四体

The lifetime of M intermediate of BRE194Q was less than 1.0 s by photomicrography. The lifetime of M intermediates of BRI119T/T121S/A126T and BRI119T/T121S/A126T/E194Q were 3.0 s and 2.0 s, respectively.

显微视频录像技术记录的PVA膜中样品的M态寿命表明，野生型BR的M态寿命最短，单突变体的M态寿命小于1.0 s，三突变体的寿命为3.0 s，四突变体的寿命为2.0 s。

The lifetime of M intermediate of the three mutants in PVA films were recorded by employing photomicrography. In distilled water, the visible absorption maximum of BRI119T/T121S/A126T and BRI119T/T121S/A126T/E194Q mutants were blue shifted notably by 11 and 12 nm respectively and the BRE194Q's was weakly red shifted in comparison with WT-BR.

与野生型BR相比较，在水溶液中，单突变体的可见吸收光谱的最大吸收峰发生了轻微红移，三突变体和四突变体的最大吸收峰则分别发生了11.0和12.0 nm的明显蓝移。

The lifetime of M intermediate of BR(subscript E194Q) was less than 1.0 s by photomicrography. The lifetime of M intermediates of BR(subscript I119T/T121S/A126T) and BR(subscript I191T/T121S/A126T/E194Q) were 3.0s and 2.0s, respectively.

显微视频录像技术记录的PVA膜中样品的M态寿命表明，野生型BR的M态寿命最短，单突变体的M态寿命小于1.0s，三突变体的寿命为3.0s，四突变体的寿命为2.0s。

The lifetime of M intermediate of the three mutants in PVA films were recorded by employing photomicrography. In distilled water, the visible absorption maximum of BR(subscript I119T/T121S/A126T) and BR(subscript I119T/T121S/A126T/E194Q) mutants were blue shifted notably by 11 and 12 mm respectively and the BR(subscript E194Q)'s was weakly red shifted in comparison with WT-BR.

与野生型BR相比较，在水溶液中，单突变体的可见吸收光谱的最大吸收峰发生了轻微红移，三突变体和四突变体的最大吸收峰则分别发生了11.0和12.0nm的明显蓝移。

The excited-state intramolecular proton transfer tautomerism reaction of 6-methyl-4-hydroxy pyri-midine monomers and dimmers was investigated by the ab initio method with the self-consistent reaction field with Tomas's polarized continuum mode and CIS theories at HF level on the basis of 6-311+G* and 6-31G basis set. By studying the potential energy surface, it was found that the monomer's ground-state proton transfer process together with the excited-state proton transfer process is a molecular system of four energy level, but dimmers were not, which can be used to explain the fact that UV-visible absorption and fluorescence spectra of monomer and dimers all corresponded to quinoid.

采用 ab initio HF理论的组态相关CIS方法和连续溶剂模型PCM，分别在6-311+G*和6-31G水平上研究了6-甲基-4-羟基嘧啶单体及二聚体激发态质子转移的异构化反应；对其反应势能面的研究发现，单体基态和激发态的异构化反应一起可以形成四能级的分子电子体系，而二聚体的却不能，由此解释了单体和二聚体的紫外吸收光谱和荧光发射光谱均对应于酮式构型的原因。

In order to assure that the plant can be safely shutdown and to comply with the requirement of 10CFR 50.62, various ATWS prevention mitigation features have been implemented in the design of Lungmen Plant, including Fine Motion Control Rod DriveRun In, Alternate Rod Insertion, Automatic Initiation of Standby Liquid Control System, Reactor Internal Pump Trip/ Runback, Feedwater Flow Runback, and Inhibition of Automatic Depressurization System.

摘要 核四厂属进步型沸水式核能电厂，其采用数位式仪控系统设计，考虑设计上可能存在软体共因失效问题，导致反应器无法顺利急停，产生预期暂态未急停（Anticipated Transient Without Scram， ATWS）事件，为确保反应器安全，并符合10CFR 50.62法规要求，电厂设计上装设有缓抑ATWS事故之软体与硬体设施，包括微调控制棒驱动机构插入、替代性控制棒插入、备用硼液控制系统自动启动、炉内泵跳脱、炉内泵回退、饲水回退与禁止自动释压系统开启等型态。

If such gametophytes produce fertile gametes, the resulting sporophyte is then tetraploid, and large polyploid series may subsequently be developed.

如果这种配子体能够产生可育的配子，那么形成的孢子体通常是四倍体，这样就可以得到大量的多倍体。

A high performance liquid chromatographic method was established for determination of caffeic acid contents in tetraploidy taraxacum officinale and diplontic taraxacum dissectum.

本文采用四倍体药蒲公英和二倍体多裂蒲公英为材料，通过HPLC法测定并比较两种蒲公英中咖啡酸的含量，以大力推广产量高，抗逆性强，药用活性成分高的优质多倍体蒲公英新品种。

The result showed that the plant of Maicao No. 9 was tall, with good fecundity, fully filled grain and vigorous growth. The chromosome number of the root cells was 2n=56, through the observation of pollen mother cells meiosis, there were a certain amount of univalents, ring bivalents and bar bivalents in PMCM. Different numbers of lagging chromosomes, chromosome bridges and micronucleus were found in anaphaseⅠ, anaphaseⅡ and tetraspore.

结果表明：麦草9号植株高大，结实性较好，籽粒饱满，生长旺盛；根尖细胞染色体数目为2n=56，对其进行花粉母细胞减数分裂观察，中期Ⅰ具有一定数量的单价体、环状二价体、棒状二价体；后期Ⅰ、后期Ⅱ与四分体时期都出现不同数量的落后染色体、染色体桥、微核等现象。

Experimental mice were exposed to Trypanosome evansi after injection by different doses of antigenic reservoir. The results showed that 20 μg dose produced 83% and 67% protection to 2 sample variations after 4 immunizations. However, 3 immunizing doses could not give good protection. No protective effects were detected when experimental animals immunized by single VSG exposed to isotype from different rabbits.

用不同剂量抗原库免疫小鼠后进行攻虫，结果显示：经四次免疫后，20μg 剂量对随机抽取的两个变异体100 条虫体的保护率分别达到 83%和 67%；改变免疫方法，经三次免疫后的保护效果不理想；用单一 VSG 抗原免疫小鼠，接种来自不同兔体的同型虫体，不能起到相应保护作用。

I didn't watch TV last night, because it .

昨晚我没有看电视，因为电视机坏了。

Since this year, in a lot of villages of Beijing, TV of elevator liquid crystal was removed.

今年以来，在北京的很多小区里，电梯液晶电视被撤了下来。