What we don't hear much about, and what is harder to place, is the slower type of development".
In the faster type, called longitudinal, dilational, or irrotational waves, the particle motion is in the same direction as that of wave propagation; in the slower type, called transverse, shear, or rotational waves, it is perpendicular to the propagation direction.
Air Vice-Marshal Stuart Atha, air component commander for Olympics air security, said: "What we will have is a plan that has many levels to it which will allow us to deal at one end - which is that 9/11-type attack - perhaps down to the lower and the slower type of threat that we may face.
He explained: "It's an air threat, really categorised in two ways, the sort of 9/11 threat everyone knows about, and also for the lower, slower type of target which might pop up closer to the Olympic Park, which we would need to intervene".
Although phylogenetic analysis supports a slower Type II evolutionary mode for R2GHs from DM, RH and HB, this conclusion is complicated by the relative evolutionary distance between different genotypes in the two sections of the tree described above.
Thus, although we can definitively say that R2GHs from this specific South American background have experienced the slower Type II evolutionary mode, we hesitate to extend this to other species of similar geographic origin.
