A mechanism for providing strong anti-replay protection at a security gateway in a network for protection against an attacker duplicating encrypted packets. N–4,4\u2032-bis diphenylamine sodium salt as an oxidation color former is stabilized by providing it with at least one of a fructosyl amino acid oxidase and a peroxidase in the solution. A plurality of axially extending fins project into the inner chamber. The bifurcated graft is comprised of a main tubular member and two tubular legs, having attachment systems with wall engaging members secured to the superior end of the main tubular member and the inferior ends of the tubular legs. 5 endoamylase units per unit of exoamylase activity. At least one action element associated with the measurement program or at least one step is provided that causes an external, auxiliary program to be executed automatically upon occurrence of a trigger event in the measurement program or in the associated step.