We have now confirmed these initial observations in experiments using hemi-brain extracts from these mice that showed accelerated disease after experimental challenge, thus representing a "second passage" of the disease, as is routinely performed to propagate prion strains in experimental models.
This work is a first attempt at bringing first passage times of stochastic systems into wind engineering by suggesting the use of a first passage time map as a standard analysis tool in experimental wind engineering.
Results reveal that dramatic changes occur as early as first passage.
All of them show similar neurological signs as in the second passage, but with a shorter incubation period of 367±38 (n = 5), which is suggestive of strain adaptation (Table S3).
However, LIF alone (either vole or mouse), without embryonic feeder cells, was not sufficient to keep cells undifferentiated, and differentiation was observed as early as the second passage.
These values were normalized to the same fibroblast values as in the second passage.
Endothelial cells were obtained from human umbilical veins and cultured as first and second passage monolayers and then grown to complete confluency on cover slips.
In summary, 3 out of 6 animals inoculated with NBH-annealed fibrils showed infectivity/PrPSc as detected by either second passage or by a single-round PMCA.
With this in mind, one may think of a 'diffusion delay' as the first passage time of a molecule into a predefined subset of the domain or possible chemical state.
The passage number and mean survival times ± standard deviation of the vole groups from which the samples used in the present study derived were as follows: sCJD MM1, second passage, 129±8 dpi; sCJD MV1, second passage, 128±15 dpi; sCJD MM2, second passage, 339±27 dpi; sCJD MM2, third passage, 323±41 dpi; gCJD E200K, second passage, 143±12 dpi; scrapie SS7, third passage, 93±5 dpi.
