在电子显微镜下观察到的构成核仁的三种基本结构组分之一，由直径为15-20nm的核糖核蛋白颗粒构成，这些颗粒是正在加工、成熟的核糖体亚单位前体颗粒，是核糖体亚单位成熟和储存的位点。
...中心的电子密度最高的部分是致密纤维组分(dense fibrillar component)，是活跃进行rRNA合成的区域；颗粒组分(granular component)是由电子密度较高的核糖核蛋白组成的颗粒，这些颗粒代表着不同成熟阶段核糖体亚单位的前体。
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近年来，“碎屑模型”和“颗粒指数”概念的提出使得砂岩碎屑组分的研究进入了宏观地质学的实用领域。
The concept of "Fragment Modem" and "Grain Index" recently put forward made the study of sandstone fragment components into practical field of macro- geology.
对不同结构组分的颗粒、胶结、交代、 结晶和裂缝进行讨论。
The particles, cementation, age, crystallization, split of the different structure constituents of these kinds of limestone were discussed.
考察了固相组分颗粒尺寸、液固比（L/P）和固化液组成等对骨水泥抗压强度的影响。
The effects of preparing conditions, such as particle size of the solid component, liquid-to-powder ratio (L/P) and liquid composition, on compressive strength of calcium phosphate were investigated.
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