The Phenylalanine Deaminase (PDA) test can be utilized to identify Gram-negative bacilli that are urea-positive due to the capacity of microorganisms to generate phenyl-pyruvic acids through the process of oxidative deamination. The test is also referred to as the phenyl-pyruvic acids (PPA) test. Phenylalanine is an amino acid that when deaminated through oxidase enzymes, produces … Read more