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This would otherwise not occur as protons have positive charge and hydrophilic properties, making them unable to cross without a channel or transporter.
In the laboratory, a functional interaction between the two domains is promoted by the addition of cations, whose positive charge suffices to overcome the electrostatic repulsion of the negatively charged RNA backbone.
Likewise, in 1929 Chung-Yao Chao, a graduate student at Caltech, noticed some anomalous results that indicated particles behaving like electrons, but with a positive charge, though the results were inconclusive and the phenomenon was not pursued.