March 28, 2011 to April 20, 2011
Europe/Stockholm timezone

Metabolic networks, information, a null model and evolution

Mar 30, 2011, 9:00 AM


Prof. Petter Minnhagen (Umeå University)


A simple general null-model, the Ikea network, is described and its properties are investigated. This network is argued to be the appropriate network for a random assembling of links, such that both which link is attached to which and the time-order are all distinct random possibilities. From this point of view it is the opposite of preferential attachment. This network is discussed in the context of metabolic networks, where the metabolism of an organism is reduced to a network of substances. The striking agreement between the Ikea network and the metabolic networks implies that the null model catches the overall features. Using the network structure measures clustering and assortativity, a small difference is nevertheless identified and is argued to imply a possible evolutionary pressure. This difference is manifested in a slight difference in the degree distribution.

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