Juliana Lopez

La agroecología tiene como objetivo el conocimiento de los elementos y procesos claves en el funcionamiento de los agrosistemas, para su eficaz gestión en armonía con el ambiente. La protección vegetal ha sido enfocada tradicionalmente, bajo el concepto de lucha y control, utilizando arsenales químicos o biológicos y, en estos momentos, biotecnológicos. La aplicación de criterios ecológicos en protección vegetal ha permitido desarrollar procesos como la biofumigación, fundamentada en la utilización de los gases resultantes de la biodescomposición de la materia orgánica para el manejo de organismos patógenos de los vegetales. Es de esperar que el futuro de la agricultura muestre una mayor preocupación por el ambiente, la conservación de los recursos naturales, la salud de las personas y se destaque su contribución a la reducción de la pobreza, así como su aportación al desarrollo de los agrocombustibles.

In contemporary industrial times, the success of a company is largely dependent on having effective leadership. Additionally, a leader's capacity for change management is essential when confronted with novel difficulties and shifts. Effective leadership styles are important, as many studies have shown, but not all companies have been able to implement them successfully and witness increases in employee loyalty and performance. The positivist paradigm is applied in this study through empirical research, wherein hypotheses are tested using an empirical model that demonstrates the causal relationship between the model's components. The study's conclusions show how green leadership, digital leadership, and servant leadership improve and have notable effects on the performance of the industrial sector. This research implies that the industrial sector has benefited greatly from the three types of leadership in terms of increased productivity and creativity. In particular, it has been shown that digital leadership, green leadership, and servant leadership all improve an organization's performance as a whole. The study's findings add to the body of knowledge on leadership, support future research with empirical evidence, and have significant theoretical and practical implications for the administrative science community.

The main objective of this study is to analyse the relationship between peer school victimization and some risk and protection factors and to compare the differences by role in victimization with those of non-involved bystanders. Our participants were 1,264 secondary students (M = 14.41, SD = 1.43) who participated voluntarily, although an informed consent was requested. A logistic regression model (LR) was used in order to identify the victim’s potential risks and protective factors related to non-involved bystanders. A multiple LR and a forward stepwise LR (Wald) were used. The results showed the variables related to the victim profile were: individual features (to be male, to be at the first cycle of compulsory Secondary Education and a few challenging behaviours), school environments (i.e. school adjustment), family environment (parental styles like authoritarianism) and social environment (i.e. friends who occasionally show a positive attitude towards drug consumption and easy access to drugs, access to drugs perceived as easy, rejection by peers or lack of social acceptance and social maladjustment). The results of the study will allow tackling prevention and intervention actions in schools, families and social environment in order to improve coexistence at school and to assist the victimized students in the classroom.

There have been two main lines in the literature on restricted games: the first line was started by Myerson (1977) that studied graph-restricted games an the second one was initiated by Faigle (1989). The present paper provides a unified way to look on the literature and establishes connections between the two different lines on restricted games. The strength and advantages of this unified approach becomes clear in the study of the inheritance of the convexity from the game to the restricted game where an interesting result by Nouweland and Borm (1991) on the convexity of graph-restricted games is turned into a direct consequence of the corresponding result by Faigle (1989), by means of this relation.