Polymerase chain reaction (PCR) is a laboratory technique used to amplify DNA sequences. The method involves using short DNA sequences called primers to select the portion of the genome to be amplified.olymerase chain reaction (PCR) is a laboratory technique used to amplify DNA sequences. The method involves using short DNA sequences called primers to select the portion of the genome to be amplified.
The smallest possible size for anything in the universe is the Planck Length, which is 1.6 x10-35 m across.
the great circle or orthodromic distance is the shortest distance between two points on the surface of a sphere measured along the surface of the sphere as opposed to a straight line through the sphere s interiorhrough any two points on a sphere which are not directly opposite each other there is a unique great circle the two points separate the great circle into two arcs the length of the shorter arc is the great circle distance between the points a great circle endowed with such a distance is the riemannian circle