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| Registros recuperados: 457 | |
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| Sánchez-Monge, R.; Salcedo, G.. |
| The occurrence of homologous proteins in foods, pollen and latex is the molecular basis of the plant sources’ allergenic cross-reactivity. However, there is not a generic cross-reactivity. Each allergic patient is sensitized to particular allergens and even to particular IgE-binding epitopes. Molecular studies on the main panallergens may explain the major plant-food, pollen and latex syndromes. Some examples of the bestcharacterized plant panallergens are presented. Novel technologies on recombinant proteins and microarrayed allergens will provide allergen-sensitization profiles, associated to food allergies and cross-reactivity, that will enable the diagnosis and prediction of cross-reactions as well as individual treatment of these pathologies. |
| Tipo: Conference proceedings |
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| Ano: 2005 |
URL: http://library.wur.nl/ojs/index.php/frontis/article/view/1062 |
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| Pfaff, A.; Kerr, S.; Cavatassi, R.; Davis, B.; Lipper, L.; Sanchez, A.; Timmins, J.. |
| We review many theoretical predictions that link poverty to deforestation and then examine poverty’s net impact empirically using multiple observations of all of Costa Rica after 1960. Countrywide disaggregate (district-level) data facilitate analysis of both poverty’s location and its impact on forest. If the characteristics of the places the poor live are not controlled for, then poverty’s impact is confounded with differences between poorer and less poor areas and we find no significant effect of poverty. Using our data over space and time to control for effects of locations’ differing characteristics, we find that the poorer are on land whose relative quality discourages forest clearing, such that with these controls the poorer areas are cleared more.... |
| Tipo: Conference proceedings |
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| Ano: 2008 |
URL: http://library.wur.nl/ojs/index.php/frontis/article/view/1577 |
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| Ferreira, H.S.; Botequilha Leitão, A.. |
| The global freshwater crisis demands new forms of action if further environmental and social impacts are to be avoided. Traditional sectoral and technologically based approaches have proven to be ineffective in addressing this crisis, since they disregard the multiple and complex roles of water in the landscape, and subsequently the need for cooperation across the many sectors involved in water-resources planning and management, including institutions and citizens. As an invisible resource, groundwater has been particularly affected by the traditional sectoral approach. Moving towards sustainability demands integration at multiple levels (e.g. land, water, social-natural, surface-underground), which in turn calls for transdisciplinarity between academic... |
| Tipo: Conference proceedings |
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| Ano: 2005 |
URL: http://library.wur.nl/ojs/index.php/frontis/article/view/1114 |
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| Van Boekel, M.A.J.S.. |
| This paper starts with an overview of some typical food-science problems. In view of the development of safe and healthy food, the use of mathematical models in food science is much needed and the use of statistics is therefore indispensable. Because of the biological variability in the raw materials on the one hand and the complex nature of foods on the other hand food-science problems are characterized by a high degree of uncertainty as well as variability. Consequently, when dealing with these problems Bayesian statistics could be very helpful; however, it is hardly used at all. This paper discusses some possible applications concerning the modelling of food quality and food safety. It is concluded that a Bayesian approach could be quite useful and its... |
| Tipo: Conference proceedings |
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| Ano: 2004 |
URL: http://library.wur.nl/ojs/index.php/frontis/article/view/855 |
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| Fresco, L.O.. |
| The current paradigm shift from supply-oriented and quantity-driven agriculture towards an understanding of demand- and market-driven food chains is leading to greater attention for quality aspects and environmental concerns. Rapid urbanization and increases in purchasing power cause important changes in dietary patterns that will restructure agriculture in the world. This affects the food chain in terms of the types of products that are produced and the kind of research that is required. For meeting global food demand, the volume of agricultural production will have to double through a process of sustainable intensification. Food safety has become a key factor in trade negotiations and bio-security is absolutely essential to all consumers in the world.... |
| Tipo: Conference proceedings |
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| Ano: 2006 |
URL: http://library.wur.nl/ojs/index.php/frontis/article/view/984 |
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| Schouten, R.E.; Tijskens, L.M.M.; Van Kooten, O.; Jongbloed, G.. |
| Keeping-quality of individual cucumbers is limited by the green colour; the keeping-quality of batches of cucumbers is limited by the time it takes before 5% of the cucumbers in the batch reach a predefined colour limit. From literature concerning the synthesis and degradation of chlorophyll and a published colour model (Schouten, Tijskens and Van Kooten 2002) it is known that colour behaviour of individual cucumbers depends on the concentration of protochlorophyllide (Pchl), at harvest. Here a model for the synthesis and degradation of Pchl is proposed for individual cucumbers, assuming that light conditions during growth are a major factor for Pchl synthesis. Subsequently, this individual Pchl model is expanded to a batch model that describes the... |
| Tipo: Conference proceedings |
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| Ano: 2004 |
