Only a month earlier, both had been pointing hopefully to some signs that things might be improving after three years of rapidly deteriorating on-time performance.
Viral databases of nucleotide sequences offer an additional opportunity because RNA viruses evolve rapidly on short time scales.
Quite rapidly on geologic time scales, as evidenced by the rich store of intraspecific diversity found in deglaciated areas such as Puget Sound and British Columbia.
This is consistent with comproportionation and disproportionation reactions achieving equilibrium rapidly, on the time scale of the EPR observations, with an accompanying autoxidation reaction removing the radical.
The model considers the branches to be stable, but actually the branches and the filaments are actually turning over rapidly on the time scale of this figure (as shown by the simulations of Berro, 2010).
However, we know from past experience that the secular variation is not constant in time and can change rapidly on a time-scale of perhaps only 1 or 2 years as a result of rapid (e.g., Olsen et al. 2006; Lesur et al. 2008) or strong acceleration (e.g., Chulliat et al. 2010) thus making extrapolation short-sighted and a poor predictor at the end of the 5-year interval.
On the basis of the observed decrease in reactivity of PM collected along an upwind downwind trajectory in the Los Angeles air basin, it appears that, at least in that air basin at that time, photochemical aging occurred rapidly, on a time-scale of a few hours during daytime, and that little or no additional heterogeneous reactions would occur for additional atmospheric transport times.
Rather than the stereotype rough sleeper - the gaunt, grizzly wino in tattered clothes - he found people who had to their surprise been tripped up by joblessness, eviction and relationship breakdown and had fallen rapidly on hard times.
There are two possible explanations for the lack of correlation between replication timing and sequence divergence between the two related yeast species: at longer times, other features exert stronger control over which mutations can survive or replication timing may change rapidly on an evolutionary time scale.
Much of it is below sea level, in a sort of bowl, and he said that a climatic warming could cause the whole thing to degrade rapidly on a geologic time scale, leading to a possible rise in sea level of 16 feet.
