Thus, from an evolutionary standpoint, HIV is not vector-borne because either the necessary genetic variation for such transmission has never arisen, or the necessary selective factors that would make such variants increase in frequency over the relevant timescale have not occurred.
Although these phenomena are sometimes reported in the literature, apart from hydrolysis which has been thoroughly studied at several temperatures, the other ones have not been deeply analyzed and their timescales have not been so far determined.
Because substitution rates based on longer timescales have not been estimated in S. aureus, it is impossible to know the extent to how mutation rates and substitution rates differ.
Yesterday the RSA president, Penny Egan, worried that the GLA has not understood the timescale, said: "The next piece should be under way already, in my view".
Facebook has not given a timescale on its plans to merge the three networks, but has confirmed it is "considering ways to make it easier to reach friends and family across networks".
The FA, which has preferred not to comment on the identity of specific candidates, has not set a timescale for the search for a manager and is likely to appoint an interim to oversee fixtures in September, which include the first World Cup qualifier in Slovakia.
The same applies to the iPlayer and Sky Anytime; and as Kontiki has not announced any timescale for an Apple-compatible version of its software, if you're a Mac user, you aren't going to be able to use the online catch-up services any time soon.
Like Jones, Hogg has undergone a scan for his injury, but the governing body has not given a timescale for the 26-year-old's recovery.
As it stands, there is no information on how or why the data loss occurred and Microsoft has not provided any timescale as to when the 1809 rollout will resume.
The injury could also rule Cole out of Leicester's Heineken Cup quarter-final against Clermont Auvergne on 5 April although Tigers director of rugby Richard Cockerill has not put a timescale on his return.
