Correlation between polar surface area and bioferroelectricity in DNA and RNA nucleobases See-Chuan Yam, Sharifuddin Md. Zain, Vannajan Sanghiran Lee and Khian-Hooi Chew Eur. Phys. J. E, 41 7 (2018) 86 Published online: 18 July 2018 DOI: 10.1140/epje/i2018-11696-5