El paper de l’església a l’edat mitjana.

Història dels orígens polèmics de l'economia d'una institució multisecular

LES SAGRERES

El terme sagrera té els seu orígens en el dret visigòtic i definia un espai sagrat de trenta passos eclesiàstics a l’entorn de l’esglesia

El Pregó

La història del pregó i del pregoner és també la història dels missatgers

Single-pixel imaging of the retina through scattering media

Imaging the retina of cataractous patients is useful to detect pathologies before the cataract surgery is performed. However, for conventional ophthalmoscopes, opacifications convert the lens into a scattering medium that may greatly deteriorate the retinal image. In this paper we show, as a proof of concept, that it is possible to surpass the limitations imposed by scattering applying to both, a model and a healthy eye, a newly developed ophthalmoscope based on single-pixel imaging. To this end, an instrument was built that incorporates two imaging modalities: conventional flood illumination and single-pixel based. Images of the retina were acquired firstly in an artificial eye and later in healthy living eyes with different elements which replicate the scattering produced by cataractous lenses. Comparison between both types of imaging modalities shows that, under high levels of scattering, the single-pixel ophthalmoscope outperforms standard imaging methods

Sperm quality assessment in honey bee drones

The quality of honey bee drone semen is relevant in different contexts, ranging from colony productivity to pathology, toxicology and biodiversity preservation. Despite its importance, considerably less knowledge is available on this subject for the honey bee when compared to other domestic animal species. A proper assessment of sperm quality requires a multiple testing approach which discriminates between the different aspects of sperm integrity and functionality. Most studies on drone semen quality have only assessed a few parameters, such as sperm volume, sperm concentration and/or sperm plasma membrane integrity. Although more recent studies have focused on a broader variety of aspects of semen quality, some techniques currently used in vertebrates, such as computer-assisted sperm analysis (CASA) or multiparametric sperm quality testing, still remain to be developed in the honey bee. This may be attributed to the particular sperm morphology and physiology in this species, requiring the development of technologies specifically adapted to it. This article reviews the present knowledge of sperm quality in honey bee drones, highlighting its peculiarities and proposing future lines of research

App Web SCRUM

El objetivo de este proyecto es realizar una herramienta web capaz de gestionar los proyectos informáticos que apliquen Scrum en su desarrollo. Scrum es una metodología ágil, es decir, un tipo de metodología basada en la iteración e incrementación del desarrollo donde los requisitos evolucionan constantemente. La herramienta se ha implementado bajo el Framework de ASP.NET que nos ofrece Microsoft para implementar sitios Web dinámicos. Básicamente, se encargará de gestionar los roles de Scrum y todas las funcionalidades que requiera un proyecto siguiendo esta metodología. Además, se podrán generar informes sobre los proyectos y mantener la seguridad en los datos gracias a copias automatizadas. La arquitectura que se ha adoptado para hacer esta herramienta, es una arquitectura MVC (Modelo-Vista- Controlador) que por las características que ofrece de segmentación, división de responsabilidades y pruebas unitarias es ideal para herramientas web. Además se ha utilizado un ORM (Object Relational Mapping), que nos ofrece el Framework de .NET de forma nativa, para implementar la capa de persistencia. Como complemento adicional y para mostrar el uso de un Framework de terceros se ha introducido Log4Net que nos ofrece Apache para la generación de logs en la aplicación

Molecular Sieving Properties of Nanoporous Mixed-Linker ZIF-62: Associated Structural Changes upon Gas Adsorption Application

The evaluation of the flexibility in zeolitic imidazolate frameworks (ZIFs) has been very useful to understand their performance in gas adsorption and separation applications. Here, we have evaluated the adsorption properties of a nanoporous mixed-linker ZIF-62 using a combination of gas adsorption measurements, grand canonical Monte Carlo simulations, and synchrotron X-ray powder diffraction under operando conditions. While adsorption studies in nanoporous ZIF-62 at 77 K and atmospheric pressure predict a large O2/N2 separation ability, computational studies anticipate that the observed differences must be attributed to kinetic restrictions of N2 to access the internal porosity at cryogenic temperatures. Interestingly, upon a small increase in the adsorption temperature (90 K vs 77 K), both N2 and O2 are able to access the inner porous structure through the promotion of a phase transition (ca. 3.8% volume expansion) upon gas adsorption. This narrow phase (np) to expanded phase (ep) structural transition in ZIF-62 is completely suppressed above 150 K. Based on the excellent molecular sieve properties of nanoporous ZIF-62 for O2/N2 at cryogenic temperatures, we extended our study to the adsorption of linear and branched hydrocarbons. This study predicts the preferential adsorption of alkanes over alkenes in ZIF-62 for small hydrocarbons (C2), while in the case of C3 hydrocarbons and above, the adsorption process is mainly defined by kinetic restrictions.J.S.-A. acknowledges financial support from the MINECO (Projects MAT2016-80285-p and PID2019-108453GB-C21). The authors acknowledge ALBA for providing beamtime (Project No. 2019023264). Computational work was supported by the Cambridge High-Performance Computing Service, the Cambridge Service for Data-Driven Discovery (CSD3)

Ferro- to antiferromagnetic crossover angle in diphenoxido- and carboxylato-bridged trinuclear Ni(II)2-Mn(II) complexes: experimental observations and theoretical rationalization

Three new trinuclear heterometallic NiII-MnII complexes have been synthesized using [NiL] metalloligand where H2L = N,N′- bis(salicylidene)-1,3-propanediamine. The complexes [(NiL)4Mn2(OCn)4(CH3OH)4]·2CH3OH (1), [(NiL)4Mn2(OPh)4(CH3OH)2]·H2O (2) and [(NiL)4Mn(OSal)2(CH3OH)2] (3) (where OCn = cinnamate, OPh = phenylacetate, OSal= salicylate) have been structurally characterized. In all three complexes, in addition to the double phenoxido bridge, the two terminal NiII atoms are linked to the central MnII by means of syn-syn bridging carboxylate, giving rise to a linear structure. Complexes 1 and 2 with Ni-O-Mn angle of 97.24 and 96.43° respectively exhibit ferromagnetic interactions ( JNi-Mn = +1.38 and +0.50 cm-1 respectively) whereas 3 is antiferromagnetic (JNi-Mn= -0.24 cm-1) having Ni-O-Mn angle of 98.51°. DFT calculations indicate that there is a clear magneto-structural correlation between Ni-O-Mn angle and JNi-Mn values which is in agreement with the experimental results