Diffusive Motion in Cells
Most recent answer: 12/09/2018
- Abdullah Chaudhary (age 28)
Montreal, Quebec, Canada
Tough question! There are various ways to track diffusive motions. One is to use fluorescent labels, and watch the fluorescent cloud spread out with time.
For other readers, I should clarify that sub-diffusive means that particles start off diffusing, but their diffusion rates seem to slow down with time. This can happen if partcles rattle around more or less freely in a small region, but have to cross bigger barriers to get farther away, with the typical barrier height growing with distance. Super-diffusive means that the long-time motion is larger than you would expect based on short-time diffusion. Both types are briefly discussed, with references to experiments, here:
Here's a nice biological example, along the lines you're asking about:
(published on 12/09/2018)