WorldWideScience

Sample records for aplicacion cafeteria central

  1. Electrochemical techniques application in corrosion problems of fossil power plants; Aplicacion de tecnicas electroquimicas en problemas de corrosion en centrales termoelectricas

    Energy Technology Data Exchange (ETDEWEB)

    Cano Castillo, Ulises; Garcia Ochoa, Esteban Miguel; Martinez Villafane, Alberto; Mariaca Rodriguez, Liboria; Malo Tamayo, Jose Maria; Uruchurtu Chavarin, Jorge [Instituto de Investigaciones Electricas, Cuernavaca (Mexico)

    1990-12-31

    Some aspects of the electrochemical techniques employed to evaluate the corrosion at low temperature in fossil power plants are commented, as well as the results obtained with the application of them in three power plants of this type. [Espanol] Se comentan algunos aspectos de tecnicas electroquimicas utilizadas para evaluar la corrosion en baja temperatura en centrales termoelectricas, asi como los resultados de la aplicacion de las mismas en tres centrales de este tipo.

  2. From Cafeteria to Cafe.

    Science.gov (United States)

    Harrington-Lueker, Donna

    1992-01-01

    If school architects, cafeteria designers, and some food service personnel have their way, the long, grey serving line characterizing most school cafeterias will go the way of meatloaf and mashed potatoes. This means booths and restaurant-like tables, school colors, brightly lit menu boards, windows overlooking courtyards, and mall-like…

  3. Cafeteria Food. Research Brief

    Science.gov (United States)

    Walker, Karen

    2005-01-01

    Currently, high school students account for 60% of food sold in cafeterias. School lunches should provide 33% of the students' energy intake, however, according to some research, it was found that it tends to only provide 19% because of the sale of "competitive" foods. Research by the U.S. Department of Agriculture found that girls ages…

  4. Summer season | Cafeteria closures

    CERN Multimedia

    2013-01-01

    Please note the following cafeteria closures over the summer season: Bldg. 54 closed from 29/07/2013 to 06/09/2013. Bldg. 13: closed from 13/07/2013 to 06/09/2013. Restaurant No. 2, table service (brasserie and restaurant): closed from 01/08/2013 to 06/09/2013. Bldg. 864: closed from 29/07/2013 to 06/09/2013. Bldg. 865: closed from 29/07/2013 to 06/09/2013.

  5. Understanding hospital cafeterias: results from cafeteria manager interviews.

    Science.gov (United States)

    Lederer, Ashley; Toner, Cassiopeia; Krepp, Erica M; Curtis, Christine J

    2014-01-01

    To describe the characteristics, nutrition-related knowledge, practices, and attitudes of staff managing cafeterias in New York City (NYC) hospitals. An in-person survey was administered over 7 months to cafeteria managers from hospitals participating in the NYC Department of Health and Mental Hygiene's Healthy Hospital Food Initiative. The survey assessed nutrition knowledge and attitudes; hospital cafeteria practices; and nutrition standards and policies. The majority of questions required a yes or no response, followed by an open-ended request for details related to the response. Other questions were multiple choice or used 5-point Likert scales to measure respondent perceptions. Seventeen cafeteria managers completed the survey. Less than a third of respondents had training in nutrition, and less than a quarter of hospitals followed nutrition standards for food offered in the cafeteria. Most respondents thought cafeterias could play a role in reducing sodium consumption, yet less than half correctly identified the largest sources of sodium in the average diet. The most commonly cited limitation to making healthy changes in the cafeteria was perceived lack of demand for healthy foods/customer support. Characteristics, nutrition knowledge, practices, and attitudes of hospital cafeteria managers vary. Communication with consumers and education of staff who lack training and experience in nutrition may be important focus areas for hospitals looking to improve their food environment.

  6. Cafeterias/Food-Service Areas.

    Science.gov (United States)

    American School & University, 2002

    2002-01-01

    Describes the design of notable school cafeterias and food service areas, including the educational context and design goals. Includes information on architects, suppliers, and cost, as well as photographs. (EV)

  7. Martingalas discretas. Aplicaciones

    Directory of Open Access Journals (Sweden)

    Miguel A. Marmolejo

    2009-12-01

    Full Text Available Debido a su amplio rango de aplicaciones, la teoría de las martingalas es parte fundamental de la probabilidad. En este artículo se presentan las nociones básicas de las martingalas discretas y se recopilan algunas de sus aplicaciones en probabilidad y análisis, dando idea de los diferentes contextos donde se usan.

  8. School Cafeteria Operations: Separating Myth from Reality

    Science.gov (United States)

    Weeks, Richard

    2011-01-01

    School officials often assume that the food service director or management company should be the one concerned with the cafeteria program's management details. But of course that's not the case. Cafeteria operations affect the school business bottom line, so they indeed fall under the purview of school business officials. Not only should school…

  9. GEMS: Nutrition Activities for the School Cafeteria.

    Science.gov (United States)

    Hix, Cathy L.

    1983-01-01

    Describes a teaching kit for use in the K-6 school cafeteria to teach about food and nutrition. The kit (consisting of a 56-page instruction booklet and 60 colorful nutrition cards) is meant to supplement nutrition education provided in the classroom by providing relevant food information at the point-of-purchase. (JN)

  10. Pathogenic bacterial contaminations in hospital cafeteria foods.

    Science.gov (United States)

    Rattanasena, Paweena; Somboonwatthanakul, Issaraporn

    2010-02-01

    This study aims to examine the pathogenic bacterial contaminations in foods sold in hospital cafeteria. A study was conducted between April and September of 2008 using cafeteria located in Mahasarakham provincial hospital, Thailand, as a study area. The cafeteria foods were evaluated for contaminations with Escherichia coli, Staphylococcus aureus, Salmonella typhimurium and Streptococcus faecalis, which have been earlier reported to cause nosocomial outbreaks. Of 33 different types of ready-to-eat foods, the majority (54.54%) were found to have bacteria >10(7) colony forming units per gram of food (cfu g(-1)), whereas 36.36% and only 9.10% of them were found to have bacteria at 10(6)-10(7) and foods were also shown to be contaminated with Escherichia coli (57.57%), followed by Streptococcus faecalis (51.51%), Staphylococcus aureus (48.48%) and Salmonella typhimurium (27.27%), respectively. In contrast, of 7 different types of freshly-made foods, the majority (71.42%) were found to have bacterial foods (42.85%), followed by Escherichia coli and Streptococcus faecalis at equal percentages (14.28%). None of the freshly-made foods were found to be contaminated with Streptococcus typhimurium. The results concluded that a number of ready-to-eat foods sold in the Mahasarakham hospital cafeteria were contaminated with several pathogenic bacteria at unacceptable levels. Healthcare authorities should be more aware that ready-to-eat cafeteria foods that are heavily contaminated with pathogenic bacteria may be harmful to healthcare workers and visitors and may result in nosocomial infections of the patients.

  11. Condiciones de tiempo en las aplicaciones Web

    OpenAIRE

    Gonzaléz, Ariel

    2005-01-01

    Las aplicaciones Web tienen características especiales que hacen que los mecanismos de ingeniería empleados sean diferentes de las aplicaciones estándares, Esto se debe a que los sitios Web han evolucionado notoriamente respecto a su complejidad, se pueden observar desde centros de información de solo lectura, hasta aplicaciones distribuidas basadas en Web. En este trabajo describimos un método para el diseño de aplicaciones Web, el cual es basado en el Lenguaje de Modelado Unificado. Los Dia...

  12. Bye Bye Cafeteria, Hello Restaurant-Style Dining.

    Science.gov (United States)

    Milshtein, Amy

    1999-01-01

    Examines how the university cafeteria is being transformed into restaurant-style dining to attract and retain sophisticated student customers. Harvard's and Seattle Pacific University's dining facilities are briefly highlighted. Concluding comments address planning tips for converting the old cafeteria into a better dining experience. (GR)

  13. Digital Photography as a Tool to Measure School Cafeteria Consumption

    Science.gov (United States)

    Swanson, Mark

    2008-01-01

    Background: Assessing actual consumption of school cafeteria meals presents challenges, given recall problems of children, the cost of direct observation, and the time constraints in the school cafeteria setting. This study assesses the use of digital photography as a technique to measure what elementary-aged students select and actually consume…

  14. Sistemas ubiquos: desarrollo y aplicaciones

    OpenAIRE

    Ramón, Hugo Dionisio; Charne, Javier; Di Cicco, Carlos; Riva, Diego Germán de la; Smail, Ana; Osella Massa, Germán Leandro

    2013-01-01

    Se presenta un proyecto de investigación aplicada al cómputo ubiquo (ubicomp), abarcando aspectos que van desde los fundamentos del desarrollo (técnicas de Ingeniería de requerimientos, metodologías de gestión, desarrollo de proyectos, técnicas de planificación, métricas, normas de calidad, redes de sensores y algoritmos inteligentes y procesamiento de señales) hasta la concepción de aplicaciones específicas orientadas a los procesos productivos de la región y el país, procesos de egobierno y...

  15. Results in energy saving obtained with the application of speed variator in fossil power stations; Resultados de ahorro de energia obtenidos con la aplicacion de variadores de velocidad en centrales termoelectricas

    Energy Technology Data Exchange (ETDEWEB)

    Merlos Rueda, Rosa Maria [Programa de Ahorro de Energia del Sector Electrico (PAESE), Mexico, D. F. (Mexico)

    1999-07-01

    Subdireccion de Generacion, y promovido por el Programa de Ahorro de Energia del sector Electrico (PAESE), con la puesta en operacion de un equipo en la bomba de condensado de la C. T. Punta Prieta II-U3. Los ahorros de energia observados resultaron substanciales, fluctuando entre el 19.4% en altas cargas (al 90%) y el 71.1% a bajas cargas (al 40%) de la unidad generadora. Dados los resultados anteriores, se decidio extender la cobertura del proyecto con la instalacion de 6 equipos mas para igual numero de Centrales Termoelectricas, ubicadas en 4 de las 5 Regiones de Generacion. Las Centrales Termoelectricas, seleccionadas para esta etapa del proyecto fueron: C. T. Felipe Carrillo Puerto U1, C.T. Lerma U4, C.T. Salamanca U1, C.T. Monterrey U6, C.T. Francisco Villa U3 y la C.T. Punta Prieta II-U1. Los equipos quedaron en operacion durante el primer trimestre de 1998, y los primeros resultados indican ahorros de energia promedio por equipo, entre el 39% y el 52%. La recuperacion de la inversion fluctua entre el 48.4% y el 87.6% en menos de dos anos de operacion, con lo cual se espera un periodo de recuperacion maximo de 3 anos. El potencial estimado de ahorro de energia, considerando la aplicacion de estos dispositivos en bombas de condensado, de agua de alimentacion (donde no se cuente con variador de velocidad), ventiladores de tiro forzado, de tiro inducido y recirculacion de gases, asi como en bombas de agua de circulacion, de las Centrales Generadoras existentes, ascienden a un total de 830,000 MW-h anuales, lo cual representa un 9.4% aproximado del consumo nacional en servicios propios.

  16. Periodic inventory system in cafeteria using linear programming

    Science.gov (United States)

    Usop, Mohd Fais; Ishak, Ruzana; Hamdan, Ahmad Ridhuan

    2017-11-01

    Inventory management is an important factor in running a business. It plays a big role of managing the stock in cafeteria. If the inventories are failed to be managed wisely, it will affect the profit of the cafeteria. Therefore, the purpose of this study is to find the solution of the inventory management in cafeteria. Most of the cafeteria in Malaysia did not manage their stock well. Therefore, this study is to propose a database system of inventory management and to develop the inventory model in cafeteria management. In this study, new database system to improve the management of the stock in a weekly basis will be provided using Linear Programming Model to get the optimal range of the inventory needed for selected categories. Data that were collected by using the Periodic Inventory System at the end of the week within three months period being analyzed by using the Food Stock-take Database. The inventory model was developed from the collected data according to the category of the inventory in the cafeteria. Results showed the effectiveness of using the Periodic Inventory System and will be very helpful to the cafeteria management in organizing the inventory. Moreover, the findings in this study can reduce the cost of operation and increased the profit.

  17. Application of six sigma to reloads design of the Laguna Verde Central with length until 17 days; Aplicacion de seis sigma para disenar recargas de la Central Laguna Verde con duracion hasta de 17 dias

    Energy Technology Data Exchange (ETDEWEB)

    Espinosa G, J.M. [Comision Federal de Electricidad, Central Laguna Verde, Subgerencia General de Operacion, Planeacion, Veracruz (Mexico)]. e-mail: mespinos@cfe.gob.mx

    2007-07-01

    The more important value in the Laguna Verde Central it is the safety. The international experience it confirms us that the more safe plants its are those more productive, this conclusion and reasoning indicate to the power station that we are in the correct road, improving the acting we will obtain that greater interest for us in the Laguna Verde Central (to increase the safety) and as added value to be able to be one of the best business for the Federal Commission of Electricity. With a future vision and commitment of high acting was integrated in an external place to all the area headquarters: (Maintenance, Planning, Operation, Parts of Reserve, Finances, Contracts, Supplies, Warehouse, design Engineering, place Engineering, engineering of systems, radiological Protection, etc.) to carry out a combined work with the unique challenge of drifting with the biggest level detail the program of a recharge and certainly to get ready to achieve their execution (all this without omitting any consideration for smaller or simpler than it seemed), looking for high quality in the works, with and bigger level of safety, with the minimum possible dose, the more reasonable cost and considering a new concept of human character, to achieve the above-mentioned without the participant personnel's stress, with the premise that a good plan and commitment of all the only one that it can bring us as result it is the success of the whole organization. (Author)

  18. Cafeteria-Style Grading in General Chemistry

    Science.gov (United States)

    Goodwin, John A.; Gilbert, Brian D.

    2001-04-01

    Self-selected individual course-grade weighting schemes allow students personal choice of course components in the general chemistry sequence at Coastal Carolina University. With the availability of a wide range of commercial and academically produced pedagogical resources, students can select materials that best suit their own learning styles, social situations, and motivation level. Our students use a signed contract to indicate their preferred grade-weighting schemes for determination of the course grade. In doing so, they choose from course components that include peer-led team learning (PLTL) in the Workshop Chemistry (WSC) model, computer-assisted instruction (CAI) using the ChemSkill Builder (CSB) software, a variety of in-class quizzes and group problem-solving exercises, written exams, and the final written exam. Minimum percentage values are required of all components except WSC and CSB, which have been completely optional graded course components at CCU since the summer of 1999. Comparison of student success in the course and content learning suggests that the improvements observed with introduction of a gamut of activities increase even more when the cafeteria-style grading is implemented.

  19. Usabilidad en aplicaciones móviles

    OpenAIRE

    Juan Gabriel Enriquez; Sandra Isabel Casas

    2014-01-01

    La usabilidad es considerada uno de los factores más importantes dentro de la calidad de un producto de software. Debido a esto es de interés poder contar con metodologías para medir la usabilidad de las aplicaciones. Los métodos de análisis de usabilidad que actualmente se utilizan, métodos clásicos, fueron desarrollados para aplicaciones de escritorio. Con la aparición, el uso masivo y el crecimiento de los dispositivos móviles, especialmente los Smartphones, la medición de usabilidad en ap...

  20. [Cafeterias service and health promotion in the school context].

    Science.gov (United States)

    García-Padilla, Francisca M; González-Rodríguez, Angustias

    2017-05-01

    To assess the Secondary Schools (IES) cafeterias of Andalusia as services to promote healthy eating among students as well as to check the adequacy of the food supply to the Law on Food Security and Spanish Nutrition, and the knowledge of this law by the school managers. Observational descriptive transversal study. IES of Andalusia's eight provinces. Cafeteria services. Stratified random sample with proportional allocation by province and size of habitat of 95 Andalusian IES with+10% error and confidence level (NC) 95.5. Implementation of the Healthy Food Promotion Guide, validated through a Delphi group, which collects information on: the food supply, the location of the food products and the advertising on healthy eating. Structured interview with a member of the management team. In 84.9% of the cafeterias a deficient healthy eating habits promotion is observed. 100% of the cafeterias offer a wide variety of non-recommended products (candy, soda, snack chips, industrial bakery) breaching the provisions of the Law on Food Safety and Nutrition. 33.68% of the interviewees claim to know the existence of this law. Andalusian IES cafeterias do not promote healthy eating. It can be affirmed that the law has had little impact during its first year. It is a priority to introduce measures in conformity with the law and with recent research in order to promote a healthy school environment. Copyright © 2016 Elsevier España, S.L.U. All rights reserved.

  1. 34 CFR 395.33 - Operation of cafeterias by blind vendors.

    Science.gov (United States)

    2010-07-01

    ... operate a cafeteria in such a manner as to provide food service at comparable cost and of comparable high... 34 Education 2 2010-07-01 2010-07-01 false Operation of cafeterias by blind vendors. 395.33... BLIND ON FEDERAL AND OTHER PROPERTY Federal Property Management § 395.33 Operation of cafeterias by...

  2. Predictive behaviors for anxiety and depression in female Wistar rats subjected to cafeteria diet and stress.

    Science.gov (United States)

    da Costa Estrela, Dieferson; da Silva, Wellington Alves Mizael; Guimarães, Abraão Tiago Batista; de Oliveira Mendes, Bruna; da Silva Castro, André Luis; da Silva Torres, Iraci Lucena; Malafaia, Guilherme

    2015-11-01

    Obesity and chronic stress have been considered important public health problems that affect millions of people worldwide. Our aim was to analyze the effect of obesity associated with chronic stress on neurobehavioral parameters in female rats, considering that the association of these syndromes can enhance the negative effects on homeostasis. The animals were distributed into standard diet (Std), standard diet+stress (Std+stress), cafeteria diet (Cafe), and cafeteria diet+stress (Cafe+stress) groups. The animals of groups Std and Std+stress were fed with rodent standard feed. Groups Cafe and Cafe+stress, additionally to the standard feed, were offered palatable and calorie-rich processed food and cola-type soft drink ad libitum. From the eighth experimental week, groups Std+stress and Cafe+stress were subjected to restraint chronic stress model (50 days). After the stress protocol, predictive anxiety (open-field and elevated plus-maze tests) and depression (forced swim) were applied. The cafeteria diet was effective in inducing obesity. The ratio locomotion in the central quadrants/total locomotion evaluated during the open field test was not indicative of anxiogenic or anxiolytic effect in the animal's behavior. However, the elevated plus maze test showed that obese and stressed animals were prone to higher anxiety levels. In addition, the obese and stressed animals display less climbing behavior than all the other groups, which can be considered an indicator of depression-like behavior. Nevertheless, it is suggested that the mechanisms involved in effects of obesity associated with chronic stress be better investigated in female rats, considering the organic complexity related to these modern illnesses. Copyright © 2015 Elsevier Inc. All rights reserved.

  3. Usabilidad en aplicaciones móviles

    Directory of Open Access Journals (Sweden)

    Juan Gabriel Enriquez

    2014-06-01

    Full Text Available La usabilidad es considerada uno de los factores más importantes dentro de la calidad de un producto de software. Debido a esto es de interés poder contar con metodologías para medir la usabilidad de las aplicaciones. Los métodos de análisis de usabilidad que actualmente se utilizan, métodos clásicos, fueron desarrollados para aplicaciones de escritorio. Con la aparición, el uso masivo y el crecimiento de los dispositivos móviles, especialmente los Smartphones, la medición de usabilidad en aplicaciones móviles se tornó un tema de investigación. Los métodos y métricas actualmente utilizados para medir usabilidad pueden no ser directamente aplicables a este tipo de productos. Los estudios de usabilidad se han efectuado sobre diferentes contextos, recientemente se empezó a considerar la usabilidad en un contexto móvil. Este trabajo examina los métodos y las métricas utilizados para medir usabilidad y pretende analizar que desafíos existen al momento de realizar pruebas de usabilidad en aplicaciones móviles, donde el contexto que cambia continuamente pasa a tener un rol preponderante.

  4. Improving the flow of customers in a hospital cafeteria.

    Science.gov (United States)

    Lopez-Soriano, E M; Matthews, M E; Norback, J P

    1981-12-01

    Customer flow through a hospital cafeteria was modeled as a queuing system for the purpose of analyzing the problems of long lines and excessive waiting by customers during lunch hours. Different policies of the hospital affecting the arrival times of customers to the cafeteria were simulated on a computer. The key factor was found to be group arrivals because of the pattern in which the hospital departments released their employees for lunch. Alternative policies were simulated, and performance with those policies in effect was measured and reported.

  5. Radiological analysis of lunch served at PINSTECH cafeteria

    International Nuclear Information System (INIS)

    Haq, E.U.; Mubarak, M.A.; Faruq, M.U.; Aziz, A.; Perveen, N.; Orfi, S.D.

    1986-06-01

    Radiometric analysis of lunch served at PINSTECH cafeteria was carried out during the period from 1976 to 1984 by NaI (TI) scintillation detector, high resolution Ge(Li) detector gamma spectrometry system and low level beta counter. K-40 and Sr-90 were the most prominent radionuclides normally detected in all the lunch samples. Other radionuclides were below the measurement limits of our counting set up. Assuming 5 days a week and 50 weeks a year it can be safely stated that intake of K-40 and Sr-90 through LUNCH taken at PINSTECH cafeteria remains well below respective ALI's of these radionuclides. (author)

  6. Serving Up Change in School Cafeterias (with Related Video)

    Science.gov (United States)

    Capalbo, Mike A.

    2011-01-01

    Today's education institution kitchens are colorful and inviting, designed with curvature and stainless steel to compete with local restaurants, offering more variety and efficiency to the demanding health-conscious "Generation Me" consumer who is short on time and big on selection. In short, campus eateries are less "cafeteria" and more "cafe."…

  7. QRLabel y Blackbird: 2 aplicaciones accesibles para Android

    OpenAIRE

    Mercade Aguila, Gisela

    2012-01-01

    El objetivo de este proyecto es el de realizar dos aplicaciones para dispositivos móviles con sistema operativo Android. Estas aplicaciones están ideadas para ser usadas por una persona invidente o con deficiencias visuales. El transcurso del desarrollo de cada aplicacion sirve para conocer y experimentar con diferentes herramientas que dispone este sistema operativo, y de este modo estudiar sus ventajas y limitaciones. Se presentan dispositivos y prototipos de dispositivos diseñados exclusiv...

  8. Metilcelulosa: sus aplicaciones farmacéuticas

    OpenAIRE

    Tapia Villanueva, Cristián; Sapag Hagar, Jaime

    1995-01-01

    El objetivo de este trabajo es señalar las propiedades más importantes de la metilcelulosa (MC) y explicar de qué manera éstas son determinadas por sus características físicas y químicas. Además, se discuten algunas de sus aplicaciones más importantes en formulaciones farmacéuticas.

  9. Desarrollo en Android para aplicaciones de realidad aumentada

    OpenAIRE

    Recio Lecuona, Francisco

    2012-01-01

    El presente proyecto tiene como finalidad realizar aplicaciones de realidad aumentada en Android. Como al desarrollar dichas aplicaciones se han reutilizado librerías existentes implementadas en C++, también se ha realizado un estudio de las alternativas para poder incluirlas en una aplicación Android.

  10. Ergonomic assessments of three Idaho National Engineering Laboratory cafeterias

    Energy Technology Data Exchange (ETDEWEB)

    Ostrom, L.T.; Romero, H.A.; Gilbert, B.G.; Wilhelmsen, C.A.

    1993-01-01

    The Idaho National Engineering Laboratory is a Department of Energy facility that performs a variety of engineering and research projects. EG G Idaho is the prime contractor for the laboratory and, as such, performs the support functions in addition to technical, research, and development functions. As a part of the EG G Idaho Industrial Hygiene Initiative, ergonomic assessments were conducted at three Idaho National Engineering Laboratory Cafeterias. The purposes of the assessments were to determine whether ergonomic problems existed in the work places and, if so, to make recommendations to improve the work place and task designs. The study showed there were ergonomic problems in all three cafeterias assessed. The primary ergonomic stresses observed included wrist and shoulder stress in the dish washing task, postural stress in the dish washing and food preparation tasks, and back stress in the food handling tasks.

  11. Ergonomic assessments of three Idaho National Engineering Laboratory cafeterias

    Energy Technology Data Exchange (ETDEWEB)

    Ostrom, L.T.; Romero, H.A.; Gilbert, B.G.; Wilhelmsen, C.A.

    1993-05-01

    The Idaho National Engineering Laboratory is a Department of Energy facility that performs a variety of engineering and research projects. EG&G Idaho is the prime contractor for the laboratory and, as such, performs the support functions in addition to technical, research, and development functions. As a part of the EG&G Idaho Industrial Hygiene Initiative, ergonomic assessments were conducted at three Idaho National Engineering Laboratory Cafeterias. The purposes of the assessments were to determine whether ergonomic problems existed in the work places and, if so, to make recommendations to improve the work place and task designs. The study showed there were ergonomic problems in all three cafeterias assessed. The primary ergonomic stresses observed included wrist and shoulder stress in the dish washing task, postural stress in the dish washing and food preparation tasks, and back stress in the food handling tasks.

  12. 137Cs uptake with cafeteria food after the Chernobyl accident

    International Nuclear Information System (INIS)

    Voigt, G.; Paretzke, H.G.

    1992-01-01

    After the Chernobyl accident, the activity concentrations of radiocesium were measured in both the meals served at the cafeteria of a research center and in the employees eating there. The time-dependent means of monthly 137Cs activities in meals and people show a similar distribution pattern with highest values between March and July 1987, i.e., only 1 y after the accident. In meals, the highest activities were found when the menu consisted of pork, milk, or milk products. The 50-y cumulative effective dose calculated from the whole-body measurements is 0.21 mSv for male and 0.15 mSv for female employees. Cafeteria food contributed only a small share to this exposure

  13. Pollution Prevention Opportunity Assessment for the SNL/NM cafeterias.

    Energy Technology Data Exchange (ETDEWEB)

    McCord, Samuel Adam

    2005-12-01

    This Pollution Prevention Opportunity Assessment (PPOA) was conducted for the two Sandia National Laboratories/New Mexico cafeteria facilities between May and August 2005. The primary purpose of this PPOA is to assess waste and resource reduction opportunities and issue Pollution Prevention (P2) recommendations for Sandia's food service facilities. This PPOA contains recommendations for energy, water and resource reduction, as well as material substitution based upon environmentally preferable purchasing. Division 3000 has requested the PPOA report as part of the Division's compliance effort to implement the Environmental Management System (EMS) per DOE Order 450.1. This report contains a summary of the information collected and analyses performed with recommended options for implementation. The SNL/NM P2 Group will work with Division 3000 and the respective cafeteria facilities to implement these options.

  14. Negative sequence relay applied to generator 1 of the Laguna Verde nuclear power plant; Aplicacion de un relevador de secuencia negativa en el generador 1 de la central de Laguna Verde

    Energy Technology Data Exchange (ETDEWEB)

    Diaz de la Serna P, Enrique [Instituto de Investigaciones Electricas, Cuernavaca (Mexico)

    1988-12-31

    The rotor of a synchronous generator can be dangerously heated in a short time by stator current unbalance, therefore it must be protected with a specific relay. This article discusses the protection and the adjustments selected for Unit 1 of the Comision Federal de Electricidad Laguna Verde Nuclear Nuclear Power Station. [Espanol] El rotor de un generador sincrono puede calentarse peligrosamente en un tiempo corto debido a desbalance de corrientes en el estator, por lo que debe protegerse con un relevador especifico. En este articulo se describen la proteccion y los ajustes seleccionados para la unidad 1, de la central nucleoelectrica Laguna Verde de la Comision Federal de Electricidad.

  15. HERE'S HOW TO DESIGN A SCHOOL CAFETERIA.

    Science.gov (United States)

    POWERS, ALICE

    A DISCUSSION IS PRESENTED OF THE FACTORS INVOLVED IN DESIGNING A SYSTEM OF "UNIT KITCHENS." REASONS FOR CHOICE OF A UNIT SYSTEM OVER A CENTRAL KITCHEN ARE GIVEN, AND A DETAILED ANALYSIS OF THE FACTORS INVOLVED IN DESIGNING AND EQUIPPING SUCH FACILITIES IS PRESENTED. THIS ARTICLE APPEARED IN THE NOVEMBER-DECEMBER 1964 ISSUE OF THE SCHOOL LUNCH…

  16. Sistema de realidad aumentada para aplicaciones Android

    OpenAIRE

    Fernández Sánchez, Natalia Mercedes

    2012-01-01

    El objetivo principal de este proyecto es la creación de un sistema de realidad aumentada para el sistema operativo Android con idea de que sea utilizado para la creación de un videojuego, pero que a su vez sea lo suficientemente versátil como para poder utilizarse en otro tipo de aplicaciones. De este objetivo principal podemos obtener los objetivos secundarios: - Conocer las características que ofrecen los teléfonos móviles y como éstas pueden ser aprovechadas para la crea...

  17. Seguridad y privacidad en aplicaciones Android

    OpenAIRE

    Piñeiro Ramos, Ismael

    2017-01-01

    Este trabajo explora las vulnerabilidades existentes en los dispositivos móviles tomando como plataforma el sistema operativo Android. Se pretende estudiar en profundidad las posibilidades de inoculación de código de mal comportamiento y el control del hardware de forma remota. La necesidad de estar permanentemente conectado a través del correo electrónico, las herramientas y aplicaciones para redes sociales, la integración de la grabadora de sonido, vídeo y cámara fotográfica en el propio di...

  18. Desenvolvimento aplicacional CRM em Modelo Cloud

    OpenAIRE

    Pinto, Joana Correia

    2017-01-01

    Trabalho de projeto de mestrado, Engenharia Informática (Sistemas de Informação) Universidade de Lisboa, Faculdade de Ciências, 2017 O presente relatório descreve o trabalho realizado no Projeto de Engenharia Informática na empresa Unipartner IT Services, que decorreu desde novembro de 2016. Este trabalho está inserido no âmbito do projeto “Desenvolvimento Aplicacional sobre Modelos Cloud”. Uma solução CRM tem como principais objetivos melhorar as relações entre as empresas e os seus clien...

  19. Multi-Criteria GIS Methodology Focused on the Location of Optimal Places for Small Hydro Power Via Hydrological and Geostatistic Aplications; Metodologia SIG Multicriterio Enfocada a la Localizacion de Enclaves Optimos para Centrales de Minihidroelectricas mediante Aplicaciones Hidrologicas y Geoestadisticas

    Energy Technology Data Exchange (ETDEWEB)

    Paz, C. de la

    2013-02-01

    The main objective of this research is the development of a location methodology for sitting optimization of small hydro power (SHP) centrals. In order of achieve this goal, a Multi-Criteria Evaluation (MCE) methodology implemented through the use of tools in a GIS environment: Spatial Analysis, Geostatistic Analysis, and Hydrology have been developed. This methodology includes two different models based on the same MCE process. The substantial difference of both models is in the input data and the tools applied to estimate the energy resource and the principal factor of the methodology (caudal or accumulated flow). The first model is generated from caudal data obtained in the study area (El Bierzo), and the second one from pluviometric data and Digital Terrain Model (DTM). Both models include viability maps with greater ability areas to locate SHP facilities. As an additional objective, the study allows contrasting the results of the two developed models to evaluate their similarity. (Author)

  20. Applications of the monitor of loose parts in the cycle 6 of the Laguna Verde Unit 2 power plant; Aplicaciones del monitor de partes sueltas en el ciclo 6 de la Unidad 2 de la central Laguna Verde

    Energy Technology Data Exchange (ETDEWEB)

    Calleros, G.; Mendez, A.; Gomez, R.A. [Comision Federal de Electricidad, Central Nucleoelectrica Laguna Verde, Veracruz (Mexico); Castillo, R.; Bravo, J.M. [ININ, A.P. 18-1027, 11801 Mexico D.F. (Mexico)]. E-mail: gcm9acpp@cfe.gob.mx

    2004-07-01

    The monitor of loose parts (Loose Parts Monitoring System) installed in the Unit 2 of the Laguna Verde Central is a tool to detect strange objects or parts loose in the system of refrigeration of the reactor that could be impacted in the walls of the recirculation knots or in the internal of the reactor. In this work two applications are shown carried out with the Monitor of Loose Parts, determining the characteristics of the stable nominal conditions, those which when changing, they are used to diagnose during the Cycle 6 of the Unit 2, failures in the components of the the recirculation circuits or to identify mechanical vibrations of the recirculation knots induced by a flow of recirculation bistable associated to operative conditions of the reactor. (Author)

  1. Baseline for food waste generation - A case study in Universiti Tun Hussein Onn Malaysia cafeterias

    Science.gov (United States)

    Alias, A. R.; Mokhlis, N. A. Mohd; Zainun, N. Y.

    2017-11-01

    Increasing population and economy status have contributed to the increasing volume of solid wastes produced in Malaysia and it creates problems on the existing solid waste management system. Ineffective waste management system was one of the issues that often discussed. The purpose of this study was to suggest the best method for managing food waste in Universiti Tun Hussein Onn Malaysia (UTHM) cafeterias. The scope of the study was to identify the type and quantity of waste generated in each cafeteria. The study area was carried out at six cafeteria in UTHM including residential college cafeteria which are Tun Dr. Ismail (TDI), Tun Fatimah (TF) and Tun Syed Nasir (TSN), G3’s cafeteria, Arked, and Dr. Munie’s cafeteria located at the Faculty of Civil and Environmental Engineering (FKAAS). In this study, food waste was quantified in unit of kilogram (kg). Results of the study showed that total food waste in selected UTHM’s cafeterias was 6197.5 kg for two months. Food waste generated in G3’s cafeteria was the highest value with 1823.5 kg among another cafeteria. This is due to strategic location for students and staff to take meals, the variety of food sold and reasonable price were major factors of generating food waste. Meanwhile, the Dr. Munie's Cafeteria located in FKAAS recorded the least total production of food waste as staffs and students take their meals at others cafeterias. Through literature review, there are list of methods on waste management were identified and composting method was suggested for food waste management in UTHM since the waste was produce in very large quantity.

  2. Analysis of the Solar Resource Information Datasets for Thermal and/or electric Generation Using a Geographical Information System. Cases of Application: Central Cafeteria - University of the Valley, Cali Municipality and Farm {sup P}ozo Verde{sup ,} Jamundi Municipality , Cauca Valley, Colombia; Analisis de las Fuentes de Informacion sobre Recurso Solar para Generacion Termica y/o Electrica Empleando un Sistema de Informacion Geografica. Casos de Aplicacion: Cafeteria Central - Universidad del Valle, Municipio de Cali y Granja {sup P}ozo Verde{sup ,} Municipio de Jamundi, Valle del Cauca, Colombia

    Energy Technology Data Exchange (ETDEWEB)

    Dominguez, J.; Manrique, P. A.; Pinedo, I.

    2009-10-12

    In this report, two examples of renewable energy assessments based on Geographical Information Systems are presented. Several case studies have been carried out in the Valley of Cauca (Colombia), and one on them has been used to size a hybrid system. The results of this particular case study are presented in a second report. The aim of this document is analysing the different sources of data that could be used in the characterization of solar energy for electricity and electricity-heat use. With this purpose, data of two areas in Valley of Cauca obtained from the Atlas of Solar Radiation of Colombia, SWERA project and SSE-NASA have been compared. The data coming from these sources has been analysed using a Geographical Information System, and the conclusions are described along with cartographic and numeric products. These reports are the result of a collaboration established between Universidad del Valle (Colombia) and CIEMAT (Spain), and have been done by the author while his staying at our center included on his PhD program.

  3. Environmental enrichment and cafeteria diet attenuate the response to chronic variable stress in rats.

    Science.gov (United States)

    Zeeni, N; Bassil, M; Fromentin, G; Chaumontet, C; Darcel, N; Tome, D; Daher, C F

    2015-02-01

    Exposure to an enriched environment (EE) or the intake of a highly palatable diet may reduce the response to chronic stress in rodents. To further explore the relationships between EE, dietary intake and stress, male Sprague-Dawley rats were fed one of two diets for 5 weeks: high carbohydrate (HC) or "cafeteria" (CAF) (Standard HC plus a choice of highly palatable cafeteria foods: chocolate, biscuits, and peanut butter). In addition, they were either housed in empty cages or cages with EE. After the first two weeks, half of the animals from each group were stressed daily using a chronic variable stress (CVS) paradigm, while the other half were kept undisturbed. Rats were sacrificed at the end of the 5-week period. The effects of stress, enrichment and dietary intake on animal adiposity, serum lipids, and stress hormones were analyzed. Results showed an increase in intra-abdominal fat associated with the CAF diet and an increase in body weight gain associated with both the CAF diet and EE. Furthermore, the increase in ACTH associated with CVS was attenuated in the presence of EE and the CAF diet independently while the stress-induced increase in corticosterone was reduced by the combination of EE and CAF feeding. The present study provides evidence that the availability of a positive environment combined to a highly palatable diet increases resilience to the effects of CVS in rats. These results highlight the important place of palatable food and supportive environments in reducing central stress responses. Copyright © 2014 Elsevier Inc. All rights reserved.

  4. Receptor GNSS multiantena para aplicaciones aeroespaciales

    OpenAIRE

    Cogo, Jorge; López La Valle, Ramón G.; Puga, Gerardo L.; Smidt, Javier A.; Díaz, Juan G.; García, Javier Gonzalo; Roncagliolo, Pedro Agustín; Muravchik, Carlos Horacio

    2013-01-01

    La determinación de la posición y velocidad del vehículo es una de las tareas críticas en las aplicaciones aeroespaciales como es el caso de aviones, satélites o cohetes. En los últimos años esta tarea se ha visto favorecida por el despliegue de los Sistemas de Navegación Global por Satélite (GNSS). Estos sistemas, utilizando como base una constelación de satélites que envían señales a la superficie terrestre, permiten que un usuario que cuente con un receptor adecuado pueda obtener esta info...

  5. Effects of environmental intervention in workplace cafeterias on vegetable consumption by male workers.

    Science.gov (United States)

    Kushida, Osamu; Murayama, Nobuko

    2014-01-01

    To assess the effects of an environmental intervention based on the transtheoretical model to increase access to nutritional information about vegetable consumption in workplace cafeterias. Nonrandomized controlled trial. Sixteen workplaces with cafeterias in Niigata, Japan, were assigned to intervention (n = 8) or comparison sites (n = 8). A total of 349 Japanese male workers aged 20-59 years, who visited the cafeterias ≥ 3 times/wk. For the intervention group, 12 types of table tents containing information on increasing vegetable consumption, based on the transtheoretical model stages and processes of change, were distributed to cafeterias for 24 weeks in 2009. Information was presented according to the sequence suggested by the stages of change. Vegetable consumption in the cafeteria and per day and stage of change were assessed using self-administered questionnaires. Differences between groups were tested using a generalized linear model adjusted for age, work environment, and position. The difference in the stage of change was not statistically significantly different (P = .05), but the intervention group (n = 181) had increased vegetable consumption in the cafeteria (+0.18 servings; P = .01) and per day (+0.32 servings; P = .01) vs the comparison group. The findings suggest a beneficial effect of providing access to nutrition information about vegetable consumption as an environmental intervention in workplace cafeterias. Copyright © 2014 Society for Nutrition Education and Behavior. Published by Elsevier Inc. All rights reserved.

  6. Effect of Coleus forskohlii extract on cafeteria diet-induced obesity in rats.

    Science.gov (United States)

    Shivaprasad, Hebbani Nagarajappa; Gopalakrishna, Sushma; Mariyanna, Bhanumathy; Thekkoot, Midhun; Reddy, Roopa; Tippeswamy, Boreddy Shivanandappa

    2014-01-01

    Obesity is a metabolic disorder that can lead to adverse metabolic effects on blood pressure, cholesterol, triglycerides and insulin resistance and also increases the risk of coronary heart disease, ischemic stroke and type 2 diabetes mellitus. This study was designed to determine the effect of Coleus forskohlii on obesity and associated metabolic changes in rats fed with cafeteria diet. The aim of this study was to evaluate antiobesogenic and metabolic benefits of C. forskohlii in cafeteria diet induced obesity rat model. RATS WERE RANDOMLY DIVIDED INTO FIVE GROUPS OF SIX ANIMALS IN EACH GROUP AND AS FOLLOWS: Normal pellet diet group; cafeteria diet group; cafeteria diet followed by 50 mg/kg/d Coleus forskohlii extract (CFE), 100 mg/kg/d CFE and 45 mg/kg/d orlistat groups, respectively. Indicators of obesity such as food intake, body weight and alteration in serum lipid profiles were studied. Feeding of cafeteria diet induced obesity in rats. Administration of CFE significantly halted increase in food intake and weight gain associated with cafeteria diet. Development of dyslipidemia was also significantly inhibited. The observed effects validate that supplementation of CFE with cafeteria diet could curb the appetite and mitigate the development of dyslipidemia.

  7. INTEGRACIÓN DE APLICACIONES EN LAS EMPRESAS

    Directory of Open Access Journals (Sweden)

    Odalys Jordán Enríquez

    2006-04-01

    Full Text Available

     

    La integración de aplicaciones es el proceso de lograr que aplicaciones independientes trabajen juntas para producir un conjunto unificado de funcionalidades. Los desarrolladores de aplicaciones siempre tienen que lograr comunicar disímiles arquitecturas de información y hacer interoperar diferentes tecnologías, incluyendo sistemas operativos, lenguajes de programación, plataformas de aplicaciones y sistemas gestores de bases de datos. Las soluciones de integración pueden tener muchas variantes y estar presentes a varios niveles. En este trabajo se abordan los desafíos de la integración, criterios a considerar al realizar la integración y cuatro tipos de integración de aplicaciones. En estos tipos de soluciones presentadas, los patrones de la solución son el enfoque, no las implementaciones.

  8. Determinação de elementos minerais e traços por ativação neutrônica, em refeições servidas no restaurante da Faculdade de Saúde Pública/USP Determination of mineral and trace elements by neutron activation analysis, in meals served at the central cafeteria of Faculty of Public Health/USP

    Directory of Open Access Journals (Sweden)

    Déborah I.T. FÁVARO

    2000-08-01

    estes elementos nos dias estudados.The objective of this research was to check the nutritional adequacy of diets served to University students related to essential elements and also to monitor for some toxic elements. Within this framework, the aim was to determine the levels of these elements in meals served at the Cafeteria of the School of Public Health at USP used by students and workers along one week. The 5 meals served along the week at the Cafeteria were analyzed separately. Three trays per meal were used to collect the food according to a duplicate portion technique. The centesimal composition of the meals was determined according to the methods suggested by AOAC. Neutron Activation Analysis was used and the concentration of the following elements was determined: Ba, Br, Ca, Ce, Cl, Co, Cr, Cs, Fe, K, Mg, Mn, Mo, Na, Rb, Sb, Sc, Se and Zn. The calculated intake obtained in the present work was compared to the daily recommended values set by RDA, WHO and Reference Man. Regarding macronutrients, the protein and lipid levels were high in some cases. The fiber content of the meals was adequate. Concerning the mineral contents of Br, Ca, Fe, Mg, Mn, Rb, Se and Zn, the intake was adequate, but for the elements K, Mo, Na, Cl and Cr, the intake was too high concerning to recommendations. For the elements Ba, Co, Cs and Sb the daily intakes were compared to the values set by Reference Man. There are no recommendations for Ce and Sc elements. A great variability was also observed in the concentrations of these elements during the period of this study.

  9. Behavioral Economic Concepts To Encourage Healthy Eating in School Cafeterias: Experiments and Lessons From College Students

    OpenAIRE

    Just, David R.; Wansink, Brian; Mancino, Lisa; Guthrie, Joanne F.

    2008-01-01

    Changing small factors that influence consumer choice may lead to healthier eating within controlled settings, such as school cafeterias. This report describes a behavioral experiment in a college cafeteria to assess the effects of various payment options and menu selection methods on food choices. The results indicate that payment options, such as cash or debit cards, can significantly affect food choices. College students using a card that prepaid only for healthful foods made more nutritio...

  10. Palatable cafeteria diet ameliorates anxiety and depression-like symptoms following an adverse early environment.

    Science.gov (United States)

    Maniam, Jayanthi; Morris, Margaret J

    2010-06-01

    Early trauma contributes to psychosocial disorders later in life. An adverse early environment induced by maternal separation (MS) is known to alter behavioural and stress responses in rats. Palatable food dampens stress responses. We investigated the influence of palatable cafeteria high-fat diet (HFD) on behavioural responses following MS or non-handling (NH), versus 15min brief separation. After littering, Sprague-Dawley rats were exposed to short separation, S15 (15min), prolonged separation, S180 (180min) daily from postnatal days 2 to 14 or were non-handled. Pups were assigned to HFD or chow at weaning. We assessed depression and anxiety-like behaviour with sucrose preference test (SPT) and elevated plus maze (EPM) respectively, and measured hypothalamic CRH and hippocampal glucocorticoid receptor (GR) expression. S180 rats showed increased anxiety-and depression-like behaviours, with increased plasma corticosterone, hypothalamic CRH, and reduced hippocampal GR expression versus S15 rats. Similar effects were observed across gender. These were normalized by provision of HFD, with greater beneficial effects in males. S15 showed no benefit of HFD. NH female rats had less adverse impacts; HFD had beneficial impact on behaviour in NH males. Thus behavioural deficits and gene expression changes induced by early life stress were ameliorated by HFD. These results highlight the important place of palatable food in reducing central stress responses supporting the therapeutic value of 'comfort food'. Crown Copyright 2009. Published by Elsevier Ltd. All rights reserved.

  11. Conceptos y Aplicaciones de la Web 2.0

    OpenAIRE

    Naval, C. (Concepción); Cruz, R.E. (Reyna Esmeralda); Lara, S. (Sonia)

    2010-01-01

    La sociedad evoluciona y con ella las formas de comunicación e interacción. Uno de los cambios que está teniendo más impacto social es probablemente el uso de la web y sus aplicaciones actuales, a lo que denominamos Web 2.0. En este capítulo desarrollamos el concepto Web 2.0 siguiendo a O'Reilly, además de algunas de sus aplicaciones. Asimismo, se verán algunos enfoques del futuro de la web y las consecuencias que trae esta nueva forma de comunicación e interacción.

  12. Aplicaciones multimedia para rehabilitación cognitiva

    OpenAIRE

    Ortega Bastida, Javier

    2016-01-01

    Diseño de aplicaciones multimedia que posibilitan la rehabilitación de los pacientes a través de aplicaciones de realidad virtual e interfaces 3D: manipulación virtual de entidades, texto predictivo y dibujo guiado sobre entrono integrado para sistema multisensor para rehabilitación e interacción de personas con discapacidad, tanto motora, como cognitiva. El sistema permite la realización de terapias utilizando distintos modos de interacción hombre-máquina, posibilitando múltiples modos de in...

  13. Using nudging and social marketing techniques to create healthy worksite cafeterias in the Netherlands: intervention development and study design

    Directory of Open Access Journals (Sweden)

    Elizabeth Velema

    2017-01-01

    Full Text Available Abstract Background The worksite cafeteria is a suitable setting for interventions focusing on changing eating behavior, because a lot of employees visit the worksite cafeteria regularly and a variety of interventions could be implemented there. The aim of this paper is to describe the intervention development and design of the evaluation of an intervention to make the purchase behavior of employees in the worksite cafeteria healthier. The developed intervention called “the worksite cafeteria 2.0” consists of a set of 19 strategies based on theory of nudging and social marketing (marketing mix. The intervention will be evaluated in a real-life setting, that is Dutch worksite cafeterias of different companies and with a number of contract catering organizations. Methods/design The study is a randomized controlled trial (RCT, with 34 Dutch worksite cafeterias randomly allocated to the 12-week intervention or to the control group. Primary outcomes are sales data of selected products groups like sandwiches, salads, snacks and bread topping. Secondary outcomes are satisfaction of employees with the cafeteria and vitality. Discussion When executed, the described RCT will provide better knowledge in the effect of the intervention “the worksite cafeteria 2.0” on the purchasing behavior of Dutch employees in worksite cafeterias. Trial registration Dutch Trial register: NTR5372 .

  14. Using nudging and social marketing techniques to create healthy worksite cafeterias in the Netherlands: intervention development and study design.

    Science.gov (United States)

    Velema, Elizabeth; Vyth, Ellis L; Steenhuis, Ingrid H M

    2017-01-11

    The worksite cafeteria is a suitable setting for interventions focusing on changing eating behavior, because a lot of employees visit the worksite cafeteria regularly and a variety of interventions could be implemented there. The aim of this paper is to describe the intervention development and design of the evaluation of an intervention to make the purchase behavior of employees in the worksite cafeteria healthier. The developed intervention called "the worksite cafeteria 2.0" consists of a set of 19 strategies based on theory of nudging and social marketing (marketing mix). The intervention will be evaluated in a real-life setting, that is Dutch worksite cafeterias of different companies and with a number of contract catering organizations. The study is a randomized controlled trial (RCT), with 34 Dutch worksite cafeterias randomly allocated to the 12-week intervention or to the control group. Primary outcomes are sales data of selected products groups like sandwiches, salads, snacks and bread topping. Secondary outcomes are satisfaction of employees with the cafeteria and vitality. When executed, the described RCT will provide better knowledge in the effect of the intervention "the worksite cafeteria 2.0" on the purchasing behavior of Dutch employees in worksite cafeterias. Dutch Trial register: NTR5372 .

  15. Antiobesity effect of Safoof Mohazzil, a polyherbal formulation, in cafeteria diet induced obesity in rats.

    Science.gov (United States)

    Gupta, Pooja; Mehla, Jogender; Gupta, Yogendra Kumar

    2012-11-01

    Obesity is reaching epidemic proportions all over the world yet it lacks adequate treatment. Most of the drugs have failed either due to ineffectiveness or adverse effects. Complementary and alternative system of medicine is being used since ancient times. However, many of them have not been tested for efficacy and safety using modern scientific methods. Therefore, the antiobesity effect of Safoof Mohazzil, a polyherbal formulation, was evaluated in cafeteria diet induced obesity in female Sprague Dawley rats. Animals weighing 100-150 g were divided into four groups (n = 8) i.e. standard pellet diet, cafeteria diet control, cafeteria diet + Safoof Mohazzil and standard pellet diet plus Safoof Mohazzil. The formulation was administered orally at a dose of 1 g/kg/day for 14 weeks. At the end of study, cafeteria diet significantly increased body weight, Lee's index, lipid profile (cholesterol and triglycerides), insulin and leptin levels as compared to standard pellet diet control group. Fourteen week treatment with Safoof Mohazzil significantly prevented the increase in body weight, Lee's index, lipid profile, insulin and leptin levels as compared to cafeteria diet control group without affecting food and water intake. Safoof Mohazzil had no adverse effect on hepatic transaminases, locomotor activity and motor coordination. The study provides evidence for antiobesity effect of Safoof Mohazzil.

  16. Obesity induced by cafeteria diet disrupts fertility in the rat by affecting multiple ovarian targets.

    Science.gov (United States)

    Bazzano, M V; Torelli, C; Pustovrh, M C; Paz, D A; Elia, E M

    2015-11-01

    Obesity constitutes a health problem of increasing worldwide prevalence. Among the health detriments caused by obesity, reproduction is disrupted. However, the mechanisms involved in this disruption are not fully understood. Animals fed a cafeteria diet constitute the model for the study of obesity that most closely reflects Western diet habits. The aims of this study were to evaluate whether a cafeteria diet affects ovarian function and to contribute to the understanding of the mechanisms involved. For that purpose, 22-day-old female Wistar rats were fed ad libitum with a standard diet (control group; n = 20) or cafeteria diet (CAF group; n = 20). The cafeteria diet induced obesity and hyperglycaemia, without altering serum triglycerides, cholesterol or C-reactive protein concentrations. This diet also altered ovarian function: the rats showed prolonged dioestrous phases, decreased serum oestradiol concentrations and increased number of antral atretic follicles. Moreover, follicular cysts were detected in the CAF group, concomitantly with a decrease in the number of anti-Müllerian hormone immunoreactive pre-antral follicles and COX-2-positive antral and pre-ovulatory follicles. The authors conclude that a cafeteria diet reduces ovarian reserve, induces the presence of follicular cysts and disturbs the ovulatory process, leading to the delayed pregnancy observed in these animals. Copyright © 2015 Reproductive Healthcare Ltd. Published by Elsevier Ltd. All rights reserved.

  17. Using nudging and social marketing techniques to create healthy worksite cafeterias in the Netherlands: intervention development and study design

    NARCIS (Netherlands)

    Velema, E.; Vyth, E.L.; Steenhuis, I.H.M.

    2017-01-01

    Background: The worksite cafeteria is a suitable setting for interventions focusing on changing eating behavior, because a lot of employees visit the worksite cafeteria regularly and a variety of interventions could be implemented there. The aim of this paper is to describe the intervention

  18. Cafeteria diet induces neuroplastic modifications in the nucleus accumbens mediated by microglia activation.

    Science.gov (United States)

    Gutiérrez-Martos, Miriam; Girard, Benoit; Mendonça-Netto, Sueli; Perroy, Julie; Valjent, Emmanuel; Maldonado, Rafael; Martin, Miquel

    2018-03-01

    High-palatable and caloric foods are widely overconsumed due to hedonic mechanisms that prevail over caloric necessities leading to overeating and overweight. The nucleus accumbens (NAc) is a key brain area modulating the reinforcing effects of palatable foods and is crucially involved in the development of eating disorders. We describe that prolonged exposure to high-caloric chocolate cafeteria diet leads to overeating and overweight in mice. NAc functionality was altered in these mice, presenting structural plasticity modifications in medium spiny neurons, increased expression of neuroinflammatory factors and activated microglia, and abnormal responses after amphetamine-induced hyperlocomotion. Chronic inactivation of microglia normalized these neurobiological and behavioural alterations exclusively in mice exposed to cafeteria diet. Our data suggest that prolonged exposure to cafeteria diet produces neuroplastic and functional changes in the NAc that can modify feeding behaviour. Microglia activation and neuroinflammation play an important role in the development of these neurobiological alterations. © 2017 Society for the Study of Addiction.

  19. Effects of Maternal Linseed Oil Supplementation on Metabolic Parameters in Cafeteria Diet-induced Obese Rats.

    Science.gov (United States)

    Benaissa, Nawel; Merzouk, Hafida; Merzouk, Sid Ahmed; Narce, Michel

    2015-04-01

    Because linseed oil may influence maternal and fetal metabolisms, we investigated its role in the modulation of lipid metabolism in cafeteria diet-induced obese rats and their offspring. Female Wistar rats were fed control or cafeteria food, which were either supplemented or not supplemented with linseed oil (5%) for 1 month before and during gestation. At parturition, serum and tissue lipids and enzyme activities were analyzed. Cafeteria diet induced adverse metabolic alterations in both mothers and offspring. Linseed oil improved metabolic status. In conclusion, linseed oil displayed health benefits by modulating tissue enzyme activities in both obese mothers and their newborns. Copyright © 2015 The Editorial Board of Biomedical and Environmental Sciences. Published by China CDC. All rights reserved.

  20. Effects of maternal linseed oil supplementation on oxidative stress markers in cafeteria diet induced obese rats

    Directory of Open Access Journals (Sweden)

    Hafida Merzouk

    2015-07-01

    Full Text Available We investigated the role of dietary linseed oil in the modulation of biochemical parameters and oxidant/antioxidant markers in cafeteria-induced obese rats and their offspring. Female wistar rats were fed on control or cafeteria diet, supplemented or not with linseed oil (5% for one month before and during the gestation. At parturition, the mothers and their offspring were killed. Weight gain, food intake, serum biochemical and oxidant/antioxidant markers were determined. Cafeteria diet induced a significant increase in body weight, food intake and adverse alterations in biochemical parameters such as an increase in serum glucose, triglyceride, cholesterol and oxidant markers. Linseed oil supplementation induced a reduction in weight gain, serum lipids and a modulation of oxidative stress, improving metabolic status. In conclusions, linseed oil displayed remarkable health benefits by decreasing plasma and oxidant/antioxidant markers in both obese mothers and their newborns.

  1. O MERCADO DE FRANQUIAS E PEQUENAS EMPRESAS: UM ESTUDO SOBRE O SEGMENTO CAFETERIA

    Directory of Open Access Journals (Sweden)

    Ernani Cesar de Freitas

    2008-01-01

    Full Text Available O presente artigo tem como objetivo identificar fatores que influenciam o empreendedor em optar por uma franquia ou por um negócio independente no ramo de cafeteria, demonstrando as possíveis vantagens e desvantagens do sistema de franchising nesse segmento. A pesquisa descritiva realizou-se através de questionários estruturados, aplicados a franqueadores e a franqueados integrantes do sistema franchising de cafeteria no Brasil. Os resultados obtidos na pesquisa demonstram que existem diversos motivos que podem influenciar o empreendedor na escolha desse tipo de negócio; existem vantagens e desvantagens que devem ser avaliadas adequadamente para subsidiar a tomada de decisão do empreendedor. Palavras-chave: Franquias. Franchising. Empreendedor. Cafeteria.

  2. Same spaces, different races: what can cafeteria seating patterns tell us about intergroup relations in middle school?

    Science.gov (United States)

    Echols, Leslie; Solomon, Brett J; Graham, Sandra

    2014-10-01

    Using 2 segregation indices--an exposure index previously used in cafeteria studies and an entropy index used for the first time, to our knowledge, in this study--we examined racial segregation in seating patterns among ethnically diverse middle school students in their school cafeteria over a 2-week period. Given the representation of groups in the cafeteria each day, results indicated the expected amount of contact between Asian and White students, but more limited contact between Asian and Latino students and between White and Latino students. Latino students, who were in the numerical majority in the sample, appeared least likely to contribute to overall segregation in the cafeteria. Implications for using the cafeteria methodology to examine intergroup relations were discussed. (PsycINFO Database Record (c) 2014 APA, all rights reserved).

  3. Availability of drinking water in US public school cafeterias.

    Science.gov (United States)

    Hood, Nancy E; Turner, Lindsey; Colabianchi, Natalie; Chaloupka, Frank J; Johnston, Lloyd D

    2014-09-01

    This study examined the availability of free drinking water during lunchtime in US public schools, as required by federal legislation beginning in the 2011-2012 school year. Data were collected by mail-back surveys in nationally representative samples of US public elementary, middle, and high schools from 2009-2010 to 2011-2012. Overall, 86.4%, 87.4%, and 89.4% of students attended elementary, middle, and high schools, respectively, that met the drinking water requirement. Most students attended schools with existing cafeteria drinking fountains and about one fourth attended schools with water dispensers. In middle and high schools, respondents were asked to indicate whether drinking fountains were clean, and whether they were aware of any water-quality problems at the school. The vast majority of middle and high school students (92.6% and 90.4%, respectively) attended schools where the respondent perceived drinking fountains to be clean or very clean. Approximately one in four middle and high school students attended a school where the survey respondent indicated that there were water-quality issues affecting drinking fountains. Although most schools have implemented the requirement to provide free drinking water at lunchtime, additional work is needed to promote implementation at all schools. School nutrition staff at the district and school levels can play an important role in ensuring that schools implement the drinking water requirement, as well as promote education and behavior-change strategies to increase student consumption of water at school. Copyright © 2014 Academy of Nutrition and Dietetics. Published by Elsevier Inc. All rights reserved.

  4. Microbiological criteria in public catering: sampling and auditing experiences in canteens and cafeterias in Piedmont

    Directory of Open Access Journals (Sweden)

    Amaranta Traversa

    2013-02-01

    Full Text Available In the period 2006-2011 six public catering establishments (3 canteens and 3 cafeterias were monitored, trough audit and sampling, in order to verify the application of good manufacturing and hygiene practices during food production, handling and serving. The compliance to microbiological food safety criteria (Listeria monocytogenes and Salmonella spp. and process hygiene criteria were investigated using ISO standards for microbiological analyses. A total of 612 samples were collected: 192 food samples and 288 environmental swab samples from canteens; 33 food samples and 99 swab samples from cafeterias. Regarding food safety, two samples were in disagreement with criteria fixed in EU Regulation as Listeria monocytogenes was isolated from a turkey breast in a canteen and from a sandwich in a cafeteria. Regarding process hygiene criteria, as no microbiological limits are legally defined for catering services, for this study limits were fixed according to the quality standards of tender, scientific literature and laboratory experience. 23.4% foodstuffs and 8.7% swabs resulted non-compliant in canteens; 48.5% foodstuffs and 6.1% swabs resulted non-compliant in cafeterias. The count of coagulase-positive staphylococci (CPS was higher of the fixed limits in raw turkey meat and in cooked spinach: the presence among CPS of S. aureus was confirmed, strains were not able to produce enterotoxins. The most common non-compliance in hygiene criteria was represented by aerobic colony count (60.7% of total non-compliance in canteens and 75.0% in cafeterias and coliform bacteria (20.3% in canteens and 25.0% in cafeterias. Nine raw foods or raw readyto- eat food samples were non-compliant for both coliform bacteria and aerobic count; one sample (raw turkey meat was non-compliant for CPS and aerobic count but resulted to be compliant after cooking. Auditing and sampling are the most effective tools to improve food quality standard and to enhance food business

  5. Market research for a business plan : a child-friendly cafeteria

    OpenAIRE

    Rundberg, Janika

    2013-01-01

    The object of this Bachelor's thesis is to see whether there is a market in Turku for a new business plan, a child-friendly cafeteria. The author has an option of starting up a company if the thesis proves that there is a market for the business. The author wanted to know if other people with children feel the same way than she does about the existing cafeteria culture, the lack of healthy food and drink options and not very child-friendly enviroments being the main problems in the market. ...

  6. The effect of price reduction on salad bar purchases at a corporate cafeteria.

    Science.gov (United States)

    Kottke, Thomas E; Pronk, Nicolaas P; Katz, Abigail S; Tillema, Juliana O; Flottemesch, Thomas J

    2013-01-01

    The objective of this study was to determine the effect of a price reduction on salad bar purchases in a corporate cafeteria. We reduced the price of salad bar purchases by 50% during March 2012 and analyzed sales data by month for February through June 2012. We also conducted an anonymous survey. Salad bar sales by weight more than tripled during the price reduction and returned to baseline afterward. Survey respondents reported that the high price of salad relative to other choices is a barrier to purchases. Policies that make the price of salads equal to other choices in cafeterias may significantly increase healthful food consumption.

  7. Deconstruction of the asbestos cement roof of the central market in Alicante difficulties in the practical application of RD 396/2006 (works with risk of exposure to asbestos); Deconstruccion de la cubierta de asbesto-cemento del Mercado Central de Abastos de Alicante. Dificultades en la aplicacion practica del RD 396/2006 (trabajos con riesgo de exposicion al amianto)

    Energy Technology Data Exchange (ETDEWEB)

    Sirvent Perez, C. D.

    2010-07-01

    The project and the works described below mainly deal with the deconstruction of the current asbestos-cement roof of the Central Market in Alicante in order to replace it with another roof of zinc diamond scales, similar to the original which was implementation in 1921 when the building went into service. These works were necessary to avoid the causes (and consequences) that generate the appearance of rainwater infiltration, as was described in an earlier report that was done in 2006, also drafted by the undersigned technicians. The article shows the difficulty of the practical application of RD 396/2006 (minimum health and safety requirements for works with risks of exposure to asbestos) in a case of a certain complexity such as this, especially in areas such as economic (rising costs), technical (increasing difficulty of implementation), and the total duration of the work (total time extension due to interference with other trades). (Author) 14 refs.

  8. Salad Maker. DOT No. 317.384-010. Cafeteria Occupations. Coordinator's Guide. First Edition.

    Science.gov (United States)

    East Texas State Univ., Commerce. Occupational Curriculum Lab.

    This study guide, one of eight individualized units developed for students enrolled in cooperative part-time training and employed in a cafeteria, is composed of information about one specific occupation; this unit focuses on the duties of the salad maker. Materials provided in this guide for coordinator use include a student progress chart; a job…

  9. Schools′ cafeteria status: Does it affect snack patterns? a qualitative study

    Directory of Open Access Journals (Sweden)

    Fatemeh Esfarjani

    2013-01-01

    Full Text Available Background: The aim of this study was to evaluate patterns of students′ snacks habits regarding to their schools′ cafeteria status in Tehran by focus group discussion (FGD technique. Methods: Participants were 240 students (12-15 years old, selected from12 middle-schools in Tehran. The field study consisted of 24 FGDs sessions; involving 8-10 participants. Collected data were coded, categorized and analyzed using constant comparative method. Results: Over half of the students believed that snack consumption is necessary. Although, majority of students believed that their schools′ cafeterias are not acceptable, they noted them as one of the necessary parts of school. Nearly half of the children were complaining of unvaried and expensive food items. The most purchased items were: Cookies, sandwiches with mayonnaise and ketchup, soft drinks and chocolate milk. Most of the students were interested in having roles in their cafeterias. Conclusions: Schools′ cafeteria are significant sources of supplying adolescents′ snacks, so developing hygienic stores containing healthy and nutritious food items is a key element to affect their snack selection positively. Reaching this goal requires a multi disciplinary approach through participation of students, school staff, parents, and the support of community and media.

  10. Reducing Disruptive Behavior in an Urban School Cafeteria: An Extension of the Good Behavior Game

    Science.gov (United States)

    McCurdy, Barry L.; Lannie, Amanda L.; Barnabas, Ernesto

    2009-01-01

    Non-classroom settings are often the most violence-prone areas within a school. This study investigated the impact of an interdependent group contingency on the disruptive behaviors of students in grades K-6 in an urban school cafeteria. Nine female noontime aides and National School and Community Corps staff members implemented the Lunchroom…

  11. The metabolic and neuroinflammatory changes induced by consuming a cafeteria diet are age-dependent.

    Science.gov (United States)

    Teixeira, Deborah; Cecconello, Ana Lucia; Partata, Wania Aparecida; de Fraga, Luciano Stürmer; Ribeiro, Maria Flávia Marques; Guedes, Renata Padilha

    2017-09-29

    To compare the effects of a palatable cafeteria diet on serum parameters and neuroinflammatory markers of young and aged female Wistar rats. Three-month-old (young) and 18-month-old (aged) female Wistar rats had access to a cafeteria diet (Caf-Young, Caf-Aged) or a standard chow diet (Std-Young, Std-Aged). The Caf-Young group showed a higher food consumption, weight gain, visceral fat depot, serum insulin and leptin levels, and the insulin resistance index (HOMA-IR) than the Std-Young group. The Caf-Aged group exhibited an increase in interleukin-1 levels in the cerebral cortex and hippocampus. The number of GFAP-positive cells did not differ between the groups, but there was a diet effect in the cerebral cortex and an age effect in the hippocampus. Phospho-tau expression did not differ between the groups. The 3- and 18-month-old rats responded differently to a cafeteria diet. Insulin and leptin levels are elevated in young animals fed a cafeteria diet, whereas aged animals are prone to neuroinflammation (indicated by an increase in interleukin-1β levels). A combination of hypercaloric diet and senescence have detrimental effects on the inflammatory response in the brain, which may predispose to neurological diseases.

  12. Consumer Support for Policies to Reduce the Sodium Content in School Cafeterias

    Science.gov (United States)

    Patel, Sheena M.; Gunn, Janelle P.; Merlo, Caitlin L.; Tong, Xin; Cogswell, Mary E.

    2014-01-01

    Purpose/Objectives: The objective of this study was to assess consumer support for policies lowering the sodium content of cafeteria foods in schools. Methods: Data were used from 9,634 adults aged >18 years who responded to questions about sodium in general and in school foods in a 2010 national mail panel survey. Prevalence of consumer…

  13. Schools' Cafeteria Status: Does it Affect Snack Patterns? A Qualitative Study.

    Science.gov (United States)

    Esfarjani, Fatemeh; Mohammadi, Fatemeh; Roustaee, Roshanak; Hajifaraji, Majid

    2013-10-01

    The aim of this study was to evaluate patterns of students' snacks habits regarding to their schools' cafeteria status in Tehran by focus group discussion (FGD) technique. Participants were 240 students (12-15 years old), selected from12 middle-schools in Tehran. The field study consisted of 24 FGDs sessions; involving 8-10 participants. Collected data were coded, categorized and analyzed using constant comparative method. Over half of the students believed that snack consumption is necessary. Although, majority of students believed that their schools' cafeterias are not acceptable, they noted them as one of the necessary parts of school. Nearly half of the children were complaining of unvaried and expensive food items. The most purchased items were: Cookies, sandwiches with mayonnaise and ketchup, soft drinks and chocolate milk. Most of the students were interested in having roles in their cafeterias. Schools' cafeteria are significant sources of supplying adolescents' snacks, so developing hygienic stores containing healthy and nutritious food items is a key element to affect their snack selection positively. Reaching this goal requires a multi disciplinary approach through participation of students, school staff, parents, and the support of community and media.

  14. The impact of educational and environmental interventions in Dutch worksite cafeterias

    NARCIS (Netherlands)

    I.H.M. Steenhuis; P. van Assema (Patricia); G.J.P. van Breukelen (Gerard); K. Glanz; G.J. Kok (Gerjo); H. de Vries (Hein)

    2004-01-01

    textabstractEnvironmental interventions as labeling of healthy foods and an increased availability of healthy foods may help consumers to meet the guidelines for a healthy diet. This article describes a study into the effectiveness of two environmental programs to be used in worksite cafeterias

  15. Cafeteria diet impairs expression of sensory-specific satiety and stimulus-outcome learning.

    Science.gov (United States)

    Reichelt, Amy C; Morris, Margaret J; Westbrook, R F

    2014-01-01

    A range of animal and human data demonstrates that excessive consumption of palatable food leads to neuroadaptive responses in brain circuits underlying reward. Unrestrained consumption of palatable food has been shown to increase the reinforcing value of food and weaken inhibitory control; however, whether it impacts upon the sensory representations of palatable solutions has not been formally tested. These experiments sought to determine whether exposure to a cafeteria diet consisting of palatable high fat foods impacts upon the ability of rats to learn about food-associated cues and the sensory properties of ingested foods. We found that rats fed a cafeteria diet for 2 weeks were impaired in the control of Pavlovian responding in accordance to the incentive value of palatable outcomes associated with auditory cues following devaluation by sensory-specific satiety. Sensory-specific satiety is one mechanism by which a diet containing different foods increases ingestion relative to one lacking variety. Hence, choosing to consume greater quantities of a range of foods may contribute to the current prevalence of obesity. We observed that rats fed a cafeteria diet for 2 weeks showed impaired sensory-specific satiety following consumption of a high calorie solution. The deficit in expression of sensory-specific satiety was also present 1 week following the withdrawal of cafeteria foods. Thus, exposure to obesogenic diets may impact upon neurocircuitry involved in motivated control of behavior.

