How was Jens C. Skou awarded the Nobel Prize?

Name: Jens C. Skou. 
Country: Denmark.
Date of Birth: 8 October 1918.
Died: 28 May 2018.
The subject of Study: Adenosine triphosphate sodium, potassium, ATPase.
Noble Prize Year: Nobel Prize for Chemistry in 1997 for their research on the discovery of the enzyme called sodium-potassium-activated adenosine triphosphatase, “Na+-K+ ATPase”.