Our finding that hopanoid methylation enhances membrane rigidity supports the interpretation that past intervals of heightened 2Me-hopane abundance record a history of stress.
The importance of these dynamics is illustrated by modeling long-lived latent reservoirs of virus, through which past intervals of drug resistance can lead to failure of suppressive drug regimens.
As Halley observed, if the comet that now bears his name had appeared at regular intervals in the past, these intervals were not precisely 75 years long, but varied from roughly 73 to 77 years.
It's only when we get past the interval that Pelly seemingly recognises the virtues of theatrical stillness, as Stéphanie d'Oustrac's Béatrice grapples with her feelings for Bénédict in sudden isolation, before their final spat takes place on a nearly bare stage.
For the just past time interval, the aggregations should be computed across the hierarchy of the spatial structure from top to bottom.
The paper deals with an approximate method for solving a mixed boundary value problem for nonlinear difference equations containing a maximum of the unknown function over a past time interval.
Because of the presence of the maximum of the unknown function over a past time interval, there is no explicit formula for the exact solutions of (28) and (29).
Differential equations with 'maxima' are adequate models of real world problems, in which the present state depends significantly on its maximum value on a past time interval (see [1 4], monograph [5]).
The vector ({mathbf {x}}) thus obtained describes the pattern of traffic flow variation over one past time interval of duration T in a neighbourhood of size n of arc a.
The presence of the maximum function over a discrete past time interval in the discrete equation requires not only more complicated calculations but also a development of new methods for qualitative investigations of the behavior of their solutions as well as approximate methods for their solving.
This proportion appears to be lower than in farmer studies (Dosemeci et al. 2002; Zahm et al. 1993) but may be because most of the farm work was in the distant past (median interval between last farm work and interview was 37 years, and median duration of farm work was only 8 years).
