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Study on the Antioxidant Activity of Grape Stems (Vitis vinifera). A Preliminary Assessment of Crude Extracts  [PDF]
Antonia Llobera
Food and Nutrition Sciences (FNS) , 2012, DOI: 10.4236/fns.2012.34070
Abstract: The antioxidant activity of 80% ethanol and 70% acetone extracts of stems from red and white grapes (Vitis vinifera) used in wine industry were evaluated to determine their feasibility as natural antioxidants. The results showed that all grape stem extracts were rich in total polyphenolic compounds and flavanols and had clear antioxidant activities. The free radical-scavenging capacity of the extracts was determined using the DPPH (2,2-diphenyl-1-picrylhydrazyl) method. The extracts obtained from red grape stem present EC50 values of 0.14 g dm/g DPPH (acetone extract) and 0.20 g dm/g DPPH (ethanol extract) while the extracts obtained from white grape stem present EC50 values of 0.26 g dm/g DPPH (acetone extract) and 0.37 g dm/g DPPH (ethanol extract). There are significant correlations between the total content of polyphenols and the antioxidant activity (R2 = 0.9352) and between the flavanols content and the antioxidant activity (R2 = 0.9404) of the grape stem extracts obtained.
On the Design of Effective E-Commerce Applications: An ISO-Based Lifecycle Model  [PDF]
Antonia Stefani
Journal of Computer and Communications (JCC) , 2018, DOI: 10.4236/jcc.2018.65002
Abstract: The provision of services as e-commodities and the wide use of networked business models have driven buyer experience to new heights. Innovation, coupled with quality is the competitive advantage e-commerce vendors strive to achieve when designing or re-designing their software. In terms of quality, evaluation stood in the spotlight for many years. However, software analysis and design based on quality models have been used mostly for understanding, rather than improving. In this work, we present a new model for the analysis and design of e-commerce software systems mapped to the software life-cycle process. Quality control procedures are mapped to every phase, from initiation and design to delivery. Based on current ISO standards such as ISO25000 series, this work discusses technical and managerial principles that need to be applied in order to obtain quality e-commerce software.
Análisis terminológico a través de la producción científica relativa a los libros electrónicos
Gómez-Díaz, Raquel,Cordón-García, José Antonio,Jarvio-Fernández, Antonia Olivia,Alonso-Arévalo, Julio
Revista Espa?ola de Documentación Científica , 2013,
Abstract: Despite being a relatively recent phenomenon, e-books have been subject to various changes: in technology, in the development of reading devices, and in various scientific and commercial practices. All these changes ranging from the purely terminological to the technical and conceptual are reflected in the scientific collections of different databases. Therefore, a diachronic analysis of this production will permit detection of the transformations produced, as well as the contextualization of this phenomenon from a scientific, social and cultural point of view. This leads to a combination of different tools that allow textual and bibliometric analysis and that produce results that can be extrapolated to similar studies. Los libros electrónicos, a pesar de ser un fenómeno relativamente reciente, poseen un recorrido cambiante sujeto a las mutaciones tecnológicas, al desarrollo de dispositivos de lectura, y a las distintas prácticas científicas y comerciales. Todos estos cambios que van de lo puramente terminológico a lo técnico y conceptual tienen su reflejo en la producción científica recogida en las distintas bases de datos, por lo que un análisis diacrónico de la misma permitirá detectar las trasformaciones que se han producido así como la contextualización de dicho fenómeno desde un punto de vista científico, social y cultural. Para ello se procede a la combinación de distintas herramientas informáticas que permiten hacer el análisis bibliométrico y textual, así como la obtención de resultados extrapolables a estudios similares.
Chungará (Arica) , 2010, DOI: 10.4067/S0717-73562010000100031
Abstract: sixteenth century sources associate the notion of labour in the andes with that of enjoyment, while most colonial spaniards and modern anthropologists see it as obligatory, ignoring its ritual dimensions. generally speaking, western theorists of labour, whether marxist or not, link labour and production with alienation. drawing on her fieldwork experience, the author notes that there is no aymara word for labour in general. more important is the purpose and beneficiary of labour. andeans not only value labour aimed at strengthening their own social networks, but more specifically labour that benefits the community to which they belong. the andean ethic of labour therefore leads it to be considered as a blessing, in opposition to judaeo-christian ways of considering it as a curse.
Pensadoras de peso: o pensamento de Judith Butler e Adriana Cavarero
Guaraldo, Olivia;
Revista Estudos Feministas , 2007, DOI: 10.1590/S0104-026X2007000300010
Abstract: the work presents the standpoint of two important contemporary feminist philosophers, adriana cavarero and judith butler, on subjectivity and relationality, showing how both moved away from the specific feminism motif in order to deepen and broaden their reflection on politics and ethics. calling tradition into question, cavarero agrees neither with the metaphysical binary, nor with the post-modern impersonality, combining a feminist and the arendtian perspectives of the subjectivity based on relationality. contrary to cavarero's thought, though, under butler's deconstructionist standpoint language shapes body and identity. subjectivity is "trapped" into social norms and values. both butler and cavarero rethink subjectivity based on relationality, that is, displacing politics from the immune individual and reallocating it on the vulnerable individual in relation with the other and with the social rules and values imposed on them.
