3,737 research outputs found
System dynamics modelling in systems biology and applications in pharmacology
El modelado matemático de sistemas biológicos complejos es uno de los temas clave en la Biología de Sistemas y varios métodos computacionales basados en la simulación computarizada han sido aplicados hasta ahora para determinar el comportamiento de los sistemas no lineales. La Dinamica de Sistemas es una metodología de modelado intuitivo basada en el razonamiento cualitativo por el cual un modelo conceptual se puede describir como un conjunto de relaciones de causa y efecto entre las variables de un sistema. A partir de esta estructura, es posible obtener un conjunto de ecuaciones dinámicas que describan cuantitativamente el comportamiento del sistema. Centrándose en los sistemas farmacológicos, el modelado compartimental a menudo se utiliza para resolver un amplio espectro de problemas relacionados con la distribución de materiales en los sistemas vivos en la investigación, el diagnóstico y la terapia en todo el cuerpo, los órganos y los niveles celulares.
En este artículo presentamos la metodología de modelado de Dinámica del Sistema y su aplicación al modelado de un modelo compartimental farmacocinético-farmacodinámico del efecto de profundidad anestésica en pacientes sometidos a intervenciones quirúrgicas, derivando un modelo de simulación en el entorno de simulación orientada a objetos OpenModelica. La Dinamica de Sistemas se puede ver como una herramienta educativa poderosa y fácil de usar y en la enseñanza de Biología de Sistemas.Universidad de Málaga. Campus de Excelencia Internacional Andalucía Tech
Incentivos fiscales para fomentar la realización de actividades de investigación y desarrollo e innovación tecnológica: la deducción en la cuota prevista en la Ley 43/1995, de 27 de diciembre, del Impuesto sobre Sociedades
PT-symmetry broken by point-group symmetry
We discuss a PT-symmetric Hamiltonian with complex eigenvalues. It is based
on the dimensionless Schr\"{o}dinger equation for a particle in a square box
with the PT-symmetric potential . Perturbation theory clearly
shows that some of the eigenvalues are complex for sufficiently small values of
. Point-group symmetry proves useful to guess if some of the eigenvalues
may already be complex for all values of the coupling constant. We confirm
those conclusions by means of an accurate numerical calculation based on the
diagonalization method. On the other hand, the Schr\"odinger equation with the
potential exhibits real eigenvalues for sufficiently small
values of . Point group symmetry suggests that PT-symmetry may be broken
in the former case and unbroken in the latter one
Feeling the music: Deaf people breaking the sound barrier
Este trabajo es parte de la Tesis Doctoral “Sentir la Música. Caminos de Realización Musical en Personas
Sordas desde la perspectiva de la Justicia Social” que se realiza en el Grupo de Investigación Gice (Cambio
Educativo para la Justicia Social) de la Facultad de Formación del Profesorado y Educación de la
Universidad Autónoma de MadridEn esta investigación en marcha, partimos de un marco teórico en el que se plantea la
Educación Musical como herramienta para el avance en Justicia Social. Desde el enfoque
de Justicia Social en tres dimensiones que proponen Murillo y Hernández-Castilla (2011);
Redistribución, Reconocimiento y Participación, se estructura una propuesta que desafía a
los cánones tradicionales, apoyándose en las líneas pedagógicas más importantes de la
Educación Musical del siglo XX y las más novedosas tanto de Música para la Justicia
Social como de Música y Personas Sordas. Este estudio de enfoque cualitativo cuenta con
la importante participación de personas sordas que nos están proporcionando una
información clave para comprender cómo sienten la música, cómo son capaces de disfrutar
aprendiendo y haciendo música y qué factores dificultan o impiden ese desarrollo musical.
