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The 1997 Les Houches workshop on "Dynamical Network in Physics and
Biology" was the third in a series of meetings "At the Frontier
between Physics and Biology." Our objective with these workshops is
to create a truly interdisciplinary forum for researchers working
on outstanding problems in biology, but using different approaches
(physical, chemical or biological). Generally speaking, the
biologists are trained in the particular and motivated by the
specifics, while, in contrast, the physicists deal with generic and
"universal" models. All agree about the necessity of developing
"robust" models. The specific aim of the workshop was to bridge the
gap between physics and biology in the particular field of
interconnected dynamical networks. The proper functioning of a
living organism of any complexity requires the coordinated activity
of a great number of "units." Units, or, in physical terms, degrees
of freedom that couple to one another, typically form networks. The
physical or biological properties of interconnected networks may
drastically differ from those of the individual units: the whole is
not simply an assembly of its parts, as can be demonstrated by the
following examples. Above a certain (critical) concentration the
metallic islands, randomly distributed in an insulating matrix,
form an interconnected network. At this point the macroscopic
conductivity of the system becomes finite and the amorphous metal
is capable of carrying current. The value of the macroscopic
conductivity typically is very different from the conductivity of
the individual metallic islands.
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