In such cases the vascular system is said to be polycyclic in contrast with the ordinary monocyclic condition, These internal strands or cylinders are to be regarded as peculiar types of elaboration of the stele, and probably act as reservoirs for water-storage which can be drawn upon when the water supply from the root is deficient.
Components of cooked meat that have been suggested to cause this include heterocyclic amines, polycyclic aromatic hydrocarbons, nitrogenous residues and iron.
There will be a new Daughter Directive on polycyclic aromatic hydrocarbons.
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Polycyclic Groups Finite soluble groups and infinite polycyclic groups have special generating systems chosen in accordance with a subnormal series with cyclic factors.