Currently, graphene is considered as the structural base of all the allotropic forms of carbon found since 1985 (Figure 1) and was synthesized in 2004 by Geim and Novoselov et al.
Integrin, an allotropic cell adhesion molecule, mediates the interaction between a cell and extracellular matrix (ECM), thereby facilitating tumor metastasis.
On thermo-chemical treatment it is necessary that the steel, in contact with a substance able of supplying Carbon, is heated up at temperature higher than the critical zone (880 to 980[degrees]C), for the iron to be turned into gamma allotropic form.
It exists at range of temperature extended between room temperature and 1500[degrees]C and presents five allotropic forms: [alpha], [[alpha]'.sub.H], [[alpha]'.sub.L], [beta] and [gamma] [9, 10] however their stability ranges on heating and cooling are different [11].
As Veronique Pauly writes, "Gender distinctions thus collapse and differences seem to coalesce, as if men and women were allotropic states of the same essence.
The chemical-thermal treatment of nonferrous metals and alloys, which undergo allotropic or phase transformations during heating and characterized by a wide temperature interval of existence of high-temperature modification, is one of the most common methods to improve the durability of structures' components.
The pale yellow nonmetallic element occurs widely in nature in several free and combined allotropic forms and is used in black gunpowder, rubber vulcanization, the manufacture of insecticides and pharmaceuticals, and in the preparation of sulpher compounds such as hydrogen sulfide and sulpheric acid.
There is another ego, according to whose action the individual is unrecognizable, and passes through, as it were, allotropic states which it needs a deeper sense than any we've been used to exercise, to discover are states of the same single radically-unchanged element.