URL: http://library.wur.nl/ojs/index.php/frontis/article/view/859 |
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| Müller, J.; Heindl, A.. |
| Drying is the most common method of medicinal plant preservation and, due to high investment and energy costs, drying is also a large expense in medicinal plant production. Drug quality and consequently earnings are significantly influenced by the drying regime. Conventionally, low drying temperatures between 30 and 50°C are recommended to protect sensitive active ingredients, but the decelerated drying process causes a low capacity of drying installations. Therefore, the objective of research in medicinal plant drying is to find the optimum drying temperature for various medicinal plant species in terms of quality and drying costs. Investigations on Salvia officinalis are presented as an example. Optimal drying temperature was 50°C, because quality... |
| Tipo: Conference proceedings |
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| Ano: 2006 |
URL: http://library.wur.nl/ojs/index.php/frontis/article/view/1236 |
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| Drewes, A.; Silbernagel, J.. |
| Culture, cultivation and landscape change form the basis of this integrative study in the Upper Great Lakes region of North America. Declining across its native range, natural wild rice provides sustenance as a food source and limited economic benefits to both Native Americans and Americans of European descent. Relationships to wild rice however differ greatly between the two cultures as the Native Americans have historically considered wild rice a sacred gift, while non-Indians view it more strictly as a resource. Cultivation takes place using a variety of methods, regulated by policies that are complicated by the national, tribal, state and provincial borders that bisect the region. The authors propose an integrative approach to studying this changing... |
| Tipo: Conference proceedings |
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| Ano: 2005 |
URL: http://library.wur.nl/ojs/index.php/frontis/article/view/1133 |
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| Lanzaro, G.C.; Tripet, F.. |
| The success of genetic-control programmes aimed at introducing genes into wild Anopheles gambiae populations depends on our understanding of the genetic structure of these populations. Population-genetic studies are required for identifying discrete population groups across Africa, determining their geographical distribution and evaluating the degree to which they may be reproductively isolated. Population studies are also needed to estimate the rate at which genes may spread within and between populations at various spatial scales and to identify biological and physical features of the environment that may interfere with their movement. Studies of the mechanisms of reproductive isolation between molecular/chromosomal forms of An. gambiae can be used to... |
| Tipo: Conference proceedings |
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| Ano: 2004 |
URL: http://library.wur.nl/ojs/index.php/frontis/article/view/844 |
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| Fiers, M.W.E.J.; Kleter, G.A.; Peijnenburg, A.A.C.M.; Nijland, H.; Nap, J.P.; Van Ham, R.C.H.J.. |
| AllermatchTM (http://allermatch.org) is a novel web tool for the efficient and standardized prediction of potential allergenicity of proteins according to the current recommendations of the FAO/WHO Expert Consultation, as outlined in the Codex alimentarius. A query amino-acid sequence is compared against the Allermatch- Allergen database based on current SwissProt and WHO-IUIS allergen lists. The web tool uses a sliding window to identify stretches of 80 amino acids with more than 35% similarity, or identical small stretches of at least six amino acids. The outcome of the analyses is presented in a concise format. AllermatchTM is likely to contribute to improved, transparent and more consistent analyses of potential allergenicity of genetically modified... |
| Tipo: Conference proceedings |
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| Ano: 2005 |
URL: http://library.wur.nl/ojs/index.php/frontis/article/view/1068 |
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| Oenema, O.; Vellinga, T.V.; Van Keulen, H.. |
| This chapter reviews nutrient management of intensively managed grasslands used for dairy farming in The Netherlands, with emphasis on research but with linkages to practice. Firstly, it provides an overview of the changes that have taken place in nutrient management research and practice during the 20th century. Secondly, it presents the current concept of nutrient management with application to grazed grassland. Finally, it discusses nitrogen (N) management of pastures and the tools to improve N management at operational level. Nutrient management under grazing has evolved from merely optimizing manure and fertilizer applications for high herbage yield towards improving nutrient use efficiency at farm level whilst maintaining productivity. Nutrient... |
| Tipo: Conference proceedings |
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| Ano: 2007 |
URL: http://library.wur.nl/ojs/index.php/frontis/article/view/1246 |
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| Yin, X.; Struik, P.C.. |
| The response of the whole crop to environmental conditions is a critical factor in agriculture. It can only be understood if the organization of the crop system is taken into account. A popular view in modern science is that genomics (and other ‘omics’) will provide knowledge and tools to allow the characteristics of the crop to be altered for improved actual and potential crop yields, increased resource use efficiency and enhanced crop system health. As a result of this view, (molecular) plant systems biology has been considered as an approach to assist crop improvement for increased production, via modelling ‘how things work’ in (sub-)cellular units. However, phenotypes at the crop level, for example, as expressed in grain yields, are extremely complex,... |
| Tipo: Conference proceedings |
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| Ano: 2007 |
