在室温和中性水溶液中,核酸及其天然碱基的萤光量子产率非常低,使用一般仪器不能测出它们的萤光。因此,进行核酸的萤光分析必须借助各种萤光探针。例如常用的菲啶溴红、原黄素.吖啶橙和光神霉素等有机萤光探针,在核酸分子结构的研究中都提供了许多有用的信息。最近发现稀土元素铽的阳离子 The fluorescence quantum yields of nucleic acids and their natural bases are very low at room temperature and in neutral aqueous solutions, and their fluorescence can not be measured using standard instruments. Therefore, fluorescence analysis of nucleic acids must rely on a variety of fluorescent probes. For example, commonly used phenanthridine bromine red, original flavin, acridine orange and mithramycin and other organic fluorescent probes, in the study of the structure of nucleic acid molecules have provided many useful information. Recently found rare earth elements terbium cation