Estilos comunicativos, vinculación universitaria y adaptación psicosocial

El presente estudio aborda la relación entre los estilos comunicativos de los estudiantes universitarios, su vinculación en la universidad y el nivel de adaptación psicosocial. Se analizan distintos estilos comunicativos en relación con el grado de vinculación universitaria y su influencia sobre el nivel de ansiedad, distimia, consumo de alcohol y dependencia de sustancias. Los datos han sido obtenidos mediante cuestionario administrado a una muestra representativa de 529 estudiantes universitarios. Los resultados indican la existencia de diferencias de género con respecto a algunos patrones comunicativos pero no en relación con la vinculación universitaria. Se constata también una relación estadísticamente significativa, aunque no muy elevada, entre los estilos comunicativos y la capacidad de los estudiantes para vincularse en el contexto universitario. Tanto los estilos comunicativos como la vinculación universitaria contribuyen a la explicación de la sintomatología afectiva, pero sólo los estilos comunicativos polémico y amigable contribuyen a la explicación del consumo de sustancias

Bump time-frequency toolbox: a toolbox for time-frequency oscillatory bursts extraction in electrophysiological signals

Background: oscillatory activity, which can be separated in background and oscillatory burst pattern activities, is supposed to be representative of local synchronies of neural assemblies. Oscillatory burst events should consequently play a specific functional role, distinct from background EEG activity – especially for cognitive tasks (e.g. working memory tasks), binding mechanisms and perceptual dynamics (e.g. visual binding), or in clinical contexts (e.g. effects of brain disorders). However extracting oscillatory events in single trials, with a reliable and consistent method, is not a simple task. Results: in this work we propose a user-friendly stand-alone toolbox, which models in a reasonable time a bump time-frequency model from the wavelet representations of a set of signals. The software is provided with a Matlab toolbox which can compute wavelet representations before calling automatically the stand-alone application. Conclusion: The tool is publicly available as a freeware at the address: http:// www.bsp.brain.riken.jp/bumptoolbox/toolbox_home.html

An insight into co-operativism

The concept of co-operativism is analysed in this report. As an introduction to the subject, the values that socially friendly businesses work with are mentioned, as well as, the basic differences with regard to capitalist companies. In order to broaden the model, seven basic principles that drive such companies are analysed. Recently, due to the economic crisis, many capitalist companies have changed their way of running the business and have opted for cooperatives. Therefore, the steps they have to follow to become part of this view will be considered. So as to introduce a more critical view, benefits and drawbacks of cooperative companies will be borne in mind. In addition, no theoretical model is complete if real examples are not provided, thus in the final part, four companies will be studied. The first one being a company that has always been part of a group of cooperatives and which has enjoyed positive results all over; the second one, a company that has experienced the benefits of leaving the group; the third one, the cornerstone of such group, whose effort to relaunch the company have failed; and the final one, an acquired company whose future is uncertain due to its parent company's decline. To conclude, the final section is going to be devoted to heighten the problems that cooperatives have and which may have compromised their status as alternative models to capitalism.

Combining phospholipases and a liquid lipase for one-step biodiesel production using crude oils

Background Enzymatic biodiesel is becoming an increasingly popular topic in bioenergy literature because of its potential to overcome the problems posed by chemical processes. However, the high cost of the enzymatic process still remains the main drawback for its industrial application, mostly because of the high price of refined oils. Unfortunately, low cost substrates, such as crude soybean oil, often release a product that hardly accomplishes the final required biodiesel specifications and need an additional pretreatment for gums removal. In order to reduce costs and to make the enzymatic process more efficient, we developed an innovative system for enzymatic biodiesel production involving a combination of a lipase and two phospholipases. This allows performing the enzymatic degumming and transesterification in a single step, using crude soybean oil as feedstock, and converting part of the phospholipids into biodiesel. Since the two processes have never been studied together, an accurate analysis of the different reaction components and conditions was carried out. Results Crude soybean oil, used as low cost feedstock, is characterized by a high content of phospholipids (900 ppm of phosphorus). However, after the combined activity of different phospholipases and liquid lipase Callera Trans L, a complete transformation into fatty acid methyl esters (FAMEs >95%) and a good reduction of phosphorus (P <5 ppm) was achieved. The combination of enzymes allowed avoidance of the acid treatment required for gums removal, the consequent caustic neutralization, and the high temperature commonly used in degumming systems, making the overall process more eco-friendly and with higher yield. Once the conditions were established, the process was also tested with different vegetable oils with variable phosphorus contents. Conclusions Use of liquid lipase Callera Trans L in biodiesel production can provide numerous and sustainable benefits. Besides reducing the costs derived from enzyme immobilization, the lipase can be used in combination with other enzymes such as phospholipases for gums removal, thus allowing the use of much cheaper, non-refined oils. The possibility to perform degumming and transesterification in a single tank involves a great efficiency increase in the new era of enzymatic biodiesel production at industrial scale.