The present invention relates to a method of surface treatment of metallic materials, more particularly, to a method of the surface self-nanocrystallization of metallic materials by the bombarding of supersonic fine particles. Security features comprising nanohole arrays are also provided. The lignin-solvent mixture can be separated from the water to form a high energy density fuel that can be used independently or combined with biodiesel. The improved latching mechanism may also include a decoupling member that allows a user to move a selected latch pin receiver assembly to a retracted position by uncoupling a selected latch pin receiver from a camshaft. By using restriction endonucleases having different recognition sites but which produce compatible cleavage products, a library of DNA molecules, of varying length and sequence, may be generated in a desired orientation. When browsing the remote user or users is presented with a searchable history of screen images in reversed order with the most recent history transmitted to the remote user or users first.