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The excimer laser produces radiation with high photon energy which is capable of breaking the molecular bonds to ablate the cornea directly.

ArF准分子激光由于光子能量大,可打断分子键,直接达到切割和消融角膜组织的目的。

The diverse types of tracheary elements and perforation plates in secondary xylem of A. asiatica show that previous knowledge about the tracheary elements and perforation plates in secondary xylem of A. asiatica is not complete and thus any inferences about the aboriginality and evolution of a taxon made depending on these traits are not reliable.

根据类叶升麻次生木质部中多变的管状分子类型,认为以往积累的有关毛茛科植物管状分子类型及导管穿孔板类型是不全面的,因此以该性状为参考作出的有关某一个类群的原始性和进化性的推论也是不可靠的。

Most of the molecular characteristic absorption is very weak, and the absorption line width is very narrow that can't be measured by traditional methods.

TDLAS系统的关键是利用激光二极管有很高光谱分辨率和可调谐性的特点,可以对特定分子在特定光谱范围内的一条振转线的光谱吸收进行测量而反演吸收气体的浓度,而且能够把待测分子与背景的干扰区分开来。

Cascades were calculated for various key relative molecular mass,which is the average relative molecular mass of two key components in a matched abundance ratio cascade.

在匹配丰度级联中,关键相对分子质量是两个关键组分相对分子质量的平均值。

The MS showed that the ratio of relative abundance ratio of two main Se isotopes is about 2:1, which can give important information for identifying molecular or fragile ions of selenium.

所有化合物均可获得特徵质谱,表现出含单个硒原子的分子离子或碎片离子特徵峰簇,硒的两种主要同位素在峰簇中表现为主要峰M与(M-2)的相对丰度比约为2:1,可为鉴定含硒分子离子或碎片离子提供重要信息。

Peptide A molecule consisting of a number of amino acid molecules linked together.

肽:由许多氨基酸分子连接而成的分子,可以认为肽由缩合反应形成。

At present, the understanding of ecology of acidophilic microorganisms is mainly based on the traditional pure culture and isolation techniques. However, the development of molecular biology provides more scientific methods. The combination of pure culture and isolation techniques with molecular biotechnology will provide more effective methods in this field.

目前对嗜酸微生物生态学的理解主要基于传统的纯菌培养分离技术,但是分子生物学技术的发展提供了更科学的研究手段,将纯菌培养分离技术和分子生物学技术相结合是研究嗜酸微生物生态的有效方法。

The distillate stream followed by saponification and acidulation was directly to concentrate VE by molecular distillation.

分子蒸馏馏出液经皂化、盐酸酸化、水洗干燥后作为分子蒸馏浓缩VE原料。

In this dissertation, the efforts were focused on design and synthesis of new types of chiral and achiral azoamide hosts,bowl-shaped steroid cholic acid methyl esters with one chiral arm under microwave irradiation and heteroaromatic molecular tweezers under microwave irradiation in solid state and their molecular recognition as well as enantioselective recognition.

本文致力于新型手性不对称脲、胆甾和芳杂环类分子钳受体的设计合成及其对阴离子、中性分子和手性分子的识别及对映选择性识别性能研究,取得了一系列具有重要学术意义与应用前景的创新性结果。

Recently, the cDNA encoding PTA1 has been cloned from activated Jurkat cells by Sherrington and show it to be a novel member of the immunoglobulin superfamity with the unusual structure of two V domains only. This result provided a fundamental base for further study on PTA1 functions and its ligand identification.

从核苷酸推导的氨基酸序列表明PTA1由334个氨基酸组成,先导序列18个氨基酸,成熟PTA1分子为316氨基酸,胞膜外区232个氨基酸有两个Ig样结构域,属于免疫球蛋白超家族成员,胞浆区59个氨基酸中,含有3个酪氨酸,6个丝氨酸和6个苏氨酸,有PKC和PTK作用的基序,这些特征都与PTA1分子的功能密切相关,因此PTA1 cDNA克隆成功为进一步深入研究PTA1分子的作用机理奠定了坚实的基础。

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