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^13C

^13C

^13C

^13C

1

Aim : nuclear magnetic resonance spectrum of calycosin was studied , and its chemical shifts of 13C NMR were attributed .

目的：研究了毛蕊异黄酮的核磁共振波谱学，并对其 13CNMR 进行归属。

4

This caused a massive release of 12C-rich methane into the atmosphere , explaining the initial drop in 13C concentrations .

这导致 12C 被大规模释放到大气中，也解释了 13C 浓度最初下降的原因。

6

The structures of the new intermediates and target compounds are confirmed by 1H NMR, 13C NMR, IR, and MS spectra .

所有的目标化合物和一些中间体化合物的结构都经过 1HNMR 、13CNMR 、IR 及 MS 得到了确认。

8

Non-radioactive carbon comes in two forms : 12C and the heavier (and much rarer form ) 13C.

非放射性碳以两种形式存在：12C 还有较重（并且更罕见）的 13C 。

9

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The structures of the intermediates and the target compound were confirmed by MS, 1H NMR and 13C NMR spectra in our experiments.

关键中间体及最终化合物的结构经质谱、核磁共振氢谱及碳谱得到确证。

11

No apparent toxicity was observed in 13C-octanoic acid abnormal toxicity test .

13C-辛酸异常毒性试验未见明显毒副反应。

12

Methods 13C-octanoic acid was synthesized with Grignard method .

方法 13C-辛酸采用格利雅方法合成标记。

13

The chemical shifts of 1H and 13C have been calculated with ab initio and DFT, all of which are compared with the experimental results .

用从头算法和密度泛函方法计算了碳和氢的化学位移，并与实验结果进行了比较。

14

Methods 13C-labelled urea breath test (13C-UBT) was conducted in 2512 health-examined individuals .

方法对 2512 例健康体检人员进行 13C 尿素酶呼气试验（13C-UBT ）检测分析。

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Results The structure of the target molecule was identified by 1H NMR, 13C NMR and element analysis .

结果最终产物由核磁共振谱和元素分析进行结构鉴定。

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abstract: Objective To observe the effect of xylitol on the texture of reagents used in13C- urea breath test and the value of DOBtest.

目的观察木糖醇对 13C-尿素呼气试验检测试剂的口感及 DOB 检测值的影响。

17

The routine chemical analysis means and 13CNMR spectra were employed to learn the relations of structure and quality of UF resin .

采用常规化学分析和 ^13C 核磁共振相结合的方法，分析研究了脲醛树脂胶粘剂性能与结构的关系。

18

The method is also suitable to label plant with 13C and 15N isotope .

该方法亦适合于采用 14C 、15N 等同位素对植物进行标记和示踪。

19

It can aid people to elucidate the 13C-NMR spectra of steroidal natural products effectively .

能有效地辅助人们对甾体类天然产物 ~（13 ）C-NMR 图谱的解析。

20

Average temperature of a month is 7-13C (45-55F) that is higher than its nearby cities , such as Chengdu , Chongqing and Kunming .

月平均温度是 7到13 摄氏度，很明显高于附近的成都，重庆，昆明等城市。

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