nitrogen 15

Under the same fertilizer level , CR-urea could reduce nitrogen 15 % - 25 % loss availably , comparing with NH_4HCO_3 and usual urea .

在相同施肥量的实验条件下，与碳酸氢铵和普通尿素相比，控释尿素可有效地降低氮素流失15%~25%；

Methods : Cartilages taken aseptically from aborted fetus were frozen to - 80 ℃ and preserved in - 196 ℃ liquid nitrogen with 15 % dimethylsulfoxside ( DMSO ) as cryoprotective agent .

方法：在无菌条件下，切取引产胎儿的四肢及胸肋软骨。以15%二甲基亚砜为低温保护剂，进行超低温冷冻（－80℃），保存于－196℃的液氮中。

Taken from fetus of non-plan-birth in aseptic condition , limb and costal cartilages were used in 38 clinical cases after being frozen at - 80 ℃ and preserved in - 196 ℃ liquid nitrogen with 15 % dimethylsulfoxside ( DMSO ) as cryoprotective agent .

在无菌条件下切取计划外生育引产胎儿的四肢及胸肋部软骨，应用于临床38例。将切取的软骨经15%的二甲基亚砜（DMSO）为低温保护剂。

Study on formation and accumulation of soil nitrate influenced by fertilizer nitrogen with ￣( 15 ) N tracing technique

~（15）N示踪研究氮肥中N对土壤硝酸盐形成和积累的影响

Studies on the digestion and utilization of urea - nitrogen ~ ( 15 ) n in goats

山羊对~（15）N-尿素消化利用的研究

The deep denitrogenation experiments of 125 heats were carried out to reduce the nitrogen content below 15 × 10 ~ ( - 6 ) during decarbonization process .

为了同时把有害元素w（N）降至15×10-6以下，进行了125炉次的深脱氮工艺试验。

The highest tensile strength of joints is 233.5 MPa when the nitrogen volume is approximately 15 % .

当N2体积分数约占15%时，拉伸强度达到最大值233.5MPa。

Study of utilization and effection of Azolla nitrogen with ~ ( 15 ) n isotope labelled method in the rice-azolla-fish cropping system

~（15）N示踪法研究稻萍鱼体系中红萍氮素的利用及对水稻生长的影响

Results indicated that plant Ndff % ( percentage of nitrogen content from nitrogen in fertilizer ), 15 N uptake , 15 N use efficiency and 15 N remained in soil were significantly affected by timing of 15 N application treatments and 15 N rates .

结果表明植株氮素含量中来自肥料氮的百分比（Ndff%）、水稻对15N的吸收和利用率以及15N的土壤残留率因标记肥料的施用时期和用量的不同而有很大差异。

Each subject inhaled 10 5 % oxygen nitrogen mixture provided by DY 84 oxygen nitrogen mixer for 15 min to simulate the hypoxia tolerance test at 5000m altitude .

采用DY84型混氧仪，使受试者吸入105%低氧混合气持续15min，模拟高空5000m缺氧耐力检查。

N utilization efficiency was tiptop when amount of nitrogen was 20 kg / mu on sand soil but that was tiptop when amount of nitrogen was 15 kg / mu on clay soil .

砂土在施氮量20kg/亩时氮肥当季利用率最高，粘土为施氮量15kg/亩时最高。

The relationship between nitrogen applying amount and grain yield could be expressed in a quadratic curve . When the nitrogen applying amount were 15 kg / 666.7 m2 , the grain yield was the highest .

施氮量与产量均呈二次曲线关系，施氮量为15kg／666.7m~2，产量最高。

The result indicated that the different nitrogen element has the different influence on apocynum venetum degumming , the remnant pectin rate is 14.1 % with ammonium salt as nitrogen additive , 15 % with the nitrate .

结果表明，不同化合价的氮元素对罗布麻生物脱胶具有不同的影响，以铵盐作为含氮添加剂残胶率为14.1%，以硝酸盐作为含氮添加剂残胶率为15%。