SMEs´ absorptive capacities and large firms´ knowledge spillovers: Micro evidence from Mexico

The aim of this paper is to analyze the relationship between large firms´ knowledge spillovers and small and medium enterprises absorptive capacities. We build ad-hoc indicators for these two concepts following a factor analysis methodology, and we carry out a structural equations analysis to determine the relationship between them. Based on firm level original data from a survey that focuses on SMEs in a Mexican locality, this paper argues that in a low-tech and mature sector, such as the machine shop sector, that operates in a loosely articulated local system, two knowledge spillover mechanisms are relevant: the backward linkages and the employees´ mobility. Regarding SMEs’ absorptive capacities they are strongly influenced by organizational capabilities and innovation and learning activities. We also argue that large firms’ knowledge spillovers are strongly correlated to SMEs absorptive capacities within the sector and locality analyzed.Absorptive capacities; Knowledge spillovers; SME-large firms interaction; Mexico

The Metallicity Gradient of the Old Galactic Bulge Population

Understanding the structure, formation and evolution of the Galactic Bulge requires the proper determination of spatial metallicity gradients in both the radial and vertical directions. RR Lyrae pulsators, known to be excellent distance indicators, may hold the key to determining these gradients. Jurcsik & Kovacs (1996) has shown that RR Lyrae light curves and the phase difference of their Fourier decomposition, {\phi}31, can be used to estimate photometric metallicities. The existence of galactic bulge metallicity gradients is a currently debated topic that would help pinpoint the Galaxy's formation and evolution. A recent study of the OGLE-III Galactic Bulge RR Lyrae Population by Pietrukowicz et al. (2012) suggests that the spatial distribution is uniform. We investigate how small a gradient would be detectable within the current S/N levels of the present data set, given the random and systematic errors associated with the derivation of a photometric metallicity versus spatial position relationship.Comment: Proc. of the workshop "Asteroseismology of stellar populations in the Milky Way" (Sesto, 22-26 July 2013), Astrophysics and Space Science Proceedings, (eds. A. Miglio, L. Girardi, P. Eggenberger, J. Montalban

Gender diversity on Boards of Directors and business success

This paper analyzes the relationship between gender diversity on Boards of Directors and business success. For this purpose, the authors used one sample of companies listed on the Madrid Stock Exchange. The paper analyzes a period of three years, between 2005 and 2007. A descriptive analysis has been carried out. Women’s labor status has been studied in these three years. The paper also covers a panel analysis. The results show that there are few women in decision-making positions, and Gender diversity and business success are not related

Does Board Gender Diversity Influence Financial Performance? Evidence from Spain

In recent years, several countries have enacted guidelines and/or mandatory laws to increase the presence of women on the boards of companies. Through these regulatory interventions, the aim is to eradicate the social and labor grievances that women have traditionally experienced and which has relegated them to smaller-scale jobs. Nevertheless, and despite the advances achieved, the female representation in the boardroom remains far from the desired levels. In this context, it is now necessary to enhance the advantages of board gender diversity from both ethical and economic points of view. This article examines the relation between board gender diversity and economic results in Spain: the second country in the world to legally require gender quotas in boardrooms and historically characterized by a minimal female participation in the workforce. Based on a sample of 125 non-financial firms listed on the Madrid Stock Exchange from 2005 to 2009, our findings show that in the period analyzed the increase of the number of women on boards was over 98 %. This suggests that compulsory legislation offers an efficient framework to execute the recommendation of Spanish codes of good governance by means of the increase in the number of women in the boards of firms. Furthermore, we find that the increase in the number of women on the boards is positively related to higher economic results. Therefore, both results suggest that gender diversity in boardrooms should be incremented, mandatory laws being a key factor to do so

ApuA, a multifunctional x-glucan-degrading enzyme of Streptococcus suis, mediates adhesion to porcine epithelium and mucus

We have identified apuA in Streptococcus suis, which encodes a bifunctional amylopullulanase with conserved -amylase and pullulanase substrate-binding domains and catalytic motifs. ApuA exhibited properties typical of a Gram-positive surface protein, with a putative signal sequence and LPKTGE cell-wall-anchoring motif. A recombinant protein containing the predicted N-terminal -amylase domain of ApuA was shown to have -(1,4) glycosidic activity. Additionally, an apuA mutant of S. suis lacked the pullulanase -(1,6) glycosidic activity detected in a cell-surface protein extract of wild-type S. suis. ApuA was required for normal growth in complex medium containing pullulan as the major carbon source, suggesting that this enzyme plays a role in nutrient acquisition in vivo via the degradation of glycogen and food-derived starch in the nasopharyngeal and oral cavities. ApuA was shown to promote adhesion to porcine epithelium and mucus in vitro, highlighting a link between carbohydrate utilization and the ability of S. suis to colonize and infect the host

Entanglement generation in relativistic quantum fields

We present a general, analytic recipe to compute the entanglement that is generated between arbitrary, discrete modes of bosonic quantum fields by Bogoliubov transformations. Our setup allows the complete characterization of the quantum correlations in all Gaussian field states. Additionally, it holds for all Bogoliubov transformations. These are commonly applied in quantum optics for the description of squeezing operations, relate the mode decompositions of observers in different regions of curved spacetimes, and describe observers moving along non-stationary trajectories. We focus on a quantum optical example in a cavity quantum electrodynamics setting: an uncharged scalar field within a cavity provides a model for an optical resonator, in which entanglement is created by non-uniform acceleration. We show that the amount of generated entanglement can be magnified by initial single-mode squeezing, for which we provide an explicit formula. Applications to quantum fields in curved spacetimes, such as an expanding universe, are discussed.Comment: 8 pages, 2 figures, Ivette Fuentes previously published as Ivette Fuentes-Guridi and Ivette Fuentes-Schuller; v2: published version (online), to appear in the J. Mod. Opt. Special Issue on the Physics of Quantum Electronic

La majoria d'edat de la cardiologia a l'Hospital Clínic de Barcelona

És un estudi on s’explica l’evolució de la cardiologia clínica i de la cardiologia quirúrgica a l’Hospital Clínic de Barcelona. Fins a finals dels anys seixanta era un hospital gairebé exclusiu per als malalts empestats, malalts mentals i transeünts, sense una estructura que afavorís la investigació, que era fruit d’una labor individual. L’afany de protagonisme dels càtedres de medicina interna i especialment les de patologia quirúrgica va fer que, fins a principis dels anys setanta, no es modernitzés la cardiologia clínica i que la cirurgia cardíaca moderna no existís fins els anys vuitanta