1. Characteristics of nitro reduction of the carcinogenic agent, 4-nitroquinolone N-oxide
2. On the mutagenicity of nitrofurans
3. It is to be noted that structures of fragment ions in the schemes have been used to facilitate understanding of the fragmentation, but only limited studies have been done to distinguish possible isomeric structures. The elemental composition of all the ions in the schemes were confirmed to within 2.0 mmu by high resolution measurements. Most, if not all, transitions in the schemes are supported by the observation of metastable peaks.