خيارات البحث
النتائج 11 - 20 من 6,038
Towards a water and food secure future: critical perspectives for policy-makers النص الكامل
2016
The aim of this paper is to provide policy-makers with a helpful overview of the technical and economic aspects of water use in agriculture, with particular emphasis on crop and livestock production. Through 2050, in many countries, agriculture will remain an important determinant of economic growth, poverty reduction, and food security, even as, over time, the proportion of agricultural revenue in national gross income declines. Water use in agriculture will remain substantial, irrigated areas will expand and competition for water will increase in all sectors. Most likely, overall supplies of land and water will be sufficient to achieve global food production goals in 2050; although poverty and food insecurity will remain pressing challenges in several regions and countries. Thus, the focus of this report is on the regional and national aspects of food security.
اظهر المزيد [+] اقل [-]Review of water control technologies in the FAO programmes for food security النص الكامل
2011
Microbiological examination methods of food and water | Manual de metódos de análise microbiológica de alimentos e água. English
2018
Silva, Neusely da
Microbiological Examination Methods of Food and Water (2nd edition) is an illustrated laboratory manual that provides an overview of current standard microbiological culture methods for the examination of food and water, adhered to by renowned international organizations, such as ISO, AOAC, APHA, FDA and FSIS/USDA. It includes methods for the enumeration of indicator microorganisms of general contamination, indicators of hygiene and sanitary conditions, sporeforming, spoilage fungi and pathogenic bacteria. Every chapter begins with a comprehensive, in-depth and updated bibliographic reference on the microorganism(s) dealt with in that particular section of the book. The latest facts on the taxonomic position of each group, genus or species are given, as well as clear guidelines on how to deal with changes in nomenclature on the internet. All chapters provide schematic comparisons between the methods presented, highlighting the main differences and similarities. This allows the user to choose the method that best meets his/her needs. Moreover, each chapter lists validated alternative quick methods, which, though not described in the book, may and can be used for the analysis of the microorganism(s) dealt with in that particular chapter. The didactic setup and the visualization of procedures in step-by-step schemes allow the user to quickly perceive and execute the procedure intended. Support material such as drawings, procedure schemes and laboratory sheets are available for downloading and customization. This compendium will serve as an up-to-date practical companion for laboratory professionals, technicians and research scientists, instructors, teachers and food and water analysts. Alimentary engineering, chemistry, biotechnology and biology (under)graduate students specializing in food sciences will also find the book beneficial. It is furthermore suited for use as a practical/laboratory manual for graduate courses in Food Engineering and Food Microbiology.
اظهر المزيد [+] اقل [-]Oil-in-water food emulsions stabilized by tuna proteins | Emulsiones alimentarias aceite-en-agua estabilizadas con proteínas de atún النص الكامل
2010
Ruiz Márquez, D., Universidad de Huelva (España). Facultad de Ciencias Experimentales | Partal, P., Universidad de Huelva (España). Facultad de Ciencias Experimentales | Franco, J.M., Universidad de Huelva (España). Facultad de Ciencias Experimentales | Gallegos, C., Universidad de Huelva (España). Facultad de Ciencias Experimentales
El presente trabajo se ha centrado en el desarrollo de emulsiones alimentarias aceite-en-agua estabilizadas con proteínas de atún. Específicamente, se ha analizado la influencia del método de conservación de las proteínas aisladas (liofilización, congelación) y de las condiciones de procesado seleccionadas sobre el comportamiento reológico y la microestructura de dichas emulsiones. Se han preparado emulsiones aceite en agua (con un contenido del 70% en peso de aceite) estabilizadas con proteínas de atún. La concentración de emulsionante usada ha sido 0,50% en peso. El comportamiento reológico de estas emulsiones no depende significativamente del método de conservación de la proteína empleado. Por otra parte, un aumento de la velocidad de agitación durante el proceso de manufactura de la emulsión da lugar a una disminución continua del tamaño medio de gota y a un aumento de las funciones viscoelásticas dinámicas, menos significativo a medida que aumenta dicha velocidad de agitación. | This work is focused on the development of o/w salad dressing-type emulsions stabilized by tuna proteins. The influence of protein conservation methods after the extraction process (freezing or liofilization) on the rheological properties and microstructure of these emulsions was analyzed. Processing variables during emulsification were also evaluated. Stable emulsions with adequate rheological and microstructural characteristics were prepared using 70% oil and 0.50% tuna proteins. From the experimental results obtained, we may conclude that emulsion rheological properties are not significantly affected by the protein conservation method selected. On the contrary, an increase in homogenization speed favours an increase in the values of the linear viscoelastic functions. Less significant is the fact that as agitation speed increases further, mean droplet size steadily decreases.
اظهر المزيد [+] اقل [-]Oil-in-water food emulsions stabilized by tuna proteins | Emulsiones alimentarias aceite-en-agua estabilizadas con proteínas de atún النص الكامل
2010
Ruiz-Márquez, D. | Partal, P. | Franco, J. M. | Gallegos, C.
