle in noncommutative geometry

Using the formalism of superconnections, we show the existence of a bosonic action functional for the standard K-cycle in noncommutative geometry, giving rise, through the spectral action principle, only to the Einstein gravity and Standard Model Yang-Mills-Higgs terms. It provides an effective nonminimal coupling in the bosonic sector of the Lagrangian.Comment: 12 pages. LaTeX2e, instructions for obsolete LaTeX'

On the Electric Charge of Monopoles at Finite Temperature

We calculate the electric charge at finite temperature $T$ for non-Abelian monopoles in spontaneously broken gauge theories with a CP violating $\theta$-term. A careful treatment of dyon's gauge degrees of freedom shows that Witten formula for the dyon charge at $T=0$, $Q = e(n - \theta/2\pi)$, remains valid at $T \ne 0$.Comment: 13 pages, latex file, no figure

Aislamiento de cepas queratinolíticas, con modificación del anzuelo Queratinoso

De muestras de suelo correspondiente a sectores ocupados por espacios libres -plazas, parques, baldíos- comprendidos en la zona urbana de la ciudad de Rosario (República Argentina), se aislan cepas de hongos queratinoliticos-fílicos, entre ellos dermatofitos geofílicos, utilizando como anzuelo queratinoso: pelos estériles de caballo y de niño, con y sin tratamiento alcalino. La alcalinización del anzuelo queratinoso, determinó que éste fuera utilizado por un mayor número de colonias con capacidad queratinolítica, no relacionadas a los dermatofitos.La ausencia de grupos SH- libres en el desarrollo in vitro, de Microsporum gypseum y Keratinomyces ajelloi sobre las queratinas hidrolizadas, nos hizo pensar que la degradación de las mismas, se realiza en forma distinta a la estudiada empleando queratinas nativas, o sin hidrolizar, las cuales forman radicales tioles, como catabolitos.Esta variante metabólica, necesaria para la queratinolisis, pudo ser aprovechada por otras cepas que se muestran competitivas con un substrato en esas condiciones

TEACHING STRATEGIES IN THE MSc PROGRAME IN CLIMATE CHANGE AND RESTORATION ON DEGRADED LAND

UPM is a leader on landslide assessment and environmental restoration, as well as in waste management. The study of climate change and degraded land requires innovative techniques in teaching that will be analyzed and discussed in the following paper

PREPARATION AND MANAGEMENT OF THE MSc PROGRAME IN ENVIRONMENTAL SECURITY

Authors proposed an MSc Program related to Environmental Security and Management. This program endeavors to prepare students for the regional and global postgraduate job market