在DNA和RNA中,特别是tRNA中还有一些含量甚少地碱基,称为稀有碱基(rare bases)稀有碱基种类很多,大大多情况是甲基化碱基。tRNA中含稀有碱基高达10%。
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... rare species 稀有种 ; 稀有品种 ; 稀有物种 ; 偶见种 rare base 稀有碱基 ; 稀有盐基 Rare commodity 奇货可居 ...
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rare-earth base 稀土基
Rare earth base alloy 稀土基合金
rare earth lead base alloys 稀土铅基合金
y base heavy rare earth 钇基重稀土
rare earth-Schiff base complex 稀土席夫碱配合物
rare earth Schiff base complex 稀土Schiff碱配合物
yttrium base heavy rare earth 钇基重稀土
Rare earth base alloy with special characteristic make them potential candidates for function materials.
稀土基合金的特性能满足人们在特殊材料上的实际需求。
The distribution and fractionation of Rare Earth element are the base for their usage as trace elements.
稀土元素在环境中的分布分异机制,是研究其作为地球化学示踪剂的重要基础和必要前提。
Examples of this class include many of the rare or precious metals, strip or extruded shapes in base metals or alloys, some bearing metals, some hard or soft magnetic materials, etc.
这类产品包括许多稀有金属或贵金属,贱金属或合金带材或各种形状的挤压型材,某些轴承金属,某些硬软磁性材料等。
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