Physical dormancy means the seed (or fruit) coat is water impermeable.
However, other studies have shown that soil microbes have no effect on rendering impermeable seeds permeable.
Outcomes of children receiving the intervention prove that this pathway can be altered and is not impermeable.
In this paper the problem on the impermeable parachute of optimum shape in a subsonic gas flow is solved.
A possibly longer storage period in the second year might have resulted in dormancy loss and in a corresponding decrease in percentages of impermeable seeds.
The five species presenting impermeable seed coats do not manifest identical behaviour.
There was a general positive correlation between proportion of fresh seeds with impermeable coats and thickness of the water-impermeable and mechanical layers.
Crudely speaking, the channel itself may be viewed as a pipe (cylinder) embedded in an impermeable membrane.
