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It is shown here that concurrence between advection and diffusion in a drying sessile drop of a biological fluid can produce spatial redistribution of albumen and salt. The result gives an explanation for the patterns observed in the dried drops of the biological fluids.
We consider site percolation of dimers (" neadles ") on simple cubic lattice. The percolation threshold is estimated as p perc c
We show here that concurrence between convection and diffusion in a desiccated sessile drop of the biological fluid can produce spatial redistribution of albumen and salt. The result gives us an explanation, why the samples of dried drops of biological fluids have the observed structure.