La ciencia andaluza a golpe de ratón

El Sistema de Información Científica de Andalucía (SICA) es una ventana al conocimiento que se produce en nuestra comunidad autónoma. En 2010 ha comenzado el diseño de SICA2 que situará a esta plataforma en la vanguardia de la sistematización y la difusión de la investigació

Cooper pair dispersion relation in two dimensions

The Cooper pair binding energy {\it vs.} center-of-mass-momentum dispersion relation for Bose-Einstein condensation studies of superconductivity is found in two dimensions for a renormalized attractive delta interaction. It crosses over smoothly from a linear to a quadratic form as coupling varies from weak to strong.Comment: 2 pages, 1 figure, new version published in Physica

Monte Carlo Calculations for Liquid 4^4He at Negative Pressure

A Quadratic Diffusion Monte Carlo method has been used to obtain the equation of state of liquid $^4$He including the negative pressure region down to the spinodal point. The atomic interaction used is a renewed version (HFD-B(HE)) of the Aziz potential, which reproduces quite accurately the features of the experimental equation of state. The spinodal pressure has been calculated and the behavior of the sound velociy around the spinodal density has been analyzed.Comment: 10 pages, RevTex 3.0, with 4 PostScript figures include

One-dimensional Cooper pairing

We study electron pairing in a one-dimensional (1D) fermion gas at zero temperature under zero- and finite-range, attractive, two-body interactions. The binding energy of Cooper pairs (CPs) with zero total or center-of-mass momentum (CMM) increases with attraction strength and decreases with interaction range for fixed strength. The excitation energy of 1D CPs with nonzero CMM display novel, unique properties. It satisfies a dispersion relation with \textit{two} branches: a\ phonon-like \textit{linear }excitation for small CP CMM; this is followed by roton-like \textit{quadratic} excitation minimum for CMM greater than twice the Fermi wavenumber, but only above a minimum threshold attraction strength. The expected quadratic-in-CMM dispersion \textit{in vacuo }when the Fermi wavenumber is set to zero is recovered for \textit{any% } coupling. This paper completes a three-part exploration initiated in 2D and continued in 3D.Comment: 12 pages, 6 figure

The BCS-Bose Crossover Theory

We contrast {\it four} distinct versions of the BCS-Bose statistical crossover theory according to the form assumed for the electron-number equation that accompanies the BCS gap equation. The four versions correspond to explicitly accounting for two-hole-(2h) as well as two-electron-(2e) Cooper pairs (CPs), or both in equal proportions, or only either kind. This follows from a recent generalization of the Bose-Einstein condensation (GBEC) statistical theory that includes not boson-boson interactions but rather 2e- and also (without loss of generality) 2h-CPs interacting with unpaired electrons and holes in a single-band model that is easily converted into a two-band model. The GBEC theory is essentially an extension of the Friedberg-T.D. Lee 1989 BEC theory of superconductors that excludes 2h-CPs. It can thus recover, when the numbers of 2h- and 2e-CPs in both BE-condensed and noncondensed states are separately equal, the BCS gap equation for all temperatures and couplings as well as the zero-temperature BCS (rigorous-upper-bound) condensation energy for all couplings. But ignoring either 2h- {\it or} 2e-CPs it can do neither. In particular, only {\it half} the BCS condensation energy is obtained in the two crossover versions ignoring either kind of CPs. We show how critical temperatures $T_{c}$ from the original BCS-Bose crossover theory in 2D require unphysically large couplings for the Cooper/BCS model interaction to differ significantly from the $T_{c}$s of ordinary BCS theory (where the number equation is substituted by the assumption that the chemical potential equals the Fermi energy).Comment: thirteen pages including two figures. Physica C (in press, 2007

Antimicrobial Activity and Brine Shrimp Lethality Bioassay of the Leaves Extract of Dillenia indica Linn

The crude methanolic extract of Dillenia indica Linn. (Dilleniaceae) leaves has been investigated for the evaluation of antimicrobial and cytotoxic activities. Organic solvent (n-hexane, carbon tetrachloride and chloroform) fractions of methanolic extract and methanolic fraction (aqueous) were screened for their antimicrobial activity by disc diffusion method. Besides, the fractions were screened for cytotoxic activity using brine shrimp (Artemia salina) lethality bioassay. Among the four fractions tested, n-hexane, carbon tetrachloride, and chloroform fractions showed moderate antibacterial and antifungal activity compared to standard antibiotic, kanamycin. The average zone of inhibition was ranged from 6 to 8 mm at a concentration of 400 µg/disc. But the aqueous fraction was found to be insensitive to microbial growth. Compared to vincristine sulfate (with LC50 of 0.52 µg/ ml), n-hexane and chloroform fractions demonstrated a significant cytotoxic activity (having LC50 of 1.94 µg/ml and 2.13 µg/ml, respectively). The LC50 values of the carbon tetrachloride and aqueous fraction were 4.46 µg/ml and 5.13 µg/ ml, respectively. The study confirms the moderate antimicrobial and potent cytotoxic activities of Dillenia indica leaves extract and therefore demands the isolation of active principles and thorough bioassay

Implementation of Classroom of Pharmacy at the Faculty of Health Sciences

El Espacio Europeo de Educación Superior (EEES) supone un cambio en nuestras metodologías docentes, que deben orientarse hacia una mayor participación del alumno en el proceso de enseñanzaaprendizaje, así como a satisfacer la necesidad de formación del mundo laboral. Por ello, y en base a la necesidad de nuestra Universidad de adaptar la docencia de Farmacia al Espacio Europeo de Educación Superior, la Facultad de Ciencias de la Salud de la Universidad CEU Cardenal Herrera, ha desarrollado un proyecto para implantar un aula que simule una Oficina de Farmacia. Entre los perfiles laborales del farmacéutico, el de Oficina de Farmacia es el más frecuente, por ser esta la ocupación laboral mayoritaria. La labor en las farmacias comunitarias consiste básicamente en la conservación, dispensación, asesoramiento y elaboración de medicamentos. Todo ello, unido al ejercicio de la atención farmacéutica, conlleva una gran carga de responsabilidad, un conocimiento y vigilancia de la legislación establecida al respecto y una base científica y técnica importante. La farmacia es, a su vez, un centro de educación y prevención sanitaria, dietética y cosmética. Con el objetivo de que nuestros alumnos desarrollen todas las competencias necesarias para el farmacéutico en la Facultad de Salud se implantó el Aula de la Farmacia.The European Higher Education Area (EHEA) represents a shift in our teaching methodology, which should now be steered towards a greater participation of students in the teaching-learning process and should satisfy the employment market’s need for trained professionals. In this context, our university has sought to adapt its pharmacy teaching programme to the EHEA, and so the Faculty of Health Sciences of the CEU Cardenal Herrera University has developed a project to create a space that simulates a working pharmacy. Among the different professional profiles within the discipline of pharmacy, a position in a chemist’s/drugstore is the most common, as the majority of pharmacists are employed as such. The work of community pharmacies basically consists of the storing, dispensing and preparation of medication. These tasks, combined with the pharmaceutical care provided to patients and customers, involve a great deal of responsibility that depends on knowledge and safeguarding of the current legislation and a solid scientific and technical training. A pharmacy is, at the same time, a centre of education and prevention in health, diet and cosmetics. With all of this in mind, the Pharmacy Room was created by the Health Sciences Faculty with the objective of allowing our students to develop all the skills expected of a pharmacist