Se ha realizado una entrevista a cuatro personas sordas de diferente perfil sociodemográfico
y en una segunda fase se ha aplicado un programa de formación musical a un
grupo de personas sordas elaborado en base a la información aportada por el marco teórico
y las entrevistas. Estos hallazgos nos aportan importantes datos para diseñar un programa
de formación musical para personas sordas de acuerdo las características específicas de este
colectivoIn this ongoing research, we start from a theoretical framework in which Musical
Education is proposed as a tool for advancement in Social Justice. From the Social Justice
approach in three dimensions proposed by Murillo and Hernández-Castilla (2011);
Redistribution, Recognition and Participation, a proposal that defies the traditional
canons, is based on the most important pedagogical lines of Music Education of the 20th
century and the most innovative of Music for Social Justice as well as Music and Deaf
People. This qualitative study has the important participation of deaf people who are
providing us with key information to understand how they feel about music, how they are
able to enjoy learning and making music and what factors make it difficult or impossible
for them to develop. An interview was conducted with four deaf people of different sociodemographic
profile and in a second phase a musical training program was applied to a
group of deaf people based on the information provided by the theoretical framework and
interviews. These findings provide us with important data for designing a musical
training program for deaf people according to the specific characteristics of this grou
Efficient solution of optimal multimarket electricity bid models
Short-term electricity market is made up of a
sequence of markets, that is, it is a multimarket enviroment. In
the case of the Iberian Energy Market the sequence of major
short-term electricity markets are the day-ahead market, the
ancillary service market or secondary reserve market (henceforth
reserve market), and a set of six intraday markets. Generation
Companies (GenCos) that participate in the electricity market
could increase their benefits by jointly optimizing their participation
in this sequence of electricity markets. This work
proposes a stochastic programming model that gives the GenCo
the optimal bidding strategy for the day-ahead market (DAM),
which considers the benefits and costs of participating in the
subsequent markets and which includes both physical futures
contracts and bilateral contracts.Peer ReviewedPostprint (published version
Mantos inducidos por microbialitas en sedimentos siliciclásticos plio-cuaternarios? del NO de Iberia
Microbial mats are organo-sedimentary deposits formed by
bacteria that trap or synthesize certain chemical elements. This type
of activity gives rise to the formation of lamellar and/or columnar
bioconstructions (stromatolites) and/or concentric structures (oncolites
and thrombolites). The study of microbial mats used to be
restricted mainly to marine and coastal environments related to the
formation of ancient carbonate sediments (Palaeozoic/Proterozoic),
and/or extreme conditions in hypersaline environments. However,
in recent years, the presence of these forms has been identified in
continental siliciclastic rocks and sediments with a temporal distribution
that reaches into modern times. In this study, several levels
of ferruginous crusts associated with microbial activity are found,
interspersed in a Cenozoic deposit located in the province of Zamora.
This deposit consists of concentric, laminated iron structures
filled with silt, interspersed throughout a clayey-silt layer of variegated
colors which shows signs of bioturbation and desiccation due to
fluid escape. These findings allow the inference of the sedimentary
and climatic conditions responsible for the growth and preservation
of microbial mats in the siliciclastic sediments of the north-western
edge of the Duero BasinLos mantos microbiales constituyen depósitos organosedimentarios
formados por bacterias que atrapan o sintetizan determinados
elementos químicos. Este tipo de actividad da lugar a la formación de
estructuras laminares y/o columnares (estromatolitos) y/o concéntricas
(oncolitos y trombolitos). Su estudio, por tanto, quedaba reducido principalmente
a ambientes marinos y litorales relacionados con la formación
de sedimentos carbonatados de edad muy antigua (Paleozoico/
Proterozoico), y/o condiciones extremas en ambientes hipersalinos. Sin
