Bid rent theory in the central business district (CBD) [edit]. Land users, whether they be retail, office, or residential, all compete for the most accessible land within the CBD. The amount they are willing to pay is called bid rent.
Recombinant or purified protein vaccines consist of protein antigens that have either been produced in a heterologous expression system (e.g., bacteria or yeast) or purified from large amounts of the pathogenic organism.
attenuated virus. Etymology: L, attenuare, to make thin, virus, poison. a strain of virus whose virulence has been lowered by physical or chemical processes, or by repeated passage through the cells of another species.Vaccines made by attenuated strains are used to prevent smallpox, measles, mumps, rubella, polio, yellow fever, and other viruses.A functionally effete virus that is no longer virulent, which may be used to develop a live virus vaccine.ttenuated virus. Etymology: L, attenuare, to make thin, virus, poison. a strain of virus whose virulence has been lowered by physical or chemical processes, or by repeated passage through the cells of another species.