Evaluación de un Sistema Discontinuo de Biodigestión Anaerobia para el tratamiento de desechos avicolas
Revista de la Facultad de Ingeniería Universidad Central de Venezuela , 2005,
Abstract: in the present study, carried out in guanare (venezuela), in the period between november 1998 and march 1999, the application of an anaerobic digestion process in a discontinuous flow (batch) system was evaluated for the treatment of hen manure and rice hulls, with the purpose of stabilization, biogas production and pathogen control. the main biogas production (0,249 m3/m3d) was obtained with a combination of the evaluated materials, in a retention time of 60 days. in the bacteriological study, we found bacteria of the escherichia, proteus, enterobacter and klebsiella groups. salmonella was not found. the parasitological study reported ascaridia, trichostrongylus, heterakis and eimeria. among the conclusions reached, we emphasize that the anaerobic mesophilic process exercises scarce control over bacteria of the enterobacteriaceae group, and no control was observed over the parasite eggs found. therefore, further studies into these aspects is considered important, so as to find alternatives of control and recommendations for a safe handling of manure.
Profile: Olivia Anderson
Olivia Anderson
Partnership : the Canadian Journal of Library and Information Practice and Research , 2011,
Les démographes et le temps Demographers and Time
Olivia Samuel
Temporalités , 2009,
Abstract: Cet article présente la fa on dont les démographes ont pris en compte la question du temps dans leurs travaux depuis l’après seconde guerre. Le temps, dimension centrale de la démographie, est à la fois un élément constitutif des instruments de mesure des phénomènes démographiques et un objet d’étude en soi. Les modalités de la prise en compte du temps ont considérablement évolué depuis les années 1950. L’approche synchronique, la plus fréquente alors, va être complétée par l’approche longitudinale, puis biographique et enfin multi-niveaux. A chacune de ces étapes, la question du temps (individuel ou collectif), de sa mesure et de sa signification, fait l’objet d’une réflexion qui rappellera la complexité de son appréhension. Après avoir mis en lumière ces étapes, l’article examine différents travaux démographiques qui ont pris le temps et les temporalités sociales comme objet d’étude, notamment au travers du repérage de l’age, de l’appartenance générationnelle ou encore des marqueurs de transitions. This article shows how demographers have dealt with the question of time since WWII. Time, a central dimension of demography, has been both a tool for measuring demographic phenomena and an object of study in itself, and the ways it has been taken into account have considerably developed since the 1950s. The most usual point of view at the time, which was synchronic, was later to be completed by a longitudinal, then biographical and finally multi-faceted approach. At each of these stages, the question of time (individual or collective), as well as of how to measure it and how to evaluate its significance, came under more scrutiny, reminding use how complex an object it is to grasp. After a review of these various stages, the paper examines those demographic studies that have focused on time and social temporalities, particularly through the factors of age, generation or transition markers.
Crescere errando: minori immigrati non accompagnati" (Clara Silva - Giovanna Campani)
Olivia Salimbeni
m@gm@ , 2005,
Abstract: La presenza in Italia di minori immigrati non accompagnati è un fenomeno recente e tuttavia in forte crescita. Questo testo raccoglie i risultati di quella che potremmo definire la seconda di tre tappe di una ricerca europea incentrata sullo studio del fenomeno dei minori immigrati non accompagnati, avviata nel 2000 e da poco terminata. L’indagine è stata svolta nel quadro di finanziamento del 'Programma Daphne' della Commissione Europea e ha riguardato nelle prime due fasi tre realtà europee, Italia, Germania e Finlandia e nella terza altre realtà quali il Portogallo, la Spagna, la Francia e la Grecia.
Piccoli schiavi senza frontiere: il traffico dei minori stranieri in Italia (Francesco Carchedi)
Olivia Salimbeni
m@gm@ , 2006,
Abstract: Il fenomeno del traffico di esseri umani in Italia, in particolare di donne e minori, ha assunto, e in misura crescente negli ultimi dieci anni, proporzioni tali da preoccupare governi e istituzioni di controllo e da indurre un ricorso a misure sempre più severe di contrasto contro le organizzazioni che lo gestiscono. Il traffico degli esseri umani e della prostituzione coercitiva appare come la nuova frontiera che scaturisce dai processi di globalizzazione selvaggia tesi ad alimentare settori significativi del mercato mondiale del crimine organizzato. Si tratta ormai di un’emergenza sociale che ripropone con forza nel terzo millennio condizioni di grave sfruttamento, configurabile come para-schiavistiche, proprie del secolo scorso.
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