1,333 research outputs found

    DETERMINATION OF VITAMINS A, E AND C IN MILK AS IMPROVERS OF ITS ANTIOXIDANT ACTIVITY

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    As a part of food and feed, nutrients including proteins, fats, carbohydrates, minerals, vitamins and water serve to meet animal physiological needs, maintain basal metabolism and reproduction, and the productive needs of milk production. Antioxidants have important role in inhibition of oxidative processes not only in living organisms, but also in food and feed preventing their oxidation and degradation. In this study determined were vitamins A, E and C in cow milk from three production farms as nutrients that increase the effect of antioxidant activity in caw milk. Vitamin A (Retinol) and vitamin E (Tocopherol) has analyzed by HPLC technique, using Perkin Elmer apparatus with pump: series 200LC, auto sampler, ISS - 200, detector LC - 135 / LC -235 C DA. Vitamin C (Ascorbic acid) was analyzed spectrophotometrically (Spectroquant Pharo 300 - Merck) at 520 nm. Vitamins A and E have shown higher values in samples of raw milk compared to those determined in pasteurized milk. The determined values of vitamin A, E and C in investigated milk samples were in agreement with the literature data, and they have shown statistical significance of difference in concentrations of some particular vitamins

    Caracterización del proceso de decisión de compra de leche en la Región de La Araucanía, Chile

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    Published by Asociación de Economistas Agrarios de ChileConjoint analysis, Fluid milk, Purchase behavior., Consumer/Household Economics, Marketing,

    Personality predicts the propensity for social learning in a wild primate.

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    Copyright: 2014 Carter et al.Open Access Article. Distributed under Creative Commons CC-BY 3.0Social learning can play a critical role in the reproduction and survival of social animals. Individual differences in the propensity for social learning are therefore likely to have important fitness consequences. We asked whether personality might underpin such individual variation in a wild population of chacma baboons (Papio ursinus). We used two field experiments in which individuals had the opportunity to learn how to solve a task from an experienced conspecific demonstrator: exploitation of a novel food and a hidden item of known food. We investigated whether the (1) time spent watching a demonstrator and (2) changes in task-solving behaviour after watching a demonstrator were related to personality. We found that both boldness and anxiety influenced individual performance in social learning. Specifically, bolder and more anxious animals were more likely to show a greater improvement in task solving after watching a demonstrator. In addition, there was also evidence that the acquisition of social information was not always correlated with its use. These findings present new insights into the costs and benefits of different personality types, and have important implications for the evolution of social learning.Leakey FoundationAnimal Behavior Society (USA)International Primatological SocietyExplorers Club Exploration FundFenner School of Environment and SocietyNatural Environment Research Council (NERC

    Personality predicts the propensity for social learning in a wild primate

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    Social learning can play a critical role in the reproduction and survival of social animals. Individual differences in the propensity for social learning are therefore likely to have important fitness consequences. We asked whether personality might underpin such individual variation in a wild population of chacma baboons (Papio ursinus). We used two field experiments in which individuals had the opportunity to learn how to solve a task from an experienced conspecific demonstrator: exploitation of a novel food and a hidden item of known food. We investigated whether the (1) time spent watching a demonstrator and (2) changes in task-solving behaviour after watching a demonstrator were related to personality. We found that both boldness and anxiety influenced individual performance in social learning. Specifically, bolder and more anxious animals were more likely to show a greater improvement in task solving after watching a demonstrator. In addition, there was also evidence that the acquisition of social information was not always correlated with its use. These findings present new insights into the costs and benefits of different personality types, and have important implications for the evolution of social learning

    Videogames and sustainability : how gaming actions can potentially contribute to less waste actions

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    This thesis is based on the assumption that the challenge of waste management needs to be addressed within the sustainability framework where society takes part in the solution. People’s beliefs, attitudes and values are what, ultimately, make people behave the way they do. Therefore this thesis intends to study a potential way of changing these worldviews towards more sustainable ones by utilizing a common cultural practice; namely, the act of playing videogames. The study will be focused in the U.S. since the country is placed as the world’s leader of waste production, and it ranks among the top ten consumers of videogames globally. Videogames have had varying impacts on society and studies about their potential contribution to the sustainability science field have emerged in the past decade. Despite this, little research on their effectiveness or potential uses has been done. Accordingly, within this research, a literature review of such impacts and potentials was conducted, and a quasi-experimental study was carried out among a group of U.S. citizens. The study was designed based on the TORE model, an intervention-based behavioral model designed to influence people’s attitudes, employing a game called Garbage Dreams. The videogame was played in two different contexts using the computer as a platform. The participants were U.S. citizens with no special expertise on the environmental or videogames field between the ages of 11 to 79. Data was gathered, through observations and mainly by three surveys: previous to the game experience, after the game was played and a follow-up survey sent days later. The study found that a videogame has the potential to be considered a tool for addressing people’s attitudes towards the challenge of waste management; it demonstrated that a videogame was an enjoyable medium for presenting the topic of interest and it was capable of providing new knowledge to the players. However, the results are inconclusive as to whether or not participants effectively applied the knowledge gained to their daily lives. It is suggested that further studies be performed and include other videogame platforms such as the mobile phone, which was found to be the most used among study participants