  16. Cafeteria diet impairs expression of sensory-specific satiety and stimulus-outcome learning

    Directory of Open Access Journals (Sweden)

    Amy Claire Reichelt

    2014-08-01

    Full Text Available A range of animal and human data demonstrates that excessive consumption of palatable food leads to neuroadaptive responses in brain circuits underlying reward. Unrestrained consumption of palatable food has been shown to increase the reinforcing value of food and weaken inhibitory control; however whether it impacts upon the sensory representations of palatable solutions has not been formally tested. These experiments sought to determine whether exposure to a cafeteria diet consisting of palatable high fat foods impacts upon the ability of rats to learn about food-associated cues and the sensory properties of ingested foods. We found that rats fed a cafeteria diet for 2 weeks were impaired in the control of Pavlovian responding in accordance to the incentive value of palatable outcomes associated with auditory cues following devaluation by sensory-specific satiety. Sensory-specific satiety is one mechanism by which a diet containing different foods increases ingestion relative to one lacking variety. Hence, choosing to consume greater quantities of a range of foods may contribute to the current prevalence of obesity. We observed that rats fed a cafeteria diet for 2 weeks showed impaired sensory-specific satiety following consumption of a high calorie solution. The deficit in expression of sensory-specific satiety was also present 1 week following the withdrawal of cafeteria foods. Thus, exposure to obesogenic diets may impact upon neurocircuitry involved in motivated control of behaviour.

  17. Cafeteria diet intake for fourteen weeks can cause obesity and insulin resistance in Wistar rats

    Directory of Open Access Journals (Sweden)

    Danilo Antônio Corrêa Pinto Júnior

    2012-06-01

    Full Text Available OBJECTIVE: Obesity is a strong predictor of some kinds of diseases. High intake of high-fat foods contributes significantly to the growth of the obese population globally. The aim of this study was to verify if consumption of a cafeteria diet for fourteen weeks could increase white fat mass, body weight and skeletal muscle mass and promote insulin resistance in male Wistar rats. METHODS: Twenty animals were divided into two groups: control and obese. Both were fed standard chow and water ad libitum. Additionally, a cafeteria diet consisting of bacon, bologna sausage, sandwich cookies and soft drink was given to the obese group. RESULTS: The obese group was significantly heavier (p<0.0001 than controls from the second week until the end of the cafeteria-diet intervention. Absolute and relative fat mass, liver weight and Lee Index increased significantly (p<0.05 in the obese group. Furthermore, the obese group had lower (p<0.05 insulin sensitivity than the control group. CONCLUSION: In conclusion, fourteen weeks of cafeteria diet promoted a progressive increase of fat mass and insulin resistance. Therefore, this is a great and inexpensive diet-induced insulin resistance model.

  18. Effect of Food Service Nutrition Improvements on Elementary School Cafeteria Lunch Purchase Patterns

    Science.gov (United States)

    Cluss, Patricia A.; Fee, LuAnn; Culyba, Rebecca J.; Bhat, Kiran B.; Owen, Kay

    2014-01-01

    Background: Schools can play a major role in prevention and intervention for childhood obesity. We describe changes in elementary school cafeteria lunch sales patterns resulting from nutritional improvements in menu offerings that were part of a community-wide focus on health. Methods: Elementary school lunch sales data were collected for 1 week…

  19. Cafeteria diet impairs expression of sensory-specific satiety and stimulus-outcome learning

    Science.gov (United States)

    Reichelt, Amy C.; Morris, Margaret J.; Westbrook, R. F.

    2014-01-01

    A range of animal and human data demonstrates that excessive consumption of palatable food leads to neuroadaptive responses in brain circuits underlying reward. Unrestrained consumption of palatable food has been shown to increase the reinforcing value of food and weaken inhibitory control; however, whether it impacts upon the sensory representations of palatable solutions has not been formally tested. These experiments sought to determine whether exposure to a cafeteria diet consisting of palatable high fat foods impacts upon the ability of rats to learn about food-associated cues and the sensory properties of ingested foods. We found that rats fed a cafeteria diet for 2 weeks were impaired in the control of Pavlovian responding in accordance to the incentive value of palatable outcomes associated with auditory cues following devaluation by sensory-specific satiety. Sensory-specific satiety is one mechanism by which a diet containing different foods increases ingestion relative to one lacking variety. Hence, choosing to consume greater quantities of a range of foods may contribute to the current prevalence of obesity. We observed that rats fed a cafeteria diet for 2 weeks showed impaired sensory-specific satiety following consumption of a high calorie solution. The deficit in expression of sensory-specific satiety was also present 1 week following the withdrawal of cafeteria foods. Thus, exposure to obesogenic diets may impact upon neurocircuitry involved in motivated control of behavior. PMID:25221530

  20. Schools’ Cafeteria Status: Does it Affect Snack Patterns? A Qualitative Study

    Science.gov (United States)

    Esfarjani, Fatemeh; Mohammadi, Fatemeh; Roustaee, Roshanak; Hajifaraji, Majid

    2013-01-01

    Background: The aim of this study was to evaluate patterns of students’ snacks habits regarding to their schools’ cafeteria status in Tehran by focus group discussion (FGD) technique. Methods: Participants were 240 students (12-15 years old), selected from12 middle-schools in Tehran. The field study consisted of 24 FGDs sessions; involving 8-10 participants. Collected data were coded, categorized and analyzed using constant comparative method. Results: Over half of the students believed that snack consumption is necessary. Although, majority of students believed that their schools’ cafeterias are not acceptable, they noted them as one of the necessary parts of school. Nearly half of the children were complaining of unvaried and expensive food items. The most purchased items were: Cookies, sandwiches with mayonnaise and ketchup, soft drinks and chocolate milk. Most of the students were interested in having roles in their cafeterias. Conclusions: Schools’ cafeteria are significant sources of supplying adolescents’ snacks, so developing hygienic stores containing healthy and nutritious food items is a key element to affect their snack selection positively. Reaching this goal requires a multi disciplinary approach through participation of students, school staff, parents, and the support of community and media. PMID:24319560

  1. A foodborne outbreak of brucellosis at a police station cafeteria, Lima, Peru

    NARCIS (Netherlands)

    Román, Karina; Castillo, Rosa; Gilman, Robert H.; Calderón, Maritza; Vivar, Aldo; Céspedes, Manuel; Smits, Henk L.; Meléndez, Paolo; Gotuzzo, Eduardo; Guerra, Humberto; Maves, Ryan C.; Matthias, Michael A.; Vinetz, Joseph M.; Saito, Mayuko

    2013-01-01

    Brucella melitensis is highly infectious for humans and can be transmitted to humans in a number of epidemiological contexts. Within the context of an ongoing brucellosis surveillance project, an outbreak at a Peruvian police officer cafeteria was discovered, which led to active surveillance

  2. Core reactor simulation of the Central Laguna Verde (CLV) reactor in stationary state and an example of the application in the recharge options analysis of cycle 3; Simulacion del nucleo del reactor de la Central Laguna Verde (CLV) en estado estacionario y ejemplo de aplicacion en el analisis de alternativas de recarga del ciclo 3

    Energy Technology Data Exchange (ETDEWEB)

    Ocampo Mansilla, Hector; Francois Lacouture, Juan Luis; Blanco Lara, Jesus; Cortes Campos, Carlos Cristobal; Esquivias Montoya, Jesus; Esquivel Torres, Jose Luis; Martin del Campo Marquez, Cecilia [Instituto de Investigaciones Electricas, Cuernavaca (Mexico); Montes Tadeo, Jose Luis [Instituto Nacional de Investigaciones Nucleares (ININ), Salazar (Mexico); Sanchez Herrera, Luciano; Torres Alvarez, Carlos [Comision Federal de Electricidad (CFE), Mexico, D. F. (Mexico)

    1991-12-31

    The results are presented of a study requested by Comision Federal de Electricidad (CFE) for the analysis of Cycle 3, of Unit No. 1 of the Laguna Verde Nuclear Power Station (CLNV) and determine the burning effect impact, carried out with the starting tests and the operation of Cycles 1 and 2 on base of the cycle extension known as coastdown. The calculations were realized with the Code Package FMS for fuel managing, using the Code PRESTO-B that analyzes the reactor in detailed form in three dimensions an in stationary state. In the study the schemes of fraction of recharge proposed by General Electric (GE) were analyzed with the effect of cycle extension. The initial design value of 100 assemblies for Cycle 3, GE proposes to increase such fraction from 112 to 120 assemblies. This impacts the cost of the second recharge and the purpose of this investigation is to analyze options with higher fuel enrichment in U-235 to minimize the number of assemblies in this recharge. The analyses effected show that the designs proposed by GE do not fulfill the required energy proposed for the cycle, even using in the recharge only fuel with 3.03% of enrichment. It is proposed, likewise, the fuel enrichment up to 3.25% to satisfy the energy demand with a minimum of assemblies. [Espanol] Se presentan los resultados de un estudio solicitado por la Comision Federal de Electricidad (CFE) para analizar el ciclo 3, de la unidad 1 de la Central Laguna Verde (CLV), y determinar el impacto del efecto de quemado llevado a cabo con las pruebas de arranque y por la operacion de los ciclos 1 y 2 con base en la tecnica de alargamiento del ciclo conocida como coastdown1. Los calculos se realizaron con el paquete de codigos FMS para la administracion de combustible, usando el codigo PRESTO-B que analiza el reactor en forma detallada en tres dimensiones y en estado estacionario. Se analizaron en el estudio los esquemas de fraccion de recarga propuesta por la General Electric (GE) con el efecto de

  3. Grape-seed procyanidins prevent the cafeteria-diet-induced decrease of glucagon-like peptide-1 production

    OpenAIRE

    Pinent, M.; Ardèvol, A.; Blay, M.; Martínez, N.; González, N.

    2014-01-01

    10.1021/jf405239p Grape-seed procyanidin extract (GSPE) has been reported to improve insulin resistance in cafeteria rats. Because glucagon-like peptide-1 (GLP-1) is involved in glucose homeostasis, the preventive effects of GSPE on GLP-1 production, secretion, and elimination were evaluated in a model of diet-induced insulin resistance. Rats were fed a cafeteria diet for 12 weeks, and 25 mg of GSPE/kg of body weight was administered concomitantly. Vehicle-treated cafeteria-fed rats and c...

  4. Introducción a aplicaciones de la lingüística

    OpenAIRE

    Vega Moreno, Érika

    2015-01-01

    El curso "Introducción a aplicaciones de la lingüística recoge los materiales de clase de "Aplicaciones de la lingüística", asignatura del primer curso del grado de Lingüística y Lenguas Aplicadas, impartida por la profesora Érika Vega Moreno.

  5. Mindfulness: Conceptos generales, psicoterapia y aplicaciones clínicas.

    OpenAIRE

    Vásquez-Dextre, Edgar R.

    2016-01-01

    El objetivo de este artículo es presentar una revisión sobre el concepto de Mindfulness, su uso en la psicoterapia y sus aplicaciones clínicas. Mindfulness es una técnica de meditación que consiste en observar la realidad en el momento presente, sin intenciones de juzgar y conplena apertura y aceptación. Existen terapias que usan Mindfulness dentro de su estructura y sus programas, tales como como la Terapia Dialéctico-Conductual y la Reducción del Estrés basada en Mindfulness. Mindfulness ha...

  6. Nanosistemas avanzados para aplicaciones dermatológicas /

    OpenAIRE

    Miñana Prieto, Rafael,

    2017-01-01

    La llegada de la nanotecnología a las ciencias de la salud ha generado muchas expectativas debido a las importantes aplicaciones diagnósticas, terapéuticas y cosméticas. Uno de los grandes retos en este proceso reside en el desarrollo de «nanoterapias», dirigidas específicamente a los tejidos y órganos diana, evitando los efectos secundarios de los tratamientos actuales. Debido a su biocompatibilidad, las nanopartículas de oro (AuNPs) son unas de las nanopartículas metálicas más utilizadas en...

  7. Nanosistemas avanzados para aplicaciones dermatológicas

    OpenAIRE

    Miñana Prieto, Rafael

    2017-01-01

    La llegada de la nanotecnología a las ciencias de la salud ha generado muchas expectativas debido a las importantes aplicaciones diagnósticas, terapéuticas y cosméticas. Uno de los grandes retos en este proceso reside en el desarrollo de «nanoterapias», dirigidas específicamente a los tejidos y órganos diana, evitando los efectos secundarios de los tratamientos actuales. Debido a su biocompatibilidad, las nanopartículas de oro (AuNPs) son unas de las nanopartículas metálicas más utilizadas...

  8. Aplicaciones digitales con software libre para City Branding de Valledupar

    OpenAIRE

    Andrade Yejas, David Albeiro

    2014-01-01

    El uso de las TIC se ha masificado dentro del ámbito del turismo convirtiéndose en herramienta fundamental y un aliado para llegar a conquistar turistas para los diferentes destinos que se promocionan a través de aplicaciones moviles o de website. Cada vez más las entidades turísticas o las empresas recurren a las tecnologías de la información, en particular Internet, como medio para promocionar sus productos y servicios turísticos. Estas nuevas tecnologías han cambiado el concepto de ...

  9. Modelo de aplicaciones con procesos concurrentes y distribuidos

    OpenAIRE

    Giulianelli, Daniel Alberto; Rodríguez, Rocío Andrea; Vera, Pablo Martín

    2006-01-01

    En este paper se presenta un nuevo diagrama al cual hemos denominado DEA "Diagrama de Estados Activo". El mismo permite modelar todos los aspectos de las aplicaciones con procesos concurrentes y distribuidos. Como punto de partida se evaluaron los distintos modelos de UML 2.0 y viendo que ninguno de ellos se adaptaba por completo a las necesidades presentadas, se elabora éste modelo que toma las características de algunos diagramas de UML y agrega elementos necesarios para este tipo de aplica...

  10. Modelos de aplicaciones con procesos concurrentes y distribuidos

    OpenAIRE

    Giulianelli, Daniel Alberto; Rodríguez, Rocío Andrea; Vera, Pablo Martín

    2007-01-01

    En este paper se presenta u nuevo diagrama al cual hemos denominado DEA “Diagrama de Estados Activos”. El mismo permite modelar todos los aspectos de las aplicaciones con procesos concurrentes y distribuidos. Como punto de partida se evaluaron los distintos modelos de UML 2.0 y viendo que ninguno de ellos se adaptaba por completo a las necesidades presentadas, se elabora éste modelo que toma las características de algunos diagramas de UML y agrega elementos necesarios para este tipo de aplica...

  11. Aplicaciones de redes neuronales en economía.

    Directory of Open Access Journals (Sweden)

    Pacheco Bonrostro, J.

    1997-01-01

    Full Text Available La metodología de las Redes Neuronales Artificiales, está siendo usada con profusión, dentro del campo de la Economía, hasta tal punto que existe una publicación bimensual, que trata específicamente estas aplicaciones a los mercados financieros: Neurove$t Journal. En este trabajo, se presentan las principales líneas de investigación existentes, a continuación la que nosotros estamos siguiendo, con algunos resultados iniciales, para finalizar con las líneas a seguir y una selección bibliográfica.

  12. Grape Seed Procyanidin Extract Improves Insulin Production but Enhances Bax Protein Expression in Cafeteria-Treated Male Rats

    OpenAIRE

    Lídia Cedó; Anna Castell-Auví; Victor Pallarès; Mayte Blay; Anna Ardévol; Montserrat Pinent

    2013-01-01

    In a previous study, the administration of a grape seed procyanidin extract (GSPE) in female Wistar rats improved insulin resistance, reduced insulin production, and modulated apoptosis biomarkers in the pancreas. Considering that pharmacokinetic and pharmacodynamic parameters in females are different from these parameters in males, the aim of the present study was to evaluate the effects of GSPE on male Wistar cafeteria-induced obese rats. The results have confirmed that the cafeteria model ...

  13. Effects of food pattern change and physical exercise on cafeteria diet-induced obesity in female rats.

    Science.gov (United States)

    Goularte, Jéferson F; Ferreira, Maria B C; Sanvitto, Gilberto L

    2012-10-28

    Obesity affects a large number of people around the world and appears to be the result of changes in food intake, eating habits and physical activity levels. Changes in dietary patterns and physical exercise are therefore strongly recommended to treat obesity and its complications. The present study tested the hypothesis that obesity and metabolic changes produced by a cafeteria diet can be prevented with dietary changes and/or physical exercise. A total of fifty-six female Wistar rats underwent one of five treatments: chow diet; cafeteria diet; cafeteria diet followed by a chow diet; cafeteria diet plus exercise; cafeteria diet followed by a chow diet plus exercise. The duration of the experiment was 34 weeks. The cafeteria diet resulted in higher energy intake, weight gain, increased visceral adipose tissue and liver weight, and insulin resistance. The cafeteria diet followed by the chow diet resulted in energy intake, body weight, visceral adipose tissue and liver weight and insulin sensitivity equal to that of the controls. Exercise increased total energy intake at week 34, but produced no changes in the animals' body weight or adipose tissue mass. However, insulin sensitivity in animals subjected to exercise and the diet was similar to that of the controls. The present study found that exposure to palatable food caused obesity and insulin resistance and a diet change was sufficient to prevent cafeteria diet-induced obesity and to maintain insulin sensitivity at normal levels. In addition, exercise resulted in normal insulin sensitivity in obese rats. These results may help to develop new approaches for the treatment of obesity and type 2 diabetes mellitus.

  14. Modification of the School Cafeteria Environment Can Impact Childhood Nutrition: Results from the Wise Mind and LA Health Studies

    OpenAIRE

    Williamson, Donald A.; Han, Hongmei; Johnson, William D.; Martin, Corby K.; Newton, Robert L.

    2012-01-01

    Recent changes in nutrition standards for the National School Lunch and School Breakfast Programs assume that modification of the nutritional serving practices of school cafeterias will result in improved childhood nutrition in the school environment. The primary aim of this paper is to summarize the findings from two recent cluster randomized controlled trials (Wise Mind and LA Health) that tested the hypothesis that modification of school cafeteria environments, including changes in nutriti...

  15. Grape Seed Procyanidin Extract Improves Insulin Production but Enhances Bax Protein Expression in Cafeteria-Treated Male Rats.

    Science.gov (United States)

    Cedó, Lídia; Castell-Auví, Anna; Pallarès, Victor; Blay, Mayte; Ardévol, Anna; Pinent, Montserrat

    2013-01-01

    In a previous study, the administration of a grape seed procyanidin extract (GSPE) in female Wistar rats improved insulin resistance, reduced insulin production, and modulated apoptosis biomarkers in the pancreas. Considering that pharmacokinetic and pharmacodynamic parameters in females are different from these parameters in males, the aim of the present study was to evaluate the effects of GSPE on male Wistar cafeteria-induced obese rats. The results have confirmed that the cafeteria model is a robust model mimicking a prediabetic state, as these rats display insulin resistance, increased insulin synthesis and secretion, and increased apoptosis in the pancreas. In addition, GSPE treatment (25 mg/kg of GSPE for 21 days) in male rats improves insulin resistance and counteracts the cafeteria-induced effects on insulin synthesis. However, the administration of the extract enhances the cafeteria-induced increase in Bax protein levels, suggesting increased apoptosis. This result contradicts previous results from cafeteria-fed female rats, in which GSPE seemed to counteract the increased apoptosis induced by the cafeteria diet.

  16. Grape Seed Procyanidin Extract Improves Insulin Production but Enhances Bax Protein Expression in Cafeteria-Treated Male Rats

    Directory of Open Access Journals (Sweden)

    Lídia Cedó

    2013-01-01

    Full Text Available In a previous study, the administration of a grape seed procyanidin extract (GSPE in female Wistar rats improved insulin resistance, reduced insulin production, and modulated apoptosis biomarkers in the pancreas. Considering that pharmacokinetic and pharmacodynamic parameters in females are different from these parameters in males, the aim of the present study was to evaluate the effects of GSPE on male Wistar cafeteria-induced obese rats. The results have confirmed that the cafeteria model is a robust model mimicking a prediabetic state, as these rats display insulin resistance, increased insulin synthesis and secretion, and increased apoptosis in the pancreas. In addition, GSPE treatment (25 mg/kg of GSPE for 21 days in male rats improves insulin resistance and counteracts the cafeteria-induced effects on insulin synthesis. However, the administration of the extract enhances the cafeteria-induced increase in Bax protein levels, suggesting increased apoptosis. This result contradicts previous results from cafeteria-fed female rats, in which GSPE seemed to counteract the increased apoptosis induced by the cafeteria diet.

  17. Effect of Argyreia speciosa root extract on cafeteria diet-induced obesity in rats.

    Science.gov (United States)

    Kumar, Shiv; Alagawadi, K R; Rao, M Raghavendra

    2011-04-01

    To evaluate the antiobesity effects of the ethanolic extract of Argyreia speciosa roots in rats fed with a cafeteria diet (CD). Obesity was induced in albino rats by feeding them a CD daily for 42 days, in addition to a normal diet. Body weight and food intake was measured initially and then every week thereafter. On day 42, the serum biochemical parameters were estimated and the animals were sacrificed with an overdose of ether. The, liver and parametrial adipose tissues were removed and weighed immediately. The liver triglyceride content was estimated. The influence of the extract on the pancreatic lipase activity was also determined by measuring the rate of release of oleic acid from triolein. The body weight at two-to-six weeks and the final parametrial adipose tissue weights were significantly lowered (P cafeteria diet-induced obesity in rats.

  18. Inversores multinivel para aplicaciones de gran potencia. Estado del arte

    Directory of Open Access Journals (Sweden)

    Ivonne Yznaga Blanco

    2011-02-01

    Full Text Available Los convertidores clásicos de frecuencia construidos a partir de inversores de dos niveles como fuentesde tensión o corriente presentan una serie de inconvenientes que provocan daños a la calidad de laenergía, así como al comportamiento de los equipos eléctricos alimentados por estos, especialmentepara aplicaciones de gran potencia. El convertidor multinivel es, hasta la fecha, la mejor alternativa pararesolver estas dificultades. En el artículo se describen los principios fundamentales de operación de losprincipales tipos de convertidores multinivel y sus aplicaciones.  The classical frequency converter made up from a two level voltage or current source inverter has severalimportant drawbacks that injure the electrical system power quality and the behaviour of the electricalapparatus fed by them specially at high power applications. The multilevel converter is, up to date, thebest choice for solving these problems. This paper describe the elementary principle of operation of themain types of multilevel converters and its applications.

  19. INVERSORES MULTINIVEL PARA APLICACIONES DE GRAN POTENCIA. ESTADO DEL ARTE

    Directory of Open Access Journals (Sweden)

    Ivonne Yznaga Blanco

    2011-02-01

    Full Text Available Los convertidores clásicos de frecuencia, construidos a partir de inversores de dos niveles comofuentes de tensión o corriente, presentan una serie de inconvenientes que provocan daños a la calidadde la energía así como al comportamiento de los equipos eléctricos alimentados por los mismos,especialmente para aplicaciones de gran potencia. El convertidor multinivel es, hasta la fecha, lamejor alternativa para resolver estas dificultades. Este artículo describe los principios fundamentalesde operación de los principales tipos de convertidores multinivel y sus aplicaciones.  The classical frequency converter made up from a two level voltage or current source inverterhas several important drawbacks that injure the electrical system power quality and thebehaviour of the electrical apparatus fed by them specially at high power applications. Themultilevel converter is, up to date, the best choice for solving these problems. This paper describethe elementary principle of operation of the main types of multilevel converters and itsapplications.

  20. Effect of Coleus forskohlii extract on cafeteria diet-induced obesity in rats

    OpenAIRE

    Shivaprasad, Hebbani Nagarajappa; Gopalakrishna, Sushma; Mariyanna, Bhanumathy; Thekkoot, Midhun; Reddy, Roopa; Tippeswamy, Boreddy Shivanandappa

    2014-01-01

    Background: Obesity is a metabolic disorder that can lead to adverse metabolic effects on blood pressure, cholesterol, triglycerides and insulin resistance and also increases the risk of coronary heart disease, ischemic stroke and type 2 diabetes mellitus. This study was designed to determine the effect of Coleus forskohlii on obesity and associated metabolic changes in rats fed with cafeteria diet. Objective: The aim of this study was to evaluate antiobesogenic and metabolic benefits of C. f...

  1. Factors in the school cafeteria influencing food choices by high school students.

    Science.gov (United States)

    Shannon, Christine; Story, Mary; Fulkerson, Jayne A; French, Simone A

    2002-08-01

    This study set three objectives: 1) to examine the perceived influence of health concerns, labeling and nutrition information, taste, cost, availability, and peers on adolescents' food choices, particularly in the school cafeteria; 2) to determine whether these factors vary by gender, grade level, or adolescents' health and weight concerns; and 3) to provide recommendations regarding promotion of low-fat foods in the school cafeteria based on factors associated with food choices. Data were collected from a school survey that assessed key influences on adolescents' food choices, including low-fat foods. Some 289 students in grades 10-12 from a senior high school in a metropolitan area served as subjects. Descriptive statistics, chi-square, and general linear models were used for analysis. Results indicated that, when choosing foods from the school cafeteria, taste and getting a lot for their money were important to most students (93.7% and 71.7%, respectively). Females, and students who thought about their health and weight more frequently when deciding what to eat, were more likely to report greater interest in labeling and nutrition information and availability of low-fat foods in the school cafeteria. Findings suggest that efforts to promote low-fat foods to adolescents need to address the taste of low-fat foods, availability of low-fat options, and point-of-purchase labeling of low-fat foods. Focusing on the value and cost of low-fat foods may offer a key strategy for promoting low-fat foods to males.

  2. Schools? Cafeteria Status: Does it Affect Snack Patterns? A Qualitative Study

    OpenAIRE

    Esfarjani, Fatemeh; Mohammadi, Fatemeh; Roustaee, Roshanak; Hajifaraji, Majid

    2013-01-01

    Background: The aim of this study was to evaluate patterns of students′ snacks habits regarding to their schools′ cafeteria status in Tehran by focus group discussion (FGD) technique. Methods: Participants were 240 students (12-15 years old), selected from12 middle-schools in Tehran. The field study consisted of 24 FGDs sessions; involving 8-10 participants. Collected data were coded, categorized and analyzed using constant comparative method. Results: Over half of the students belie...

  3. Evaluación de los Frameworks en el Desarrollo de Aplicaciones Web con Python

    OpenAIRE

    Jimmy Rolando Molina Ríos; Nancy Magaly Loja Mora; Mariuxi Paola Zea Ordóñez; Erika Lizbeth Loaiza Sojos

    2016-01-01

    Debido a la creciente interacción de los usuarios con sistemas web, surge la necesidad de combinar las funcionalidades de aplicaciones clásicas de escritorio, con la accesibilidad y bajo costo de la publicación de aplicaciones web; dando origen a la elección del mejor marco de trabajo que se adopte a las necesidades de los desarrolladores. Esta investigación presenta un análisis comparativo de los frameworks que trabajan con el lenguaje Python para el desarrollo de aplicaciones web. Para ello...

  4. Sitios web y aplicaciones nativas para móviles en bibliotecas

    OpenAIRE

    Arroyo Vázquez, Natalia

    2015-01-01

    [ES]La popularidad de los dispositivos móviles, especialmente smartphones y tabletas, está llevando a las bibliotecas a adaptar sus sitios web y sus catálogos y a desarrollar aplicaciones nativas. Se analizan en este trabajo de investigación cómo son los sitios web, aplicaciones nativas y catálogos diseñados para dispositivos móviles construidos por las bibliotecas. Para ello se ha seleccionado una muestra de sitios web, aplicaciones nativas y catálogos para dispositivos móviles de biblioteca...

  5. Paying for individual health insurance through tax-sheltered cafeteria plans.

    Science.gov (United States)

    Hall, Mark A; Monahan, Amy B

    2010-01-01

    When employees without group health insurance buy individual coverage, they do so using after-tax income--costing them from 20% to 50% more than others pay for equivalent coverage. Prior to the passage of the Patient Protection and Affordable Care Act (PPACA), several states promoted a potential solution that would allow employees to buy individual insurance through tax-sheltered payroll deduction. This technical but creative approach would allow insurers to combine what is known as "list-billing" with a Section 125 "cafeteria plan." However, these state-level reform attempts have failed to gain significant traction because state small-group reform laws and federal restrictions on medical underwriting cloud the legality of tax-sheltered list-billing. Several authorities have taken the position that insurance paid for through a cafeteria plan must meet the nondiscrimination requirements of the Health Insurance Portability and Accountability Act with respect to eligibility, premiums, and benefits. The recently enacted Patient Protection and Affordable Care Act addresses some of the legal uncertainty in this area, but much remains. For health reform to have its greatest effect, federal regulators must clarify whether individual health insurance can be purchased on a pre-tax basis through a cafeteria plan.

  6. A healthful options food station can improve satisfaction and generate gross profit in a worksite cafeteria.

    Science.gov (United States)

    Kimathi, Amber N; Gregoire, Mary B; Dowling, Rebecca A; Stone, Marcelle K

    2009-05-01

    The objectives of this study were to determine customer satisfaction with a healthful options food station offered in a worksite cafeteria and document the financial contribution of such a station. The healthful options station featured daily entrées with fewer than 500 calories and less than 30% of calories from fat. Questionnaires from 655 (24.5% response) employees and students provided data on satisfaction with and usage of the station. The majority of the respondents who had purchased from the healthful options station were female (77.3%), white (51.6%), aged 30 to 50 years (52.0%), and had annual incomes of $60,000 to $100,000 (29.3%) or $20,000 to $39,999 (22.2%). Sales and gross profit from the healthful options station were compared to those of the comfort station. Customers were satisfied with attributes of the healthful options station (means >3 on a 5-point scale). Results of paired t tests suggested that customers who had purchased from the healthful options station rated the station significantly (Pfood presentation, food quality, overall quality of the cafeteria, length of line, and food choices available compared to their ratings for the cafeteria in general. The healthful options station generated average daily sales of $458 and gross profit of $306. However, the sales and gross profit were significantly (P<0.05) less than the comparison comfort station.

  7. Chocolate milk consequences: a pilot study evaluating the consequences of banning chocolate milk in school cafeterias.

    Directory of Open Access Journals (Sweden)

    Andrew S Hanks

    Full Text Available OBJECTIVES: Currently, 68.3% of the milk available in schools is flavored, with chocolate being the most popular (61.6% of all milk. If chocolate milk is removed from a school cafeteria, what will happen to overall milk selection and consumption? METHODS: In a before-after study in 11 Oregon elementary schools, flavored milk-which will be referred to as chocolate milk-was banned from the cafeteria. Milk sales, school enrollment, and data for daily participation in the National School Lunch Program (NSLP were compared year to date. RESULTS: Total daily milk sales declined by 9.9% (p<0.01. Although white milk increased by 161.2 cartons per day (p<0.001, 29.4% of this milk was thrown away. Eliminating chocolate milk was also associated with 6.8% fewer students eating school lunches, and although other factors were also involved, this is consistent with the notion of psychological reactance. CONCLUSIONS: Removing chocolate milk from school cafeterias may reduce calorie and sugar consumption, but it may also lead students to take less milk overall, drink less (waste more of the white milk they do take, and no longer purchase school lunch. Food service managers need to carefully weigh the costs and benefits of eliminating chocolate milk and should consider alternative options that make white milk more convenient, attractive, and normal to choose.

  8. Reduced Cerebrovascular Reactivity and Increased Resting Cerebral Perfusion in Rats Exposed to a Cafeteria Diet.

    Science.gov (United States)

    Gomez-Smith, Mariana; Janik, Rafal; Adams, Conner; Lake, Evelyn M; Thomason, Lynsie A M; Jeffers, Matthew S; Stefanovic, Bojana; Corbett, Dale

    2018-02-10

    To better understand the effects of a diet high in fat, sugar, and sodium on cerebrovascular function, Sprague Dawley rats were chronically exposed to a Cafeteria diet. Resting cerebral perfusion and cerebrovascular reactivity was quantified using continuous arterial spin labeling (CASL) magnetic resonance imaging (MRI). In addition, structural changes to the cerebrovasculature and susceptibility to ischemic lesion were examined. Compared to control animals fed standard chow (SD), Cafeteria diet (CAF) rats exhibited increased resting brain perfusion in the hippocampus and reduced cerebrovascular reactivity in response to 10% inspired CO 2 challenges in both the hippocampus and the neocortex. CAF rats switched to chow for one month (SWT) exhibited improved resting perfusion in the hippocampus as well as improved cerebrovascular reactivity in the neocortex. However, the diet switch did not correct cerebrovascular reactivity in the hippocampus. These changes were not accompanied by alterations in the structural integrity of the cerebral microvasculature, examined using rat endothelial cell antigen-1 (RECA-1) and immunoglobulin G (IgG) immunostaining. Also, the extent of tissue damage induced by endothelin-1 injection into sensorimotor cortex was not affected by the Cafeteria diet. These results demonstrate that short-term consumption of an ultra-processed diet reduces cerebrovascular reactivity. This effect persists after dietary normalization despite recovery of peripheral symptomatology. Copyright © 2017 IBRO. Published by Elsevier Ltd. All rights reserved.

  9. Chocolate milk consequences: a pilot study evaluating the consequences of banning chocolate milk in school cafeterias.

    Science.gov (United States)

    Hanks, Andrew S; Just, David R; Wansink, Brian

    2014-01-01

    Currently, 68.3% of the milk available in schools is flavored, with chocolate being the most popular (61.6% of all milk). If chocolate milk is removed from a school cafeteria, what will happen to overall milk selection and consumption? In a before-after study in 11 Oregon elementary schools, flavored milk-which will be referred to as chocolate milk-was banned from the cafeteria. Milk sales, school enrollment, and data for daily participation in the National School Lunch Program (NSLP) were compared year to date. Total daily milk sales declined by 9.9% (pschool lunches, and although other factors were also involved, this is consistent with the notion of psychological reactance. Removing chocolate milk from school cafeterias may reduce calorie and sugar consumption, but it may also lead students to take less milk overall, drink less (waste more) of the white milk they do take, and no longer purchase school lunch. Food service managers need to carefully weigh the costs and benefits of eliminating chocolate milk and should consider alternative options that make white milk more convenient, attractive, and normal to choose.

  10. β3-adrenoceptor agonist prevents alterations of muscle diacylglycerol and adipose tissue phospholipids induced by a cafeteria diet

    Directory of Open Access Journals (Sweden)

    Darimont Christian

    2004-08-01

    Full Text Available Abstract Background Insulin resistance induced by a high fat diet has been associated with alterations in lipid content and composition in skeletal muscle and adipose tissue. Administration of β3-adrenoceptor (β3-AR agonists was recently reported to prevent insulin resistance induced by a high fat diet, such as the cafeteria diet. The objective of the present study was to determine whether a selective β3-AR agonist (ZD7114 could prevent alterations of the lipid profile of skeletal muscle and adipose tissue lipids induced by a cafeteria diet. Methods Male Sprague-Dawley rats fed a cafeteria diet were treated orally with either the β3-AR agonist ZD7114 (1 mg/kg per day or the vehicle for 60 days. Rats fed a chow diet were used as a reference group. In addition to the determination of body weight and insulin plasma level, lipid content and fatty acid composition in gastronemius and in epididymal adipose tissue were measured by gas-liquid chromatography, at the end of the study. Results In addition to higher body weights and plasma insulin concentrations, rats fed a cafeteria diet had greater triacylglycerol (TAG and diacylglycerol (DAG accumulation in skeletal muscle, contrary to animals fed a chow diet. As expected, ZD7114 treatment prevented the excessive weight gain and hyperinsulinemia induced by the cafeteria diet. Furthermore, in ZD7114 treated rats, intramyocellular DAG levels were lower and the proportion of polyunsaturated fatty acids, particularly arachidonic acid, in adipose tissue phospholipids was higher than in animals fed a cafeteria diet. Conclusions These results show that activation of the β3-AR was able to prevent lipid alterations in muscle and adipose tissue associated with insulin resistance induced by the cafeteria diet. These changes in intramyocellular DAG levels and adipose tissue PL composition may contribute to the improved insulin sensitivity associated with β3-AR activation.

  11. Asignatura optativa “Aplicaciones del Formato MARC21”

    Directory of Open Access Journals (Sweden)

    Paola Pico

    2013-12-01

    Full Text Available Se presenta la experiencia del curso Aplicaciones de Formato MARC21 dictado por primera vez en la Escuela Universitaria de Bibliotecología y Ciencias Afines como materia optativa dirigida a los estudiantes de cuarto año de la Licenciatura en Bibliotecología. Se describe la metodología  y el enfoque utilizado durante el curso. Se presentan  los resultados de la evaluación del curso y las observaciones del software utilizado. Se concluye en la necesidad de adecuar el curso de acuerdo a las observaciones realizadas por los estudiantes y en el desarrollo de un software que reúna las características necesarias para los requerimientos del curso.

  12. Electrodos modificados y sus aplicaciones en electrocatálisis

    OpenAIRE

    Völker, Edgar

    2013-01-01

    La investigación básica y aplicada en electrodos funcionalizados ha ido incrementándose en los últimos 30 años debido a su diversidad de aplicaciones en catálisis, óptica, electrónica, protección contra la corrosión, etc. Existen diversas maneras en las cuales se puede modificar un electrodo, ya sea por deposición de películas por spin o dip coating, adsorción de monocapas autoensambladas, drop casting, autoensamblado capa‐por‐capa, etc. En esta tesis estudiamos la modificación química contro...

  13. Aplicaciones del Just-In-Time en la Argentina

    OpenAIRE

    Enrique Yacuzzi; Carolina Fajntich; María Pía Romeo

    2013-01-01

    Este trabajo presenta el concepto de JIT (Just-In-Time, o justo a tiempo) y ofrece aplicaciones en la Argentina. En la Parte I, pone el JIT en el contexto de la gestión japonesa (management japonés): destaca las características de esta gestión, y resume su evolución a lo largo de las últimas décadas. Hace hincapié en la gestión de la producción y analiza los desafíos, críticas y las teorías de la convergencia con los sistemas occidentales que se han examinado a lo largo de los últimos 20 años...

  14. Uso de las TIC en el Trastorno de Espectro Autista: aplicaciones

    Directory of Open Access Journals (Sweden)

    Susana García Guillén

    2016-11-01

    Full Text Available A través de este trabajo de investigación se ha realizado una revisión bibliográfica detallada sobre el uso de las aplicaciones y el autismo. En primer lugar se ha realizado un recorrido histórico a través del concepto autismo y las aplicaciones disponibles. Los objetivos generales han sido conocer la evolución del término autismo, conocer la bibliografía relacionada con el autismo y el uso de aplicaciones, así como las aplicaciones disponibles para niños autistas. A través de las dos bases de datos, dialnet y google aplicaciones, se presenta la revisión sistemática realizada. Como resultado, se han seleccionado cuatro artículos a través de la base de datos dialnet y treinta y cinco aplicaciones. Las Tecnologías de la Información y Comunicación (TIC ofrecen a los usuarios diferentes beneficios como la estimulación de los sentidos y el desarrollo de habilidades que le ayuden a la integración, mejorando sus habilidades sociales para lograr una mejor relación con sus iguales.

  15. Management of Sodium-reduced Meals at Worksite Cafeterias: Perceptions, Practices, Barriers, and Needs among Food Service Personnel.

    Science.gov (United States)

    Lee, Jounghee; Park, Sohyun

    2016-04-01

    The sodium content of meals provided at worksite cafeterias is greater than the sodium content of restaurant meals and home meals. The objective of this study was to assess the relationships between sodium-reduction practices, barriers, and perceptions among food service personnel. We implemented a cross-sectional study by collecting data on perceptions, practices, barriers, and needs regarding sodium-reduced meals at 17 worksite cafeterias in South Korea. We implemented Chi-square tests and analysis of variance for statistical analysis. For post hoc testing, we used Bonferroni tests; when variances were unequal, we used Dunnett T3 tests. This study involved 104 individuals employed at the worksite cafeterias, comprised of 35 men and 69 women. Most of the participants had relatively high levels of perception regarding the importance of sodium reduction (very important, 51.0%; moderately important, 27.9%). Sodium reduction practices were higher, but perceived barriers appeared to be lower in participants with high-level perception of sodium-reduced meal provision. The results of the needs assessment revealed that the participants wanted to have more active education programs targeting the general population. The biggest barriers to providing sodium-reduced meals were use of processed foods and limited methods of sodium-reduced cooking in worksite cafeterias. To make the provision of sodium-reduced meals at worksite cafeterias more successful and sustainable, we suggest implementing more active education programs targeting the general population, developing sodium-reduced cooking methods, and developing sodium-reduced processed foods.

  16. Modification of the school cafeteria environment can impact childhood nutrition. Results from the Wise Mind and LA Health studies.

    Science.gov (United States)

    Williamson, Donald A; Han, Hongmei; Johnson, William D; Martin, Corby K; Newton, Robert L

    2013-02-01

    Recent changes in nutrition standards for the National School Lunch and School Breakfast Programs assume that modification of the nutritional serving practices of school cafeterias will result in improved childhood nutrition in the school environment. The primary aim of this paper is to summarize the findings from two recent cluster randomized controlled trials (Wise Mind and LA Health) that tested the hypothesis that modification of school cafeteria environments, including changes in nutrition standards, would yield beneficial changes in childhood nutrition and healthy eating in the school lunch environment. A secondary aim was to investigate the association of participant characteristics and changes in nutrition and healthy eating. A third aim was to investigate the relationships between the food intake of children and: (1) foods selected by the children and (2) food that was uneaten during the lunch meal (plate waste). The studies used similar approaches for modifying the school cafeteria environment and both studies used the digital photography method to measure changes in food intake, food selection, and plate waste. Both studies reported significant improvements in childhood nutrition, and the LA Health study reported improved healthy eating, following introduction of the cafeteria modification program in comparison to baseline and/or control arms. These studies confirm the hypothesis that interventions that modify the school cafeteria environment can beneficially impact childhood nutrition. Copyright © 2012 Elsevier Ltd. All rights reserved.

  17. Modification of the School Cafeteria Environment Can Impact Childhood Nutrition: Results from the Wise Mind and LA Health Studies

    Science.gov (United States)

    Williamson, Donald A.; Han, Hongmei; Johnson, William D.; Martin, Corby K.; Newton, Robert L.

    2014-01-01

    Recent changes in nutrition standards for the National School Lunch and School Breakfast Programs assume that modification of the nutritional serving practices of school cafeterias will result in improved childhood nutrition in the school environment. The primary aim of this paper is to summarize the findings from two recent cluster randomized controlled trials (Wise Mind and LA Health) that tested the hypothesis that modification of school cafeteria environments, including changes in nutrition standards, would yield beneficial changes in childhood nutrition and healthy eating in the school lunch environment. A secondary aim was to investigate the association of participant characteristics and changes in nutrition and healthy eating. A third aim was to investigate the relationships between the food intake of children and: 1) foods selected by the children and 2) food that was uneaten during the lunch meal (plate waste). The studies used similar approaches for modifying the school cafeteria environment and both studies used the digital photography method to measure changes in food intake, food selection, and plate waste. Both studies reported significant improvements in childhood nutrition, and the LA Health study reported improved healthy eating, following introduction of the cafeteria modification program in comparison to baseline and/or control arms. These studies confirm the hypothesis that interventions that modify the school cafeteria environment can beneficially impact childhood nutrition. PMID:23154216

  18. Grape-seed procyanidins prevent the cafeteria-diet-induced decrease of glucagon-like peptide-1 production.

    Science.gov (United States)

    González-Abuín, Noemi; Martínez-Micaelo, Neus; Blay, Mayte; Ardévol, Anna; Pinent, Montserrat

    2014-02-05

    Grape-seed procyanidin extract (GSPE) has been reported to improve insulin resistance in cafeteria rats. Because glucagon-like peptide-1 (GLP-1) is involved in glucose homeostasis, the preventive effects of GSPE on GLP-1 production, secretion, and elimination were evaluated in a model of diet-induced insulin resistance. Rats were fed a cafeteria diet for 12 weeks, and 25 mg of GSPE/kg of body weight was administered concomitantly. Vehicle-treated cafeteria-fed rats and chow-fed rats were used as controls. The cafeteria diet decreased active GLP-1 plasma levels, which is attributed to a decreased intestinal GLP-1 production, linked to reduced colonic enteroendocrine cell populations. Such effects were prevented by GSPE. In the same context, GSPE avoided the decrease on intestinal dipeptidyl-peptidase 4 (DPP4) activity and modulated the gene expression of GLP-1 and its receptor in the hypothalamus. In conclusion, the preventive treatment with GSPE abrogates the effects of the cafeteria diet on intestinal GLP-1 production and DPP4 activity.

  19. Effects of an Intermittent Grape-Seed Proanthocyanidin (GSPE Treatment on a Cafeteria Diet Obesogenic Challenge in Rats

    Directory of Open Access Journals (Sweden)

    Iris Ginés

    2018-03-01

    Full Text Available Obesity is highly associated with the pathologies included in the concept of the Metabolic Syndrome. Grape-seed proanthocyanins (GSPE have showed very positive effects against all these metabolic disruptions; however, there is, as yet, no consensus about their effectiveness against an obesogenic challenge, such as a cafeteria diet. We determined the effectiveness of a dose of 500 mg GSPE/kg b.w. (body weight against the obesogenic effects of a 17-week cafeteria diet, administered as a sub-chronic treatment, 10–15 days before, intermittently and at the end of the diet, in Wistar rats. Body weight, adiposity, indirect calorimetry and plasma parameters were analyzed. GSPE pre-treatment showed a long-lasting effect on body weight and adiposity that was maintained for seven weeks after the last dose. A corrective treatment was administered for the last two weeks of the cafeteria diet intervention; however, it did not effectively correct any of the parameters assessed. The most effective treatment was an intermittent GSPE dosage, administered every second week during the cafeteria diet. This limited body weight gain, adiposity and most lipotoxic effects. Our results support the administration of this GSPE dose, keeping an intermittent interval between dosages longer than every second week, to improve obesogenic disruptions produced by a cafeteria diet.

  20. Go Slow Whoa meal patterns: cafeteria staff and teacher perceptions of effectiveness in winning with wellness schools.

    Science.gov (United States)

    Slawson, Deborah L; Southerland, Jodi; Lowe, Elizabeth F; Dalton, William T; Pfortmiller, Deborah T; Schetzina, Karen

    2013-07-01

    School-based interventions hold promise for child obesity prevention. Implemented as a part of the Winning With Wellness obesity prevention project, the "Go Slow Whoa" meal pattern (GSW) was designed to promote healthier foods in school cafeterias. This investigation determined perceived program effectiveness and impact on student's food purchases. A mixed method design was used, including focus groups with cafeteria staff (CS), quantitative analysis of CS and teacher surveys, and pre-post analysis of cafeteria sales. A total of 37 CS and 131 teachers from 7 schools in northeast Tennessee participated. CS recognized the important role of school nutrition services in influencing student choices, yet perceived lack of administrative support for cafeteria-based interventions and minimal interaction with teachers were barriers. CS also believed that students choose less nutritious options due to family influence. Cafeteria sales indicated that changes were made in menu planning and production, yet students' choices improved minimally. Teachers expressed moderate levels of confidence in GSW as influential in children's dietary habits. Successful implementation of school-based nutrition programs requires supportive policies, administrators, and teachers. CS should be included in program implementation efforts and the role of school nutrition services should be maximized. © 2013, American School Health Association.

  1. Experiencias y prototipos de aplicaciones de TV Digital interactivas

    Directory of Open Access Journals (Sweden)

    Fernanda Daniela Oyarzo

    2014-06-01

    Full Text Available La TV Digital es una tecnología, que va a transformar la experiencia de ver televisión. Imagen y sonido en alta definición junto con la interactividad son posibles gracias al pasaje de la transmisión analógica a la digital, la cual permite enviar datos, video, audio, aplicaciones, etc. a través de los canales de transmisión. Estas señales digitales son más eficientes que las analógicas y tienen como principal ventaja la posibilidad de enviar servicios a través del mismo canal, permitiendo un uso eficiente del espectro de transmisiones. Emergen nuevas posibilidades para el desarrollo de software, puesto que una aplicación interactiva de TV Digital es un software, específicamente una aplicación multimedia a través de la cual el televidente puede interactuar vía control remoto. Esto significa que el televidente también puede recibir video/audio, software que posibilitan que interactúe con el contenido vinculado. En estos nuevos escenarios resulta necesario llevar adelante experiencias de desarrollo de aplicaciones interactivas para TV Digital. Poner en práctica procesos, estrategias y herramientas, y su consecuente análisis promete arribar a propuestas razonables. En este sentido, este trabajo condensa las experiencias en el desarrollo de prototipos realizados en el Laboratorio de TV Digital de la UNPA que se iniciaron en el año 2011.

  2. [Effects of a long-term intervention in a work cafeteria on employee vegetable intake].

    Science.gov (United States)

    Misawa, Akemi; Yoshita, Katsushi; Fukumura, Tomoe; Tanaka, Taichiro; Tamaki, Junko; Takebayashi, Toru; Kusaka, Yukinori; Nakagawa, Hideaki; Yamato, Hiroshi; Okayama, Akira; Miura, Katsuyuki; Okamura, Tomonori; Ueshima, Hirotsugu

    2015-01-01

    We examined the effects on employee vegetable intake of a long-term intervention in an employee work cafeteria. The subjects were approximately 1,200 employees (aged 19-61 years) of an industrial company in Fukui prefecture. We promoted the intake of typical Japanese style meals that combined three elements (staple foods, main dishes and vegetable dishes) to increase vegetables intake. We displayed all items on the menus of the employee cafeteria using three colors (yellow, red and green to denote three elements) to indicate healthy food choices for the maintenance of a healthy food environment. We advised employees to choose meals containing the three elements at the time of payment, for nutritional education (appropriate portion choice: APC). We evaluated the ratio of APC at the same time. To calculate the mean daily intake per person, we carried out a questionnaire survey similar to the "semi-quantitative food frequency questionnaire" and asked about the frequency and approximate intake of vegetables. The APC was 63.5% after one year of intervention, significantly increased to 82.1% after two years (p breakfast (p < 0.001), lunch (p < 0.001) and dinner (p = 0.011), and from vegetable juice (p = 0.030) significantly increased after three years of intervention. The consumption of pickles significantly decreased after three years of intervention (p = 0.009). It was estimated that the vegetable intake of men increased from 167.3 to 184.6 g, and that of women from 157.9 to 187.7 g. Employee estimated vegetable intake was significantly increased and that of pickles was significantly decreased by a long-term intervention (three years) in the employee work cafeteria.

  3. The addition of whole soy flour to cafeteria diet reduces metabolic risk markers in wistar rats.

    Science.gov (United States)

    Andrade, Gláucia Ferreira; de Almeida, Crislaine das Graças; Espeschit, Ana Cristina Rocha; Dantas, Maria Inês de Souza; Benjamin, Laércio dos Anjos; Ribeiro, Sonia Machado Rocha; Martino, Hércia Stampini Duarte

    2013-10-11

    Soybean is termed a functional food because it contains bioactive compounds. However, its effects are not well known under unbalanced diet conditions. This work is aimed at evaluating the effect of adding whole soy flour to a cafeteria diet on intestinal histomorphometry, metabolic risk and toxicity markers in rats. In this study, 30 male adult Wistar rats were used, distributed among three groups (n = 10): AIN-93 M diet, cafeteria diet (CAF) and cafeteria diet with soy flour (CAFS), for 56 days. The following parameters were measured: food intake; weight gain; serum concentrations of triglycerides, total cholesterol, HDL-c, glycated hemoglobin (HbA1c), aspartate (AST) and alanine (ALT) aminotransferases and Thiobarbituric Acid Reactive Substances (TBARS); humidity and lipid fecal content; weight and fat of the liver. The villous height, the crypt depth and the thickness of the duodenal and ileal circular and longitudinal muscle layers of the animals were also measured. There was a significant reduction in the food intake in the CAF group. The CAFS showed lower serum concentrations of triglycerides and serum TBARS and a lower percentage of hepatic fat, with a corresponding increase in thickness of the intestinal muscle layers. In the CAF group, an increase in the HbA1c, ALT, lipid excretion, liver TBARS and crypt depth, was observed associated with lower HDL-c and villous height. The addition of soy did not promote any change in these parameters. The inclusion of whole soy flour in a high-fat diet may be helpful in reducing some markers of metabolic risk; however, more studies are required to clarify its effects on unbalanced diets.

  4. Pre-sliced fruit in school cafeterias: children's selection and intake.

    Science.gov (United States)

    Wansink, Brian; Just, David R; Hanks, Andrew S; Smith, Laura E

    2013-05-01

    It is often assumed that children avoid fruit in school cafeterias because of higher relative prices and preferences for other foods. Interviews with children reveal that eating whole fresh fruit can be difficult for those with small mouths or braces. Older girls find whole fruits messy and unattractive to eat. To determine the effect of offering pre-sliced fruit in schools on selection and intake. Three of six schools were assigned randomly to serve apples in slices. Three control schools served apples whole. Selection, consumption, and waste of apples were measured prior to and during treatment. Cafeterias in six public middle schools in Wayne County NY in 2011. Participants included all students who purchased lunch on days when data were collected. Treatment schools were provided with a standard commercial fruit slicer, and cafeteria staff members were instructed to use it when students requested apples. Trained researchers recorded how much of each apple was consumed and how much was wasted in both control and treatment schools. Daily apple sales, percentage of an apple serving consumed per student, and percentage of an apple serving wasted per student. Data were analyzed in 2012. Schools that used fruit slicers to pre-slice fruit increased average daily apple sales by 71% compared to control schools (papples and ate more than half increased by 73% (p=0.02) at schools that served pre-sliced fruit, and the percentage that wasted half or more decreased by 48% (p=0.03). Sliced fruit is more appealing to children than whole fruit because it is easier and tidier to eat. This study applies the principle of convenience from behavioral economics and provides an example of a scalable, low-cost environmental change that promotes healthy eating and decreases waste. Copyright © 2013. Published by Elsevier Inc. on behalf of American Journal of Preventive Medicine.

  5. Altered feeding patterns in rats exposed to a palatable cafeteria diet: increased snacking and its implications for development of obesity.

    Directory of Open Access Journals (Sweden)

    Sarah I Martire

    Full Text Available BACKGROUND: Rats prefer energy-rich foods over chow and eat them to excess. The pattern of eating elicited by this diet is unknown. We used the behavioral satiety sequence to classify an eating bout as a meal or snack and compared the eating patterns of rats fed an energy rich cafeteria diet or chow. METHODS: Eight week old male Sprague Dawley rats were exposed to lab chow or an energy-rich cafeteria diet (plus chow for 16 weeks. After 5, 10 and 15 weeks, home-cage overnight feeding behavior was recorded. Eating followed by grooming then resting or sleeping was classified as a meal; whereas eating not followed by the full sequence was classified as a snack. Numbers of meals and snacks, their duration, and waiting times between feeding bouts were compared between the two conditions. RESULTS: Cafeteria-fed rats ate more protein, fat and carbohydrate, consistently ingesting double the energy of chow-fed rats, and were significantly heavier by week 4. Cafeteria-fed rats tended to take multiple snacks between meals and ate fewer meals than chow-fed rats. They also ate more snacks at 5 weeks, were less effective at compensating for snacking by reducing meals, and the number of snacks in the majority of the cafeteria-fed rats was positively related to terminal body weights. CONCLUSIONS: Exposure to a palatable diet had long-term effects on feeding patterns. Rats became overweight because they initially ate more frequently and ultimately ate more of foods with higher energy density. The early increased snacking in young cafeteria-fed rats may represent the establishment of eating habits that promote weight gain.

  6. Altered Feeding Patterns in Rats Exposed to a Palatable Cafeteria Diet: Increased Snacking and Its Implications for Development of Obesity

    Science.gov (United States)

    Martire, Sarah I.; Holmes, Nathan; Westbrook, R. Fred; Morris, Margaret J.

    2013-01-01

    Background Rats prefer energy-rich foods over chow and eat them to excess. The pattern of eating elicited by this diet is unknown. We used the behavioral satiety sequence to classify an eating bout as a meal or snack and compared the eating patterns of rats fed an energy rich cafeteria diet or chow. Methods Eight week old male Sprague Dawley rats were exposed to lab chow or an energy-rich cafeteria diet (plus chow) for 16 weeks. After 5, 10 and 15 weeks, home-cage overnight feeding behavior was recorded. Eating followed by grooming then resting or sleeping was classified as a meal; whereas eating not followed by the full sequence was classified as a snack. Numbers of meals and snacks, their duration, and waiting times between feeding bouts were compared between the two conditions. Results Cafeteria-fed rats ate more protein, fat and carbohydrate, consistently ingesting double the energy of chow-fed rats, and were significantly heavier by week 4. Cafeteria-fed rats tended to take multiple snacks between meals and ate fewer meals than chow-fed rats. They also ate more snacks at 5 weeks, were less effective at compensating for snacking by reducing meals, and the number of snacks in the majority of the cafeteria-fed rats was positively related to terminal body weights. Conclusions Exposure to a palatable diet had long-term effects on feeding patterns. Rats became overweight because they initially ate more frequently and ultimately ate more of foods with higher energy density. The early increased snacking in young cafeteria-fed rats may represent the establishment of eating habits that promote weight gain. PMID:23565243

  7. Analysis of Pressure Losses in Conditioned Air Distribution: Case Study of an Industrial Cafeteria

    OpenAIRE

    John I. Sodiki

    2015-01-01

    Fractions of the total head loss which constitute the loss through duct fittings are calculated for various duct runs in a conditioned air distribution system of a cafeteria building project. An ‘Excel’ plot shows a second order increase of the fraction from 0.70 to 0.76 for an increase in duct length from 6.2m to 22.1m. Also, an average fraction of 0.73 was obtained for an average duct length of 15.8m from the computed values. The study shows that the loss through duct fittings constitutes a...

  8. Smoking ban in all restaurants and cafeterias on the CERN site

    CERN Multimedia

    CSR

    2006-01-01

    In 2005 the SCC decided that there would be a total smoking ban in all restaurants and satellite cafeterias on the CERN site, except for the designated area in Restaurant No.1. Unfortunately, it seems that this ban is often over-looked, resulting in an unhealthy and unpleasant environment for the users and staff of these facilities. You are asked to respect this ban and are reminded that smoking is only permitted in the room in Restaurant 1 specially installed for this purpose. The CSR Restaurant Monitoring Committee

  9. Applications of the renewable energies; Aplicaciones de las energias renovables

    Energy Technology Data Exchange (ETDEWEB)

    Gomez Rocha, Luis Martin [Comision Nacional para el Ahorro de Energia, Mexico, D.F. (Mexico)

    2001-07-01

    The solar energy manifests itself in different forms and its application has been fundamental for the humankind development. These forms are known as renewable energies, since they are energy forms that are renewed or remade with time or that are so abundant on Earth, that they will last for hundreds or thousands of years, either we use them or not. The main advantage of the utilization of the renewable energies in comparison with hydrocarbons is the one of having smaller impact on the environment, which brings about the conservation of nonrenewable resources, and to postpone its exhaustion. They allow the distributed generation, diminishing the power losses in the transmission and distribution systems, which increases the overall efficiency. In addition they can be the drive for regional development and generation of employment, because when having applications in remote zones and being a field still not completely developed in Mexico, the possibility exists of enabling professionals and technicians. From the point of view of the power sector, the renewable energies extend the supply and availability of energy, making more flexible and independent the operation and reliability of the national power system. [Spanish] La energia solar se manifiesta de diversas formas y su aplicacion ha sido fundamental para el desarrollo de la humanidad. A estas formas se les conoce como energias renovables, ya que son formas de energia que se van renovando o rehaciendo con el tiempo o que son tan abundantes en la tierra, que perduraran por cientos o miles de anos, las usemos o no. La principal ventaja del aprovechamiento de las energias renovables en comparacion con los hidrocarburos es la de tener menor impacto al medio ambiente, lo que trae consigo la conservacion de recursos no renovables, y posponer su termino. Permiten la generacion distribuida, disminuyendo las perdidas energeticas en los sistemas de transmision y distribucion, lo que incrementa la eficiencia general. Ademas

  10. Design of an ARM-based Automatic Rice-Selling Machine for Cafeterias

    Directory of Open Access Journals (Sweden)

    Zhiliang Kang

    2016-02-01

    Full Text Available To address the problems of low selling efficiency, poor sanitation conditions, labor-intensive requirement, and quick rice cooling speed in manual rice selling in cafeterias, especially in colleges and secondary schools, this paper presented an Advanced RISC Machines (ARM microprocessor-based rice-selling machine for cafeterias. The machines consisted of a funnel-shaped rice bin, a thermal insulation box, and a conveying and scattering mechanism. Moreover, this machine exerts fuzzy control over stepper motor rpm, and the motor drives the conveyor belt with a scraper to scatter rice, deliver it, and keep it warm. Apart from an external 4*4 keyboard, a point of sale (POS machine, an ARM process and a pressure sensor, the machine is also equipped with card swiping and weighting mechanisms to achieve functions of card swiping payment and precise measurement, respectively. In addition, detection of the right amount of rice and the alarm function are achieved using an ultrasonic sensor and a beeper, respectively. The presence of the rice container on the rice outlet is detected by an optoelectronic switch. Results show that this rice-selling machine achieves precise measurement, quick card swiping, fast rice selling, stable operation, and good rice heat preservation. Therefore, the mechanical design enables the machine to achieve its goals.

  11. Dietary supplementation with a specific melon concentrate reverses vascular dysfunction induced by cafeteria diet.

    Science.gov (United States)

    Carillon, Julie; Jover, Bernard; Cristol, Jean-Paul; Rouanet, Jean-Max; Richard, Sylvain; Virsolvy, Anne

    2016-01-01

    Obesity-related metabolic syndrome is associated with high incidence of cardiovascular diseases partially consecutive to vascular dysfunction. Therapeutic strategies consisting of multidisciplinary interventions include nutritional approaches. Benefits of supplementation with a specific melon concentrate, enriched in superoxide dismutase (SOD), have previously been shown on the development of insulin resistance and inflammation in a nutritional hamster model of obesity. We further investigated arterial function in this animal model of metabolic syndrome and studied the effect of melon concentrate supplementation on arterial contractile activity. The study was performed on a hamster model of diet-induced obesity. After a 15-week period of cafeteria diet, animals were supplemented during 4 weeks with a specific melon concentrate ( Cucumis melo L.) Contractile responses of isolated aorta to various agonists and antagonists were studied ex vivo . Cafeteria diet induced vascular contractile dysfunction associated with morphological remodeling. Melon concentrate supplementation partially corrected these dysfunctions; reduced morphological alterations; and improved contractile function, especially by increasing nitric oxide bioavailability and expression of endogenous SOD. Supplementation with the specific melon concentrate improves vascular dysfunction associated with obesity. This beneficial effect may be accounted for by induction of endogenous antioxidant defense. Such an approach in line with nutritional interventions could be a useful strategy to manage metabolic syndrome-induced cardiovascular trouble.

  12. Dietary supplementation with a specific melon concentrate reverses vascular dysfunction induced by cafeteria diet

    Directory of Open Access Journals (Sweden)

    Julie Carillon

    2016-11-01

    Full Text Available Background: Obesity-related metabolic syndrome is associated with high incidence of cardiovascular diseases partially consecutive to vascular dysfunction. Therapeutic strategies consisting of multidisciplinary interventions include nutritional approaches. Benefits of supplementation with a specific melon concentrate, enriched in superoxide dismutase (SOD, have previously been shown on the development of insulin resistance and inflammation in a nutritional hamster model of obesity. Objective: We further investigated arterial function in this animal model of metabolic syndrome and studied the effect of melon concentrate supplementation on arterial contractile activity. Design and results: The study was performed on a hamster model of diet-induced obesity. After a 15-week period of cafeteria diet, animals were supplemented during 4 weeks with a specific melon concentrate (Cucumis melo L. Contractile responses of isolated aorta to various agonists and antagonists were studied ex vivo. Cafeteria diet induced vascular contractile dysfunction associated with morphological remodeling. Melon concentrate supplementation partially corrected these dysfunctions; reduced morphological alterations; and improved contractile function, especially by increasing nitric oxide bioavailability and expression of endogenous SOD. Conclusions: Supplementation with the specific melon concentrate improves vascular dysfunction associated with obesity. This beneficial effect may be accounted for by induction of endogenous antioxidant defense. Such an approach in line with nutritional interventions could be a useful strategy to manage metabolic syndrome–induced cardiovascular trouble.

  13. A comparison of bite size and BMI in a cafeteria setting.

    Science.gov (United States)

    Mattfeld, Ryan S; Muth, Eric R; Hoover, Adam

    2017-11-01

    Our study investigated the relationship between BMI and bite size in a cafeteria setting. Two hundred and seventy one participants consumed one meal each. Participants were free to select any food provided by the cafeteria and could return for additional food as desired. Bite weights were measured with a table embedded scale. Data were analyzed with ANOVAs, regressions, Kolmogorov-Smirnov tests, and a repeated measures general linear model for quartile analysis. Obese participants were found to take larger bites than both normal (p=0.002) and overweight participants (p=0.017). Average bite size increased by 0.20g per point increase in BMI. Food bites and drink bites were analyzed individually, showing 0.11g/BMI and 0.23g/BMI slopes, respectively. Quartiles of bites were also analyzed, and a significant interaction was found between normal and obese participants (p=0.034) such that the lower two quartiles were similar, but the upper two quartiles showed an increase in bite size for obese participants. The source of these effects could be the result of a combination of several uncontrolled factors. Copyright © 2017 Elsevier Inc. All rights reserved.

  14. Increasing consumption of fruits and vegetables in the school cafeteria: the influence of active choice.

    Science.gov (United States)

    Hakim, Sharon M; Meissen, Gregory

    2013-01-01

    This study evaluated a setting-level intervention designed to increase consumption of fruits and vegetables among low-socioeconomic status elementary and middle school students participating in the National School Lunch Program (NSLP). The NSLP provides students with access to fruits and vegetables; however, food served does not necessarily equal food consumed. High rates of waste, especially of fruits and vegetables, are well documented. The current, low-cost intervention altered the choice architecture of the cafeteria by introducing an active, forced choice into the school lunch service. Consumption was measured by observing (n=2,064) and weighing (n=84) student plate waste over two 10-day periods pre-intervention and during implementation. Results show an average daily 15% increase in consumption of both fruits and vegetables during the intervention period. These findings suggest that local schools can actively encourage students to take advantage of fruits and vegetables offered through the NSLP by implementing setting-level changes to the cafeteria environment.

  15. Modulation in Wistar Rats of Blood Corticosterone Compartmentation by Sex and a Cafeteria Diet

    Science.gov (United States)

    Romero, María del Mar; Holmgren-Holm, Fredrik; Grasa, Maria del Mar; Esteve, Montserrat; Remesar, Xavier; Fernández-López, José Antonio; Alemany, Marià

    2013-01-01

    In the metabolic syndrome, glucocorticoid activity is increased, but circulating levels show little change. Most of blood glucocorticoids are bound to corticosteroid-binding globulin (CBG), which liver expression and circulating levels are higher in females than in males. Since blood hormones are also bound to blood cells, and the size of this compartment is considerable for androgens and estrogens, we analyzed whether sex or eating a cafeteria diet altered the compartmentation of corticosterone in rat blood. The main corticosterone compartment in rat blood is that specifically bound to plasma proteins, with smaller compartments bound to blood cells or free. Cafeteria diet increased the expression of liver CBG gene, binding plasma capacity and the proportion of blood cell-bound corticosterone. There were marked sex differences in blood corticosterone compartmentation in rats, which were unrelated to testosterone. The use of a monoclonal antibody ELISA and a polyclonal Western blot for plasma CBG compared with both specific plasma binding of corticosterone and CBG gene expression suggested the existence of different forms of CBG, with varying affinities for corticosterone in males and females, since ELISA data showed higher plasma CBG for males, but binding and Western blot analyses (plus liver gene expression) and higher physiological effectiveness for females. Good cross- reactivity to the antigen for polyclonal CBG antibody suggests that in all cases we were measuring CBG.The different immunoreactivity and binding affinity may help explain the marked sex-related differences in plasma hormone binding as sex-linked different proportions of CBG forms. PMID:23451210

  16. College cafeteria snack food purchases become less healthy with each passing week of the semester.

    Science.gov (United States)

    Wansink, Brian; Cao, Ying; Saini, Prerna; Shimizu, Mitsuru; Just, David R

    2013-07-01

    Snacks, stress and parties all contribute to the weight gain – the elusive ‘Freshman 15’ – that some college-goers unfortunately experience. The present study examines how a` la carte snack choice changes on a university campus during each progressing week of the academic calendar. How a` la carte snack choices change on a university campus with each progressing week of the academic calendar was examined. The data were collected from three large cafeterias (or dining halls) on Cornell University’s campus during four semesters (Fall 2006, Spring 2007, Fall 2007 and Spring 2008), for 18 weeks in each semester. After the a` la carte snack items were divided into healthy snacks and unhealthy snacks, the percentage share for each food category was calculated. Within each semester, the unhealthy snack food choices increased consistently by 0?4% per week (b50?00418, P,0?01). Furthermore, a sharp (8 %) increase occurred in the final two weeks of the semester. In contrast, healthy snack food choices decreased by almost 4% (b520?0408, P,0?01) in the final two weeks during the fall semester. These results demonstrate an increased demand for hedonic, or unhealthy, snack foods as the college semester progresses and in particular at the very end of the semester. To counter this tendency towards unhealthy snacking, cafeterias and stores should make extra effort to promote healthy alternatives during the later weeks of the semester.

