Thanks for the post.
"determination of biomolecules in solution" The main focus was in bio-molecules. So molecules and solution goes with chemistry. the secondary focus was developing a Cry-electronic microscope and that part is physical , may go with Electronics / physics.
Thanks! Personally I think it is more appropriate to put it in the category of chemistry than physiology or medicine.
But it is somehow boarder line to put it in physics or chemistry.
It is so true that study of bio-molecules in solution is really important and challenging, especially for those proteins could not be easily grown in to crystal!