64 research outputs found
La explicación histórica: el papel de las narrativas. Apuntes sobre “Narración y conocimiento” de Arthur C. Danto / The Historical Explanation: The Part Played by Narratives. Notes on Narration and Knowledge in Arthur C. Danto
No full textEl autor sostiene que Arthur C. Danto, al tratar de fundamentar a la historia como una ciencia positiva, una ciencia que explica y que por fuerza tiene que poder probarse objetivamente, ofreció elementos que hacen posible un conocimiento de algo episódico y no del cambio. Para mostrar esto se concentra en su concepción de las explicaciones históricas, poniendo especial atención en cómo aparece la expresión del cambio en ellas.Palabras clave: narrativa, Danto, filosofía, historia, ciencia. The author proposes that while Arthur C. Danto tried to found history as a positive science, one that explains and that necessarily has to be proven objectively, he offered elements that make the knowledge of episodes possible but not of change itself. In order to show this, the author considers Danto’s conception of historic explanations, paying special attention in how the expression of change appears in them.Keywords: narrative, Danto, philosophy, history, science. Artículo recibido: 8-2-2016Artículo aceptado: 15-10-201
Obtención de ingredientes bioactivos mediante tecnologías verdes
No full textEn los últimos años ha incrementado el interés en el desarrollo de procesos medioambientalmente limpios para la obtención de extractos y compuestos con actividad funcional (y alto valor añadido) a partir de fuentes naturales. Las ventajas de estos nuevos procesos son: su carácter ?verde? (GRAS, Generally Recognized As Safe), que permite garantizar la ausencia de contaminación en los productos e ingredientes obtenidos, y su eficacia, inocuidad y selectividad, que favorecen su implementación industrial. El objetivo del trabajo fue la obtención y caracterización química y funcional de ingredientes alimentarios con propiedades bioactivas a partir de semillas y vainas de caupí Colorado (Vigna unguiculata) del Nordeste Argentino. El método de extracción utilizado fue líquidos presurizados (PLE). Se realizó un diseño experimental por superficie de respuesta donde los factores fueron el número de ciclos de extracción (1-3), la temperatura (50-170 °C) y la composición del disolvente (medido como el porcentaje de etanol-agua (0-100%)). El resto de las condiciones de extracción se mantuvieron constantes considerando la experiencia previa del grupo. Las variables respuestas del diseño fueron el contenido total de polifenoles (TPC), el rendimiento de extracción (Y%), el valor TEAC (nmol trolox/g extracto) y el IC50 (µg/mL) (actividad antioxidante por radicales DPPH y ABTS). Para determinar las condiciones de extracción más adecuadas teniendo en cuenta los mejores valores posibles (mayor Y%, mayor TPC y TEAC e IC50 lo más baja posible), se realizó una optimización de respuesta múltiple considerando un peso estadístico similar para las cuatro variables de respuesta. Se determinó la composición química por cromatografía HPLC-MS/MS de los extractos de semillas y vainas obtenidos en las condiciones óptimas de extracción. La temperatura fue el factor más influyente en el rendimiento de extracción en semillas y vainas. Además, a partir de las superficies de respuesta es posible observar grandes similitudes para el contenido total de fenoles y las dos respuestas de actividad antioxidante en semillas y vainas. Para estas variables respuestas, en ambas muestras, la temperatura fue el factor más influyente, observando un aumento significativo de 50 a 170 °C para la misma mezcla de solvente (50 % etanol) y una disminución a la temperatura intermedia (110 °C). En las cuatro superficies de respuesta se observó un efecto positivo de la mezcla etanol-agua (50 %) en semillas y vainas. Las condiciones óptimas de extracción implicaron el uso de 50% de etanol en agua como mezcla de solventes, 170 °C y 1 ciclo de extracción para semillas y 3 ciclos de extracción para vainas. Los resultados experimentales obtenidos en las condiciones óptimas coincidieron con los predichos, lo que confirma la validez de nuestro modelo. Se lograron identificar alrededor de 20 polifenoles, de los cuales en semillas predominaron las proanticianidinas y flavonoles mientras que en vainas hubo mayor proporción de ácidos fenólicos. El PLE ha demostrado ser un proceso ecológico, y útil para la extracción de polifenoles de semillas y vainas de caupi, lo cual valoriza a este cultivo regional ya que estaría brindando compuestos bioactivos con gran potencial como ingrediente en la formulación de alimentos.Fil: Avanza, María Victoria. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Nordeste. Instituto de Química Básica y Aplicada del Nordeste Argentino. Universidad Nacional del Nordeste. Facultad de Ciencias Exactas Naturales y Agrimensura. Instituto de Química Básica y Aplicada del Nordeste Argentino; Argentina. Universidad Nacional del Nordeste. Facultad de Ciencias Exactas Naturales y Agrimensura. Laboratorio de Tecnología Química; ArgentinaFil: Alvarez Rivera, Gerardo. Consejo Superior de Investigaciones Científicas. Instituto de Investigación en Ciencias de la Alimentación; EspañaFil: Mendiola, Jose. Consejo Superior de Investigaciones Científicas. Instituto de Investigación en Ciencias de la Alimentación; EspañaFil: Ibañez,Elena. Consejo Superior de Investigaciones Científicas. Instituto de Investigación en Ciencias de la Alimentación; EspañaXXI Congreso Latinoamericano y del Caribe de Ciencia y Tecnología de Alimentos y XVII Congreso Argentino de Ciencia y Tecnología de AlimentosBuenos AiresArgentinaAsociación Argentina de Tecnólogos Alimentario
Street vendors, marketers, and politics in twentieth-century Puebla, Mexico
No full textThis dissertation examines the business and political organizing of street vendors and marketers in Puebla, one of Mexico's largest cities, during the twentieth-century. Paying special attention to female sellers, who constituted a large majority of the street vending population, this work explores the challenges that they faced when they tried to sell their merchandise in the city's public areas. Established store keepers, municipal inspectors, and the police constantly sought to remove street vendors from Puebla's downtown. Street vendors responded by organizing the Popular Union of Street Vendors (UPVA) in 1973. This militant and independent organization emerged during the height of left-wing student activism.
The vendors' union played an active part in grass-roots politics in the aftermath of the 1968 uprising in Mexico City. The UPVA was organized in part by students, many of whom identified themselves as Maoists, and by female vendors. Women were tough and militant, willing to do practically anything to defend their rights to sell on the streets and care for their families. Several female vendors destroyed police cars and engaged in fights with authorities. They were also skilled negotiators and delivered speeches in front of hundreds of vendors.
Street vendors were political actors who petitioned and organized to defend their economic rights and after the 1970s, participated in a larger movement that carried out struggles for better conditions outside the structure of the Institutional Revolutionary Party (PRI). From the mid-1970s to the early 1990s, the state was relentless in its effort to destroy the vendors' union. The UPVA remained a militant, independent organization despite state violence against its members.Ph.D.Includes bibliographical references (p. 244-255)by Sandra C. Mendiola Garc�
Figure 37 in Thirteen new species of butterflies (Lepidoptera: Hesperiidae) from Texas
No full textFigure 37. Two species of Arteurotia, iNaturalist observations. a–c) A. artistella sp. n. a) 29447636 Mexico: San Luis Potosí, Aquismón, 16-Jul-2019 © Carlos G Velazco-Macias. b) 65660684 Mexico: Guanajuato, Victoria, Rancho Viejo, 8-Nov-2020 © Ma. Eugenia Mendiola González. c) 9615777 USA: Texas, Hidalgo Co, Mission, 3-Nov-2010 © upupamartin. d–e) A. tractipennis. d) 43115536 Honduras: Francisco Morazán, Santa Ana, 24- Apr-2020 © John van Dort. e) 69372846 Colombia: Sucre, San Benito Abad, 6-Sep-2017 © Jeir Ortega Galvan. Some images are color-corrected, rotated, and/or flipped. CC BY-NC 4.0 https://creativecommons.org/licenses/ by-nc/4.0/.Published as part of Zhang, Jing, Cong, Qian & Grishin, Nick V., 2023, Thirteen new species of butterflies (Lepidoptera: Hesperiidae) from Texas, pp. 1-58 in Insecta Mundi 2023 (969) on page 38, DOI: 10.5281/zenodo.771010
A comparative study on the cadmium and zinc uptake by kangkong (Ipomoea aquatica forsk.) and pechay (Brassica chinensis l.) grown in natural soil and coconut coir dust treated with cadmium sulfate or zinc sulfate
No full textAbstract onlyThe study was conducted at Ungka I, Pavia, Iloilo from May to June 2006.
The plant tissue samples were prepared at Central Philippine University and then analyzed by atomic absorption spectroscopy at the University of the Philippines Visayas. This study aimed to determine the effects of zinc and cadmium treatments on pechay and kangkong and to compare the results from the two experimental plants. It also aimed to study coir dust as a soil substitute.