  17. Facilitators and barriers to healthy eating in a worksite cafeteria: a qualitative study from Nepal

    Science.gov (United States)

    Shrestha, Archana; Pyakurel, Prajjwal; Shrestha, Abha; Gautam, Rabin; Manandhar, Nisha; Rhodes, Elizabeth; Tamrakar, Dipesh; Karmacharya, Biraj Man; Malik, Vasanti; Mattei, Josiemer; Spiegelman, Donna

    2017-01-01

    Objective Worksite interventions can serve as a potential platform for translating existing knowledge of diabetes prevention and facilitate healthy food choices. The study explored perceptions about healthy eating as well as potential facilitators and barriers to healthy eating among employees in a wire manufacturing factory in Nepal. Methods and materials We conducted a cross-sectional exploratory qualitative study in a wire manufacturing industry in eastern Nepal. We conducted three focus group discussions (FGDs) with a total of 26 employees and four in-depth interviews (IDIs) with cafeteria operators/managers from a wire manufacturing factory in eastern Nepal. FGDs and IDIs were audio-recorded, transcribed verbatim and analysed using the thematic method. Results Most employees defined healthy eating as the consumption of food prepared and maintained using hygienic practices and fresh foods in general. Major barriers to healthy eating included unavailability of healthy foods, difficulty in changing eating habits, the preference for fried foods in Nepali culture and the high costs of some healthy foods. The most commonly reported facilitator of healthy eating was the availability of affordable healthy food options in worksite cafeterias. Conclusion Availability of healthy food options at an affordable price could lead to healthier food choices in the worksite. PMID:29225703

  18. Efficiency of Tea Disposal from Cafeteria for Removal Nickel ion from Contaminated Groundwater

    Directory of Open Access Journals (Sweden)

    Rusul Nasser Mohammed

    2017-07-01

    Full Text Available This work aims to study the removal of Nickel from ground water using low cost adsorbent tea waste from cafeteria. The total adsorbed amounts, equilibrium uptakes and overall removal efficiency of Nickel were determined by investigating the breakthrough curve obtained at different inlet Nickel concentrations, various pH value, gain size of waste tea and bed height. Decrease in the grain size of adsorbent tea from 0.3 to 0.05 cm resulted in essential increase in the removal rate and total adsorbed amounts while increasing the bed depth leads the increase of bed capability and the breakthrough period. The experimental data were calibrated using three isotherm models, Dubinin- Radushkevich (DRM Langmuir (LM , Freundlich (FM where the experimental data is well fitted to the Langmuir (LM. Experimental and theoretical breakthrough study showed that the prolonged breakthrough period and maximum capability of nickel is achieved at pH of 3, 125 mg/L of inlet concentration and 0.5 m of bed depth. As a final engineering observation, waste tea from cafeteria is a good and low-cost material that can absorb nickel from groundwater.

  19. Methodology of aging management in structures, systems and components of a nuclear power plant and its application to a pilot program in Laguna Verde; Metodologia de la gestion del envejecimiento en estructuras, sistemas y componentes de una central nuclear y su aplicacion a un programa piloto en Laguna Verde

    Energy Technology Data Exchange (ETDEWEB)

    Jarvio C, G. [ININ, Carretera Mexico-Toluca s/n, 52750 Ocoyoacac, Estado de Mexico (Mexico); Fernandez S, G. [Comision Federal de Electricidad, Gerencia de Centrales Nucleoelectricas, Subgerencia de Ingenieria, Carretera Veracruz-Medellin Km. 7.5, Dos Bocas, 54270 Veracruz (Mexico)], e-mail: gfdezs@cfe.gob.mx

    2009-10-15

    From its origin the nuclear power plants confront the effects of time and of environment, giving as result the aging of its structures, systems and components. In this document the general process is described for the establishment of Aging Management Program developed by IAEA. Following the program methodology is guaranteed that a nuclear power plant manages the aging effects appropriately and to make decisions for its solution, assuring the characteristic functions of structures, systems and components of same nuclear power plant. On the other hand, the implantation of an aging management program constitutes the base for development of a licence renovation program, like it can be the specific case of the Central Laguna Verde Units 1 and 2. (Author)

  20. Codificación de red y sus aplicaciones

    Directory of Open Access Journals (Sweden)

    Francisco de Asís López Fuentes

    2014-01-01

    Full Text Available Este documento presenta una revisión general de una nueva técnica en el campo de la teoría de la información, llamada “codificación de red”. La codificación de red se presenta como una técnica prometedora y de activa investigación en la teoría de redes. Diversos beneficios relacionados al flujo de información, tales como un óptimo aprovechamiento del ancho de banda y la reducción de retardos en redes de extremo a extremo han sido reportados en la literatura. Nuestro trabajo en este documento se enfoca principalmente a los siguientes aspectos de codificación de red: planteamiento del modelo, áreas de aplicación y beneficios obtenidos al usar esta técnica. Los aspectos discutidos en este trabajo cubren tanto a las redes fijas como móviles. El objetivo de este artículo es mostrar al lector la relevancia y potencial de esta técnica y las aplicaciones que se están desarrollando a su alrededor.

  1. Aplicaciones del GRC en España y Argelia

    Directory of Open Access Journals (Sweden)

    Rodríguez Santiago, Jesús

    1986-09-01

    Full Text Available Not Available.Este artículo resume la experiencia obtenida en la utilización del mortero de cemento reforzado con fibra de vidrio (GRC en el campo de la construcción. Se describen en primer lugar las características del material y el proceso de fabricación en factoría de paneles de GRC. Se exponen a continuación algunas realizaciones llevadas a cabo con este material destacando, por su volumen y rapidez de ejecución, el conjunto de fachadas para edificios de viviendas, hospitales y centros escolares construidos en Argelia. También se comentan otras aplicaciones del GRC para la rehabilitación y decoración interior de edificios y para la construcción de elementos singulares. Finalmente, en el apartado de las conclusiones se menciona la necesidad de seguir investigando en el comportamiento a largo plazo de este material para poder aumentar su utilización en la construcción.

  2. The Case of the Unreturned Cafeteria Trays: An Investigation Based upon Theories of Motivation and Human Behavior.

    Science.gov (United States)

    Etheredge, Lloyd S.

    This student manual is intended to help undergraduate political science students analyze human behavior. The manual poses the problem of why a group of high school students failed to take their cafeteria trays to the dirty dish room. It presents alternative solutions which students discuss as they explore various interpretations of human…

  3. Project Refresh: Testing the Efficacy of a School-Based Classroom and Cafeteria Intervention in Elementary School Children

    Science.gov (United States)

    Song, Hee-Jung; Grutzmacher, Stephanie; Munger, Ash L.

    2016-01-01

    Background: The purpose of this study was to assess the effect of a school-based nutrition program using a cafeteria environment intervention and classroom nutrition education on self-reported fruit and vegetable (FV) consumption, self-efficacy to select FV, and preference for healthy foods. Methods: Using quasi-experimental pre-post design with 3…

  4. Altered Nitrogen Balance and Decreased Urea Excretion in Male Rats Fed Cafeteria Diet Are Related to Arginine Availability

    Science.gov (United States)

    Sabater, David; Arriarán, Sofía; Fernández-López, José-Antonio; Romero, María del Mar; Remesar, Xavier

    2014-01-01

    Hyperlipidic diets limit glucose oxidation and favor amino acid preservation, hampering the elimination of excess dietary nitrogen and the catabolic utilization of amino acids. We analyzed whether reduced urea excretion was a consequence of higher NOx; (nitrite, nitrate, and other derivatives) availability caused by increased nitric oxide production in metabolic syndrome. Rats fed a cafeteria diet for 30 days had a higher intake and accumulation of amino acid nitrogen and lower urea excretion. There were no differences in plasma nitrate or nitrite. NOx and creatinine excretion accounted for only a small part of total nitrogen excretion. Rats fed a cafeteria diet had higher plasma levels of glutamine, serine, threonine, glycine, and ornithine when compared with controls, whereas arginine was lower. Liver carbamoyl-phosphate synthetase I activity was higher in cafeteria diet-fed rats, but arginase I was lower. The high carbamoyl-phosphate synthetase activity and ornithine levels suggest activation of the urea cycle in cafeteria diet-fed rats, but low arginine levels point to a block in the urea cycle between ornithine and arginine, thereby preventing the elimination of excess nitrogen as urea. The ultimate consequence of this paradoxical block in the urea cycle seems to be the limitation of arginine production and/or availability. PMID:24707502

  5. The Relationship between Nutrition Knowledge and School Cafeteria Purchases of Seventh Grade Students in a Rural Indiana School District

    Science.gov (United States)

    Pucciarelli, Deanna; McNeany, Terry; Friesen, Carol

    2013-01-01

    Purpose/Objective: School cafeterias have the potential to positively contribute to the prevention and treatment of childhood obesity. The purpose of this project was to assess adolescents' nutrition knowledge and dietary choices, and to measure the relationship between students' nutrition knowledge and the type of food items purchased in their…

  6. Go Slow Whoa Meal Patterns: Cafeteria Staff and Teacher Perceptions of Effectiveness in "Winning with Wellness" Schools

    Science.gov (United States)

    Slawson, Deborah L.; Southerland, Jodi; Lowe, Elizabeth F.; Dalton, William T.; Pfortmiller, Deborah T.; Schetzina, Karen

    2013-01-01

    Background: School-based interventions hold promise for child obesity prevention. Implemented as a part of the "Winning with Wellness" obesity prevention project, the "Go Slow Whoa" meal pattern (GSW) was designed to promote healthier foods in school cafeterias. This investigation determined perceived program effectiveness and…

  7. Influence of placement of a nutrition logo on cafeteria menu items on lunchtime food Choices at Dutch work sites.

    Science.gov (United States)

    Vyth, Ellis L; Steenhuis, Ingrid H M; Heymans, Martijn W; Roodenburg, Annet J C; Brug, Johannes; Seidell, Jacob C

    2011-01-01

    This study investigated the effectiveness of labeling foods with the Choices nutrition logo on influencing cafeteria menu selection and the behavioral determinants of menu choices in work site cafeterias in the Netherlands. A cluster randomized controlled trial was conducted. Intervention cafeterias (n=13), where the Choices logo was used to promote healthier eating for a 3-week period, were compared with control cafeterias (n=12), which offered the same menu without the logo. Sales data were collected daily for 9 weeks, from March to May 2009. In addition, employees from one intervention and one control company completed an online questionnaire at baseline and after the intervention (n=368) in which the behavioral determinants of food choice (ie, attitude, self-efficacy, and intention) and logo use were measured. Generalized estimating equation analyses, χ² tests, t tests and linear regression analyses were performed. No nutritionally meaningful intervention effects were found in the sales of sandwiches, soups, snacks, fruit, and salads. Also, no significant differences in behavioral determinants were found. "Intention to eat healthier" and "paying attention to product information" were positively associated with self-reported consumption of foods with the Choices logo at lunch. The intervention did not have a significant effect on employees' lunchtime food choices. Labeling healthy choices might be useful for health-conscious employees in the volitional phase of behavior change. Further research should focus on the possible health benefits of menu reformulation in the catering sector. Copyright © 2011 American Dietetic Association. Published by Elsevier Inc. All rights reserved.

  8. A Pricing Strategy To Promote Sales of Lower Fat Foods in High School Cafeterias: Acceptability and Sensitivity Analysis.

    Science.gov (United States)

    Hannan, Peter; French, Simone A.; Story, Mary; Fulkerson, Jayne A.

    2002-01-01

    Examined the purchase patterns of seven targeted foods under conditions in which prices of three high-fat foods were raised and prices of four low-fat foods were lowered in a high school cafeteria over 1 school year. Data collected on food sales and revenues supported the feasibility of a pricing strategy that offered low-fat foods at lower prices…

  9. Effects of a cafeteria diet on delay discounting in adolescent and adult rats: Alterations on dopaminergic sensitivity.

    Science.gov (United States)

    Robertson, Stephen H; Rasmussen, Erin B

    2017-11-01

    Diet-induced obesity is a laboratory procedure in which nonhuman animals are chronically exposed to a high-fat, high-sugar diet (i.e. cafeteria diet), which results in weight gain, altered sensitivity to reward, and alterations in the dopamine D 2 system. To date, few (if any) studies have examined age-related diet-induced obesity effects in a rat model or have used an impulsive choice task to characterize diet-induced behavioral alterations in reward processes. We exposed rats to a cafeteria-style diet for eight weeks starting at age 21 or 70 days. Following the diet exposures, the rats were tested on a delay discounting task - a measure of impulsive choice in which preference for smaller, immediate vs larger, delayed food reinforcers was assessed. Acute injections of haloperidol (0.03-0.3 mg/kg) were administered to assess the extent to which diet-induced changes in dopamine D 2 influence impulsive food choice. Across both age groups, rats fed a cafeteria diet gained the most weight and consumed more calories than rats fed a standard diet, with rats exposed during development showing the highest weight gain. No age- or diet-related baseline differences in delay discounting were revealed, however, haloperidol unmasked subtle diet-related differences by dose-dependently reducing choice for the larger, later reinforcer. Rats fed a cafeteria diet showed a leftward shift in the dose-response curve, suggesting heightened sensitivity to haloperidol, regardless of age, compared to rats fed a standard diet. Results indicate that chronic exposure to a cafeteria diet resulted in changes in underlying dopamine D 2 that manifested as greater impulsivity independent of age at diet exposure.

  10. Gestión dinámica de aplicaciones master-worker sobre sistemas distribuidos

    OpenAIRE

    Heymann, E.; Senar, Miguel Ángel; Luque Fadón, Emilio

    2000-01-01

    Las aplicaciones paralelas que obedecen al paradigma ntaster-worker necesitan de políticas de gestión con objeto de maximizar el rendimiento de la aplicación a la vez que se hace un uso eficiente de Los recursos de cómputo. En este trabajo proponemos una política simple que es capaz de realizar la gestión dinámicamente de aplicaciones master-worker a partir de la información que se obtiene en tiempo real sobre la misma. La política es capaz de qjustar el número de procesadores utilizados por ...

  11. Desarrollo de estructuras quirales sostenibles para aplicaciones tecnológicas avanzadas

    OpenAIRE

    Márquez Sánchez-Carnerero, Esther María

    2016-01-01

    La presente Tesis, titulada “Desarrollo de estructuras quirales sostenibles para aplicaciones tecnológicas avanzadas”, versa sobre el diseño, síntesis y estudio de compuestos orgánicos enantiopuros de fácil acceso sintético para aplicaciones técnicas futuras relacionadas con la catálisis asimétrica y la quiroóptica. Concretamente, se han desarrollado nuevos ligandos quirales soportados de alta sostenibilidad dirigidos a la facilitación de la aplicación industrial de las reacciones de adición ...

  12. Application of frequency converters in industry; Aplicacion de convertidores de frecuencia en la industria

    Energy Technology Data Exchange (ETDEWEB)

    Adame Gonzalez, A.; Aguilar Galvan, A. [Ingenieria Energetica Integral, S.A. de C.V. (Mexico)

    1997-12-31

    Some of the applications of the frequency converters will be analyzed, as well as the parameters to be considered for the feasibility of its application evaluation. It is also described how an energy evaluation is accomplished and finally a series of actions are enlisted conducting to the energy savings. [Espanol] Se presentaran algunas de las aplicaciones de los convertidores de frecuencia. Ademas se indicaran los parametros a registrar para evaluar la factibilidad de aplicacion de los mismos, se describe como ejecutar la evaluacion energetica y finalmente se listan una serie de acciones que conducen a lograr ahorros de energia.

  13. Inversores bidireccionales con aislamiento en alta frecuencia para aplicaciones de energías renovables

    OpenAIRE

    Beristáin Jiménez, José Antonio

    2005-01-01

    En esta tesis se realiza el análisis y la síntesis de inversores bidireccionales con aislamiento en alta frecuencia. Entre las aplicaciones que se contemplan podemos destacar: sistemas de alimentación fotovoltaicos, sistemas de alimentación utilizando celdas de combustible, mini-generadores eólicos y compensación armónica. Hay dos grandes requerimientos para varias de estas aplicaciones. En primer lugar, es necesario proporcionar aislamiento eléctrico entre la fuente de corriente continua y l...

  14. Aplicaciones de las fibras naturales en los textiles de uso técnico

    OpenAIRE

    Ardanuy Raso, Mònica

    2010-01-01

    Por razones de sostenibilidad y por una concienciación cada vez mayor hacia el uso de materiales procedentes de recursos renovables, en los últimos años se está constatando un uso cada vez más frecuente de fibras naturales. En este sentido, fibras celulósicas como las de lino o cáñamo, entre otras, tienen importantes aplicaciones en los textiles de uso técnico de los sectores de la construcción, automoción o industriales. Igualmente se están buscando nuevas aplicaciones técnicas para otros ti...

  15. Identificación de prestaciones en nuevas aplicaciones de vidrio estructural

    OpenAIRE

    Abascal Capilla, Alba

    2016-01-01

    El presente Trabajo Fin de Grado consiste en la identificación de las prestaciones que se deben cumplir de cara al diseño de los elementos de vidrio estructural para aplicaciones actuales, novedosas e innovadoras. Para la identificación de las prestaciones se comienza por una evaluación del estado actual del vidrio; posteriormente se hace una selección de obras innovadoras en aplicaciones existentes con vidrio estructural (fachadas, cubiertas, barandillas, suelos, escaleras, pilares y viga...

  16. Estimation of geological storage capacity of CO{sub 2}: Methodology and implementation to the Duero basin (Central East Area); Estimacion de la Capacidad de Almacenamiento Geologico de CO{sub 2}: Metodologia y Aplicacion a la Cuenca del Duero (Zona Centro-Oriental)

    Energy Technology Data Exchange (ETDEWEB)

    Hurtado, A.; Eguilior, S.

    2008-08-06

    This paper presents the methodology for assessment of the storage capacity into a saline aquifer depth and the results of the studies carried out in the central east area of the Duero Basin. The extension of the study area represents about 40% of the basin. This methodology has been conducted under the need of estimate of uncertainty in everything related to behavior of long-term stored CO{sub 2} in geological formations because one of the major challenges associated with this activity is ensuring the retention of stored CO{sub 2} along the period of the required time. The method is based on the implementation of a Geographic Information System as a tool for capture, storage, management and presentation of data in maps, as well as a tool for analysis and modelling through its link to both geostatistical methods and description of CO{sub 2} thermodynamic behaviour in deep geological storage conditions, by using real gases Equations of States, specially the Sterner-Pitzer Cubic Equation of State. All these analyses are accompanied by the error propagation due to the calculations required for the determination of the volume of rock, the vertical accuracy of the topographic layers, as well as other uncertainties associated with the variables required for the characterization of the CO{sub 2} in the storage conditions. The conclusion is that the deep geologic CO{sub 2} storage capacity in the study area is between 1,667 and 11,976 Mt, i.e. between 11 and 81 years of storage capacity with a current spanish CO{sub 2} production of 148 Mt/year. (Author) 40 refs.

  17. Células tronco mesenquimales: definiciones, cultivo y aplicaciones potenciales

    Directory of Open Access Journals (Sweden)

    Willy Ceron

    Full Text Available En los últimos años, las células troncales mesenquimales (Mesenchymal Stem Cells, MSC han adquirido mucha importancia debido a su gran plasticidad y su capacidad de liberar factores paracrinos con capacidad de interactuar con diversos tipos celulares, tejidos y órganos. El uso de MSC en medicina regenerativa es importante debido a que, al no expresar las moléculas del complejo mayor de histocompatibilidad (MHC clase II ni moléculas co-estimuladoras y tener baja expresión del MHC clase I, haría que no sean rechazadas por individuos de la misma especie, es posible utilizarlas no sólo de manera autóloga, sino también, eventualmente, alogénica. Sin embargo, es importante demostrar científicamente muchas de sus propiedades, entre ellas las inmunomoduladoras. Al tener varias fuentes de obtención, se debe estandarizar la que sea la mejor para garantizar la pureza y calidad de las MSC. Finalmente, es importante que cuando se trabaje con estas células se demuestre completamente las características del cultivo celular, la inmunotipificación y su capacidad de diferenciación. Se están ensayando muchas aplicaciones clínicas de las MSC. Dentro de ellas, su capacidad para mejorar la recuperación y potencial curación de úlceras crónicas como las diabéticas, ha atraído la atención por su potencial impacto terapéutico.

  18. Deporte con dispositivos de posicionamiento global (GPS: Aplicaciones y limitaciones

    Directory of Open Access Journals (Sweden)

    Julen Castellano

    2014-01-01

    Full Text Available En el presente documento se hace una revisión no exhaustiva sobre la aplicabilidad y limitaciones de los dispositivos GPS en el ámbito deportivo. En el trabajo se detallan aspectos claves que técnicos e investigadores deberían considerar para valorar los límites de su aplicabilidad al tiempo que maximizar su uso. Las temáticas que se abordan pueden concretarse es los siguientes: funcionamiento, limitaciones, diferentes usos motivados por la variedad en la tipología de variables que registra, oportunidades de sincronización con el vídeo o con la representación 2D del movimiento de los jugadores en el espacio (para posteriores análisis más pormenorizados, así como la disponibilidad de la información en ‘tiempo real’. Además, la tecnología GPS está dando sus primeros pasos para aportar información no solo de las demandas físicas o energéticas de los deportistas, sino también de las conductas colectivas que jugadores y equipos despliegan en sus actividades (partido, juegos reducidos, etc. Valoradas las limitaciones y valoradas sus aplicaciones los usuarios podrán beneficiarse de los dispositivos GPS cuando se apliquen al análisis del rendimiento en la competición y el entrenamiento. Esta tecnología puede ayudar a entrenadores y atletas en el desarrollo de sus trabajos o actividades con precisión, inmediatez y riqueza informacional.

  19. Small Prizes Improve Food Selection in a School Cafeteria Without Increasing Waste.

    Science.gov (United States)

    Hudgens, Michelle E; Barnes, Allison S; Lockhart, Mary Kate; Ellsworth, Samantha C; Beckford, Monna; Siegel, Robert M

    2017-02-01

    We recently demonstrated that small prizes given for a "Power Plate" (plain fat-free milk, entrée, fruit and vegetable) can be used in an elementary school cafeteria to increase healthful food selection by over 300%. The purpose of this study was to measure changes in food waste when the Power Plate (PP) program is implemented. The PP intervention was conducted at an inner-city elementary school. Emoticons were placed next to the preferred foods and children were given a small prize if they selected the PP. Data were obtained by observation and cash register receipts. The trays of 111 students before the intervention and 96 after were examined for content and waste. PP selection increased from 2% to 73% ( P food selection does not lead to an increase food waste.

  20. ROLE-PLAYS VS. NATURAL DATA: ASKING FOR A DRINK AT A CAFETERIA IN PENINSULAR SPANISH

    Directory of Open Access Journals (Sweden)

    Rebeca Bataller

    2013-08-01

    Full Text Available The purpose of this study is to compare the data collected, via two methods, from two groups of Peninsular Spanish native speakers in a service encounter scenario. The methods chosen are open role-plays and naturally occurring interactions, two frequently used approaches in the field of pragmatics. The naturalistic data from this study consisted of request-for-service transactions at cafeterias in Valencia, Spain; these were recorded with audio equipment and then analyzed at the illocutionary and discourse levels. The features analyzed were the strategies and mitigating devices used in all phases of the interactions. The structure and length of interactions from each dataset were also compared. The results of this comparative study indicate that the role-play data resembled the naturalistic interactions in some respects, but there were also some significant differences between the two datasets that may be attributed to the particular type of collection method.

  1. Prevalence of intestinal parasites among food handlers at cafeteria of Jimma University Specialized Hospital, Southwest Ethiopia

    Directory of Open Access Journals (Sweden)

    Hundaol Girma

    2017-08-01

    Full Text Available Objective: To assess the prevalence of intestinal parasites and associated risk factors among food-handlers working at cafeteria of Jimma University Specialized Hospital, Jimma, Ethiopia. Methods: Socio-demographic and associated risk factors data were collected using a pretested structured questionnaire. Stool and finger-nail specimens were screened for intestinal parasites using direct wet mount and formol-ether concentration sedimentation techniques. Data were edited, cleaned, entered and analyzed using statistical package for social science (SPSS version 20. P ≤ 0.05 was taken as statistically significant. Results: A total of 94 food-handlers working at cafeteria of Jimma University Specialized Hospital were participated in the study. From the total 148 samples (94 stool and 54 fingernails content examined, 31 (33% were positive for one or more parasites. Over all eight types of intestinal parasites were identified. The most prevalent parasite identified was Ascaris lumbricoides (16% followed by Entamoeba histolytica/dispar (4.3%. There was significant association between parasitic infection and food handlers who did not practice hand washing after defecation and before serving food. Conclusions: Relatively high prevalence of intestinal parasites is detected indicating poor hygiene practice of the food-handlers at the study site. The study also identified finger-nail status, hand washing after defecation and before serving food as determinants of intestinal parasitic infection. It is crucial for provision of regular training on strict adherence to good personal hygiene and hygienic food-handling practices as well as regular inspection and medical checkup of food-handlers.

  2. Food choices of minority and low-income employees: a cafeteria intervention.

    Science.gov (United States)

    Levy, Douglas E; Riis, Jason; Sonnenberg, Lillian M; Barraclough, Susan J; Thorndike, Anne N

    2012-09-01

    Effective strategies are needed to address obesity, particularly among minority and low-income individuals. To test whether a two-phase point-of-purchase intervention improved food choices across racial, socioeconomic (job type) groups. A 9-month longitudinal study from 2009 to 2010 assessing person-level changes in purchases of healthy and unhealthy foods following sequentially introduced interventions. Data were analyzed in 2011. Participants were 4642 employees of a large hospital in Boston MA who were regular cafeteria patrons. The first intervention was a traffic light-style color-coded labeling system encouraging patrons to purchase healthy items (labeled green) and avoid unhealthy items (labeled red). The second intervention manipulated "choice architecture" by physically rearranging certain cafeteria items, making green-labeled items more accessible and red-labeled items less accessible. Proportion of green- (or red-) labeled items purchased by an employee. Subanalyses tracked beverage purchases, including calories and price per beverage. Employees self-identified as white (73%); black (10%); Latino (7%); and Asian (10%). Compared to white employees, Latino and black employees purchased a higher percentage of red items at baseline (18%, 28%, and 33%, respectively, p0.05 for interaction between race or job type and intervention). Mean calories per beverage decreased similarly over the study period for all racial groups and job types, with no increase in per-beverage spending. Despite baseline differences in healthy food purchases, a simple color-coded labeling and choice architecture intervention improved food and beverage choices among employees from all racial and socioeconomic backgrounds. Copyright © 2012 American Journal of Preventive Medicine. Published by Elsevier Inc. All rights reserved.

  3. A cafeteria diet modifies the response to chronic variable stress in rats.

    Science.gov (United States)

    Zeeni, N; Daher, C; Fromentin, G; Tome, D; Darcel, N; Chaumontet, C

    2013-03-01

    Stress is known to lead to metabolic and behavioral changes. To study the possible relationships between stress and dietary intake, male Sprague-Dawley rats were fed one of three diets for 6 weeks: high carbohydrate (HC), high fat (HF), or "Cafeteria" (CAF) (Standard HC plus a choice of highly palatable cafeteria foods: chocolate, biscuits, and peanut butter). After the first 3 weeks, half of the animals from each group (experimental groups) were stressed daily using a chronic variable stress (CVS) paradigm, while the other half of the animals (control groups) were kept undisturbed. Rats were sacrificed at the end of the 6-week period. The effects of stress and dietary intake on animal adiposity, serum lipids, and corticosterone were analyzed. Results showed that both chronic stress and CAF diet resulted in elevated total cholesterol, increased low-density lipoprotein (LDL), and lower high-density lipoprotein (HDL). In addition, increases in body weight, food intake, and intra-abdominal fat were observed in the CAF group compared with the other dietary groups. In addition, there was a significant interaction between stress and diet on serum corticosterone levels, which manifest as an increase in corticosterone levels in stressed rats relative to non-stressed controls in the HC and HF groups but not in the CAF group. These results show that a highly palatable diet, offering a choice of food items, is associated with a reduction in the response to CVS and could validate a stressor-induced preference for comfort food that in turn could increase body weight.

  4. Does a grill menu redesign influence sales, nutrients purchased, and consumer acceptance in a worksite cafeteria?

    Directory of Open Access Journals (Sweden)

    Maya K. Vadiveloo

    2017-12-01

    Full Text Available Worksite cafeterias are compelling venues to improve diet quality through environmental changes.We conducted a pre-post study to evaluate how a cafeteria-initiated grill menu redesign influenced sales, revenue, and nutrient content of foods purchased. Secondly, we evaluated consumer opinions about menu changes to inform practices for worksite environment interventions. Monthly sales data (2012–2015 were used to compute gross sales and revenue of entrées and side dishes pre-post menu changes. Alternative protein sources replaced red meat; nutrient composition and nutrients purchased were compared using Food Pro software. Consumer responses were queried using online surveys; open-ended responses were analyzed using NVivo. Differences in sales and nutrient content pre-post menu redesign were tested with Wilcoxon Rank Sum tests. Gross sales of entrées (61 vs. 222servings/month; p=0.01 and side dishes (120 vs. 365servings/month; p=0.001 increased more than three-fold post-menu changes. Revenue from entrées (312 vs. 1144USD/month; p=0.01 and side dishes (238 vs. 914USD/month; p=0.001 also increased; per entrée, consumers purchased significantly more unsaturated fat (5g, and less saturated fat (3g and sodium (100mg. For side dishes, they purchased fewer calories (48kcal and unsaturated fat (2.9g, but more fiber (1.8g, and sodium (260mg. Four themes emerged from consumer responses: the importance of 1 variety, novelty, choice; 2 cost, affordability, value; 3 health; and 4 food quality, taste. Menu redesign can improve nutrient content, while also increasing sales and revenue. Multi-dimensional assessment of the nutritional, consumer, and retailer implications is desirable practice for enacting similar environmental changes. Keywords: Worksite health promotion, Food environment change, Consumer satisfaction, Menu redesign, Sales and revenue

  5. Effect of the Strong4Life School Nutrition Program on Cafeterias and on Manager and Staff Member Knowledge and Practice, Georgia, 2015.

    Science.gov (United States)

    Rajbhandari-Thapa, Janani; Bennett, Ashley; Keong, Farrah; Palmer, Wendy; Hardy, Trisha; Welsh, Jean

    The goal of the Strong4Life School Nutrition Program is to promote healthy eating in school cafeterias in Georgia by training school nutrition managers and staff members to implement changes in the cafeteria to nudge children to make healthier choices. The objective of our study was to evaluate program effect on (1) school nutrition manager and staff member knowledge of evidence-based strategies and their self-efficacy to make positive changes, (2) the school cafeteria environment, and (3) National School Lunch Program participation. We assessed changes in participant knowledge, beliefs, and self-efficacy by administering a survey before and after training (February-July 2015); a follow-up survey (3 school months posttraining) assessed changes in the cafeteria. A total of 842 school nutrition managers and staff members were trained and completed pre- and posttraining surveys; 325 managers completed the follow-up survey. We used cafeteria records from a subsample of the first schools trained (40 intervention and 40 control) to assess National School Lunch Program participation. From pretraining to posttraining, we found a significant increase in manager and staff member (n = 842) knowledge of strategies for enhancing taste perception through the use of creative menu item names (from 78% to 95%, P food placement in the lunch line influences food selection (from 78% to 95%, P cafeteria environment (from 91% to 96%, P 2 locations, P School Lunch Program participation did not change significantly. Training cafeteria managers and staff members in Smarter Lunchrooms Movement techniques may be an effective way to make changes in the school cafeteria environment to encourage healthier choices among students. Additional studies allowing time for more complex changes to be implemented are needed to assess the full effect of the program.

  6. Servicios y Aplicaciones para los estudiantes de la U.V.

    OpenAIRE

    Breso Flores, Vicente

    2012-01-01

    Servicios y Aplicaciones que proporciona el SIUV a los estudiantes de la Universidad de Valencia (Correo, espacio web, blogs, disco, etc).Presentación de los servicios por Salvador Roca, director del Servei d'Informàtica de la UV.

  7. Haré un dibujo aprovechando esta nada. Aplicaciones de dibujo en freeware y opensource

    OpenAIRE

    Horcajada González, Ricardo

    2012-01-01

    Breve presentación de la tipología más común de los diferentes programas de sofware libre dedicados al dibujo que pueden encontrarse como freeware en internet. Aplicaciones y distribución de las imágenes.

  8. ELECTRODEPOSICION DE COBRE SOBRE PELICULAS ORGANICAS: APLICACIONES EN MICRO/NANOTECNOLOGIA.

    OpenAIRE

    DIP SEGOVIA, PATRICIO JOSE; DIP SEGOVIA, PATRICIO JOSE

    2007-01-01

    El presente trabajo de tesis explora la electrodeposición de cobre sobre películas orgánicas y las potenciales aplicaciones a la micro y nanotecnología. El desarrollo del trabajo experimental puede ser dividido en dos partes. En la primera se prepararon s 249p.

  9. Extracción y aplicaciones alimentarias de membranas de cáscaras de huevo

    OpenAIRE

    García Campos, Tania

    2015-01-01

    Caracterización físico-química de la membrana de la cáscara de huevo, seguida del estudio y desarollo de posibles aplicaciones de la membrana en diversos campos, entre los que destaca la formación de geles y la retención de cobre y proteínas.

  10. Extensión UML para el modelado de mapas navegacionales de aplicaciones web basado en MDA

    OpenAIRE

    Cortés Benavides, Humberto Javier

    2011-01-01

    La aparición de las arquitecturas multicapas y las arquitecturas orientadas a servicios en el proceso de desarrollo de software, ha promovido que la capa de presentación de las aplicaciones en general, y de las aplicaciones Web en particular, sea totalmente independiente del resto de las capas de una aplicación. Sin embargo, las aplicaciones Web complejas pueden tener miles de páginas enlazadas y construidas usando diferentes tecnologías. Por lo tanto, la caracterización de mapas navegacio...

  11. Effects of the cafeteria diet on the salivary glands of trained and sedentary Wistar rats=Efeitos da dieta de cafeteria sobre as glândulas salivares de ratos Wistar sedentários e treinados

    Directory of Open Access Journals (Sweden)

    Sonia Lucy Molinari

    2012-01-01

    Full Text Available The objective of this work was to study the effect of the aerobic physical training and the cafeteria diet introduced after weaning of Wistar rats and on the morphology of the main salivary glands (parotid, submandibular, sublingual. Male rats after weaning were subjected to the cafeteria diet or the standard rodent chow, and either performed aerobic physical training in a treadmill for 100 days, or did not performed any physical activity. Analyses were done considering the response in body weight, adipose tissues and salivary glands, and the data were submitted to statistical treatment (p O objetivo deste trabalho foi avaliar as características morfológicas das glândulas salivares (parótida, submandibular, sublingual apresentadas por ratos submetidos a treinamento físico aeróbio e dieta de cafeteria após o período de lactação. Ratos machos após a lactação consumiram dieta de cafeteria ou ração-padrão para roedores e realizaram treinamento físico aeróbio em esteira rolante por um período de 100 dias, ou não realizaram nenhuma atividade física. Foram feitas análises sobre a resposta do peso corporal, dos tecidos adiposos e das glândulas salivares e os dados submetidos a tratamento estatístico (p < 0,05. A análise morfológica e morfométrica das glândulas salivares foi realizada a partir de cortes histológicos corados com Hematoxilina e Eosina. Apesar do comportamento normofágico, os roedores alimentados com dieta de cafeteria apresentaram maior quantidade de gordura corporal, com repercussão sobre o peso da glândula parótida. A análise morfométrica das glândulas submandibulares indicou redução na proporção dos ácinos serosos como efeito da dieta de cafeteria e do treinamento físico. No entanto, excesso de gordura corporal, dieta de cafeteria e/ou treinamento físico não influenciou a organização histológica das glândulas salivares. Concluiu-se que as glândulas parótidas e submandibulares são mais

  12. Aplicaciones del colgajo frontonasal para la cobertura de defectos nasales

    Directory of Open Access Journals (Sweden)

    M. Pérez

    2015-12-01

    Full Text Available Presentamos una revisión retrospectiva de los pacientes a los cuales se realizó un colgajo frontonasal para la cobertura de defectos nasales intervenidos en la Unidad de Tumores Cutáneos de nuestro Servicio en el periodo comprendido entre enero de 2010 y mayo de 2014. El objetivo es analizar nuestras aplicaciones y resultados además de describir un algoritmo que permita indicar los distintos diseños en función de la localización y el tamaño del defecto a reparar. Empleamos el colgajo frontonasal en 78 pacientes (49 mujeres y 29 varones con un rango de edad de 47 a 92 años (media de 73 años. Creamos un total de 81 defectos, puesto que en 3 casos se resecaron simultáneamente 2 tumoraciones, todos de etiología tumoral (64 carcinomas basocelulares, 16 carcinomas espinocelulares y 1 caso de léntigo maligno melanoma, localizados en el área nasal, con un tamaño mínimo de 12 x 17 mm y máximo de 30 x 35 mm (media de 22 x 25 mm. El periodo de seguimiento fue de entre 2 meses y 4 años (media de 2,5 años. Respecto a las complicaciones observadas, todas ellas menores, hubo 6 casos de necrosis marginal, 8 de dehiscencia parcial de la herida y 1 de cicatrización hipertrófica, tratándose en su mayor parte de varones fumadores. Todos los colgajos sobrevivieron con resultado estético satisfactorio. El colgajo frontonasal permite la cobertura en un sólo tiempo quirúrgico de defectos nasales independientemente de su localización, de hasta 30 x 35 mm en nuestra serie. Se trata de un colgajo seguro y versátil en sus múltiples modificaciones, con unos resultados estéticos satisfactorios. Estas ventajas son de especial importancia en pacientes de edad avanzada como alternativa a técnicas más complejas. Se trata por lo tanto, a nuestro juicio, de una opción a tener en cuenta para la reconstrucción en un único tiempo quirúrgico de defectos nasales.

  13. Cafeteria diet induce changes in blood flow that are more related with heat dissipation than energy accretion

    Directory of Open Access Journals (Sweden)

    David Sabater

    2016-08-01

    Full Text Available Background. A “cafeteria” diet is a self-selected high-fat diet, providing an excess of energy, which can induce obesity. Excess of lipids in the diet hampers glucose utilization eliciting insulin resistance, which, further limits amino acid oxidation for energy. Methods. Male Wistar rats were exposed for a month to “cafeteria” diet. Rats were cannulated and fluorescent microspheres were used to determine blood flow. Results. Exposure to the cafeteria diet did not change cardiac output, but there was a marked shift in organ irrigation. Skin blood flow decreased to compensate increases in lungs and heart. Blood flow through adipose tissue tended to increase in relation to controls, but was considerably increased in brown adipose tissue (on a weight basis. Discussion. The results suggest that the cafeteria diet-induced changes were related to heat transfer and disposal.

  14. Hypercaloric cafeteria-like diet induced UCP3 gene expression in skeletal muscle is impaired by hypothyroidism

    Directory of Open Access Journals (Sweden)

    Christoffolete M.A.

    2004-01-01

    Full Text Available The uncoupling protein UCP3 belongs to a family of mitochondrial carriers located in the inner mitochondrial membrane of certain cell types. It is expressed almost exclusively at high levels in skeletal muscle and its physiological role has not been fully determined in this tissue. In the present study we have addressed the possible interaction between a hypercaloric diet and thyroid hormone (T3, which are strong stimulators of UCP3 gene expression in skeletal muscle. Male Wistar rats weighing 180 ± 20 g were rendered hypothyroid by thyroidectomy and the addition of methimazole (0.05%; w/v to drinking water after surgery. The rats were fed a hypercaloric cafeteria diet (68% carbohydrates, 13% protein and 18% lipids for 10 days and sacrificed by decapitation. Subsequently, the gastrocnemius muscle was dissected, total RNA was isolated with Trizol? and UCP3 gene expression was determined by Northern blotting using a specific probe. Statistical analysis was performed by one-way analysis of variance (ANOVA followed by the Student-Newman-Keuls post-test. Skeletal muscle UCP3 gene expression was decreased by 60% in hypothyroid rats and UCP3 mRNA expression was increased 70% in euthyroid cafeteria-fed rats compared to euthyroid chow-fed animals, confirming previous studies. Interestingly, the cafeteria diet was unable to stimulate UCP3 gene expression in hypothyroid animals (40% lower as compared to euthyroid cafeteria-fed animals. The results show that a hypercaloric diet is a strong stimulator of UCP3 gene expression in skeletal muscle and requires T3 for an adequate action.

  15. Effect of point-of-purchase calorie labeling on restaurant and cafeteria food choices: a review of the literature.

    Science.gov (United States)

    Harnack, Lisa J; French, Simone A

    2008-10-26

    Eating away from home has increased in prevalence among US adults and now comprises about 50% of food expenditures. Calorie labeling on chain restaurant menus is one specific policy that has been proposed to help consumers make better food choices at restaurants. The present review evaluates the available empirical literature on the effects of calorie information on food choices in restaurant and cafeteria settings. Computer-assisted searches were conducted using the PUBMED database and the Google Scholar world wide web search engine to identify studies published in peer-review journals that evaluated calorie labeling of cafeteria or restaurant menu items. Studies that evaluated labeling only some menu items (e.g. low calorie foods only) were excluded from the review since the influence of selective labeling may be different from that which may be expected from comprehensive labeling. Six studies were identified that met the selection criteria for this review. Results from five of these studies provide some evidence consistent with the hypothesis that calorie information may influence food choices in a cafeteria or restaurant setting. However, results from most of these studies suggest the effect may be weak or inconsistent. One study found no evidence of an effect of calorie labeling on food choices. Each of the studies had at least one major methodological shortcoming, pointing toward the need for better designed studies to more rigorously evaluate the influence of point-of-purchase calorie labeling on food choices. More research is needed that meets minimum standards of methodological quality. Studies need to include behavioral outcomes such as food purchase and eating behaviors. Also, studies need to be implemented in realistic settings such as restaurants and cafeterias.

  16. Effect of point-of-purchase calorie labeling on restaurant and cafeteria food choices: A review of the literature

    Directory of Open Access Journals (Sweden)

    French Simone A

    2008-10-01

    Full Text Available Abstract Background Eating away from home has increased in prevalence among US adults and now comprises about 50% of food expenditures. Calorie labeling on chain restaurant menus is one specific policy that has been proposed to help consumers make better food choices at restaurants. The present review evaluates the available empirical literature on the effects of calorie information on food choices in restaurant and cafeteria settings. Methods Computer-assisted searches were conducted using the PUBMED database and the Google Scholar world wide web search engine to identify studies published in peer-review journals that evaluated calorie labeling of cafeteria or restaurant menu items. Studies that evaluated labeling only some menu items (e.g. low calorie foods only were excluded from the review since the influence of selective labeling may be different from that which may be expected from comprehensive labeling. Results Six studies were identified that met the selection criteria for this review. Results from five of these studies provide some evidence consistent with the hypothesis that calorie information may influence food choices in a cafeteria or restaurant setting. However, results from most of these studies suggest the effect may be weak or inconsistent. One study found no evidence of an effect of calorie labeling on food choices. Each of the studies had at least one major methodological shortcoming, pointing toward the need for better designed studies to more rigorously evaluate the influence of point-of-purchase calorie labeling on food choices. Conclusion More research is needed that meets minimum standards of methodological quality. Studies need to include behavioral outcomes such as food purchase and eating behaviors. Also, studies need to be implemented in realistic settings such as restaurants and cafeterias.

  17. Effects on energy utilization of a beta3-adrenergic agonist in rats fed on a cafeteria diet.

    Science.gov (United States)

    Berraondo, B; Bonafonte, A; Fernandez-Otero, M P; Martinez, J A

    1997-09-01

    The antiobesity potential of a new beta3-adrenergic agonist (Trecadrine) was assessed in a cafeteria model of obesity through body composition, thermogenesis and oxygen consumption indicators. Animals fed on a cafeteria diet for 75 days increased body weight and fat content, while muscle mass as a percentage of body weight was reduced in relation to control fed rats. In addition, in vitro brown adipose tissue (BAT) and white adipose tissue (WAT) oxygen consumption was increased in these obese animals as compared with controls. Trecadrine administration reduced weight gain, BAT and WAT stores as well as the respiratory quotient, which was accompanied by an increase in WAT and BAT oxygen consumption and rectal temperature. Moreover, muscle mass as a percentage of body weight maintained the same values as non-obese animals, while an increase in absolute muscle weight was found in Trecadrine-treated obese rats. However, liver weights and in vitro oxygen consumption remained unaltered after cafeteria feeding and Trecadrine administration. Since chronic administration of Trecadrine had no effect on food intake, the stimulation of thermogenesis and oxygen consumption by the beta3-adrenergic agonist in white and brown adipose tissue are apparently responsible for the rise in energy expenditure as well as for the lower weight gain and fat deposition in obese treated rats. Thus, Trecadrine exhibits some promise as a potential treatment for obesity.

  18. Life-long Maternal Cafeteria Diet Promotes Tissue-Specific Morphological Changes in Male Offspring Adult Rats

    Directory of Open Access Journals (Sweden)

    CAROLYNE D.S. SANTOS

    Full Text Available ABSTRACT Here, we evaluated whether the exposure of rats to a cafeteria diet pre- and/or post-weaning, alters histological characteristics in the White Adipose Tissue (WAT, Brown Adipose Tissue (BAT, and liver of adult male offspring. Female Wistar rats were divided into Control (CTL; fed on standard rodent chow and Cafeteria (CAF; fed with the cafeteria diet throughout life, including pregnancy and lactation. After birth, only male offspring (F1 were maintained and received the CTL or CAF diets; originating four experimental groups: CTL-CTLF1; CTL-CAFF1; CAF-CTLF1; CAF-CAFF1. Data of biometrics, metabolic parameters, liver, BAT and WAT histology were assessed and integrated using the Principal Component Analysis (PCA. According to PCA analysis worse metabolic and biometric characteristics in adulthood are associated with the post-weaning CAF diet compared to pre and post weaning CAF diet. Thus, the CTL-CAFF1 group showed obesity, higher deposition of fat in the liver and BAT and high fasting plasma levels of glucose, triglycerides and cholesterol. Interestingly, the association between pre and post-weaning CAF diet attenuated the obesity and improved the plasma levels of glucose and triglycerides compared to CTL-CAFF1 without avoiding the higher lipid accumulation in BAT and in liver, suggesting that the impact of maternal CAF diet is tissue-specific.

  19. Emoticon use Increases Plain Milk and Vegetable Purchase in a School Cafeteria without Adversely Affecting Total Milk Purchase.

    Science.gov (United States)

    Siegel, Robert M; Anneken, Amy; Duffy, Christopher; Simmons, Kenya; Hudgens, Michelle; Kate Lockhart, Mary; Shelly, Jessica

    2015-09-01

    Choosing poor-quality foods in school cafeterias is a risk factor for childhood obesity. Given the option, children often select chocolate milk over plain white milk. Efforts to increase plain white milk selection, such as banning chocolate milk in school cafeterias, increases plain white fat-free milk (PWFFM) purchase but decreases the overall milk purchase. The purpose of this study was to determine whether emoticon placement next to healthful foods would increase healthful purchases, particularly PWFFM. In an inner city elementary school with 297 children, "Green Smiley Face" emoticons were placed to encourage the purchase of healthful foods including an entrée with whole grains, fruits, vegetables, and PWFFM. Purchase data were obtained from cash register receipts. Differences were analyzed by χ(2) Care and Statistical Process Control (SPC) and Graphical Methods. Only 7.4% of students selected white milk at baseline compared with 17.9% after the emoticons were placed (P 8 points above the mean). The addition of emoticons increases the purchase of PWFFM and vegetables in a school cafeteria setting without adversely affecting total milk sales. Emoticons offer a practical, low-cost means to improve food selection by children. Copyright © 2015 Elsevier HS Journals, Inc. All rights reserved.

  20. The effect of changes in visibility and price on fruit purchasing at a university cafeteria in Lima, Peru.

    Science.gov (United States)

    Cárdenas, María Kathia; Benziger, Catherine P; Pillay, Timesh D; Miranda, J Jaime

    2015-10-01

    To determine the effect of increasing fruit visibility, adding information and lowering price on fruit purchasing at a university cafeteria in Lima, Peru. Quasi-experimental pilot study of a three-phase stepped intervention. In Phase 1, fruit was displayed >3 m from the point of purchase with no additional information. Phase 2 consisted in displaying the fruit near the point of purchase with added health and price information. Phase 3 added a 33% price reduction. The duration of each phase was 3 weeks and phases were separated by 2-week breaks. Primary outcomes were total pieces of fruit and number of meals sold daily. A university cafeteria in Lima, Peru. Approximately 150 people, students and non-student adults, who purchased food daily. Twelve students participated in post-intervention interviews. Fruit purchasing doubled from Phase 1 to Phase 3 (Pfoods. Promoting fruit consumption by product placement close to the point of purchase, adding health information and price reduction had a positive effect on fruit purchasing in a university cafeteria, especially in males and non-student adults.

  1. Desarrollo de un conjunto de aplicaciones avanzadas para la gestión del servicio de comidas en un restaurante

    OpenAIRE

    Marsilla Fernández, Antonio T.

    2007-01-01

    Conjunto de aplicaciones multimedia y telemáticas, para gestionar el servicio de comidas de un restaurante, mediante aplicación de marcas temporales, además de gestionar las comunicaciones entre usuarios. Se compone de 3 aplicaciones principales (camarero, barra y cocina) ejecutándose en diferentes máquinas; más un conjunto de elementos complementarios. Escueal Técnica Superior de Ingeniería de Telecomunicación

  2. Dietary exposure to acrylamide from cafeteria foods in Jeddah schools and associated risk assessment.

    Science.gov (United States)

    El Tawila, Mahmoud M; Al-Ansari, Ahmed M; Alrasheedi, Amani A; Neamatallah, Abdulateef A

    2017-10-01

    Acrylamide (AA) is a carcinogenic and genotoxic food contaminant produced at high temperatures in foods that are rich in carbohydrates. Foods sold in schools in Jeddah, Saudi Arabia, are among such carbohydrate-rich foods produced at high cooking temperatures. It is crucial to determine the importance of AA exposure with respect to cafeteria foods and assess the associated risks. The highest mean AA level was measured in chocolate pies (439 µg kg -1 ), followed by custard pies (435 µg kg -1 ) and cheese pies (432 µg kg -1 ). The average and 95th percentile values of AA exposure were 0.51 and 1.17 [µg kg -1 body weight (BW) school day -1 ]. The average exposure significantly decreased with an increase in age, from 0.65 (µg kg -1 BW school day -1 ) in primary school students to 0.37 in secondary school students. Cheese and chocolate pies are the main contributors in AA intake. The contributions of cheese and chocolate pies to the average exposure among primary, middle and secondary school students were 23.1%, 24.7% and 29.4% and 16.9%, 12.1% and 11.9%, respectively. Other products with significant contributions included cheese sandwiches (10.8%, 8.9% and 12.7%), plain cookies (7.7%, 5.6% and 6.7%) and custard pies (7.7%, 4.8% and 8.9%). Other cafeteria products contributed to AA exposure at much lower percentages. The calculated margins of exposure (MOEs) for the average [356 and 614 for both benchmark dose lower confidence limit (BMDL) 0.18 and 0.31 mg kg -1 BW day -1 ] and 95th percentile AA exposure values (154 and 265 for both BMDL 0.18 and 0.31 mg kg -1 BW day -1 ) suggest that there is a health concern with respect to school-aged students. © 2017 Society of Chemical Industry. © 2017 Society of Chemical Industry.

  3. Does a grill menu redesign influence sales, nutrients purchased, and consumer acceptance in a worksite cafeteria?

    Science.gov (United States)

    Vadiveloo, Maya K; Malik, Vasanti S; Spiegelman, Donna; Willett, Walter C; Mattei, Josiemer

    2017-12-01

    Worksite cafeterias are compelling venues to improve diet quality through environmental changes. We conducted a pre-post study to evaluate how a cafeteria-initiated grill menu redesign influenced sales, revenue, and nutrient content of foods purchased. Secondly, we evaluated consumer opinions about menu changes to inform practices for worksite environment interventions. Monthly sales data (2012-2015) were used to compute gross sales and revenue of entrées and side dishes pre-post menu changes. Alternative protein sources replaced red meat; nutrient composition and nutrients purchased were compared using Food Pro software. Consumer responses were queried using online surveys; open-ended responses were analyzed using NVivo. Differences in sales and nutrient content pre-post menu redesign were tested with Wilcoxon Rank Sum tests. Gross sales of entrées (61 vs. 222 servings/month; p = 0.01) and side dishes (120 vs. 365 servings/month; p = 0.001) increased more than three-fold post-menu changes. Revenue from entrées (312 vs. 1144 USD/month; p = 0.01) and side dishes (238 vs. 914 USD/month; p = 0.001) also increased; per entrée, consumers purchased significantly more unsaturated fat (5 g), and less saturated fat (3 g) and sodium (100 mg). For side dishes, they purchased fewer calories (48 kcal) and unsaturated fat (2.9 g), but more fiber (1.8 g), and sodium (260 mg). Four themes emerged from consumer responses: the importance of 1) variety, novelty, choice; 2) cost, affordability, value; 3) health; and 4) food quality, taste. Menu redesign can improve nutrient content, while also increasing sales and revenue. Multi-dimensional assessment of the nutritional, consumer, and retailer implications is desirable practice for enacting similar environmental changes.

  4. Nudging and social marketing techniques encourage employees to make healthier food choices: a randomized controlled trial in 30 worksite cafeterias in The Netherlands.

    Science.gov (United States)

    Velema, Elizabeth; Vyth, Ellis L; Hoekstra, Trynke; Steenhuis, Ingrid H M

    2018-02-01

    Currently, many studies focus on how the environment can be changed to encourage healthier eating behavior, referred to as choice architecture or "nudging." However, to date, these strategies are not often investigated in real-life settings, such as worksite cafeterias, or are only done so on a short-term basis. The objective of this study is to examine the effects of a healthy worksite cafeteria ["worksite cafeteria 2.0" (WC 2.0)] intervention on Dutch employees' purchase behavior over a 12-wk period. We conducted a randomized controlled trial in 30 worksite cafeterias. Worksite cafeterias were randomized to either the intervention or control group. The intervention aimed to encourage employees to make healthier food choices during their daily worksite cafeteria visits. The intervention consisted of 14 simultaneously executed strategies based on nudging and social marketing theories, involving product, price, placement, and promotion. Adjusted multilevel models showed significant positive effects of the intervention on purchases for 3 of the 7 studied product groups: healthier sandwiches, healthier cheese as a sandwich filling, and the inclusion of fruit. The increased sales of these healthier meal options were constant throughout the 12-wk intervention period. This study shows that the way worksite cafeterias offer products affects purchase behavior. Situated nudging and social marketing-based strategies are effective in promoting healthier choices and aim to remain effective over time. Some product groups only indicated an upward trend in purchases. Such an intervention could ultimately help prevent and reduce obesity in the Dutch working population. This trial was registered at the Dutch Trial Register (http://www.trialregister.nl/trialreg/admin/rctview.asp?TC=5372) as NTR5372.

  5. Effect of cafeteria diet history on cue-, pellet-priming-, and stress-induced reinstatement of food seeking in female rats.

    Directory of Open Access Journals (Sweden)

    Yu-Wei Chen

    Full Text Available Relapse to unhealthy eating habits is a major problem in human dietary treatment. The individuals most commonly seeking dietary treatment are overweight or obese women, yet the commonly used rat reinstatement model to study relapse to palatable food seeking during dieting primarily uses normal-weight male rats. To increase the clinical relevance of the relapse to palatable food seeking model, here we pre-expose female rats to a calorically-dense cafeteria diet in the home-cage to make them overweight prior to examining the effect of this diet history on cue-, pellet-priming- and footshock-induced reinstatement of food seeking.Post-natal day 32 female Long-Evans rats had seven weeks of home-cage access to either chow only or daily or intermittent cafeteria diet alongside chow. Next, they were trained to self-administer normally preferred 45 mg food pellets accompanied by a tone-light cue. After extinction, all rats were tested for reinstatement induced by discrete cue, pellet-priming, and intermittent footshock under extinction conditions.Access to daily cafeteria diet and to a lesser degree access to intermittent cafeteria diet decreased food pellet self-administration compared to chow-only. Prior history of these cafeteria diets also reduced extinction responding, cue- and pellet-priming-induced reinstatement. In contrast, modest stress-induced reinstatement was only observed in rats with a history of daily cafeteria diet.A history of cafeteria diet does not increase the propensity for cue- and pellet-priming-induced relapse in the rat reinstatement model but does appear to make rats more susceptible to footshock stress-induced reinstatement.

  6. Effect of cafeteria diet history on cue-, pellet-priming-, and stress-induced reinstatement of food seeking in female rats.

    Science.gov (United States)

    Chen, Yu-Wei; Fiscella, Kimberly A; Bacharach, Samuel Z; Calu, Donna J

    2014-01-01

    Relapse to unhealthy eating habits is a major problem in human dietary treatment. The individuals most commonly seeking dietary treatment are overweight or obese women, yet the commonly used rat reinstatement model to study relapse to palatable food seeking during dieting primarily uses normal-weight male rats. To increase the clinical relevance of the relapse to palatable food seeking model, here we pre-expose female rats to a calorically-dense cafeteria diet in the home-cage to make them overweight prior to examining the effect of this diet history on cue-, pellet-priming- and footshock-induced reinstatement of food seeking. Post-natal day 32 female Long-Evans rats had seven weeks of home-cage access to either chow only or daily or intermittent cafeteria diet alongside chow. Next, they were trained to self-administer normally preferred 45 mg food pellets accompanied by a tone-light cue. After extinction, all rats were tested for reinstatement induced by discrete cue, pellet-priming, and intermittent footshock under extinction conditions. Access to daily cafeteria diet and to a lesser degree access to intermittent cafeteria diet decreased food pellet self-administration compared to chow-only. Prior history of these cafeteria diets also reduced extinction responding, cue- and pellet-priming-induced reinstatement. In contrast, modest stress-induced reinstatement was only observed in rats with a history of daily cafeteria diet. A history of cafeteria diet does not increase the propensity for cue- and pellet-priming-induced relapse in the rat reinstatement model but does appear to make rats more susceptible to footshock stress-induced reinstatement.

  7. Marked increase in rat red blood cell membrane protein glycosylation by one-month treatment with a cafeteria diet

    Directory of Open Access Journals (Sweden)

    Laia Oliva

    2015-07-01

    Full Text Available Background and Objectives. Glucose, an aldose, spontaneously reacts with protein amino acids yielding glycosylated proteins. The compounds may reorganize to produce advanced glycosylation products, which regulatory importance is increasingly being recognized. Protein glycosylation is produced without the direct intervention of enzymes and results in the loss of function. Glycosylated plasma albumin, and glycosylated haemoglobin are currently used as index of mean plasma glucose levels, since higher glucose availability results in higher glycosylation rates. In this study we intended to detect the early changes in blood protein glycosylation elicited by an obesogenic diet.Experimental Design. Since albumin is in constant direct contact with plasma glucose, as are the red blood cell (RBC membranes, we analyzed their degree or glycosylation in female and male rats, either fed a standard diet or subjected to a hyper-energetic self-selected cafeteria diet for 30 days. This model produces a small increase in basal glycaemia and a significant increase in body fat, leaving the animals in the initial stages of development of metabolic syndrome. We also measured the degree of glycosylation of hemoglobin, and the concentration of glucose in contact with this protein, that within the RBC. Glycosylation was measured by colorimetric estimation of the hydroxymethylfurfural liberated from glycosyl residues by incubation with oxalate.Results. Plasma glucose was higher in cafeteria diet and in male rats, both independent effects. However, there were no significant differences induced by sex or diet in either hemoglobin or plasma proteins. Purified RBC membranes showed a marked effect of diet: higher glycosylation in cafeteria rats, which was more marked in females (not in controls. In any case, the number of glycosyl residues per molecule were higher in hemoglobin than in plasma proteins (after correction for molecular weight. The detected levels of glucose in

  8. Exposure to a maternal cafeteria diet changes open-field behaviour in the developing offspring.

    Science.gov (United States)

    Speight, Abigail; Davey, William G; McKenna, Emily; Voigt, Jörg-Peter W

    2017-04-01

    The early postnatal period is a sensitive period in rodents as behavioural systems are developing and maturing during this time. However, little is currently known about the behavioural effects of feeding a hyper-energetic cafeteria diet (CD) during the lactational period when offspring behaviour is tested during early adolescence. To this end, 23days old offspring from dams (Wistar) fed on CD during lactation were tested in either the open-field or the elevated plus-maze for exploration and anxiety-related behaviour. On postnatal day 9, maternal behaviour and non-maternal behaviour of the dam was assessed. It was hypothesized that lactational CD feeding would reduce anxiety in the offspring. CD-fed dams had a higher energy intake, due to an overconsumption of sugars and fats. When offspring from these dams were exposed to the open field after weaning, their locomotor activity was increased. They entered the more aversive inner zone of the open-field after a shorter latency, made more entries into and spent more time in the inner zone. Anxiety-related behaviour was not affected upon exposure to the elevated plus maze, suggesting anxiolysis in the open-field only. Increased maternal licking/grooming behaviour could possibly contribute to the anxiolytic phenotype as observed in the offspring from the CD group. In conclusion, we demonstrate that lactational overfeeding impacts on the development of behaviour in the early adolescent rat. Copyright © 2016 ISDN. Published by Elsevier Ltd. All rights reserved.

  9. Radiometric analysis of cooked meal served at PINSTECH (Pakistan Institute of Nuclear Science and Technology) cafeteria

    International Nuclear Information System (INIS)

    Anjum, M.I.; Khan, K.; Jabbar, A.; Akhter, P.; Dilband, M.; Rehman, M.

    2011-01-01

    The safety of the radiation workers is one of the most essential objectives of the radiation protection department of any nuclear installation. To meet this objective, continuous monitoring and analysis of different media is performed by Health Physics Division of Pakistan Institute of Nuclear Science and Technology (PINSTECH). To find radiological impact of composite food served at PINSTECH on its workers, cooked meal samples were collected from 2008 to 2010. The radiometric analysis of these samples was performed for naturally occurring radionuclide and fission fragments. On the basis of this analysis, only K-40 was found in considerable amount. Its activity ranges from 21.35 +- 2.4 Bqkg/sup -1/ to 117.29 +- 3.01 Bqkg/sup -1/ with cumulative average value of 76.15 +- 2.85 Bqkg/sup -1/. The meals taken by the PINSTECH workers during this period give 62.67 mu Sv as committed effective dose to them which results in estimated cancer risk factor of 1.25 x 10/sup -4/ which is very small as compared to the total risk of 5 x 10/sup -3/. This shows that the food served at PINSTECH cafeteria is radiologically safe for consumers. (author)

  10. Leptin signal transduction underlies the differential metabolic response of LEW and WKY rats to cafeteria diet.

    Science.gov (United States)

    Martínez-Micaelo, N; González-Abuín, N; Ardévol, A; Pinent, M; Petretto, E; Behmoaras, J; Blay, M

    2016-01-01

    Although the effect of genetic background on obesity-related phenotypes is well established, the main objective of this study is to determine the phenotypic responses to cafeteria diet (CAF) of two genetically distinct inbred rat strains and give insight into the molecular mechanisms that might be underlying. Lewis (LEW) and Wistar-Kyoto (WKY) rats were fed with either a standard or a CAF diet. The effects of the diet and the strain in the body weight gain, food intake, respiratory quotient, biochemical parameters in plasma as well as in the expression of genes that regulate leptin signalling were determined. Whereas CAF diet promoted weight gain in LEW and WKY rats, as consequence of increased energy intake, metabolic management of this energy surplus was significantly affected by genetic background. LEW and WKY showed a different metabolic profile, LEW rats showed hyperglycaemia, hypertriglyceridemia and high FFA levels, ketogenesis, high adiposity index and inflammation, but WKY did not. Leptin signalling, and specifically the LepRb-mediated regulation of STAT3 activation and Socs3 gene expression in the hypothalamus were inversely modulated by the CAF diet in LEW (upregulated) and WKY rats (downregulated). In the present study, we show evidence of gene-environment interactions in obesity exerted by differential phenotypic responses to CAF diet between LEW and WKY rats. Specifically, we found the leptin-signalling pathway as a divergent point between the strain-specific adaptations to diet. © 2016 Society for Endocrinology.

  11. Effect of the implementation of the mixed cafeteria system in a hospital nutrition and dietetic service.

    Science.gov (United States)

    Carvalho, Kamila Pires de; Martins, Flaviana Pereira de Oliveira; Custódio, Isis Danyelle Dias; Lima, Emanuelle Do Nascimento Santos; Souza, Daniela Nogueira Prado de; Maia, Yara Cristina de Paiva

    2017-10-24

    The type of service offered by the nutrition and dietetics service (NDS) of a hospital has a direct impact on food waste. To evaluate waste in the transition from a simple to a mixed cafeteria service. The study was carried out in a NDS of a University Hospital during 60 days (30 days for each type of service). The meals prepared and distributed and the leftovers of lunch and dinner were weighed. Per capita values of non-usable leftovers were below the acceptable range (7-25 g), not varying with the service transition (p = 0.3) at lunch. At dinner, on the contrary, values were above the acceptable range, with a median of 190 g and 202 g, also showing no difference with the service modification (p = 0.5). At lunch, with the transition, there was a reduction in the plate waste-ingestion (p foods (p = 0.007). At dinner, there was a reduction in the plate waste-ingestion (p food handlers and supervisors, implementation of standardized operating procedures and cost control in order to reduce waste, which has an economic, social and political impact.

  12. Implementing healthier foodservice guidelines in hospital and federal worksite cafeterias: barriers, facilitators and keys to success.

    Science.gov (United States)

    Jilcott Pitts, S B; Graham, J; Mojica, A; Stewart, L; Walter, M; Schille, C; McGinty, J; Pearsall, M; Whitt, O; Mihas, P; Bradley, A; Simon, C

    2016-12-01

    Healthy foodservice guidelines are being implemented in worksites and healthcare facilities to increase access to healthy foods by employees and public populations. However, little is known about the barriers to and facilitators of implementation. The present study aimed to examine barriers to and facilitators of implementation of healthy foodservice guidelines in federal worksite and hospital cafeterias. Using a mixed-methods approach, including a quantitative survey followed by a qualitative, in-depth interview, we examined: (i) barriers to and facilitators of implementation; (ii) behavioural design strategies used to promote healthier foods and beverages; and (iii) how implementation of healthy foodservice guidelines influenced costs and profitability. We used a purposive sample of five hospital and four federal worksite foodservice operators who recently implemented one of two foodservice guidelines: the United States Department of Health and Human Services/General Services Administration Health and Sustainability Guidelines ('Guidelines') in federal worksites or the Partnership for a Healthier America Hospital Healthier Food Initiative ('Initiative') in hospitals. Descriptive statistics were used to analyse quantitative survey data. Qualitative data were analysed using a deductive approach. Implementation facilitators included leadership support, adequate vendor selections and having dietitians assist with implementation. Implementation barriers included inadequate selections from vendors, customer complaints and additional expertise required for menu labelling. Behavioural design strategies used most frequently included icons denoting healthier options, marketing using social media and placement of healthier options in prime locations. Lessons learned can guide subsequent steps for future healthy foodservice guideline implementation in similar settings. © 2016 The British Dietetic Association Ltd.

  13. PATRONES DE MULTICULTURALIDAD PARA EL DISEÑO DE APLICACIONES WEB

    Directory of Open Access Journals (Sweden)

    Víctor Alfonso Zapata

    2014-01-01

    Full Text Available La diversidad cultural en la Web surge como resultado del crecimiento de internet en los últimos años, logrando que los servicios y aplicaciones Web sean cada vez más utilizados por usuarios de diversas culturas, que en muchos casos terminan siendo diferentes a los usuarios iniciales en los que se basó su diseño y construcción. Este trabajo analiza las diferencias que se presentan en la comunicación multicultural a través de la Web, tomando como punto de partida las dimensiones culturales propuestas por Victor, Hofstede, Trompenaars y Hall. Se identificaron los elementos de diseño Web que están relacionados con las dimensiones culturales y su comportamiento en sitios Web representativos de Argentina, Colombia y España para finalmente construir un conjunto de Patrones de Multiculturalidad para el Diseño de Aplicaciones Web.

  14. Resinas acetálicas: diversas aplicaciones en odontoestomatología

    OpenAIRE

    Puigpelat Martí, Ana M.; Casanellas Bassols, Josep M. (Josep Maria)

    1994-01-01

    La resina acetálica o Polioxime­tileno (POM) es un nuevo material estético de reciente aplicación en el campo de la Odontoestomatolo­gía. En este artículo presentamos al­gunas de las aplicaciones donde la estética desempeña una función importante. Una de las aplicaciones de las re­sinas acetálicas es el campo de la Prótesis Parcial Removible, cuan­do queremos sustituir los retene­dores vestibulares convencionales (metálicos) por retenedores más es­téticos. Otra posible aplicación puede ser la...

  15. Elemental concentrations in kidney and liver of mice fed with cafeteria or standard diet determined by particle induced X-ray emission

    International Nuclear Information System (INIS)

    Dimer Leffa, Daniela; Iochims dos Santos, Carla Eliete; Debastiani, Rafaela; Amaral, Livio; Yoneama, Maria Lucia; Ferraz Dias, Johnny; Moraes Andrade, Vanessa

    2014-01-01

    The importance of trace elements in human health is well known and their main source is daily diet. Nowadays, one of the biggest issues is the presence of these micronutrients in levels much higher than required, leading to potential toxic effects. The aim of this work was to investigate the elemental content in organs of mice fed with cafeteria or standard diet using PIXE. Twelve male Swiss mice were divided into two groups: control group (standard chow) and cafeteria group (high-caloric diet). After 17 weeks, samples of different organs (kidney and liver) were collected and prepared for PIXE analysis. The Fe concentration in kidney and liver was statistically higher in animals that received the cafeteria diet (p < 0.001). The Al and Si kidney contents were significantly higher for cafeteria diet in relation to standard diet (p < 0.05). Moreover, the standard diet showed significant differences for Cl and K (p < 0.05) in comparison to cafeteria diet in kidney, and for P, S and Zn (p < 0.005) in liver

  16. Arquitecturas multiprocesador en HPC: software, métricas y aplicaciones

    OpenAIRE

    De Giusti, Armando Eduardo; Tinetti, Fernando Gustavo; Naiouf, Marcelo; Chichizola, Franco; De Giusti, Laura Cristina; Villagarcía Wanza, Horacio A.; Montezanti, Diego Miguel; Encinas, Diego; Pousa, Adrián; Rodriguez, Ismael Pablo; Eguren, Sebastián; Iglesias, Luciano; Paniego, Juan Manuel; Pi Puig, Martín; Dell'Oso, Matías

    2016-01-01

    Caracterizar las arquitecturas multiprocesador distribuidas enfocadas especialmente a cluster y cloud computing, con énfasis en las que utilizan procesadores de múltiples núcleos (multicores, GPUs y Xeon Phi), con el objetivo de modelizarlas, estudiar su escalabilidad, analizar y predecir performance de aplicaciones paralelas, estudiar el consumo energético y su impacto en la perfomance así como desarrollar esquemas para detección y tolerancia a fallas en las mismas. Profundizar el estudio...

