On the influence of low-energy ionizing radiation on the amino acid molecule: proline Jelena Tamuliene, Liudmila Romanova, Vasyl Vukstich, Alexander Papp, Serhiy Shkurin, Laura Baliulyte and Alexander Snegursky Eur. Phys. J. D, 70 6 (2016) 143 Published online: 23 June 2016 DOI: 10.1140/epjd/e2016-70171-0