isomerism

简明释义

英[aɪˈsɒmərɪzəm]美[aɪˈsɑːmərɪzəm]

n. 异性

英英释义

单词用法

同义词

反义词

例句

1.Objective to study the diagnostic significance of computed tomography (ct) in atrial isomerism.

目的研究心房异构的病理表现，探讨CT在心房异构诊断中的作用。

2.The database performance management system may through the data dictionary inquiry form realize monitoring under the distributional isomerism database environment based on the rule.

数据库性能管理系统可以通过数据字典查询来实现分布式异构环境下基于规则的监控。

3.The research showed that temperature affected the isomerism most, then the pressure of hydrogen and the concentrations of catalyst.

结果表明，温度对氢化反应的异构化影响较大，氢气压力和催化剂浓度对异构化的影响相对较小。

4.Based on the XML technology, XML data presentation, data manipulation and data storage structure and procedure are accomplished, which resolve the database and tax interface isomerism.

基于XML技术，设计、实现了XML数据表示、数据操作、数据存储等结构和过程，有效解决了数据库异构性和银税接口异构性问题。

5.Information such as the potential for isomerism, the identification of stereochemistry, or the potential for forming polymorphs should also be included.

潜在异构体，立体化学的识别，或潜在形成多晶型的信息因包含在内。

6.There was cis-trans isomerism on the system of SSBR/S/NS and the degree of cis-trans isomerism.

SSBR/S/NS体系存在顺反异构现象，顺反异构程度也存在。

7.The concept of isomerism 异构现象 is essential in biochemistry for understanding enzyme activity.

在生物化学中，isomerism 异构现象 的概念对于理解酶的活性至关重要。

8.Different isomerism 异构现象 can result in vastly different properties of compounds.

不同的isomerism 异构现象 可能导致化合物具有截然不同的性质。

9.There are two main types of isomerism 异构现象: structural and stereoisomerism.

有两种主要类型的isomerism 异构现象：结构异构和立体异构。

10.In organic chemistry, understanding isomerism 异构现象 is crucial for predicting the behavior of molecules.

在有机化学中，理解isomerism 异构现象 对于预测分子的行为至关重要。

11.The study of isomerism 异构现象 helps chemists design drugs that are more effective.

对isomerism 异构现象 的研究帮助化学家设计更有效的药物。

作文

Isomerism is a fascinating concept in chemistry that refers to the existence of two or more compounds with the same molecular formula but different structural arrangements or spatial orientations. This phenomenon can lead to significant variations in the properties and behaviors of these compounds, making it a crucial topic for chemists and students alike. Understanding isomerism (异构现象) not only enhances our knowledge of organic chemistry but also provides insights into the complexity of molecular interactions.There are two primary types of isomerism (异构现象): structural isomerism and stereoisomerism. Structural isomerism occurs when compounds have the same molecular formula but differ in the connectivity of their atoms. For instance, butanol (C4H10O) can exist as several structural isomers, including n-butanol, isobutanol, and tert-butanol. Each of these isomers has unique physical and chemical properties, which can affect their applications in various fields such as pharmaceuticals and industrial chemistry.On the other hand, stereoisomerism involves compounds that have the same molecular formula and connectivity of atoms but differ in the spatial arrangement of those atoms. This type of isomerism (异构现象) can be further classified into geometric isomerism and optical isomerism. Geometric isomers occur due to restricted rotation around double bonds, leading to cis and trans configurations. For instance, in the case of 2-butene, the cis isomer has both methyl groups on the same side of the double bond, while the trans isomer has them on opposite sides. These differences can significantly impact the compound's boiling points, solubility, and reactivity.Optical isomerism arises from the presence of chiral centers in a molecule, which are carbon atoms bonded to four different substituents. Such molecules can exist as non-superimposable mirror images, known as enantiomers. A classic example is the amino acid alanine, which can exist in two forms: L-alanine and D-alanine. These enantiomers can exhibit vastly different biological activities, which is particularly important in the field of drug design. The study of isomerism (异构现象) is thus critical for understanding how slight changes in molecular structure can lead to significant differences in function and activity.In conclusion, isomerism (异构现象) is a fundamental concept in chemistry that highlights the diversity and complexity of chemical compounds. By exploring the different types of isomerism (异构现象), we gain valuable insights into how molecular structure influences the properties and behavior of substances. This understanding is not only essential for academic purposes but also has practical implications in various industries, including pharmaceuticals, agriculture, and materials science. As we continue to study and explore the world of chemistry, the significance of isomerism (异构现象) will undoubtedly remain a vital area of interest.

异构现象是化学中一个引人入胜的概念，指的是存在两个或多个具有相同分子式但结构排列或空间取向不同的化合物。这种现象可能导致这些化合物在性质和行为上有显著差异，使其成为化学家和学生都非常重要的话题。理解异构现象不仅增强了我们对有机化学的认识，还提供了对分子相互作用复杂性的洞察。异构现象主要有两种类型：结构异构和立体异构。结构异构发生在化合物具有相同分子式但原子连接方式不同的情况下。例如，丁醇（C4H10O）可以以几种结构异构形式存在，包括正丁醇、异丁醇和叔丁醇。每一种异构体都有独特的物理和化学性质，这可能影响它们在制药和工业化学等各个领域的应用。另一方面，立体异构涉及到分子具有相同的分子式和原子连接方式，但原子的空间排列不同。这种类型的异构现象可以进一步分为几何异构和光学异构。几何异构由于双键周围的旋转受限而发生，导致顺式和反式构型。例如，在2-丁烯的情况下，顺式异构体的两个甲基在双键的同一侧，而反式异构体则在相对侧。这些差异会显著影响化合物的沸点、溶解度和反应性。光学异构源于分子中手性中心的存在，即四个不同取代基结合到碳原子上。这样的分子可以以不可叠加的镜像形式存在，称为对映体。经典的例子是氨基酸丙氨酸，它可以以两种形式存在：L-丙氨酸和D-丙氨酸。这些对映体可以表现出截然不同的生物活性，这在药物设计领域尤为重要。因此，研究异构现象对于理解分子结构的微小变化如何导致功能和活性的显著差异至关重要。总之，异构现象是化学中的一个基本概念，突显了化学化合物的多样性和复杂性。通过探索不同类型的异构现象，我们获得了关于分子结构如何影响物质性质和行为的宝贵洞察。这种理解不仅对学术目的至关重要，而且在制药、农业和材料科学等各个行业也具有实际意义。随着我们继续研究和探索化学世界，异构现象的重要性无疑将仍然是一个重要的研究领域。