嘌呤碱基

One of the purines or pyrimidines that occurs attached to the sugar component of DNA or RNA.

碱基嘌呤或嘧啶（胸嘧啶、胸腺嘧啶和尿嘧啶）的一种，附着在脱氧核糖核酸或核糖核酸的糖分子上

Starting from intermediates of L-ribose, we synthesized a series of L-ribosides and their derivatives with the bases of pyrimidines and purines.

同时，我们从合成L—核糖的中间体出发合成了一系列碱基为嘧啶类和嘌呤类的L—核苷及L—核苷衍生物。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。