Creative Enzymes has been the expert of enzyme activity assays for years. Using the resources of most advanced spectrophotometers and a strong team of enzymologists, we have developed specific measurement methods for the oxidoreductase enzymes that act on nitrogen and sulfur atoms. These enzymes are designated as EC 1.4, EC 1.5, EC 1.6, EC 1.7, and EC 1.8, and comprise of hundreds of enzyme members. No other company has the similar capability of enzyme activity tests. https://www.creative-enzymes.com/service/enzyme-activity-measurement-for-oxidoreductases-acting-on-nitrogen-and-sulfur-using-spectrophotometric-assays_63.html