A radioactive isotope of strontium ( with the mass number 90) that is present in the fallout from nuclear explosions; can be assimilated like calcium into bones. 锶的放射性同位素(原子质量数为),存在于核爆炸的原子尘中,能象钙一样被吸收到骨中。
Isotope: One of two or more species of atoms of a chemical element having nuclei with the same number of protons But different numbers of neutrons. 同位素:一种化学元素的两个或多个类型,它们的原子核具有相同的质子数,而中子数却不同。
A radioactive isotope of cobalt with mass number 60; a source of exceptionally intense gamma rays; used in radiation therapy. 具有放射性的钴的同位素,原子质量数为,一种能量极高的伽马放射源,用于放射疗法。
The stable isotope labeling and the isotope coded affinity tags ( ICAT) strategy provided an ideal method for accurately quantitating the low copy number proteins which play a key role in cells or tissues. 从稳定同位素标记到ICAT战略的提出,为准确定量在细胞或组织中发挥重要调节功能的低丰度蛋白质提供了一个较为理想的方法。
The change of carbon-oxygen isotope composition is very big and negative number in lowstand system tracts. 低水位体系域碳、氧同位素组成变化剧烈,且均为负值。
The results reveal that the carbon isotope of gas alkyl hydrocarbon has following characteristics: ① with the increase of carbon number, the δ 13C frequency range of methane and its homologues reduces, and the main frequency value gets heavier; 研究结果表明,烷烃气碳同位素具有以下特征:1甲烷及其同系物随碳分子数的增加,δ13C频率区间值展布缩小,主频率值变重;