title: Mass spectrometric studies of binding energies for nitrogen bases of nucleic acids in vacuo.
mesh_terms: D001274:Atmospheric Pressure; D006860:Hydrogen Bonding; D013058:Mass Spectrometry; D011687:Purines; D011743:Pyrimidines; D013816:Thermodynamics
chemical_list: D011687:Purines; D011743:Pyrimidines