Results of the study showed that pechay and kangkong can grow without showing any serious symptoms of toxicity in growing media containing toxic levels of zinc (100 ppm) and cadmium (8 ppm). The negligible insect damage observed on cadmium treated plants supports the theory that certain plants hyper-accumulate heavy metals for defense.
Data on biomass production show that coir dust can be a good substitute for soil in potted plants especially for plants that respond to high levels of organic matter like kangkong.
Data reveal a few similarities in the uptake of zinc and cadmium by pechay and kangkong. Literature identify pechay as a hyper-accumulator with the characteristic shoot > root trend in its uptake of metals. But in this study, pechay manifested this trend only in its zinc levels for plants grown in artificial medium. On the other hand, kangkong grown in soil showed the shoot > root trend.
Results contradicted cited literature about the competition of zinc and cadmium in plant uptake. Zinc levels of cadmium treated plants were relatively high implying an enhancement of zinc uptake rather than competition.
Although the shoot > root trend was not consistently observed in kangkong, data show that it can hold high levels of cadmium and especially zinc in its root even with the short growing period involved. The tolerant and hardy characteristics observed plus the high levels of the metals in its root make kangkong a potential material for rhizo-absorption.Includes bibliographical refencesMaster of Science in Agriculture major in Agronom
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Kome! Beve! Bive: Eat! Drink! Live! How Cookbooks Recreated Sefarad in the U.S. Diaspora and Inspired a Communal Identity
No full textThis project is a historical narrative of firsts in U.S. Sephardi culinary texts, both recipes and cookbooks, from 1805 to 1994 and chronicles Sephardi migration, identity, and values. By default, this text is a history of Sephardic women, as they have been the primary cooks and transmitters of Judeo-Spanish tradition. This project is also an exploration of how Judeo-Spanish and Sephardi identity have been understood, preserved, and transmitted since exile from the Iberian Peninsula in 1492. In six sequential chapters, this work examines how the production and consumption of food has intersected with constructions of gender, race, class, and national origin to negotiate and reinterpret citizenship to the American and Jewish nations. By defining Sephardi cuisine in the U.S. and outlining a canon of essential recipes, this text illuminates the link between Medieval Judeo-Spanish recipes and their recreation in the modern diaspora. Specifically, this study examines Sephardi Jewry’s relationships to the nation state and the Ashkenazi Jewish majority and the creation of a shared and cohesive pan-Sephardi identity in the U.S. Drawing on communal and academic archives, personal correspondence and diaries, oral histories and cookbook author interviews, census records, and Jewish community studies, a complex account of the Sephardi experience in the U.S. emerges, one that is both unique and also universal
La inmigración española en Berlín (2008-2013): los nuevos Gastarbeiter
No full textTesis inédita de la Universidad Complutense de Madrid, Facultad de Ciencias Políticas y Sociología, Departamento de Sociología IV (Métodos de la Investigación y Teoría de la Comunicación), leída el 01/02/2016La tesis aborda el fenómeno migratorio de los españoles que llegaron a Berlín en un periodo de tiempo concreto; el comprendido entre los años 2008- 2013. El trabajo se acota teniendo en cuenta las siguientes circunstancias: a) En primer lugar, el objeto de estudio son jóvenes españoles (y no tan jóvenes), titulados universitarios de ambos sexos que han decidido emigrar recientemente a Alemania. b) La investigación empírica se ha limitado al marco socio geográfico de la ciudad de Berlín, donde el colectivo de españoles emigrados ha ido creciendo paulatinamente en los últimos años. c) En tercer lugar, para la interpretación de los resultados se ha recurrido a la aproximación teórica de Pierre Bourdieu; en concreto, a las aportaciones de este autor referidas al espacio social y a sus transformaciones. Objeto y Objetivos de la tesis Esta investigación trata de responder a la siguiente pregunta: ¿qué trayectoria vital tiene el joven titulado español, que, en los últimos años, ha decido trasladarse para trabajar y vivir en Berlín? Para responder a esta pregunta se han tenido en cuenta diferentes circunstancias personales: familia, formación, profesiones/oficios y perspectivas de futuro. El fenómeno se aborda desde una perspectiva holística; es decir, se analizó quién es el recién llegado, cómo fue su pasado en España y cómo se desarrolla su vida personal y laboral en Berlín. La tesis se basa en un estudio empírico transdisciplinar que explora aspectos sociológicos y antropológicos que se aúnan en torno a una Sociología de las Migraciones (Sayad, A. 1999) que considera