  A model to describe the arising of new structures in an initial homogeneous
biological system is proposed. The essay is motivated by the intention to work
on a non-equilibrium situation grouping together several mechanisms and
processes as: catalytic reactions on a surface, diffusion, stimulated migration
and selective heterogeneous reaction. A model for morphogenesis in early
embryos is developed on two basic assumptions; (i) the existence of an
electrified surface that defines the shape (form) of the growing structure and
(ii) a mechanism to select morphogens (ions or free radicals) from an initially
homogeneous medium. The homogeneity is broke when an electric potential arise
between different parcels of the system, triggering a complex dynamic that
drive the development of material deposits into localized regions of the space.
The evolution of the deposits is described by a stochastic formalism allowing
for analytical expressions relating macroscopic.
