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project.baumberg
Diffusion ist der Vorgang, daß sich mikro-
skopische Partikel (oder auch Moleküle) in
Flüssigkeiten oder Gasen frei oder durch
semipermeable (halbdurchlässige)
Barrieren hindurch
ausbreiten.
Diffusion is the spontaneous spreading of something
such as particles, heat, or momentum. The
phenomenon is readily observed when a drop
of colored water is added to clear water, or
when smoke from a chimney dissipates into
the air. In these cases, diffusion is the
result of turbulent fluid motion rather
than chemical reactions or the application
of external force. In cell biology,
diffusion is described as a form
of »passive transport«, by
which substances cross
membranes.
the images are showing
Noctiluca bacteria
south of Japan.