Presentación: Avances recientes sobre el liderazgo escolar en países anglófonos

Los estudios sobre el liderazgo escolar están teniendo un desarrollo creciente en los últimos años. El interés por comprender y analizar sus características, estilos, procesos y efectos ha movilizado a numerosos especialistas y grupos de investigación en países y contextos diferentes. Animados por esa inquietud, los autores de este artículo, de las Universidades de Barcelona, Autónoma de Barcelona y de California, nos propusimos compartir conocimientos y profundizar en su estudio durante el período sabático del profesor Charles Slater en la Universidad de Barcelona en el curso 2012-2013

Towards social justice in highly complex schools in Catalonia, Spain

This study investigated social justice from the point of view of school directors, teachers, and parents. We chose two schools that were undergoing major demographic changes because of increased immigration into Catalonia, Spain. They were both classified as "schools of maximum complexity" because of their socio-economic characteristics. The research questions focused on how directors, teachers, and parents give meaning to social justice and what actions they take to achieve it. Teachers and principals adopted practices that have been described in leadership literature as transformational, such as building trust and challenging the process; they only occasionally showed transformative practices like those described by Santamaria (2014) as applied critical leadership (ACL). They were motivated by seeing the needs of migrant families and students with special needs. They seriously considered social cohesion and believed that all students should be given the same opportunities and treated fairly. While these principals wanted to guide teachers to see their work in new ways and develop practices to address the needs of a changing student population, they did not reflect on the connection between day-to-day problems and the larger social system. This critical perspective is essential to ACL

Homogeneity of Interspecific Hybrids Between Saccharomyces cerevisiae and Saccharomyces uvarum by Phenotypic and Transcriptional Analysis

Oenological traits, such as temperature profile and production of certain metabolites, were tested for four interspecifc hybrids obtained by"spore to spore" crossing between Saccharomyces cerevisiae and Saccharomyces uvarum strains and uniformity of their inheritance was found. PCR/RFLP analysis of ITS regions was carried out to confirm the hybrid nature of the strains. They showed an additive profile with five bands of the respective 325, 230, 170 and 125 bp. Finally gene expression study was performed by comparative DNA macroarray analysis of the hybrids and the preliminary results showed that the global gene expression patterns of hybrids are remarkably similar to one another. In conclusion, the data obtained by two different approaches, such as metabolic and transcriptomic strategies, suggest a large degree of homogeneity among interspecific hybrids between S. cerevisiae and S. uvarum. Moreover, the uniformity of F1 hybrids advises that the oenological trait inheritance mechanism is highly constant and reproducible

Women becoming social justice leaders with an inclusive view in Costa Rica, Mexico and Spain

This study looks at three female school directors in Costa Rica, Mexico, and Spain who worked under challenging conditions to establish social justice. We were particularly interest in how they learned to become social justice leaders. Qualitative interviews were used to hear directly from the school directors about their experiences. Transcripts were analyzed for common themes. The commitment of these directors to social justice came from early family experiences that gave them strength and core values. They met adversity in young adulthood which reinforced their commitment to inclusive leadership

Impact of Nutritional Stress on Honeybee Gut Microbiota, Immunity, and Nosema ceranae Infection

Honeybees are important pollinators, having an essential role in the ecology of natural and agricultural environments. Honeybee colony losses episodes reported worldwide and have been associated with different pests and pathogens, pesticide exposure, and nutritional stress. This nutritional stress is related to the increase in monoculture areas which leads to a reduction of pollen availability and diversity. In this study, we examined whether nutritional stress affects honeybee gut microbiota, bee immunity, and infection by Nosema ceranae, under laboratory conditions. Consumption of Eucalyptus grandis pollen was used as a nutritionally poor-quality diet to study nutritional stress, in contraposition to the consumption of polyfloral pollen. Honeybees feed with Eucalyptus grandis pollen showed a lower abundance of Lactobacillus mellifer and Lactobacillus apis (Firm-4 and Firm-5, respectively) and Bifidobacterium spp. and a higher abundance of Bartonella apis, than honeybees fed with polyfloral pollen. Besides the impact of nutritional stress on honeybee microbiota, it also decreased the expression levels of vitellogenin and genes associated to immunity (glucose oxidase, hymenoptaecin and lysozyme). Finally, Eucalyptus grandis pollen favored the multiplication of Nosema ceranae. These results show that nutritional stress impacts the honeybee gut microbiota, having consequences on honeybee immunity and pathogen development. Those results may be useful to understand the influence of modern agriculture on honeybee health.Fil: Castelli, L.. Instituto de Investigaciones Biológicas "Clemente Estable"; UruguayFil: Branchiccela, B.. Instituto de Investigaciones Biológicas "Clemente Estable"; UruguayFil: Garrido, Paula Melisa. Universidad Nacional de Mar del Plata. Instituto de Investigaciones en Producción, Sanidad y Ambiente - Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mar del Plata. Instituto de Investigaciones en Producción, Sanidad y Ambiente; ArgentinaFil: Invernizzi, Ciro. No especifíca;Fil: Porrini, Martín Pablo. Universidad Nacional de Mar del Plata. Instituto de Investigaciones en Producción, Sanidad y Ambiente - Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mar del Plata. Instituto de Investigaciones en Producción, Sanidad y Ambiente; ArgentinaFil: Romero, H.. No especifíca;Fil: Santos, E.. No especifíca;Fil: Zunino, P.. Instituto de Investigaciones Biológicas "Clemente Estable"; UruguayFil: Antúnez, Karina. Instituto de Investigaciones Biológicas "Clemente Estable"; Urugua