نتایج جستجو برای: food structure
تعداد نتایج: 1816144 فیلتر نتایج به سال:
Ecological networks exhibit non-random structural patterns, such as modularity and nestedness, which determine ecosystem stability with species diversity and connectance. Such structure-stability relationships are well known. However, another important perspective is less well understood: the relationship between the environment and structure. Inspired by theoretical studies that suggest that n...
Stable isotope ratios (typically of carbon and nitrogen) provide one representation of an organism's trophic niche and are widely used to examine aspects of food web structure. Yet stable isotopes have not been applied to quantitatively characterize community-wide aspects of trophic structure (i.e., at the level of an entire food web). We propose quantitative metrics that can be used to this en...
Sustainable product innovation is a key issue facing agri-food companies to maintain and increase their competitiveness. Based on sample of 320 international for the period 2002–2017, this paper analyzes role that ownership structure capital play with regard sustainable as well whether these financing decisions differ depending firm's structure. The results indicate family-owned firms show an a...
Patterns in food-web structure have frequently been examined in static food webs, but few studies have attempted to delineate patterns that materialize in food webs under nonequilibrium conditions. Here, using one of nature's classical nonequilibrium systems as the food-web database, we test the major assumptions of recent advances in food-web theory. We show that a complex web of interactions ...
Improving access to food and nutrition data. 2. A language for the description of foods in databases
This paper presents a highly flexible and powerful language for the description of foods in food composition and food use databases and for the precise specification of recipes and food standards. The language is the conceptual foundation for a proposed master database of food descriptions which would offer vastly improved capabilities for retrieval and combination of data from food composition...
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