Abstract: Pentadentate chelators (PDC) resins are the metal chelate resins capable of forming the octahedral complexes with several polyvalent metal ions including Cu2+, Ni2+, Zn2+ and Co2+ with five coordination sites occupied by the chelator. This results in the best stability of the complexes and in one coordination site free for interaction and selective binding of accessible cysteine/histidine residues and chiefly histidine containing biomolecules such as proteins or peptides etc. Cu-PDC can be used as concentration resins to reduce the volume of a protein solution. It can be used also as a universal support for immobilizing covalently all proteins, using a soluble carbodiimide.

Abstract: An apparatus for tracking the movement of a number of products. The apparatus includes a shelf with the products positioned thereon. The shelf has a fit end with an optical sensor positioned thereabout. The optical sensor tracks the movement of the products. A guard is positioned about the first end of the shelf adjacent to the optical sensor so as to prevent exterior light from interfering with the optical sensor.