A library of materials is screened for mechanical properties such as strength, tack, frictional resistance or other properties. Also provided is a method of purifying nucleic acid by applying a nucleic acid sample to a substrate having an anionic detergent affixed to a matrix, the substrate physically capturing the nucleic acid, bonding the nucleic acid to a substrate and generating a signal when the nucleic acid bonds to the substrate indicating the presence of the nucleic acid. The rotation adjustment mechanism is attached on such part of the bracket, whereas on the other hand, the hinge element is disposed in one of two symmetrical lateral sides of the rotary body relative to the afore-said central vertical line. Two groups of sub-fields with similar sizes, for displaying the individual portions and one group of sub-fields, called extra-codes, for displaying the common portion.