URL: http://library.wur.nl/ojs/index.php/frontis/article/view/1296 |
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| Ingenbleek, P.. |
| Although the marketing discipline originates from agricultural economics, it currently moves to a new logic that is marked by, among other things, customer value, customer satisfaction, relationships, market orientation and resource-based theories. This article uses this evolving logic in marketing to examine the problem of sharing financial rewards in agricultural supply chains. Building on resource-advantage theory it is suggested that the potential reward that firms may derive from participating in a supply chain depends on the competitive position of the chain as a whole and on the competitive position of the individual firm within the chain. To understand what its contribution to the chain is worth, the firm should be able to quantify relative... |
| Tipo: Conference proceedings |
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| Ano: 2006 |
URL: http://library.wur.nl/ojs/index.php/frontis/article/view/1144 |
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| Hobbs, J.E.. |
| Improving food safety, reducing the impacts of food safety problems, and providing a means to verify food quality attributes are driving the development of traceability initiatives in agri-food systems. Numerous and varied examples exist, from regulatory traceability initiatives, to industry-wide livestock traceability programmes, to individual supply-chain systems that combine traceability with quality verification. This paper explores the economic functions of traceability, examining the extent to which traceability can bolster liability incentives for firms to practice due diligence. The extent to which consumers value traceability per se, versus verifiable quality assurances delivered through traceability, is evaluated empirically using survey and... |
| Tipo: Conference proceedings |
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| Ano: 2006 |
URL: http://library.wur.nl/ojs/index.php/frontis/article/view/1143 |
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| Goodwin, B.K.; Pigott, N.E.. |
| Asiatic citrus canker is an infectious disease that is a significant hazard to commercial citrus production in Florida. Our paper examines models of the risks of citrus canker transmission. The State of Florida currently has an active inspection program that checks every commercial grove several times each year. We use data from over 338,000 inspections over the 1998-2004 period. Simple models describing the risks of infection are used to evaluate risks and associated indemnity/insurance fund contribution rates. The risks are estimated for annual contracts which would pay producers a pre-specified indemnity in the event that their grove is found to be infected with canker |
| Tipo: Conference proceedings |
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| Ano: 2007 |
URL: http://library.wur.nl/ojs/index.php/frontis/article/view/1282 |
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| Skidmore, A.K.; Ferwerda, J.G.. |
| The distribution of food is an important predictor for the distribution and density of herbivores in an ecosystem. Determining the distribution and densities of resource quantity and quality in space and time is therefore a crucial step towards understanding the spatial arrangement of herbivores. In recent years remote sensing has become the tool of choice for producing high spatial-resolution impressions of the variability of the landscape, and in particular land cover. Remote sensing is slowly moving away from mapping the surface into discrete land-cover classes. More and more, it is now used to produce highly accurate probability maps of presence, depicting the percentage of individual pixels covered with a certain surface element. This more closely... |
| Tipo: Conference proceedings |
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| Ano: 2007 |
URL: http://library.wur.nl/ojs/index.php/frontis/article/view/1538 |
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| Romero, M.R.; De Groot, W.T.. |
| A transition from slash-and-burn farming to sustainable land use is essential for the prevention of poverty and the conservation of the rainforest in the Philippine uplands. The key of this transition is that farmers invest in the quality of their land, e.g., through terracing, contour bunding, irrigation facilities, agroforestry or tree plantation. In their turn, these investments depend on a variety of factors, such as the households’ socioeconomic and agro-ecological conditions. This chapter presents an econometric analysis of the determinants of households’ investments in land quality in the Philippines. A logit model of investments is formulated using the information generated from an in-depth household survey of 104 households randomly selected in... |
| Tipo: Conference proceedings |
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| Ano: 2008 |
URL: http://library.wur.nl/ojs/index.php/frontis/article/view/1580 |
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| Slingerland, M.; Díaz Gonzalez, E.. |
| Costa Rica and Panama both produce only small volumes of organic cacao. Some cocoa producers started production of organic banana. APPTA has to cope with market instability due to excess supply and with low local production due to biological threats. APPTA has to find a reliable buyer and either to increase the volume of cacao or to pool its production with the production realized by COCABO in Panama. This latter option will lead to a number of associated challenges such as harmonization of quality, organizing logistics, tracking and tracing, elaborating contracts between cooperatives etc. Developing new commercialization channels towards Europe reveals three options: APPTA sells beans directly to a Dutch buyer; APPTA sells beans to a Costa Rican processor... |
| Tipo: Conference proceedings |
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| Ano: 2006 |
URL: http://library.wur.nl/ojs/index.php/frontis/article/view/981 |
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| Registros recuperados: 457 | |
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