Citation Hunt

Leaderboard

The Wikipedia snippet below is not backed by a reliable source. Can you find one?

Click I got this! to go to Wikipedia and fix the snippet, or Next! to see another one. Good luck!

In page Cell theory:

"

Harvey and Danielli (1939) proposed a lipid bilayer membrane covered on each side with a layer of protein to account for measurements of surface tension. In 1941 Boyle and Conway showed that the membrane of frog muscle was permeable to both K+ and Cl−, but apparently not to Na+, so the idea of electrical charges in the pores was unnecessary since a single critical pore size would explain the permeability to K+, H+, and Cl− as well as the impermeability to Na+, Ca+, and Mg2+. Over the same time period, it was shown (Procter and Wilson, 1916) that gels, which do not have a semipermeable membrane, would swell in dilute solutions.[citation needed]