Description. Ammonium sulfate precipitation is one of the most commonly used methods for protein purification from a solution. In solution, proteins form hydrogen bonds with water molecules through their exposed polar and ionic groups.When high concentrations of small, highly charged ions such as ammonium sulfate are added, these groups compete with the proteins to bind to the water molecules.This removes the water molecules from the protein and decreases its solubility, resulting in precipitation.n solution, proteins form hydrogen bonds with water molecules through their exposed polar and ionic groups. When high concentrations of small, highly charged ions such as ammonium sulfate are added, these groups compete with the proteins to bind to the water molecules.
In the UK, a PhD stands for âDoctor of Philosophyâ, sometimes referred to as a âdoctorateâ. It is the highest level of degree that a student can achieve. At some institutions, including Oxford University, a Doctor of Philosophy is known as a DPhil.
People don't get honorary degrees because they photograph well or are neat people. They get the degree because they have furthered the science, performed fundamental research, introduced innovative or radical new lines of thought that have produced significant results, etc. In that respect, a PhD is a PhD is a PhD. Most PhDs earn their degree the traditional way, then go on to do nothing innovate with their lives. When someone takes the opposite route, then the university (or many universities) confer an honorary PhD that is equal to a traditional PhD in every single aspect.