化学

Study on the Chemical Consitituents of Helianthus Annuus, Vernonia Cumingiana and Eritrichium Rupestre

向日葵，毒根斑鸠菊和石生齿缘草化学成分研究向日葵，毒根斑鸠菊和石生齿缘草化学成分研究

The contrast of chemical communication behavior between males and females in non-breeding seasonThe chemical communication behavior of females depend more on vomeronasal system, compared with males in non-breeding season.

非繁殖期雌雄性小熊猫化学通讯行为的差别在非繁殖期，雌性小熊猫的化学通讯行为比雄性个体更多地依赖犁鼻系统。

Keeping balncc of oxidation-reduction equation is a difficult problem in the chemical teaching, especially in high school. The author induced from a great wany materials a new mcthod, namely,"grasp one molecule", which is readily accepted by strdents.

氧化——还原方程式的配平是化学教学中的难题，特别在高中化学中，学生尤感困难，本文是作者从自身氧化还原反应，有单质参加和有单质生成的氧化还原反应诸方面归纳出一种学生易于接受的方法即&抓1分子法&。

School of Chemistry and Chemical Engineering , Sun Yat - Sen University , Guangzhou , Guangdong 510275, China

1中山大学化学与化学工程学院，广州，广东，510275

The results showed: 1 RN didn't the leaf width,leaf long,leaf area,yield,productive value and average price of flue-cured tobacco,but had significant effect on grad composing,content of chemical component and the accumulation of N,K and Cl.Within limited rang of RN,the relations between yield,average price,yield of high grad tobacco,yield of low grad tobacco,nicotin,N,reducing sugar,Cl,amylum,volatile base and the quotient of ammonium would been described by significant quadratic polynomial,and the relations between K and the quotient of ammonium conformed to negative linear equation;2With a RN of 75%∶25%,the value of proportion of high and middle grad tobacco,content of nicotin,N,K,uptake of N and K/Cl were the highest,volatile base was lowest.

结果表明：1RN对烤烟的农艺性状、产量、产值、均价等没有明显影响，而对烤烟的等级结构、内在化学成分含量、氮、钾、氯的吸收量有着显著影响，可以用显著的二次多项式模型或直线相关方程描述产值、均价、上等烟产量、下等烟产量等经济性状以及烟碱、总氮、钾、还原糖、氯、淀粉、挥发碱等内在化学成分的含量与铵态氮份额之间的关系；2RN为75%∶25%时，中上等烟比例、烟碱、总氮、钾、钾氯比、氮吸收量最高，挥发碱含量最低。

The assay of the coarse protein , a variety of amino acid about nematode-trapping fungus — Arthrobotrys oligospora strain A1 and the third stage larva showed that the contents of the coarse protein and a variety of amino acid of larva are mostly higher than that of predacious organs containing annulus and cohesive net ,conidia and hypha in the different growth phases.

捕食线虫性真菌——少孢节丛孢菌菌株及线虫第三期幼虫的粗蛋白质和各种氨基酸种类及其含量化学成份测定结果表明：捕食线虫性真菌—少孢节丛孢菌的各生长阶段和线虫幼虫的粗蛋白质和氨基酸的种类和含量比较显示：线虫幼虫的粗蛋白质和各种氨基酸的含量大多数都高于少孢节丛孢菌捕食器、分生孢子、和菌丝的含量；结果还说明：捕食器菌丝的化学组成也与普通菌丝不一样。

The bacteria's genes were all constructed in the laboratory "from four bottles of chemicals on a chemical synthesiser, starting with information on a computer," he said.

他表示，这一人造细菌的基因均在实验室内构建，&从电脑上的信息开始，使用四瓶化学物质和一台化学合成装置来构建的。&

Chemistry synthetical DNA and RNA's orientation cleavage tool is 80 years that has began to develop a kind of new-fashioned non-enzyme cleaver called chemical nucleases.

化学合成的DNA、RNA定位断裂工具是20世纪80年代开始发展起来的一类新型的非酶断裂工具，称为化学核酸酶。

In the narrow sense, it refers to some fundamental spirit and agglomerating force that come into being in the production and management practices of an enterprise, as well as the common values and norms of behavior shared by the whole staff.

我们无法区分哪些成就是我们自身努力的成果，哪些成果是由我们大脑里的化学物质造成的。的成果，哪些成果是由我们大脑里的化学物质造成的。

Ca2+-ATPase and acid phosphatase of fiber in Phyllostachys edulis culms during secondary wall formation were studied. Early, intact double karyotheca remained in fiber nucleus, while nuclear chromatin agglutinated.

利用显微和细胞化学方法，对毛竹茎秆纤维次生壁形成过程中超微结构变化以及ATP酶、Ca2+-ATPase和酸性磷酸酶的超微细胞化学定位进行了研究。

In the negative and interrogative forms, of course, this is identical to the non-emphatic forms.

。但是，在否定句或疑问句里，这种带有"do"的方法表达的效果却没有什么强调的意思。

Go down on one's knees;kneel down

屈膝跪下。。。下跪祈祷