查询词典 isotope

With the development of laser, fast-ion-beam laserspectroscopy has made it possible to measure the isotope shifts in thepreviously unmeasured areas with higher accuracy.

激光器技术的不断发展，快离子束激光光谱学的研究范围进一步扩大以及测量精度越来越高。

To establish a new method to isolate genomic regulatory sequence using unpurified nuclear extract, here a new strategy was developed based on modified whole genome PCR and electrophoresis mobility shift assay. The principle is as follows. After sonication and ligation with DNA linker, human genomic DNA is amplified and labeled with isotope by whole genome PCR.

为了建立一种利用未经纯化的细胞核粗提物就能从人基因组中快速、大量筛选DNA调节片段的新方法，本研究对原有的全基因组PCR技术进行改进，结合凝胶阻滞实验，建立了筛选DNA调节片段的新方法。

The distribution of uranium isotope composition is not only can be used to predict the location of uranium ore body, but also can be used to study the rolling of the roll during the process of the ore body formation.

该砂岩型铀矿床的铀同位素组成分区特征不仅是预测铀矿化定位的依据，而且也充分说明了铀富集成矿过程的滚动性。

Their Volcanology, Geochemsitry and Petrology shore based analytical and experimental laboratories include the following equipment for geochemical analysis: thermal ionization mass spectrometers, radioactive isotope tracer and dating facilities, an electron microprobe and an X-ray fluorescence spectrometer.

他们的实验研究设备有：热电离大型分光计、放射性同位素跟踪仪、地质年龄测定器、电子微探针、x射线荧光分光计。

According to metamophic core complexes, syn-tectonic intrusive rock and its isotope dating data, divide Songliao basin evolution history into three stages: 1 orogenic period land-land collision; 2 post orogenic period mantle delamination, metamophic core complexes uplift and collapse extension; 3 weak extend stable depression in continent.

根据变质核杂岩、同构造侵入岩以及同位素年龄资料，将松辽盆地构造演化历史划分三个阶段：(1)造山期的陆—陆碰撞；2造山期后的地幔拆沉，变质核杂岩上拱和塌陷伸展断陷；(3)弱伸展稳定大陆内坳陷。

Stable carbon and nitrogen isotope ; weever ; metabolism

碳氮稳定同位素；鲈鱼；新陈代谢

The naturally occurring stable carbon and nitrogen isotopes were used as tracers to study the influence of different ecological factors on the two isotopic compositions in different weever tissues under the control conditions in the metabolic process, and the stable isotope fractionation in weever tissues in metabolic process was used to study the flow pathway of nutrient and energy for food web in the ecological system.

利用天然存在的碳氮稳定同位素作为示踪剂，研究了在受控条件下驯养的鲈鱼的新陈代谢过程中不同生态因子(水温、摄食水平、体重等)对鲈鱼体内不同组织的碳氮稳定同位素组成的影响。通过鲈鱼新陈代谢过程中的稳定同位素分馏作用，研究了在生态系统食物网中的物质与能量转换规律。

The pot experiment results showed that inoculation with A1501 and A1513 could promote the growth and grain yield of rice. Comparison with the non\|inoculation, the grain yeild of rice treated with A1501 and A1513 increased by 8 5% and 10 3% respectively. And %Ndfa of rice shoot and grain estimated by 15 N\|isotope dilution method was 9 00% and 11 5%, respectively, which was consistent with the increment of the total N(8 5% and 11 6%,respectively).

盆栽结果表明，接种A.faecalis 显著提高了水稻的生长，接种A1501 和A1513 的水稻稻谷产量分别比未接种提高了85％和103％，用15N 同位素稀释法估测水稻地上部总氮中来源联合固氮的百分率达900％和115％，其结果与水稻地上部总氮量的增加幅度（86％和116％）基本一致。

The results show that the angular distribution of the total differential cross section at zero degree increases and the position of oscillation minimum of the same order gradually shift towards small scattering angle along with the increase of the incident isotope He atom mass at identical collision energy. And crossing angle between the elastic and total inelastic DCS gradually decreases and the total inelastic DCS gradually increases.

结果表明：在相同碰撞能量时，随着同位素氦原子质量的增加，总微分截面在0°时的角分布逐渐增大，同一级衍射振荡极小值位置逐渐向小散射角方向移动；弹性与总非弹性截面交界角逐渐减小，总非弹性截面逐渐增加。

Some problems of determining uranium isotope abundance by MAT-260 mass tpectrometer, especially, the influence factors on precision and accuracy are di-acussed. NBS standard samples are used for calibrating the acquisited data.

本报告介绍用MAT-260型质谱计测定铀同位素丰度，着重探讨了影响数据精确度的因素，并采用美国国家标准局样品对测得的数据进行校正，以保证其较高的准确度。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。