These include the Convention on Biological Diversity (CBD, implemented into European legislation by Council Decision 93/626/EEC), which requires ratifying nations to work to prevent the introduction, spread, and export of all types of invasive species (http://www.cbd.int/).int/
Periodization, they write, should not be based on chronological boundaries, but a "time section dominated by a system of literary norms, standards, and conventions, whose introduction, spread, diversification, integration, and disappearance can be traced" which must be extracted from history, with boundaries marked by both internal and external changes.
Introduction Spreading depolarisations (SD) occur spontaneously in ischaemic cortex and are implicated in the evolution of the ischaemic penumbra.
Furthermore, other risk factors identified possible vehicles for introduction, spreading and/or persistence within farms, such as import of straw from abroad, access to the goat stable of cats, dogs and use of artificial insemination, and covering airspaces of the stable.
Our advisers directed us back to women's writing of the past, suggested writers, wrote introductions, spread the word and for each of us, in different ways, became a community of friends retained today.
The invasion itself took place during several waves of introductions spread out over 500,000 years, likely due to shifts in oceanographic conditions (Patzkowsky and Holland 1996).
Terry Stokes, chief executive of the group, referred to a "triple firewall" to prevent the introduction or spread of the disease.
But this natural tendency was hastened by the introduction and spread of minuscule as the normal way of writing, after which the purpose of uncial changed completely.
The study confirmed that the prime defense against the introduction and spread of the disease, bovine spongiform encephalopathy, or B.S.E., was a ban on meat and bone meal used to feed cattle.
