查询词典 carbon

The change of the position of the benzene ring has little effect on γ cmc-The interfacial tension behavior of this series of alkylbenzenesulfonates with carbon number 14,16,18 was investigated in alkane/aqueous system, it is found that alkylbenzenesulfonates of 16 total alkyl carbon number is the best.

通过对单烷基苯磺酸盐和二烷基苯磺酸盐的降低界面张力能力的比较，结果表明附加基团在一定程度上可以改善烷基苯磺酸盐降低界面张力的能力，而且使达到最低界面张力所需的最佳碱度要小。

"Carbon dating:The determination of the approximate age of an ancient object, such as an archaeological specimen , by measuring the amount of carbon 14 it contains."

碳定年：通过测量古代文物，如考古标本中碳-14的含量，从而测定该古物的大致年代。

Wherein X represents a hydrocarbon group or hiydrocylhy-drocarbon group having 1 to 14 carbon atoms, a represents an integer of 1 to 6,b represents an integer of 1 to 5,R's represent a hydrogen atom,a halogen atom,a hydrocarbon group having 1 to 8 carbon atoms or an aryl,group independently from each other,and n represents an average number which is 1 to 10 and4,4'dihydroxybiphenyl,and having a softening point of not higher than 120℃,and not lower than 60℃.

其中x是一个油气组或hiydrocylhy-油气群有1至14个碳原子， a代表整数1到6，B代表整数1到5，R的是氢原子，卤素原子，烃类组有1至8个碳原子或一个芳，77独立于对方，而n是一个平均这个数字是1至10条和第4，4'dihydroxybiphenyl，并有软化点不高于120℃，不得低于60℃。

So if the old theory that we die with the heart cells we are born with is true, then people born before carbon 14 got into the food chain (nuclear testing didn't start until 1955) wouldn't have any carbon 14 in their heart cells.

如果根据心肌细胞不可再生理论，那么在C14进入食物链之前（1955年核试验开始前）出生的人心肌细胞内不会有C14，但事实并非如此，这些人的心肌细胞不仅含有C14，研究者还测定出了C14存在体内的时间。

Unlike the constituents of living organisms, fossil fuels contain little or none of the radioactive form of carbon: the carbon 14 isotope, which has eight neutrons in the nucleus rather than the usual six.

和生物体组成不同的是，化石燃料的放射性同位素碳14（原子核内有8个中子，一般碳原子只有6个）含量非常低，有些甚至没有。

The spore germination rate, growth, sporulation and extracellular protease of Beauveria bassiana HFW-05 were investigated with 14 carbon sources and 11 nitrogen sources in media without any carbon and nitrogen nutrition.

在基础培养基中添加14种碳源和11种氮源测定，球孢白僵菌HFW-05菌株的萌发率、生长速率、产孢量及胞外蛋白酶活性。

Diels-Alder reaction has been one of the cornerstone reactions in organic chemistry for the construction of six-membered rings and the formation of carbon-carbon binds.

Diels-Alder 反应是有机化学中建构六员环和碳碳键生成最为重要的反应之一。

The results show that during the development of the oriental tobacco leaves, the activity of acid invertase was decreased; the changes of GS reached its peak in the 20dans in Samsun, but in the 30dans in Basma and Canik ;the activity of PAL was decreased in the 30dans; The content of total nitrogen was decreased with the mature leaves, but nicotine、total carbon and soluble total sugar were increased. Different varieties, carbon and nitrogen metabolism key enzyme activity and the content of metabolites were different.

结果表明，在香料烟叶片发育过程中，酸性转化酶的活性均呈下降趋势；谷氨酰胺合成酶的活性Samsun品种在20d叶龄时最高，而Basma和Canik在30d叶龄时最高；苯丙氨酸解氨酶的活性均表现为30d时最低；随着叶片成熟总氮含量降低，烟碱含量升高，总碳、可溶性总糖随着叶片成熟其含量呈升高趋势；品种不同，碳氮代谢关键酶的活性及代谢产物的含量变化均有很大差异。

The structure and carbon flow of community in the pack ice, the contribution of ice community to the vertical carbon flux in the pack ice zone, and the adaptation of ice community to the micro-environments of sea ice were studied in the Canadian Basin and Greenland Sea through five Arctic cruises (the First and Second Chinese Arctic Expeditions, the 15th and 18th Germany "Polarstern" Arctic Cruises, and US-Canadian Joint "Louis St. Laurent" Canadian Basin Cruise).

本研究通过我国首次和第二次北极科学考察、参与德国第15和18北极航次和美-加2002北极航次等5个航次的调查，对北极夏、秋季浮冰的环境特性、生物群落结构和生物量、生物群落碳流、浮冰生物群落对浮冰区真光层垂向碳通量的贡献以及浮冰细菌的环境适应性进行了研究。

A novel inlaid super-thin microcrystalline cellulose modified carbon paste film electrode was fabricated by direct inlaying microcrystalline cellulose modified carbon paste film on the surface of nichrome substrate.

以镍铬合金为基体，在其表面通过直接嵌入微晶纤维素修饰的碳糊膜，构建了嵌入式超薄微晶纤维素／碳糊电极。

This one mode pays close attention to network credence foundation of the businessman very much.

这一模式非常关注商人的网络信用基础。

Cell morphology of bacterial ghost of Pasteurella multocida was observed by scanning electron microscopy and inactivation ratio was estimated by CFU analysi.

扫描电镜观察多杀性巴氏杆菌细菌幽灵和菌落形成单位评价遗传灭活率。