天然丰度

天然丰度的N-磷酰化氨基酸的~（15）NNMR研究

Natural Abundance N-Phosphoryl Amino Acids Studied by ~ ( 15 ) N NMR Spectroscopy

采用二级分离，可将天然丰度1.1%的~（13）C浓集至95%以上，而生产成本估计不到常规法的30%。

When using a two stage separation process , C-13 with a natural abundance of 1.1 % can be enriched to more than 95 % , yet the production cost is estimated to be less than 30 % of conventional processes .

~（15）N天然丰度法测量豆科牧草共生固氮的评估

Evaluation of natural ~ ( 15 ) n abundance method in estimating symbiotic dinitrogen fixation by leguminous grasses

用~（15）N天然丰度法估测结瘤作物的共生固N2量

Estimation of symbiotic dinitrogen fixation by modulating plants using variation in natural ~ ( 15 ) n abundance

利用~（15）N天然丰度法评估森林生态系统植物的固氮能力

Evaluating the potential of nitrogen fixing of plants in the forest ecosystem by using natural ~ ( 15 ) n abundance method

利用森林生态系统中植物茎叶与土壤氮的氮同位素组成（~（15）N天然丰度值）的变化评估植物固氮能力，为野生固氮植物资源调查提供一种简便易行的测试方法。

The potential of nitrogen fixing of plants was evaluated by using the variation of nitrogen isotope component in leaves and stems of plants and in soil .

三氯化硼中硼同位素天然丰度比的红外光谱测定

Determination of natural fractional isotope abundance ratio of boron in boron trichloride by infrared spectroscopy

本文简介了使用FinniganMAT262热电离质谱仪对超微量钐天然同位素丰度比的精密测定。

The measurement method of the isotopic abundance ratios for the nanogram samarium was performed by Finnigan MAT 262-RPQ thermal ionization mass sepctrometer .

等离子体质谱法（ICP/MS）测量天然锇同位素丰度

Determination of Abundance of Natural Osmium by ICP / MS