Oil-in-water food emulsions stabilized by tuna proteins | Emulsiones alimentarias aceite-en-agua estabilizadas con proteínas de atún النص الكامل
2010
Ruiz-Márquez, D. | Partal, P. | Franco, J. M. | Gallegos, C.
This work is focused on the development of o/w salad dressing-type emulsions stabilized by tuna proteins. The influence of protein conservation methods after the extraction process (freezing or liofilization) on the rheological properties and microstructure of these emulsions was analyzed. Processing variables during emulsification were also evaluated. Stable emulsions with adequate rheological and microstructural characteristics were prepared using 70% oil and 0.50% tuna proteins. From the experimental results obtained, we may conclude that emulsion rheological properties are not significantly affected by the protein conservation method selected. On the contrary, an increase in homogenization speed favours an increase in the values of the linear viscoelastic functions. Less significant is the fact that as agitation speed increases further, mean droplet size steadily decreases. | El presente trabajo se ha centrado en el desarrollo de emulsiones alimentarias aceite-en-agua estabilizadas con proteínas de atún. Específicamente, se ha analizado la influencia del método de conservación de las proteínas aisladas (liofilización, congelación) y de las condiciones de procesado seleccionadas sobre el comportamiento reológico y la microestructura de dichas emulsiones. Se han preparado emulsiones aceite en agua (con un contenido del 70% en peso de aceite) estabilizadas con proteínas de atún. La concentración de emulsionante usada ha sido 0,50% en peso. El comportamiento reológico de estas emulsiones no depende significativamente del método de conservación de la proteína empleado. Por otra parte, un aumento de la velocidad de agitación durante el proceso de manufactura de la emulsión da lugar a una disminución continua del tamaño medio de gota y a un aumento de las funciones viscoelásticas dinámicas, menos significativo a medida que aumenta dicha velocidad de agitación.
اظهر المزيد [+] اقل [-]Oil-in-water food emulsions stabilized by tuna proteins النص الكامل
2010
D. Ruiz-Márquez | P. Partal | J. M. Franco | C. Gallegos
This work is focused on the development of o/w salad dressing-type emulsions stabilized by tuna proteins. The influence of protein conservation methods after the extraction process (freezing or liofilization) on the rheological properties and microstructure of these emulsions was analyzed. Processing variables during emulsification were also evaluated. Stable emulsions with adequate rheological and microstructural characteristics were prepared using 70% oil and 0.50% tuna proteins. From the experimental results obtained, we may conclude that emulsion rheological properties are not significantly affected by the protein conservation method selected. On the contrary, an increase in homogenization speed favours an increase in the values of the linear viscoelastic functions. Less significant is the fact that as agitation speed increases further, mean droplet size steadily decreases.
اظهر المزيد [+] اقل [-]Regeneración de agua y suelo y sus efectos en la alimentación | Reclamation of soil and water and its effect on food
1988
Antúnez de Mayolo R., Santiago E. (Santiago Erik Antúnez de Mayolo Rynning)
Interactions between water and EVOH food packaging films / Interacciones entre el agua y películas de EVOH para el envasado de alimentos النص الكامل
2000
Aucejo, S. | Catalá, R. | Gavara, R.
The transport of water in four EVOH copolymers commonly used in high barrier food packages was characterized through permeation (continuous flow) and gravimetric experiments at different rela tive humidities and 23 ± 2°C. Water sorption isotherms were fitted with the D'Arcy and Watts' equa tion. From these data, the value of the solubility coefficient (S, as defined by Henry's law) was deter mined and was found constant within a 0.2-0.75 water activity (a w) range. Water uptake at the same a w increased as the EVOH ethylene content decreased. The permeability coefficient (P) for water through EVOH was determined as a function of water activity. The permeability was constant within the range of 0.3-0.75 a w and decreased with EVOH ethylene content. At high relative humidities (a w > 0.75) the value of permeability increased by up to two orders of magnitude. In this range, the higher the ethylene content the lesser the value of P.
اظهر المزيد [+] اقل [-]Soil conservation and productivity | Soil and water conservation to prevent food shortage | Conservacion de suelos y agua para prevenir deficit de alimentos
1987
Pla Sentís, Ildefonso
Water for food النص الكامل
2008
Foarare, J. (ed.) | Swedish Research Council Formas, Stockholm (Sweden) eng
Food, man & water
1978
Food service directors and dietitians in many parts of the United States are having to cope with rationed water and use filtered water. Throughout the country, theEnvironmental Protection Agency reports that one third of our drinking water supply is contaminated. The water problem might well become more serious than the energy crisis. An in depth report on what has happened and what should be known about one of the nation's most urgent, but least accepted, problems is presented. Illustrative photographs and numerous tables accompany the report.
اظهر المزيد [+] اقل [-]