Suchergebnisse

The aim of this work was to investigate the possibility of combination between micro-waves and ultra-sounds in order to determinate their impact on quality parameters, antioxidant capacity and phenolic compounds as well as fatty acid composition. The protocol consisted in microwave followed by a sonication treatment of olive paste for 5, 10 and 15 min. Results showed that the total phenolic content of olive oil increased positively with the increasing time of treatment ranging from 356 to ~ 639 mg GAE.kg−1 of olive oil. On the other hand, the fatty acid profiles of all studied oils were determined by GC-FID. Besides, olive oil obtained after 15 min of microwave olive past treatment followed by 10 or 15 min of ultrasound treatment showed that these oils had the highest value of Z-vaccenic (C18:1n-7) + Oleic (C18:1n-9) acids. These results encourage further developments for a combined continuous microwave and ultrasonic conditioning technology to fasten the olive oil extraction, to enhance total phenolic, chlorophyll as well as carotenoid contents and Fatty acid composition.

This study was designed to optimize maceration (ME) and ultrasound-assisted extraction (UAE) parameters (extraction time X1, temperature X2, solvent/mass Ratio X3 and Ethanol concentration X4) of antioxidant activity of Eucalyptus marginata L. leaves' using response surface methodology (RSM). The antioxidant activity was evaluated using the DPPH assay and ferric reducing antioxidant power (FRAP). The optimal conditions for ME and UAE of antioxidant compounds were: X1 (min) = 88 and 50, X2 (°C) = ~75 and ~79, X3 (ml/g) = 40 and 39.5 and X4 (% of ethanol) = 59.65 and 58.48, respectively. Consequently, these optimized ME and UAE methods have shown a potential application for the efficient extraction of polyphenolic antioxidants from Eucalyptus marginata L. by-products in several industries including nutraceutical and pharmaceutical.

The purpose of the paper is to analyze the perception of corporate social responsibility by corporate executives in the Moroccan context. To do so, we conducted a survey of seventy-four Moroccan corporate executives working in listed companies. Subjects were solicited by e-mail, sending them a questionnaire consisting of 37 items presented in the form of a five-point response scale (Likert scale). Our measurement scale was designed on the basis of Carroll's (1991) theoretical model of social responsibility. The study proposes a scale to measure corporate executives' perceptions of CSR in their company. The results of our study reveal two findings. The first one suggests that Moroccan corporate executives working in listed companies are more concerned about compliance with laws and ethical values than with a true CSR commitment. The second one highlights the fact that CSR commitment is a three-dimensional construct marked by a predominance of ethical-legal and philanthropic practices. The paper states the main conclusions of the study and provides some practical implications.

"Usually, we read news to form opinions and expand our knowledge. However, especially in the past years, more and more publications are moving apart from being objective. Therefore, we get biased knowledge. In this article, we aim to observe the way information is passed from a logical and rhetorical point of view in different publications. By this, we do not aim to evaluate the morality of the publications or journalists in questions, our aim is purely theoretical (i.e. logical and rhetorical). In order to be able to provide such an analysis, we picked different pieces of news with the same topic from various publications. The chosen topic is irrelevant to the theoretical content, therefore we do not aim to focus on its political or social implications. The decision was made in order to have sufficient material to provide a proper theoretical analysis. It should also be added that any evaluative terms that are going to be used in this article (e.g. 'biased', 'subjective', 'not objective', 'one-sided', etc.) are strictly directed to a theoretical perspective, not a moral, social or political one. As already mentioned, our aim is as theoretical as possible: we are interested in the logical and rhetorical structure of a piece of information. Keywords: logical fallacies, manipulation, rhetoric, arguments. "