All 29987 particles (grep and orange ones) own exactly the same physical properties
except for the interaction with the membrane.
The 4969 orange particles are initially close to the tree root; they are created all along the
simulation in order to compensate for the ones that are lost due to the permeability
of the membrane.
The partial pressure of Nitrogen (80%) and of Oxygen (20%) is maintained.
Here are some close-ups of this diffusion process:
The same model used in a bidimensional space gives a better understanding of the process:
(CMAP28 WWW site: this page was created on 03/21/2002 and last updated on 04/02/2019 07:53:08 -CEST-)