  17. Desarrollo de aplicaciones Web utilizando herramientas FLOSS : Una experiencia en el CENPAT-CONICET

    OpenAIRE

    Samec, Gustavo; Mazzanti, Renato

    2008-01-01

    El proyecto tiene como objetivo evaluar distintas herramientas FLOSS, definir una arquitectura de software para el desarrollo de aplicaciones Web y realizar un desarrollo aplicando las herramientas y arquitectura seleccionada. Actualmente existen varios proyectos de ley que fomentan la utilización de herramientas FLOSS en entes estatales. Por otro lado otras instituciones de investigación científica han priorizado el uso de este tipo de herramientas [1]. Siguiendo este lineamiento, nuestra...

  18. Los diferentes tipos de hidroxiapatita y sus aplicaciones en cirugía bucal

    OpenAIRE

    Sánchez Garcés, Ma. Ángeles; Berini Aytés, Leonardo; Gay Escoda, Cosme

    1993-01-01

    Se describe las aplicaciones actuales de los diferentes tipos de hidroxiapatita en las técnicas quirúrgicas bucales practicadas con anestesia local que consisten en técnicas de tunelización subperióstica y el relleno de los defectos óseos y su aplicación combinada con implantes endo-óseos y las membranas de regeneración tisular guiada.

  19. Aplicaciones de caucho reciclado: Una revisión de la literatura

    Directory of Open Access Journals (Sweden)

    Gabriel Jaime Peláez Arroyave

    2017-01-01

    Full Text Available La generación de residuos de caucho se ha convertido en una preocupación global por su impacto negativo en el medio ambiente y en la salud humana. La legislación ambiental sobre la disposición de este tipo de residuos ha venido aumentando las exigencias a los fabricantes, comercializadores y usuarios, con lo cual se ha acelerado la búsqueda de alternativas para el reaprovechamiento de los residuos de caucho. Este artículo presenta una revisión bibliográfica acerca de las principales tendencias en la utilización del caucho reciclado, incluyendo aplicaciones actualmente comercializadas y otras derivadas tanto de estudios terminados como de líneas de investigación en desarrollo. Las aplicaciones con mayor potencial de volumen consumido son del sector infraestructura y construcciones civiles, especialmente asfaltos, concretos y materiales aislantes para construcción liviana. Algunas aplicaciones con potencial en el futuro cercano son los filtros para la limpieza de aguas contaminadas y como componente en materiales compuestos con matriz termoplástica o en poliuretano. Se evidencia la pertinencia de continuar investigando sobre esta temática, que posee unos retos científicos de alta relevancia, los cuales ameritan la mayor atención por el problema ambiental significativo asociado al manejo de los residuos de caucho.

  20. Evaluación de los Frameworks en el Desarrollo de Aplicaciones Web con Python

    Directory of Open Access Journals (Sweden)

    Jimmy Rolando Molina Ríos

    2016-09-01

    Full Text Available Debido a la creciente interacción de los usuarios con sistemas web, surge la necesidad de combinar las funcionalidades de aplicaciones clásicas de escritorio, con la accesibilidad y bajo costo de la publicación de aplicaciones web; dando origen a la elección del mejor marco de trabajo que se adopte a las necesidades de los desarrolladores. Esta investigación presenta un análisis comparativo de los frameworks que trabajan con el lenguaje Python para el desarrollo de aplicaciones web. Para ello el análisis se formuló mediante un modelo de evaluación que se basa en las características de calidad propuestas en la norma ISO/IEC 9126. Estas a su vez permiten establecer sub-características, atributos y métricas para evaluar la calidad de las aplicaciones web. Permitiendo obtener como resultado una matriz para la Evaluación de Frameworks: Django, Pyramid, Turbogear y Web2PY. Los resultados obtenidos mostraron las fortalezas y debilidades de cada framework y fue la base para determinar que Django es el mejor framework para la implementación de desarrollo de sistemas web. Este framework cumplió con todos los indicadores del modelo de evaluación, los resultados redactados al final del documento determinan que tomando en cuenta las métricas de calidad se puede elegir qué marco de trabajo es el que mejor se adapta para el desarrollo de aplicaciones web en la Ciudad de Machala. Antes de realizar una evaluación se considera indispensable conocer y comprender el funcionamiento de los elementos que se vaya a cotejar, para ello es recomendable emplear tablas para la comparación de las características, teniendo como referencia sitios web confiables que aporten documentación sobre los frameworks y el empleo de estándares de calidad para su determinación.

  1. Anti-obesity activity of chloroform-methanol extract of Premna integrifolia in mice fed with cafeteria diet

    Directory of Open Access Journals (Sweden)

    Prashant Y Mali

    2013-01-01

    Full Text Available Aim of the study: Aim of the present study was to evaluate the anti-obesity activity of chloroform:methanol extract of P. integrifolia (CMPI in mice fed with cafeteria diet. Materials and Methods: Female Swiss Albino mice were divided into six groups, which received normal and cafeteria diet, standard drug simvastatin (10 mg/kg and CMPI (50, 100 and 200 mg/kg daily for 40 days. Parameters such as body weight, body mass index (BMI, Lee index of obesity (LIO, food consumption, locomotor behavior, serum glucose, triglyceride, total cholesterol, high density lipoprotein (HDL, low density lipoprotein (LDL, very low density lipoprotein (VLDL, atherogenic index, organ weight and organ fat pad weight were studied for evaluating the anti-obesity activity of P. integrifolia. High performance liquid chromatography (HPLC fingerprint profile of chloroform-methanol extract was also studied using quercetin as the reference standard. Results: There was a significant increase in body weight, BMI, LIO, food consumption, organ weight (liver and small intestine, organ fat pad weight (mesenteric and peri-renal fat pad and in the levels of serum glucose, triglyceride, total cholesterol, LDL and VLDL with a significant decrease in locomotor behavior (ambulation, rearing, grooming and HDL level in cafeteria diet group. Animals treated with CMPI showed dose dependent activity. P. integrifolia (200 mg/kg supplementation attenuated all the above alterations, which indicates the anti-obesity activity. HPLC fingerprint profile of CMPI showed two peaks in the solvent system of 50 mm potassium diphosphate (pH-3 with ortho phosphoric acid: Methanol (30:70 v/v at 360 nm. Conclusion: Present findings suggest that, CMPI possessed anti-obesity activity that substantiated its ethno-medicinal use in the treatment of obesity.

  2. Anti-obesity activity of chloroform-methanol extract of Premna integrifolia in mice fed with cafeteria diet.

    Science.gov (United States)

    Mali, Prashant Y; Bigoniya, Papiya; Panchal, Shital S; Muchhandi, Irrappa S

    2013-07-01

    Aim of the present study was to evaluate the anti-obesity activity of chloroform:methanol extract of P. integrifolia (CMPI) in mice fed with cafeteria diet. Female Swiss Albino mice were divided into six groups, which received normal and cafeteria diet, standard drug simvastatin (10 mg/kg) and CMPI (50, 100 and 200 mg/kg) daily for 40 days. Parameters such as body weight, body mass index (BMI), Lee index of obesity (LIO), food consumption, locomotor behavior, serum glucose, triglyceride, total cholesterol, high density lipoprotein (HDL), low density lipoprotein (LDL), very low density lipoprotein (VLDL), atherogenic index, organ weight and organ fat pad weight were studied for evaluating the anti-obesity activity of P. integrifolia. High performance liquid chromatography (HPLC) fingerprint profile of chloroform-methanol extract was also studied using quercetin as the reference standard. There was a significant increase in body weight, BMI, LIO, food consumption, organ weight (liver and small intestine), organ fat pad weight (mesenteric and peri-renal fat pad) and in the levels of serum glucose, triglyceride, total cholesterol, LDL and VLDL with a significant decrease in locomotor behavior (ambulation, rearing, grooming) and HDL level in cafeteria diet group. Animals treated with CMPI showed dose dependent activity. P. integrifolia (200 mg/kg) supplementation attenuated all the above alterations, which indicates the anti-obesity activity. HPLC fingerprint profile of CMPI showed two peaks in the solvent system of 50 mm potassium diphosphate (pH-3 with ortho phosphoric acid): Methanol (30:70 v/v) at 360 nm. Present findings suggest that, CMPI possessed anti-obesity activity that substantiated its ethno-medicinal use in the treatment of obesity.

  3. Gamification of dietary decision-making in an elementary-school cafeteria.

    Directory of Open Access Journals (Sweden)

    Brooke A Jones

    Full Text Available Despite the known health benefits of doing so, most US children do not consume enough fruits and vegetables (FV. School-based interventions can be effective in increasing FV consumption, but the most effective of these require that schools allocate their time, effort, and financial resources to implementing the program: expenditures that schools may be reluctant to provide in climates of academic accountability and economic austerity. The present demonstration project used a behaviorally based gamification approach to develop an intervention designed to increase FV consumption while minimizing material and labor costs to the school. During the intervention, the school (N = 180 students in grades K-8 played a cooperative game in which school-level goals were met by consuming higher-than-normal amounts of either fruit or vegetables (alternating-treatments experimental design. School-level consumption was quantified using a weight-based waste measure in the cafeteria. Over a period of 13 school days, fruit consumption increased by 66% and vegetable consumption by 44% above baseline levels. Use of an alternating-treatment time-series design with differential levels of FV consumption on days when fruit or vegetable was targeted for improvement supported the role of the intervention in these overall consumption increases. In post-intervention surveys, teachers rated the intervention as practical in the classroom and enjoyed by their students. Parent surveys revealed that children were more willing to try new FV at home and increased their consumption of FV following the intervention. These findings suggest that a behaviorally based gamification approach may prove practically useful in addressing concerns about poor dietary decision-making by children in schools.

  4. Gamification of dietary decision-making in an elementary-school cafeteria.

    Science.gov (United States)

    Jones, Brooke A; Madden, Gregory J; Wengreen, Heidi J; Aguilar, Sheryl S; Desjardins, E Anne

    2014-01-01

    Despite the known health benefits of doing so, most US children do not consume enough fruits and vegetables (FV). School-based interventions can be effective in increasing FV consumption, but the most effective of these require that schools allocate their time, effort, and financial resources to implementing the program: expenditures that schools may be reluctant to provide in climates of academic accountability and economic austerity. The present demonstration project used a behaviorally based gamification approach to develop an intervention designed to increase FV consumption while minimizing material and labor costs to the school. During the intervention, the school (N = 180 students in grades K-8) played a cooperative game in which school-level goals were met by consuming higher-than-normal amounts of either fruit or vegetables (alternating-treatments experimental design). School-level consumption was quantified using a weight-based waste measure in the cafeteria. Over a period of 13 school days, fruit consumption increased by 66% and vegetable consumption by 44% above baseline levels. Use of an alternating-treatment time-series design with differential levels of FV consumption on days when fruit or vegetable was targeted for improvement supported the role of the intervention in these overall consumption increases. In post-intervention surveys, teachers rated the intervention as practical in the classroom and enjoyed by their students. Parent surveys revealed that children were more willing to try new FV at home and increased their consumption of FV following the intervention. These findings suggest that a behaviorally based gamification approach may prove practically useful in addressing concerns about poor dietary decision-making by children in schools.

  5. Cafeteria diet-induced obesity causes oxidative damage in white adipose.

    Science.gov (United States)

    Johnson, Amy R; Wilkerson, Matthew D; Sampey, Brante P; Troester, Melissa A; Hayes, D Neil; Makowski, Liza

    2016-04-29

    Obesity continues to be one of the most prominent public health dilemmas in the world. The complex interaction among the varied causes of obesity makes it a particularly challenging problem to address. While typical high-fat purified diets successfully induce weight gain in rodents, we have described a more robust model of diet-induced obesity based on feeding rats a diet consisting of highly palatable, energy-dense human junk foods - the "cafeteria" diet (CAF, 45-53% kcal from fat). We previously reported that CAF-fed rats became hyperphagic, gained more weight, and developed more severe hyperinsulinemia, hyperglycemia, and glucose intolerance compared to the lard-based 45% kcal from fat high fat diet-fed group. In addition, the CAF diet-fed group displayed a higher degree of inflammation in adipose and liver, mitochondrial dysfunction, and an increased concentration of lipid-derived, pro-inflammatory mediators. Building upon our previous findings, we aimed to determine mechanisms that underlie physiologic findings in the CAF diet. We investigated the effect of CAF diet-induced obesity on adipose tissue specifically using expression arrays and immunohistochemistry. Genomic evidence indicated the CAF diet induced alterations in the white adipose gene transcriptome, with notable suppression of glutathione-related genes and pathways involved in mitigating oxidative stress. Immunohistochemical analysis indicated a doubling in adipose lipid peroxidation marker 4-HNE levels compared to rats that remained lean on control standard chow diet. Our data indicates that the CAF diet drives an increase in oxidative damage in white adipose tissue that may affect tissue homeostasis. Oxidative stress drives activation of inflammatory kinases that can perturb insulin signaling leading to glucose intolerance and diabetes. Copyright © 2016 Elsevier Inc. All rights reserved.

  6. Effects of palatable cafeteria diet on cognitive and noncognitive behaviors and brain neurotrophins' levels in mice.

    Science.gov (United States)

    Leffa, Daniela D; Valvassori, Samira S; Varela, Roger B; Lopes-Borges, Jésica; Daumann, Francine; Longaretti, Luiza M; Dajori, Ana Luiza F; Quevedo, João; Andrade, Vanessa M

    2015-08-01

    The consumption of palatable high-fat and high-sugar foods have increased dramatically over the past years. Overconsumption of calorically dense food contributes to increasing rates of overweight and obesity that are associated with psychiatry disorders, in particular mood and anxiety disorders. This study evaluated the impact of palatable cafeteria diet (CAF) intake on cognitive and noncognitive behaviors, as well as identified factors related to these behaviors through an evaluation of brain neurotrophic factor (BDNF, NGF, and GDNF) levels in hippocampus of mice. Male Swiss mice received two different diets during 13 weeks: standard chow (STA) and highly CAF. Posteriorly, forced swimming test (FST), tail suspension test (TST), plus-maze test (PMT), open-field tests (OFT), and object recognition task (ORT) were utilized as behavioral tests. In addition, brain-derived neurotrophic factor (BDNF), glial cell line-derived neurotrophic factor (GDNF), and nerve growth factor (NGF) neurotrophins' levels were evaluated in hippocampus of mice. The results demonstrated that mice from the CAF group showed a decrease in the immobility time in the FST and TST. Besides, mice in the CAF group spent more time in the open arms of the PMT. No significant differences were observed in the cognitive behaviors, which were evaluated in the OFT and ORT. In addition, the CAF group showed that BDNF and NGF protein levels increased in the hippocampus of mice. In conclusion, our data suggest that the consumption of palatable high-fat and high-sugar foods induces antidepressant- and anxiolytic-like behaviors, which can be related with BDNF and NGF expression increases in hippocampus of mice in the CAF group.

  7. Gamification of Dietary Decision-Making in an Elementary-School Cafeteria

    Science.gov (United States)

    Jones, Brooke A.; Madden, Gregory J.; Wengreen, Heidi J.; Aguilar, Sheryl S.; Desjardins, E. Anne

    2014-01-01

    Despite the known health benefits of doing so, most US children do not consume enough fruits and vegetables (FV). School-based interventions can be effective in increasing FV consumption, but the most effective of these require that schools allocate their time, effort, and financial resources to implementing the program: expenditures that schools may be reluctant to provide in climates of academic accountability and economic austerity. The present demonstration project used a behaviorally based gamification approach to develop an intervention designed to increase FV consumption while minimizing material and labor costs to the school. During the intervention, the school (N = 180 students in grades K-8) played a cooperative game in which school-level goals were met by consuming higher-than-normal amounts of either fruit or vegetables (alternating-treatments experimental design). School-level consumption was quantified using a weight-based waste measure in the cafeteria. Over a period of 13 school days, fruit consumption increased by 66% and vegetable consumption by 44% above baseline levels. Use of an alternating-treatment time-series design with differential levels of FV consumption on days when fruit or vegetable was targeted for improvement supported the role of the intervention in these overall consumption increases. In post-intervention surveys, teachers rated the intervention as practical in the classroom and enjoyed by their students. Parent surveys revealed that children were more willing to try new FV at home and increased their consumption of FV following the intervention. These findings suggest that a behaviorally based gamification approach may prove practically useful in addressing concerns about poor dietary decision-making by children in schools. PMID:24718587

  8. Cafeteria diet overfeeding in young male rats impairs the adaptive response to fed/fasted conditions and increases adiposity independent of body weight.

    Science.gov (United States)

    Castro, H; Pomar, C A; Picó, C; Sánchez, J; Palou, A

    2015-03-01

    We analyzed the effects of a short exposure to a cafeteria diet during early infancy in rats on their metabolic response to fed/fasting conditions in key tissues involved in energy homeostasis. Ten-day-old male pups were fed a control or a cafeteria diet for 12 days and then killed under ad libitum feeding conditions or 12 h fasting. The expression of key genes related to energy metabolism in liver, retroperitoneal white adipose tissue (WAT) and hypothalamus were analyzed. Despite no differences in body weight, cafeteria-fed animals had almost double the fat mass of control rats. They also showed higher food intake, higher leptinemia and altered hypothalamic expression of Neuropetide Y, suggesting a dysfunction in the control of food intake. Unlike controls, cafeteria-fed animals did not decrease WAT expression of Pparg, sterol regulatory element binding transcription factor 1 or Cidea under fasting conditions, and displayed lower Pnpla2 expression than controls. In liver, compared with controls, cafeteria animals presented: (i) lower expression of genes related with fatty acid uptake and lipogenesis under ad libitum-fed conditions; (ii) higher expression of fatty acid oxidation-related genes and glucokinase under fasting conditions; (iii) greater expression of leptin and insulin receptors; and higher protein levels of insulin receptor and the pAMPK/AMPK ratio. A short period of exposure to a cafeteria diet in early infancy in rat pups is enough to disturb the metabolic response to fed/fasting conditions in key tissues involved in energy homeostasis, particularly in WAT, and hence induces an exacerbated body fat accumulation and increased metabolic risk, with no apparent effects on body weight.

  9. miCole, Social Media for Schools: Estudio de tecnologías para el desarrollo de aplicaciones móviles híbridas.

    OpenAIRE

    Bárcena Díez, Jaime

    2017-01-01

    El objetivo de este proyecto consiste en dar al lector una visión global sobre los diferentes tipos de aplicaciones para dispositivos móviles según su forma de desarrollo. Grado en Ingeniería Informática de Servicios y Aplicaciones

  10. Performance of Layers Supplemented with Either Complete Feed or Diets in Cafeteria Feeding System Under Semi-scavenging Condition in a Tropical Environment

    OpenAIRE

    Das, Chamali; Roy, Bimol Chandra; Ranvig, Hans; Riise, Jens Christian; Chowdhury, Sachchidananda Das; Iwamoto, Hisao; Tabata, Shoji

    2008-01-01

    1. Egg production ability and its economical aspect were compared among the hens kept under semi-scavenging condition on two feeding systems with four supplementary levels. Commercial balanced feed and cafeteria feeding diet were fed the hens at 40 g, 60 g, 80 g and 120 g/day respectively. Cafeteria feeding diet was composed of 70% mixed feed (40% broken rice, 20% rice polish and 10% wheat bran), 27% soybean meal and 3% oyster shell. 2. The mean feed residue was 4-8 g/day in the hens fed 40...

  11. Strategies for Reducing Energy Consumption in a Student Cafeteria in a Hot-Humid Climate: A Case Study

    Directory of Open Access Journals (Sweden)

    Mohammed Alhaji Mohammed

    2013-03-01

    Full Text Available Increasing attention is being given to energy consumption and potential for energy savings in public buildings in order to improve energy performance. Due to their size and functional requirements, public buildings especially cafeteria facilities tend to consume a significant amount of energy. Furthermore, due to their operational characteristics and construction pattern, unnecessary energy is likely to be used for maintaining acceptable indoor environmental quality. In this study, a student cafeteria at King Fahd University of Petroleum and Minerals, Saudi Arabia, was selected for the assessment of its energy performance and potential energy conservation opportunities. Energy simulation software Visual DOE 4.1 was used to develop an energy performance model for assessing various energy conservation measures pertinent to the building envelope and HVAC system design. Data required for setting up the model were gathered through simple energy audits. The architectural and mechanical drawings and the history of electrical consumption were collected. Various energy conservation strategies were then implemented including standards, single and combined energy conservation measures. These measures resulted in a combined design saving of 27.4%, the HVAC system saving 10.6%, implementation of standards saving about 16.7%, lighting 6.6%, equipment 2.6%, insulation 2.5% and glazing 1.4%. Based on these results, it is apparent that there is a significant potential for improving energy performance and justification to employ the suggested measures for achieving substantial energy savings and minimize energy consumption.

  12. Effects of cafeteria diet and high fat diet intake on anxiety, learning and memory in adult male rats.

    Science.gov (United States)

    Pini, Renata Tavares Beschizza; Ferreira do Vales, Lucas Duarte Manhas; Braga Costa, Telma Maria; Almeida, Sebastião Sousa

    2017-09-01

    The effects of cafeteria and high fat diets were investigated on animal models of behavior. Male Wistar rats were treated with Control (C), Cafeteria (CD) and High Fat (FD) diets and tested in the Elevated Plus-Maze (EPM) and Morris Water Maze (MWM) procedures. Body weight, length, abdominal circumference, retroperitoneal and epididymal adipose tissues were recorded. Physical parameters, weight of tissues, EPM, and MWM data were subjected to ANOVA followed by Newman-Keuls test (P < 0.05). There were no differences on weight and length parameters between CD and C rats up to 98 days of age. However, abdominal circumferences were higher in CD as compared to C at 35 and 70 days of age, respectively, the 5th and the 7th weeks. FD presented lower measures of weight and abdominal circumference; nevertheless there was an increase on those parameters at the end of the nutritional treatment. Even without an apparent weight gain of CD and FD these animals presented a greater accumulation of retroperitoneal and epididymal adipose tissues. In addition, CD and FD demonstrated behaviors that can suggest lower anxiety. CD showed a better learning performance and FD showed better recall of previous learned information in the memory retention test. According to those data it was concluded that hypercaloric diet ingestion was capable of triggering metabolic alterations and possibly lowering anxiety associated to learning or memory improvement on a spatial task.

  13. Posibilidades de las aplicaciones móviles para el abordaje de la obesidad según los profesionales

    OpenAIRE

    Alicia Aguilar-Martínez; Elena Tort; F. Xavier Medina; Francesc Saigí-Rubió

    2015-01-01

    Introducción: Ante el creciente aumento y la relevancia que han adquirido las aplicaciones para teléfonos móviles (App) en el ámbito de la salud, el objetivo de este trabajo es conocer la visión de los profesionales que se dedican al tratamiento de la obesidad sobre las necesidades y carencias actuales con las que se encuentran, su predisposición al uso de dichas aplicaciones y las funcionalidades que creen que debería tener una aplicación de móvil para el tratamiento de la obesidad. Métod...

  14. Aplicaciones de los métodos computacionales al estudio de la estructura y propiedades de polímeros

    OpenAIRE

    Alemán,Carlos; Muñoz-Guerra,Sebastián

    2003-01-01

    En este trabajo se revisan las técnicas de simulación molecular más habituales y potentes para la descripción de los polímeros a escala atómica y molecular, las cuales se han clasificado en cuánticas o clásicas dependiendo de cómo se describen las interacciones entre las partículas. Se presentan asimismo diversas aplicaciones de dichas metodologías, realizadas en nuestro laboratorio, en el contexto del estudio de la estructura y propiedades de polímeros. En particular, se muestran aplicacione...

  15. CartoDB: Una base de datos geoespacial para el desarrollo fácil de aplicaciones web

    OpenAIRE

    Torre Alonso, Javier de la; Álvarez Leiva, Sergio; Santana, Javier

    2012-01-01

    CartoDB es una base de datos geoespacial Open Source. Internamente funciona con PostGIS, Node.js y Mapnik. CartoDB proporciona una interfaz para importar y visualizar datos geoespaciales y una serie de APIs para acceder a los datos mediante sentencias SQL y Tiles. CartoDB puede ser utilizado para múltiples tipos de aplicaciones y visualizaciones online, desde aplicaciones móviles, visualizaciones online, portales geoespaciales y prácticamente cualquier tipo de aplicación geoespacial. CartoDB ...

  16. Procedimiento para obtener un producto prebiótico de alto contenido en fibra soluble, dicho producto y sus aplicaciones

    OpenAIRE

    Rupérez Antón, Pilar; Mateos-Aparicio, Inmaculada

    2008-01-01

    Procedimiento para obtener un producto prebiótico de alto contenido en fibra soluble, dicho producto y sus aplicaciones. La presente invención describe un procedimiento para obtener un producto prebiótico de alto contenido en fibra soluble a partir del uso de fibra insoluble proveniente de residuos vegetales y de la aplicación de altas presiones. Así sus aplicaciones son como suplemento dietético natural rico en fibra en alimentos utilizándose a residuos de soja, subpr...

  17. Impact of a cafeteria diet and daily physical training on the rat serum metabolome.

    Directory of Open Access Journals (Sweden)

    Susana Suárez-García

    Full Text Available Regular physical activity and healthy dietary patterns are commonly recommended for the prevention and treatment of metabolic syndrome (MetS, which is diagnosed at an alarmingly increasing rate, especially among adolescents. Nevertheless, little is known regarding the relevance of physical exercise on the modulation of the metabolome in healthy people and those with MetS. We have previously shown that treadmill exercise ameliorated different symptoms of MetS. The aim of this study was to investigate the impact of a MetS-inducing diet and different intensities of aerobic training on the overall serum metabolome of adolescent rats. For 8 weeks, young rats were fed either standard chow (ST or cafeteria diet (CAF and were subjected to a daily program of training on a treadmill at different speeds. Non-targeted metabolomics was used to identify changes in circulating metabolites, and a combination of multivariate analysis techniques was implemented to achieve a holistic understanding of the metabolome. Among all the identified circulating metabolites influenced by CAF, lysophosphatidylcholines were the most represented family. Serum sphingolipids, bile acids, acylcarnitines, unsaturated fatty acids and vitamin E and A derivatives also changed significantly in CAF-fed rats. These findings suggest that an enduring systemic inflammatory state is induced by CAF. The impact of physical training on the metabolome was less striking than the impact of diet and mainly altered circulating bile acids and glycerophospholipids. Furthermore, the serum levels of monocyte chemoattractant protein-1 were increased in CAF-fed rats, and C-reactive protein was decreased in trained groups. The leptin/adiponectin ratio, a useful marker of MetS, was increased in CAF groups, but decreased in proportion to training intensity. Multivariate analysis revealed that ST-fed animals were more susceptible to exercise-induced changes in metabolites than animals with MetS, in which

  18. Social jet-lag potentiates obesity and metabolic syndrome when combined with cafeteria diet in rats.

    Science.gov (United States)

    Espitia-Bautista, Estefania; Velasco-Ramos, Mario; Osnaya-Ramírez, Iván; Ángeles-Castellanos, Manuel; Buijs, Ruud M; Escobar, Carolina

    2017-07-01

    Modern lifestyle promotes shifted sleep onset and shifted wake up time between weekdays and weekends, producing a condition termed "social-jet lag." Disrupted sleep promotes increased appetite for carbohydrate and fat-rich food, which in long term leads to overweight, obesity and metabolic syndrome. In order to mimic the human situation we produced an experimental model of social-jet lag (Sj-l). With this model, we explored the link between shifted sleep time with consumption of a cafeteria diet (CafD) and the development of obesity and metabolic syndrome. The first experiment was designed to create and confirm the model of Sj-l. Rats (n=8-10/group) were exposed to a shifted sleep time protocol achieved by placing the rats in slow rotating wheels from Monday to Friday during the first 4h of the light period, while on weekends they were left undisturbed. The second experiment (n=8-12/group) explored the combined effect of Sj-l with the opportunity to ingest CafD. All protocols lasted 12weeks. We evaluated the development of overweight and indicators of metabolic syndrome. The statistical significance for all variables was set at P<0.05. Sj-l alone did not affect body weight gain but induced significant changes in cholesterol in metabolic variables representing a risk factor for metabolic syndrome. Daily restricted access to CafD in the day or night induced glucose intolerance and only CafD during the day led to overweight. Sj-l combined with CafD induced overconsumption of the diet, potentiated body weight gain (16%) and promoted 5 of the criteria for metabolic syndrome including high insulin and dislipidemia. Present data provide an experimental model of social-jet lag that combined with overconsumption of CafD, and maximized the development of obesity and metabolic syndrome. Importantly, access to CafD during the night did not lead to overweight nor metabolic syndrome. Copyright © 2017 Elsevier Inc. All rights reserved.

  19. A physiological characterization of the Cafeteria diet model of metabolic syndrome in the rat.

    Science.gov (United States)

    Gomez-Smith, Mariana; Karthikeyan, Sudhir; Jeffers, Matthew S; Janik, Rafal; Thomason, Lynsie A; Stefanovic, Bojana; Corbett, Dale

    2016-12-01

    Many promising findings from pre-clinical research have failed to translate to the clinic due to their inability to incorporate human disease co-morbidity. A variety of rodent diets and feeding durations are currently used in models of human metabolic syndrome, obesity and diabetes. One model, the Cafeteria (CAF) diet, makes use of grocery store-purchased food items that more closely approximate the human ultra-processed diet than commercial high-fat or high-sugar rodent diets. The present study describes the development of metabolic syndrome in rats fed a CAF diet as well as the recovery of metabolic syndrome following a healthy "lifestyle" change. In addition, we explored the effects of CAF diet on spatial learning and memory and on neuroinflammation. Three-week old male Sprague-Dawley rats were fed a CAF diet for three months that consisted of 16 highly palatable human food items along with standard chow and a 12% sucrose solution to mimic soda consumption. Thereafter, a sub-group of CAF diet rats was switched to a chow diet (SWT) for one month. Both CAF and SWT groups were compared to control rats maintained on a standard chow diet (SD). Prior to the diet switch, CAF and SWT animals developed features akin to metabolic syndrome. Both groups of rats displayed significant abdominal obesity with increased visceral adiposity, hyperinsulinemia, glucose intolerance and dyslipidemia with elevated serum triglyceride levels and reduced HDL cholesterol. Switching to a chow diet for one month completely reversed these features in SWT animals. Although acquisition of the Barnes maze was not affected by the CAF diet, these animals exhibited greater hippocampal neuroinflammation compared to both SD and SWT rats as assessed by Iba1 staining. These results demonstrate that the CAF diet is very effective in creating metabolic syndrome with hippocampal inflammation in rats over a relatively short time span. This model may be of great heuristic importance in determining potential

  20. Anticuerpo anti-Dectin-1 humano, hibridoma productor de dicho anticuerpo y sus aplicaciones

    OpenAIRE

    Llorente Gómez, María de las Mercedes; Fernández Ruíz, Elena; Galán Díez, Marta; Kremer, Leonor; Casasnovas, José María

    2008-01-01

    Anticuerpo anti-Dectin-1 humano, hibridoma productor de dicho anticuerpo y sus aplicaciones. La presente invención consiste en el hibridoma MGD3 y el anticuerpo monocional producido por él (denominado también MGD3), que reconoce de forma especifica al receptor de membrana Decti-1 humano. El anticuerpo MGD3 es capaz de inhibir la unión de Dectin-1 a su ligando natural, los -glucanos que son componentes de la pared de los hongos. Además, bloquea específicamente la un...

  1. El láser CO2 y sus aplicaciones en oftalmología veterinaria

    OpenAIRE

    Torrubia, I.

    2012-01-01

    El LASER (Light Amplification by Stimulated Emision of Radiation) es una fuente de energía descubierta a finales de los años 50 que se emplea en multitud de campos y que ha evolucionado constantemente desde entonces, obteniéndose multitud de tipos de láser en función de la longitud de onda con la que se trabaje. Este gran avance no puede dejar de tener sus aplicaciones en la medicina. Este artículo hace una referencia básica sobre los diferentes tipos de láser y sus características, tratando ...

  2. Desarrollo integral de aplicaciones domóticas: una perspectiva metodológica.

    OpenAIRE

    Rosique Contreras, María Francisca

    2012-01-01

    [SPA] Los rápidos avances en electrónica, informática y tecnologías de la comunicación (Solé, 2003.) (Que conduce a la miniaturización y mejora del rendimiento de los ordenadores, sensores y redes) han dado lugar al desarrollo de nuevas tecnologías en el campo de la domótica (Espinoza, 2011). Las aplicaciones domóticas integran funciones de confort, ahorro energético, seguridad y comunicaciones. El objetivo principal de estos sistemas es dotar a las viviendas de un cierto grado de inteligenci...

  3. DESARROLLO DE APLICACIONES DE ESCRITORIO HÍBRIDAS CON JAVASCRIPT, CSS Y HTML

    OpenAIRE

    Sampedro Guamán, Carlos Roberto; Machuca Vivar, Silvio Amable; Patrón Sabando, Edison Israel

    2016-01-01

    RESUMENLas aplicaciones de escritorio híbridas se desarrollan con lenguajes propios de las webapps: Javascript, CSS y HTML, siendo estas una combinación de la app nativa y web app incluyendo las mejores características de cada una de ellas, por lo que permiten su uso en diferentes plataformas. El análisis fue realizado con el app runtime NW.js y el Node.js con el que se puede acceder al hardware, sistemas de archivos, y redes funcionales; facultando su uso en una amplia gama de campos, desde ...

  4. Sistemas diferenciales-algebraicos: aplicaciones a perturbación singular y control

    OpenAIRE

    Etchechoury, María del Rosario

    2001-01-01

    Los Sistemas Diferenciales Algebraicos (SDA) son también conocidos como sistemas singulares, implícitos, descriptores o sistemas generalizados. Surgen naturalmente como modelos dinámicos de aplicaciones de la ingeniería (tales como redes de circuitos eléctricos [1], sistemas de potencia [2], sistemas mecánicos con restricciones [3], ingeniería aeroespacial [4] y procesos químicos [5]); se utilizan también para modelar sistemas sociales, sistemas económicos, sistemas biológicos; etc. En ...

  5. OPTIMIZACION DE LA MORFOLOGIA DE ELECTRO-DEPOSITOS DE POLITIOFENO, CON VISTA A SUS POSIBLES APLICACIONES

    OpenAIRE

    GACITUA SANTALICES, MANUEL ALEJANDRO; GACITUA SANTALICES, MANUEL ALEJANDRO

    2012-01-01

    El impactante número de investigaciones relacionadas con los polímeros conductores, seguramente se explica por las mismas razones que justificaron el Premio Nobel a sus descubridores el primer año de este milenio: su enorme impacto social, por su gran diversidad de aplicaciones, algunas de las cuales ya se concretan, mientras otras son todavía incipientes, o sólo se vislumbran por parte de algunos visionarios. En todo caso, los principales desafíos actuales en el área los co...

  6. Textos y aplicaciones digitales para el desarrollo de la competencia literaria infantil y juvenil

    OpenAIRE

    Mendiola Oñate, Pedro Javier

    2015-01-01

    La evolución de las tecnologías de la información y la comunicación, por un lado, y la expansión de los dispositivos móviles de consumo de contenidos digitales, por otro, son realidades de la sociedad actual a las que las empresas editoriales han dejado de ser ajenas. Cada vez son más los títulos disponibles en formato digital (pdf, pdf enriquecido, e-pub, etc.) en los catálogos editoriales y las aplicaciones para tabletas y teléfonos inteligentes en las plataformas (Appstore, Amazon, Google ...

  7. Estudio del estado del arte de las tecnologías de desarrollo para aplicaciones web

    OpenAIRE

    Melero Villamuza, Elena

    2016-01-01

    El objetivo principal de este Trabajo Fin de Grado es la realización de una revisión del estado del arte de diversas tecnologías utilizadas en el desarrollo de aplicaciones web, así como la generación de contenidos y la implementación de una batería de ejemplos prácticos para utilizar como apoyo a la docencia en asignaturas que abordan estas tecnologías. En particular, se realiza un estudio del posicionamiento web o SEO, analizando las diferentes técnicas de desarrollo web que se utiliza...

  8. Diseño de aplicaciones SaaS sobre plataformas de Cloud Computing

    OpenAIRE

    Nieto, Emiliano

    2013-01-01

    Cloud computing es un modelo de computación que permite demandar a través de internet recursos compartidos como procesamiento en servidores, almacenamiento, aplicaciones y servicios, los cuales pueden ser rápidamente aprovisionados y liberados sin ningún esfuerzo de administración por parte del proveedor de éstos servicios. Los tres servicios esenciales de Cloud Computing son Infraestructura como Servicio (IaaS), Plataforma como Servicio (PaaS) y Software como Servicio (SaaS). El presen...

  9. Los costos de la calidad: conceptos y aplicaciones en la industria farmacéutica

    OpenAIRE

    Enrique Yacuzzi; Fernando Martín

    2003-01-01

    Este documento de trabajo es una introducción práctica al estudio de los costos de la calidad (CC). En las primeras secciones se describen algunos métodos y aplicaciones sencillas. Utilizando ejemplos de la implantación de un sistema de CC en el área de acondicionamiento de un laboratorio farmacéutico multinacional que opera en la Argentina, se presentan definiciones y cálculos de costos, con ejemplos de los informes y planillas más comunes. Se estudia la clasificación de los costos y se brin...

  10. Una comparación de metodologías para el modelado de aplicaciones web

    OpenAIRE

    Cristián Rioseco Reinoso; Rodolfo Villarroel Acevedo

    2012-01-01

    Dentro de la ingeniería web se han desarrollado una serie de metodologías para el modelado de aplicaciones web que apuntan a resolver distintos problemas existentes en el desarrollo de este tipo de software. Tanto para los investigadores, como para desarrolladores de software no es trivial identificar y conocer las diferencias entre una y otra metodología por el gran número de propuestas existentes y la complejidad de ellas. En vista de esto, este artículo expone criterios transversales y cri...

  11. Aplicaciones del Caos y la Complejidad en la Cadena de Suministros del Sector Agroindustrial

    OpenAIRE

    Lara Atencia, Manuel Santiago

    2016-01-01

    La presente investigación consiste en determinar las aplicaciones existentes de las teorías del caos y las teorías de la complejidad en la cadena de suministro del sector agroindustrial colombiano. Además, tiene como propósito describir el sector de la agroindustria y la cadena de suministro, identificar los modelos de caos y complejidad y posteriormente determinar cuáles de éstos son aplicables al sector. Se define el caos como una sub-disciplina de las matemáticas que estudia sistemas compl...

  12. Diseño de un profile para el modelado de aplicaciones paralelas y concurrentes

    OpenAIRE

    Giulianelli, Daniel Alberto; Rodríguez, Rocío Andrea; Vera, Pablo Martín; Fernández, Victor

    2009-01-01

    UML es un lenguaje de representación de amplio propósito general, el cual para tal fin cuenta con vocabulario gráfico. En algunos casos cuando se quiere modelar un tipo de aplicación particular el vocabulario gráfico de UML resulta ser muy reducido. Por esta razón es necesario extender el lenguaje con nuevos artefactos que permitan modelar las características particulares del dominio en cuestión. El equipo de investigación trabaja con aplicaciones paralelas las cuales poseen procesos concurre...

  13. Aplicaciones de la Estimulación Eléctrica Neuromuscular

    OpenAIRE

    San Juan, Alejandro F.; Pérez Ruiz, Margarita

    2003-01-01

    El concepto electroestimulación no es nuevo, y los fisioterapeutas lo han empleado clurante años en aplicaciones clínicas. La electroestimulación suele comprender la estimulación de los músculos con impulsos eléctricos gracias a almohadillas húmedas con electrodos pegados firmemente a la piel. Se efectúa en este artículo una revisión bibliográfica del tema. No data (2003) UEM

  14. PROGRAMACIÓN AVANZADA CON DERIVE®. APLICACIONES AL ÁLGEBRA LINEAL

    Directory of Open Access Journals (Sweden)

    Iván Castro Chadid

    2001-06-01

    Full Text Available En este artículo, el autor logra construir una serie de procedimientos que permiten resolver seis problemas prácticos pero a la vez de suma utilidad en Álgebra Lineal y sus aplicaciones. Aprovechando la enormeversatilidad que ofrece el programa de álgebra computacional DERIVE®, y las ideas que aportan algunos métodos de demostración de estas propiedades, logra un equilibrio entre la síntesis y la eficiencia dedichos programas.

  15. PREPARACIÓN ELECTROQUÍMICA DE CAPAS NANOESTRUCTURADAS DE ZnO PARA APLICACIONES FOTOVOLTAICA

    OpenAIRE

    Moya Forero, Mónica Mercedes

    2012-01-01

    En esta tesis se centra en el estudio de capas delgadas basadas en óxido de zinc (ZnO) para aplicaciones fotovoltaicas, en concreto células solares sensibilizadas con colorante (DSSC). Se optimizaron los parámetros de crecimiento de estas nanoestructuras hibridas depositadas mediante la técnica de electrodeposición catódica para posteriormente desarrollar un dispositivo eficiente para la conversión de la luz. OBJETIVOS Los objetivos principales de la tesis son: - Establecer las co...

  16. Aplicaciones de la tecnologia de control termico y de madurez del concreto en Colombia

    OpenAIRE

    Quimbay Herrera, Rodrigo

    2009-01-01

    La Tecnología del control térmico y de madurez del concreto (TCTM) tiene un potencial muy amplio en la industria del cemento y del concreto en Colombia, tanto por sus múltiples aplicaciones en los procesos de control de calidad en obra (instrumentación de elementos, control de probetas), como en el control de calidad de recepción en planta para la materia prima (control en tiempo real del cemento). Igualmente, en el control de producción de las diferentes mezclas (e...

  17. Nanomateriales de carbono, síntesis, funcionalización y aplicaciones

    OpenAIRE

    González Velázquez, Viviana Jehová

    2016-01-01

    Mención Internacional en el título de doctor La presente tesis trata acerca del estudio y la búsqueda de aplicaciones de nanomateriales de carbono, principalmente enfocándonos en nanotubos de carbono y grafeno oxidado. La razón por la cual se eligieron estos nanomateriales es debido a su gran versatilidad, a sus excelentes propiedades tanto eléctricas, mecánicas, su gran aspecto superficial que en si engloban a todos estos materiales, haciéndolos candidatos para la era del postsilicio,...

  18. Auditoría técnica de seguridad de aplicaciones web

    OpenAIRE

    Peña Torres, Isaac

    2016-01-01

    El presente trabajo tiene como objetivo realizar una auditoría técnica de seguridad a una aplicación web. Se revisarán los diez riesgos más importantes presentes en aplicaciones web descritos por OWASP en su informe Top 10 del año 2013. Para revisar estos riesgos se auditarán un conjunto de controles a seleccionados del documento OWASP Testing Guide v4 de OWASP. Como resultado del trabajo se identificarán una serie de problemas de seguridad presentes en la aplicación web objetivo de la audito...

  19. Nuevos aminoácidos cuaternarios derivados de azepanos y sus aplicaciones

    OpenAIRE

    Núñez Villanueva, Diego; Bonache de Marcos, María Ángeles; Martín Martínez, María Mercedes; García-López, M. Teresa; González Muñiz, María Rosario

    2008-01-01

    Nuevos aminoácidos cuaternarios derivados de azepanos y sus aplicaciones. Compuestos (aminoácidos alfa, alfa-heterocíclicos) en los que el heterociclo posee estructura de azepano, oxoazepano o tioazepano, capaces de inducir estructura secundaria en péptidos o de servir como esqueletos de utilidad en la preparación de quimiotecas de compuestos de interés terapéutico. Además, la invención se refiere al procedimiento de obtención de dichos compuestos.

  20. Middle School Cafeteria Food Choice and Waste Prior to Implementation of Healthy, Hunger-Free Kids Act Changes in the National School Lunch Program

    Science.gov (United States)

    Connors, Priscilla; Bednar, Carolyn

    2015-01-01

    Purpose/Objectives: The study objective was to document choices of entrées, vegetables, fruits, grains/breads, and beverages on lunch trays and to determine the amount of each that was discarded after mealtime. Methods: A convenience sample of two urban middle school cafeterias in Texas participated in the study which took place in the 2010-2011…

  1. "Why Are All the Black Kids Still Sitting Together in the Cafeteria?" and Other Conversations about Race in the Twenty-First Century

    Science.gov (United States)

    Tatum, Beverly Daniel

    2017-01-01

    The author, winner of the 2017 Boyer Award, discusses her twentieth-anniversary edition of her book, "Why Are All the Black Kids Sitting Together in the Cafeteria? and Other Conversations about Race." When she told people that she was working on a new edition of her 1997 book, they typically responded with two questions: (1) "Is…

  2. Effects of the cafeteria diet on the salivary glands of trained and sedentary Wistar rats - doi: 10.4025/actascibiolsci.v34i1.7473

    Directory of Open Access Journals (Sweden)

    Maria Raquel Marçal Natali

    2011-11-01

    Full Text Available The objective of this work was to study the effect of the aerobic physical training and the cafeteria diet introduced after weaning of Wistar rats and on the morphology of the main salivary glands (parotid, submandibular, sublingual. Male rats after weaning were subjected to the cafeteria diet or the standard rodent chow, and either performed aerobic physical training in a treadmill for 100 days, or did not performed any physical activity. Analyses were done considering the response in body weight, adipose tissues and salivary glands, and the data were submitted to statistical treatment (p < 0.05. The morphological and morphometric analyses of the salivary glands were performed through histological sections stained with hematoxylin and eosin. Despite the normophagic behavior, the rodents fed with the cafeteria diet became obese, with repercussions on parotid gland weight. However, this obesity and/or physical training did not influence the histological organization of the salivary glands. The morphometric analysis of the submandibular glands pointed out a reduction in the levels of serous acinar cells as an effect of the diet and physical training. In conclusion, the parotid and the submandibular glands alter themselves due to the nature and consistency of food present in the cafeteria diet as well as due to the aerobic physical training.

  3. Extended exposure to a palatable cafeteria diet alters gene expression in brain regions implicated in reward, and withdrawal from this diet alters gene expression in brain regions associated with stress.

    Science.gov (United States)

    Martire, Sarah I; Maniam, Jayanthi; South, Timothy; Holmes, Nathan; Westbrook, R Fred; Morris, Margaret J

    2014-05-15

    Like people, rodents exposed to energy-rich foods over-eat and become overweight. Removal of this diet activates stress systems, which may explain why people have difficulty dieting. We exposed rats to energy-rich foods in order to identify changes in the brain induced by that diet and by its removal. Sprague Dawley rats were fed lab-chow or an energy-rich cafeteria diet (plus chow). Following 6 or 15 weeks, half of each group was switched to the opposing diet. Rats were culled 48-h later. We measured fat mass, plasma hormones, and assessed brains for mRNA expression of several genes. Cafeteria-fed rats consumed more kilojoules, weighed more and had elevated leptin (plus reduced CORT at 15 weeks) relative to chow-fed rats. Fifteen weeks of cafeteria diet suppressed μ-opioid and CB1 receptor mRNA in the VTA, but elevated amygdala GR, and 6 weeks of cafeteria diet reduced BDNF, compared to chow-fed rats. Rats switched to the cafeteria diet ate similar amounts as rats maintained on the diet, and switching to cafeteria diet after 15 weeks reduced amygdala GR expression. Rats switched to chow ate less than rats maintained on chow, and switching to chow following 15 weeks of cafeteria diet increased hypothalamic CRH mRNA. Therefore, 15 weeks of cafeteria diet produced changes in brain regions implicated in reward processes. Switching these rats to chow activated the HPA axis, while switching chow-fed rats to the cafeteria diet decreased GR expression in the amygdala, a region associated with stress. These findings have implications for dieting in humans. Crown Copyright © 2014. Published by Elsevier B.V. All rights reserved.

  4. Chronic intake of a cafeteria diet and subsequent abstinence. Sex-specific effects on gene expression in the mesolimbic reward system.

    Science.gov (United States)

    Ong, Zhi Yi; Wanasuria, Ayumi F; Lin, Mark Z P; Hiscock, Jennifer; Muhlhausler, Beverly S

    2013-06-01

    Studies examining the impact of chronic palatable food intake on the mesolimbic reward system have been conducted almost exclusively in males. This study aimed to determine the effects of chronic intake of a palatable cafeteria diet and subsequent abstinence on fat mass, food intake and key gene expression of the mesolimbic reward system in both males and females. Albino Wistar rats were fed for 8 weeks on standard chow (Control, n=5 males, 5 females) or cafeteria diet (CD; n=16 males, 16 females). The cafeteria diet was then removed from a subset of CD rats for 72 h (CD-Withdrawal group, CD-W). The nucleus accumbens (NAc) was isolated and mRNA expression of tyrosine hydroxylase (TH), dopamine active transporter (DAT), D1 and D2 dopamine receptors, and μ-opioid receptor determined by qRT-PCR. Chronic cafeteria diet intake increased fat mass in all CD rats but body weight and chow intake were reduced during the period of cafeteria diet abstinence. TH mRNA was reduced in male CD and CD-W rats, but increased in female CD and CD-W rats. D1 mRNA was reduced in CD and CD-W females, but increased in CD males, compared to Controls. μ-opioid receptor expression was reduced in CD and CD-W males but not females. These data highlight the importance of investigating sex differences in the neurobiological response to palatable food intake and the need for future studies in this area to include both sexes. Copyright © 2013 Elsevier Ltd. All rights reserved.

  5. Effects of long-term cycling between palatable cafeteria diet and regular chow on intake, eating patterns, and response to saccharin and sucrose.

    Science.gov (United States)

    Martire, Sarah I; Westbrook, R Fred; Morris, Margaret J

    2015-02-01

    When exposed to a diet containing foods that are rich in fat and sugar, rats eat to excess and gain weight. We examined the effects of alternating this diet with laboratory chow on intake of each type of diet, the eating elicited by a palatable food (biscuits), and the drinking elicited by sweet solutions that did (sucrose) or did not (saccharin) contain calories. Each week for 13 weeks, cycled rats were provided with the cafeteria diet for three successive days/nights and the chow diet for the remaining four days/nights, whereas other rats received continuous access to either the cafeteria or the chow diets. On each of the 13 weeks, cycled rats ate more across the first 24 hour exposure to the cafeteria diet than rats continuously fed this diet. In contrast, cycled rats ate less across the first 24 hour exposure to the chow diet than rats continuously fed this diet and ate less when presented a novel palatable biscuit than chow-fed rats. The three groups exhibited similar licks per cluster to saccharin, but cafeteria-fed and cycled rats showed fewer clusters than chow-fed rats. In contrast, chow-fed rats and cycled rats exhibited more licks per cluster to sucrose than cafeteria-fed rats, but all three groups had a similar number of clusters. The results were discussed in relation to the effects of diet cycling on eating patterns, body weight, and 'wanting' and 'liking'. These findings with rats may have important implications for yo-yo dieting in people. Copyright © 2014 Elsevier Inc. All rights reserved.

  6. Análisis de la calidad y seguridad de la información de aplicaciones móviles en prevención terciaria

    Directory of Open Access Journals (Sweden)

    Martínez-Moreno J

    2015-12-01

    Full Text Available Objetivo: Analizar la calidad y seguridad de la información de las aplicaciones móviles en la App Store de Apple® destinadas a prevención terciaria. Material y métodos: Estudio observacional transversal de las aplicaciones móviles más populares en la categoría de medicina disponibles en Apple Store® a día de 21 de diciembre de 2014. Las aplicaciones fueron evaluadas con los criterios establecidos en el programa AppSaludable. Se seleccionaron aquellos criterios relacionados con la evaluación de la calidad y seguridad de la información. Resultados: De las 160 aplicaciones recogidas, sólo 12 aplicaciones estaban incluidas en la prevención terciaria. Todas las aplicaciones recuperadas estaban relacionadas con la adherencia, diabetes, hipertensión y alergia. Las aplicaciones desarrolladas por equipos multidisciplinares fueron las que presentaron mayor rigor en su información, Conclusiones: La presencia de un profesional sanitario como colaborador de la aplicación parece mejorar la calidad de la información.

  7. Propiedades y aplicaciones de los materiales aislantes a base de vidrio espumado

    Directory of Open Access Journals (Sweden)

    Sánchez Castro, Carlos

    1958-02-01

    Full Text Available Not availableEn un artículo precedente, aparecido en el núm. 82 de U. A. M. C., se definieron y estudiaron brevemente los materiales aislantes a base de vidrio espumado -Foamglas-, dedicándose una atención más amplia a los procedimientos y ensayos de laboratorio, realizados para obtener la máxima espumación del producto. Entonces sólo se mencionaron algunas de sus características y propiedades más importantes; también se indicaron, sin entrar en detalles, algunas de sus aplicaciones. Seguidamente, y como complemento de lo anteriormente dicho, se van a enumerar: las características de este material, pesos específicos, coeficientes de aislamiento, resistencias, etc.; los productos que con él se fabrican, bloques, planchas, coquillas, etc.; y las distintas aplicaciones que tiene en la construcción y en otras industrias, a las cuales beneficia con su colaboración, resolviendo problemas de aislamiento, aligeramiento de peso, etc. En distintas fotografías se presentan algunos ejemplos de aislamiento, de edificios, fijación de piezas y enlucido o revestimiento de los paramentos realizados con este producto.

  8. Desarrollo de aplicaciones móviles bajo la plataforma de Iphone

    Directory of Open Access Journals (Sweden)

    Karen Melissa Rojas Lizarazo

    2012-05-01

    Full Text Available El iPhone es un dispositivo móvil que lleva cerca de cinco años en el mercado de celulares, y sus funciones van más allá del uso como tal de un teléfono celular, gracias al App Store, que ofrece miles de aplicaciones creadas por desarrolladores alrededor del mundo. La arquitectura y el sistema operativo del iPhone permiten que las aplicaciones creadas por desarrolladores usen tecnologías especializadas para diferentes tipos de usuarios, permitiendo incluir características como gráficos de alta definición o usar accesorios de hardware, haciendo uso de los frameworks soportados por la arquitectura del dispositivo; todo esto es posible crearlo gracias a las herramientas de desarrollo provistas por Apple. El almacenamiento y la persistencia de datos se ven plasmados en el desarrollo de una aplicación caso de estudio que hace uso de Core Data para el manejo de la información.

  9. Desarrollo de aplicaciones móviles bajo la plataforma de Iphone

    Directory of Open Access Journals (Sweden)

    Jaime Esteban Roa Castañeda

    2011-07-01

    Full Text Available El iPhone es un dispositivo móvil que lleva cerca de cinco años en el mercado de celulares, y sus funciones van más allá del uso como tal de un teléfono celular, gracias al App Store, que ofrece miles de aplicaciones creadas por desarrolladores alrededor del mundo. La arquitectura y el sistema operativo del iPhone permiten que las aplicaciones creadas por desarrolladores usen tecnologías especializadas para diferentes tipos de usuarios, permitiendo incluir características como gráficos de alta definición o usar accesorios de hardware, haciendo uso de los frameworks soportados por la arquitectura del dispositivo; todo esto es posible crearlo gracias a las herramientas de desarrollo provistas por Apple. El almacenamiento y la persistencia de datos se ven plasmados en el desarrollo de una aplicación caso de estudio que hace uso de Core Data para el manejo de la información.

  10. Potenciales aplicaciones de Moringa oleifera. Una revisión crítica

    Directory of Open Access Journals (Sweden)

    C Martín

    Full Text Available Moringa oleifera es un árbol originario de la India al que se le atribuyen múltiples beneficios para el bienestar humano. Es de crecimiento rápido, de relativamente poca exigencia hacia el suelo y se cultiva en toda la franja intertropical. Uno de los principales usos de sus hojas y de la torta de prensado de su semilla es en la formulación de raciones para la alimentación animal. Sin embargo, prácticamente todas las partes del árbol tienen diversas aplicaciones, sobre lo cual existen testimonios que se remontan a la Antigüedad. En este trabajo se hace una revisión de la literatura disponible sobre la utilización de esta planta. Se presentan distintos campos de aplicación de M. oleifera a la luz del creciente interés científico que ha generado en los últimos lustros. El objetivo es presentar las evidencias aportadas por la literatura científica que confirman y explican las propiedades y aplicaciones de la moringa, las cuales se distancian de versiones sin confirmar aportadas por la literatura popular y la publicidad.

  11. Application techniques of coatings by thermal projection; Tecnicas de aplicacion de recubrimientos por proyeccion termica

    Energy Technology Data Exchange (ETDEWEB)

    Porcayo Calderon, Jesus [Instituto de Investigaciones Electricas, Cuernavaca (Mexico)

    1995-12-31

    The coatings applied by thermal projection have an important number of applications in different industries (chemical, oil, electric, nuclear, etc.). The main purpose of the protection by means of coatings is to alter the surface characteristics of a component so as to resist corrosive environments, abrasion and erosion, among others. The coatings can be applied by different methods, but due to the fact that its characteristics appreciably differ from the base metal, it is important the knowledge of its properties when a coating is selected for a specific use. In this article the characteristics of the applied coatings by thermal projection, the factors that affect its performance and the principal application techniques, are described. [Espanol] Los recubrimientos aplicados por proyeccion termica tienen un numero importante de aplicaciones en diferentes industrias (quimica, petrolera, electrica, nuclear, etc.). El proposito principal de la proteccion por medio de recubrimientos es alterar las caracteristicas de la superficie de un componente de manera que resista ambientes corrosivos, abrasion y erosion, entre otros. Los recubrimientos pueden aplicarse por diferentes metodos, pero debido a que sus propiedades difieren apreciablemente de las del metal base, es importante el conocimiento de sus propiedades cuando se selecciona un recubrimiento para un uso especifico. En este articulo se describen las caracteristicas de los recubrimientos aplicados por proyeccion termica, los factores que afectan su desempeno y las principales tecnicas de aplicacion.

  12. APLICACIONES DE LAS RADIACIONES ELECTROMAGNÉTICAS NO IONIZANTES (RNI EN PROYECTOS INTERDISCIPLINARES DE INVESTIGACIÓN UPSE

    Directory of Open Access Journals (Sweden)

    Nestor Minhuey

    2016-04-01

    Se analizan los proyectos de investigación que se están desarrollando en la Escuela de Electrónica y Telecomunicaciones en Aplicaciones de las Radiaciones electromagnéticas no ionizantes en la interface tecnología, biología y biofísica.

  13. Investigación en Progreso: Ingeniería de Software en el Desarrollo de Aplicaciones Sensibles al Contexto

    Directory of Open Access Journals (Sweden)

    Marisa D. Panizzi

    2015-10-01

    Full Text Available Las aplicaciones han ido evolucionando independientemente de cuál sea su dominio de aplicación, actualmente nos encontramos con aplicaciones que pueden brindar servicios de acuerdo a la ubicación, tiempo y perfil del usuario. Este tipo de aplicaciones que brindan estos servicios se las conoce como Aplicaciones Sensibles al Contexto (CA – Context Aware, en este tipo de aplicaciones predominan los dispositivos móviles y el perfil del usuario. La evolución varía en función de la forma de uso de la computadora, es decir que se brinden servicios a pedido del usuario o que se brinden servicios de manera automática. Para acompañar la evolución de este tipo de aplicaciones, la Ingeniería de Software ha focalizado sus esfuerzos en aspectos relacionados a separar la aplicación de todo lo concerniente a la captación, interpretación, control y supervisión de la información contextual. Es decir que desde el punto de vista del diseño, se separe la conducta sensible al contexto de la conducta propia de la aplicación con el propósito de que ambos tipos de aplicaciones pueden evolucionar en forma independiente además de reducir el tiempo de desarrollo en este tipo de sistemas. Este proyecto presenta una sub línea, la cual orientará sus aportes, en la consolidación de un framework de gestión contextual de dos o tres variables de contexto como por ejemplo: la ubicación, considerando la construcción de la documentación relevante que lo respalde como así también su fase de experimentación con una aplicación que permitirá a los usuarios de la comunidad universitaria UM hacer uso de los servicios ofrecidos por la misma. La segunda sub línea, se vincula al Área de la Ingeniería de Requisitos, pretendiendo obtener un modelo para la especificación de requisitos de software para sistemas sensibles al contexto.

  14. Tamaño efectivo poblacional - modelos y aplicaciones

    Directory of Open Access Journals (Sweden)

    Acreche, Noemí

    2003-01-01

    Full Text Available El Tamaño Efectivo de la Población, Ne, es un parámetro central en estudios cuyo objetivo es la comprensión del proceso evolutivo ya que cuantifica la tasa a la cual la variabilidad genética es erosionada por la deriva génica. Por lo menos en poblaciones no estructuradas, la deriva génica es cuantificada por un único parámetro: el Tamaño Efectivo de la Población. Esto lleva en situaciones reales, para medir los efectos de la deriva, a estimar este indicador. Estimar la población efectiva sin hacer uso de datos genético-poblacionales tales como cambio en el nivel de heterocigosis o de frecuencias génicas representa un importante aporte considerando que esta información no siempre está disponible. Contrariamente, se puede contar con datos tales como número censal, distribución de edad y sexo, media, varianza y covarianza del número de descendientes por padre y con ellos estimar niveles de endogamia y/o de variaciones en heterocigosis y frecuencias génicas. En la mayoría de los modelos, Ne corresponde a una población ideal de tamaño invariable, con igual número de ambos sexos, sin endocruzamiento, en la que cada individuo tiene la misma probabilidad de dejar progenie en la misma cantidad, de modo que el número de hijos por persona distribuye según Poisson. Se estudiaron 14 poblaciones del NOA que no exceden el límite inferior propuesto para valores absolutos de Ne. La mayoría poseen N efectivos menores que 50, por lo que se puede prever depresión endogámica a corto plazo. Los valores calculados son los suficientemente bajos como para indicar que se trata de poblaciones en las que los efectos de Deriva Génica y endogamia pueden tener considerable incidencia.

  15. Effects of Acerola (Malpighia emarginata DC.) Juice Intake on Brain Energy Metabolism of Mice Fed a Cafeteria Diet.

    Science.gov (United States)

    Leffa, Daniela Dimer; Rezin, Gislaine Tezza; Daumann, Francine; Longaretti, Luiza M; Dajori, Ana Luiza F; Gomes, Lara Mezari; Silva, Milena Carvalho; Streck, Emílio L; de Andrade, Vanessa Moraes

    2017-03-01

    Obesity is a multifactorial disease that comes from an imbalance between food intake and energy expenditure. Moreover, studies have shown a relationship between mitochondrial dysfunction and obesity. In the present study, we investigated the effect of acerola juices (unripe, ripe, and industrial) and its main pharmacologically active components (vitamin C and rutin) on the activity of enzymes of energy metabolism in the brain of mice fed a palatable cafeteria diet. Two groups of male Swiss mice were fed on a standard diet (STA) or a cafeteria diet (CAF) for 13 weeks. Afterwards, the CAF-fed animals were divided into six subgroups, each of which received a different supplement for one further month (water, unripe, ripe or industrial acerola juices, vitamin C, or rutin) by gavage. Our results demonstrated that CAF diet inhibited the activity of citrate synthase in the prefrontal cortex, hippocampus, and hypothalamus. Moreover, CAF diet decreased the complex I activity in the hypothalamus, complex II in the prefrontal cortex, complex II-III in the hypothalamus, and complex IV in the posterior cortex and striatum. The activity of succinate dehydrogenase and creatine kinase was not altered by the CAF diet. However, unripe acerola juice reversed the inhibition of the citrate synthase activity in the prefrontal cortex and hypothalamus. Ripe acerola juice reversed the inhibition of citrate synthase in the hypothalamus. The industrial acerola juice reversed the inhibition of complex I activity in the hypothalamus. The other changes were not reversed by any of the tested substances. In conclusion, we suggest that alterations in energy metabolism caused by obesity can be partially reversed by ripe, unripe, and industrial acerola juice.

  16. Behavioral characterization of a model of differential susceptibility to obesity induced by standard and personalized cafeteria diet feeding.

    Science.gov (United States)

    Gac, L; Kanaly, V; Ramirez, V; Teske, J A; Pinto, M P; Perez-Leighton, C E

    2015-12-01

    Despite the increase in obesity prevalence over the last decades, humans show large inter-individual variability for susceptibility to diet-induced obesity. Understanding the biological basis of this susceptibility could identify new therapeutic alternatives against obesity. We characterized behavioral changes associated with propensity to obesity induced by cafeteria (CAF) diet consumption in mice. We show that Balb/c mice fed a CAF diet display a large inter-individual variability in susceptibility to diet-induced obesity, such that based on changes in adiposity we can classify mice as obesity prone (OP) or obesity resistant (OR). Both OP and OR were hyperphagic relative to control-fed mice but caloric intake was similar between OP and OR mice. In contrast, OR had a larger increase in locomotor activity following CAF diet compared to OP mice. Obesity resistant and prone mice showed similar intake of sweet snacks, but OR ate more savory snacks than OP mice. Two bottle sucrose preference tests showed that OP decreased their sucrose preference compared to OR mice after CAF diet feeding. Finally, to test the robustness of the OR phenotype in response to further increases in caloric intake, we fed OR mice with a personalized CAF (CAF-P) diet based on individual snack preferences. When fed a CAF-P diet, OR increased their calorie intake compared to OP mice fed the standard CAF diet, but did not reach adiposity levels observed in OP mice. Together, our data show the contribution of hedonic intake, individual snack preference and physical activity to individual susceptibility to obesity in Balb/c mice fed a standard and personalized cafeteria-style diet. Copyright © 2015 Elsevier Inc. All rights reserved.

  17. Laser photobiomodulation as an adjunct of the wound healing impairment of rats exposed to a cafeteria diet

    Science.gov (United States)

    Uzeda, V.; Paraguassu, G. M.; Dos Santos, J. N.; Ramalho, M. J.; Rodriguez, T. T.; Ramalho, L. M. P.

    2014-02-01

    Obesity is associated to a delayed wound healing and prolonged inflammatory phase. Laser light has shown positive results in the photobiomodulation of tissue repair; however, its use associated with systemic disorders such as obesity is still little explored in the literature. The aim of this study was to validate an experimental system for studying weight gaining by consuming a high fat diet called "cafeteria diet" (CD) for the induction of obesity. Forty-eight rats were weaned, divided into two experimental groups: standard diet (SD) and Cafeteria Diet (CD). Free feeding was carried out during 20 weeks and the mass gaining was accompanied. After general anesthesia standardized surgical wounds were created (1cm2) in the dorsal midline region of each animal. Both groups (SD; CD) were divided into 2 subgroups of 12 animals, G1 and G3 (non-irradiated) and G2 and G4 (irradiated). The irradiation protocols (λ660 nm, 40 mW, CW; 24 J/cm2) started immediately after surgery and were repeated every other day during 14 days. The rats were killed at the 8th or 15th days after surgery. The abdominal fat was removed and weighed to verify the success of the induction technique. The specimens were taken and routinely processed histology (hematoxylin/eosin) was performed. It was concluded that the ingestion of fast-food increased abdominal fat in rats and modified the inflammatory pattern of the healing. Laser phototherapy in the parameters employed decreased inflammatory intensity quickening wound healing in obese rats.

  18. Foods offered in Quebec school cafeterias: do they promote healthy eating habits? Results of a provincial survey.

    Science.gov (United States)

    Morin, Pascale; Demers, Karine; Gray-Donald, Katherine; Mongeau, Lyne

    2012-06-05

    A school environment that encourages students to opt for food with sound nutritional value is both essential and formative in ensuring that young people adopt healthy eating habits. The aim of this paper is to describe the food offered for lunch in the cafeteria service lines in Quebec schools on regular school days. A cross-sectional survey was conducted between November 2008 and June 2009 with a representative sample of 207 French-speaking schools in the province of Quebec. The response rate was 71%. The cafeteria food available from the service line was observed directly and systematically by research assistants trained in observational procedures. Bivariate and descriptive analyses were performed. While most schools offered a vegetable side dish, only 71% of primary schools, 71% of public secondary schools, and 54% of private secondary schools did not offer cold-cut dishes, stuffed pastry, or a fried food on their daily menus. The sandwiches available were rarely made with whole-grain bread. Public secondary schools had more cookies, biscuits, muffins, and chewing gum than private primary and secondary schools. Milk was available in 85% of the primary schools. Most of the schools had eliminated sodas but were still offering fruit cocktails instead of 100% fruit juice. The school eating environment changed significantly from 2002 to 2009, presumably as a result of the government action plan and the Framework Policy. Improvements must be made with respect to reducing added sugar in beverages and desserts and promoting baked rather than fried snacks. Vigilance is required since many new products are making their way into the market.

  19. Rats eat a cafeteria-style diet to excess but eat smaller amounts and less frequently when tested with chow.

    Directory of Open Access Journals (Sweden)

    Timothy South

    Full Text Available BACKGROUND: Obesity is associated with excessive consumption of palatable, energy dense foods. The present study used an animal model to examine feeding patterns during exposure to and withdrawal from these foods. METHODS: Male Sprague Dawley rats were exposed to standard lab chow only (Chow rats or a range of cafeteria-style foods eaten by people (Caf rats. After 1, 4, 7 and 10 weeks of diet in their home cage, rats were subjected to 24-hour test sessions in a Comprehensive Lab Animal Monitoring System (CLAMS. In the first two test sessions, Chow rats were exposed to standard lab chow only while Caf rats were exposed to a biscuit and high-fat chow diet. In the final two test sessions, half the rats in each group were switched to the opposing diet. In each session we recorded numbers of bouts, energy consumed per bout, and intervals between bouts across the entire 24 hours. RESULTS: Relative to Chow rats, Caf rats initiated fewer bouts but consumed more energy per bout; however, their motivation to feed in the CLAMS declined over time, which was attributed to reduced variety of foods relative to their home cage diet. This decline in motivation was especially pronounced among Caf rats switched from the palatable CLAMS diet to standard lab chow only: the reduced energy intake in this group was due to a modest decline in bout frequency and a dramatic decline in bout size. CONCLUSIONS: Exposure to a cafeteria-diet, rich in variety, altered feeding patterns, reduced rats' motivation to consume palatable foods in the absence of variety, and further diminished motivation to feed when palatable foods were withdrawn and replaced with chow. Hence, variety is a key factor in driving excessive consumption of energy dense foods, and therefore, excessive weight gain.

