And during these processes, this is when we use the specific activity value, as we'll see in just a moment. So in the next lecture, we're going to focus on the different types of processes that we can use to basically purify our sample. In this lecture, we're going to focus on measuring enzyme activity. When we conduct our protein assay. So to demonstrate how we can measure enzyme activity, let's actually focus on a specific type of enzyme found ourselves known as lactate dehydrogenase. So lactate dehydrogenase is a biological catalyst that basically converts lactate into Pyruvate.