PPB

Comparison between MOPB04_ 600 and 455,972 sequences from GenBank+ EMBL+ DDBJ+ PPB revealed that the homology were low ( less than 30%). This implied that it was a newly found DNA sequence.

通过与GenBank+EMBL+DDBJ+PDB中的455972个序列进行同源性比较，同源性均小于30%，表明该片段为一新发现的序列。

/ cm3 while that of O3 components is less than 1 ppb at the distance of 50 cm from the panel of the instrument.

在距离该机面板50cm处，负离子浓度大于250万个/cm~3，臭氧浓度小于1ppb；

Sulfinert coating provides stable storage of sulfur and mercury at ppb levels in petroleum samples.

硫钝化的涂层为采样罐提供了稳定的性能,可以储存PPB级的含硫样品.

Previous analytical methods such as conventional ICP MS and INAA usually give low analytical precision of> 15 to 100% for sub ppb to ppt level rock samples.

以往的分析方法（如常规的ICP-MS和中子活化分析方法），对含10-9～10-12级低含量铂族元素的岩石样品分析精度一般较差（>15%～100%）。

As for drilling mud but made up with 35 ppb Bentonite to 100 + vis.

对钻井液,按每桶35磅比例加入膨润土,使粘度达到100秒.

Of these bands, 114 were polymorphic, and the percentage of polymorphic bands ( PPB ) was 95.00 %.

其中,多态性谱带114条,多态性带百分率 ( PPB ) 为95.00%.

The content of aflatoxin Bl in the contaminated fodder was rather high with an amount of 475 ppb.

饲料中黄曲霉素素B1含量相当高，达475ppb。

Studies of the determination of rare earth elements at ppb. level with ICP spectrometry

ppb级稀土元素分量等离子光谱测定的研究

determination of zinc at ppb levels in high-purity gallium with flameless atomic absorption spectrometry

非火焰原子吸收光谱法测定超纯镓中ppb级锌

It'shows that 0.2 ppb of Ag + can be quantitatively absorbed from aqueous solution sample.

水样中0.2ppbAg~+可定量被吸附.

Calibrations showed good linear relationship between photon counts of PMT and concentration of ozone generated by standard ozone calibrator, up to 50 ppb ( parts per billion by volume).

采用标准臭氧发生器标定的结果显示，在0￣50×10-9（体积比）的浓度范围内，化学发光的光子计数值与臭氧浓度之间的线性关系很好。

Global atmospheric N2O concentration has increased from a pre-industrial value of about 270 ppb to 319 ppb in 2005.

大气中N2O浓度已从工业革命前的270ppb左右上升到2005年的319ppb。

DON amounts of various components were in the range of 2900～18670 ppb during milling process.

制粉过程各组分DON含量在2900～18670ppb之间.

Add 25 ppb Bentonite and allow to hydrate for a minimum of 6 hrs.

按每桶钻井液加25磅的膨润土,允许水化至少6个小时.

determination of ppb level anions in sulfolane by ion chromatography with a novel column-switching injection system;

综述了离子色谱技术在气溶胶可溶性无机离子测定中的应用。