  20. Características generales, propiedades, yacimientos y aplicaciones de pirofilita. II. Yacimientos, aplicaciones y utilización como materia prima cerámica

    Directory of Open Access Journals (Sweden)

    Sánchez Soto, P. J.

    1998-10-01

    Full Text Available In this work, the main world deposits of pyrophyllite are indicated according to the literature, showing the available production data. It is emphasized the research focusing on mining and characterization of raw materials containing pyrophyllite, which shows a marked applied interest. It is described and reviewed the most relevant applications of pyrophyllite and pyrophyllite raw materials, in especial refractories and ceramics, fillers, building materials, catalysts and as a high-pressure medium for synthesis of materials. Finally, it is also described and reviewed its use as raw material for the preparation of advanced materials, such as sialon, emphasizing the possibilities of application of pyrophyllite raw materials in our country as a result of distinct investigations of relevant interest performed by several Research Institutes and University Departments. It is deduced that pyrophyllite and pyrophyllite raw materials are increasing in relative importance in many applied fields, as compared with other layer silicates, such as talc and kaolinite.

    En este trabajo se indican los principales yacimientos mundiales de pirofilita según la bibliografía, los datos de producción disponibles, además de revisar las investigaciones más destacadas sobre prospección y caracterización de materias primas que contienen pirofilita y que presentan un marcado interés aplicado. Se realiza una amplia revisión de las principales aplicaciones a las que se destinan dichas materias primas, en especial para la preparación de materiales cerámicos y refractarios, su uso como carga, en la construcción, obtención de catalizadores y síntesis de materiales a alta presión debido a sus propiedades. Por último, se describen y revisan sus aplicaciones en la preparación de nuevos materiales y materiales avanzados, como son los sialones, destacando su potencial de utilización en nuestro país como resultado de diversas investigaciones de inter

  1. Banco de ensayos para materiales piezoeléctricos en aplicaciones viales

    Directory of Open Access Journals (Sweden)

    de Frutos, J.

    2011-04-01

    Full Text Available The test bench system described in this paper performs experiments on piezoelectric materials used in road traffic applications, covering a range between 14 and 170 km/h, which is considered enough for testing under standard traffic conditions. A software has been developed to control the three phase induction motor driver and to acquire all the measurement data of the piezoelectric materials. The mass over each system’s axis can be selected, with a limit of 60 kg over each wheel. The test bench is used to simulate the real behaviour of buried piezoelectric cables in road traffic applications for both light and heavy vehicles. This new test bed system is a powerful research tool and can be applied to determine the optimal installation and configuration of the piezoelectric cable sensors and opens a new field of research: the study of energy harvesting techniques based on piezoelectric materials.

    En este trabajo se define y propone un banco de ensayos que permite testar materiales piezoeléctricos para aplicaciones viales en sus diferentes configuraciones en un rango de velocidad entre los 14 y los 170 km/h, lo que cubre sobradamente las condiciones de tráfico real. Tanto el control del variador de velocidad del motor trifásico que realiza el accionamiento del banco, como la recogida de resultados de medida en las pruebas de excitación y de fatiga de los compuestos piezoeléctricos, se realiza de forma automatizada mediante código informatico. El peso que soporta cada eje del banco es configurable, permitiendo reproducir las señales obtenidas en aplicaciones donde los materiales piezoeléctricos actúan de sensores enterrados en la calzada para vehículos tanto pesados como ligeros. Gracias a esta nueva herramienta se facilita la investigación con materiales de este tipo en aplicaciones viales optimizando tanto el tipo como la disposición e instalación de los mismos, además de abrir el camino a la novedosa investigación sobre

  2. APRENDIZAJE BASADO EN EJEMPLOS: DESARROLLO DE APLICACIONES EMPRESARIALES CON TECNOLOGÍAS .NET

    Directory of Open Access Journals (Sweden)

    Marcos Gestal

    2015-06-01

    Full Text Available RESUMEN: El framework J2EE ha sido el gran dominador, durante mucho tiempo, en el desarrollo de aplicaciones empresariales. Esto hecho originó la aparición de un rico ecosistema de herramientas, manuales, tutoriales, etc., que explican las diferentes alternativas o peculiaridades a la hora de su implementación. La irrupción de .NET Framework, en el ámbito empresarial, ha producido una fuerte demanda de implementación de aplicaciones bajo dicha arquitectura. Sin embargo, la cantidad o calidad de la documentación disponible dista considerablemente con respecto a la existente, su principal alternativa (J2EE. Esta laguna de documentación, es especialmente visible y preocupante cuando se establece como objetivo dar a conocer los conceptos del framework, desde un punto de vista docente, a los futuros egresados del Grado en Ingeniería en Informática. Este trabajo describe el enfoque docente seguido, para alcanzar el citado objetivo de familiarizar a los alumnos con este framework alternativo y las prácticas habituales de modelo dentro de éste. Para ello, se basa principalmente de un conjunto de sencillos tutoriales con los que mostrar los fundamentos de la tecnología y dos aplicaciones completas (miniportal y minibank en las que se muestra cómo aplicar patrones de diseño, a la hora de abordar una aplicación empresarial. ABSTRACT: For a long time, J2EE has been the dominating framework for the development of business applications. This fact resulted in a rich ecosystem of tools, manuals, tutorials, etc. that explain different implementation alternatives or peculiarities. The incursion of .NET Framework in the business environment has generated a strong demand of application implementation under this architecture. However, the quantity and quality of documents available significantly differs from its main alternative (J2EE. This documentation gap is especially visible and worrying when the objective is to teach the concepts of Framework

  3. CRITERIOS PARA LA EVALUACIÓN DE SUPERFICIES MULTITÁCTILES Y SUS APLICACIONES

    Directory of Open Access Journals (Sweden)

    YENNY A. MÉNDEZ

    2012-06-01

    Full Text Available Las superficies multitáctiles son tecnologías que empiezan a tener un elevado uso. Se toman como referentes aspectos utilizados para la evaluación de usabilidad de sistemas interactivos, así como las característicasque los investigadores y desarrolladores sugieren que deberían tener las superficies multitáctiles y las aplicaciones desarrolladas. Se presenta una propuesta inicial de criterios que deberían tenerse en cuenta para incluir  aspectos de ergonomía, usabilidad y colaboración en el momento de realizar evaluaciones para estas tecnologías. Se ilustra cómo se pueden aplicar los criterios propuestos a través de un caso de estudio que cuenta con resultados promisorios.

  4. Celulosa bacteriana en gluconacetobacter xylinum: biosíntesis y aplicaciones

    Directory of Open Access Journals (Sweden)

    Juan Luis Chávez- Pacheco

    2004-01-01

    Full Text Available La celulosa es la molécula orgánica más abundante en la naturaleza y posee gran importancia a nivel industrial; es sintetizada por una variedad de organismos, incluyendo plantas, algas, hongos, bacterias y animales. Gluconacetobacter xylinum es la bacteria con mayor capacidad productora de celulosa y es el organismo modelo en la investigación sobre los procesos que regulan la biosíntesis del polímero. El presente documento ofrece una revisión de los progresos en la comprensión del proceso de síntesis de celulosa, las características particulares de la celulosa bacteriana como fuente alterna a la celulosa vegetal y sus aplicaciones biotecnológicas

  5. Programación de aplicaciones web: historia, principios básicos y clientes web

    OpenAIRE

    Luján Mora, Sergio

    2002-01-01

    Aunque los inicios de Internet se remontan a los años sesenta, no ha sido hasta los años noventa cuando, gracias a la Web, se ha extendido su uso por todo el mundo. En pocos años la Web ha evolucionado enormemente: se ha pasado de páginas sencillas, con pocas imágenes y contenidos estáticos a páginas complejas con contenidos dinámicos que provienen de bases de datos, lo que permite la creación de "aplicaciones web". De forma breve, una aplicación web se puede definir como una aplicación en la...

  6. El experimento mago de Oz y sus aplicaciones: una mirada retrospectiva

    Directory of Open Access Journals (Sweden)

    CARLOS M. ZAPATA

    2007-01-01

    Full Text Available En la Lingüística Computacional los corpus han sido uno de los recursos más utilizados para estudiar los diferentes fenómenos lingüísticos. La recopilación de corpus en los cuales se presenta interacción entre el humano y el computador presenta como problema fundamental los errores que se pueden inducir por parte del humano, cuyo lenguaje se simplifica en presencia del computador. Para realizar la recopilación de estos corpus se han empleado los Experimentos Mago de Oz (MDO. En este artículo se muestra una mirada retrospectiva del Experimento Mago de Oz, clasificando sus principales aplicaciones.

  7. Modelo de Sistema Basado en Conocimiento en el Dominio de la Seguridad de Aplicaciones

    Directory of Open Access Journals (Sweden)

    María Victoria Bajarlía

    2013-12-01

    Full Text Available El objetivo es proponer un modelo de un sistema basado en conocimiento (SBC aplicado al análisis de seguridad de aplicaciones de gestión. El modelo se fundamenta en un sistema basado en conocimiento (SBC que cuenta con un componente cognitivo que le permite incorporar conocimiento. En virtud de que las amenazas y los ataques informáticos representan un problema constante y creciente se puede suponer que el SBC, a través del aprendizaje dinámico que lo mantendrá actualizado, podrá asistir a los especialistas en Seguridad de la Información, en el área de competencia, a la elaboración de Especificación de Requerimientos.

  8. Interactive applications for energy saving; Aplicaciones interactivas para ahorro de energia

    Energy Technology Data Exchange (ETDEWEB)

    Adame Gonzalez, Alejandro; Ramirez Anaya, Cesar; Gutierrez, Hector; Dominguez Ojeda, Xerxes; Aguilar Galvan, Alfredo [Ingenieria Energetica Integral S. A. de C. V., Mexico, D. F. (Mexico)

    1998-12-31

    A series of ideas are presented that can help in the development of interactive applications for energy saving. Emphasis is made on the Fideicomiso de Apoyo al Programa de Ahorro de Energia (FIDE)`s Interactive Course on Demand Management and Power Factor Compensation, in order to demonstrate how far one can go with the multimedia development. [Espanol] Se presenta un conjunto de ideas que pueden auxiliar en la elaboracion de aplicaciones interactivas para ahorro de energia. Se hace principal enfasis sobre el curso interactivo Administracion de la Demanda y Compensacion del Factor de Potencia del Fideicomiso de Apoyo al Programa de Ahorro de Energia (FIDE) con la finalidad de mostrar hasta donde puede llegarse con un desarrollo multimedia.

  9. Algunas aplicaciones de la estructura booleana del código genético

    OpenAIRE

    Gladys Casas Cardoso; Robersy Sánchez Rodríguez; Deborah Galpert Cañizares; Maria del Carmen Chávez; Ricardo Grau Ábalo; Eberto Morgado Morales

    2011-01-01

    Las estructuras boolenas del código genético constituyen modelos matemáticos minimales y muy simplificados que nos ayudan a comprender mejor la lógica subyacente del código genético. Más específicamente, estas estructuras reflejan una fuerte conexión entre los órdenes del código genético y las propiedades físico-químicas de los aminoácidos. En este artículo presentamos dos aplicaciones de esta estructura algebraica en problemas típicos de Bioinformática. El primer es el de la clasificación de...

  10. Análisis del comportamiento contextual del usuario y su relación con el consumo de aplicaciones móviles

    Directory of Open Access Journals (Sweden)

    Luis Antonio Rojas-Potosí

    2014-06-01

    Full Text Available El mercado de aplicaciones móviles crece aceleradamente, captando la atención sobre el análisis del consumo de las mismas para mejorar su recomendación y la satisfacción del usuario, soportado en la búsqueda de información que permita explicar la ocurrencia de eventos del ciclo de vida de las aplicaciones. En este sentido algunos estudios muestran una fuerte relación entre dichos eventos e información sobre la situación contextual actual del usuario y su registro de consumo de aplicaciones. Sin embargo, dichos trabajos no consideran la relación existente entre el registro de estados de las dimensiones contextuales (denominado como CUBe y la ocurrencia de eventos del ciclo de vida de las aplicaciones, tal como lo hace este estudio. En este sentido, se presenta un análisis estadístico sobre un dataset real, evidenciando una fuerte relación entre el CUBe y el lanzamiento de un conjunto de aplicaciones. Finalmente, se describe un escenario donde estas relaciones pueden ser utilizadas para enriquecer sistemas de recomendación para aplicaciones móviles.

  11. Cafeteria diet-induced insulin resistance is not associated with decreased insulin signaling or AMPK activity and is alleviated by physical training in rats

    DEFF Research Database (Denmark)

    Brandt, Nina; De Bock, Katrien; Richter, Erik

    2010-01-01

    Excess energy intake via a palatable low-fat diet (cafeteria diet) is known to induce obesity and glucose intolerance in rats. However, the molecular mechanisms behind this adaptation are not known, and it is also not known whether exercise training can reverse it. Male Wistar rats were assigned...... was counteracted by training. In the perfused hindlimb, insulin-stimulated glucose transport in red gastrocnemius muscle was completely abolished in CAF and rescued by exercise training. Apart from a tendency toward an approximately 20% reduction in both basal and insulin-stimulated Akt Ser(473) phosphorylation (P......) among the groups. In conclusion, surplus energy intake of a palatable but low-fat cafeteria diet resulted in obesity and insulin resistance that was rescued by exercise training. Interestingly, insulin resistance was not accompanied by major defects in the insulin-signaling cascade or in altered AMPK...

  12. Application of frequency converters in industry; Aplicacion de convertidores de frecuencia en la industria

    Energy Technology Data Exchange (ETDEWEB)

    Delmar Saavedra, Alejandro [Eficiencia Energetica, S.A. de C.V., Mexico, D. F. (Mexico)

    1999-07-01

    Next an analysis methodology for the application of a frequency converter in equipment that handles flows, as they can be pumps, fans, blowers and extractors is presented. Measurements of some practical cases that we have had in the industry are shown. Some of the types of applications in which the control of speed with the frequency converter is used, are the following ones: pumps, fans, mills, crushing machines, extruders, Banbury mixers, spinning machines, conveyors, mixers, electrical vehicles, lime furnaces, injection machines, blowers and extractors. The purpose of a frequency converter is of controlling the speed and/or torque of an electrical motor. The reasons for which a frequency converter is used can be classified, in two large fields: the necessary and those that provide energy saving. [Spanish] A continuacion se presenta una metodologia de analisis para la aplicacion de un convertidor de frecuencia en equipos que manejan flujos, como pueden ser bombas, ventiladores, sopladores y extractores. Se muestran mediciones de algunos casos practicos que hemos tenido en la industria. Algunos de los tipos de aplicaciones en donde se usa el control de velocidad con el convertidor de frecuencia, son los siguientes: bombas, ventiladores, molinos, trituradoras, extrusoras, mezcladoras banbury, maquinas de hilado, transportadoras, mezcladoras, vehiculos electricos, horno de cal, maquinas de inyeccion, sopladores y extractores. El proposito de un convertidor de frecuencia es el de controlar la velocidad y/o par en un motor electrico. Se pueden, clasificar las razones por las que se usa un convertidor de frecuencia, en dos grandes campos: las necesarias y las que proporcionan ahorros de energia.

  13. Acerola (Malpighia emarginata DC.) juice intake protects against alterations to proteins involved in inflammatory and lipolysis pathways in the adipose tissue of obese mice fed a cafeteria diet

    OpenAIRE

    Dias, Fernando Milanez; Leffa, Daniela Dimer; Daumann, Francine; de Oliveira Marques, Schérolin; Luciano, Thais F; Possato, Jonathan Correa; de Santana, Aline Alves; Neves, Rodrigo Xavier; Rosa, José Cesar; Oyama, Lila Missae; Rodrigues, Bruno; de Andrade, Vanessa Moraes; de Souza, Cláudio Teodoro; de Lira, Fabio Santos

    2014-01-01

    Background: Obesity has been studied as a metabolic and an inflammatory disease and is characterized by increases in the production of pro-inflammatory adipokines in the adipose tissue. To elucidate the effects of natural dietary components on the inflammatory and metabolic consequences of obesity, we examined the effects of unripe, ripe and industrial acerola juice (Malpighia emarginata DC.) on the relevant inflammatory and lipolysis proteins in the adipose tissue of mice with cafeteria diet...

  14. Effect of Cafeteria Diet History on Cue-, Pellet-Priming-, and Stress-Induced Reinstatement of Food Seeking in Female Rats

    OpenAIRE

    Chen, Yu-Wei; Fiscella, Kimberly A.; Bacharach, Samuel Z.; Calu, Donna J.

    2014-01-01

    Background Relapse to unhealthy eating habits is a major problem in human dietary treatment. The individuals most commonly seeking dietary treatment are overweight or obese women, yet the commonly used rat reinstatement model to study relapse to palatable food seeking during dieting primarily uses normal-weight male rats. To increase the clinical relevance of the relapse to palatable food seeking model, here we pre-expose female rats to a calorically-dense cafeteria diet in the home-cage to m...

  15. Nourishing change. Partnership enlists dozens of hospitals to put healthier food on their menus and kick junk food out of the cafeteria.

    Science.gov (United States)

    Lee, Jaimy

    2012-10-08

    More than 150 hospitals have signed on to the Partnership for a Healthier America's push to ditch the deep-fat fryer in their cafeterias and bulk up on fruit and veggies. "Our focus is to ensure that if people want to make a healthy choice, they can," says Larry Soler, left, president and CEO of the partnership, which is working to reduce childhood obesity.

  16. Consumer Nutrition Environments of Hospitals: An Exploratory Analysis Using the Hospital Nutrition Environment Scan for Cafeterias, Vending Machines, and Gift Shops, 2012

    Science.gov (United States)

    Sallis, James F.; Swartz, Michael D.; Hoelscher, Deanna M.; Peskin, Melissa F.

    2013-01-01

    Introduction Hospitals are the primary worksite of over 5 million adults in the United States, and millions of meals are procured and consumed in this setting. Because many worksite nutrition initiatives use an ecological framework to improve the dietary habits of employees, the nutrition values of foods served in hospitals is receiving attention. Methods This study used the Hospital Nutrition Environment Scan for Cafeterias, Vending Machines, and Gift Shops to quantitatively describe the consumer nutrition environments of 39 hospitals in Southern California. Data were collected by visiting each facility once from February 2012 through May 2012. Results On average, hospitals achieved only 29%, 33%, and less than 1% of the total possible points for their cafeteria, vending machines, and gift shops sections, respectively; overall, hospitals scored 25% of the total possible points. Large facility size and contracted food service operations were associated with some healthy practices in hospital cafeterias, but we found no association between these variables and the sectional or overall nutrition composite scores. Conclusion The average consumer nutrition environment of hospitals in this sample was minimally conducive to healthful eating. Nutrition-related interventions are warranted in hospital settings. PMID:23823699

  17. Using smart card technology to monitor the eating habits of children in a school cafeteria: 1. Developing and validating the methodology.

    Science.gov (United States)

    Lambert, N; Plumb, J; Looise, B; Johnson, I T; Harvey, I; Wheeler, C; Robinson, M; Rolfe, P

    2005-08-01

    The aim of the study was to test the feasibility of using smart card technology to track the eating behaviours of nearly a thousand children in a school cafeteria. Within a large boys' school a smart card based system was developed that was capable of providing a full electronic audit of all the individual transactions that occurred within the cafeteria. This dataset was interfaced to an electronic version of the McCance and Widdowson composition of foods dataset. The accuracy of the smart card generated data and the influence of portion size and wastage were determined empirically during two 5-day trials. The smart card system created succeeded in generating precise data on the food choices made by hundreds of children over an indefinite time period. The data was expanded to include a full nutrient analysis of all the foods chosen. The accuracy of this information was only constrained by the limitations facing all food composition research, e.g. variations in recipes, portion sizes, cooking practices, etc. Although technically possible to introduce wastage correction factors into the software, thereby providing information upon foods consumed, this was not seen as universally practical. The study demonstrated the power of smart card technology for monitoring food/nutrient choice over limitless time in environments such as school cafeterias. The strengths, limitations and applications of such technology are discussed.

  18. A study of the importance of education and cost incentives on individual food choices at the Harvard School of Public Health cafeteria.

    Science.gov (United States)

    Michels, Karin B; Bloom, Barry R; Riccardi, Paul; Rosner, Bernard A; Willett, Walter C

    2008-02-01

    To investigate the importance of cost and awareness of health- or disease-promoting properties of foods and meals for choices by customers of a cafeteria. A non-randomized intervention study. A medium size cafeteria in the Harvard School of Public Health. Customers of the cafeteria mainly consisting of public health students, faculty, and school staff and workers from the medical campus. The purchase of healthy foods and dishes was subsidized and their prices reduced by 20%. This promotion was accompanied by the distribution of educational material. Change in consumption of healthy and less healthy foods. The geometric mean was used to calculate the change in consumption. During the intervention, we observed a 6% increase in the consumption of healthy foods (95% confidence interval [CI]; 5% to 8%), and a 2% decline in the consumption of less-healthy foods (95% CI; -1% to -4%). After the prices returned to their original levels, the consumption of healthy foods increased further to 17% (95% CI; 13% to 20%) and a 2% decline in the consumption of less-healthy foods (95% CI; % 1 to -5%) persisted. Subsidizing healthful meals and educating consumers about the importance of a healthy diet can result in a modest increase in the selection of healthy foods and meals that can be maintained beyond the periods of subsidy and promotion.

  19. Las aplicaciones interactivas multimedia en España: ¿hacia dónde evoluciona el mercado?

    Directory of Open Access Journals (Sweden)

    Lic. Nati Ramajo Hernández

    1998-01-01

    Full Text Available El despegue del sector multimedia en nuestro país (entendiendo como tal las aplicaciones interactivas multimedia ha sido espectacular en los últimos tiempos. El número de títulos publicados en CD-ROM, al igual que el número de productores, ha aumentado considerablemente. Pero, ¿cómo es esa nueva industria?, ¿qué productos ofrece?, ¿hacia dónde evoluciona el mercado? El presente trabajo pretende hacer un repaso a la breve historia de las aplicaciones interactivas multimedia en España hasta llegar al momento actual, analizando por el camino la tipología de los productos y concluyendo con los nuevos formatos que están cambiando el mercado.

  20. EL COMPROMISO EN LA TEORÍA DE LA VALORACIÓN: CONCEPTOS Y APLICACIONES PEDAGÓGICAS

    Directory of Open Access Journals (Sweden)

    Jesús David Guerra Lyons

    2017-01-01

    Full Text Available El presente artículo revisa el concepto de compromiso desde la Teoría de la Valoración propuesta por Martin y White y de algunas de sus aplicaciones pedagógicas. Desde la perspectiva bajtiniana de dialogismo, Martin y White definen el compromiso como el conjunto de recursos mediante los cuales los usuarios del lenguaje entran en diálogo con las múltiples voces que inevitablemente permean sus textos, aceptándolas, rebatiéndolas, retomándolas o distanciándose de ellas. El compromiso se divide en dos tipos: monoglosia y heteroglosia. Este último se desagrega en varias subcategorías, que son definidas e ilustradas con ejemplos tomados del corpus del español de Davies. Consideramos algunas aplicaciones pedagógicas del concepto de compromiso mediante la revisión de estudios desarrollados principalmente en el contexto latinoamericano.

  1. Enfoques diferentes para medir el valor en riesgo (VaR y su comparación. Aplicaciones

    Directory of Open Access Journals (Sweden)

    Josefina Martínez Barbeito

    2005-01-01

    Full Text Available Se inicia la ponencia con una sucinta revisión de los conceptos del VAR. A continuación, se consideran y valoran de forma crítica los distintos enfoques para medir el VAR: Delta-Normal; Delta-Gamma; Simulación histórica; Simulación Monte Carlo y Contraste Estrés. Finalmente, se hace referencia a algunas aplicaciones del VAR.

  2. Análisis de eficiencia en arquitecturas multiprocesador para aplicaciones de transmisión y procesamiento de datos

    OpenAIRE

    Osio, Jorge R.; Salvatore, Juan Eduardo; Kunysz, Eduardo; Guarepi, V. L.; Morales, Daniel Martín

    2016-01-01

    Los principales lineamientos de investigación de este proyecto se orientan a las Arquitecturas que posibilitan el procesamiento paralelo, principalmente en sistemas multi-core. Por otro lado, la optimización de estos sistemas se orienta a determinadas aplicaciones de telemedicina y de sistemas ópticos basados en MIOC , (Multifunction Integrated Optical Chip), que requieren procesamiento y transmisión de datos de forma remota. Paralelamente a estos lineamientos el proyecto contempla el e...

  3. DESCRIPCIÓN DE UN FRAMEWORK METODOLOGICO PARA EL DESARROLLO DE APLICACIONES RELACIONADAS CON EL PATRIMONIO CULTURAL

    Directory of Open Access Journals (Sweden)

    Edwin Mauricio Hincapié-Montoya

    2014-01-01

    Full Text Available Preservar los espacios y difundirlos es una función social que debe mantener unidos a los pueblos y que no puede dejarse a un lado por el clamor y la voz del desarrollo. Para ello la tecnología juega un papel de facilitador mediático a través de la cual se puede llegar a diferentes espacios y lugares históricamente importantes pero físicamente inaccesibles por su desaparición. En los últimos años se han desarrollado aplicaciones que buscan reactivar el patrimonio cultural y hacen uso de tecnologías como realidad virtual, realidad aumentada o juegos serios. Sin embargo, la mayoría son casos de estudio en un tema particular y el área carece de un framework metodológico, que guie y facilite el desarrollo de este tipo de aplicaciones. En este articulo proponemos un framework metodológico conceptual, el cual busca guiar el desarrollo de aplicaciones relacionadas con la reactivación del patrimonio cultural al tiempo que maximiza el aprendizaje de los usuarios en este tema.

  4. Effect of low molecular grape seed proanthocyanidins on blood pressure and lipid homeostasis in cafeteria diet-fed rats.

    Science.gov (United States)

    Pons, Z; Guerrero, L; Margalef, M; Arola, L; Arola-Arnal, A; Muguerza, B

    2014-06-01

    Cardiovascular disease (CVD) and related pathologies are the leading cause of death worldwide. Fruits and vegetables are known to improve CVD, an effect that has been associated with flavonoid intake. The aim of this study was to simultaneously evaluate the acute effect of a low molecular grape seed proanthocyanidin extract (LM-GSPE) on two of the main risk factors of CVD, high blood pressure (BP) and dyslipidaemia, using high-fat diet-fed rats. Therefore, male Wistar rats that were cafeteria diet fed for 10 weeks were administered with 375 mg/kg of body weight of LM-GSPE, and the BP as well as plasmatic and hepatic parameters were determined at 6 h post-administration. The BP and plasmatic and hepatic lipid were decreased 6 h after the LM-GSPE administration. Moreover, the liver lipid peroxidation products decreased after the LM-GSPE treatment, indicating a reduction in oxidative stress. However, hepatic-reduced glutathione or plasma angiotensin converting enzyme activity was not altered by the LM-GSPE. In conclusion, grape proanthocyanidins is able to simultaneously reduce more than one risk factor for CVD by decreasing the BP and improving hypertriglyceridaemia at least in part due to an improvement in oxidative stress. These results open up the possibility of using grape proanthocyanidins in functional foods for CVD improvement.

  5. Comparative effect of Camellia sinensis teas on object recognition test deficit and metabolic changes induced by cafeteria diet.

    Science.gov (United States)

    Soares, Melina Bucco; Ramalho, Juliana Bernera; Izaguirry, Aryele Pinto; Pavin, Natasha Frasson; Spiazzi, Cristiano Chiapinotto; Schimidt, Helen Lidiane; Mello-Carpes, Pâmela Billig; Santos, Francielli Weber

    2017-12-27

    Consumption of high-fat and high-sugar diets in Western countries has increased significantly causing major global health problems including metabolic syndrome and obesity. In addition, studies have suggested that obesity can lead to learning and memory deficits. In this context, the use of natural compounds with low costs, minor side effects and increased antioxidant activity, such as teas, could reduce the damages induced by obesity. We investigated the effect of white, green, red, and black teas (Camellia sinensis) and their possible neuroprotective mechanisms in an experimental obesity model induced by a cafeteria diet (CD). Female Swiss mice (20-30 g) were used; they received a normal diet or a hypercaloric diet (CD) during 8 weeks. Concomitantly, some mice received orally white, green, red, or black teas (1% dose) or water. The mice subjected to CD showed weight gain, body fat accumulation, increased glucose, cholesterol, and triglycerides, associated to recognition memory deficits and increased reactive species (RS) levels and acetylcholinesterase (AChE) activity in the hippocampus. All teas significantly reduced AChE activity and partially reduced fat accumulation. Green and red teas reduced memory deficit. White, green, and black teas reduced RS levels, while only green and black tea reduced plasma triglyceride levels. According to the results obtained it is possible to conclude that green tea was better than other teas in reducing effects of the CD model, being able to protect a greater number of parameters.

  6. Cafeteria diet differentially alters the expression of feeding-related genes through DNA methylation mechanisms in individual hypothalamic nuclei.

    Science.gov (United States)

    Lazzarino, Gisela Paola; Andreoli, María Florencia; Rossetti, María Florencia; Stoker, Cora; Tschopp, María Virgina; Luque, Enrique Hugo; Ramos, Jorge Guillermo

    2017-07-15

    We evaluated the effect of cafeteria diet (CAF) on the mRNA levels and DNA methylation state of feeding-related neuropeptides, and neurosteroidogenic enzymes in discrete hypothalamic nuclei. Besides, the expression of steroid hormone receptors was analyzed. Female rats fed with CAF from weaning increased their energy intake, body weight, and fat depots, but did not develop metabolic syndrome. The increase in energy intake was related to an orexigenic signal of paraventricular (PVN) and ventromedial (VMN) nuclei, given principally by upregulation of AgRP and NPY. This was mildly counteracted by the arcuate nucleus, with decreased AgRP expression and increased POMC and kisspeptin expression. CAF altered the transcription of neurosteroidogenic enzymes in PVN and VMN, and epigenetic mechanisms associated with differential promoter methylation were involved. The changes observed in the hypothalamic nuclei studied could add information about their differential role in food intake control and how their action is disrupted in obesity. Copyright © 2017 Elsevier B.V. All rights reserved.

  7. Application of Pressure Equipment Standard at nuclear power plants; Aplicacion del Reglamento de Equipos a Presion a las centrales nucleares

    Energy Technology Data Exchange (ETDEWEB)

    Mostaza, J. M.

    2011-07-01

    Regarding with the paper presented on 9{sup t}h June 2011 referred to the Industrial Security standard in Nuclear Plants, it was about the application of Pressure Equipment standard to mentioned Nuclear Plants, this article is an extract of the paper going to be exposed. (Author)

  8. Internet applications in nuclear power plant operation management; Aplicaciones de internet en la gestion de la explotacion de centrales nucleares

    Energy Technology Data Exchange (ETDEWEB)

    Munoz, M. [Empresarios Agrupados, A. I. E. Madrid (Spain)

    2000-07-01

    The use of the Internet is quickly becoming widespread in practically all areas of business and industry. The nuclear industry should not remain indifferent to this new trend. This paper analyses some of the Internet applications that can be easily adapted to nuclear power plant operation management, including. (Author)

  9. El potencial de las aplicaciones educativas en el proceso de evaluación formativa

    Directory of Open Access Journals (Sweden)

    Mayara Lustosa de Oliveira

    2017-07-01

    Full Text Available El debate sobre los objetivos reales de la evaluación no es nuevo. Sin embargo, todavía predominan aspectos como la excesiva valoración de la memoria, lo que refleja una visión tradicional y limitada. Es necesario superar el uso exclusivo de la evaluación tradicional con el fin de adoptar una evaluación formativa, modalidad que busca identificar las fallas y necesidades de los estudiantes durante el proceso educativo con el fin de recibir retroalimentación para tomar las medidas necesarias que permitan mejorar la enseñanza y el aprendizaje. Siguiendo esta necesidad, y buscando ayudar a los profesores en la aplicación de una evaluación formativa, algunos recursos tecnológicos han sido desarrollados. El presente trabajo tiene como objetivo describir el potencial de tres aplicaciones (Armet, The Cell y 3DClass en el proceso de evaluación formativa usando las bases de datos asociadas a cada aplicación. Los resultados muestran que estas aplicaciones proporcionan métricas de evaluación más transparentes, coherentes y que permiten al profesor sistematizar criterios e indicadores, lo que reduce la subjetividad del proceso de evaluación formativa y el tiempo necesario para la preparación, tabulación y análisis de datos. Gracias a que con esta tecnología es posible verificar en tiempo real el número de errores totales y por pregunta preguntas con el mayor número de errores recurrentes, preguntas con el mayor y menor índice de aciertos y el tiempo que los alumnos emplean para desarrollar la actividad, es posible determinar el progreso de los alumnos a lo largo del tiempo e identificar puntualmente dónde ocurren los errores; esto permite una investigación minuciosa sobre sus posibles causas. Esta información facilita la retroalimentación para los alumnos, ya sea como intervenciones puntuales o direccionadas por parte del profesor.

  10. Microencapsulación con alginato en alimentos. Técnicas y aplicaciones

    Directory of Open Access Journals (Sweden)

    Bryshila Lupo Pasin

    2012-01-01

    Full Text Available El objetivo de este trabajo fue realizar una revisión de las técnicas de microencapsulación con alginato para aplicaciones en alimentos. El alginato ha sido uno de los polímeros más empleado en la microencapsulación, este forma una matriz altamente versátil, biocompatible y no tóxica para la protección de componentes activos, células o microorganismos sensibles al calor, pH, oxígeno y luz, entre otros factores, a los que son expuestos los alimentos durante el procesamiento y almacenaje. El proceso de microencapsulación con alginato se lleva a cabo a través de dos mecanismos de gelificación iónica: la gelificación externa y la gelificación interna, dependiendo de si el calcio se suministra desde fuera de las cápsulas o en el interior de las mismas. Para la preparación de microcápsulas de alginato de calcio con aplicaciones alimentarias, se tienen las técnicas por extrusión, en emulsión y secado por atomización. Aunque el secado por atomización ha sido para la industria un proceso práctico y económico, su aplicación con alginato se ha visto limitada por la viscosidad y velocidad de gelificación. Por el contrario, la técnica por extrusión ha sido la técnica tradicional empleada en las últimas décadas, debido a la uniformidad de las microcápsulas en su forma y tamaño. En este sentido, la técnica en emulsión es la aplicada más recientemente, la cual ha demostrado ser sencilla y de producción a gran escala. En la actualidad se desarrollan nuevas tecnologías a fin de disminuir el tamaño de las microcápsulas para así ampliar sus usos en la industria. Entre las últimas tendencias de microencapsulación, se estudian sistemas mixtos de matrices poliméricas con la finalidad de obtener propiedades físico-químicas combinadas, permitiendo hacer el proceso de encapsulación más eficiente tanto para la protección como para la liberación controlada del principio activo.

  11. Microencapsulación con alginato en alimentos. Técnicas y aplicaciones

    Directory of Open Access Journals (Sweden)

    Bryshila Lupo Pasin

    2012-06-01

    Full Text Available El objetivo de este trabajo fue realizar una revisión de las técnicas de microencapsulación con alginato para aplicaciones en alimentos. El alginato ha sido uno de los polímeros más empleado en la microencapsulación, este forma una matriz altamente versátil, biocompatible y no tóxica para la protección de componentes activos, células o microorganismos sensibles al calor, pH, oxígeno y luz, entre otros factores, a los que son expuestos los alimentos durante el procesamiento y almacenaje. El proceso de microencapsulación con alginato se lleva a cabo a través de dos mecanismos de gelificación iónica: la gelificación externa y la gelificación interna, dependiendo de si el calcio se suministra desde fuera de las cápsulas o en el interior de las mismas. Para la preparación de microcápsulas de alginato de calcio con aplicaciones alimentarias, se tienen las técnicas por extrusión, en emulsión y secado por atomización. Aunque el secado por atomización ha sido para la industria un proceso práctico y económico, su aplicación con alginato se ha visto limitada por la viscosidad y velocidad de gelificación. Por el contrario, la técnica por extrusión ha sido la técnica tradicional empleada en las últimas décadas, debido a la uniformidad de las microcápsulas en su forma y tamaño. En este sentido, la técnica en emulsión es la aplicada más recientemente, la cual ha demostrado ser sencilla y de producción a gran escala. En la actualidad se desarrollan nuevas tecnologías a fin de disminuir el tamaño de las microcápsulas para así ampliar sus usos en la industria. Entre las últimas tendencias de microencapsulación, se estudian sistemas mixtos de matrices poliméricas con la finalidad de obtener propiedades físico-químicas combinadas, permitiendo hacer el proceso de encapsulación más eficiente tanto para la protección como para la liberación controlada del principio activo.

  12. La evaluación de las aplicaciones de lectura web: un paso más en el proceso de editorialización de la web

    Directory of Open Access Journals (Sweden)

    Noelia Patón Rodríguez

    2016-11-01

    Full Text Available En el desarrollo de la lectura digital confluyen una serie de factores que pasan entre otras cuestiones por la evolución tecnológica de los dispositivos y el desarrollo de numerosas aplicaciones que facilitan la lectura al tiempo que está provocando cambios en los hábitos de lectura tal y como lo demuestran los diferentes informes. Uno de los desarrollos tecnológicos está relacionado con el diseño de aplicaciones específicas para la lectura en la pantalla del ordenador, son las llamadas aplicaciones de lectura web. En este artículo, tras definir qué son las aplicaciones de lectura web se explican los objetivos y el proceso seguido para la selección, definición y sistematización de los parámetros que servirán para la evaluación de las aplicaciones de lectura web.

  13. APLICACIONES PARA REDES VANET ENFOCADAS EN LA SOSTENIBILIDAD AMBIENTAL, UNA REVISIÓN SISTEMÁTICA

    Directory of Open Access Journals (Sweden)

    Oscar Orozco Sarasti

    2014-01-01

    Full Text Available La alta demanda de energía en sectores clave de la productividad incita a una búsqueda permanente de nuevas formas de utilizar los recursos naturales no renovables, que contribuya al mejoramiento de aspectos como sostenibilidad y eficiencia. Los Sistemas Inteligentes de Transporte Verdes buscan el mejoramiento de la movilidad, la reducción de la accidentalidad y la mitigación del impacto ambiental mediante la gestión inteligente del tráfico vehicular a través de las Tecnologías de la Información y las Comunicaciones (TIC. Este artículo presenta una revisión de las Redes Vehiculares Ad hoc (VANET, sus características y enfoques, además de la clasificación de sus aplicaciones, los modelos de movilidad utilizados, y una caracterización para el modelado del tráfico vehicular, junto con sus particularidades, en Colombia. Se concluye con la tendencia actual de simulación y el desarrollo futuro del proyecto de investigación.

  14. Applications of portals in the energetic sector; Aplicaciones de portales en el sector energetico

    Energy Technology Data Exchange (ETDEWEB)

    Santos Dominguez, Martin; Arroyo Figueroa, Gustavo [Instituto de Investigaciones Electricas, Temixco, Morelos (Mexico)

    2000-07-01

    An operative portal joins the applications, contents and services of the company in a single page of Intranet such way that promises to change deeply the information technology in the next years. The corporative portals will change what people visualize in the screen of their computer at the beginning of every working day. Unlike seeing the network (Web) only with pages of language of hypertext bearing (HTML), the corporative portal acts as a gate between Internet and the private networks. This article presents a general vision of the benefits of the corporative portals, the existing technologies and the potential markets. [Spanish] Un portal operativo une las aplicaciones, contenidos y servicios de la empresa en una sola pagina de Intranet, de tal forma que promete cambiar, profundamente la tecnologia de la informacion en los proximos anos. Los portales corporativos cambiaran lo que la gente visualiza en la pantalla de su computadora al comienzo de cada dia de trabajo. A diferencia de ver la red (Web) solo con paginas de lenguaje de marcacion de hipertexto (HTML), el portal corporativo actua como compuerta entre Internet y las redes privadas. Este articulo presenta una vision general de los beneficios de los portales corporativos, las tecnologias y los mercados potenciales existentes.

  15. Introducción a los algoritmos genéticos y sus aplicaciones

    Directory of Open Access Journals (Sweden)

    Piedad Tolmos Rodríguez-Piñero

    2002-01-01

    Full Text Available Los algoritmos genéticos son un logro más de la Inteligencia Artificial en su intento de replicar comportamientos biológicos, con los avances científicos que ello implica, mediante la computación. Se trata de algoritmos de búsqueda basados en la mecánica de la selección natural y de la genética. Utilizan la información histórica para encontrar nuevos puntos de búsqueda de una solución óptima del problema planteado, con esperanzas de mejorar los resultados. En el presente artículo se realizará una introducción a los Algoritmos Genéticos: qué son, de dónde proceden, y en qué difieren de otros métodos de búsqueda, comentándose, asimismo, sus aplicaciones principales.

  16. E-participación en el Senado chileno: ¿aplicaciones deliberativas?

    Directory of Open Access Journals (Sweden)

    Eduardo Araya Moreno

    2009-01-01

    Full Text Available Las Tecnologías de la Información y Comunicación (TIC´s han traído una serie de promesas para la participación ciudadana y el establecimiento de una relación más estrecha y cercana en tre las autoridades políticas y los ciudadanos. En Chile, el Senado ha llevado dos programas (Senador Virtual y Chat de los senadores que permiten a los ciudadanos mantenerse en contacto con los senadores y dar sus puntos de vista en temas discutidos en el legislativo. Este artículo estudia cómo estos programas posibilitan a los ciudadanos engancharse en de bates en torno a asuntos públicos y a la agenda legislativa. En específico, estudia cómo estas aplicaciones han funcionado y se evalúa si logran cumplir con el ideal normativo de la deliberación, que inspira el de bate académico en torno a las TIC´s y política.

  17. Aplicaciones de la teoría del control a la economía

    Directory of Open Access Journals (Sweden)

    Wolf Kerpel S.

    1986-01-01

    Full Text Available La teoría del control se ha desarrollado y aplicado ampliamente en muchas áreas de la Ingeniería. En los últimos años se ha venido aplicando también, en campos diferentes a los de la ingeniería como por ejemplo en Ecología, Economía, diversas áreas de Biología, Sicología, etc.; con excelentes resultados. Los éxitos conseguidos derivan entre otros del hecho de que dichos campos encierran procesos claramente identificables como de control, y, evidentemente también, del gran avance logrado en el desarrollo de la teoría del control. En este articulo nos ocuparemos de las aplicaciones de la teoría del control a la Economía, específicamente a los modelos macroeconómicos. El trabajo es básicamente una recopilación de información relacionada con el tema, y pretende despertar el interés por él en nuestro medio. Al final se presenta una bibliografía extensa.

  18. Aplicaciones de la redes de Petri en la construcción

    Directory of Open Access Journals (Sweden)

    Recuero, Alfonso

    1997-02-01

    Full Text Available Petri nets is a very important tool for the analysis of dynamic systems. It should be know by all experts in computational science. Their most important applications in building are in fabrication processes and in the exchange of electronic messages among the different participants in the building process. In this work, a brief description of Petri nets is presented, and their application to message interchange is shown.

    Las redes de Petri son una herramienta muy importante para el análisis de sistemas dinámicos, herramienta que debiera ser conocida por cualquier experto en ciencias de la computación. Dentro del campo de la construcción, sus aplicaciones más claras están en la fabricación de materiales y elementos y en el intercambio de mensajes electrónicos entre los distintos participantes en el proceso constructivo. En este trabajo se presenta una sucinta descripción de las redes de Petri, mostrando su aplicación al intercambio de mensajes.

  19. XEROGELES DE CARBONO COMPETITIVOS DISEÑADOS PARA APLICACIONES ESPECÍFICAS

    Directory of Open Access Journals (Sweden)

    Ángel H. Moreno

    2013-01-01

    Full Text Available A pesar de su gran potencial, los xerogeles de carbono no se producen a gran escala debido a los largos y tediosos procesos tradicionales de obtención. El objetivo ha sido desarrollar un nuevo método de síntesis que permita su producción a gran escala de forma competitiva, sin perder el control de las propiedades y la posibilidad de producirlos a medida de cada aplicación. En este trabajo se presenta un nuevo proceso de obtención que permite reducir notablemente el tiempo del proceso de síntesis (>75% y utilizando un único dispositivo, constituyendo un paso muy importante para la implementación a escala industrial de la producción de xerogeles de carbono. En este trabajo se presentan resultados notables de dichos xerogeles de carbono en aplicaciones tan diversas como el almacenamiento de hidrógeno, como material activo en supercondensadores o como material de relleno en columnas de separación de gases, mostrando la gran versatilidad de estos materiales.

  20. APLICACIONES DE LA CITOMETRÍA DE FLUJO EN MICROBIOLOGÍA, VETERINARIA Y AGRICULTURA

    Directory of Open Access Journals (Sweden)

    José Laguado

    2007-12-01

    Full Text Available La citometría de flujo es un método automatizado, multiparamétrico y cuantitativo que analiza las señales dispersadas y fluorescentes producidas por una célula al pasar por un haz de luz. El potencial de los nuevos métodos de análisis en el laboratorio en el campo de la microbiología viene creciendo de manera enorme en los últimos años donde la citometría de flujo se ha consolidando como una herramienta rápida, sencilla, suficientemente sensible, económica, de fácil automatización para las crecientes necesidades de desarrollo de Colombia. La citometría permite obtener información sobre la fisiología, morfología, genética y diversidad de microorganismos, animales y plantas. Las variadas aplicaciones de la citometría en la microbiología de alimentos, la microbiología ambiental, la medicina veterinaria y la agricultura busca ahora complementar o reemplazar técnicas ya existentes adaptándonos a la continua evolución de las necesidades de los mercados globales de la ciencia y la economía.

  1. Aplicaciones educativas de la teoría Vygotskiana. El programa "key to learning"

    Directory of Open Access Journals (Sweden)

    Moisés Esteban Guitart

    2011-01-01

    Full Text Available En ciencias de la educación, las últimas décadas han estado marcadas por un interés en las ideas de Lev S. Vygotski. De hecho, a partir de esas ideas se han propuesto varias aplicaciones educativas. Una de ellas es el "Key to learning". El artículo propone una visión general de este programa educativo desarrollado a partir de algunos trabajos e ideas de autores rusos contemporáneos. Primero, desarrollamos algunas ideas en torno a la noción de zona de desarrollo próximo (ZpD. Después, sugerimos la teoría de las habilidades de aprendizaje. En este sentido, el objetivo principal de "Key to learning" es mejorar las habilidades de aprendizaje cognitivas, comunicativas y directivas de niños de entre 3 a 7 años de edad. Para este propósito son creadas 12 unidades curriculares que componen el programa. Para concluir se enfatiza la creación de zonas de desarrollo próximo estructuradas como parte de un sistema de enseñanza y aprendizaje que vincula la actividad, la asistencia y la agencia.

  2. VULNERABILIDAD DE REDES COMPLEJAS Y APLICACIONES AL TRANSPORTE URBANO: UNA REVISIÓN DE LA LITERATURA

    Directory of Open Access Journals (Sweden)

    Laura Lotero Vélez

    Full Text Available El interés de investigadores y profesionales de diversas disciplinas en el análisis de sistemas sociales, biológicos y artificiales desde la perspectiva de las redes complejas ha crecido notablemente en los últimos años. Algunas de estas redes son la base de muchas de las actividades del ser humano, como es el caso de las redes de transporte urbano que hacen parte de la infraestructura crítica. Una de las propiedades de mayor relevancia práctica de las redes complejas es su capacidad para mantener algunas funciones cuando ocurren fallas, errores o ataques a sus nodos o vínculos, la cual ha sido denominada robustez, resiliencia o vulnerabilidad por distintos autores. En este artículo se presenta una revisión de la literatura sobre el concepto de vulnerabilidad en el formalismo de las redes complejas y algunas aplicaciones al transporte urbano. El propósito de este artículo de revisión es el de dar a conocer a académicos y tomadores de decisión nuevos enfoques para el análisis del sistema de movilidad.

  3. Aplicaciones de la toxina botulínica en afecciones palpebrales

    Directory of Open Access Journals (Sweden)

    Irene Rojas-Rondón

    Full Text Available La toxina botulínica es un potente inhibidor neuromuscular altamente específico que produce una denervación química al bloquear la liberación de acetilcolina en la placa motora. Es sintetizada por Clostridium botulinum. Es un fármaco de alto valor terapéutico en las alteraciones de los anexos oculares; puede indicarse con muy buenos resultados en afecciones como el blefarospasmo primario, el espasmo hemifacial, el chalazión, el entropion espasmódico, la retracción palpebral, la ptosis de la ceja, la mioquimia palpebral y en el tratamiento de líneas de expresión facial, con muy buenos resultados estéticos. Se realizó una búsqueda bibliográfica y en Internet utilizando distintas bases de datos como Medline, Google, Bireme, PubMed.gov, así como artículos relevantes de la Academia americana de Oftalmología y Neurología con el objetivo de describir las aplicaciones de la neurotóxica botulínica en las afecciones de los anexos oculares.

  4. A Novel Role of SIRT1/ FGF-21 in Taurine Protection Against Cafeteria Diet-Induced Steatohepatitis in Rats.

    Science.gov (United States)

    Abd Elwahab, Azza H; Ramadan, Basma K; Schaalan, Mona F; Tolba, Amina M

    2017-01-01

    Non-alcoholic fatty liver disease (NAFLD) is one of the alarmingly rising clinical problems in the 21st century with no effective drug treatment until now. Taurine is an essential amino acid in humans that proved efficacy as a non-pharmacological therapy in a plethora of diseases; however, its impact on NAFLD remains elusive. The aim of the current study is to evaluate the protective mechanism of taurine in experimental steatohepatitis induced by junk food given as cafeteria-diet (CAF-D) in male albino rats. Forty adult male albino rats of local strain between 8-10 weeks old, weighing 150 ± 20 g, were divided into four equal groups: Group I (control group), Group II (Taurine group), Group III (CAF-D for 12 weeks) and Group IV (CAF-D +Taurine). CAF-D was given in addition to the standard chow for 12 weeks, where each rat was given one piece of beef burger fried in 15 g of sunflower oil, one teaspoonful of mayonnaise, and one piece of petit pan bread, weighing 60g/ piece. In the serum, liver function tests; ALT, AST, ALP, GGT and the lipid profile; TG, TC, HDL-C added to reduced glutathione (GSH) were assessed colorimetrically, while fibroblast growth factor (FGF)-21, adiponectin & interleukin (IL)-6 via ELISA. The same technique was used for the assays of the hepatic levels of FGF-21, silent information regulator (SIRT1), malondialdehyde (MDA),IL-10, tumor necrosis factor-α (TNF-α) as well as the apoptotic markers; caspase-3 and B-cell lymphoma (Bcl-2). The cafeteria-diet induced steatohepatitis was reflected by significantly increased body and liver weight gain, elevation of liver enzymes; ALT, AST, ALP and GGT added to the dyslipidemic panel, presented as increased TC, TG, LDL-C and decreased HDL-C levels. The steatosis-induced inflammatory milieu, marked by elevated serum levels of FGF-21, IL-6, hepatic TNF-α, as well as reduced IL-10 and adiponectin, was associated with steatosis- induced hepatic oxidative stress, reflected by increased hepatic MDA and

  5. A Novel Role of SIRT1/ FGF-21 in Taurine Protection Against Cafeteria Diet-Induced Steatohepatitis in Rats

    Directory of Open Access Journals (Sweden)

    Azza H. Abd Elwahab

    2017-09-01

    Full Text Available Background: Non-alcoholic fatty liver disease (NAFLD is one of the alarmingly rising clinical problems in the 21st century with no effective drug treatment until now. Taurine is an essential amino acid in humans that proved efficacy as a non-pharmacological therapy in a plethora of diseases; however, its impact on NAFLD remains elusive. The aim of the current study is to evaluate the protective mechanism of taurine in experimental steatohepatitis induced by junk food given as cafeteria-diet (CAF-D in male albino rats. Methods: Forty adult male albino rats of local strain between 8-10 weeks old, weighing 150 ± 20 g, were divided into four equal groups: Group I (control group, Group II (Taurine group, Group III (CAF-D for 12 weeks and Group IV (CAF-D +Taurine. CAF-D was given in addition to the standard chow for 12 weeks, where each rat was given one piece of beef burger fried in 15 g of sunflower oil, one teaspoonful of mayonnaise, and one piece of petit pan bread, weighing 60g/ piece. In the serum, liver function tests; ALT, AST, ALP, GGT and the lipid profile; TG, TC, HDL-C added to reduced glutathione (GSH were assessed colorimetrically, while fibroblast growth factor (FGF-21, adiponectin & interleukin (IL-6 via ELISA. The same technique was used for the assays of the hepatic levels of FGF-21, silent information regulator (SIRT1, malondialdehyde (MDA,IL-10, tumor necrosis factor-α (TNF-α as well as the apoptotic markers; caspase-3 and B-cell lymphoma (Bcl-2. Results: The cafeteria-diet induced steatohepatitis was reflected by significantly increased body and liver weight gain, elevation of liver enzymes; ALT, AST, ALP and GGT added to the dyslipidemic panel, presented as increased TC, TG, LDL-C and decreased HDL-C levels. The steatosis-induced inflammatory milieu, marked by elevated serum levels of FGF-21, IL-6, hepatic TNF-α, as well as reduced IL-10 and adiponectin, was associated with steatosis- induced hepatic oxidative stress

  6. Validity and Interrater Reliability of the Visual Quarter-Waste Method for Assessing Food Waste in Middle School and High School Cafeteria Settings.

    Science.gov (United States)

    Getts, Katherine M; Quinn, Emilee L; Johnson, Donna B; Otten, Jennifer J

    2017-11-01

    Measuring food waste (ie, plate waste) in school cafeterias is an important tool to evaluate the effectiveness of school nutrition policies and interventions aimed at increasing consumption of healthier meals. Visual assessment methods are frequently applied in plate waste studies because they are more convenient than weighing. The visual quarter-waste method has become a common tool in studies of school meal waste and consumption, but previous studies of its validity and reliability have used correlation coefficients, which measure association but not necessarily agreement. The aims of this study were to determine, using a statistic measuring interrater agreement, whether the visual quarter-waste method is valid and reliable for assessing food waste in a school cafeteria setting when compared with the gold standard of weighed plate waste. To evaluate validity, researchers used the visual quarter-waste method and weighed food waste from 748 trays at four middle schools and five high schools in one school district in Washington State during May 2014. To assess interrater reliability, researcher pairs independently assessed 59 of the same trays using the visual quarter-waste method. Both validity and reliability were assessed using a weighted κ coefficient. For validity, as compared with the measured weight, 45% of foods assessed using the visual quarter-waste method were in almost perfect agreement, 42% of foods were in substantial agreement, 10% were in moderate agreement, and 3% were in slight agreement. For interrater reliability between pairs of visual assessors, 46% of foods were in perfect agreement, 31% were in almost perfect agreement, 15% were in substantial agreement, and 8% were in moderate agreement. These results suggest that the visual quarter-waste method is a valid and reliable tool for measuring plate waste in school cafeteria settings. Copyright © 2017 Academy of Nutrition and Dietetics. Published by Elsevier Inc. All rights reserved.

  7. Identification of a nutrient-sensing transcriptional network in monocytes by using inbred rat models on a cafeteria diet.

    Science.gov (United States)

    Martínez-Micaelo, Neus; González-Abuín, Noemi; Terra, Ximena; Ardévol, Ana; Pinent, Montserrat; Petretto, Enrico; Behmoaras, Jacques; Blay, Mayte

    2016-10-01

    Obesity has reached pandemic levels worldwide. The current models of diet-induced obesity in rodents use predominantly high-fat based diets that do not take into account the consumption of variety of highly palatable, energy-dense foods that are prevalent in Western society. We and others have shown that the cafeteria (CAF) diet is a robust and reproducible model of human metabolic syndrome with tissue inflammation in the rat. We have previously shown that inbred rat strains such as Wistar Kyoto (WKY) and Lewis (LEW) show different susceptibilities to CAF diets with distinct metabolic and morphometric profiles. Here, we show a difference in plasma MCP-1 levels and investigate the effect of the CAF diet on peripheral blood monocyte transcriptome, as powerful stress-sensing immune cells, in WKY and LEW rats. We found that 75.5% of the differentially expressed transcripts under the CAF diet were upregulated in WKY rats and were functionally related to the activation of the immune response. Using a gene co-expression network constructed from the genes differentially expressed between CAF diet-fed LEW and WKY rats, we identified acyl-CoA synthetase short-chain family member 2 (Acss2) as a hub gene for a nutrient-sensing cluster of transcripts in monocytes. The Acss2 genomic region is significantly enriched for previously established metabolism quantitative trait loci in the rat. Notably, monocyte expression levels of Acss2 significantly correlated with plasma glucose, triglyceride, leptin and non-esterified fatty acid (NEFA) levels as well as morphometric measurements such as body weight and the total fat following feeding with the CAF diet in the rat. These results show the importance of the genetic background in nutritional genomics and identify inbred rat strains as potential models for CAF-diet-induced obesity. © 2016. Published by The Company of Biologists Ltd.

  8. Identification of a nutrient-sensing transcriptional network in monocytes by using inbred rat models on a cafeteria diet

    Directory of Open Access Journals (Sweden)

    Neus Martínez-Micaelo

    2016-10-01

    Full Text Available Obesity has reached pandemic levels worldwide. The current models of diet-induced obesity in rodents use predominantly high-fat based diets that do not take into account the consumption of variety of highly palatable, energy-dense foods that are prevalent in Western society. We and others have shown that the cafeteria (CAF diet is a robust and reproducible model of human metabolic syndrome with tissue inflammation in the rat. We have previously shown that inbred rat strains such as Wistar Kyoto (WKY and Lewis (LEW show different susceptibilities to CAF diets with distinct metabolic and morphometric profiles. Here, we show a difference in plasma MCP-1 levels and investigate the effect of the CAF diet on peripheral blood monocyte transcriptome, as powerful stress-sensing immune cells, in WKY and LEW rats. We found that 75.5% of the differentially expressed transcripts under the CAF diet were upregulated in WKY rats and were functionally related to the activation of the immune response. Using a gene co-expression network constructed from the genes differentially expressed between CAF diet-fed LEW and WKY rats, we identified acyl-CoA synthetase short-chain family member 2 (Acss2 as a hub gene for a nutrient-sensing cluster of transcripts in monocytes. The Acss2 genomic region is significantly enriched for previously established metabolism quantitative trait loci in the rat. Notably, monocyte expression levels of Acss2 significantly correlated with plasma glucose, triglyceride, leptin and non-esterified fatty acid (NEFA levels as well as morphometric measurements such as body weight and the total fat following feeding with the CAF diet in the rat. These results show the importance of the genetic background in nutritional genomics and identify inbred rat strains as potential models for CAF-diet-induced obesity.

  9. Analysis of pumping systems to large flows of cooling water in power plants; Analisis de sistemas de bombeo para grandes flujos de agua de enfriamiento en centrales termoelectricas

    Energy Technology Data Exchange (ETDEWEB)

    Sanchez Sanchez, Ramon; Herrera Velarde, Jose Ramon; Gonzalez Sanchez, Angel [Instituto de Investigaciones Electricas, Cuernavaca, Morelos (Mexico)]. E-mail: rsanchez@iie.org.mx; jrhv@iie.org.mx; ags@iie.org.mx

    2010-11-15

    Accurate measurement of large water flows remains being a challenge in the problems of implementation of circulating water systems of power plants and other applications. This paper, presents a methodology for the analysis in pumping systems with high rates of water in power plants, as well as their practical application and results in pipelines water flow of a thermoelectrical power plant of 350 MW. In this power plant, the water flow per pipeline for a half of condenser oscillates around 7 m{sup 3}/s (14 m{sup 3}/s per power generating unit). In this analysis, we present the techniques used to measure large flows of water with high accurately, as well as the computational model for water circulating system using PIPE FLO and the results of practical application techniques. [Spanish] La medicion precisa de grandes flujos de agua, sigue siendo un reto en los problemas de aplicacion de sistemas de agua de circulacion de centrales termoelectricas, entre otras aplicaciones. En este articulo, se presenta una metodologia para el analisis de sistemas de bombeo con grandes flujos de agua en centrales termoelectricas, asi como, su aplicacion practica y los resultados obtenidos en los ductos de agua de circulacion de una central generadora con unidades de 350 MW. En esta central, los flujos por caja de agua oscilan alrededor de los 7 m{sup 3}/s (14 m{sup 3}/s por unidad generadora). En el analisis, se presentan las tecnicas utilizadas para medir con precision grandes flujos de agua (tubo de Pitot), asi como, el modelado del sistema de agua de circulacion por medio de un paquete computacional (PIPE FLO) y resultados obtenidos de la aplicacion de dichas tecnicas.

  10. A study on the short-term effect of cafeteria diet and pioglitazone on insulin resistance and serum levels of adiponectin and ghrelin

    Directory of Open Access Journals (Sweden)

    G. Colombo

    2012-10-01

    Full Text Available The interaction between ghrelin and adiponectin is still controversial. We investigated the effect of cafeteria diet and pioglitazone on body weight, insulin resistance, and adiponectin/ghrelin levels in an experimental study on male Wistar rats. The animals were divided into four groups of 6 rats each, and received balanced chow with saline (CHOW-O or pioglitazone (CHOW-P, or a cafeteria diet with saline (CAFE-O or pioglitazone (CAFE-P. The chow/cafeteria diets were administered for 35 days, and saline/pioglitazone (10 mg·kg body weight-1·day-1 was added in the last 14 days prior to euthanasia. CAFE-O animals had a higher mean final weight (372.5 ± 21.01 g than CHOW-O (317.66 ± 25.11 g, P = 0.017 and CHOW-P (322.66 ± 28.42 g, P = 0.035 animals. Serum adiponectin levels were significantly higher in CHOW-P (55.91 ± 20.62 ng/mL than in CHOW-O (30.52 ± 6.97 ng/mL, P = 0.014 and CAFE-O (32.54 ± 9.03 ng/mL, P = 0.027 but not in CAFE-P. Higher total serum ghrelin levels were observed in CAFE-P compared to CHOW-P animals (1.65 ± 0.69 vs 0.65 ± 0.36 ng/mL, P = 0.006. Likewise, acylated ghrelin levels were higher in CAFE-P (471.52 ± 195.09 pg/mL than in CHOW-P (193.01 ± 87.61 pg/mL, P = 0.009 and CAFE-O (259.44 ± 86.36 pg/mL, P = 0.047 animals. In conclusion, a cafeteria diet can lead to a significant weight gain. Although CAFE-P animals exhibited higher ghrelin levels, this was probably related to food deprivation rather than to a direct pharmacological effect, possibly attenuating the increase in adiponectin levels.

  11. A study on the short-term effect of cafeteria diet and pioglitazone on insulin resistance and serum levels of adiponectin and ghrelin.

    Science.gov (United States)

    Colombo, G; Bazzo, M L; Nogueira, C L; Colombo, M D H P; Schiavon, L L; d'Acampora, A J

    2012-10-01

    The interaction between ghrelin and adiponectin is still controversial. We investigated the effect of cafeteria diet and pioglitazone on body weight, insulin resistance, and adiponectin/ghrelin levels in an experimental study on male Wistar rats. The animals were divided into four groups of 6 rats each, and received balanced chow with saline (CHOW-O) or pioglitazone (CHOW-P), or a cafeteria diet with saline (CAFE-O) or pioglitazone (CAFE-P). The chow/cafeteria diets were administered for 35 days, and saline/pioglitazone (10 mg · kg body weight(-1) · day(-1)) was added in the last 14 days prior to euthanasia. CAFE-O animals had a higher mean final weight (372.5 ± 21.01 g) than CHOW-O (317.66 ± 25.11 g, P = 0.017) and CHOW-P (322.66 ± 28.42 g, P = 0.035) animals. Serum adiponectin levels were significantly higher in CHOW-P (55.91 ± 20.62 ng/mL) than in CHOW-O (30.52 ± 6.97 ng/mL, P = 0.014) and CAFE-O (32.54 ± 9.03 ng/mL, P = 0.027) but not in CAFE-P. Higher total serum ghrelin levels were observed in CAFE-P compared to CHOW-P animals (1.65 ± 0.69 vs 0.65 ± 0.36 ng/mL, P = 0.006). Likewise, acylated ghrelin levels were higher in CAFE-P (471.52 ± 195.09 pg/mL) than in CHOW-P (193.01 ± 87.61 pg/mL, P = 0.009) and CAFE-O (259.44 ± 86.36 pg/mL, P = 0.047) animals. In conclusion, a cafeteria diet can lead to a significant weight gain. Although CAFE-P animals exhibited higher ghrelin levels, this was probably related to food deprivation rather than to a direct pharmacological effect, possibly attenuating the increase in adiponectin levels.

  12. Aplicaciones de los láseres de Er:YAG y de Er,Cr:YSGG en odontologia

    OpenAIRE

    Revilla Gutiérrez, Verónica; España Tost, A. J. (Antonio Jesús); Arnabat Domínguez, Josep; Gay Escoda, Cosme

    2004-01-01

    Los láseres de Er:YAG y de Er,Cr:YSGG por su longitud de onda son bien absorbidos, tanto por el agua que contienen los tejidos blandos como por los cristales de hidroxiapatita presentes en los tejidos duros. Estas características hacen posible que estos láseres puedan ser absorbidos por los tejidos duros. Se presentan los múltiples usos y aplicaciones que tiene esta tecnología en Odontología, tanto en cirugía de tejidos blandos, como sus aplicaciones sobre tejidos duros, como por ejemplo los ...

  13. Los jóvenes como usuarios de aplicaciones de marca en dispositivos móviles

    Directory of Open Access Journals (Sweden)

    Francisco Javier Ruiz del Olmo

    2014-07-01

    Full Text Available El presente trabajo analiza el papel de los jóvenes consumidores en el contexto de los nuevos procesos comunicativos que surgen de tecnologías emergentes: el uso de las aplicaciones de marca en los dispositivos móviles. Éstos incorporan funcionalidades sociales y comunicativas cada vez más complejas y, entre ellas, las aplicaciones para teléfonos inteligentes que vinculan publicidad comercial y pagos forman un campo novedoso pero de interés prioritario para distintos actores comunicativos, como son las marcas comerciales, los servicios bancarios y las propias compañías tecnológicas. En ese contexto la presente investigación describe y codifica cualitativamente cómo los usuarios entienden, perciben y utilizan, como prosumidores, las aplicaciones de marca corporativa y los pagos. Para ello se aplican técnicas de investigación en cuatro grupos focales, de edades comprendidas entre los 18 y 24 años, compuestos por jóvenes universitarios españoles estudiantes en Comunicación, como usuarios que muestran una predisposición y una adopción temprana de estas prácticas. Las respuestas de las reuniones del grupo de discusión permitieron una clasificación de las prácticas comunicativas. En conclusión, se constata una alta predisposición de estos consumidores activos por interactuar con contenidos comerciales, estableciendo redes sociales bajo el amparo de una cultura e imagen de marca, como forma de cohesión grupal. Otros usos se relacionan con el entretenimiento y la información, al tiempo que aún se muestran reticentes al pago de productos o servicios mediante el dispositivo móvil.

  14. APLICACIONES MÓVILES MULTIPLATAFORMA PARA CONSULTAS ACADÉMICAS EN INSTITUCIONES DE EDUCACIÓN SUPERIOR

    OpenAIRE

    Herrera, Janina; Guamán, Rene

    2016-01-01

    El presente artículo se basa en un estudio realizado sobre las aplicaciones móviles multiplataforma para consultas académicas en Instituciones de Educación Superior, para lo cual se ha tomado como caso de estudio la Universidad Nacional de Loja (UNL). Durante el desarrollo de éste trabajo se realizó un análisis de las herramientas adecuadas para realizar la implementación de la aplicación, también se evaluó las metodologías de desarrollo de software para determinar la más adaptable al desarro...

  15. Desarrollo de materiales poliméricos nanocompuestos para aplicaciones eléctricas y electrónicas

    OpenAIRE

    Bruno Chinè

    2007-01-01

    Se reportan algunos resultados y procedimientos experimentales de laboratorio obtenidos en el marco de investigaciones desarrolladas para la obtención de nuevos materiales compuestosnanoestructurados. Estos nuevos materiales, formados por una fase orgánica el polímero y una fase inorgánica el silicato, están siendo fuertemente investigados en la actualidad pues se espera que puedan brindar, entre otras, mejores propiedades de aislamiento eléctrico y de retardo a la flama en aplicaciones eléct...

  16. Materiales nanocompuestos de polipropileno y nitruros de carbono, procedimiento para su obtención y aplicaciones

    OpenAIRE

    Naffakh, Mohammed; Zamora Abanades, Felix; López Fernández, Vicente; Gómez Rodríguez, Mª Ángeles

    2009-01-01

    Materiales nanocompuestos de polipropileno y nitruros de carbono, procedimiento para su obtención y aplicaciones. La presente invención se refiere a un material nanocompuesto que comprende una matriz polimérica de polipropileno y nanopartículas de nitruro de carbono, con forma esférica o elipsoidal, a su procedimiento de obtención y a sus usos en la fabricación de artículos termoplásticos, ultraligeros y ultraduros.

  17. Plan de Auditoría del desarrollo de aplicaciones en una empresa informática

    OpenAIRE

    AGUILAR ESCOBÍ, MARÍA AMPARO

    2012-01-01

    El proceso de la auditoría requiere una gran recopilación de datos, realización de pruebas y comprobación de requisitos de control. En este trabajo pretendemos, primero mostrar una visión global de la auditoría para posteriormente centrarnos en la auditoría que nos interesa en este proyecto, la auditoría de los Sistemas de desarrollo de aplicaciones informáticas, explicaremos las características que tiene la organización a la que le vamos a realizar el plan de auditoría junt...

