James Danielli

{{Short description|English biologist}}

{{Use dmy dates|date=April 2022}}

James Frederic Danielli FRS{{Cite journal | last1 = Stein | first1 = W. D. | doi = 10.1098/rsbm.1986.0005 | title = James Frederic Danielli. 13 November 1911 – 22 April 1984 | journal = Biographical Memoirs of Fellows of the Royal Society | volume = 32 | pages = 116 | year = 1986 | jstor = 770110| doi-access = free }} (1911–1984) was an English biologist.

He was famous for research on the structure and the permeability of cell membranes, developing a physical-chemical model in collaboration with the physiologist Hugh Davson. This became known as the Davson-Danielli{{Cite journal | last1 = Danielli | first1 = J. F. | author-link1 = James Danielli| last2 = Davson | first2 = H. | author-link2 = Hugh Davson| doi = 10.1002/jcp.1030050409 | title = A contribution to the theory of permeability of thin films | journal = Journal of Cellular and Comparative Physiology | volume = 5 | issue = 4 | pages = 495 | year = 1935 }} or "protein sandwich" model. He also carried out studies on the chemistry of enzymes and proteins and tried to construct an artificial "cell".