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Publishers Clearing House. Publishers Clearing House (PCH) is a direct marketing company that markets merchandise and magazine subscriptions with sweepstakes, and prize-based games. Publishers Clearing House was founded in 1953 by Harold Mertz to replace door-to-door magazine subscription sales by a single vendor offering multiple subscriptions by mail.
The polymerase chain reaction, or PCR, is a technique used to amplify DNA through thermocycling â cyles of temperature changes at fixed time intervals.Using a thermostable DNA polymerase, PCR can create numerous copies of DNA from DNA building blocks called dinucleoside triphosphates or dNTPs.n addition to the primers and DNA template, DNA polymerase is essential for the PCR reaction. The enzyme most commonly used in PCR is Taq polymerase, which is a thermostable enzyme isolated from the bacterium Thermus aquaticus that makes its home in hot springs.