1. 
   Hyperchromicity
   Hyperchromicity is the increase of absorbance (optical density) of a material. The most famous example is the hyperchromicity of DNA that occurs when the DNA duplex is denatured. The UV absorption is increased when the two single DNA strands are being separated, either by heat or by addition of den...
   Found op http://en.wikipedia.org/wiki/Hyperchromicity
   
   
2. 
   hyperchromicity
   <chemistry> An increase in the optical density of a solution with nucleic acids in it such that it is able to absorb more ultraviolet radiation, which occurs when the double-stranded nucleic acid molecules denature into single-stranded molecules. ... (11 Jan 1998) ...
   Found op http://www.mondofacto.com/facts/dictionary?hyperchromicity
   
   

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