查询词典 precursor

In order to obtain the processing parameters of high speed depositing nickel film, experiment was undergone by metallic organic chemical vapor deposition with nickel carbonyl as precursor.

为了获得高速沉积镍膜的工艺参数，以羰基镍 [Ni 4 ]为前驱体，用金属有机物化学气相沉积法进行试验，以SEM ，DSC ，XRD测试分析技术探讨了载气、温度和羰基镍的摩尔分数对沉积速率的影响；也探讨了温度及羰基镍的摩尔分数对镍膜微观形貌的影响。

A precursor of printing technology was the rubbing method of copying inscriptions and carvings on steles.

公元四世纪我国发明拓印技术，是一种把碑刻等上面的文字，图形拓印下来的简单方法。

Aloe plant makes "non-natural" biomineralized structure formed from inorganic precursor species, CaCl_2 in cell walls of leaf spicules by culture techniques.

芦荟植物在其叶刺细胞壁上利用CaCl_2前体分子合成了非自然状态下形成的生物钙化结构。

The effect of the concentrations of precursor and propylene oxide on the gelation time is investigated, and the suitable conditions have been determined for the preparation of coating sols.

通过考察无机盐前驱体和环氧丙烷的浓度对凝胶时间的影响，确定了适宜的工艺条件。

The experiment of potted was carried out in the green house and biao-ben orchard of Shandong Agricultural University from 2002.9~2003.6. Aroma components of fruit were extracted by solvent soluble and analyzed by Gas Chromatogram/ Mass Spectrum , to study on the effect on strawberry aroma component under various nitrogen levels. At the same time , glucose and fructose in fruit were analyzed by High Performance Liquid Chromatography, and the correlation between glucose、 fructose and the precursor of strawberry characteristic aroma component was studied according the former article.

本试验于2002年9月~2003年6月分别在山东农业大学日光温室和果树标本园中进行，采用盆栽的方式，用溶剂萃取法提取香气成分，用气相色谱-质谱联用仪进行定性、定量分析，研究了不同氮素水平对草莓果实芳香成分的影响，同时采用高效液相色谱法测定果实葡萄糖、果糖含量，对果实中葡萄糖、果糖与草莓特征香气成分前体之间的关系进行了初步探讨。

Objective To study the relationship between the vaginal secretions during PPROM and the prognosis of precursor and fetus.

目的 判断未足月胎膜早破的阴道分泌物结果与母儿预后的关系。

In order to elucidate the relationship between the structural features of leginsulin gene in legume plants and their phylogenetic significance,we have cloned the cDNA sequence of leginsulin gene from radicles of broad bean via RT-PCR techniques according to the leginsulin gene sequence we previously obtained from soybean.The cloned cDNA encoded for a precursor protein consisting of the signal peptide,mature leginsulin and an additional 45 amino acids of another polypeptide.

为探明豆科植物中豆类胰岛素基因的结构特征与进化关系，在已获得大豆豆类胰岛素基因的基础上，以蚕豆种子胚根mRNA为材料，采用RT-PCR技术，克隆了蚕豆豆类胰岛素基因的cDNA序列，编码的前体多肽包括信号肽、成熟型豆类胰岛素及另一多肽的45个氨基酸残基。

In this paper, a series of solid base MgO were synthesized via an exotemplating pathway with pine-wood as the template and magnesium acetate as MgO precursor, and were characterized by XRD, SEM, adsorption of n-hexane or nitrogen, Hammett indicator, ICP, JR and TG-DSC techniques.

以松木为模板，乙酸镁为前驱物，通过外模板法制备了一系列的MgO固体碱材料，并用XRD、SEM、正己烷吸附、低温液氮吸附、Hammett指示剂法、ICP、IR和TG-DSC等手段对其进行了表征。

Polyborosilazane, a precursor to SiBNC ceramic, was synthesized via cocondensation approach using methyldichlorosilane (MeHSiCl2), boron trichloride (BCl3) and hexamethydisilazane as starting materials. SiBNC ceramics were obtained by pyrolysing the as-synthesized PBSZ in N2 or NH3/N2 atmospheres.

以甲基氢二氯硅烷、三氯化硼、六甲基二硅氮烷为起始原料，采用共缩合原理合成了聚硼硅氮烷先驱体，将PBSZ分别在N2和NH3/N2气氛中高温热解得到SiBNC陶瓷。

The 57 kD precursor, 37-39 kD acidic subunit and 22-23 kD basic subunit of glutelin and the 13 kD prolamine could be showed clearly.

各种水稻能够显示清晰的蛋白组分条带主要有：谷蛋白37~39 kD酸性亚基、22~23 kD碱性亚基、谷蛋白57 kD前体多肽和13 kD醇溶蛋白多肽。

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％。