含氮碱（简称碱基）是核酸中的含氮碱简称碱基，是嘌呤碱（purine）与嘧啶碱（pyrimidine）的衍生物。
一种含氮的分子，嘌呤碱或者是嘧啶碱，它们和戊糖还有磷酸一起构成核苷酸，核苷酸是核酸的基本结构单位。
A nitrogenous molecule, either a PYRIMIDINE or a PURINE, that combines with a pentose sugar and phosphoric acid to form a nucleotide, the fundamental unit of nucleic acids.
生物碱一般是指植物中除蛋白质、肽类、氨基酸及维生素B外的含氮的有机化合物。
The alkaloids refer to some organic compounds which contain nitrogen atom except proteins, peptides, amino acids and vitamin B.
生物碱是广泛存在于自然界天然植物中的碱性含氮有机化合物。
Alkaloids are alkaline nitrogenous organic compounds, which are widely existed in the natural plant.
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