Introduction: Salam Phase Transition Theory a Salam postulated that chirality among the twenty amino acids, which make up the proteins, may be a consequence of a phase transition which is analogous to that due to bCs superconductivity Salam suggested a unique mechanism whereby the parity violating energy difference(PVED between enantiomers might lead directly to a homochiral product. He surmised that there should exist an abrupt phase transition at a critical temperature T, causing a change in the chirality from d-amino acid to that of more stable natural enantiomer. the L-amino acidIntroduction Introduction ：Salam Phase Transition Salam Phase Transition Theory „ Salam postulated that postulated that chirality chirality among the twenty among the twenty amino acids, which make up the proteins, may be amino acids, which make up the proteins, may be a consequence of a a consequence of a phase transition phase transition which is which is analogous to that due to analogous to that due to BCS superconductivity. superconductivity. Salam suggested a unique mechanism whereby the Salam suggested a unique mechanism whereby the parity violating energy difference ( parity violating energy difference (PVED) between between enantiomers enantiomers might lead directly to a might lead directly to a homochiral homochiral product. He surmised that there should product. He surmised that there should exist an abrupt phase transition at a critical exist an abrupt phase transition at a critical temperature temperature T c, causing a change in the , causing a change in the chirality chirality from D -amino acid to that of more stable amino acid to that of more stable “natural natural ” enantiomer enantiomer, the L , the L -amino acid. amino acid