查询词典 alkaloids

These selected variables were used in the determination of total volatile alkaloids and total nitrogen in tobaccos by partial least squares method.

偏最小二乘法[3]和主成分回归[4]是NIR技术中常用的两种化学计量学方法，曾被认为对噪音信号不敏感，在对庞大的数据矩阵进行处理时不需要变量筛选，但大量的研究工作表明，有效的变量筛选可以改善模型的预测能力和减少模型的复杂程度[5～8]。

Methods The total alkaloids content was determined by acid dye colorimetry.

采用酸性染料比色法，测定粗叶悬钩子根部总生物碱的含量。

The main results were as following:The content of the total alkaloids in Sophora alopecuroides L is analyzed by the acid dye colorimetry method and the result is 8.21%.

用酸性染料比色法测定对苦豆子样品中总生物碱的含量进行了测定，测定结果为苦豆子样品中总生物碱含量为8.21%。

Part Four: Attempt of the Abnormal Beckmann Rearrangement to the Synthesis of Indole Alkaloids Indole alkaloid is one of the most significant important alkaloid and its synthesis is a continuing interesting work.

Scheme 3 〓四、手性吲哚类生物碱的合成初探手性吲哚类生物碱是一类具有重要生物活性的生物碱，它们的合成研究是有机化学家持续感兴趣的课题。

Benzoyl chloride, phthaloyl dichloride, isophthaloyl dichloride and terephthaloyl dichloride were reacted with cinchona alkaloids to form 16 esters type catalysts 4a-d, 5a-d, 6a-d and 7a-d.

1对于溴乙酰甲酸乙酯为底物的反应，这类以酯键形成的金鸡纳生物碱衍生物表现出的不对称诱导作用不令人满意(22-75%ee)。

With the content of the total alkaloids and mesaconitine as parameters, the optimum condition of absorption and elution were studied in the process of the purification with X-5 macroporous resin.

以川乌总碱和新乌头碱的含量为指标，考察X-5型大孔树脂分离纯化乌头总生物碱和新乌头碱的最佳吸附及洗脱条件。

A method for determination of 14 alkaloids in tobacco has been established.

建立了烟草中14种生物碱的定量分析方法。

Therefore, how to develop a new simple and efficient method to synthesize alkaloids is the main thesis of my doctoral work.

因此，我们希望发展一种简单高效的方法来有效地实现生物碱的合成，这就是本论文的主要目的。

Of course, alkaloids can serve as plant hormone as well.

当然，生物碱也可能作为植物的激素。

But the contents of alkaloids in the stalk and in the leaves are much lower.

但是茎、叶中总生物碱的质量分数很低。

Singer Leona Lewis and former Led Zeppelin guitarist Jimmy Page emerged as the bus transformed into a grass-covered carnival float, and the pair combined for a rendition of "Whole Lotta Love".

歌手leona刘易斯和前率领的飞艇的吉他手吉米页出现巴士转化为基层所涵盖的嘉年华花车，和一双合并为一移交&整个lotta爱&。

This is Kate, and that's Erin.

这是凯特，那个是爱朗。