Abstract: There are disclosed a DNA-immobilized microsphere comprising DNA chains having base sequences which bind a specific protein specifically, and a carrier having a particle size of not more than 50 .mu.m and not less than 0.01 .mu.m which does not adsorb any protein, said carrier and said DNA chains being bound to each other by a chemical bond, and a process for purifying a protein using said microsphere.

Abstract: A process for producing a light-transmitting element of a synthetic resin, which comprises(1) preparing a mixture composed of at least three monomers, said monomers having a difference in the ease of polymerization under given polymerization conditions, and that monomer in the monomeric mixture which is easiest to polymerize being capable of giving a polymer having a lower refractive index than a polymer from any of the other monomers in the monomeric mixture,(2) maintaining the monomeric mixture in a predetermined shape, and(3) thereafter applying to the monomeric mixture maintained in the predetermined shape such polymerization conditions that polymerization begins at the outside portion of the predetermined shape of the monomeric mixture and proceeds gradually toward its inside portion, thereby to form a polymeric article in which the proportion of polymer units derived from the monomer which is easiest to polymerize is largest at said outside portion and gradually decreases toward its inside portion and t

Abstract: A method of manufacturing a light conducting element of synthetic resin in which a continuous change takes place in refractive index from the surface of the element toward its interior, which comprises bringing a transparent solid article of a network polymer which is in the incompletely polymerized state and contains 2 to 80% of a solvent-soluble component, into contact at its surface with a monomer capable of forming a polymer having a different refractive index from the network polymer thereby to cause the diffusion and migration of the monomer into the interior of the article through the contact surface, thereby setting up a gradient in the concentration of the monomer component in the interior of the above article which gradually decreases from the contact surface toward the interior, and simultaneously with, or after, this diffusion step, polymerizing the monomer in the interior of the article and completing the polymerization of the network polymer of the article.