la inmigración y la emigración como los dos aspectos indisociables de un mismo fenómeno...The thesis deals with the migratory phenomenon of Spaniards who came to Berlin in a specific period of time; between the years of 2008 – 2013. The study takes into account the following circumstances: a) First, the object of study is Spanish young people (and not- so-young), university graduates of both sexes who have recently decided to emigrate to Germany. b) Secondly, the empirical research has been limited to the social and geographical context of Berlin where the group of Spanish immigrants has grown gradually in recent years. c) Thirdly, in order to interpret the results, the theoretical approach of Pierre Bourdieu has been used; specifically the contributions of this author which refer to social space and its transformations. Purpose and Objectives of the thesis: This research seeks to answer the following question: what is the trajectory of the young Spanish graduate, who, in recent years, has decided to live and work in Berlin? To answer this question consideration has been given to the different personal circumstances: family, training, professions / job and future prospects. The phenomenon is presented from a holistic perspective; i.e. there is a consideration of who the newcomer is, what their past was in Spain like and how their personal and professional life in Berlin has been developing. The thesis is based on an empirical study which explores sociological and anthropological aspects joined into one Sociology of Migration (Sayad) that considers immigration and emigration as the two inseparable aspects of the same phenomenon...Depto. de Sociología: Metodología y TeoríaFac. de Ciencias Políticas y SociologíaTRUEunpu
Safety in urban planning : a concept that is built from the community practices of the inhabitants of the La Victoria neighborhood in the town of San Cristóbal.
No full textLa siguiente investigación tiene como finalidad aportar en la construcción de un nuevo concepto
de seguridad a partir del análisis y la reflexión del Plan de Ordenamiento Territorial (POT)
propuesto por la alcaldía de Claudia López (2020-2024) y contrastar este concepto con las
experiencias de integrantes de la Biblioteca La Victoria de la localidad de San Cristóbal.Biblioteca Pública La VictoriaLicenciado en Ciencias SocialesPregradoThe purpose of the following investigation is to contribute to the construction of a new security concept based on the analysis and reflection of the Land Management Plan (POT) proposed by the mayor of Claudia López (2020-2024) and contrast this concept with the experiences of members of the La Victoria Library in the town of San Cristóbal
Phytochemical and Functional Characterization of Phenolic Compounds from Cowpea (Vigna unguiculata (L.) Walp.) Obtained by Green Extraction Technologies
No full textThis article belongs to the Special Issue Safety and Bioactivity of Agri-Food Products—Methods for Chemicals Residues Analysis and Phytochemicals Investigation.This work presents a green, downstream process, from extraction to phytochemical characterization and bioactivity testing, to obtain and evaluate the functional properties of phenolic compounds from cowpea (Vigna unguiculata (L.) Walp.) seeds and pods. Phenolic-rich extracts were obtained by pressurized liquid extraction (PLE). The main factors affecting the extraction conditions (temperature and solvent) were optimized in order to attain extracts with the highest extraction yield, antioxidant capacity, and total phenolic content. The optimal extraction conditions were 1:1 ethanol:water at 170 °C with one extraction cycle for seeds and three extraction cycles for pods. Phenolic compounds of optimal extract were analyzed by UHPLC-q-TOF-MS/MS (quadrupole-time of flight tandem MS). The obtained PLE-extracts exhibited higher phenolic content and antioxidant activity compared to conventional extraction procedures. The in vitro anti-neurodegenerative potential of extracts was measured through Acetylcholinesterase (AChE) inhibition assay. The results revealed the higher bioactivity observed in cowpea pod samples compared to seed extracts, which might be related to higher levels of quercetin and quercetin glycosides, kaempferol diglucoside, and other tetrahydroxylated flavones and flavonols identified in these samples. These results also provide an added-value benefit to the cultivation of this legume, considering the high potential of cowpea phenolic extracts as nutraceutical and functional ingredients in food formulations.This work was funded by Spanish Ministry of Research (AGL2017-89417-R). The research internship of M.V. Avanza in Spain was financed by the program Becas Externas from Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET).Peer reviewe
The Peruvian anchoveta and its upwelling ecosystem: three decades of change
No full textClupeoid fisheries, Population dynamics, Upwelling, Peru, Engraulis ringens, Livestock Production/Industries,
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