  18. Referente de auditoría para la reutilización de aplicaciones en modo servicio

    OpenAIRE

    Fajardo Cabello, Francisco Javier

    2015-01-01

    El Cloud Computing es actualmente una pieza fundamental para la informática y para la sociedad. La importancia que ha adquirido este modelo pone de manifiesto la necesidad de establecer una normativa que regule el uso de este tipo de servicios, así como la seguridad de sus sistemas. Las aplicaciones en modo servicio pueden ser ofrecidas al cliente a través de otros sistemas además de la nube. Sin embargo, dada su proyección, este trabajo tiene como finalidad focalizarse en este tipo de com...

  19. Análisis teórico del contacto plasma-superficie y sus aplicaciones industriales

    OpenAIRE

    Tejero del Caz, Antonio

    2016-01-01

    Actualmente, la física de plasmas constituye una parte importante de la investigación en física que está siendo desarrollada. Su campo de aplicación varía desde el estudio de plasmas interestelares y cósmicos, como las estrellas, las nebulosas, el medio intergaláctico, etc.; hasta aplicaciones más terrenales como la producción de microchips o los dispositivos de iluminación. Resulta particularmente interesante el estudio del contacto de una superficie metálica con un plasma. Siend...

  20. Integración continua y automatización de procesos de calidad en el desarrollo de aplicaciones JEE

    OpenAIRE

    Abadia Pastor, Marçal

    2011-01-01

    Català: El projecte està centrat en la millora de la qualitat i de l'eficiència en el desenvolupament d'aplicacions web en la plataforma Java JEE mitjançant una metodologia basada en cicles curts de desenvolupament per validar l'aplicació mes contínuament i evitar imprevistos d'última hora. Per portar a terme aqueta metodologia que consisteix en un entorno d?Integració Continua, l'equip de treball per el qual s'ha realitzat el projecte té una experiència important en els repositoris de codi p...

  1. Aplicaciones de normas no cuadráticas en tratamiento digital de la señal

    OpenAIRE

    Páez Borrallo, José Manuel

    1987-01-01

    La mayoría de los problemas de estimación están basados en la minimización de una función de coste cuadrática del error de estimación. Este criterio de calidad posee la propiedad de proporcionar el mejor y más sencillo estimador posible en un gran número de aplicaciones. Sin embalo, existen situaciones concretas donde la selección de funciones de costo más generales ofrecen similares o incluso mejores prestaciones que la minimización cuadrática. El presente trabajo introduce criterios de opti...

  2. Síntesis, caracterización y aplicaciones de partículas CoxNi100-x

    OpenAIRE

    Olvera Vázquez, Seydy Lizbeth

    2014-01-01

    Tesis doctoral inédita cotutelada por el Instituto Politécnico Nacional, (México) y por la Universidad Autónoma de Madrid, Facultad de Ciencias, Departamento de Química Física Aplicada: Fecha de lectura: 08-10-2014 Los materiales nanocristalinos presentan numerosas aplicaciones tecnológicas de acuerdo a sus propiedades, algunas de las más importantes son: magnetismo, dureza, conductividad eléctrica y térmica, y resistencia a la corrosión, entre otras, las cuales se pueden controlar ...

  3. Análisis de eficiencia en arquitecturas multiprocesador para aplicaciones de transmisión y procesamiento de datos

    OpenAIRE

    Osio, Jorge R.; Salvatore, Juan Eduardo; Kunysz, Eduardo; Montezanti, Diego Miguel; Alonso, Daniel; Guarepi, V. L.; Morales, Daniel Martín

    2017-01-01

    Las principales líneas de investigación de este proyecto están orientadas a la utilización de arquitecturas multicore para cómputo paralelo en aplicaciones de Telemedicina, Procesamiento de Imágenes Médicas, robótica y de sistemas ópticos basados en MIOC, (Multifunctional Integrated Optical Chip), que requieren procesamiento y transmisión de datos de forma remota. Paralelamente a estos lineamientos, dentro del marco del proyecto se exploran nuevas tendencias en cómputo paralelo, siendo las...

  4. Estudio sobre el desarrollo de aplicaciones con soporte multimedia en plataformas para móviles basadas en web

    OpenAIRE

    Román López, Verónica

    2014-01-01

    Tal vez podrían preguntarse si un nuevo sistema operativo para móviles tiene sentido en un mundo dominado por Google y Apple. En este Trabajo Fin de Grado se estudiarán los nuevos sistemas operativos que están surgiendo, tales como Firefox OS, Tizen OS, Ubuntu Touch OS, Sailfish OS y WebOS, los cuales han optado por sacar el máximo partido al navegador web a partir de aplicaciones basadas en HTML 5, CSS 3 y JavaScript y, se verá como éstos comienzan a plantar cara a los dos sistem...

  5. Endo-β-1,4-glucanasa para la fabricación de micro/nanocelulosa: propiedades y aplicaciones

    OpenAIRE

    Tarrés Farrés, Joaquim Agustí

    2017-01-01

    En els darrers anys, entre la comunitat científica i tecnològica s’ha despertat un gran interès en la producció, caracterització i utilització de nanofibres de cel·lulosa. Aquesta especial atenció es deu, principalment, al seu caràcter biodegradable, el seu origen renovable i la versatilitat que presenten, fent-les aptes per ser utilitzades en multitud d’aplicacions. L’esclat d’aquesta temàtica de recerca va tenir lloc aproximadament deu anys enrere, doncs només cal observar el creixement exp...

  6. Estudio de películas de CoP y SmCo en sensores miniaturizados para aplicaciones espaciales

    OpenAIRE

    Lucas del Pozo, Irene

    2009-01-01

    Esta tesis doctoral está centrada en el estudio, desarrollo y optimización de dos sensores de campo magnético para aplicaciones espaciales: un sensor de campo magnético tipo fluxgate, pensado principalmente para medidas en órbita del campo magnético, y un sensor de gradiente de campo magnético o gradiómetro con el objetivo de llevar a cabo medidas magnéticas de la superficie de Marte o de la Luna. Inicialmente este último está orientado a ser embarcado en alguna misión dirigida al planeta Mar...

  7. Sobre algunas clases polinomiales de satisfacibilidad : Aplicaciones a la resolución de problemas geométricos

    OpenAIRE

    Jesus Rodrigues, José Inácio de

    2009-01-01

    La Geometría Computacional posee un vasto campo de aplicaciones en las áreas de las Ciencias de Información Geográfica, Electrónica y Computación, entre muchas otras. En estos campos, los problemas de etiquetado de mapas, trazados de circuitos integrados o creación de diagramas de flujos y organigramas son ejemplos particulares de problemas cuyas instancias son en muchos casos reducibles al problema de satisfacibilidad proposicional (SAT). Es decir, su resolución puede ser conseguida a partir...

  8. Documentación y análisis de los principales frameworks de arquitectura de software en aplicaciones empresariales

    OpenAIRE

    Sarasty España, Hugo Fernando

    2016-01-01

    Este documento se enfoca en un tema común hoy en día en el ambiente tecnológico y empresarial, el cual es la arquitectura de software y su aplicabilidad a través de frameworks a proyectos empresariales. Este documento de investigación servirá de base para obtener un conocimiento y entendimiento de los frameworks de arquitectura de software más usados en el desarrollo de aplicaciones empresariales, determinando su aplicabilidad según el proyecto que se esté abordando. Facultad de Informátic...

  9. Enzimas lipoliticas bacterianas: propiedades, clasificación, estructura, aplicaciones tecnológicas y aspectos legales

    OpenAIRE

    Navarro González, Inmaculada; Periago Castón, María Jesús

    2012-01-01

    Las enzimas lipolíticas son biocatalizadores que llevan a cabo reacciones de síntesis, hidrolisis o intercambios de grupos en sustancias oleosas. Las enzimas lipolíticas presentes en la naturaleza han sido utilizadas en la producción de alimentos durante millones de años, pero en las últimas décadas han adquirido una mayor importancia; debido a la multitud de aplicaciones tecnológicas en las que son capaces de actuar y a las ventajas que presentan frente a los catalizadores convencionales ...

  10. Aplicaciones del efecto fotorrefractivo del cristal BSO al procesamiento óptico de imágenes a tiempo real

    OpenAIRE

    Grosz, Susana I.

    1993-01-01

    Presentamos en este trabajo algunas aplicaciones al procesamiento óptico de imágenes usando un cristal fotorrefractivo BSO. Para ello en el capítulo 1 estudiamos las propiedades físicas del cristal BSO, describiendo aspectos generales del mismo, sus propiedades ópticas y la estructura de niveles de energía . En el capítulo 2 se estudia el efecto fotorrefractivo haciendo un análisis del efecto electroóptico tanto en el caso general como en el caso particular del cristal BSO...

  11. Aplicaciones de la energía solar en diferentes procesos agrícolas e industriales

    OpenAIRE

    Agudelo Flórez, Sergio Cipriano; Pineda Ríos, Alexander

    2002-01-01

    Las tecnologías concernientes al aprovechamiento de la energía solar térmica permiten, ahora, ofrecer mucho más que el simple calentamiento de agua para uso doméstico. El presente artículo muestra algunas aplicaciones de sistemas solares que pueden brindar nuevas alternativas en procesos de calentamiento para muchos y variados requerimientos ya sean agrícolas o industriales, por ejemplo para el secado de cosechas; para la potabilización de agua, al destruir contaminantes presentes en ella, y ...

  12. Materiales piezoeléctricos: formas de presentación ventajas y desventajas en las aplicaciones

    OpenAIRE

    Jiménez, B.

    1995-01-01

    El enorme desarrollo que han experimentado las aplicaciones de los materiales piezoeléctricos en las nuevas tecnologías se ha debido, fundamentalmente, al descubrimiento de las propiedades ferroeléctricas en los materiales con estructura tipo perovskita de composiciones basadas en el Titanato de Plomo. La posibilidad de preparar soluciones sólidas en forma cerámica y más recientemente el polímero PVDF y los materiales compuestos por una fase activa piezoeléctrica y otra fase no activa , "comp...

  13. Generación automática de aplicaciones web móviles mediante componentes configurables

    OpenAIRE

    Vera, Pablo Martín; Pons, Claudia; González, Carina; Rodríguez, Rocío Andrea; Giulianelli, Daniel Alberto

    2014-01-01

    Teniendo como objetivo final la generación completa del código fuente de una aplicación, se ha desarrollado CBDHM (Metodología de Modelado Hipermedia Basada en Componentes). Esta metodología está basada en UML (Lenguaje Unificado de Modelado) y permite diseñar y construir aplicaciones web móviles utilizando dos modelos: el modelo de datos y el modelo de interfaz de usuario. El modelo de datos está basado en el diagrama de clases UML extendido para poder generar la base de datos y sus relacion...

  14. Desarrollo y aplicaciones de las tecnologías de radiotrazadores y ESCANEO gamma

    Directory of Open Access Journals (Sweden)

    Mario Conejo

    2008-04-01

    Full Text Available Las tecnologías de radiotrazadores y de escaneo gamma representan herramientas muy consolidadas para el estudio, análisis y evaluación de los procesos industriales. En este trabajo se reportan los resultados del desarrollo de las tecnologías de escaneo gamma y radiotrazadores en algunas aplicaciones de laboratorio y en sistemas de mayor complejidad. La tecnología de radiotrazadores fue empleada para estudiar la difusión de boro durante el proceso de curado de la madera, evaluar una laguna de tratamiento de aguas negras con plantas de lirio acuático y realizar experimentos con variables controladas en un circuito hidráulico de laboratorio (flow-rig. La técnica de escaneo gamma se utilizó para analizar una torre prototipo de nuestros laboratorios. Los principales resultados obtenidos en los experimentos fueron los siguientes: 1 la absorción de boro como agente de curado de la madera, es muy variable según sea la sección de la madera expuesta a la solución de curado; 2 durante las pruebas con radiotrazador Yodo 131 las plantas de lirio acuático de la laguna de tratamiento absorben parte del radiotrazador, lo que dificulta la determinación de los tiempos de residencia; 3 la sensibilidad que se obtiene al emplear un sistema con fuente de Cesio-137 y detector es lo suficientemente alta como para permitir detectar la presencia de materiales de baja absorción de radiación, dentro de columnas con paredes de acero.

  15. Uso de Plataformas para el Desarrollo de Aplicaciones Virtuales en el Modelado de Robot Manipuladores

    Directory of Open Access Journals (Sweden)

    Róger E. Sánchez-Alonso

    2017-07-01

    Full Text Available Resumen: En este trabajo se propone el uso de plataformas para el desarrollo de aplicaciones virtuales como herramientas para el modelado de robots manipuladores. La propuesta se basa en aprovechar el gran potencial que actualmente tienen estas plataformas para solucionar la dinámica de cuerpos rígidos, lo que permite modelar de forma sencilla los aspectos mecánicos del manipulador. Por otro lado, la posibilidad ofrecida por estas plataformas de incorporar código de programación en lenguajes convencionales, permite modelar el comportamiento dinámico de sistemas físicos reales, tales como sensores y actuadores, lo que hace posible la implementación de una etapa virtual de instrumentación y control tal y como se realiza en un robot real. El uso de estas plataformas permite modelar desde cero cualquier robot manipulador. El modelado de un robot paralelo reconfigurable es presentado como caso de estudio. Abstract: This paper describes the use of platforms for the development of virtual applications as tools for modeling of robot manipulators. The proposal is based on take advantage of the potential that these platforms currently have for solving the rigid body dynamics, which easily allows modeling the mechanical aspects of the manipulator. On the other hand, the possibility offered by these platforms of incorporate programming code in conventional languages allows to modeling the dynamic behavior of real physical systems, such as sensors and actuators, which allows implementing the development of the instrumentation and control stage of an industrial robot in the same way as a real one. Using these platforms allows the modeling from the bases of any manipulator robot. The modeling of a reconfigurable parallel robot is presented as a case study. Palabras clave: Modelado, Robots manipuladores, Realidad virtual, Sistemas dinámicos, Keywords: Modeling, Manipulator Robots, Virtual reality, Dynamic systems

  16. Testing como Práctica para Evaluar la Eficiencia en Aplicaciones Web

    Directory of Open Access Journals (Sweden)

    Delvis Echeverría Perez

    2014-10-01

    Full Text Available La investigación está asociada al Testing como práctica para evaluar uno de los atributos de calidad que describe la Norma ISO/IEC 9126 como característica la “Eficiencia”, que es según esta norma: La capacidad del producto de software para proporcionar una ejecución o desempeño apropiado, en relación con la cantidad de recursos utilizados usados, bajo condiciones establecidas. Para evaluar esta característica se han identificado un conjunto de tipos de Test, teniendo en cuenta las sub-características de la misma ellas son: Rendimiento, Carga y Estrés, además se propone un procedimiento que guía la gestión y ejecución de los diferentes test. Para las No Conformidades (errores generados se ha elaborado una clasificación dependiendo de su tipo. Se propone el uso de herramientas automatizadas para la ejecución de los diferentes test, específicamente la herramienta JMETER, usada para analizar y medir el desempeño de una variedad de servicios, con énfasis en aplicaciones web. Se creó una Base de Casos de posibles soluciones que dan respuesta a errores HTTP. Todos estos elementos descritos anteriormente proveen de un marco para la evaluación final de la característica en cuestión en productos de software, proponiéndose un conjunto de métricas que arrojan resultados cuantitativos por cada sub-característica de la Norma o por tipos de test propuestos.

  17. Fusión Borrosa de Estimadores para Aplicaciones de Control Basado en Imagen

    Directory of Open Access Journals (Sweden)

    Carlos Perez-Vidal

    2010-04-01

    Full Text Available Resumen: El control visual es una disciplina de gran actualidad dentro del control de robots, y dentro de ésta, los algoritmos de predicción se usan para estimar la localización de objetos o características visuales proporcionadas por un sensor con retardo (cámara. Algunos de los algoritmos más utilizados son: el filtro de Kalman; los filtros alpha-beta/gamma (αβ/γ; el AKF; el SKF; etc. El mayor problema de algunos de ellos es conseguir que su implementación permita trabajar en aplicaciones con fuertes restricciones temporales o de tiempo real. En este artículo se presenta un nuevo método de predicción, denominado FMF, basado en la fusión o combinación borrosa de varios filtros, y por tanto con un alto coste computacional. En el artículo se estudia a través de simulación la mejora obtenida con la predicción del FMF respecto a los filtros individuales, lo que justifica su interés. Así mismo, se desarrolla su implementación de tiempo real en una FPGA empleando técnicas de paralelización y segmentado. La viabilidad, robustez y fiabilidad del algoritmo propuesto se ha comprobado mediante una aplicación experimental de control visual. Palabras clave: Métodos predictivos, algoritmos paralelos, sistemas fuzzy, visión por computador, control automático

  18. Using smart card technology to monitor the eating habits of children in a school cafeteria: 3. The nutritional significance of beverage and dessert choices.

    Science.gov (United States)

    Lambert, N; Plumb, J; Looise, B; Johnson, I T; Harvey, I; Wheeler, C; Robinson, M; Rolfe, P

    2005-08-01

    The consumption patterns of beverages and desserts features highly in the current debate surrounding children's nutrition. The aim of this study was to continuously monitor the choice of beverages and desserts made by nearly 1000 children in a school cafeteria. A newly developed smart card system was used to monitor the food choices of diners (7-16-year-old boys) in a school cafeteria over 89 days. A wide variety of beverages and desserts were on offer daily. Despite coming from an affluent, well-educated demographic group, the boys' choices of beverages and desserts mirrored those of children in general. Buns and cookies were over 10 times more popular than fresh fruits and yogurts. Sugary soft-drinks were over 20 times more popular than fresh fruit drinks and milk combined. Appropriate choices could, over a month, reduce intake of added sugar by over 800 g and fat by over 200 g. The smart card system was very effective at monitoring total product choices for nearly 1000 diners. In agreement with a recent national school meal survey, where choice is extensive, children show a preference for products high in fat and/or sugar. The consequences of these preferences are discussed.

  19. Integrating two-photon microscopy and cryo-electron microscopy for studying the interaction of Cafeteria roenbergensis and CroV

    Science.gov (United States)

    Aghvami, Seyedmohammadali

    Cafeteria roenbergensis (Cro) is a marine zooplankton; its voracious appetite plays a significant role in regulating bacteria populations. The giant virus that lives within Cro, known as Cafeteria roenbergensis virus (CroV), has an important effect on the mortality of Cro populations. Although viral infections are extremely abundant in oceans, the complete procedure of the infection is still unknown. We study the infection process of Cro by CroV to find out whether the initial contact is through phagocytosis or CroV penetrating the host cell membrane directly. Cro is a moving at speed in the range of 10-100 um/s, therefore, there are many difficulties and challenges for traditional imaging techniques to study this viral-host interaction. We apply two-photon fluorescence microscopy to image this infection process. The image is taken at video rate (30 frame/s), which makes us able to catch the moment of interaction. We are able to image host and virus simultaneously where CroV is stained by SYBR gold dye and Cro is excited through NADH autofluorescence. For further structural biology study, we will obtain atomic level resolution information of infection. After catching the initial moment of infection, we will freeze the sample instantly and image it with cryo-electron microscope .

  20. Effect of Nutritional Intervention on Food Choices of French Students in Middle School Cafeterias, Using an Interactive Educational Software Program (Nutri-Advice).

    Science.gov (United States)

    Turnin, Marie-Christine; Buisson, Jean-Christophe; Ahluwalia, Namanjeet; Cazals, Laurent; Bolzonella-Pene, Caroline; Fouquet-Martineau, Caroline; Martini, Pascale; Tauber, Maïthé; Hanaire, Hélène

    2016-02-01

    To evaluate the impact of interactive Nutri-Advice kiosks on children's nutritional skills and their ability to apply it to food choices in a middle school cafeteria menu (food choice competencies). Quasi-experimental design; pre/post-test. Freestanding interactive computer terminals (kiosks) were installed in three middle schools in Toulouse, France. A total of 580 children were enrolled into the study (mean age, 13 ± 1 years). Each child's physiological profile was stored in a personal barcode card. During 1 school year, once a day, each child could access the kiosk with this card, trying to find the most balanced meal according to his or her profile and the food available on the cafeteria menu. Children's food choice competency changes and body mass index z-score were evaluated. Significance of change in food choice competencies (postintervention vs baseline) was examined using paired t test. Across the study, children chose significantly less cheese and pastry or desserts, and significantly more starchy food and dairy, and tended to choose fruits and vegetables more often. Body mass index z-score decreased significantly during the period. Personalized nutrition counseling through an interactive device has the potential to improve the food choice competencies of children. Copyright © 2016 Society for Nutrition Education and Behavior. Published by Elsevier Inc. All rights reserved.

  1. Cafeteria diet induces obesity and insulin resistance associated with oxidative stress but not with inflammation: improvement by dietary supplementation with a melon superoxide dismutase.

    Science.gov (United States)

    Carillon, Julie; Romain, Cindy; Bardy, Guillaume; Fouret, Gilles; Feillet-Coudray, Christine; Gaillet, Sylvie; Lacan, Dominique; Cristol, Jean-Paul; Rouanet, Jean-Max

    2013-12-01

    Oxidative stress is involved in obesity. However, dietary antioxidants could prevent oxidative stress-induced damage. We have previously shown the preventive effects of a melon superoxide dismutase (SODB) on oxidative stress. However, the mechanism of action of SODB is still unknown. Here, we evaluated the effects of a 1-month curative supplementation with SODB on the liver of obese hamsters. Golden Syrian hamsters received either a standard diet or a cafeteria diet composed of high-fat, high-sugar, and high-salt supermarket products, for 15 weeks. This diet resulted in insulin resistance and in increased oxidative stress in the liver. However, inflammatory markers (IL-6, TNF-α, and NF-κB) were not enhanced and no liver steatosis was detected, although these are usually described in obesity-induced insulin resistance models. After the 1-month supplementation with SODB, body weight and insulin resistance induced by the cafeteria diet were reduced and hepatic oxidative stress was corrected. This could be due to the increased expression of the liver antioxidant defense proteins (manganese and copper/zinc superoxide dismutase, catalase, and glutathione peroxidase). Even though no inflammation was detected in the obese hamsters, inflammatory markers were decreased after SODB supplementation, probably through the reduction of oxidative stress. These findings suggest for the first time that SODB could exert its antioxidant properties by inducing the endogenous antioxidant defense. The mechanisms underlying this induction need to be further investigated. Copyright © 2013 Elsevier Inc. All rights reserved.

  2. Lack of tissue accumulation of grape seed flavanols after daily long-term administration in healthy and cafeteria-diet obese rats.

    Science.gov (United States)

    Margalef, Maria; Pons, Zara; Iglesias-Carres, Lisard; Bravo, Francisca Isabel; Muguerza, Begoña; Arola-Arnal, Anna

    2015-11-18

    After ingestion flavanols are metabolized by phase-II enzymes and the microbiota and are distributed throughout the body depending on several factors. Herein we aim to evaluate whether flavanols are tissue-accumulated after the long-term administration of a grape seed polyphenol extract (GSPE) in rats and to study if compounds present in tissues differ in a cafeteria-diet obesity state. For that, plasma, liver, mesenteric white adipose tissue (MWAT), brain, and aorta flavanol metabolites from standard chow-diet-fed (ST) and cafeteria-diet-fed (CAF) rats were analyzed by high-performance liquid chromatography electrospray ionization tandem mass spectrometry (HPLC-ESI-MS/MS) 21 h after the last 12-week-daily GSPE (100 mg/kg) dosage. Results showed that long-term GSPE intake did not trigger a flavanol tissue accumulation, indicating a clearance of products at each daily dosage. Therefore, results suggest that polyphenol benefits in a disease state would be due to a daily pulsatile effect. Moreover, obesity induced by diet also influences the metabolism and bioavailability of flavanols in rats.

  3. Effects of Supplemental Acerola Juice on the Mineral Concentrations in Liver and Kidney Tissue Samples of Mice Fed with Cafeteria Diet.

    Science.gov (United States)

    Leffa, Daniela Dimer; dos Santos, Carla Eliete Iochims; Daumann, Francine; Longaretti, Luiza Martins; Amaral, Livio; Dias, Johnny Ferraz; da Silva, Juliana; Andrade, Vanessa Moraes

    2015-09-01

    We evaluated the impact of a supplemental acerola juice (unripe, ripe, and industrial) and its main pharmaceutically active components on the concentrations of minerals in the liver and kidney of mice fed with cafeteria diet. Swiss male mice were fed with a cafeteria (CAF) diet for 13 weeks. The CAF consisted of a variety of supermarket products with high energy content. Subsequently, animals received one of the following food supplements for 1 month: water, unripe acerola juice, ripe acerola juice, industrial acerola juice, vitamin C, or rutin. Mineral concentrations of the tissues were determined by particle-induced X-ray emission (PIXE). Our study suggests that the simultaneous intake of acerola juices, vitamin C, or rutin in association with a hypercaloric and hyperlipidic diet provides change in the mineral composition of organisms in the conditions of this study, which plays an important role in the antioxidant defenses of the body. This may help to reduce the metabolism of the fat tissue or even to reduce the oxidative stress.

  4. Promotions to increase lower-fat food choices among students in secondary schools: description and outcomes of TACOS (Trying Alternative Cafeteria Options in Schools).

    Science.gov (United States)

    Fulkerson, Jayne A; French, Simone A; Story, Mary; Nelson, Helen; Hannan, Peter J

    2004-08-01

    (1) To describe promotional activities, particularly student-led, targeting lower-fat à la carte foods that were conducted in secondary schools; and (2) to describe the relationships between the number and duration of total promotional activities for lower-fat à la carte foods and cafeteria sales of such foods over two years. Promotional activities were implemented in schools that were randomised to the intervention condition of a larger, two-year, school-based, randomised, controlled nutrition intervention trial. Ten Minnesota secondary schools. Students and school faculty, school food-service and research staff (measured at the school level). Over two years, 181 promotions were implemented (n=49 in Year 1 and n=132 in Year 2). In Year 1, the number of promotions conducted in schools was significantly associated with percentage lower-fat food sales. In Year 2, the duration of promotions was significantly associated with percentage lower-fat food sales. Collaborative efforts among students, school food-service staff and research staff can be successful in implementing a large number of nutrition-related, school-wide promotional activities. These efforts can increase the sales of lower-fat foods in à la carte areas of school cafeterias.

  5. Tecnología Móvil: desarrollo de sistemas y aplicaciones para las Unidades de Información

    Directory of Open Access Journals (Sweden)

    Raúl Alberto Garita-Araya

    2013-07-01

    Full Text Available Las Unidades de Información han enfrentado cambios con el pasar de los años, lograron adaptarse, crecer y en la mayoría de los casos evolucionar. Algunas mejoran sus servicios, productos y llegan a una mayor cantidad y calidad de usuarios. Sin embargo, esta evolución no ha sido igual para todas, muchas se han quedado en el camino. La evolución ha sido provocada principalmente por los avances en la tecnología; los sistemas rígidos de administración y descripción bibliográfica deberían ser historia. En la actualidad, los sistemas son en ambiente web y permiten utilizar las herramientas, el almacenaje y acceso en la nube. Es necesario que las bibliotecas exploten las oportunidades que las tecnologías, herramientas y plataformas móviles proporcionan; accesos ilimitados, mayor captura de usuarios según sus intereses individuales o grupales. Las aplicaciones móviles son un mercado que las bibliotecas deben aprovechar, su desarrollo debe dejar de ser un obstáculo para los profesionales de la información. En el momento que las unidades de información desarrollen y personalicen sus propias herramientas y aplicaciones web, la brecha informacional de sus usuarios gradualmente desaparecerá, un desafío que vale la pena el esfuerzo.

  6. Tecnología Móvil: desarrollo de sistemas y aplicaciones para las Unidades de Información

    Directory of Open Access Journals (Sweden)

    Raúl Alberto Garita-Araya

    2013-01-01

    Full Text Available Las Unidades de Información han enfrentado cambios con el pasar de los años, lograron adaptarse, crecer y en la mayoría de los casos evolucionar. Algunas mejoran sus servicios, productos y llegan a una mayor cantidad y calidad de usuarios. Sin embargo, esta evolución no ha sido igual para todas, muchas se han quedado en el camino. La evolución ha sido provocada principalmente por los avances en la tecnología; los sistemas rígidos de administración y descripción bibliográfica deberían ser historia. En la actualidad, los sistemas son en ambiente web y permiten utilizar las herramientas, el almacenaje y acceso en la nube. Es necesario que las bibliotecas exploten las oportunidades que las tecnologías, herramientas y plataformas móviles proporcionan; accesos ilimitados, mayor captura de usuarios según sus intereses individuales o grupales. Las aplicaciones móviles son un mercado que las bibliotecas deben aprovechar, su desarrollo debe dejar de ser un obstáculo para los profesionales de la información. En el momento en que las unidades de información desarrollen y personalicen sus propias herramientas y aplicaciones web, la brecha informacional de sus usuarios gradualmente desaparecerá, un desafío que vale la pena el esfuerzo.

  7. Substation automation. Integration of applications of the SICLE; Automatizacion de subestaciones. Integracion de aplicaciones sobre el SICLE

    Energy Technology Data Exchange (ETDEWEB)

    Gutierrez, Gustavo; Vega, Miguel [Instituto de Investigaciones Electricas, Cuernavaca (Mexico)

    1997-12-31

    This paper presents the first applications developed by the Instituto de Investigaciones Electricas (IIE) on the infrastructure of the SICLE (Sistema de Informacion y Control Local de la Estacion) (Station Information and Local Control System), that Comision Federal de Electricidad (CFE) is now acquiring in order to automate its transmission substations. A computer infrastructure was obtained similar to the existing in the substation for the development of program testing at the IIE; the personnel of the same was trained; the applications in conjunction with the CFE specialists were defined; the agreed developments were made and installed at the Temascal II Substation. [Espanol] En el presente articulo se presentan las primeras aplicaciones desarrolladas por el Instituto de Investigaciones Electricas (IIE) sobre la infraestructura del SICLE (Sistema de Informacion y Control Local de Estacion) que esta adquiriendo la Comision Federal de Electricidad (CFE) a fin de automatizar sus subestaciones de transmision. Se obtuvo una infraestructura de computo similar a la existente en la subestacion para el desarrollo de prueba de programas en el IIE; se capacito al personal en la misma; se definieron las aplicaciones conjuntamente con los especialistas de la CFE; se hicieron los desarrollos acordados y se instalaron en la subestacion Temascal II.

  8. A Holistic Approach to Healthy School Meals: "How Hopkins High School Looked Beyond its Cafeteria when it Changed Meal Service from Fast Food to Nutritional Food. IssueTrak": A CEFPI Brief on Educational Facility Issues

    Science.gov (United States)

    Dufault, Timothy; Parsons, Meg

    2006-01-01

    The new cafeteria at Hopkins High School in Minnetonka, Minnesota is part restaurant, part study hall, part lounge area and part health-food store. From the beginning, the superintendent and food service leaders planned the facility to ensure that balanced diets with quickly prepared, but healthy, foods are offered to students to help them…

  9. Chronic administration of grape-seed polyphenols attenuates the development of hypertension and improves other cardiometabolic risk factors associated with the metabolic syndrome in cafeteria diet-fed rats

    NARCIS (Netherlands)

    Pons, Z.; Margalef, M.; Bravo, F.I.; Arola-Arnal, A.; Muguerza, B.

    2017-01-01

    The effects of grape-seed polyphenols against the development of hypertension and other cardiometabolic conditions associated with the metabolic syndrome (MetS) were studied in rats fed a high-fat, high-carbohydrate diet, known as the cafeteria (CAF) diet. Two groups of Wistar rats were fed standard

  10. Development of a Web application for a real time information system; Desarrollo de una aplicacion web para un sistema de informacion en tiempo real

    Energy Technology Data Exchange (ETDEWEB)

    Espinosa R, Alfredo; Silva F, Brisa M; Quintero R, Agustin [Instituto de Investigaciones Electricas, Cuernavaca, Morelos (Mexico)

    2007-07-01

    In this article its is described a technique for the development of a Web application for a real time information system that allows the remote and concurrent connection of different equipment to the network historical data base of the system, without the need of the installation of any software component in the remote equipment of the user who makes the consultation. It defines and establishes the software architecture that allows the development of the Web application, the analysis stages, the operation of the technology to be used, as well as the design, development and implementation of the application. Finally, the accomplishments obtained with the development of the Web application for a real time information system are described. [Spanish] En este articulo se describe una tecnica para el desarrollo de una aplicacion web para un sistema de informacion en tiempo real, que permita la conexion remota y concurrente de diferentes equipos en la red a la base de datos historica del sistema, sin necesidad de que se instale ningun componente de software en el equipo remoto del usuario que realiza la consulta. Se define y establece la arquitectura de software que permite el desarrollo de la aplicacion web, las etapas de analisis, el funcionamiento de la tecnologia a utilizar, asi como el diseno, desarrollo e implementacion de la aplicacion. Finalmente, se describen los logros obtenidos con el desarrollo de la aplicacion web para un sistema de informacion en tiempo real.

  11. Analisis de los Servicios y Aplicaciones LBS. Desarrollo de una plataforma de apoyo para la gestión de procesos y localización de personas

    OpenAIRE

    IRIMIA CERVERA, JAVIER

    2015-01-01

    Irimia Cervera, J. (2015). Analisis de los Servicios y Aplicaciones LBS. Desarrollo de una plataforma de apoyo para la gestión de procesos y localización de personas [Tesis doctoral no publicada]. Universitat Politècnica de València. doi:10.4995/Thesis/10251/48879. TESIS

  12. Framework Orientado a Aspectos de Recopilación Automática de Datos para la Evolución de Usabilidad en Aplicaciones Web

    Directory of Open Access Journals (Sweden)

    Roberto Farias

    2016-08-01

    Full Text Available La Usabilidad consiste de un conjunto de atributos que permiten evaluar el esfuerzo que deberá invertir un usuario para realizar una tarea determinada a través de la utilización de un software específico. En este sentido, una aplicación se considerará más usable cuanto menos esfuerzo requiera para su utilización. En la actualidad, la World Wide Web, se ha constituido como un enorme repositorio de información que es presentada y puesta a disposición de los usuarios a través de diversos sitios o páginas web cuya finalidad es promover el acceso a la información y de esta manera,  garantizar la igualdad de oportunidades a quienes la consumen. Por otro lado, la evolución de las tecnologías que le dan soporte, la han convertido en una plataforma tecnológica sobre la cual es posible desarrollar aplicaciones con un nivel de interacción y funcionalidad similar al de las aplicaciones de escritorio (WIMP. Existen una gran variedad de trabajos sobre usabilidad web, centrados principalmente en aspectos tales como la navegación y la arquitectura de información de los sitios o páginas web. Sin embargo, la usabilidad de las aplicaciones web, que experimentan un alto grado de interacción con el usuario (action-oriented similar al de las aplicaciones de escritorio, no puede ser evaluadas de la misma manera que en un sitio web (information-oriented donde la interacción con el usuario es escasa y limitada. Si bien pueden encontrarse una diversidad de trabajos que tratan como objeto de estudio a la usabilidad en aplicaciones, en entornos de escritorio ó moviles, no se han reconocido trabajos referidos a la usabilidad de aplicaciones en entornos web. En este trabajo, se propone un framework basado en AOP, capaz de dar soporte al proceso de evaluación de usabilidad, en aplicaciones web, durante la ejecución de tareas de usuario.

  13. Sulfato de calcio: propiedades y aplicaciones clínicas Calcium sulfate: properties and clinical applications

    Directory of Open Access Journals (Sweden)

    J López

    2011-12-01

    Full Text Available Durante más de cien años el sulfato de calcio se ha distinguido de otros biomateriales, por ser uno de los materiales aloplásticos más simples y que presenta la más larga historia clínica como material sintético. Entre sus principales propiedades destacan que es de fácil obtención, capacidad de osteoconducción, es totalmente absorbible, no provoca reacciones de inflamación o antigénicas, fácil modelado y fuerza de compresión semejante al tejido óseo. Todas éstas características son necesarias para ser usado como sustituto óseo. Sin embargo, diferencias en la morfología y estructura de sus cristales, la porosidad, propiedades mecánicas y en la constitución química del sulfato de calcio puede alterar significativamente sus propiedades biológicas. El objetivo de la presente revisión es conocer las propiedades del sulfato de calcio y sus diferentes aplicaciones clínicas como sustituto óseo en procedimientos regenerativos.For over 100 years, the calcium sulfate has stood out from other biomaterials, for being one of the simplest alloplastic materials and having the longest history as synthetic material. It is readily available, has osteoconductive properties, is completely absorbed, does not cause inflammation or antigenic reactions, can be modeled to defect, has compressive strength similar to bone tissue and can be used as a vehicle for in situ release of chemotherapeutic agents. All these features are required to be used as a bone substitute. However, differences in morphology, crystal structure, porosity, mechanical properties and chemical constitution of calcium sulfate can significantly alter its biological properties. The aim of this study was to determine through a review of the literature, the properties of calcium sulfate and its various clinical applications as bone substitute in regenerative procedures.

  14. Materiales en lámina delgada sobre sustratos cerámicos para aplicaciones fotovoltaicas

    Directory of Open Access Journals (Sweden)

    Guillén, C.

    2005-02-01

    Full Text Available Various ceramic supports besides standard soda-lime glass have been utilized as substrates for deposition of molybdenum and copper indium diselenide layers (substrate/Mo/CuInSe2 heterostructures for application in thin film photovoltaic solar cells. Molybdenum layers have been prepared simultaneously onto the different substrates by electron gun assisted evaporation. Subsequently, CuInSe2 thin films have been obtained by direct electrodeposition onto the Mo-coated substrates. The influence of the substrate characteristics onto the optical and structural properties of the developed materials has been determined to evaluate the possibility of substituting the commonly utilized glass by ceramics that can wide the applications of these photovoltaic systems. The obtained results indicate that the scattering factor and the structural stress in the layers are minimized when the morphological characteristics of the ceramic are close to those of the standard glass substrates.

    Se han probado distintos tipos de soportes cerámicos y vidrio sodocálcico convencional como sustratos sobre los que se han depositado películas de molibdeno y seleniuro de cobre e indio (heteroestructuras de la forma sustrato/Mo/CuInSe2 para su aplicación en células solares fotovoltaicas de lámina delgada. Las películas de Mo se han preparado simultáneamente sobre los distintos sustratos mediante evaporación asistida por cañón de electrones. A continuación, las láminas delgadas de CuInSe2 se han obtenido mediante electrodepósito directo sobre los sustratos cubiertos con Mo. Se ha determinado la influencia del tipo de sustrato empleado sobre las propiedades ópticas y estructurales de los materiales preparados, con objeto de evaluar las posibilidades de sustitución del soporte de vidrio usualmente utilizado por materiales cerámicos que permitan diversificar las aplicaciones fotovoltaicas de este tipo de sistemas. Los resultados obtenidos indican que el factor

  15. Propiedades y aplicaciones de los cementos alcalinos Properties and uses of alkali cements

    Directory of Open Access Journals (Sweden)

    Ana Fernández-Jiménez

    2009-12-01

    Full Text Available En este trabajo se presentan algunas de las propiedades tecnológicas de los materiales cementantes elaborados por activación alcalina de aluminosilicatos. Más específicamente sobre las propiedades de morteros y hormigones elaborados con cenizas volantes activadas alcalinamente (sin cemento Portland. Así en función del tipo de activador alcalino empleado y tras un curado térmico previo, el material resultante presentará una interesante lista de propiedades y características que incluyen: elevadas resistencias mecánicas iniciales (a flexión y a compresión, baja retracción al secado, y una muy buena adherencia matriz-acero, así como una excelente resistencia al ataque ácido y un excelente comportamiento frente al fuego. Es por ello que estos nuevos cementos debido a sus magnificas características tecnológicas y durables, así como a la facilidad de adecuarlos a las instalaciones existentes en la industria de los prefabricados, pueden ser fácilmente utilizados en diversas aplicaciones como por ejemplo: elaboración de durmientes para el ferrocarril, bloques para edificación o pavimentación, etc.In this paper are presented some of the technologic properties of cementitious material elaborated by alkali activation of aluminosilicates are presented. More specifically it is about the properties of alkali activated fly ash concrete and mortar (without Portland cement. So depending on the type of alkali activator that is used and after a previous thermal curing, the resulting material will show an interesting list of properties and features that includes: high initial mechanical strengths (under flexure and compression, low drying shrinkage, and a very good matrix-steel bonding, as well as an excellent strength to acid attack and an excellent behaviour when is exposed to fire. That is the reason why these new cements, due to their magnificent and durable technologic features as well as its easy adaptability to the existing

  16. Sunkist. Edificio Central – (EE. UU.

    Directory of Open Access Journals (Sweden)

    Albert C. Martin, Asociados

    1972-04-01

    Full Text Available Sunkist central building – (U.S.A. Architects: Albert C. Martin and Associates It consists of three floors: — the ground floor includes an auditorium, kitchen and cafeteria, a private diningroom, office area, etc.; — on the first floor are the sales department and the electronic data processing department, and — on the second floor, the firm's executive personnel department, and three kitchens for experimenting with products and developing formulas. This building was planned with the idea of reviving, by the design and the materials used, the memory and character of Old California.Consta de tres plantas: — la baja comprende: un auditorio, cocina y cafetería; un comedor privado, una zona dedicada a oficinas, etc.; — la segunda planta contiene: los departamentos de ventas y de proceso electrónico de datos, y — en la tercera planta se distribuyen: el departamento de personal ejecutivo de la empresa; y tres cocinas para la experimentación de productos y de fórmulas a desarrollar. El edificio fue proyectado pensando en que, por sus materiales y diseño, suscitase el recuerdo y el carácter de la antigua California.

  17. Acerola (Malpighia emarginata DC.) juice intake protects against alterations to proteins involved in inflammatory and lipolysis pathways in the adipose tissue of obese mice fed a cafeteria diet.

    Science.gov (United States)

    Dias, Fernando Milanez; Leffa, Daniela Dimer; Daumann, Francine; Marques, Schérolin de Oliveira; Luciano, Thais F; Possato, Jonathan Correa; de Santana, Aline Alves; Neves, Rodrigo Xavier; Rosa, José Cesar; Oyama, Lila Missae; Rodrigues, Bruno; de Andrade, Vanessa Moraes; de Souza, Cláudio Teodoro; de Lira, Fabio Santos

    2014-02-04

    Obesity has been studied as a metabolic and an inflammatory disease and is characterized by increases in the production of pro-inflammatory adipokines in the adipose tissue.To elucidate the effects of natural dietary components on the inflammatory and metabolic consequences of obesity, we examined the effects of unripe, ripe and industrial acerola juice (Malpighia emarginata DC.) on the relevant inflammatory and lipolysis proteins in the adipose tissue of mice with cafeteria diet-induced obesity. Two groups of male Swiss mice were fed on a standard diet (STA) or a cafeteria diet (CAF) for 13 weeks. Afterwards, the CAF-fed animals were divided into five subgroups, each of which received a different supplement for one further month (water, unripe acerola juice, ripe acerola juice, industrial acerola juice, or vitamin C) by gavage. Enzyme-linked immunosorbent assays, Western blotting, a colorimetric method and histology were utilized to assess the observed data. The CAF water (control obese) group showed a significant increase in their adiposity indices and triacylglycerol levels, in addition to a reduced IL-10/TNF-α ratio in the adipose tissue, compared with the control lean group. In contrast, acerola juice and Vitamin C intake ameliorated the weight gain, reducing the TAG levels and increasing the IL-10/TNF-α ratio in adipose tissue. In addition, acerola juice intake led to reductions both in the level of phosphorylated JNK and to increases in the phosphorylation of IκBα and HSLser660 in adipose tissue. Taken together, these results suggest that acerola juice reduces low-grade inflammation and ameliorates obesity-associated defects in the lipolytic processes.

  18. Liraglutide suppression of caloric intake competes with the intake-promoting effects of a palatable cafeteria diet, but does not impact food or macronutrient selection.

    Science.gov (United States)

    Hyde, Kellie M; Blonde, Ginger D; le Roux, Carel W; Spector, Alan C

    2017-08-01

    Liraglutide, a Glucagon-Like Peptide-1 (GLP-1) receptor agonist, is used as a treatment for Type 2 diabetes mellitus and obesity because it improves glycemia and decreases food intake. Here, we tested whether chronic activation of the GLP-1 receptor system with liraglutide would induce decreases in intake accompanied by changes in proportional food or macronutrient intake similar to those seen following RYGB in rats when a variety of palatable food options are available. A "cafeteria diet" was used that included: laboratory rodent chow, refried beans (low-fat/low-sugar), low-fat yogurt (low-fat/high-sugar), peanut butter (high-fat/low-sugar) and sugar-fat whip (high-fat/high-sugar). Liraglutide (1mg/kg daily, sc, n=6) induced significant reductions in body weight and total caloric intake compared to saline-injected control rats (n=6). Although access to a cafeteria diet induced increases in caloric intake in both groups relative to chow alone, liraglutide still effectively decreased intake compared with saline-injected rats suggesting that chronic GLP-1 activation competes with the energy density and palatability of available food options in modulating ingestive behavior. Even with the substantial effects on overall intake, liraglutide did not change food choice or relative macronutrient intake when compared to pre-treatment baseline. When drug treatment was discontinued, the liraglutide group increased caloric intake and rapidly gained body weight to match that of the saline group. These results demonstrate that, while liraglutide effectively decreases caloric intake and body weight in rats, it does not cause adjustments in relative macronutrient consumption. Our data also show that drug-induced decreases in intake and body weight are not maintained following termination of treatment. Copyright © 2017 Elsevier Inc. All rights reserved.

  19. Effect of Sex and Prior Exposure to a Cafeteria Diet on the Distribution of Sex Hormones between Plasma and Blood Cells

    Science.gov (United States)

    Romero, María del Mar; Fernández-López, José Antonio; Remesar, Xavier; Alemany, Marià

    2012-01-01

    It is generally assumed that steroid hormones are carried in the blood free and/or bound to plasma proteins. We investigated whether blood cells were also able to bind/carry sex-related hormones: estrone, estradiol, DHEA and testosterone. Wistar male and female rats were fed a cafeteria diet for 30 days, which induced overweight. The rats were fed the standard rat diet for 15 additional days to minimize the immediate effects of excess ingested energy. Controls were always kept on standard diet. After the rats were killed, their blood was used for 1) measuring plasma hormone levels, 2) determining the binding of labeled hormones to washed red blood cells (RBC), 3) incubating whole blood with labeled hormones and determining the distribution of label between plasma and packed cells, discounting the trapped plasma volume, 4) determining free plasma hormone using labeled hormones, both through membrane ultrafiltration and dextran-charcoal removal. The results were computed individually for each rat. Cells retained up to 32% estrone, and down to 10% of testosterone, with marked differences due to sex and diet (the latter only for estrogens, not for DHEA and testosterone). Sex and diet also affected the concentrations of all hormones, with no significant diet effects for estradiol and DHEA, but with considerable interaction between both factors. Binding to RBC was non-specific for all hormones. Estrogen distribution in plasma compartments was affected by sex and diet. In conclusion: a) there is a large non-specific RBC-carried compartment for estrone, estradiol, DHEA and testosterone deeply affected by sex; b) Prior exposure to a cafeteria (hyperlipidic) diet induced hormone distribution changes, affected by sex, which hint at sex-related structural differences in RBC membranes; c) We postulate that the RBC compartment may contribute to maintain free (i.e., fully active) sex hormone levels in a way similar to plasma proteins non-specific binding. PMID:22479617

  20. Inflamação renal, alterações metabólicas e oxidativas após 6 semanas de dieta de cafeteria em ratos

    Directory of Open Access Journals (Sweden)

    Maria Eugênia Lopes Navarro

    2016-03-01

    Full Text Available Resumo Introdução: A obesidade é uma doença em que a inflamação está inteiramente envolvida e pode causar insuficiência renal. Objetivo: Avaliar a influência da exposição a curto prazo de uma dieta de cafeteria sobre a inflamação no tecido renal e a formação de produtos de glicação avançada (AGEs no plasma de rato. Métodos: Ratos Wistar machos (10 semanas de idade, pesando 350 g foram designados para receber dieta de ração comercial (C; n = 8 animais/grupo, 5% de energia a partir de gordura ou dieta de cafeteria (CAF-D, n = 8 animais/grupo: 29% de energia de gordura e de sacarose em água (300 g/L de beber durante 6 semanas. Resultados: Índice de adiposidade em seis semanas foi maior no grupo CAF-D em comparação com C. O mesmo comportamento foi observado para os níveis plasmáticos de glicose, triglicerídeos, leptina, insulina e AGEs. A expressão do gene de IL-6 e TNF-α em tecido renal foi maior no grupo D-CAF e nenhuma diferença significativa no tecido adiposo. Não houve aumento destas citocinas no plasma ou rim. Houve uma diminuição significativa de adiponectina no grupo CAF-D. Conclusão: A exposição a curto prazo da CAF-D reflete alterações no metabolismo, aumento dos níveis plasmáticos de AGEs, o que pode refletir o aumento expressão de citocinas inflamatórias no rim.

  1. Aplicaciones de sintaxis espacial en Arqueología: una revisión de algunas tendencias actuales

    Directory of Open Access Journals (Sweden)

    Bermejo Tirado, Jesús

    2015-12-01

    Full Text Available This paper reviews some current trends on the application of Space Syntax methodologies for the analysis of Archaeological built environments. It has been divided into different thematic points to approach the explanation of related publications and authors in a more comprehensible way. The study of all these works allows establishing the first synthesis on this issue in the current archaeological bibliography. Finally, I propose a serie of application trends that must be faced in the general framework of current debates on the City as one of the main problems in the XXI century.Este trabajo realiza un recorrido por algunas de las principales tendencias teóricas y metodológicas sobre la aplicación de técnicas de análisis sintáctico-espacial para el estudio de edificios y asentamientos arqueológicos. Hemos divido nuestra exposición en una serie de claves temáticas que sirven para agrupar los trabajos y autores comentados. Nuestro análisis nos permite obtener, por primera vez, una síntesis comprensiva sobre la orientación actual de este tipo de aplicaciones en el ámbito de la Arqueología actual. Para concluir nuestro trabajo planteamos una serie de propuestas de futuro que creemos que contribuirán a asentar este tipo de aplicaciones arqueológicas como un elemento destacado en los debates en torno a la ciudad como uno de los problemas fundamentales del ser humano en el siglo XXI.

  2. Desarrollo de material didáctico multimedia del cultivo de tejidos vegetales con aplicaciones agrarias y ambientales

    Directory of Open Access Journals (Sweden)

    Oscar Agudelo Varela

    2017-09-01

    Full Text Available Las aplicaciones pedagógicas tradicionales se fundamentan en el desarrollo de la clase con marcador y tablero, y con leves avances en el manejo de diapositivas; sin embargo, las tecnologías digitales presentan una serie de novedades que complementan el trabajo de la enseñanza con aprendizaje autónomo, que puede desarrollar el educando en áreas agrarias y ambientales. El desarrollo de material didáctico multimedia MDM complementa las actividades curriculares de los cursos, particularmente, los que tienen laboratorio, y por otro lado, generan en el estudiante habilidades para el aprendizaje autónomo. Se desarrolló un MDM para el aprendizaje de las prácticas realizadas en el laboratorio de cultivos vegetales, con arquitectura cliente/ servidor, usando tecnologías actuales en el desarrollo de software, con características de tiempo real y bajo el paradigma de desarrollo de aplicaciones isomórficas. Con base al MDM, se realizó evaluación cualitativa por parte de estudiantes de Licenciatura en Producción Agropecuaria, la cual reporto un 86% de aprobación del material. Se encontró que las herramientas digitales para el aprendizaje, facilitan y mejoran en cierta medida el aprendizaje de los educandos. El uso de tecnologías nuevas como React, permite mejorar el renderizado de las páginas y optimiza la carga del servidor en las peticiones necesarias por parte del aprendiz, y hace más eficiente el engranaje de enseñanza-aprendizaje. De esta manera, el MDM permitirá fundamentar el desarrollo de habilidades y destrezas en la producción agraria y en el manejo de especies de ecosistemas con ambientes naturales.

  3. Arquitecturas multiprocesador en computación de alto desempeño: software, métricas, modelos y aplicaciones

    OpenAIRE

    De Giusti, Armando Eduardo; Tinetti, Fernando Gustavo; Naiouf, Marcelo; Chichizola, Franco; De Giusti, Laura Cristina; Villagarcía Wanza, Horacio A.; Montezanti, Diego Miguel; Encinas, Diego; Pousa, Adrián; Rodriguez, Ismael Pablo; Rodriguez Eguren, Sebastián; Iglesias, Luciano; Paniego, Juan Manuel; Pi Puig, Martín; Dell'Oso, Matías

    2017-01-01

    Caracterizar las arquitecturas multiprocesador distribuidas enfocadas especialmente a cluster y cloud computing, con énfasis en las que utilizan procesadores de múltiples núcleos (multicores, GPUs y Xeon Phi), con el objetivo de modelizarlas, estudiar su escalabilidad, analizar y predecir performance de aplicaciones paralelas, estudiar el consumo energético y su impacto en la perfomance así como desarrollar esquemas para detección y tolerancia a fallas en las mismas. Profundizar el estudio...

  4. Análisis de Desarrollo de Software Orientado a Feature - Línea de Producto de Software para Aplicaciones de TVDI

    Directory of Open Access Journals (Sweden)

    Mirtha Fabiana Miranda

    2015-08-01

    Full Text Available El Desarrollo de Software Orientado a Features (FOSD consiste en la construcción de sistemas a partir de un conjunto de características, cada feature o característica es una unidad funcional que satisface un requisito de software. Las fases son análisis del dominio, diseño e implementación del dominio, configuración y generación del producto de software, obteniendo así una Línea de Productos de Software (SPL. El presente trabajo realiza una comparación de herramientas para su implementación y, se analiza un conjunto de aplicaciones que modelan features. Resultando un espacio de estudio abierto para modelar aplicaciones para la Televisión Digital Interactiva (TVDi. Además se han encontrado diversos métodos, artefactos y patrones de diseño para el modelado de una aplicación de TVDi en particular, reflejando un estudio para el modelado de variabilidad. El objetivo principal es estudiar SPL / FOSD, empleando los Patrones de Diseño de Interacción (PDI para el dominio de las aplicaciones de TVDi.

  5. El papel de las variables sociodemográficas en el uso de las aplicaciones basadas en Internet por los Mayores

    Directory of Open Access Journals (Sweden)

    Begoña Peral Peral

    2013-06-01

    Full Text Available La población mundial está envejeciendo progresivamente. Se prevé que en 2050 el número de personas mayores de 60 años alcance los dos mil millones en el mundo. El empleo de las Tecnologías de la Información y Comunicación (TIC puede suponer para la población de mayor edad un impacto significativo en su calidad de vida, contribuyendo a conseguir mayores activos, disminuyendo la marginalización y el aislamiento social. Aunque existen diferencias importantes en el uso que los Mayores hacen de Internet y sus aplicaciones respecto al resto de la población, hay que considerar que este segmento no constituye un grupo homogéneo. Este trabajo busca comprobar si dentro del grupo de los Mayores existen diferencias en la frecuencia de uso de distintas aplicaciones basadas en Internet, en función de la edad, el sexo, el nivel de estudios alcanzados y la actividad laboral desarrollada en el pasado. Los resultados demuestran que existen diferencias significativas en el empleo de algunas aplicaciones en función de las variables sociodemográficas analizadas.

  6. Modelizacion, control e implementacion de un procesador energetico paralelo para aplicacion en sistemas multisalida

    Science.gov (United States)

    Ferreres Sabater, Agustin

    modelizacion, y aplicacion en convertidores PWM, esta aun por estudiar y valorar. El primer Capitulo consiste en una breve introduccion al problema de la regulacion cruzada y la impedancia cruzada para posteriormente describir las tecnicas de post-regulacion actualmente mas empleadas, con especial atencion al post-regulador con transformador controlado. El Capitulo segundo trata del estudio de las caracteristicas estaticas del postregulador con transformador controlado. Partiendo de los estudios disponibles sobre el postregulador se plantean mejoras en su modo de actuacion y se discuten tres alternativas diferentes para controlar el transformador. Las dos primeras consisten en emplear un convertidor auxiliar Boost en sus dos modos de funcionamiento, continuo y discontinuo. La tercera consiste en controlar el transformador con una tension PWM directamente, sin filtrado. Finalmente se comprueba experimentalmente, para el estado estacionario, el funcionamiento del post-regulador para cada uno de los tres metodos de control. El Capitulo tercero trata de la dinamica de la salida controlada con el post-regulador cuando este emplea un convertidor auxiliar tipo Boost. Mediante la tecnica de promediado de variables de estado se propone el modelo de pequena senal, tanto para el modo continuo como para el modo discontinuo de funcionamiento del convertidor auxiliar. Los resultados mas significativos de esta seccion son las expresiones analiticas de las impedancias cruzadas y de la impedancia de la salida post-regulada. Como complemento al modelo de pequena senal se plantea un modelo de gran senal implementado sobre el simulador Pspice. Con este nuevo modelo se reproducen los resultados obtenidos con el modelo de pequena senal y ademas es posible simular los transitorios en las tensiones de salida ante cambios de carga. La modelizacion del convertidor cuando el transformador se controla con una tension PWM sin filtrar es el objetivo del Capitulo 4. En las secciones siguientes del Capitulo

  7. Advances and applications of rock physics for hydrocarbon exploration; Avances y aplicaciones en fisica de rocas para exploracion de hidrocarburos

    Energy Technology Data Exchange (ETDEWEB)

    Vargas-Meleza, L.; Valle-Molina, C. [Instituto Mexicano del Petroleo (Mexico)]. E-mails: lvargasm@imp.mx; cvallem@imp.mx

    2012-10-15

    Integration of the geological and geophysical information with different scale and features is the key point to establish relationships between petrophysical and elastic characteristics of the rocks in the reservoir. It is very important to present the fundamentals and current methodologies of the rock physics analyses applied to hydrocarbons exploration among engineers and Mexican students. This work represents an effort to capacitate personnel of oil exploration through the revision of the subjects of rock physics. The main aim is to show updated improvements and applications of rock physics into seismology for exploration. Most of the methodologies presented in this document are related to the study the physical and geological mechanisms that impact on the elastic properties of the rock reservoirs based on rock specimens characterization and geophysical borehole information. Predictions of the rock properties (lithology, porosity, fluid in the voids) can be performed using 3D seismic data that shall be properly calibrated with experimental measurements in rock cores and seismic well log data. [Spanish] Se discuten los fundamentos de fisica de rocas y las implicaciones analiticas para interpretacion sismica de yacimientos. Se considera conveniente difundir, entre los ingenieros y estudiantes mexicanos, los fundamentos y metodologias actuales sobre el analisis de la fisica de rocas en exploracion de hidrocarburos. Este trabajo representa un esfuerzo de capacitacion profesional en exploracion petrolera en el que se difunde la relevancia de la fisica de rocas. El interes principal es exponer los avances tecnologicos y aplicaciones actuales sobre fisica de rocas en el campo de sismologia de exploracion. La mayoria de las metodologias estudia los mecanismos fisicos y geologicos que controlan las propiedades elasticas de los yacimientos de hidrocarburos, a partir de nucleos de roca y registros geofisicos de pozo. Este conocimiento se usa para predecir propiedades de la

  8. Integral power evaluation in fossil fuel power plants; Evaluacion energetica integral en unidades de centrales termoelectricas

    Energy Technology Data Exchange (ETDEWEB)

    Figueroa I, Luis R; Sanchez H, Laura E; Rodriguez M, Jose H [Instituto de Investigaciones Electricas, Cuernavaca, Morelos (Mexico); Nebradt G, Jesus [Unidad de Investigacion y Desarrollo de la Subdireccion de Generacion de la Comision Federal de Electricidad, (Mexico)

    2006-07-01

    In this occasion, a methodology is presented that carries out an integral energy evaluation of fossil fuel power plants units (FFPPU) with the purpose of determining the root of the significant decrements of power produced soon after the annual maintenance service. This proposal, besides identifying the origin of the energy efficiency problems, offers information about the contributions of each one of the involved equipment in the total decrement of the unit. With this methodology, the maintenance focuses in the equipment that contributes to the greater energy loss. This document presents such methodology along with its application in a real case, results and necessary remedial actions, demonstrating that its application offers bases for the investment in corrective measures. [Spanish] En esta ocasion se presenta una metodologia que efectua una evaluacion energetica integral de las unidades de centrales termoelectricas (UCT) con el fin de determinar la raiz de los decrementos de potencia significativos producidos luego del servicio anual de mantenimiento. Dicha propuesta, ademas de identificar el origen de los problemas de eficiencia energetica, brinda informacion acerca de las aportaciones de cada uno de los equipos involucrados al decremento total de la unidad. Con esta metodologia, el mantenimiento se enfoca a los equipos que contribuyen a la mayor perdida de potencia. Este documento exhibe tal metodologia junto con su aplicacion en un caso real, resultados y las acciones correctivas necesarias, demostrando que su aplicacion ofrece bases para una inversion futura en medidas correctivas.

  9. Reliability and accuracy of real-time visualization techniques for measuring school cafeteria tray waste: validating the quarter-waste method.

    Science.gov (United States)

    Hanks, Andrew S; Wansink, Brian; Just, David R

    2014-03-01

    Measuring food waste is essential to determine the impact of school interventions on what children eat. There are multiple methods used for measuring food waste, yet it is unclear which method is most appropriate in large-scale interventions with restricted resources. This study examines which of three visual tray waste measurement methods is most reliable, accurate, and cost-effective compared with the gold standard of individually weighing leftovers. School cafeteria researchers used the following three visual methods to capture tray waste in addition to actual food waste weights for 197 lunch trays: the quarter-waste method, the half-waste method, and the photograph method. Inter-rater and inter-method reliability were highest for on-site visual methods (0.90 for the quarter-waste method and 0.83 for the half-waste method) and lowest for the photograph method (0.48). This low reliability is partially due to the inability of photographs to determine whether packaged items (such as milk or yogurt) are empty or full. In sum, the quarter-waste method was the most appropriate for calculating accurate amounts of tray waste, and the photograph method might be appropriate if researchers only wish to detect significant differences in waste or consumption of selected, unpackaged food. Copyright © 2014 Academy of Nutrition and Dietetics. Published by Elsevier Inc. All rights reserved.

  10. Characterization of Mitogen-Activated Protein Kinase Expression in Nucleus Accumbens and Hippocampus of Rats Subjected to Food Selection in the Cafeteria Diet Protocol.

    Science.gov (United States)

    Sarro-Ramírez, Andrea; Sánchez, Daniel; Tejeda-Padrón, Alma; Buenfil-Canto, Linda Vianey; Valladares-García, Jorge; Pacheco-Pantoja, Elda; Arias-Carrión, Oscar; Murillo-Rodríguez, Eric

    2016-01-01

    Obesity is a world-wide health problem that requires different experimental perspectives to understand the onset of this disease, including the neurobiological basis of food selection. From a molecular perspective, obesity has been related with activity of several endogenous molecules, including the mitogenactivated protein kinases (MAP-K). The aim of this study was to characterize MAP-K expression in hedonic and learning and memory brain-associated areas such as nucleus accumbens (AcbC) and hippocampus (HIPP) after food selection. We show that animals fed with cafeteria diet during 14 days displayed an increase in p38 MAP-K activity in AcbC if chose cheese. Conversely, a diminution was observed in animals that preferred chocolate in AcbC. Also, a decrease of p38 MAP-K phosphorylation was found in HIPP in rats that selected either cheese or chocolate. Our data demonstrate a putative role of MAP-K expression in food selection. These findings advance our understanding of neuromolecular basis engaged in obesity.

  11. The use of point-of-sale machines in school cafeterias as a method of parental influence over child lunch food choices.

    Science.gov (United States)

    Andrepont, Emmy; Cullen, Karen W; Taylor, Wendell C

    2011-05-01

    Computerized point-of-sale (POS) machine software that allows parents to place restrictions on their child's school meal accounts is available. Parents could restrict specific foods (eg, chips), identify specific days the child can purchase extra foods, or set monetary limits. This descriptive study examines the use of parental restrictions on student cafeteria POS accounts in a convenience sample of 2 school districts. POS alerts, with student gender, grade, ethnicity, and students' free or reduced-price meal eligibility, were obtained from 2 school food service departments for the 2007-2008 school year. The alerts were coded into 5 categories: financial, medical, restrictions, snacks OK, and extras OK. The distribution of alerts by district, students, and demographics was then tabulated. District A (4839 students) had more students with alerts (n = 789, 16%) than District B (8510 students; n = 217, 2.6%), and 94 District A students had a second alert. District A parents had to provide written permission for their child to purchase snacks (n = 654, 13.5%) and extra meal items (n = 113, 2.3%). Most alerts were for full-pay students in both districts (74% and 66%) and varied by demographics of the students. Few parents actually used this system to limit student purchases of foods outside the school meal. Future studies should investigate the influence of these restrictions on student food choices. © 2011, American School Health Association.

  12. Aplicaciones clínicas de células madre de origen dental

    OpenAIRE

    Gross de Bethencourt, Concepcion

    2013-01-01

    Localización, identificación y aplicación preclínica de células madre de origen dental en patología odontológica (periodoncia regenerativa, endodoncia regenerativa, implantologia y regeneración dental) y patología no odontológica (patología del sistema nervioso central, enfermedades neurodegenerativas, distrofia muscular de Duchenne, diabetes y patologia cardiaca)

  13. Desarrollo de materiales poliméricos nanocompuestos para aplicaciones eléctricas y electrónicas

    Directory of Open Access Journals (Sweden)

    Bruno Chinè

    2007-05-01

    Full Text Available Se reportan algunos resultados y procedimientos experimentales de laboratorio obtenidos en el marco de investigaciones desarrolladas para la obtención de nuevos materiales compuestosnanoestructurados. Estos nuevos materiales, formados por una fase orgánica el polímero y una fase inorgánica el silicato, están siendo fuertemente investigados en la actualidad pues se espera que puedan brindar, entre otras, mejores propiedades de aislamiento eléctrico y de retardo a la flama en aplicaciones eléctricas y electrónicas. El trabajo experimental de laboratorio ha sido desarrollado a partir de dos familias de polímeros, los termoplásticos y los termoestables y de las arcillas que proporcionan los silicatos de tipo lamelar. Se cuenta ya con algunos resultados preliminares, como son la obtención de películas delgadas de estos materiales nanocompuestos, su completa caracterización mediante difractometría de rayos X, microscopía de barrido y análisistermogravimétrico, que hacen bien esperar para futuras actividades de investigación.

  14. Framework para desarrollo de aplicaciones educativas móviles, basado en modelos de enseñanza

    Directory of Open Access Journals (Sweden)

    William Oswaldo Cuervo Gómez

    2017-05-01

    Full Text Available Los adelantos tecnológicos registrados en los últimos años en el sector de los dispositivos móviles han permitido contar con mejores especificaciones de hardware y software. Iniciativas como la del gobierno de Colombia, que tiene el propósito de dotar con tabletas a las instituciones educativas oficiales del país, motivaron el interés de docentes y demás actores del proceso educativo por proponer estrategias para la incorporación de dispositivos móviles en contextos educativos. En esta perspectiva, la presente investigación tiene como propósito proponer un framework, que permite combinar aspectos pedagógicos y tecnológicos en el proceso de desarrollo de aplicaciones educativas móviles, que respondan a las necesidades del entorno educativo al cual serán incorporadas. Este documento muestra los resultados obtenidos en la investigación desarrollada en cuatro etapas metodológicas: diagnóstico, conceptualización y caracterización, propuesta e implementación del framework, y análisis de resultados.

  15. EL ENFOQUE CRÍTICO: Una revisión de su historia, naturaleza y algunas aplicaciones

    Directory of Open Access Journals (Sweden)

    Nora Cebotarev

    2003-05-01

    Full Text Available La intención de este artículo es explorar las bases filosóficas e históricas de los múltiples y complejos significados y usos del Pensamiento Crítico (PC. El PC es definido como un método, analítico y autoreflexivo, teóricamente sustentado, de crítica de ideologías y prácticas convencionales, incluyendo la vida cotidiana, los sistemas políticos, el método científico de crear conocimientos y los del mismo PC. Su propósito es reunir valores morales y científicos. El artículo contiene cuatro partes. La primera discute las diversas acepciones de PC. La segunda traza el origen histórico del PC, su articulación teórica por la Escuela de Frankfurt y las múltiples contribuciones filosóficas que enriquecieron y ampliaron su significado. La tercera parte discute sus requisitos epistemológicos, morales y metodológicos y la última parte presenta algunos ejemplos de las múltiples aplicaciones del PC en varios campos.

  16. El enfoque crítico: una revisión de su historia, naturaleza y algunas aplicaciones

    Directory of Open Access Journals (Sweden)

    Eleanora A. Cebotarev

    2003-01-01

    Full Text Available La intención de este artículo es explorar las bases filosóficas e históricas de los múltiples y complejos significados y usos del Pensamiento Critico (PC. El PC es definido como un método, analítico y autoreflexivo, teóricamente sustentado, de crítica de ideologías y prácticas convencionales, incluyendo la vida cotidiana, los sistemas políticos, el método científico de crear conocimientos y los del mismo PC. Su propósito es reunir valores morales y científicos. El artículo contiene cuatro partes. La primera discute las diversas acepciones de PC. La segunda traza el origen histórico del PC, su articulación teórica por la Escuela de Frankfurt y las múltiples contribuciones filosóficas que enriquecieron y ampliaron su significado. La tercera parte discute sus requisitos epistemológicos, morales y metodológicos y la última parte presenta algunos ejemplos de las múltiples aplicaciones del PC en varios campos

  17. Caracterización de la superaleación ODS MA 956 para aplicaciones biomédicas

    Directory of Open Access Journals (Sweden)

    Escudero, M. I.

