Mariana Sanchez

© 2015 Society for Experimental Biology, Association of Applied Biologists and John Wiley & Sons Ltd.Reduced cell wall recalcitrance and increased C6 monosaccharide content are desirable traits for future biofuel crops, as long as these biomass modifications do not significantly alter normal growth and development. Mixed-linkage glucan, a cell wall polysaccharide only present in grasses and related species among flowering plants, is comprised of glucose monomers linked by both β-1,3 and β-1,4 bonds. Previous data have shown that constitutive production of MLG in barley severely compromises growth and development. Here, we used spatio-temporal strategies to engineer Arabidopsis thaliana plants to accumulate significant amounts of MLG in the cell wall by expressing the rice CslF6 MLG synthase using secondary cell wall and senescence-associated promoters. Results using secondary wall promoters were suboptimal. When the rice MLG synthase was expressed under the control of a senescence-associated promoter, we obtained up to four times more glucose in the matrix cell wall fraction and up to a 42% increase in saccharification compared to control lines. Importantly, these plants grew and developed normally. The induction of MLG deposition at senescence correlated with an increase of gluconic acid in cell wall extracts of transgenic plants in contrast to the other approaches presented in this study. MLG produced in Arabidopsis has an altered structure compared to the grass glucan, which likely affects its solubility, while its molecular size is unaffected. The induction of cell wall polysaccharide biosynthesis in senescing tissues offers a novel engineering alternative to enhance cell wall properties of lignocellulosic biofuel crops.

States and societies are increasing concerned about issues associated with population diversity. When it comes to making legislative and political decisions, one sees a constant dissociation between the use of demographic concepts, demography and health and bioethics, along with very little academic impact and awareness in this area. The vast majority of countries lack an ethical framework that guarantees non-manipulation of the human being. The objectives of population policies go against children, the elderly and the disabled; their foundation is more ideological and utilitarian in nature. Opportunities for academic training and awareness on this subject are lacking.

El objetivo de este estudio es analizar las investigaciones de pregrado en Literatura de una universidad peruana. Se realizó el mapeo sistemático de diez trabajos publicados entre el 2017 y 2022. Los resultados evidencian preferencia por la investigación en literatura peruana y que el género literario más estudiado es el narrativo. Se concluye que en los trabajos no se describen claramente los métodos científicos ni las metodologías de análisis literario; debido a su diversidad, a que los estudios literarios poseen una complejidad interdisciplinaria, y porque los esfuerzos educativos universitarios en investigación se centran en los últimos semestres.

El trabajo tiene los dos siguientes objetivos. En primer lugar, repasar la literatura más reciente sobre Intangibles y Capital Intelectual para poner de manifiesto los avances sobre estos temas y las lagunas que subsisten. En segundo lugar, presentar los retos a los que, a medio plazo, hay que hacer frente para incrementar la utilidad de este marco de análisis en la creación y difusión de conocimiento y en el diseño de políticas públicas. Dichos retos hacen referencia, básicamente, a la necesidad de contar con datos homogéneos, públicos y frecuentes para analizar las consecuencias de la existencia y gestión del Capital Intelectual en el desempeño de las organizaciones. Se sugieren los mecanismos para superar esos retos y las características que deben tener los necesarios acuerdos supranacionales que se habiliten al efecto.

Even though sacred scriptures emphasize the key role that Creation and respect for living creatures play in all religions, the so-called religious schools seem to show little interest in putting this sacred mandate into effect. To shed light on this subject, this work investigates the role of teachers in the process, focusing on their environmental competencies. Our hypotheses are tested through a structural equation model on a sample of 214 biology and religion teachers from 118 Catholic schools in Spain who voluntary participated in a survey. The research findings confirm that it is crucial that environmental competencies are developed in teachers to enable the greening of schools. Theoretical and practical implications for defining the job training of teachers in religious schools are drawn from the study.

The attention to ethics has gradually become a concurrent topic of modern companies’ management. In the last years Social Responsibility has become a key issue in the strategic agenda of competitive agriculture cooperatives. However, reputation management has not been a visible strength in the cooperative enterprises. First of all, this work theoretically analyzes the relationship between Social Responsibility and reputation in cooperatives. Later, from a practical point of view, we carry on an empirical analysis focused on the olive oil cooperatives in the south of Spain, in the province of Jaén. With respect to the previous studies on the topic, this work reveals a main reason of interest reinforcing the role of research in addressing real problems of cooperatives. The article points out the characteristics of this kind of agribusiness and shows the importance of the adoption of a responsible orientation in fostering reputation for creating sustainable competitive advantages.

ABSTRACTWhile the emergence of a new scientific culture in 16th-century Europe is well known, the role of the actors of the Hispanic New World in this time of renewal of knowledge has long been judged marginal for two reasons: first, because the strong presence of the Inquisition in the Hispanic World has been considered by historians to have been an obstacle for research or scientific innovation; and second, because the discontinuity of the territories of the Hispanic Monarchy and the problem of distances between Spain and the New World have long been interpreted in ways that suggest the marginality and peripheral status of the American colonies. However, some works counterbalance this dismissal and shed new light on the scientific activity of the Hispanic New World. This is the case with the treatise Arte de los Metales, by the secular priest Alvaro Alonso Barba, which would achieve remarkable fame and circulation, and would become a seminal work in the fields of metallurgy and mining until the mid-1700s. The article demonstrates that this treatise also presents ideas that can be traced back to a set of Paracelsian ideas combining alchemy, pharmacopoeia, and medicine, and studies specific examples of these ideas – the description of three fundamental substances as components of all matter, references to Epatica sulfuris, an oil capable of turning silver into gold and curing certain diseases; and the use of antimony – that together testify to the spread of the ideas of Basil Valentine and of Paracelsian influences. From this point of view, Arte de los Metales can be viewed as part of a tradition unexpectedly renewed by the author through many observations based on his own work in Peru and the discoveries he made thanks to alternative techniques. This demonstrates the richness and diversity of knowledge rooted in the New World, and links Alonso Barba’s scholarly activity to some of the great schools of thought that spanned the Early Modern European world.

New aspects of spectral fluctuations of (quantum) chaotic and diffusive systems are considered, namely autocorrelations of the spacing between consecutive levels or spacing autocovariances. They can be viewed as a discretized two point correlation function. Their behavior results from two different contributions. One corresponds to (universal) random matrix eigenvalue fluctuations, the other to diffusive or chaotic characteristics of the corresponding classical motion. A closed formula expressing spacing autocovariances in terms of classical dynamical zeta functions, including the Perron–Frobenius operator, is derived. It leads to a simple interpretation in terms of classical resonances. The theory is applied to zeros of the Riemann zeta function. A striking correspondence between the associated classical dynamical zeta functions and the Riemann zeta itself is found. This induces a resurgence phenomenon where the lowest Riemann zeros appear replicated an infinite number of times as resonances and sub-resonances in the spacing autocovariances. The theoretical results are confirmed by existing “data.” The present work further extends the already well known semiclassical interpretation of properties of Riemann zeros