查询词典 presence

Nucleophilic opening of the terminalepoxide 57 by a lithium acetylide from 27 in the presence of BF3·EtO furnishedcompound 58, which had the skeleton of target molecule, subsequent conversionsinvolved the introduction of γlactone gave Annonacin.

然后以三氟化硼参与的炔负离子开环氧反应建立分子骨架，得到化合物58。随后经氢化，引入α，β不饱和丁内酯环、去保护等几步反应，就得到Annonacin。

Analogous complexes 3a" and 4a"= CpRu(PPh32, Ar = para-C6H4OMe containing methoxy group at the para-position of gem-diphenyl group were similarly obtained from protonation of the corresponding acetylide complexes via formation of vinylidene intermediate. But only complex 3a'= CpRu(PPh32, Ar2 = fluorenyl is stable in solution, and decomposed to unidentified complex when heated to reflux in THF. Deprotonation of complex 4a in the presence of base gives neutral acetylide complex 6a.

在两个相邻位置的苯基对位位置上接有一甲氧基的衍生物3a"和4a"也可利用类似的质子化反应合成，唯有错合物3a'= CpRu(PPh32， Ar2 = fluorenyl 可以稳定於溶液中，不会进行上述反应，如将其溶於四氢呋喃溶液加热至沸腾则会分解产生无法鉴定的化合物。

Test for acid content; test for the presence of an antibody.

对酸含量进行测试；对抗体的存在进行化验

In the presence of these other disorders, the assessment of a gap metabolic acidosis can be cloud ed.

但如果这些其它的紊乱存在的话，代酸间隙的分析就比较困难。

In the presence of these other disorders, the assessment of a gap metabolic acidosis can be clouded.

但如果这些其它的紊乱存在的话，代酸间隙的分析就比较困难。

In the presence of these other disorder s, the assessment of a gap metabolic acidosis can be clouded.

但如果这些其它的紊乱存在的话，代酸间隙的分析就比较困难。

It may mean no more than an acknowledgement of your presence .

它可能仅仅意味着对你出现的认可而已。

Science: Any natural force acting upon matter, any substance the presence of which produces phenomena, whether physical as electricity, chemical as actinism, oxygen, medicinal as chloroform, etc.

指在近代科学中，任何作用于物质的自然力，其出现会产生现象的任何实体，这现象可以是像电那样的物理现象，像光化作用那样的化学现象，……等等

The cell growth and the releasing rate of urease from bacteria and actinomycete in the presence of different nBPT concentrations were examined.

研究了脲酶抑制剂nBPT对土壤中脲酶活性和细菌、放线菌生长及发酵产酶的影响。

Now you may be thinking,"Why do we need an action variable when I could just as well be checking for the presence of person or howmany?"

现在你或许会想"既然我也可以选择person或howmany是否出现，那为什么我们要用一个action变量呢？"

You can snipe the second and third union leaders from this position.

您可以鹬第二和第三工会领袖从这一立场出发。

Aiming at the currently shortage of XML streams quality detecting, this paper proposes a new forecasting method of XML streams quality by least squares support vector machines, which is used the method of XML keys' vector matrix as windows, and vector product wavelet transform to multilevel decompose and refactor the XML streams series, that can fulfill real-time checking demand of XML quality, and ensure constraint, consist- ency and integrality. For even more adapting net load, it proposes a control strategy by weight and adaptive adjustment to ensure XML streams quality.

针对当前XML数据流质量检测存在的不足，提出构建XML键的矢量矩阵作为窗口，利用矢量积小波变换多级分解与重构XML数据流，再结合最小二乘支持向量机对XML数据流质量进行预测的一种方法，满足XML数据流质量重构时实时检测的要求，保证XML数据的约束性、一致性与完整性；为了更好的适应网络负载，采取加权与自适应窗口调整等调度策略充分保证XML数据流的质量检测。