Abstract: An additive printing apparatus includes a light transmissive substrate, a light source adapted to direct light through the light transmissive substrate, a photopolymerizable material source providing photopolymerizable material, and a fluid path from the photopolymerizable material source to a delivery position proximate the light transmissive substrate. Material is delivered through the fluid path the delivery position to form a liquid bridge of the photopolymerizable material, the liquid bridge having an area of contact with the light transmissive substrate, such that, in a method of additive printing, photopolymerizing light can be shone through the light transmissive substrate to polymerize the photopolymerizable material.

Abstract: An additive printing apparatus includes a light transmissive substrate, a light source adapted to direct light through the light transmissive substrate, a photopolymerizable material source providing photopolymerizable material, and a fluid path from the photopolymerizable material source to a delivery position proximate the light transmissive substrate. Material is delivered through the fluid path the delivery position to form a liquid bridge of the photopolymerizable material, the liquid bridge having an area of contact with the light transmissive substrate, such that, in a method of additive printing, photopolymerizing light can be shone through the light transmissive substrate to polymerize the photopolymerizable material.

Abstract: The present invention generally relates to introducing genetic material to living cells. In some embodiments, the present invention relates to compositions of matter for targeted delivery of nucleic acids to cells. In other embodiments, the present invention relates to methods of targeted delivery of nucleic acids to cells. In still other embodiments, the present invention relates to polymers that contain at least one amino acid in their backbone. In yet other embodiments, the present invention relates to polymers that contain at least one amino acid in their backbone thereby resulting in biodegradability, and in some embodiments, controlled biodegradability.