Abstract: Compositions for tissue engineering and drug delivery have been developed based on solutions of two or more polymers which form semi-interpenetrating or interpenetrating polymer networks upon exposure to active species following injection at a site in a patient in need thereof. The polymers crosslink to themselves but not to each other; semi-interpenetrating networks are formed when only one of the polymers crosslink. The resulting viscous solutions retain the biologically active molecules or cells at the site of injection until release or tissue formation, respectfully, occurs. As a result of studies conducted with polymer-cell suspensions forming interpenetrating polymer networks, it has been determined that polymer solutions can be formulated wherein the active species is provided by exposure of the polymer solution to an exogenous source of active species, typically electromagnetic radiation, preferably light.

Abstract: A method for temporarily adhering an image to a surface is shown utilizing liquid soluble substrates that have printed images of liquid insoluble ink. The liquid soluble substrate is positioned on a surface, such as a billboard, sidewalk, parking lot, telephone pole, skin, clothing, etc., and a liquid, typically water, is applied to the liquid soluble substrate and/or to the surface in such a quantity, and at such a temperature, and at such a pressure and velocity so as to be absorbed by the liquid soluble substrate in a sponge-like fashion. As the substrate dries, it takes on the shape of the surface, conforming and adhering to the surface through a mechanical interlock therewith. Various coatings may be applied to extend the longevity of the substrate. The liquid soluble substrate may be removed from the surface by applying a sufficient quantity of liquid at a sufficient temperature, pressure and velocity.

Abstract: Compositions for tissue engineering and drug delivery have been developed based on solutions of two or more polymers which form semi-interpenetrating or interpenetrating polymer networks upon exposure to active species following injection at a site in a patient in need thereof. The polymers crosslink to themselves but not to each other; semi-interpenetrating networks are formed when only one of the polymers crosslink. The resulting viscous solutions retain the biologically active molecules or cells at the site of injection until release or tissue formation, respectfully, occurs. As a result of studies conducted with polymer-cell suspensions forming interpenetrating polymer networks, it has been determined that polymer solutions can be formulated wherein the active species is provided by exposure of the polymer solution to an exogenous souce of active species, typically electromagnetic radiation, preferably light.