Keywords: LeatherResearch 018.jpg In the NBS-developed method each component appears as a sepaate colored patch on a sheet of cellulose paper The amount of each amino acid present is determined by comparing optical densities of the extracted patches with appropriate calibration curves National Institute of Standards and Technology 1956-01-01 National Institute of Standards and Technology PD-USGov-NIST PD-USGov National Bureau of Standards National Institute of Standards and Technology Leather Leather shoes |