Manipulating a single adsorbed DNA for a critical endpoint
  We show the existence of a critical endpoint in the phase diagram of unzipping of an adsorbed double-stranded (ds) polymer like DNA. The competition of base pairing, adsorption and stretching by an external force leads to the critical end point. From exact results, the location of the critical end point is determined and its classical nature established. 
Rajeev Kapri and Somendra M. Bhattacharjee