    1998-05-01

    Full Text Available Since the MA 956 was proposed as a possible new biomaterial due to its good corrosion resistance values in physiological fluids a long way, still not finished, has been done. An exhaustive characterization of this alloy at room temperature has been developed. The technological objectives are well established: the possible use of this material for biomedical applications as hip or knee prostheses and as dental implants. The study was performed comparing the results of this alloy with the materials used nowadays as surgical implants, i.e., titanium alloys and polyethylene.

    Desde que la MA 956 fue propuesta como posible nuevo biomaterial en base a su buena resistencia a la corrosión frente a sueros fisiológicos, un largo camino, aún sin finalizar, se ha recorrido, en el que se ha llevado a cabo una caracterización exhaustiva de esta aleación a temperatura ambiente con fines tecnológicos bien definidos: su posible uso en aplicaciones biomédicas, bien sea como prótesis de cadera o de rodilla y para implantes dentales. Los estudios se han llevado a cabo comparando esta aleación con los materiales más comúnmente utilizados en implantes ortopédicos como aleaciones de titanio y polietileno.

  18. Procedimiento para la mejora del proceso de desarrollo de software en la UEB “Aplicaciones de Redes”.

    Directory of Open Access Journals (Sweden)

    Marely Collazo Palmero

    2013-07-01

    Full Text Available Esta investigación tiene como propósito desarrollar un procedimiento para la mejora del proceso de desarrollo de software en la UEB “Aplicaciones de Redes”, el procedimiento se compone de 6 etapas basadas en el ciclo de Deming que comienza con el diagnóstico de la situación actual del proceso productivo, se detectan los problemas existentes y sus causas para elaborar un plan de acción que da lugar a los aportes más significativos de esta investigación: la elaboración del flujograma del servicio de desarrollo de software y los procedimientos e instrucciones necesarios, logrando la estandarización de las herramientas a usar y los artefactos a cumplir en cada etapa del ciclo de vida del software, permitiendo de una forma rápida y organizada el cumplimiento de los requisitos del cliente. Se emplean técnicas y herramientas como conformación del grupo de expertos, tormenta de ideas, lista de chequeo, diagrama causa efecto, revisión de documentos, diagrama de flujo y gráficos de barra tanto para la obtención de información como para facilitar el análisis de los resultados arrojados. El procedimiento contribuye a elevar el por ciento de satisfacción de los clientes involucrando a todo el personal del área productiva.

  19. The chemical equilibrium under non-ideal conditions: industrial applications; El equilibrio quimico bajo condiciones no ideales: aplicaciones industriales

    Energy Technology Data Exchange (ETDEWEB)

    Silva Martinez, Susana; Alvarez Gallegos, Alberto; Quere, Alain [Instituto de Investigaciones Electricas, Cuernavaca (Mexico)

    1993-05-01

    In this paper is described the application of a computer program to the chemical equilibrium in non-ideal conditions (aqueous solutions of multicomponent electrolytes in the ionic forces interval: 0 < 1 < 6 mol/Kg H{sub 2}O and temperatures close to 25 celsius degrees), and its importance at industrial scale. The calculation of the thermodynamic properties of the solution (activity coefficients, osmotic coefficient, and water activity) is based in one of the most modern theories of the electrolytes; the theoretical results, compared with the experimental ones have an error of 10% or better. [Espanol] En este trabajo se describe la aplicacion de un programa de computo al equilibrio quimico en condiciones no ideales (soluciones acuosas de electrolitos multicomponentes en el intervalo de fuerzas ionicas: 0 < 1 < 6 mol/Kg H{sub 2}O y temperaturas cercanas a 25 grados celsius) y su importancia a escala industrial. El calculo de las propiedades termodinamicas (coeficientes de actividad, coeficiente osmotico y actividad del agua) de la solucion, esta basado en una de las teorias mas modernas de los electrolitos; los resultados teoricos comparados con los experimentales tienen un error del 10% o mejor.

  20. Central Solenoid

    CERN Multimedia

    2002-01-01

    The Central Solenoid (CS) is a single layer coil wound internally in a supporting cylinder housed in the cryostat of the Liquid Argon Calorimeter. It was successfully tested at Toshiba in December 2000 and was delivered to CERN in September 2001 ready for integration in the LAr Calorimeter in 2003. An intermediate test of the chimney and proximity cryogenics was successfully performed in June 2002.

  1. Caracterización del proceso y herramientas metodológicas de la ingeniería de requerimientos para aplicaciones de sistemas de información geográfica

    Directory of Open Access Journals (Sweden)

    Luis Fernando Medina Cardonal

    2007-01-01

    Full Text Available Este artículo describe el proceso de la ingeniería de requerimientos y las herramientas metodológicas usadas en aplicaciones de sistemas de información geográfica (SIG ante la ausencia de una alternativa integral y consistente específica para este dominio. Para ello, por un lado, se introduce la problemática de la ingeniería de requerimientos en aplicaciones SIG, se exhiben los tipos de requerimientos, actores involucrados y aspectos comunicativos relevantes en el proceso de requerimientos y se clasifican las metodologías existentes en lenguajes de modelamiento y especificación. Adicionalmente, se presentan los estándares geomáticos como un elemento transversal a tener en cuenta en las aplicaciones SIG.

  2. Central sleep apnea

    Science.gov (United States)

    Sleep apnea - central; Obesity - central sleep apnea; Cheyne-Stokes - central sleep apnea; Heart failure - central sleep apnea ... Central sleep apnea results when the brain temporarily stops sending signals to the muscles that control breathing. The condition ...

  3. Del telegrama a los tweets: investigación sobre la interacción del adulto mayor con las redes sociales y aplicaciones Google considerando aspectos de usabilidad y accesibilidad web

    OpenAIRE

    Díaz, Francisco Javier; Harari, Ivana

    2015-01-01

    En este artículo se presenta el estado de avance de la tesina “Del Telegrama a los Tweets: Investigación sobre la Interacción del Adulto Mayor con las Redes Sociales y Aplicaciones Google, considerando Aspectos de Usabilidad y Accesibilidad Web” para el magister de Redes de Datos de la Fac.de Informática de la Universidad Nacional de La Plata. La misma consiste en una investigación integral sobre la interacción entre los adultos mayores y las aplicaciones de Web 2.0 actuales como Facebook y T...

  4. Implementación de un sistema de desarrollo de aplicaciones en contenedores Docker y su automatización a través de un bot de Slack

    OpenAIRE

    Redondo de Álvaro, Eloy

    2017-01-01

    Este trabajo trata del desarrollo y la implementación de un nuevo sistema de automatización para el desarrollo de aplicaciones en la empresa MADISON Experience Marketing en la que me encuentro realizando una beca. El sistema de automatización empleará un sistema de desarrollo de aplicaciones en contenedores Docker. Gracias a este sistema, el desarrollo por parte de los distintos equipos de la empresa, podrá realizarse de una forma más ágil e independiente. El sistema consistirá en tres ...

  5. Funcionalización de nanomateriales de carbono: Propiedades optoelectrónicas de nanotubos de carbono y aplicaciones de nanopartículas de diamante en catálisis y biocatálisis

    OpenAIRE

    Martín González, Roberto

    2011-01-01

    TÍTULO: Funcionalización de nanomateriales de carbono: Propiedades optoelectrónicas de nanotubos de carbono y aplicaciones de nanopartículas de diamante en catálisis y biocatálisis. INTRODUCCIÓN: En las últimas décadas los nanomateriales han adquirido gran importancia debido a su repercusión en la sociedad. De entre los nanomateriales, aquellos basados en carbono se encuentran entre los más estudiados por sus potenciales aplicaciones. La presente tesis doctoral se ha centrado en la fun...

  6. Desarrollo de un algoritmo en MATLAB para la optimización de la resolución de una tarjeta USRP B210 para aplicaciones SDRadar

    Directory of Open Access Journals (Sweden)

    David Moreno Avilés

    2017-11-01

    Full Text Available En este documento se analizan las limitaciones y características que tiene la tarjeta USRP (Universal Software Radio Peripheral B210 para desarrollar aplicaciones de radar definidos por software (SDRadar. Para el desarrollo del algoritmo se utilizó un radar de onda continua modulada en frecuencia (FMCW que implementa una señal chirp, al considerar que 25 MHz es el máximo ancho de banda que la tarjeta puede proporcionar se obtiene como resultado una resolución de 6 metros. El método utilizado para optimizar la resolución de la tarjeta fue transmitir un determinado número de señales con distintos anchos de banda, lo que resulta en una resolución diferente, al detectar y almacenar el objetivo en una matriz. Después de las pruebas correspondientes el algoritmo estableció que con 14 mediciones con variaciones de ancho de banda de 0.5 MHz, entre cada señal, se obtiene la mayor optimización para mejorar la resolución de la tarjeta. Se obtuvo finalmente dos zonas de optimización, donde la primera zona está limitada por un error de medición menor a 1 metro, y en la segunda zona con un error de medición entre 1 y 2 metros con 69.15% y 30.85% de objetivos detectados respectivamente, lo que determina su efectividad y confiabilidad. Este trabajo ha demostrado que el algoritmo utilizado es útil en aplicaciones SDRadar para detectar objetivos para aplicaciones topográficas o sistemas SAR.

  7. Herramientas y recursos para la creación y consumo musical en la web 2.0. Aplicaciones y potencialidades educativas

    Directory of Open Access Journals (Sweden)

    Felipe Gértrudix Barrio

    2014-01-01

    Full Text Available Desde la aparición de Internet, y en especial el desarrollo de los servicios y herramientas que caracterizan a la web 2.0, la creación y el consumo musical se han expandido significativamente. En ese proceso, los nativos digitales, usuarios activos de estos nuevos medios, experimentan e innovan continuamente con nuevas formas de producir y disfrutar la música de forma colectiva en entornos distribuidos de Red. El articulo evalúa las posibilidades de integración de esta realidad como un activo educativo en las aulas de música de Enseñanza Secundaria, analizando cuales son los servicios y herramientas que ofrecen mejores posibilidades para facilitar dinámicas y estrategias didácticas innovadoras de aprendizaje musical. Para ello, se ha realizado una amplia revisión documental de fuentes de referencia publicadas en los últimos 15 anos referidas a las potencialidades didácticas musicales de la creación colaborativa en Red, se ha elaborado un corpus de servicios y aplicaciones web 2.0 de creación y consumo musical, y se ha analizado una muestra de estas para determinar sus características y aplicaciones educativas concretas. Se concluye el articulo manifestando la oportunidad que el uso de estas aplicaciones representa para mejorar la predisposición de los estudiantes hacia la materia, la incentivan de los procesos creativos musicales, el desarrollo de competencias especificas de análisis y composición y la capacidad critica y reflexiva tanto sobre el proceso creador como sobre el producto musical alcanzado.

  8. Energy saving in hotels by means of heat pumps application; Ahorro de energia en hoteles mediante la aplicacion de bombas de calor

    Energy Technology Data Exchange (ETDEWEB)

    Romero Paredes R, Hernando; Ambriz G, Juan Jose [Universidad Autonoma Metropolitana, Unidad Iztapalapa (Mexico)

    2005-07-15

    The thermal energy is presented as an alternate saving technology for utilities by means of the acute implementation of heat pumps. The objective is to demonstrate the technical and economical feasibility of the application of commercial heat pumps to installations where the handling of opposite temperatures for the conditioning of a space and/or of a fluid is required. In this article it is described the functioning of a heat pump, its different operation principles or types as well as the large diversity of applications they can have in industry, utilities and residential buildings. As an application example the substitution of an electric boiler by a heat pump is presented in a hotel installation and its differences in performance regarding the environmental conditioning of a nearby area and the heating of swimming pool water are analyzed. [Spanish] Se presenta la energia termica como una tecnologia de ahorro alterna para empresas de servicios valiendose de la implementacion agudizada de bombas de calor. El objetivo es demostrar la factibilidad tecnica y economica de la aplicacion de bombas de calor comerciales a instalaciones donde se requiere la manipulacion de temperaturas opuestas para el acondicionamiento de un espacio y/o un fluido. Se describe el funcionamiento de una bomba de calor, sus diferentes principios de operacion o tipos, asi como la gran diversidad de aplicaciones que pueden tener en la industria, empresas de servicios y edificios residenciales. Como ejemplo de aplicacion se presenta la sustitucion de una caldera electrica por una bomba de calor en una instalacion hotelera y sus diferencias de rendimiento en el calentamiento de agua de alberca y el acondicionamiento ambiental de un area cercana.

  9. OOWS 2.0: UN MÉTODO DE INGENIERÍA WEB DIRIGIDO POR MODELOS PARA LA PRODUCCIÓN DE APLICACIONES WEB 2.0

    OpenAIRE

    Valverde Giromé, Francisco

    2011-01-01

    Los métodos de Ingeniería Web dirigidos por modelos han mejorado tanto la calidad como la eficiencia a la hora de desarrollar aplicaciones Web. Estos métodos utilizan modelos conceptuales para capturar de forma abstracta una representación detallada de la aplicación Web a desarrollar. La ventaja más destacada de esta aproximación es que a partir de estos modelos, ampliamente validados en entornos industriales, es factible la generación sistemática del código que implementa la ...

  10. Desarrollo de composites de base de nanoparticulas de FeNi obtenidas por el metodo de explosion de hilo para alas aplicaciones de altas frecuencias

    OpenAIRE

    Madinabeitia Terrones, Iñaki

    2014-01-01

    Actualmente ningún área científica es ajena a la revolución de la nanociencia; las nanopartículas atraen el interés de muchos investigadores desde el punto de vista de la ciencia fundamental y para sus aplicaciones tecnológicas. Las nanopartículas ofrecen la posibilidad de fabricar sensores que sean capaces de detectar desde un virus hasta concentraciones de substancias patógenas que no pueden ser detectadas por los métodos convencionales. Hoy en día existes 82 tratamientos contra el cáncer b...

  11. Analizar el aporte a las soluciones en aplicaciones móviles para el comercio electrónico en la ciudad de Quito

    OpenAIRE

    Vizuete Flores, Milton Renato

    2012-01-01

    Los antecedentes que podemos mencionar es el gran auge que ha tenido las comunicaciones móviles, desde hace varios años atrás comenzando con los primeros Smartphone’s con acceso a Internet muy básico y de muy poca utilidad pero siendo un pilar fundamental para el desarrollo de nuevas y mejores tecnologías móviles cada vez con mejores prestaciones hasta llegar a disponer de aplicaciones desarrolladas para equipos móviles que es el objeto de estudio de esta tesis, cuando una empresa dispone de ...

  12. APLICACIONES, VENTAJAS Y LIMITACIONES DEL MODELAJE DEL NICHO ECOLÓGICO PARA EL MANEJO Y CONSERVACIÓN DE GRUPOS CON DIFERENTES HISTORIAS DE VIDA

    OpenAIRE

    Ortega Rodríguez, Juan Manuel

    2012-01-01

    En este trabajo se exploraron tres aplicaciones de la modelación espacial del nicho ecológico. En primera instancia, se hace un análisis de las características geográficas de los sitios de anidación del loro corona lila, en una aplicación en la que no se usan algoritmos sofisticados para modelar, sino una metodología más tradicional, dentro del ambiente de los sistemas de información geográfica, pero que nos permitió contribuir al entendimiento de las preferencias de anidación de ...

  13. Software como servicio en aplicaciones de misión crítica: ERP y CRM en la mediana empresa

    OpenAIRE

    Duque Velásquez, Camilo

    2008-01-01

    En este trabajo se presenta una recopilación de información que facilita la evaluación de alternativas en adopción de aplicaciones de misión crítica ERP y CRM bajo el modelo de software-como-servicio -- Para ello se hace una conceptualización de términos y un comparativo en esquemas de implementación de los modelos bajo-premisa, ASP y SaaS que permite identificar sus diferencias, fortalezas y debilidades -- Se realiza también una conceptualización de las implicaciones y contribuciones del...

  14. Desarrollo de un conjunto de aplicaciones para detección de ataques en redes IPv4/IPv6 utilizando Python

    OpenAIRE

    Melgar Jara, Erick Santiago

    2015-01-01

    El complejo mundo de la seguridad informática presenta novedades día a día y requiere que el auditor de red se encuentre en constante crecimiento profesional. Los auditores de seguridad suelen disponer de un kit de herramientas o aplicaciones para ejercer sus proyectos. El siguiente trabajo comprende en realizar una herramienta para dichos auditores de red los cuales necesitan detectar los múltiples ataques producidos por personas ajenas que desean perjudicar a los usuarios obteniendo su info...

  15. Desenvolupament d'activitats d'Ensenyament/Aprenentatge sobre bones pràctiques i seguretat pel CFGS Desenvolpament d'Aplicacions Web

    OpenAIRE

    Marquina de Castro, Víctor

    2016-01-01

    L'objectiu d'aquest treball és dissenyar tres activitats d'ensenyament aprenentatge per a proposar un canvi per la millora de la metodologia, en la Unitat Formativa 3: tècniques d'accés a dades del mòdul Desenvolupament web en Entorns Servidor que pertany al cicle formatiu de grau superior Desenvolupament d'Aplicacions Web de la família d'Informàtica. En els últims anys, s'han publicat notícies que han posat el focus en els problemes de seguretat que es troben en diferents serv...

  16. Evaluación de la degradación por termoxidación de termoplásticos empleados en aplicaciones agrícolas

    OpenAIRE

    Kerguelen,Herbert; Mejia,José Luis; Ramírez,Margarita; Cardona,Mónica; Gañán,Piedad

    2009-01-01

    Poliolefinas como el polipropileno son ampliamente utilizadas en el campo agrícola, en particular para la protección y sostenimiento de plantas. Sin embargo, su masivo consumo viene generando importantes problemas ambientales. En este estudio muestras de polipropileno y sus mezclas con almidón y un biopolìmero como el Mater-Bi, los cuales se pueden emplear en este tipo de aplicaciones, han sido sometidas a un proceso de degradación térmica o termoxidación. Diferentes condiciones de temperatur...

  17. Obtención de velos de nanofibras de alcohol de polivinilo (PVA) sobre substratos textiles, con aplicaciones como absorbentes acústicos

    OpenAIRE

    BLANES COMPANY, MARÍA

    2011-01-01

    La tecnología de la electrohilatura, mediante la que se obtienen filamentos de polímero utilizando una fuerza electrostática, a partir de la disolución de polímero cargado eléctricamente, se ha convertido en los últimos años en la tecnología más popular para la obtención de velos de nanofibras, habiéndose desarrollado dispositivos capaces de obtener de forma contínua y a escala industrial dichos velos, para ser utilizados en aplicaciones tan diversas como son la filtración, defensa y segurida...

  18. Diseño y desarrollo de una pasarela de interoperabilidad 802.15.4/802.3 para aplicaciones de sensores

    OpenAIRE

    López López, Gregorio Ignacio

    2008-01-01

    En los últimos años, las redes de sensores inalámbricas o WSNs (Wireless Sensor Networks) están ganando importancia en el sector de las telecomunicaciones debido a sus muchas y muy variadas aplicaciones. Se trata de redes de dimensiones reducidas, que requieren anchos de banda escasos, bajo consumo y bajo coste de despliegue y mantenimiento. Para promocionar y potenciar la incorporación de este tipo de redes al mercado de forma competitiva, el IEEE (Institute of Electrical and ...

  19. Posicionamiento y proyección actual del motor de paso en aplicaciones industriales. // Position and proyection in actual industrial applications of stepping motors.

    Directory of Open Access Journals (Sweden)

    A. Codina García

    2002-05-01

    Full Text Available El presente trabajo aborda el empleo del motor de paso en las aplicaciones industriales actuales, los recientesavances y tendencias en la construcción de los mismos así como sus principales características y variantes másconocidas.Palabras claves: Motores de paso, control de movimiento.______________________________________________________________________Abstract.This paper focuses on the position of stepping motors in current industrial applications, recent advances andgeneral trends in design and manufacturing such motors. Their most outstanding features and different typesare also shown.Key words: Stepping motors, motion control.

  20. PRIBIC Application; Aplicacion para la Monitorizacion de una Planta Experimental de Combustion de Biomasa

    Energy Technology Data Exchange (ETDEWEB)

    Alonso, P.; Barcala Rivas, J. M.

    2002-07-01

    PRIBIC pant (Pollutants Reduction In small Blomass Combustion systems) at CEDER is a facility specifically designed to do biomass combustion tests. In these tests is necessary to known the values of different sensors in real time. With this information the PRIBIC plant is regulated to its optimum point of work and it's possible to follow the operation criteria and get test objectives. Different electronic instruments record information about the plant operation. A software application was developed to let a centralized monitorization of that information. the application communicates with the instrumentation, recovers data, lets operators see data in real time and saves the information in files. An important part of this document describes that application, and some considerations to generalize this kind of developments to other Experimental Plants, including cost estimations. Descriptions of plants, analysis of the problem, result evaluations, and conclusions can also be found in the document. (Author) 13 refs.

  1. Fundamentos y aplicaciones del diseño de casos cruzados Case-crossover design: Basic essentials and applications

    Directory of Open Access Journals (Sweden)

    Eduardo Carracedo-Martínez

    2009-04-01

    Full Text Available El diseño de casos cruzados es un diseño epidemiológico observacional propuesto por Maclure en 1991 para valorar si alguna exposición intermitente o inusual ha desencadenado un evento agudo a muy corto plazo. En este trabajo se presentan los fundamentos de los diseños de casos cruzados, con sus aplicaciones y limitaciones. El diseño de casos cruzados se basa en seleccionar sólo sujetos caso. Para calcular el riesgo relativo se compara la exposición durante el periodo de tiempo previo al evento (periodo caso con la exposición del mismo sujeto en uno o varios periodos control. Este método únicamente es adecuado cuando las exposiciones son cambiantes en el tiempo, con efectos a corto plazo, y el efecto es agudo. Para exposiciones en que no existe tendencia, el planteamiento unidireccional es el más frecuente, y consiste en seleccionar uno o varios periodos control previos al momento caso. Cuando la exposición tiene una tendencia temporal (por ejemplo las de contaminación atmosférica, el planteamiento unidireccional proporciona estimaciones sesgadas, por lo que se utilizan diseños de casos cruzados bidireccionales, que seleccionan periodos de tiempo control anteriores y posteriores al del evento. Es un método que cuenta con una creciente utilización en amplios campos: desencadenantes de accidentes de tráfico, laborales y domésticos, o de infarto agudo de miocardio, contaminación atmosférica y salud, farmacoepidemiología, etc. Para el análisis de datos, generalmente se pueden considerar los diseños de casos cruzados como estudios de casos y controles emparejados, por lo que se aplica regresión logística condicional. Finalmente, en este trabajo se analizan ejemplos prácticos de diferentes aplicaciones del diseño de casos cruzados.Case-crossover analysis is an observational epidemiological design that was proposed by Maclure in 1991 to assess whether a given intermittent or unusual exposure may have triggered an immediate

  2. Application of electro-technology in heating industrial processes; Aplicacion de electrotecnologia en procesos industriales de calentamiento

    Energy Technology Data Exchange (ETDEWEB)

    Gonzalez Milla, Guillermo [Instituto de Investigaciones Electricas, Temixco, Morelos (Mexico)

    2001-07-01

    produccion, aumentar la productividad asi como mejorar la seguridad y condiciones de trabajo. Aunado a lo anterior, las electrotecnologias ofrecen otras ventajas adicionales como facilitar la automatizacion, robotizacion y supervision computarizada de produccion industrial. La gran variedad de estas tecnologias y sus amplios campos de aplicacion hacen dificil una presentacion de ellas mostrando sus ventajas en el campo de la eficiencia energetica y con respecto al valor agregado del producto a ser terminado, asi como su impacto en el medio ambiente al disminuir los contaminantes a la atmosfera. El presente articulo menciona diversos tipos de electrotecnologias, haciendo enfasis en aquellas dedicadas a proporcionar calor debido al impacto que, por su aplicacion, pueden producir en el sistema electrico y a la deduccion de contaminantes al medio ambiente. La tabla 1 muestra el diverso rango de industrias que pueden usar electrotecnologias. Se muestra la tabla del tipo de industrias que pueden usar electrotecnologias, asi como de la evaluacion de estas.

  3. Combination of the sodium-glucose cotransporter-2 inhibitor empagliflozin with orlistat or sibutramine further improves the body-weight reduction and glucose homeostasis of obese rats fed a cafeteria diet

    Directory of Open Access Journals (Sweden)

    Vickers SP

    2014-07-01

    Full Text Available Steven P Vickers,1 Sharon C Cheetham,1 Katie R Headland,1 Keith Dickinson,1 Rolf Grempler,2 Eric Mayoux,2 Michael Mark,2 Thomas Klein2 1RenaSci, BioCity Nottingham, Nottingham, UK; 2Boehringer Ingelheim Pharma, Biberach an der Riss, Germany Abstract: The present study assessed the potential of the sodium glucose-linked transporter (SGLT-2 inhibitor empagliflozin to decrease body weight when administered alone or in combination with the clinically effective weight-loss agents orlistat and sibutramine in obese rats fed a cafeteria diet. Female Wistar rats were exposed to a cafeteria diet to induce obesity. Empagliflozin was dosed once daily (10, 30, and 60 mg/kg for 28 days. Combination studies were subsequently performed using a submaximal empagliflozin dose (10 mg/kg with either sibutramine or orlistat. Body weight, food, and water intake were recorded daily. The effect of drug treatment on glucose tolerance, relevant plasma parameters, and carcass composition was determined. Empagliflozin dose-dependently reduced body weight, plasma leptin, and body fat though increased urinary glucose excretion. The combination of empagliflozin and orlistat significantly reduced body weight compared to animals treated with either drug alone, and significantly improved glucose tolerance, plasma insulin, and leptin compared to vehicle-treated controls. The effect of sibutramine to improve glycemic control in an oral glucose-tolerance test was also significantly increased, with empagliflozin and combination treatment leading to a reduction in carcass fat greater than that observed with either drug alone. These data demonstrate that empagliflozin reduces body weight in cafeteria-fed obese rats. In combination studies, empagliflozin further improved the body-weight or body-fat loss of animals in comparison to orlistat or sibutramine alone. Such studies may indicate improved strategies for the treatment of obese patients with prediabetes or type 2 diabetes. Keywords

  4. Combination of the sodium-glucose cotransporter-2 inhibitor empagliflozin with orlistat or sibutramine further improves the body-weight reduction and glucose homeostasis of obese rats fed a cafeteria diet.

    Science.gov (United States)

    Vickers, Steven P; Cheetham, Sharon C; Headland, Katie R; Dickinson, Keith; Grempler, Rolf; Mayoux, Eric; Mark, Michael; Klein, Thomas

    2014-01-01

    The present study assessed the potential of the sodium glucose-linked transporter (SGLT)-2 inhibitor empagliflozin to decrease body weight when administered alone or in combination with the clinically effective weight-loss agents orlistat and sibutramine in obese rats fed a cafeteria diet. Female Wistar rats were exposed to a cafeteria diet to induce obesity. Empagliflozin was dosed once daily (10, 30, and 60 mg/kg) for 28 days. Combination studies were subsequently performed using a submaximal empagliflozin dose (10 mg/kg) with either sibutramine or orlistat. Body weight, food, and water intake were recorded daily. The effect of drug treatment on glucose tolerance, relevant plasma parameters, and carcass composition was determined. Empagliflozin dose-dependently reduced body weight, plasma leptin, and body fat though increased urinary glucose excretion. The combination of empagliflozin and orlistat significantly reduced body weight compared to animals treated with either drug alone, and significantly improved glucose tolerance, plasma insulin, and leptin compared to vehicle-treated controls. The effect of sibutramine to improve glycemic control in an oral glucose-tolerance test was also significantly increased, with empagliflozin and combination treatment leading to a reduction in carcass fat greater than that observed with either drug alone. These data demonstrate that empagliflozin reduces body weight in cafeteria-fed obese rats. In combination studies, empagliflozin further improved the body-weight or body-fat loss of animals in comparison to orlistat or sibutramine alone. Such studies may indicate improved strategies for the treatment of obese patients with prediabetes or type 2 diabetes.

  5. Foodborne Pathogens Recovered from Ready-to-Eat Foods from Roadside Cafeterias and Retail Outlets in Alice, Eastern Cape Province, South Africa: Public Health Implications

    Directory of Open Access Journals (Sweden)

    Roland N. Ndip

    2012-07-01

    Full Text Available This study assessed the microbiological quality of various ready-to-eat foods sold in Alice, South Africa. Microbiological analysis was conducted on 252 samples which included vegetables, potatoes, rice, pies, beef and chicken stew. The isolates were identified using biochemical tests and the API 20E, API 20NE and API Listeria kits; results were analyzed using the one-way-ANOVA test. Bacterial growth was present in all the food types tested; high levels of total aerobic count were observed in vegetables, 6.8 ± 0.07 followed by rice, 6.7 ± 1.7 while pies had the lowest count (2.58 ± 0.24. Organisms isolated included: Listeria spp. (22%, Enterobacter spp. (18%, Aeromonas hydrophila (12%, Klebsiella oxytoca (8%, Proteus mirabilis (6.3%, Staphylococcus aureus (3.2% and Pseudomonas luteola (2.4%. Interestingly, Salmonella spp. and Escherichia coli were not isolated in any of the samples. There was a statistically significant difference (p < 0.05 in the prevalence of foodborne pathogens from hygienic and unhygienic cafeterias. The results indicated that most of the ready-to-eat food samples examined in this study did not meet bacteriological quality standards, therefore posing potential risks to consumers. This should draw the attention of the relevant authorities to ensure that hygienic standards are improved to curtain foodborne infections.

  6. The effects of calorie labels on those at high-risk of eating pathologies: a pre-post intervention study in a University cafeteria.

    Science.gov (United States)

    Lillico, H G; Hanning, R; Findlay, S; Hammond, D

    2015-06-01

    The aim of the study was to examine the effect of a public policy (menu labelling) on those at high-risk for eating pathologies. Specifically, the study looked for any adverse effects related to eating disturbance level. The study employed a pre-post intervention design. Baseline collection took place in October 2012. One week prior to follow-up in November 2012, calorie labels were displayed next to virtually all menu items in a University cafeteria. Labels remained throughout the entire duration of follow-up. Participants were female undergraduates (N = 299). At baseline and follow-up, a survey assessed eating disturbance level (Eating Attitudes Test-26), emotional state, frequency of engaging in unhealthy weight-related behaviours, and calorie consumption. Generalized estimating equations were used to test changes in negative outcomes over time in response to calorie labels. Calorie consumption did not significantly decrease from baseline (mean = 660.5 kcal) to follow-up (mean = 600.5 kcal; P = 0.104). There were no changes in emotional states such as body image satisfaction (P = 0.447), anxiety (P = 0.595), positive affect (P = 0.966), negative affect (P = 0.576), and unhealthy weight-related behaviours such as binging (P = 0.268), exercising excessively (P = 0.847), or restricting calories (P = 0.504). Additionally, there were no interactions between eating disturbance level and time. Overall, no adverse outcomes were found for this at-risk population. Calorie labels did not differentially affect those with higher levels of eating disturbance. Future research should focus on examining the impact of calorie labels among those with clinical eating disorders. Copyright © 2015 The Royal Society for Public Health. Published by Elsevier Ltd. All rights reserved.

  7. Roux-en-Y gastric bypass in rats progressively decreases the proportion of fat calories selected from a palatable cafeteria diet.

    Science.gov (United States)

    Mathes, Clare M; Letourneau, Chanel; Blonde, Ginger D; le Roux, Carel W; Spector, Alan C

    2016-05-15

    Roux-en-Y gastric bypass surgery (RYGB) decreases caloric intake in both human patients and rodent models. In long-term intake tests, rats decrease their preference for fat and/or sugar after RYGB, and patients may have similar changes in food selection. Here we evaluated the impact of RYGB on intake during a "cafeteria"-style presentation of foods to assess if rats would lower the percentage of calories taken from fat and/or sugar after RYGB in a more complex dietary context. Male Sprague-Dawley rats that underwent either RYGB or sham surgery (Sham) were presurgically and postsurgically given 8-days free access to four semisolid foods representative of different fat and sugar levels along with standard chow and water. Compared with Sham rats, RYGB rats took proportionally fewer calories from fat and more calories from carbohydrates; the latter was not attributable to an increase in sugar intake. The proportion of calories taken from protein after RYGB also increased slightly. Importantly, these postsurgical macronutrient caloric intake changes in the RYGB rats were progressive, making it unlikely that the surgery had an immediate impact on the hedonic evaluation of the foods and strongly suggesting that learning is influencing the food choices. Indeed, despite these dietary shifts, RYGB, as well as Sham, rats continued to select the majority of their calories from the high-fat/high-sugar option. Apparently after RYGB, rats can progressively regulate their intake and selection of complex foods to achieve a seemingly healthier macronutrient dietary composition. Copyright © 2016 the American Physiological Society.

  8. Influence of cafeteria diet and fish oil in pregnancy and lactation on pups' body weight and fatty acid profiles in rats.

    Science.gov (United States)

    Sánchez-Blanco, Clara; Amusquivar, Encarnación; Bispo, Kenia; Herrera, Emilio

    2016-06-01

    The aim was to determine the effects of cafeteria diet (CD) and fish oil supplements given to pregnant and lactating rats on the birth weight and fatty acid profiles of their offspring. Female rats were given standard diet (STD) or CD for 22 days before pregnancy. After mating, some animals remained on STD or CD; for some CD rats, the diet was supplemented with 8.78 % fish oil (CD-FO). After 12 days, half the CD-FO group returned to CD (CD-FO12) and the others remained on CD-FO. At birth, body weights of pups of the three CD groups were lower than STD, maintained until 21 days in the CD-FO group only. At the end of lactation, dams of the CD groups had increased plasma triacylglycerols (TAG), non-esterified fatty acids, and glycerol concentrations, whereas most n-6 long-chain polyunsaturated fatty acids (LCPUFA) were decreased, the effect being greatest in the CD-FO group, where most n-3 LCPUFA were increased and indices of Δ(5) and Δ(6) desaturase activities decreased. The 21-day-old pups of the CD group had increased plasma TAG, not present in the CD-FO group, which had increased 3-hydroxybutyrate concentrations. In both 2- and 21-day-old CD pups, plasma concentrations of ARA were lower than STD, and even lower in the two CD-FO groups. The effect of CD and CD-FO decreasing pups body weight could be related to decreased concentrations of ARA, caused by the inhibition of the Δ(5) and Δ(6) desaturases in the pathway of n-6 LCPUFA biosynthesis.

  9. Prevalence of intestinal parasites, salmonella and shigella among apparently health food handlers of Addis Ababa University student's cafeteria, Addis Ababa, Ethiopia.

    Science.gov (United States)

    Aklilu, Addis; Kahase, Daniel; Dessalegn, Mekonnen; Tarekegn, Negatu; Gebremichael, Saba; Zenebe, Seyfe; Desta, Kassu; Mulugeta, Gebru; Mamuye, Yeshiwodim; Mama, Mohammedaman

    2015-01-24

    Food contamination may occur at any point during its journey through production, processing, distribution, and preparation. The risk of food getting contaminated depends largely on the health status of the food handlers, their personal hygiene, knowledge and practice of food hygiene. Food borne diseases are a public health problem in developed and developing countries like Ethiopia. A cross sectional study was conducted among food handlers in Addis Ababa student's cafeteria from January to May 2013. Structured questionnaire was used to collect socio demographic data and associated risk factors. Stool specimens were examined for bacteria and intestinal parasites following standard procedures. Biochemical tests were done to identify the species of bacterial isolates. Sensitivity testing was done using Kirby- Baur disk diffusion method. A total of 172 food handlers were enrolled in the study. The majority of study participants were females 134 (77.9%). About 78 (45.3%) of food handlers were found to be positive for different intestinal parasites with the most abundant parasite of Entameoba histolytica/dispar 68 (70.8%) followed by Giardia lamblia 18 (18.8%), Taenia species 5 (5.2%), Ascaris lumbricoides 2 (2.1%), hookworm 2 (2.1%) and Trichuris trichiura 1 (1.1%). Stool cultures revealed 3.5% of Salmonella isolates (Sero-grouping on Salmonella isolate was not done), while Shigella species was not isolated from any of the stool samples obtained from Food handlers. All isolates of Salmonella were sensitive to ciprofloxacin, amikacin and gentamicin but resistant to ampicillin, clindamycin, and erythromycin. The present study revealed a high prevalence of intestinal parasite in asymptomatic (apparently health) food handlers. Such infected food handlers can contaminate food, drinks and could serve as source of infection to consumers via food chain.

  10. Evidences of Basal Lactate Production in the Main White Adipose Tissue Sites of Rats. Effects of Sex and a Cafeteria Diet

    Science.gov (United States)

    Arriarán, Sofía; Agnelli, Silvia; Sabater, David; Remesar, Xavier; Fernández-López, José Antonio; Alemany, Marià

    2015-01-01

    Female and male adult Wistar rats were fed standard chow or a simplified cafeteria diet for one month. Then, the rats were killed and the white adipose tissue (WAT) in four sites: perigonadal, retroperitoneal, mesenteric and subcutaneous (inguinal) were sampled and frozen. The complete WAT weight in each site was measured. Gene expression analysis of key lipid and glucose metabolism enzymes were analyzed, as well as tissue and plasma lactate and the activity of lactate dehydrogenase. Lactate gradients between WAT and plasma were estimated. The influence of sex and diet (and indirectly WAT mass) on lactate levels and their relationships with lactate dehydrogenase activity and gene expressions were also measured. A main conclusion is the high production of lactate by WAT, practically irrespective of site, diet or sex. Lactate production is a direct correlate of lactate dehydrogenase activity in the tissue. Furthermore, lactate dehydrogenase activity is again directly correlated with the expression of the genes Ldha and Ldhb for this enzyme. In sum, the ability to produce lactate by WAT is not directly dependent of WAT metabolic state. We postulate that, in WAT, a main function of the lactate dehydrogenase path may be that of converting excess available glucose to 3C fragments, as a way to limit tissue self-utilization as substrate, to help control glycaemia and/or providing short chain substrates for use as energy source elsewhere. More information must be gathered before a conclusive role of WAT in the control of glycaemia, and the full existence of a renewed glucose-lactate-fatty acid cycle is definitely established. PMID:25741703

  11. Modern 'junk food' and minimally-processed 'natural food' cafeteria diets alter the response to sweet taste but do not impair flavor-nutrient learning in rats.

    Science.gov (United States)

    Palframan, Kristen M; Myers, Kevin P

    2016-04-01

    Animals learn to prefer and increase consumption of flavors paired with postingestive nutrient sensing. Analogous effects have been difficult to observe in human studies. One possibility is experience with the modern, processed diet impairs learning. Food processing manipulates flavor, texture, sweetness, and nutrition, obscuring ordinary correspondences between sensory cues and postingestive consequences. Over time, a diet of these processed 'junk' foods may impair flavor-nutrient learning. This 'flavor-confusion' hypothesis was tested by providing rats long-term exposure to cafeteria diets of unusual breadth (2 or 3 foods per day, 96 different foods over 3 months, plus ad libitum chow). One group was fed processed foods (PF) with added sugars/fats and manipulated flavors, to mimic the sensory-nutrient properties of the modern processed diet. Another group was fed only 'natural' foods (NF) meaning minimally-processed foods without manipulated flavors or added sugars/fats (e.g., fresh fruits, vegetables, whole grains) ostensibly preserving the ordinary correspondence between flavors and nutrition. A CON group was fed chow only. In subsequent tests of flavor-nutrient learning, PF and NF rats consistently acquired strong preferences for novel nutrient-paired flavors and PF rats exhibited enhanced learned acceptance, contradicting the 'flavor-confusion' hypothesis. An unexpected finding was PF and NF diets both caused lasting reduction in ad lib sweet solution intake. Groups did not differ in reinforcing value of sugar in a progressive ratio task. In lick microstructure analysis the NF group paradoxically showed increased sucrose palatability relative to PF and CON, suggesting the diets have different effects on sweet taste evaluation. Copyright © 2016 Elsevier Inc. All rights reserved.

  12. Patrones de diseño para mejorar la accesibilidad y uso de aplicaciones sociales para adultos mayores

    Directory of Open Access Journals (Sweden)

    Huizilopoztli Luna García

    2015-07-01

    Full Text Available El objetivo de este artículo fue proponer una colección no exhaustiva de 36 patrones para el diseño de interacciones en aplicaciones sociales para adultos mayores. La propuesta representa un punto de partida confiable para facilitar, a diseñadores/desarrolladores, la integración de usabilidad en las interfaces de estas tecnologías con el fin de fomentar su aceptación, uso y adopción entre los adultos mayores. Esta propuesta se basa en esfuerzos previos comúnmente expresados como criterios y guías de diseño para definir los posibles problemas de usabilidad en este tipo de interfaces, y se concentra en reforzar estos enfoques mediante la integración de una mayor descripción de tales anomalías y alternativas de solución bajo una estructura de patrones útil para los diseñadores/desarrolladores. Se realizó un estudio de usabilidad con la técnica «evaluación heurística» (comúnmente utilizada en interacción hombre-máquina para obtener la percepción de los usuarios sobre un diseño particular. El trabajo se llevó a cabo desde dos perspectivas: el punto de vista de expertos técnicos y la percepción de un grupo social de adultos mayores. Los resultados reflejaron que los patrones propuestos propician la creación de interfaces bien diseñadas capaces de ofrecer una mejor experiencia de uso y promueven un impacto positivo en la calidad de vida de los adultos mayores.

  13. Arcillas cerámicas: una revisión de sus distintos tipos, significados y aplicaciones

    Directory of Open Access Journals (Sweden)

    Díaz Rodríguez, L. A.

    2002-10-01

    Full Text Available Clay is a word which has many meanings depending on the use to which it is put. However, it is in the ceramic field where the application of clay began and so it is here where this work will try to find a definition and establish a classification based on ceramic-geological criteria. The different kinds of clays found in Nature and their mineralogy are discussed in detail. Their properties and main uses are pointed out and finally the geographical and geological distribution of Spanish clays which have ceramic applications is presented.

    La palabra arcilla posee un significado muy distinto según sea el ámbito industrial o científico de su utilización. Aunque hoy en día las aplicaciones de las materias primas arcillosas son muy variadas, es en el ámbito cerámico donde reside el primer origen de su consumo. Por tanto, es aquí donde se ha centrado este trabajo para exponer, en primer lugar, una definición del concepto arcilla y, con posterioridad, establecer una clasificación de las arcillas según criterios cerámico-geológicos. Se describen los distintos tipos existentes en la Naturaleza y se hace mención a su mineralogía, propiedades en general y usos principales. Finalmente, se exponen las arcillas españolas de aplicación cerámica, y su distribución dentro del territorio español.

  14. Aplicaciones clínicas de la colangiopancreatografía por resonancia magnética

    Directory of Open Access Journals (Sweden)

    Mirian Natalia Herrera Toro

    2005-02-01

    Full Text Available La colangiopancreatografía por resonancia magnética (CPRM es la alternativa diagnóstica más importante que ha surgido en los últimos años para la evaluación de las vías biliar y pancreática. Las ventajas de este método son: no utiliza medio de contraste ni radiación ionizante, no es invasivo, está exento de complicaciones y el tiempo de estudio es relativamente corto (aproximadamente 20 a 30 minutos. Tiene altas sensibilidad y especificidad para diagnosticar la dilatación biliar y para demostrar el sitio y la causa de la estenosis. Para los cálculos biliares y pancreáticos su exactitud diagnóstica es similar a la de la colangiopancreatografía endoscópica retrógrada (CPER. En variantes anatómicas biliopancreáticas ha reemplazado a la CPER como método diagnóstico. En la CPER fallida, la CPRM es casi la única modalidad diagnóstica para la evaluación de los conductos biliares. Otra aplicación más reciente es la colangitis esclerosante primaria para cuyo diagnóstico tiene algunas ventajas sobre la CPER. Este artículo es una revisión de las aplicaciones clínicas de la CPRM en la evaluación de las enfermedades biliopancreáticas.

  15. Development and application of a methodology for the classification of the operating conditions of power transformers; Desarrollo y aplicacion de una metodologia para la clasificacion del estado operativo de transformadores de potencia

    Energy Technology Data Exchange (ETDEWEB)

    Lara Covarrubias, Hector

    2004-05-15

    Electricidad (CFE). Se asignan tres estados de semaforizacion (verde, amarillo y rojo) para cada paso relativo y de acuerdo a los resultados de prueba se le asignara un paso relativo (1, 2 o 3). Asignacion de pesos especificos a cada una de las pruebas consideradas en el modelo. Determinacion del producto del vapor relativo para su peso especifico para cada prueba, obteniendo un puntaje para cada una de las pruebas. Obtencion del grado de riesgo del transformador bajo evaluacion mediante un calculo de puntaje final, es decir, la sumatoria de los puntajes individuales de cada prueba. Definicion de tres categorias para la clarificacion del grado de riesgo de transformadores de acuerdo a sus puntajes finales. Clasificacion del estado operativo de los transformadores evaluados de acuerdo al puntaje obtenido, el cual se ubica en una de las tres categorias definidas. Con la semaforizacion se priorizan las recomendaciones pertinentes. Con la aplicacion del modelo para la clasificacion del estado operativo de los transformadores de potencia, se puede programar mantenimiento de acuerdo al grado de riesgo. El modelo desarrollado puede ser aplicado a todo el parque de transformacion de la CFE, permitiendo con esto programar la inversion para la situacion, previniendo fallas catastroficas que pueden ocasionar problemas de logistica y economicos a la operacion del sistema electrico nacional de potencia. Como ejemplo, se analizan los resultados de la aplicacion del modelo en 2 bancos de transformacion instalados en la Central Hidroelectrica Malpaso.

  16. Possible uses and applications of drones in a nuclear power plant; Posibles usos y aplicaciones de los drones en una central nuclear

    Energy Technology Data Exchange (ETDEWEB)

    Celis del A, L.; Palacios, J.; Rivero, T.; Valero, D., E-mail: lina.celis@inin.gob.mx [ININ, Carretera Mexico-Toluca s/n, 52750 Ocoyoacac, Estado de Mexico (Mexico)

    2016-09-15

    The versatility of drones is one of the strengths that have led to the rapid development of this technology, as they adapt relatively easily to new applications, presenting considerable advantages such as greater energy efficiency, longer life and a significant lower operation cost than manned systems. The current applications of the drones, in addition to the military, are very wide and varied. The nuclear industry represents an important area of opportunity for drones, mainly in response to radiological emergencies, since in this case there is a latent risk of the general population being exposed to high radiation doses. Drones can be used in environments with high chemical and radiological toxicity without endangering human lives. Some of the possible applications of the drones in a nuclear power plant are: perimeter surveillance in physical security, where equipped with a high definition camera can be used as support to physical security systems in general; visual inspection at sites, structures, equipment and pipelines, etc., as part of preventive maintenance in order to avoid the loss of material due to corrosion, oxidation, cracking, subsidence; the visual inspection through thermo-graphic images to be able to detect hot spots in some critical element; measurement and radiological mapping on surfaces to maintain monitoring of radiological safety at nuclear power plant facilities; the monitoring of environmental parameters and the Environmental Impact Assessment to obtain important information to determine the environmental impact of a given area; and accident support by providing information that allows staff to size the magnitude of the damage. (Author)

  17. Explorando luz solar en modelos de desarrollo inmobiliario. Aplicaciones en cinco ciudades chilenas.

    Directory of Open Access Journals (Sweden)

    Luz Alicia Cárdenas Jirón

    2016-06-01

    Full Text Available El explosivo crecimiento del stock edificado de los últimos años en las ciudades chilenas se ha visto reflejado en concentraciones inmobiliarias de gran altura, que irrumpen estrepitosamente en la morfología de las ciudades chilenas. Externalidades son observadas en los espacios y edificios vecinos tales como extensas áreas de sombreamiento que afectan las condiciones térmicas y lumínicas. Estas construcciones se realizan aparentemente acordes a la norma urbanística, pero afectan la luz solar incidente en fachadas y suelos, disminuyendo las posibilidades de captación y su uso como energía renovable. El objetivo del presente artículo es explorar mediante modelos espaciales –energéticos, distintas formas de ocupación de suelo, cambiando la altura edificada, pero manteniendo la constructibilidad en cinco ciudades chilenas. Las ciudades seleccionadas se sitúan en el centro sur de Chile, emplazadas tanto en el borde costero como el valle central y han presentado crecimientos inmobiliarios importantes en los últimos años. Los resultados muestran valores de energía más elevados en configuraciones de mayor altura, y menores valores relativos a medida que asciende latitudinalmente. El modelo básico ha sido una manzana de 1 ha como punto de partida, por tanto los resultados no son aplicables a un tejido urbano que es más complejo.

  18. La web, las aplicaciones de las Matemáticas y las metodologías activas: Una propuesta para el aula

    Directory of Open Access Journals (Sweden)

    María José Pérez Peñalver

    2013-04-01

    Full Text Available Con el objetivo de implicar a los estudiantes en su aprendizaje y de que relacionen los contenidos que se imparten en las clases de matemáticas, se ha creado una pequeña práctica de aula en primero de Ingeniería Civil de la Universidad Politécnica de Valencia. En la tarea, los estudiantes investigan en grupo las aplicaciones de las cónicas y las cuádricas a través de la red. Posteriormente eligen varias aplicaciones y elaboran una pequeña presentación que comparten con el resto de grupos. Finalmente realizan la evaluación de la tarea, que ha sido una responsabilidad compartida entre el profesor y los grupos y se ha organizado en forma de concurso con un premio para el mejor. En el artículo se muestra la descripción detallada del proceso, los resultados obtenidos, el grado de satisfacción de los alumnos y del docente, los problemas que surgieron y las propuestas de mejora.

  19. Gas turbine application in power plants of Mexican refineries; Aplicacion de turbinas de gas en plantas de fuerza de refinerias mexicanas

    Energy Technology Data Exchange (ETDEWEB)

    Alcaraz Calderon, A. M.; Rodriguez Martinez, H.; Garcia Paredes, Job; Morales Guillen, Magdalena; Manzanares Papayanapolous, Emilio [Instituto de Investigaciones Electricas, Cuernavaca, Morelos (Mexico)]. E-mail: malcaraz@iie.org.mx; jhrm@iie.org.mx; jgarcia@iie.org.mx; mmmg@iie.org.mx; emp@iie.org.mx

    2010-11-15

    This article presents an overview of the application to have the gas turbine power generation systems, electric and steam for Mexican refineries. First there is a general description of the gas turbines and heat recovery (system components CHP) and CHP schemes are based on gas turbines capable of use in Mexican refineries. Subsequently referred to the characteristics of energy consumption (steam and electricity) from Mexican refineries and performs a technical analysis of CHP schemes based on gas turbines from the point of view of rates Q/W, power efficiencies and combined concluded that by their nature are very useful for refinery and gives some recommendations for improved implementation. [Spanish] En este articulo se presenta una vision general de la aplicacion que tienen las turbinas de gas en sistemas de generacion de energia electrica y vapor para refinerias mexicanas. Primeramente se da una descripcion general de las turbinas de gas y recuperadores de calor (componentes principales del sistema de cogeneracion) y se muestran los esquemas de cogeneracion basados en turbinas de gas susceptibles de utilizar en refinerias mexicanas. Posteriormente se mencionan las caracteristicas de consumos energeticos (vapor y energia electrica) de las refinerias mexicanas y se realiza un analisis tecnico de los esquemas de cogeneracion basado en turbinas de gas desde el punto de vista de tasas Q/W, eficiencias electricas y combinadas, concluyendose que por sus caracteristicas son muy utiles para refinerias y se dan algunas recomendaciones para su mejor aplicacion.

  20. La Seguridad en Internet de las Cosas: Analizando el Tráfico de Información en Aplicaciones para iOS

    Directory of Open Access Journals (Sweden)

    Juan-Manuel Martínez

    2017-05-01

    Full Text Available En los últimos años se ha observado un gran avance tecnológico y el servicio de Internet no es la excepción (en México el servicio doméstico básico es 180 veces más rápido que hace 15 años. Esto ha permitido conectar cada vez más dispositivos, surgiendo así el Internet de las cosas (IoT. De esta manera, el número de dispositivos conectados ha alcanzado una cifra aproximada de 20 mil millones, y se espera que para 2020 llegue a 50 mil millones. Esto ha generado grandes retos para mantener la seguridad y privacidad de la información ya que la mayoría de los dispositivos de IoT se centran en la conectividad y están incluyendo configuraciones por defecto donde la seguridad se ve gravemente afectada. Este artículo presenta los resultados del análisis de tráfico realizado a diversas aplicaciones para iOS, con el objetivo de informar lo fácil que puede ser capturar el tráfico, aunque se utilice el protocolo https y que aún existen muchas aplicaciones que transmiten información sin cifrar.

  1. Efecto del calcio en aplicaciones precosecha y poscosecha sobre la severidad de antracnosis (Colletotrichum gloeosporioides y la calidad de frutos de papaya (Carica papaya

    Directory of Open Access Journals (Sweden)

    Daniel Saborío

    2000-01-01

    Full Text Available Se evalu6 el efecto de aplicaciones pre- cosecha y poscosecha de calcio en papaya va- riedad "criolla" sabre la severidad de antracno- sis (CoUetotrichum gloeosporioides y varia- hIes de calidad del fruto. Los tratamientos pre- cosecha fueron 4: aspersi6n de CaCl2 al 1% Y 4% (2 aplicaciones: <40 dfas posantesis (dpa y entre 100-140 dpa con el penetrante alquilaril- polimero (NP- 7 Bayer (0.4 mIlL, CaCO3 al suelo (1 ton/ha, 70 dpa y testigo (0% Ca. El diseno experimental fue un BCA (4 repeticio- nes de 20 frutos. Los tratamientos poscosecha fueron 3: inmersiones par 5 min con 0%, 1 % Y 4% de CaCI2, con el mismo penetrante. El dise- no experimental fue un BCA (3 repeticiones de 15 frutas. Se evalu6 severidad, % calcio en cascara, brix, pH, % acidez, firmeza (cascara y pulpa y % de madurez. En la aplicaci6n de cal- cia precosecha la severidad fue: 1 % CaC12 con 6%, testigo 7%, CaCO3 9% y 4% CaC12 con 11 %, no se encontr6 que el Ca tuviera un efec-

  2. The photo refractive polymers, physics and photonic applications of these new materials; Los polimeros fotorrefractivos, fisica y aplicaciones fotonicas de estos nuevos materiales

    Energy Technology Data Exchange (ETDEWEB)

    Maldonado, J. L. [Centro de Investigacion en Optica, Leon, Guanajuato (Mexico); Garcia M, J. [Universidad Nacional Autonoma de Mexico, Mexico, D.F. (Mexico)

    2001-12-01

    This paper is a review about the new photo refractive organic materials and their potential photonic applications, the photo refractive polymers. The physical properties required for observing photo refractivity, including charge generation, transport, and nonlinear optical properties are discussed for amorphous polymers. The nonlinear optical properties on a macroscopic level are related to the microscopic properties by using the Oriented Gas model. Four Wave Mixing (FWM) and Two Beam Coupling (TBC) experiments, to investigate the photo refractive properties of the material by measuring the diffraction efficiency {eta} of the polymeric gratings, and the optical gain coefficient {eta} are described. Kogelnik's Coupled Wave model to describe the photo refractive polymeric gratings is reviewed. Finally some applications of these new polymers are presented. [Spanish] Este articulo es una revision sobre los nuevos materiales organicos fotorrrefractivos y sus potenciales aplicaciones fotonicas: los polimeros fotorrefractivos. Se discuten las propiedades fisicas requeridas para observar fotorrefractividad, incluyendo la generacion de cargas, el transporte y las propiedades opticas no lineales en polimeros amorfos. Usando el modelo de gas orientado, se muestra como se relacionan las propiedades opticas no lineales a nivel marcoscopico con las propiedades microscopicas. Se describen los experimentos de mezcla de cuatro ondas (FWM) y dos ondas (TBC) para investigar las propiedades fotorrefractivas del material, midiendo la eficiencia de difraccion {eta} de las rejillas polimericas y el coeficiente de ganancia optica {eta}. Se revisa el modelo de ondas acopladas de Kogelnik para describir las rejillas polimericas fotorrefractivas. Finalmente se presentan algunas aplicaciones de estos nuevos polimeros.

  3. Simulación de Plataformas Robóticas de Movimiento para Aplicaciones de Realidad Virtual Mediante Filtros Digitales

    Directory of Open Access Journals (Sweden)

    Sergio Casas

    2017-10-01

    Full Text Available Resumen: El uso de plataformas robóticas de movimiento en simuladores de vehículos y aplicaciones de Realidad Virtual es relativamente habitual. Sin embargo, el ajuste de los algoritmos que controlan su funcionamiento, denominados algoritmos de washout, no es sencillo y requiere de numerosas pruebas hasta obtener una apropiada fidelidad de movimiento. Disponer de herramientas que permitan simular plataformas de movimiento puede permitir simplificar esta tarea. Es por ello que este trabajo presenta un método para la caracterización y simulación de manipuladores robóticos mediante filtros digitales de segundo orden, sencillo de implementar y ajustar a partir de una caracterización previa. El simulador se construye con el objetivo de permitir la simulación rápida de manipuladores robóticos y se ejemplifica con una plataforma de dos grados de libertad, aunque el método propuesto podría emplearse en otros dispositivos. En las pruebas realizadas se valida la precisión y velocidad de la simulación, concluyéndose que se obtiene una fidelidad satisfactoria y una velocidad de simulación elevada que permite emplear el simulador como sustituto del hardware real con algoritmos de washout. Abstract: Robotic motion platforms are used in many vehicle simulators and Virtual Reality applications. However, the set-up of the so-called washout algorithms that control the generation of self-motion is a hard process, since a great deal of tests need to be performed before reaching a proper motion fidelity. The availability of simulation tools eases this tuning task. Therefore, a motion platform characterization and simulation method is proposed in this paper. The method relies on second order digital filters and provides a reliable, yet very fast simulation system, which is assessed by means of a two degree-of-freedom motion platform, although the method might be applied to simulate other motion mechanisms. Palabras clave: Plataformas de movimiento

  4. Application of a Lagrangian modeling to the atmospheric pollution; Aplicacion de una modelizacion Lagrangiana a la contaminacion atmosferica transfronteriza

    Energy Technology Data Exchange (ETDEWEB)

    Rua, A.; Hernandez, E. [Departamento de Fisica del Aire, Universidad Complutense de Madrid, Facultad de Ciencias Fisicas, Madrid (Spain); Gimeno, L. [Centro de Formacion del Instituto Nacional de Meteorologia (INM), Madrid (Spain)

    1998-04-01

    contaminantes modelizados fueron el SO{sub 2} y el SO{sub 4}{sup 2}-. La estacion elegida para la aplicacion de esta modelizacion fue Lgrono (Espana).

  5. Applications of the Preclinical Molecular Image in Biomedicine; Aplicaciones de la imagen Molecular Preclínica en Biomedicina

    Energy Technology Data Exchange (ETDEWEB)

    Delgado, M.; Bascuñana, P.; Fernández de la Rosa, R.; De Cristobal, J.; García-García, L.; Pozo, M.A.

    2014-07-01

    efecto de fármacos terapéuticos en estudios longitudinales por medio de técnicas de imagen molecular. El objetivo de la presente revisión es resumir los principios y los hallazgos más recientes en la imagen molecular mediante PET, y su aplicación preclínica en investigación oncológica. Se resaltaran las bases teóricas de la técnica y las principales aplicaciones.

  6. Procesamientos GNSS en línea como potenciales alternativas a diferentes aplicaciones geodésicas

    Directory of Open Access Journals (Sweden)

    Jorge Moya-Zamora

    2015-07-01

    Full Text Available En este estudio se hace una descripción en cuanto a utilización, capacidad de procesamiento, tipos de archivos y resultados, de una serie de programas en línea para la elaboración de datos de GNSS. En la actualidad la información que se puede obtener de los sistemas GNSS, permite una muy variada cantidad de aplicaciones, desde la navegación de vehículos hasta diferentes estudios relacionados con la dinámica terrestre. Las posibilidades de uso en la geodesia dependen exclusivamente de la alta exactitud que se puede obtener al hacer un procesamiento de los datos GNSS con programas científicos como Bernese o GAMIT y con un trabajo relativo o diferencial. Sin embargo, se han desarrollado una serie de programas disponibles en internet que brindan una opción muy adecuada para obtener, en muy corto tiempo soluciones con una exactitud aceptable para muchas tareas relacionadas con la cartografía, la topografía y el catastro y la geodesia. Algunos de estos programas se basan en la técnica de Posicionamiento Puntual Preciso (Precise Point Positioning PPP. El estudio comparativo realizado contempló una serie de archivos de observación en formato rinex que fueron procesados con los programas en línea APPS, CSRS, AUSPOS, OPUS y SCOUT. Los resultados obtenidos se analizaron en comparación con ellos mismos, con posiciones de alta exactitud dadas por Sistema de Referencia Geocéntrico para las Américas (SIRGAS en la estación ETCG, además de contemplar, diferentes archivos de órbitas satelitales y los errores propios del procesamiento en línea. En lo que respecta a la concordancia de las soluciones en línea con el marco internacional de referencia se cuantificaron valores menores a 20 mm en la parte horizontal.

  7. Discover knowledge in databases: Mining of data and applications; Descubrir conocimiento en bases de datos: Mineria de datos y aplicaciones

    Energy Technology Data Exchange (ETDEWEB)

    Rodriguez Martinez, Andres F [Instituto de Investigaciones Electricas, Temixco, Morelos (Mexico); Morales Manzanares, Eduardo [Instituto Tecnologico de Estudios Superiores de Monterrey (ITESM), Campus Cuernavaca, Morelos (Mexico)

    2000-07-01

    general y el concepto de mineria de datos en particular; establecer la relacion que existe entre el proceso de descubrir conocimiento en bases de datos y la mineria de los datos; asi como fijar las caracteristicas y complejidades de buscar patrones utiles en los datos. Tambien se describen los principales metodos de mineria de datos y las areas de aplicacion donde estos algoritmos han tenido mayor exito.

  8. Rol del fallo mecánico en la optimización del mantenimiento en una central nuclear//Role of the mechanical failure during the maintenance optimization in the nuclear power plant

    OpenAIRE

    Antonio Torres-Valle

    2012-01-01

    Entre las más recientes aplicaciones del Análisis Probabilista de Seguridad (1997 – 2003) de la Central Nuclear Embalse en Argentina, está el Programa de Mantenimiento Orientado a la Seguridad (2006– 2009) el cual se ha desarrollado con el empleo de la metodología de Mantenimiento Centrado en la Confiabilidad (RCM en inglés). El objetivo general del artículo es demostrar la alta contribución de los fallos mecánicos en el diseño de las políticas de mantenimiento de varios sistemas de la instal...

  9. INTEGRACIÓN DE APLICACIONES OPEN SOURCE Y PROTOCOLOS DE RED PARA UN SISTEMA DE RECUPERACIÓN AUTOMÁTICO DE SERVIDORES

    Directory of Open Access Journals (Sweden)

    Richard Lobo

    2015-07-01

    Full Text Available En una red coexisten diversos dispositivos de comunicación tales como switch (conmutadores, routers (enrutadores, firewall y los servidores; estos últimos garantizan el funcionamiento de los servicios de una red que son instalados por los administradores de redes, utilizando para ello un elevado número de herramientas y requiriendo un elevado grado de especialización para su correcta configuración. Cuando surge un problema en los servicios, la detección, diagnóstico y posterior solución dependerán de la disponibilidad de los encargados de administrar la red de datos, solución que podría tardar algún tiempo. Si algunos de estos servicios dejan de funcionar, traería como consecuencia la inoperatividad del servicio prestado, provocando el descontento de los usuarios. En el presente artículo, se desarrolla un sistema de recuperación automático de servidores (SIRAS realizando reinstalación remota y desatendida para el mejoramiento de los servicios de la Red de Datos del Rectorado la Universidad de los Andes (ULA Mérida, Venezuela. Para ello, se utilizan varias aplicaciones tales como sistemas de archivos remotos, protocolos de autoconfiguración de red, protocolo de transferencia de archivos, entre otros, que ayudan a optimizar los servicios de las redes en cuestión, sobre la infraestructura ya existente. Los datos se recolectaron directamente del lugar donde ocurren los hechos. Los resultados indican un comportamiento estable tanto para GNU/Linux en la interconexión de las aplicaciones, como para las comunicaciones en red, independientemente del sistema operativo utilizado. Además, el sistema SIRAS permitió mejorar los servicios de la red. Asimismo, se demostró que el hardware que aloja al sistema de recuperación no se vio afectado en su rendimiento al momento de la ejecución simultánea de todas las aplicaciones y protocolos de red que intervinieron en el sistema.

  10. Central Diabetes Insipidus, Central Hypothyroidism, Renal Tubular ...

    African Journals Online (AJOL)

    diseases, primary hypothyroidism, and other disorders of the central nervous, gastrointestinal, genitourinary, and orthopedic systems. In this report, we describe a 3‑month‑old Saudi boy with the rare association of DWS with central diabetes insipidus, congenital central hypothyroidism, and type‑2 renal tubular acidosis.

  11. I concurso de aplicaciones móviles en Firefox OS de la Fundación Telefónica

    OpenAIRE

    Fundación Telefónica

    2013-01-01

    Este concurso pretende impulsar las habilidades de los jóvenes en el entorno de la cultura digital, así como fomentar la innovación y sus competencias digitales. Se han presentado 600 jóvenes con ideas innovadoras para el nuevo sistema operativo Firefox Os desarrollado por Telefónica y la Fundación Mozilla. Ocho jóvenes han sido los ganadores de la I Edición de los Premios APPS Fundación Telefónica, un concurso destinado a chicos y chicas de entre 18 y 25 años, para crear aplicaciones móviles...

  12. Algumas aplicaciones del método cluster a la organización de la producción en talleres de tratamiento térmico

    Directory of Open Access Journals (Sweden)

    Roberto Cespón Castro

    1994-06-01

    Full Text Available El trabajo expone algunas aplicaciones del método CLUSTER a la solución de problemas que se presentan en los talleres y secciones de tratamiento térmico, enfatizándose en las cuestiones relacionadas con el agrupamiento de piezas y la formación de células flexibles de fabricación, lo cual constituye la base para la introducción de todo un conjunto de técnicas y criterios de avanzada en la actividad productiva de estas instalaciones.This work deals with some applications of CLUSTER method for problem-solving in heat treatment workshoops and sections. The main aspects related to parts grouping and manufacturing flexible cells building are explained, as a basis for implementing a set of tools and advanced criteria to manufacturing activities at these facilities.

  13. Las Tecnologías de la Información y las Comunicaciones y su impacto en las aplicaciones sociales

    OpenAIRE

    Luque, Emilio

    2015-01-01

    En este análisis del impacto de las Tecnologías de la Información y las Comunicaciones (TIC) en aplicaciones sociales, nos vamos a centrar en su aplicación actual y su evolución en el ámbito de la salud. La adopción de las tecnologías TIC en el ámbito de la salud es un hecho imparable que nos conduce a escenarios hasta ahora no imaginados y que supondrá tanto la evolución de la medicina, como la creación de nuevos avances tecnológicos de las TIC. Hay dos componentes tecnológicos fundamentales...

  14. Análisis de la detección de colisiones en un entorno virtual para aplicaciones hápticas de asistencia quirúrgica

    Directory of Open Access Journals (Sweden)

    María Luisa Pinto Salamanca

    2011-01-01

    Con base en los resultados de algunos trabajos relacionados con la obtención, procesamiento y análisis de imágenes para la construcción de modelos, se desarrollan aplicaciones hápticas de interacción con sólidos rígidos de interés médico, que incluyen herramientas para la marcación de puntos y trayectorias sobre una superficie, y un algoritmo de reflexión de fuerzas para la simulación de interacción con órganos modelados por medio de técnicas hibridas (renderizado superficial y volumétrico. Se hace especial énfasis en la representación de los instrumentos virtuales quirúrgicos, integrando herramientas con geometría 3D.

  15. Central Nervous System Vasculitis

    Science.gov (United States)

    ... Forms of Vasculitis / Central Nervous System (CNS) Vasculitis Central Nervous System (CNS) Vasculitis Swap out your current Facebook Profile ... your Facebook personal page. Replace with this image. Central nervous system (CNS) vasculitis is inflammation of blood vessel walls ...

  16. Aplicaciones de aluminio mantienen el crecimiento de fresa (Fragaria × ananassa Duch. suplementada con roca fosfórica en condiciones de cultivo sin suelo

    Directory of Open Access Journals (Sweden)

    Martín Alejandro Tucuch Pérez

    2017-07-01

    Full Text Available Se estima que en los próximos años a nivel mundial habrá carencia de las fuentes de fósforo (P utilizadas para fabricar los fertilizantes fosforados. Aunque el P puede encontrarse en el suelo, la mayor parte se encuentra en forma no asimilable por las plantas, por lo que para absorberlo éstas exudan ácidos orgánicos (AO para facilitar su solubilización. Por otro lado, se ha reportado que la presencia de aluminio (Al se relaciona con un aumento en la exudación de AO por la raíz. Dado la capacidad solubilizadora de los AO, en el presente estudio se planteó evaluar el efecto de la aplicación de Al sobre la exudación de AO y el uso de P en forma no soluble (roca fosfórica, RF en el crecimiento y rendimiento de plantas de fresa. El experimento constó de ocho tratamientos que resultaron de combinar dos cantidades de RF, mezcladas en el sustrato, con aplicaciones de Al. Los tratamientos con RF se irrigaron con una solución que contenía 0.25 meq L‑1 H2PO4‑. Los resultados mostraron que con aplicaciones de Al vía riego se obtienen mayores rendimientos, hasta 380 g planta-1, lo cual estuvo correlacionado positivamente con la concentración de ácido cítrico y negativamente con la concentración de ácido málico en el sustrato. Se concluye que el citrato exudado por la raíz debido a la aplicación de Al, favorece el rendimiento de plantas de fresa cuando el P se encuentra en forma de RF.