embargo, en los últimos años, se ha identificado la presencia de estas
formas en rocas y sedimentos de afinidad continental y carácter siliciclástico,
que se extienden temporalmente hasta la actualidad. En este
estudio, se presenta el hallazgo de varios niveles de costras ferruginosas
asociadas a la actividad microbiana, intercalados en un depósito
cenozoico de la provincia de Zamora. Se trata de una serie de niveles
caracterizados por la presencia de capas ferruginosas laminadas y concéntricas,
constituidas por limos que aparecen en el techo y muro de
un nivel arcilloso-limoso de colores abigarrados y signos de bioturbación
y desecación por escape de fluidos. Este singular hallazgo permite
establecer las condiciones sedimentarias y climáticas responsables del
crecimiento y conservación de mantos microbianos en sedimentos siliciclásticos
del borde noroccidental de la cuenca del Duer
Electrochemical study on an activated carbon cloth modified by cyclic voltammetry with polypyrrole/anthraquinone sulfonate and reduced graphene oxide as electrode for energy storage
[EN] This work describes a two-step procedure for the electrochemical coating of reduced graphene oxide (RGO) and polypyrrole anthraquinone sulfonate (PPyAQS) onto an activated carbon cloth (ACC) by cyclic voltammetry (CV). The textile samples were characterized by CV, electrochemical impedance spectroscopy (EIS) and galvanostatic charge-discharge measurements using a sandwich-type (electrode/separator/electrode) cell designed to operate in three or two-electrode configurations. The presence of RGO onto the ACC surface optimized the electrosynthesis of PPyAQS and reinforced the stability of the polymer with the number of charge/discharge cycles. A retention capacity of 90% after 100 charge-discharge cycles together with an energy density of 7.8¿×¿10¿4¿W¿h¿cm¿2 at a power density of 1.8¿×¿10¿3¿W¿cm¿2 were obtained for the ACC/RGO/PPyAQS sample. The analyses by field emission scanning electron microscopy (FESEM) showed the RGO veils-like and PPyAQS glomerular structures covering the ACC-fibers. The Fourier transform infrared spectroscopy (FTIR) analyses not only detected the presence of PPy and AQS, but also, the changes in the molecular structure of PPyAQS, depending on its oxidation state, as consequence of the redox reactions occurred in the charge/discharge processes in the two-electrode cell.The authors wish to acknowledge to Chemviron Carbon who kindly
donated the ZORFLEX® activated carbon fabric. The authors wish to
thank the Spanish Agencia Estatal de Investigación de Economía (AEI)
and European Union (FEDER funds) for the financial support (contract
MAT2016-77742-C2-1-P). Tim Vickers is gratefully acknowledged for
help with the English revision. Electron Microscopy Service of the UPV
(Universitat Politècnica de València) is gratefully acknowledged for
help with FESEM characterization.Fernández Sáez, J.; Bonastre Cano, JA.; Molina Puerto, J.; Cases, F. (2018). Electrochemical study on an activated carbon cloth modified by cyclic voltammetry with polypyrrole/anthraquinone sulfonate and reduced graphene oxide as electrode for energy storage. European Polymer Journal. 103:179-186. https://doi.org/10.1016/j.eurpolymj.2018.04.018S17918610
First report of caprine abortions due to Chlamydia abortus in Argentina.
Infectious abortions of goats in Argentina are mainly associated with brucellosis and toxoplasmosis. In this paper, we describe an abortion outbreak in goats caused by Chlamydia abortus. Seventy out of 400 goats aborted. Placental smears stained with modified Ziehl-Neelsen stain showed many chlamydia-like bodies within trophoblasts. One stillborn fetus was necropsied and the placenta was examined. No gross lesions were seen in the fetus, but the inter-cotyledonary areas of the placenta were thickened and covered by fibrino-suppurative exudate. The most consistent microscopic finding was found in the placenta and consisted of fibrinoid necrotic vasculitis, with mixed inflammatory infiltration in the tunica media. Immunohistochemistry of the placenta was positive for Chlamydia spp. The results of polymerase chain reaction targeting 23S rRNA gene performed on placenta were positive for Chlamydia spp. An analysis of 417 amplified nucleotide sequences revealed 99% identity to those of C. abortus pm225 (GenBank AJ005617) and pm112 (GenBank AJ005613) isolates. To the best of our knowledge, this is the first report of abortion associated with C. abortus in Argentina
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