We describe an extension of the adaptive space-time finite element method (ASTFEM) used in the solution of the Lamm equation to the case of multicomponent reacting systems. We use an operator splitting technique to decouple the sedimentation-diffusion process from the reaction process. The former is solved with an ASTFEM approach based on the Petrov-Galerkin method and on adaptive moving grids,...

Carcinoembryonic antigen (CEA) is present in low concentrations in the serum of adults but in greater concentration in patients with different types of carcinoma. We describe a rapid, simple enzyme immunoassay in which a one-step “sandwich” system is used, without treatment of serum. The method has the following characteristics. The anti-CEA and anti-CEA conjugated with peroxidase (the “conjuga...