We next illustrate with an example how pathway (super) essentiality causes fragmentation of genotype networks, by demonstrating the existence of alternative essential pathways in different network components for metabolisms with 23 and 24 reactions.
The first thing that stands out is the stronger fragmentation of these networks.
To make matters worse, as digital sets become less expensive and more common, digital TV threatens a continuing fragmentation of the networks' audiences because it will effectively quintuple the number of channels available to the consumer.
Moreover, the fragmentation of mitochondrial networks induced by METH was found to be mediated by Drp1, a dynamin-related protein which regulates apoptosis-related fission, and inhibition of Drp1 activity by Drp1 siRNA also blocked METH-induced mitochondrial fragmentation (Fig. 5).
Low fertility may therefore result from the fragmentation of kin networks associated with modernization.
In other words, the fragmentation of genotype networks that we see for very small potential metabolisms, and that can constrain their evolution, is of little relevance for the evolution of free-living organisms.
This possibility is suggested by our analysis of central carbon metabolism, where metabolisms viable on 10 carbon sources must have at least 34 reactions, and fragmentation of genotype networks stops at 37 reactions.
The effective oxygen diffusivity is positively correlated to porosity (and its related parameters) and the surface area and shape of the voids, and negatively correlates to the number of voids and cells, as well as the number and length of branches in the void network and the degree of fragmentation of the network.
"The fragmentation of this network is immense, but you can bring it together," he says.
The timescale given by Eq. (14) corresponds to the timescale of the fragmentation of a network of radius r.