  17. Fermentation Tecniques and Applications of Bacterial Cellulose: a Review Técnicas de fermentación y aplicaciones de la celulosa bacteriana: una revisión

    Directory of Open Access Journals (Sweden)

    Luz Dary Carreño Pineda

    2012-12-01

    Full Text Available Bacterial cellulose is a polymer obtained by fermentation with microorganismsfrom Acetobacter, Rhizobium, Agrobacterium and Sarcina genera. Amongthem, Acetobacter xylinum is the most efficient specie. This polymer hasthe same chemical composition of plant cellulose, but its conformation andphysicochemical properties are different, making it attractive for several applications, especially in the areas of food, separation processes, catalysis andhealth, due to its biocompatibility. However, the main problem is the production in mass that is constrained by low yield. It is therefore necessaryto develop some alternatives. This paper presents a review about synthesis,production, properties and principal applications of bacterial cellulose, as wellas some alternatives to reduce the difficulties for process scaling.La celulosa bacteriana es un polímero obtenido por fermentación con microrganismosde los géneros Acetobacter, Rhizobium, Agrobacterium y Sarcina, delas cuales la especie más eficiente es la Acetobacter Xylinum. Este polímero presenta la misma estructura química de la celulosa de origen vegetal, pero difiereen su conformación y propiedades fisicoquímicas, lo que lo hace atractivo para diversas aplicaciones, especialmente en las áreas de alimentos, procesosde separación, catálisis y en medicina, gracias a su biocompatibilidad. Sin embargo, el principal problema es la producción a gran escala limitada por losbajos rendimientos, lo que genera la necesidad de desarrollar alternativas que permitan disminuir o eliminar las causas de esta limitación. En este artículo se hace una revisión acerca de la síntesis, producción, propiedades y principales aplicaciones de la celulosa bacteriana, así como de algunas alternativas estudiadas para disminuir los inconvenientes en el escalamiento del proceso.

  18. Inversor Resonante de Tres Elementos L-LC con Caracteristica Cortocircuitable para Aplicaciones de Calentamiento por Induccion

    Science.gov (United States)

    Espi Huerta, Jose Miguel

    Los generadores de calentamiento por induccion son puentes inversores con carga resonante, cuya mision es basicamente crear una corriente sinusoidal de gran amplitud sobre la "bobina de caldeo", que forma parte del tanque resonante. En el interior de esta bobina se introduce la pieza que se desea calentar. EI campo magnetico creado induce corrientes superficiales (corrientes de Foucault) sobre la pieza, que producen su calentamiento. Los tanques resonantes (tambien llamados osciladores) utilizados en la actualidad son el resonante serie y el resonante paralelo. Aunque ya desde hace algun tiempo se vienen construyendo generadores de alta potencia basados en estos dos osciladores, el exito nunca ha. sido completo en ninguno de los dos casos. Tal y como se explica en la introduccion de esta memoria, los puentes inversores utilizados deben operar sobre una carga inductiva (corriente retrasada) para evitar el fenomeno de la recuperacion inversa de sus diodos y la consiguiente ruptura de los transistores. De la restriccion topologica anterior se deduce que el generador paralelo debe conmutar a frecuencias inferiores a la resonancia, y el serie a frecuencias superiores. A esta restriccion topologica hay que unir otra que es exclusiva del calentamiento por induccion: La corriente por la bobina de caldeo debe ser sinusoidal. De no ser asi, resultaria imposible disponer toda la potencia de calentamiento sobre la pieza en el espesor requerido por la aplicacion. Como consecuencia, los inversores no pueden operar por debajo de la frecuencia de resonancia del oscilador, pues en ese caso se amplifican los armonicos de orden superior de la tension/corriente de entrada situados sobre la resonancia, con la consiguiente distorsion de la corriente de salida. La conjuncion de las dos restricciones anteriores obligan al inversor paralelo a funcionar a la frecuencia de resonancia del oscilador. Esto imposibilita un control por variacion de frecuencia, regulandose la potencia desde la

  19. One Path Through the Cafeteria

    Science.gov (United States)

    Willems, Edwin P.; Campbell, David E.

    1976-01-01

    In this article, the previous four major position papers presented in this journal are evaluated from several vantage points. These include the relationship of concept to process, the study of psychological phenomena with relation to adaptive performance and the problems of measurement of these phenomena. (Author/MA)

  20. Development of a methodology for the economical analysis of fuel cycles, application to the Laguna Verde central; Desarrollo de una metodologia para el analisis economico de ciclos de combustible, aplicacion a la Central Laguna Verde

    Energy Technology Data Exchange (ETDEWEB)

    Malfavon, S.M.; Trejo, M.G.; Hernandez, H. [FI-UNAM, 04500 Mexico D.F. (Mexico); Francois, J.L.; Ortega, R.F. [FI-UNAM, Paseo Cuauhnahuac 8532, Jiutepec, Morelos (Mexico)

    2003-07-01

    In this work a methodology developed to carry out the economical analysis of the fuel cycle of a nuclear reactor is presented. The methodology was applied to the Laguna Verde Nuclear Power Station (CNLV). The design of the reload scenarios of the CNLV are made with the Core Master Presto code (CM-Presto), three-dimensional simulator of the reactor core, the launched data by this, as well as the information of the Energy use plan (PUE), it allowed us to obtain reliable results through the fitness of an algorithm of economic calculation that considers all the components of the fuel cycle to present worth. With the application of the methodology it was obtained the generated energy, as well as their respective cost of each sub lot type of assemblies by operation cycle, from the start-up of the CNLV until September 13, 2002. Using the present worth method its were moved all the values at November 5, 1988, date of operation beginning. To the final of the analysis an even cost of 6.188 mills/kWh was obtained for those first 9 cycles of the Unit 1 of the CNLV, being observed that the costs of those first 3 operation cycles are the more elevated. Considering only the values starting from the cycle 4, the levelled cost turns out to be of 5.96 mills/kWh. It was also obtained the cost by fuel lot to evaluate the performance of assemble with the same physical composition. (Author)

  1. Evaluating interactive digital television applications through usability heuristics Evaluando aplicaciones de televisión digital interactiva a través de heurísticas de usabilidad

    Directory of Open Access Journals (Sweden)

    Andrés Solano

    2013-04-01

    Full Text Available Interactive Digital Television (iDT is considered as the convergence of television and computer technologies. Usability evaluation for applications based on emerging information technology brings new challenges. The main iDT feature is that the user may interact with the application; therefore usability should be a main concern when designing iDT applications. Current research usually focuses on iDT applications from a technical point of view, rather than a user-centered approach. There is a need for new usability evaluation methods or at least for the use of traditional evaluations in novel ways. A set of specific usability heuristics was defined and validated, in order to help the usability evaluations of iDT applications. A usability checklist to be used when applying iDT heuristics is also proposed.La Televisión Digital Interactiva (TDi es considerada como la convergencia de la televisión y las tecnologías de la computación. La evaluación de usabilidad para aplicaciones basadas en tecnologías emergentes trae nuevos retos. La principal característica de la TDi es que los usuarios pueden interactuar con las aplicaciones; de esta manera la usabilidad es el principal aspecto a considerar cuando se diseñan aplicaciones de TDi. Las investigaciones actuales normalmente están enfocadas sobre las aplicaciones de TDi desde un punto de vista técnico, y no desde un enfoque centrado en el usuario. Hay una necesidad de nuevos métodos de evaluación de usabilidad o, por lo menos, utilizar de nuevas formas los métodos de evaluación existentes. Un conjunto de heurísticas de usabilidad específicas ha sido definido y validado, con el objetivo de ayudar en la evaluación de usabilidad de aplicaciones de TDi. También se ha propuesto una lista de verificación para ser usada al momento de aplicar las heurísticas de usabilidad.

  2. Observations of central stars

    International Nuclear Information System (INIS)

    Lutz, J.H.

    1978-01-01

    Difficulties occurring in the observation of central stars of planetary nebulae are reviewed with emphasis on spectral classifications and population types, and temperature determination. Binary and peculiar central stars are discussed. (U.M.G.)

  3. NIDDK Central Repository

    Data.gov (United States)

    U.S. Department of Health & Human Services — The NIDDK Central Repository stores biosamples, genetic and other data collected in designated NIDDK-funded clinical studies. The purpose of the NIDDK Central...

  4. Aplicaciones e inconvenientes de la técnica Hibridación in situ Fluorescente (FISH en la identificación de microorganismos

    Directory of Open Access Journals (Sweden)

    Raúl Rodríguez Martínez

    2013-01-01

    Full Text Available Durante el transcurso de los últimos años se ha reportado un gran número de aplicaciones de la técnica FISH, la cual es utilizada en la detección de microorganismos en su propio hábitat sin que requieran de su previo aislamiento y purificación. La importancia de FISH radica en la capacidad que tiene la sonda de ADN de detectar una región específica del áci- do nucleico de la célula microbiana y ser visualizada por microscopía de epifluorescencia. En esta revisión se describe los diversos usos que tiene FISH, que van desde la identifica- ción de la microbiota en ambientes acuáticos y su empleo en la biorremediación hasta la detección de patógenos en el diagnóstico clínico. Asimismo, se presentan algunas limita- ciones, y los posibles correctivos que se deben tener encuenta cuando se aplica esta técnica.

  5. Sobre la enseñanza de rudimentos de Estadística Bayesiana con aplicaciones en Economía y Empresa

    Directory of Open Access Journals (Sweden)

    María del Carmen Martel Escobar

    2000-01-01

    Full Text Available Los cursos de estadística, tanto elemental como avanzada, que actualmente se imparten en las facultades de ciencias económicas y empresariales (y posiblemente en las demás también de la gran mayoría de las universidades españolas, son cursos de estadística enfocada desde el punto de vista frecuentista. Después de una experiencia de tres cursos académicos, en este trabajo proponemos algunas estrategias para un curso de estadística bayesiana elemental, en el que las aplicaciones a casos reales cobran una especial importancia. El enfoque bayesiano se ajusta nítidamente al método científico de razonamiento y por tanto es este uno de los objetivos de este tipo de cursos. La aproximación bayesiana es subjetiva y requiere de la asignación de probabilidades a priori. Este hecho obliga al investigador a utilizar tanto su evidencia previa como la empírica proporcionada por el experimento que haya realizado. En el trabajo, discutimos algunas de las dificultades que encuentran los profesores y alumnos de un curso de estadística bayesiana introductorio y se propone un modelo de programa para estos cursos.

  6. Políticas Sobre Aprendizaje Móvil Y Estándares De Usabilidad Para El Desarrollo De Aplicaciones Educativas Móviles

    Directory of Open Access Journals (Sweden)

    William Oswaldo Cuervo Gómez

    2015-01-01

    Full Text Available Los adelantos tecnológicos llevados a cabo en los últimos años en el sector de los dispositivos móviles, han permitido que estos cuenten con mejores especificaciones de hardware y software, despertando la imaginación e interés de docentes, desarrolladores de contenidos y demás actores del proceso educativo, gracias a su característica de portabilidad, la cual facilita a los usuarios ejecutar tareas en cualquier momento y lugar. Por lo anterior, se realizó la revisión a publicaciones de la Unesco, en donde se identificaron políticas y recomendaciones que ayudan a obtener una mayor comprensión sobre cómo la incorporación de tecnologías móviles en contextos pedagógicos puede contribuir al mejoramiento de la calidad de la educación. Además, se realizó la revisión de literatura en las bibliotecas digitales IEEE Xplore, ScienceDirect, Scopus y Google Scholar, en donde se detectaron los principales conceptos, definiciones y recomendaciones sobre usabilidad,  los cuales deberán ser tenidos en cuenta en el diseño de aplicaciones educativas móviles.

  7. Oncoplastic central quadrantectomies

    Science.gov (United States)

    Pasta, Vittorio; D’Orazi, Valerio; Merola, Raffaele; Frusone, Federico; Amabile, Maria Ida; Buè, Rosanna; Monti, Marco

    2016-01-01

    Tumors localized in the central quadrant (centrally located breast tumors) have always represented a challenge for the surgeon because of the critical aesthetical matters related to the nipple-areola complex (NAC). Many years of experience with breast cancer patients treated by using various oncoplastic techniques, has allowed us to develop the modified hemibatwing for the treatment of central breast tumors, where the NAC is involved. Modified hemibatwing—along with the removal of the NAC—is a useful oncoplastic technique and it represents an ideal option for the treatment of central tumors because it assures oncological safety, a reduced surgical timetable and greater aesthetical results. PMID:27563564

  8. Central Laboratories Services

    Data.gov (United States)

    Federal Laboratory Consortium — The TVA Central Laboratories Services is a comprehensive technical support center, offering you a complete range of scientific, engineering, and technical services....

  9. Stimulation of S14 mRNA and lipogenesis in brown fat by hypothyroidism, cold exposure, and cafeteria feeding: evidence supporting a general role for S14 in lipogenesis and lipogenesis in the maintenance of thermogenesis

    Energy Technology Data Exchange (ETDEWEB)

    Freake, H.C.; Oppenheimer, J.H.

    1987-05-01

    In liver, thyroid hormone rapidly induces S14 mRNA, which encodes a small acidic protein. This sequence is abundantly expressed only in lipogenic tissues and is thought to have some function in fat metabolism. In the euthyroid rat, we measured 20-fold higher levels of S14 mRNA in interscapular brown adipose tissue than liver. Furthermore, whereas in liver or epididymal fat, hypothyroidism resulted in an 80% fall in S14 mRNA, in brown fat the level of this sequence increased a further 3-fold. In all three tissues, the expression of S14 mRNA correlated well with lipogenesis, as assessed by /sup 3/H/sub 2/O incorporation. Physiological activation of brown fat by chronic cold exposure or cafeteria feeding increased the concentration of S14 mRNA in this tissue and again this was accompanied by a greater rate of fatty acid synthesis. Overall, in liver and white and brown adipose tissue, S14 mRNA and lipogenesis were well correlated and strongly suggest a function of the S14 protein related to fat synthesis. These studies suggest that the S14 protein and lipogenesis may be important for thyroid hormone-induced and brown adipose tissue thermogenesis and that stimulation of these functions in hypothyroid brown fat is a consequence of decreased thyroid hormone-induced thermogenesis elsewhere.

  10. Using smart card technology to monitor the eating habits of children in a school cafeteria: 2. The nutrient contents of all meals chosen by a group of 8- to 11-year-old boys over 78 days.

    Science.gov (United States)

    Lambert, N; Plumb, J; Looise, B; Johnson, I T; Harvey, I; Wheeler, C; Robinson, M; Rolfe, P

    2005-08-01

    The aim of the study was to test the abilities of the newly created smart card system to track the nutrient contents of foods chosen over several months by individual diners in a school cafeteria. From the food choice and composition of food data sets, an Access database was created encompassing 30 diners (aged 8-11 years), 78 days and eight nutrients. Data were available for a total of 1909 meals. Based upon population mean values the cohort were clearly choosing meals containing higher than the recommended maximum amounts for sugar and lower than the recommended minimum amounts of fibre, iron and vitamin A. Protein and vitamin C contents of meals chosen were well above minimum requirements. Over the 1909 meals, nutrient requirements were met 41% of the time. The system created was very effective at continually monitoring food choices of individual diners over limitless time. The data generated raised questions on the common practice of presenting nutrient intakes as population mean values calculated over a few days. The impact of heavily fortified foods on such studies in general is discussed.

  11. Propuesta de un modelo de negocio en base a la identificación y caracterización de los factores más influyentes en el crecimiento del sector de descargas de aplicaciones y juegos en dispositivos móviles entre universitarios de clase media – alta de Quito

    OpenAIRE

    Romero Bedón, Félix Alberto

    2015-01-01

    El propósito de la presente tesis es identificar y diseñar un modelo de negocio que permita aprovechar las oportunidades del mercado de descarga de aplicaciones y juegos en dispositivos móviles entre universitarios de clase media-alta de Quito en sistemas iOS y Android. Entre los propósitos específicos se encuentran el esquematizar la evolución de los dispositivos móviles y el mercado de aplicaciones y juegos. Analizar el mercado de los dispositivos móviles y las descargas de juegos y aplicac...

  12. Diseño de un sistema de gestión de la calidad y su implementación, primera etapa, en un laboratorio de la Dirección Nacional de Investigación y Aplicaciones Nucleares, DNIAN

    OpenAIRE

    Wong López, Nancy Enriqueta

    2014-01-01

    237 hojas : ilustraciones, 29 x 21 cm + CD-ROM 5803 Resumen.- Se realizó el diseño e implementación de un Sistema de gestión de la calidad bajo las normas ISO 9000, con base en la identificación, descripción y caracterización de los procesos en un laboratorio de la Dirección Nacional de Investigación y Aplicaciones Nucleares, DNIAN, para brindar un mejor servicio al cliente interno y externo. La Subsecretaría de Control, Investigación y Aplicaciones Nucleares, SCIAN, forma parte del Mini...

  13. Energy saving by means of air conditioning equipment replacement and the household application of thermal insulation; Ahorro de energia electrica por reemplazo de equipos de aire acondicionado y aplicacion de aislamiento termico en viviendas

    Energy Technology Data Exchange (ETDEWEB)

    Peralta Solorio, Jose Luis [Fideicomiso para el Ahorro de la Energia (Mexico)

    2005-07-15

    An extension study of the Financing Program for Energy Saving looked for the evaluation of the electric energy saving potential obtained by the replacement of air conditioning equipment and the application of thermal insulation in 30 houses of two Mexican cities with warmth climate. In a joint effort with Comision Federal de Electricidad the consumption files of the users were analyzed and field measurements of electric demand and of refrigeration were made. As a following step the change of the refrigeration necessities derived from the application of thermal insulation were evaluated as well as the energy efficiency improvement obtained by the substitution of the air conditioning equipment and the favorable results obtained by the implementation of both measures - thermal insulation and change of air conditioning equipment in a joint form. This way, as a conclusion, the optimum sequence of application of these measures is revealed. [Spanish] Un estudio extension del Programa de Financiamiento para el Ahorro de Energia Electrica busco evaluar el potencial de ahorro de energia electrica alcanzado por el reemplazo de equipos de aire acondicionado y la aplicacion de aislamiento termico en 30 viviendas de dos ciudades mexicanas con clima calido. En un esfuerzo conjunto con la Comision Federal de Electricidad se analizaron los historiales de consumo de los usuarios y se efectuaron las mediciones de campo de demanda electrica y de refrigeracion. Como paso siguiente se valoro el cambio en las necesidades de refrigeracion derivado de la aplicacion de aislamiento termico al igual que la mejora en eficiencia energetica obtenida por la sustitucion de aire acondicionado y se identificaron los resultados favorecedores arrojados por la implementacion de ambas medidas -aislamiento termico y cambio de equipo de aire acondicionado- en forma conjunta. De esta manera, como conclusion, se devela la mas optima secuencia de aplicacion de estas medidas.

  14. Aplicaciones nativas de dispositivos móviles para acceso a la información personal de la pagina web de los estudiantes de la Universidad Politécnica Salesiana

    OpenAIRE

    Vera Rendón, John Alberto

    2013-01-01

    El presente artículo detalla el análisis, diseño e implementación de las aplicaciones móviles para los diferentes tipos de Sistemas Operativos de los dispositivos inteligentes que existen actualmente utilizando un framework multiplataforma, como alternativa para mejorar el acceso a la información personal de cada estudiante de la Universidad Politécnica Salesiana desde su dispositivo móvil inteligente, debido a problemas relacionados como la incompatibilidad, lentitud.

  15. Análisis termodinámico de soluciones extractoras de cloruros de calcio y de magnesio para aplicaciones de desalación de agua de mar basadas en ósmosis directa

    OpenAIRE

    Calado Ruz, Alberto

    2016-01-01

    En este proyecto, se intentará razonar el interés de una tecnología en desarrollo como la ósmosis directa, alternativa a una tecnología ya existente (ósmosis inversa) para aplicaciones de desalación de agua de mar. Para ello, se realizará un análisis termodinámico de diferentes sustancias, cuyos coeficientes osmóticos y de actividad fueron evaluados mediante un modelo basado en el modelo de Pitzer, en un rango de temperaturas determinado. Estas sustancias fueron propuestas en un artículo c...

  16. Degradación electroquímica y caracterización superficial de las aleaciones NiTi tratadas por un nuevo tratamiento de oxidación para aplicaciones biomédicas

    OpenAIRE

    Nuno André Rodrigues Diogo, Peixoto; Regina Fernanda Martins Alves Sousa, Caldeira

    2005-01-01

    Por sus únicas características de memoria de forma y superelasticidad, las aleaciones de NiTi son interesantes candidatos para aplicaciones biomédicas. Sin embargo, el principal problema que plantea la utilización de estas aleaciones está en su alto contenido en níquel que puede provocar alergias, reacciones tóxicas y cancerígenas. Por lo tanto, se desarrolló en trabajos previos un tratamiento de oxidación para evitar estas reacciones adversas y mejorar la biocompatibilidad del material. ...

  17. Planteamiento y evaluación de las aplicaciones de los productos obtenidos en la hidrólisis alcalina de las virutas de cromo generadas durante el procesamiento del cuero

    OpenAIRE

    Díaz, Andrea; Jiménez, Juliana; Pérez, Monica; Narváez Rincón, Paulo César

    2010-01-01

    Considerando el concepto de maximizar la reutilización de residuos sólidos de curtiembres en diversos usos industriales y la minimización del impacto ambiental que estos generan, se evalúan algunas aplicaciones de los subproductos obtenidos por la hidrólisis alcalina de las “virutas de cromo”5 generadas durante la etapa de rebalado en el procesamiento del cuero. El hidróxido de cromo obtenido transformado en sulfato de cromo mo- nobasico puede reutilizarse en el procesamiento del cuero co...

  18. Desarrollo práctico del proceso de captura y tratamiento digital en 3D de imágenes para ser utilizadas en impresión 3D y aplicaciones de animación y realidad aumentada

    OpenAIRE

    Soler Abelló, Joan

    2014-01-01

    El desarrollo práctico que se quiere elaborar tiene como objetivo describir paso a paso el proceso de captura o adquisición de datos de formas reales con cámaras capaces de obtener información 3D. Una vez realizada la captura, se deberá proceder a su tratamiento digital en 3D para posteriormente ser utilizadas en aplicaciones de realidad aumentada, animación e impresión 3D. The practical development that it is wanted to develop is to describe step by step the process for data capture or ac...

  19. Celda porta-muestras para análisis de intercambio isotópico H/D e interacciones moleculares para espectroscopía infrarroja de transmisión y sus aplicaciones

    OpenAIRE

    Carmona, Pedro; Rodríguez Casado, María Aránzazu; Molina, Marina

    2005-01-01

    Celda porta-muestras para análisis de intercambio isotópico H/D e interacciones moleculares para espectroscopia infrarroja de transmisión y sus aplicaciones. La invención presentada se refiere al diseño, fabricación y uso de una nueva celda porta-muestras para compuestos líquidos utilizable en espectroscopia infrarroja de transmisión. Su ventaja principal es que permite medir, caracterizar y observar, in situ y en tiempo real, el intercambio isotópico de hidrógeno por ...

  20. Sistema Oscilador Mejorado para Aplicaciones de Microbalanza (QCM) en Medios Líquidos y Propuesta de un Nuevo Método de Caracterización para Biosensores Piezoeléctricos

    OpenAIRE

    MONTAGUT FERIZZOLA, YEISON JAVIER

    2011-01-01

    La microbalanza de cristal de cuarzo (QCM) se usa como técnica alternativa de análisis químico, donde las aplicaciones dependen directamente de la sensibilidad del cristal. Por tanto, es el parámetro más importante que determina el uso de los cristales de cuarzo frente a otras técnicas. La ecuación de Sauerbrey, teóricamente relaciona la variación de la densidad de masa en la superficie del cristal con el cambio de la frecuencia y al mismo tiempo predice que la sensibilidad aumenta en la mis...

  1. Desarrollo rápido de software libre de alta calidad : Ingeniería de software asistida por computadora, enfocada en tareas, para agilizar el ciclo de vida de las aplicaciones, mediante mejora continua disciplinada a nivel personal

    OpenAIRE

    Reingart, Mariano Alejandro

    2015-01-01

    El presente artículo resume el estudio, desarrollo e implementación de un marco de trabajo teórico/práctico para creación y mantenimiento ágil de software libre, orientado al desarrollo de aplicaciones empresariales centradas en datos (principalmente transaccionales, con bases de datos relacionales, lenguaje de programación dinámico e interfaces web y visuales). Se analiza el estado del arte respecto a proyectos libres y abiertos (producción por pares, fomento, motivación, diversidad, goberna...

  2. Características y aplicaciones de software en dietética y nutrición para su uso en poblaciones sanas y pacientes críticos.

    OpenAIRE

    Cubero, J.; Narciso, D.; Valero, V.; Rodríguez, A.B.; Barriga Carrasco, Manuel

    2007-01-01

    Con el siguiente trabajo se ha tratado de iniciar una introducción a las características y aplicaciones de software en dietética y nutrición en el idioma castellano. Existen en la webincontable número de programas en nutrición y calculadoras nutricionales de muy insegura aplicación debido a su dudosa base de datos o a su inexistencia de autores. Para ello se han seleccionado los programas informáticos que presentan la mayor fiabilidad así como una relación calidad-precio óptima. Debido a la p...

  3. Central Diffraction at ALICE

    CERN Document Server

    Lämsä, Jerry W

    2011-01-01

    The ALICE experiment is shown to be well suited for studies of exclusive final states from central diffractive reactions. The gluon-rich environment of the central system allows detailed QCD studies and searches for exotic meson states, such as glueballs, hybrids and new charmonium-like states. It would also provide a good testing ground for detailed studies of heavy quarkonia. Due to its central barrel performance, ALICE can accurately measure the low-mass central systems with good purity. The efficiency of the Forward Multiplicity Detector (FMD) and the Forward Shower Counter (FSC) system for detecting rapidity gaps is shown to be adequate for the proposed studies. With this detector arrangement, valuable new data can be obtained by tagging central diffractive processes.

  4. Desarrollo de sustratos conductores sin corrosión para aplicaciones fotovoltaicas sobre gres porcelánico mediante el proceso “libre de electrodos”

    Directory of Open Access Journals (Sweden)

    Reyes-Tolosa, M. D.

    2010-10-01

    Full Text Available In the incipient world of functional industrial ceramics with photovoltaic applications, there is a need to reduce production costs while maximizing the systems’ useful life. The thin contact layers currently being manufactured are based on vacuum systems with high production costs and major problems of accelerated corrosion in photovoltaic applications. The electroless process produces very even and compact layers with very low costs through chelate-based chemicals. These layers have been formulated in this study with a view to obtaining appropriate electric characteristics for an optimum photoelectric performance in the assemblies. The morphological requirements are previously fitted through a glaze that acts as a barrier layer between the deposited coating and the porcelain tile, applied through tape casting. The characterisation of the metal layers obtained is started by SEM, an AFM and the Hall effect in order to determine the morphology and chemical characteristics required for these contact layers. The electric characterisation also allows their capacity for offering an optimum performance in the assemblies to be assessed. Finally, the performance of these layers with respect to corrosion is assessed in order to complete the assessment of their industrial suitability.

    En el incipiente mundo de las cerámicas industriales funcionales con aplicaciones fotovoltaicas existe la necesidad de reducir costes de producción al tiempo que se maximiza la vida útil de los sistemas. Las capas delgadas para contactos que se fabrican en la actualidad se basan en sistemas a vacio con altos costes de producción y una fuerte problemática de corrosión acelerada en aplicaciones fotovoltaicas. El proceso “libre de electrodos” (“electroless” produce por vía química a partir de quelatos capas muy uniformes y compactas con costes muy reducidos. En el presente trabajo se formulan estas capas con vistas a conseguir características el

  5. LA RESONANCIA MAGNÉTICA Y SUS APLICACIONES EN LA AGROINDUSTRIA, UNA REVISIÓN THE MAGNETIC RESONANCE AND ITS AGRO-INDUSTRY APPLICATIONS, A REVIEW

    Directory of Open Access Journals (Sweden)

    Iván Darío Aristizábal Torres

    2007-12-01

    Full Text Available Las propiedades electromagnéticas que presentan el hidrógeno y otros núcleos que componen los productos agroalimentarios han permitido usar ampliamente la Resonancia Magnética (RM para estudiar, de manera no destructiva, la composición y la estructura interna de estos materiales biológicos en una escala tanto macroscópica como microscópica. En este artículo se explican los principios físicos que sustentan la RM, así como el equipo básico requerido para medir las señales de RM de cualquier muestra biológica y el procedimiento de adquisición de una imagen de RM. También, se hace una revisión de las principales aplicaciones en el sector agroalimentario, destacando principalmente los estudios desarrollados con ésta tecnología para examinar la calidad interna de las frutas y los vegetales. En estos productos, la RM ha sido utilizada para detectar e investigar la evolución de los diferentes factores que determinan la calidad interna luego de la cosecha, durante el almacenamiento y después del procesamiento poscosecha. Los estudios en poscosecha que más se han realizado con ésta tecnología son los relacionados con desordenes de tipo fisiológico que se producen en las frutas durante su almacenamiento y conservación en frío en atmósferas controladas y modificadas. Se espera en un futuro no muy lejano aplicaciones comerciales de sensores de RM en línea, basados en magnetos de bajo campo o con sistemas simplificados de análisis de imágenes, que permitan la determinación rápida y no destructiva de la calidad interna de los productos agroalimentarios.The electromagnetic properties that present hydrogen and other nucleus of agroalimentary products, have allowed widely use of Magnetic Resonance (MR to study the composition and internal structure of these biological materials in a micro and macrocospic scale, in a nondestructive way. In this paper the physical principles, basic equipment to measure the MR signals and the MR

  6. Materiales compuestos C/SiC para aplicaciones estructurales de alta temperatura. Parte II: Sistemas de protección contra la oxidación

    Directory of Open Access Journals (Sweden)

    Aparicio, M.

    2001-02-01

    Full Text Available The fact which currently excludes the use of C/SiC composites in high temperature structural applications is the high oxidation rate of carbon fibres at temperatures higher than 450ºC. In this second part of the paper, a review of the different oxidation protection systems, including inhibitors, surface modification of composites, coatings and previous infiltration of the substrates, has been carried out. The addition of inhibitors reduces the oxidation rate, but only up to 850ºC, while the surface modification of composites leads to thin coatings with poor thermal shock resistance. On the other hand, the external layers are the most usual method employed because allows combining different compositions and thicknesses. The multilayer coatings are especially interesting in applications with wide temperature range and thermal shocks requirements. The infiltration of substrate porosity improves slightly the oxidation resistance of C/SiC composites reducing the oxygen accessibility to carbon fibres. However, the infiltration complements very well the oxidation protection performance of a coating system at low temperature, since these normally present open cracks due to mismatch between coating and substrate thermal expansion coefficients.

    La utilización de los materiales compuestos C/SiC en aplicaciones estructurales a alta temperatura está limitada por la elevada velocidad de oxidación de la fibra de carbono a temperaturas superiores de 450ºC. En esta segunda parte del trabajo se realiza una revisión de las posibilidades de protección contra la oxidación de estos materiales, incluyendo inhibidores, modificación superficial del material compuesto, recubrimientos e infiltración previa del sustrato. La eficacia de los inhibidores de la reacción de oxidación esta restringida a temperaturas de hasta 850ºC, mientras que la modificación superficial del material compuesto da lugar a capas delgadas y poco resistentes a los ciclos t

  7. Explorando nuevos recursos virtuales con alumnos de Informática: aplicaciones educativas a las clases de Inglés

    Directory of Open Access Journals (Sweden)

    Martin, C. Adriana Nelly

    2012-12-01

    Full Text Available El hecho innegable que los recursos de la Web Social han impactado positivamente en la enseñanza de lenguas extranjeras, nos hace abrirnos a la perspectiva que supone la transferencia de dichas tecnologías al campo educativo. A tal efecto, sostenemos que los actuales quehaceres y prácticas educativas resultan fértiles para ser potenciados con la adopción de aplicaciones tecnológicas innovadoras, que signifiquen una ganancia cognitiva tanto para los que aprenden como para los que enseñan. Este trabajo presenta una experiencia educativa en la que participaron alumnos que cursaban la asignatura Inglés II, incluida en los planes de estudio de las Licenciaturas en Ciencias de la Computación y en Sistemas de Información, pertenecientes a la Facultad de Ciencias Exactas, Físicas y Naturales de la UNSJ (Argentina. La propuesta tomó como referencia el Modelo COMPETICE y tenía como objetivo que los alumnos aplicaran competencias tecnológicas, procedimentales, actitudinales y de gestión de información, usando diversos recursos digitales orientados a promover no sólo aprendizajes individuales autónomos sino también sociocolaborativos. Se diseñaron tareas extra-áulicas para que los estudiantes vivenciaran el uso de diccionarios, glosarios, traductores, gramáticas en línea y foro, y los aplicaran para adquirir conocimientos de su especialidad, investigar y autogestionar contenidos curriculares de la asignatura

  8. Formación de porosidad durante la soldadura láser de Nd: YAG de onda continua en aleaciones de aluminio para aplicaciones automotrices

    Directory of Open Access Journals (Sweden)

    Pastor, Mario

    2000-04-01

    Full Text Available Pore formation is an important concern in laser welding of automotive aluminum alloys. This paper investigates the influence of the laser beam defocusing on pore formation during continuous wave Nd: YAG laser welding of aluminum automotive alloys 5182 and 5754. It was found that the instability of the keyhole during welding was a dominant cause of pore formation while hydrogen rejection played an insignificant role. The defocusing of the laser beam greatly affected the stability of the keyhole. Finally, the mechanism of the collapse of the keyhole and pore formation is proposed.

    La formación de poros es un aspecto de gran preocupación durante la soldadura láser de aleaciones de aluminio. En este trabajo se ha investigado la influencia del desenfoque del haz del láser sobre la formación de poros durante la soldadura láser (Nd: YAG de onda continua de las aleaciones de aluminio 5182 y 5754, las mismas que se usan en aplicaciones automotrices. Los resultados obtenidos indicaron que la causa dominante de formación de poros fue la inestabilidad de la cavidad de vapor o keyhole mientras que la influencia del hidrógeno fue prácticamente insignificante. El grado de desenfoque del láser tuvo gran influencia sobre la inestabilidad de la cavidad de vapor. Finalmente, en este artículo se propone el mecanismo de formación de poros a causa del colapso de la cavidad de vapor (keyhole.

  9. Simulation of the flow phenomena in geothermal wells: developments and applications; Simulacion de los fenomenos de flujo en pozos geotermicos: desarrollos y aplicaciones

    Energy Technology Data Exchange (ETDEWEB)

    Garcia Gutierrez, Alfonso [Instituto de Investigaciones Electricas, Cuernavaca (Mexico)

    1994-07-01

    In this paper the numerical simulators and the specialized computer programs that have been developed in the Departamento de Geotermia of the Instituto de Investigaciones Electricas (IIE) for the study of mass transport phenomena, momentum and heat in geothermal wells, are delineated. The developments can be assembled in 5 types: a) Fluid circulation during geothermal well construction; b) Production; c) Construction; d) Return to the thermal equilibrium; e) Thermodynamic and fluid transport properties, cements, and rocks. The applications realized include, besides the normal flow phenomena that occur in geothermal wells, the study of special problems that have been found in several wells of the geothermal fields in the country. These developments constitute a tool of great utility for the reservoir engineer`s daily work and for the understanding of the specific phenomena of infrequent occurrence. [Espanol] En este trabajo se describen los simuladores numericos y programas de computo especializados que se han desarrollado en el Departamento de Geotermia del Instituto de Investigaciones Electricas (IIE), para estudiar los fenomenos de transporte de masa, momentum y calor en pozos geotermicos. Los desarrollos pueden agruparse en 5 tipos: a) circulacion de fluidos durante la construccion de pozos, b) produccion, c) inyeccion, d) retorno a equilibrio termico, e) propiedades termodinamicas y de transporte de los fluidos, cementos y rocas. Las aplicaciones realizadas incluyen, ademas de los fenomenos normales de flujo que ocurren en pozos geotermicos, el estudio de problemas especiales que se han encontrado en diversos pozos de los campos geotermicos del pais. Estos desarrollos constituyen una herramienta de gran utilidad para el trabajo diario del ingeniero de yacimientos y para el entendimiento de fenomenos especificos de ocurrencia poco frecuente.

  10. Las monografías de Publicidad a través de las aplicaciones documentales ISBN y REBIUN: un estudio bibliográfico (2008-2012

    Directory of Open Access Journals (Sweden)

    Carlos Oliva Marañón

    2013-09-01

    Full Text Available Las Tecnologías de la Información y de la Comunicación han experimentado un gran avance durante los últimos años. Los recursos documentales disponibles en la Red se han puesto al servicio del investigador. Se trata de una documentación online a la que se accede por diferentes medios, pero siempre utilizando sistemas en línea, principalmente, Internet. El objetivo de esta investigación es evaluar la producción científica de monografías en el área de Publicidad durante el quinquenio 2008-2012. Se ha consultado la base de datos del  International Standard Book Number (ISBN, gestionada por el Ministerio de Educación, Cultura y Deporte, así como la Red de Bibliotecas Universitarias Españolas (REBIUN, auspiciada por la Conferencia de Rectores de las Universidades Españolas (CRUE, que incluye los fondos documentales del Consejo Superior de Investigaciones Científicas (CSIC. Las búsquedas se han realizado por materia y fecha de publicación. Además, se han estudiado variables como la producción científica por años, la visibilidad de las editoriales y la cobertura geográfica de las publicaciones. Los resultados confirman la elevada producción científica en la disciplina de Publicidad con 1.298 monografías, situándose el año 2008 como el de mayor visibilidad; la prevalencia de la Comunidad de Madrid y Cataluña como referentes editoriales; así como la pertinencia de estas aplicaciones documentales para docentes, investigadores y profesionales vinculados al ámbito publicitario.

  11. ESTIMULACIÓN MAGNÉTICA TRANSCRANEAL: PRINCIPIOS BÁSICOS Y APLICACIONES EN LA ACTIVIDAD FÍSICA Y EL DEPORTE

    Directory of Open Access Journals (Sweden)

    M. Fernández del Olmo

    2010-09-01

    Full Text Available

     

    RESUMEN

    La Estimulación Magnética Transcraneal (EMT es un técnica novedosa que permite estimular la corteza cerebral humana de forma no invasiva, indolora y sin efectos secundarios siempre y cuando se respeten los protocolos de seguridad establecidos. Su utilidad cubre un amplio abanico extendiéndose desde el estudio de las corteza motora hasta los correlatos fisiológicos de las funciones cognitivas, pasando por el tratamiento de determinadas enfermedades neurológicas o por el estudio del tiempo de reacción. En este trabajo, ofrecemos una introducción a las características de la EMT y revisamos sus principales aplicaciones haciendo énfasis en su posible validez como instrumento de investigación aplicado a las Ciencias del Deporte.
    PALABRAS CLAVE:

     

    ABSTRACT

    Transcranial Magnetic Stimulation (TMS is a novel technique which permits painless stimulation of the cerebral cortex in humans without requiring open access to the brain, and if used following appropriate guidelines, is devoid of important side effects. TMS has been broadly used. It began as a tool for studying motor cortex function, but is now being used to look at cognitive functions, to treat neurological disorders or to study the reaction time. In this article we like to review the technical aspects of TMS and its main applications, and discuss the possibility of using TMS as a research tool to study Sport Sciences.
    KEY WORDS:

  12. Carbones colombianos: clasificación y caracterización termoquímica para aplicaciones energéticas

    Directory of Open Access Journals (Sweden)

    Rolando Barrera Zapata

    2014-12-01

    Full Text Available La relación reservas/producción de carbón en Colombia ronda los 91 años. Para aprovechar tal disponibilidad del carbón mediante tecnologías de alta eficiencia, es necesario contar con la adecuada caracterización de los diferentes carbones. En este trabajo se analizaron 10 muestras de carbones colombianos con diferentes rangos y calidad, procedentes de diferentes locaciones geográficas. Cada muestra se caracterizó según su análisis próximo, análisis último, análisis termogravimétrico (TGA y poder calorífico. Se estableció el rango o calidad de cada muestra según diferentes métodos estandarizados, incluyendo normas ASTM, diagramas de Van Kleveler, método gráfico de Parr y la norma ISO 11760-2005. Adicionalmente se determinó la reactividad de las muestras a través de análisis TGA y análisis térmico diferencial (DTG. Se encontró que los carbones de mayor rango o calidad no necesariamente resultan ser los más reactivos para aplicaciones energéticas, ya que a mayor proporción de carbono fijo, la liberación de material volátil tiende a ser más lenta, disminuyendo su capacidad de uso y transformación en procesos termoquímicos.

  13. "Central Station" Londonis

    Index Scriptorium Estoniae

    2000-01-01

    Londoni galeriis Milch seitsme läti, leedu ja eesti kunstniku projekt "Central Station". Kuraatorid Lisa Panting, Sally Tallant. Eestist osalevad Hanno Soans (Catarina Campinoga koostöös valminud video), Kiwa, Kai Kaljo

  14. Central nervous system resuscitation

    DEFF Research Database (Denmark)

    McIntosh, T K; Garde, E; Saatman, K E

    1997-01-01

    Traumatic injury to the central nervous system induces delayed neuronal death, which may be mediated by acute and chronic neurochemical changes. Experimental identification of these injury mechanisms and elucidation of the neurochemical cascade following trauma may provide enhanced opportunities...

  15. Outsourcing central banking

    DEFF Research Database (Denmark)

    Khoury, Sarkis Joseph; Wihlborg, Clas

    2005-01-01

    The literature on Currency Boards (CB) stops at the water edge in terms of dealing with the totality of the functions of a central bank. Monetary policy, and banking supervisioncan be "outsourced" in an open economy with substantial foreign direct investment (FDI)in the banking sector if political...... nationalism does not trump economic rationality. An orthodox CB renders the central banking function redundant in terms of interest rate and exchange rate determination. FDI in banking could perform the same role for the supervisory function of central banks. We use the case of Estonia to illustrate...... the feasibility of, and constraints on, outsourcing of central bank functions. A brief discussion of the Argentinian experience is used for contrast.Key words: Currency Board, Foreign Banks, Supervision, Regional Integration,outsourcing....

  16. Central nervous system

    Science.gov (United States)

    The central nervous system is composed of the brain and spinal cord. Your brain and spinal cord serve as the main "processing center" for your entire nervous system. They control all the workings of your body.

  17. Automated Recognition of Bioacoustic Signals: a Review of Methods and Applications Reconocimiento automatizado de señales bioacústicas: Una revisión de métodos y aplicaciones

    Directory of Open Access Journals (Sweden)

    Paula Catalina Caycedo-Rosales

    2013-11-01

    Full Text Available During the past decade, numerous research studies and applications on automated bioacoustic monitoring have been published; however, such studies are scattered in the literature of engineering and life sciences. This paper presents a review on fundamental concepts of automated acoustic monitoring. Our aim is to compare and categorize —in a taxonomy of techniques DSP/PR— the contributions of published research studies and applications; in order to suggest some directions for future research and highlight challenges and opportunities related to the deployment of this technology in Colombia.Durante la última década se ha publicado una gran cantidad de estudios de investigación y aplicaciones sobre monitoreo bioacústico automatizado. No obstante, tales estudios están dispersos en la literatura de ingeniería y ciencias biológicas. En este artículo se presentan conceptos fundamentales sobre monitoreo bioacústico automatizado; se revisan, comparan y categorizan —en una taxonomía de técnicas de DSP/PR— las contribuciones de las investigaciones y las aplicaciones publicadas; se sugieren algunas direcciones para investigaciones futuras y se resaltan los retos y las oportunidades relacionados con la instalación de esta tecnología en Colombia.

  18. Una introducción a la Computación Evolutiva y alguna de sus aplicaciones en Economía y Finanzas || An Introduction to Evolutionary Computation and some of its Applications in Economics and Finance

    Directory of Open Access Journals (Sweden)

    Coello Coello, Carlos A.

    2006-12-01

    Full Text Available Este artículo pretende proporcionar un panorama general de la computación evolutiva, sus orígenes, sus paradigmas principales y algunas de sus aplicaciones en Economía y Finanzas. Se discuten, entre otras cosas, los descubrimientos científicos más importantes que originaron el denominado Neo-Darwinismo, que es la teoría en la que se basa la computación evolutiva. También se proporciona una breve cronología de acontecimientos clave que desembocaron en los tres paradigmas en uso más común dentro de la computación evolutiva moderna: los Algoritmos Genéticos, la Programación Evolutiva y las Estrategias Evolutivas. En la segunda parte del artículose proporcionan algunas aplicaciones representativas del uso de algoritmos evolutivos en Economía y Finanzas, así como algunas de las tendencias de investigación en el Área.

  19. Isolated central vestibular syndrome.

    Science.gov (United States)

    Kim, Sung-Hee; Park, Seong-Ho; Kim, Hyo-Jung; Kim, Ji-Soo

    2015-04-01

    Isolated vestibular syndrome may occur all along the vestibular pathways from the peripheral labyrinth to the brain. By virtue of recent developments in clinical neurotology and neuroimaging, however, diagnosis of isolated central vestibulopathy is increasing. Here, we review five distinct syndromes of isolated central vestibular syndrome from lesions restricted to the vestibular nuclei, the nucleus prepositus hypoglossi, the flocculus, the tonsil, and the nodulus, and introduce a new vestibular syndrome from isolated involvement of the inferior cerebellar peduncle. Decreased responses to head impulses do not exclude a central lesion as a cause of isolated vestibular syndrome. Brain imaging, including diffusion-weighted magnetic resonance imaging (MRI), may be falsely negative during the acute phase in patients with isolated vestibular syndrome because of a stroke. Central signs should be sought carefully in patients with isolated vertigo, even when the patients show the features of peripheral vestibulopathy and negative MRIs. Recognition of these isolated central vestibular syndromes would aid in defining the lesions responsible for various vestibular manifestations in central vestibulopathy. © 2015 New York Academy of Sciences.

  20. Binned level-3 Sea Surface Salinity from Aquarius/Satélite de Aplicaciones Científicas (SAC)-D mission in support of the National Centers for Environmental Information (NCEI) data quality monitoring system (DQMS) from 2011-08-28 to 2015-06-10 (NCEI Accession 0151631)

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — The data quality monitoring system (DQMS) for the Aquarius/Satélite de Aplicaciones Científicas (SAC)-D satellites level-2 sea-surface salinity (SSS) swath data...

  1. Chronic administration of grape-seed polyphenols attenuates the development of hypertension and improves other cardiometabolic risk factors associated with the metabolic syndrome in cafeteria diet-fed rats.

    Science.gov (United States)

    Pons, Zara; Margalef, Maria; Bravo, Francisca I; Arola-Arnal, Anna; Muguerza, Begoña

    2017-01-01

    The effects of grape-seed polyphenols against the development of hypertension and other cardiometabolic conditions associated with the metabolic syndrome (MetS) were studied in rats fed a high-fat, high-carbohydrate diet, known as the cafeteria (CAF) diet. Two groups of Wistar rats were fed standard (STD) or CAF diets for 12 weeks. The CAF diet-fed rats were administered different doses of a low-molecular-weight grape-seed polyphenol extract (LM-GSPE) (25, 100 and 200 mg/kg per d) or vehicle daily, and the STD diet-fed rats were administered LM-GSPE (100 mg/kg per d) or vehicle using ten animals per group. Body weight (BW), waist perimeter (WP) and systolic and diastolic blood pressures (BP) by the tail-cuff method were recorded weekly. The animals were housed in metabolic chambers every 2 weeks to estimate daily food and liquid intakes and to collect faeces and urine samples. The plasma lipid profile was analysed at time 0 and on the 4th, 7th, 10th and 12th weeks of the experiment. Moreover, plasma leptin was measured at the end of the experiment. Results demonstrated that LM-GSPE, when administered with the CAF diet, attenuated the increase in BP, BW, WP and improved lipid metabolism in these animals. However, although the 25- and 100-mg/kg per d doses were sufficient to produce beneficial effects on BP and lipid metabolism, a 200-mg/kg per d dose was necessary to have an effect on BW and WP. The present findings suggest that LM-GSPE is a good candidate for a BP-lowering agent that can also ameliorate other conditions associated with the MetS.

  2. In rats fed high-energy diets, taste, rather than fat content, is the key factor increasing food intake: a comparison of a cafeteria and a lipid-supplemented standard diet.

    Science.gov (United States)

    Oliva, Laia; Aranda, Tània; Caviola, Giada; Fernández-Bernal, Anna; Alemany, Marià; Fernández-López, José Antonio; Remesar, Xavier

    2017-01-01

    Food selection and ingestion both in humans and rodents, often is a critical factor in determining excess energy intake and its related disorders. Two different concepts of high-fat diets were tested for their obesogenic effects in rats; in both cases, lipids constituted about 40% of their energy intake. The main difference with controls fed standard lab chow, was, precisely, the lipid content. Cafeteria diets (K) were self-selected diets devised to be desirable to the rats, mainly because of its diverse mix of tastes, particularly salty and sweet. This diet was compared with another, more classical high-fat (HF) diet, devised not to be as tasty as K, and prepared by supplementing standard chow pellets with fat. We also analysed the influence of sex on the effects of the diets. K rats grew faster because of a high lipid, sugar and protein intake, especially the males, while females showed lower weight but higher proportion of body lipid. In contrast, the weight of HF groups were not different from controls. Individual nutrient's intake were analysed, and we found that K rats ingested large amounts of both disaccharides and salt, with scant differences of other nutrients' proportion between the three groups. The results suggest that the key differential factor of the diet eliciting excess energy intake was the massive presence of sweet and salty tasting food. The significant presence of sugar and salt appears as a powerful inducer of excess food intake, more effective than a simple (albeit large) increase in the diet's lipid content. These effects appeared already after a relatively short treatment. The differential effects of sex agree with their different hedonic and obesogenic response to diet.

  3. In rats fed high-energy diets, taste, rather than fat content, is the key factor increasing food intake: a comparison of a cafeteria and a lipid-supplemented standard diet

    Directory of Open Access Journals (Sweden)

    Laia Oliva

    2017-09-01

    Full Text Available Background Food selection and ingestion both in humans and rodents, often is a critical factor in determining excess energy intake and its related disorders. Methods Two different concepts of high-fat diets were tested for their obesogenic effects in rats; in both cases, lipids constituted about 40% of their energy intake. The main difference with controls fed standard lab chow, was, precisely, the lipid content. Cafeteria diets (K were self-selected diets devised to be desirable to the rats, mainly because of its diverse mix of tastes, particularly salty and sweet. This diet was compared with another, more classical high-fat (HF diet, devised not to be as tasty as K, and prepared by supplementing standard chow pellets with fat. We also analysed the influence of sex on the effects of the diets. Results K rats grew faster because of a high lipid, sugar and protein intake, especially the males, while females showed lower weight but higher proportion of body lipid. In contrast, the weight of HF groups were not different from controls. Individual nutrient’s intake were analysed, and we found that K rats ingested large amounts of both disaccharides and salt, with scant differences of other nutrients’ proportion between the three groups. The results suggest that the key differential factor of the diet eliciting excess energy intake was the massive presence of sweet and salty tasting food. Conclusions The significant presence of sugar and salt appears as a powerful inducer of excess food intake, more effective than a simple (albeit large increase in the diet’s lipid content. These effects appeared already after a relatively short treatment. The differential effects of sex agree with their different hedonic and obesogenic response to diet.

  4. A escola promovendo hábitos alimentares saudáveis: uma proposta metodológica de capacitação para educadores e donos de cantina escolar Promotion of healthy eating habits by schools: a methodological proposal for training courses for educators and school cafeteria owners

    Directory of Open Access Journals (Sweden)

    Bethsáida de Abreu Soares Schmitz

    2008-01-01

    Full Text Available O projeto A Escola Promovendo Hábitos Alimentares Saudáveis estimula, desde 2001 no Distrito Federal, Brasil, a formação de bons hábitos alimentares na comunidade escolar, no contexto da promoção de estilos de vida saudáveis e prevenção das doenças crônicas não- transmissíveis. Este trabalho apresenta e avalia uma metodologia desenvolvida em 2006, para capacitação de educadores do ensino infantil e fundamental até a 4ª série e donos de cantina escolar. As oficinas tiveram aulas expositivas, atividades práticas, jogos educativos, entre outros. Como indicadores de avaliação analisaram-se itens relacionados à ampliação e aplicabilidade dos conhecimentos, além da implantação dos 10 passos da cantina escolar saudável. As atividades pedagógicas propostas foram verificadas pela análise dos portfólios dos educadores. A avaliação geral foi positiva, houve ampliação dos conhecimentos (p The project entitled Promotion of Health Eating Habits by Schools, operating in the Federal District of Brazil since 2001, encourages good eating habits in the school community within the context of promoting healthy lifestyles and preventing chronic non-communicable diseases. The current article presents and analyzes a methodology to train preschool and elementary educators and school cafeteria owners. The workshops included theoretical classes, practical activities, and educational games and were evaluated on the basis of expansion and applicability of knowledge, in addition to implementation of the 10 steps to a healthy school cafeteria. The proposed pedagogical activities were verified by an analysis of the teachers' workshop folders. The overall evaluation was positive, with expansion of knowledge (p < 0.05 among participants for the three workshop modules. The objectives laid out in the workshop folders were reached by 44% of the teachers. In the implementation of the healthy cafeteria, positive results were observed when comparing

  5. Development of applications in Internet for the calculation of solar control devices; Desarrollo de una aplicacion en Internet para el calculo de dispositivos de control solar

    Energy Technology Data Exchange (ETDEWEB)

    Perez V, Jesus B; Robles G, Saul; Villa M, Hector A; Cabanillas L, Rafael E [Universidad de Sonora, Hermosillo, Sonora (Mexico)

    2000-07-01

    permite a los usuarios hacer los calculos en forma interactiva. Este software hace posible que cualquier usuario de Internet pueda correr esta aplicacion desde su computadora, evitando el uso de compiladores especiales o procedimientos complicados para correr los programas, como ocurre con los lenguajes tradicionales. Con este sitio se pretende cubrir la necesidad de contar con recursos de calculo accesibles, sencillos y confiables para arquitectos e ingenieros civiles, que apoyen la utilizacion de energia al incluir criterios de diseno bioclimaticos en la construccion.

  6. APLICACIONES CLÍNICAS DE LAS TÉCNICAS NUCLEARES EN EL ESTUDIO DEL SINCRONISMO VENTRICULAR / Clinical applications of nuclear techniques in the study of ventricular synchronism

    Directory of Open Access Journals (Sweden)

    Amalia Peix González

    2012-07-01

    Full Text Available ResumenTécnicas incruentas como la ecocardiografía, la resonancia magnética nuclear y los estudios de Medicina Nuclear (ventriculografía radioisotópica y gammagrafía de perfusión miocárdica con tomografía de emisión de fotón único, proporcionan información indirecta sobre el sincronismo ventricular cuando se utilizan parámetros de contractilidad mecánica. El análisis de fase de Fourier es un instrumento útil para el empleo de técnicas nucleares con este propósito y se ha aplicado, tanto en la ventriculografía radioisotópica como en la gammagrafía de perfusión. En este trabajo se presenta una revisión en el tiempo de los fundamentos y aplicaciones clínicas de las técnicas nucleares en el estudio del sincronismo ventricular. En la actualidad es la gammagrafía SPECT-gatillada, dentro de las técnicas nucleares, la más utilizada, por la posibilidad que ofrece de evaluar perfusión, función y sincronismo intraventricular en el mismo examen. / AbstractNoninvasive techniques such as echocardiography, nuclear magnetic resonance imaging and nuclear medicine studies (radionuclide ventriculography and myocardial perfusion scintigraphy with single photon emission tomography, provide indirect information about ventricular synchronism when parameters of mechanical contractility are used. The Fourier phase analysis is a useful tool for the use of nuclear techniques for this purpose, and has been applied in both radionuclide ventriculography and perfusion scintigraphy. A review in time of the basics and clinical applications of nuclear techniques in the study of ventricular synchronism is presented in this article. Nowadays, the gated-SPECT scintigraphy is the most common among nuclear techniques because it allows assessing perfusion, function, and intraventricular synchronism in the same test.

  7. Revisión de las aplicaciones de la electroerosión por penetración al mecanizado de cerámicas conductoras

    Directory of Open Access Journals (Sweden)

    Puertas-Arbizu, I.

    2002-10-01

    Full Text Available The term of technical ceramics or advanced ceramics is applied to a great emerging variety of materials, which have excellent properties such as hardness, wear resistance, corrosion resistance, mechanical strength, in a wide range of temperature , among others. Nevertheless, materials with high quality performance are also difficult to manufacture, and ceramic materials are not the exception. The majority of the ceramic materials are not conductive, but however, the use of new metallic pigments and compounds makes it feasible to become them conductive and, therefore, these ceramics can be machined by the EDM process. The present work is a review of the different applications of technical ceramics, concentrating on the conductive ceramics. Moreover, the machining processes that can be employed for their manufacturing are to be shown, focusing attention on the die sinking EDM process.

    El término de materiales cerámicos técnicos o materiales cerámicos avanzados se aplica a una gama emergente de materiales, que tienen unas propiedades excelentes de dureza, resistencia al desgaste, resistencia mecánica, resistencia a la corrosión, en un amplio rengo de temperatura. Sin embargo, los materiales con buenas prestaciones suelen ser difíciles de procesar y los materiales cerámicos no son la excepción. Aunque la mayor parte de los materiales cerámicos no son conductores, gracias a la utilización de determinados aditivos metálicos es posible hacer que lo sean y, por lo tanto, éstos pueden ser mecanizados por procesos de electroerosión. El presente trabajo es una revisión de las diferentes aplicaciones de los materiales cerámicos, haciéndose especial hincapié en los materiales cerámicos conductores, así como de los procesos de mecanizado que se pueden emplear en su fabricación, incidiendo fundamentalmente sobre el proceso de la electroerosión por penetración.

  8. Aplicaciones de la geoinformación en el desarrollo de proyectos turísticos en espacios forestales: el ejemplo de

    Directory of Open Access Journals (Sweden)

    Carmen Quintano

    2010-10-01

    Full Text Available ResumenEl trabajo presenta y analiza el proyecto de geoturismo denominado La Mirada Circular, un importante proyecto de desarrollo socio-económico y conservación de los recursos forestales en la comarca de El Bierzo de la Comunidad Autónoma de Castilla y León (España. La comarca de El Bierzo es una importante área natural con dos espacios declarados por la UNESCO como Patrimonio de la Humanidad (Las Médulas y como Reserva de la Biosfera (Los Ancares. Además la comarca cuenta con importantes espacios integrados en la Red Natura 2000 de la Unión Europea. El geo-portal del proyecto (www.lamiradacircular.com es la gran apuesta de investigación y utilización de las Geotecnologias de la Información y el Conocimiento (Geo-TIC en dos de los sectores más importantes del estado español: los sectores turístico y forestal. El proyecto, a partir de la aplicación exhaustiva de las Geo-TIC, desarrolla los conceptos de geoturismo y turismo inteligente, implementando novedosas aplicaciones (GPS, Geopodcasting, Mobile Mapping, Códigos QR, realidad virtual, etc. que conviertan el territorio forestal en un verdadero museo interpretativo tanto en una dimensión real como virtual. AbstractThe presents paper analyzes the geo-tourism project called “La Mirada Circular” (the Circular Look, a major project of socio-economic and forest resource conservation in the region of El Bierzo region of Castilla y León (Spain. The region of El Bierzo is an important natural area with two sites identified by UNESCO as a World Heritage Site (The Médulas and as a Biosphere Reserve (The Ancares. In addition the county has important integrated areas in the Natura 2000 network of the European Union. The project website (www.lamiradacircular.com is the great challenge of research and use of Geo Information and Knowledge (Geo-ICT in two of the largest Spanish sectors of the Spanish state: the tourism sector and the forest sectors. The draft from the comprehensive

  9. Extracción convencional de oleorresina de pimentón dulce y picante I. Generalidades, composición, proceso e innovaciones y aplicaciones

    Directory of Open Access Journals (Sweden)

    Fernández-Trujillo, J. Pablo

    2007-09-01

    Full Text Available This paper reviews the definition and composition of paprika oleoresin. The review covers recent research concerning the conventional extraction process that uses organic solvents (mainly hexane, legislation, innovation, patents, applications, and perspectives in developing countries. The conventional process includes the extraction of the oleoresin usually with hexane as solvent, the miscella and meal disolventization, and a subsequent oleoresin degumming. The paprika oleoresin is used as additive colorant and is composed by esterified fatty acids such as the linoleic or the linolenic acids. This oleoresin and its components (carotenoids, capsaicinoids, and tocopherols, extracted under different conditions, are used in formulating nutraceutical, colorants and pharmaceuticals. The paprika oleoresin can become soluble by microencapsulation by mixing with gelatin or arabic gum. Paprika oleoresin extraction has future in Africa and iberoamerican countries.Se revisa la definición y componentes de la oleorresina de pimentón (ORP. La revisión cubre también recientes investigaciones en el proceso de obtención convencional mediante disolventes orgánicos (principalmente hexano, legislación, innovaciones, patentes, aplicaciones, y perspectivas en países en vías de desarrollo. El proceso convencional incluye una extracción habitualmente con hexano, y una posterior desolventización de la miscela y de la harina, con una depuración de la ORP posterior. La ORP se usa como aditivo colorante y está compuesta principalmente por ácidos grasos esterificados como el linoleico o linolénico. Tanto la ORP como sus componentes (carotenoides, capsaicinoides y tocoferoles, extraídos en diferentes condiciones, son utilizados en la formulación de nutracéuticos, colorantes y farmacopea. La ORP se puede hacer hidrosoluble añadiendo tensoactivos o mediante microencapsulación con mezclas con gelatina o goma arábiga. La extracción de ORP tiene futuro tanto

  10. Application of a hydrodynamic model to a coastal zone; Aplicacion de un modelo hidrodinamico en una zona costera

    Energy Technology Data Exchange (ETDEWEB)

    Rendon-Villalobos, J. Rodolfo; Vicente-Vidal, Francisco; Vicente-Vidal, Victor M [Centro de Investigaciones en Ciencia Aplicada y Tecnologia Avanzada, Cuernavaca, Morelos, Mexico (Mexico)

    1999-09-01

    This study describes the results of a numerical simulation of the hydrodynamic behavior of cooling water discharged into the sea from the Tuxpan Power Plant under two different meteorological and oceanographic conditions: case 1, southwesterly variable winds with an average velocity of 3 m s{sup -}1 and case II, northwesterly variable winds with an average velocity of 11.1 m s{sup -}1. The numerical simulations were made using a three-dimensional hydrodynamic model of coastal circulation and heat exchange. The southerly winds induce a sea surface circulation towards the north, which moves the discharged warm water away from the intake. The northerly winds, however, drive the hydrothermal effluent towards the intake. Comparisons between the numerical simulation results and field data show that the model correctly predicts the surface diffusion and dispersion of the hydrothermal effluents measured August 18 to 21, 1992 (case I) and November 24 to 27, 1992 (case II). The model predicts the extent of the areas impacted with cooling water with a precision of {+-}11%. For all the cases analyzed, the real size of the impacted areas that might have adverse effects on the marine ecosystems was not greater than 100 m{sup 2}. Thus, these possible adverse effects are considered to be of local significance only. The simulated vertical profiles of temperature show that the discharged cooling water remains mostly on the surface of the receiving water mass and reaches a maximum depth of 3.5 m. [Spanish] Este estudio describe los resultados de la simulacion numerica de comportamiento hidrodinamico de la descarga al mar del agua de enfriamiento de la Central de Potencia Tuxpan, bajo dos distintas condiciones ambientales meteorologicas y oceanograficas: caso I, viento variable de direccion del suroeste con intensidad promedio de 3 m s-1, y caso II, viento variable del noroeste con intensidad promedio de 11.1 m s-1. Las simulaciones numericas se realizaron mediante un modelo

  11. Colloquium on Central Asia

    International Nuclear Information System (INIS)

    2005-01-01

    This colloquium on Azerbaijan was organized by the direction of international relations of the French Senate and the French center of foreign trade (CFCE). This document gathers the interventions of the participants and the debates with the audience following these interventions. The topics treated concern: - the present day political-economical situation of Central Asia countries (problem of borders, relations with Russia and China); - the economies of Central Asia countries: short term problems and medium-term perspectives; - the relations with the European Union (political, economical, trade and investments, perspectives); - the European energy stakes of Caspian sea (oil and gas reserves, development of hydrocarbon resources, exploitation and transport constraints, stakes for Europe and France); - TotalFinaElf company in Central Asia (Kazakhstan, Azerbaijan, enclavement problem); - the economical impacts of the TRACECA pathway (Transport Corridor Europe Caucasus Asia). (J.S.)

  12. The Naive Central Banker

    Directory of Open Access Journals (Sweden)

    Marcelo de Carvalho Griebeler

    2015-09-01

    Full Text Available There has been in some countries a trend of assigning other functions to central banks besides price stability. The most suggested function to be added to monetary authority’s obligations is to pursue economic growth or full employment. In this paper we characterize the behavior and analyse the optimal monetary policy of, what we call, a naive central banker. We describe the naive behavior as one that does face the inflation-unemployment trade-off, but it tries to minimize both variables simultaneously. Our findings, both under discretion and commitment, indicate that the naive central banker delivers lower expected inflation and inflation variance than the benchmark behavior whenever the economy is rigid enough. However, the degree of conservativeness also affects this result, such that the less conservative the naive policymaker, the more rigidity is necessary.

  13. The central nervous system

    International Nuclear Information System (INIS)

    Holmes, R.A.

    1984-01-01

    The first section presents a comprehensive evaluation of radionuclide imaging of the central nervous system and provides a comparison of the detection accuracies of radionuclide imaging (RNI) and XCT in certain lesions, realizing that the XCT results may vary when radiocontrast or newer generation XCT scanners are used. Although conventional radionuclide imaging of the central nervous system has experienced no significant changes over the last 7 years except for mild refinements, a new section has been added on positron emission tomography (PET). Most positron radiopharmaceuticals passively cross the intact blood-brain barrier, and their localization has catalyzed renewed interest in our ability to metabolically study and obtain images of the central nervous system. The section on radionuclide cisternography has been rewritten to reflect present day practice and the wider application of XCT in describing conditions affecting the ventricular system

  14. Central pancreatectomy without anastomosis

    Directory of Open Access Journals (Sweden)

    Pahuja Anil

    2009-08-01

    Full Text Available Abstract Background Central pancreatectomy has a unique application for lesions in the neck of the pancreas. It preserves the distal pancreas and its endocrine functions. It also preserves the spleen. Methods This is a retrospective review of 10 patients who underwent central pancreatectomy without pancreatico-enteric anastomosis between October 2005 and May 2009. The surgical indications, operative outcomes, and pathologic findings were analyzed. Results All 10 lesions were in the neck of the pancreas and included: 2 branch intraductal papillary mucinous neoplasms (IPMNs, a mucinous cyst, a lymphoid cyst, 5 neuroendocrine tumors, and a clear cell adenoma. Conclusion Central pancreatectomy without pancreatico-enteric anastomosis for lesions in the neck and proximal pancreas is a safe and effective procedure. Morbidity is low because there is no anastomosis. Long term endocrine and exocrine function has been maintained.

  15. SOCRATES Invades Central Europe

    Directory of Open Access Journals (Sweden)

    Joseph Slowinski

    1998-04-01

    Full Text Available The objective of this article is to explore the current reality faced by higher education students in Central and Eastern Europe and to draw out the implications of this current reality for policy makers in the future. In the article, I explore the influence of transnational corporations' training programs on education as it currently pertains to Central and Eastern European higher education and employment. In addition, multinational corporate entities exercise influence on European Union policy through the role of lobby organizations and activities. I explore the influence of these practices on education with an emphasis on the emerging importance of Western language skills. In addition, I focus on the European Union and its efforts to expand into Central and Eastern Europe in order to provide a focal point for analysis.

  16. Central Bank independence

    Directory of Open Access Journals (Sweden)

    Vasile DEDU

    2012-08-01

    Full Text Available In this paper we present the key aspects regarding central bank’s independence. Most economists consider that the factor which positively influences the efficiency of monetary policy measures is the high independence of the central bank. We determined that the National Bank of Romania (NBR has a high degree of independence. NBR has both goal and instrument independence. We also consider that the hike of NBR’s independence played an important role in the significant disinflation process, as headline inflation dropped inside the targeted band of 3% ± 1 percentage point recently.

  17. Atmospheres of central stars

    International Nuclear Information System (INIS)

    Hummer, D.G.

    1978-01-01

    The author presents a brief summary of atmospheric models that are of possible relevance to the central stars of planetary nebulae, and then discusses the extent to which these models accord with the observations of both nebulae and central stars. Particular attention is given to the significance of the very high Zanstra temperature implied by the nebulae He II lambda 4686 A line, and to the discrepancy between the Zanstra He II temperature and the considerably lower temperatures suggested by the appearance of the visual spectrum for some of these objects. (Auth.)

  18. Centralized mouse repositories.

    Science.gov (United States)

    Donahue, Leah Rae; Hrabe de Angelis, Martin; Hagn, Michael; Franklin, Craig; Lloyd, K C Kent; Magnuson, Terry; McKerlie, Colin; Nakagata, Naomi; Obata, Yuichi; Read, Stuart; Wurst, Wolfgang; Hörlein, Andreas; Davisson, Muriel T

    2012-10-01

    Because the mouse is used so widely for biomedical research and the number of mouse models being generated is increasing rapidly, centralized repositories are essential if the valuable mouse strains and models that have been developed are to be securely preserved and fully exploited. Ensuring the ongoing availability of these mouse strains preserves the investment made in creating and characterizing them and creates a global resource of enormous value. The establishment of centralized mouse repositories around the world for distributing and archiving these resources has provided critical access to and preservation of these strains. This article describes the common and specialized activities provided by major mouse repositories around the world.

  19. Multicultural Central Asia.

    Science.gov (United States)

    Boyle, Eric D.

    This article addresses the multicultural aspect of Central Asia in response to the discussion on diversity in U.S. classrooms. Many areas of the world are more diverse than the U.S., and these areas experience successes and failures with many of the same issues the U.S. is currently struggling with. Comparing the U.S. diversity debate with similar…

  20. Testing for central symmetry

    NARCIS (Netherlands)

    Einmahl, John; Gan, Zhuojiong

    Omnibus tests for central symmetry of a bivariate probability distribution are proposed. The test statistics compare empirical measures of opposite regions. Under rather weak conditions, we establish the asymptotic distribution of the test statistics under the null hypothesis; it follows that they