Tissue regeneration membranes; implantable living tissue; and bone implants comprised of living tissue; carrier media for implants namely, poloxamers, block copolymers, poly(oxyalkylene) block copolymers, poloxamers dispersed in solvent, block copolymers dispersed in solvent, poly(oxyalkylene) block copolymers dispersed in solvent, sold as an integral component of bone regeneration allograft tissue