    Programma 2013/2014

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    Migration of phthalates, alkylphenols, bisphenol A and di(2-ethylhexyl)adipate from food packaging

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    The migration of plastic components or additives from packaging to food can produce a risk for human health, in fact many of these plasticizers and additives are "Endocrine Distruptors", such as phthalates (PAEs), alkylphenols (APs), 2,2-bis(4-hydroxyphenyl)propane (bisphenol A or BPA) and di(2-ethylhexyl) adipate (DENA). The evaluation of some PAEs, some APs, BPA and DEHA levels in common food packaging (oil and natural tuna cans, marmalade cap, yogurt packaging, polystyrene dish, teat, bread bag, film, baby's bottle, aseptic plastic laminate paperboard carton and plastic wine top) was carried out by migration tests. Furthermore to evaluate the potential migration of plasticizers and additives from plastic wine tops, two extraction methods were used, one through incubation at 40 degrees C for 10 days and one by ultrasounds extraction. The simulants employed were distilled water, acetic acid at 3%, ethanol at 15% for wine top. The food simulant was extracted by solid phase extraction (SPE) and analyzed by GC-MS. Comparing these results with EU restrictions all samples showed contaminant migration lower than SML and OML established. Finally, about the comparison of two extraction methods, the extraction carried out for 10 days at 40 degrees C may be better than the other one in order to detect all compounds. (C) 2012 Elsevier Ltd. All rights reserved

    Quality Of Seeds Of Jatob√°-do-cerrado Processed And Stored In Diferents Forms

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    The preservation of the physical and chemical quality of jatob√°-do-cerrado seeds during processing and storage is essential to the restocking of vegetation in degraded areas. Since no scientific studies have analysed the optimal post-harvest conditions for jatob√°-do-cerrado seeds, this study aimed to evaluate the physical and chemical quality of jatob√°-do-cerrado seeds following different types of processing: with pulp, without pulp (scarification), without pulp (fermentation) and at different storage temperatures (10 and 23 ¬įC) and different packaging (tetrapack, paper, plastic, PET bottles and glass bottles), over six months. The physical and chemical constituents of jatob√°-do-cerrado seeds varied according to the packaging conditions. An increased storage time reduced the quality of the seeds. Seeds with pulp showed better physical characteristics during storage. The pulping processing of seeds by mechanical scarification increased the acidity and ash content, but led to the highest percentage of crude protein during storage at 23 ¬įC. The fermentation method of seed pulping positively affected seed quality during storage at 10 ¬įC. Permeable packaging (paper bags and tetrapack) led to a greater reduction in seed quality than that in glass bottles, PET bottles or plastic bags. The best conditions for the processing of jatob√°-do-cerrado seeds was fermentation and the best storage condition was in waterproof packaging (glass or PET bottles).37266568

    Focal Firms as Technological Gatakeepers within Industrial Districts Knowledge Creation and Dissemination in the Italian Packaging Machinery Industry

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    Despite the diffusion of communication tools and boundary spanning technologies, knowledge flows in innovation processes retain a distinct localized nature in many industries and geographical clusters emerge as critical areas to foster technological diffusion. In this paper we focus on the role of focal firms in industrial clusters as ‚Äúgatekeepers‚ÄĚ introducing external technological novelties in the cluster and enacting new useful knowledge production locally, thus enhancing international competitive capabilities of all firms in the cluster. We analyze a longitudinal dataset of 720 patents 1 Corresponding Author www.druid.dk granted by USPTO between 1990 and 2003 to firms in the automatic packaging machinery industrial district of Emilia-Romagna in Northern Italy, and a matched-sample to control for the uneven geographical distribution of R&D and patenting activities. Our results show that firms within the cluster use local knowledge to a greater extent and more rapidly than knowledge from the outside than it would be expected given the geographic distribution of innovative activity in the industry. Moreover, focal firms use external knowledge to a greater extent than other firms operating in the cluster, and other (non focal) firms within the cluster use knowledge from focal firms to a greater extent than would be expected given the geographic distribution of innovative activity in the industry. Implications for research on the geographical distribution of innovation activities are discussed.Innovation processes, Knowledge flows, Geographical clusters
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