| The basic structure of a nucleotide contains ribose with a nitrogenous base and a phosphate group. |
| Urea is a nitrogenous compound excreted in the urine by humans and most other mammals. |
| In its tautomeric state, a nitrogenous base cannot pair with its normal partner. |
| The majority of these signals can be assigned to amino acids and to nitrogenous metabolites derived therefrom. |
| Degraded nitrogenous compounds, mainly amino acids, are translocated to other organs, leading to reduction in the leaf nitrogen content. |
| However, marked differences were found in the intensity of labelling of a range of nitrogenous compounds. |
