isomer

简明释义

英[ˈaɪsəmə(r)]美[ˈaɪsəmər]

n. [化学] 同分异构物；[核] 同质异能素

英英释义

单词用法

同义词

反义词

例句

1.There are many helixes of dihedral Angle, and the whole skeleton forms a large helix in the structure of the rotatory isomer.

其结构中包含许多二面角螺旋，而且具有旋光性的异构体，其结构的整体骨架也构成一个大的螺旋。

2.Special reagent for diagnosing and treating disease based on VEFG, HER-2, PSA protein isomer.

基于VEFG,HER - 2,PS A蛋白质异构体的用于诊断和治疗的疾病的特效试剂。

3.The boat conformation of its geometric isomer, dysamide C (2) studied by X-ray diffraction analysis is described.

描述了通过X 射线衍射分析研究的其几何异构体dysamideC（2）的船形。

4.At the same time, this paper also split the R-isomer of racemic to change and re-recovery.

同时本论文也对拆分后的R型异构体进行转变消旋而重回收。

5.In weak covalent compounds, the isomer with the maximum SAS (Solid Angle Factor Sum) of the ligand-occupied seats is more favourable for ligand packing.

在弱共价键化合物中，占据座位SAS(立体角系数扣)值最太的异构体有利于配体堆积。

6.In weak covalent compounds, the isomer with the maximum SAS (Solid Angle Factor Sum) of the ligand-occupied seats is more favourable for ligand packing.

在弱共价键化合物中，占据座位SAS(立体角系数扣)值最太的异构体有利于配体堆积。

7.The product was determined containing CGA's isomer and isochlorogenic acid by LC-MS test.

从LC-MS检测结果推断，产品中含有绿原酸异构体和异绿原酸。

8.In chemistry, an isomer 异构体 is a compound that has the same molecular formula as another compound but a different arrangement of atoms.

在化学中，isomer 异构体是指与另一种化合物具有相同分子式但原子排列不同的化合物。

9.There are two main types of isomers 异构体: structural isomers 结构异构体 and stereoisomers 立体异构体.

有两种主要类型的isomers 异构体：结构isomers 结构异构体和立体isomers 立体异构体。

10.Glucose and fructose are examples of isomers 异构体 that have the same formula but different structures.

葡萄糖和果糖是具有相同分子式但结构不同的isomers 异构体的例子。

11.The study of isomers 异构体 can help chemists understand the properties of different substances.

对isomers 异构体的研究可以帮助化学家理解不同物质的性质。

12.Some isomers 异构体 can have vastly different biological activities despite having the same atoms.

一些isomers 异构体尽管具有相同的原子，但可能具有截然不同的生物活性。

作文

In the fascinating world of chemistry, the concept of isomer (异构体) plays a crucial role in understanding the diversity and complexity of chemical compounds. An isomer is defined as a compound that has the same molecular formula as another compound but differs in the arrangement of atoms within the molecule. This unique characteristic leads to different properties and behaviors, which can significantly impact their applications in various fields, including pharmaceuticals, materials science, and biochemistry. To illustrate the importance of isomers (异构体), let us consider glucose and fructose. Both compounds share the same molecular formula, C6H12O6, yet they exhibit distinct structural arrangements. Glucose is an aldohexose, meaning it contains an aldehyde group, while fructose is a ketohexose with a ketone group. This subtle difference in structure results in varying sweetness levels, metabolic pathways, and biological functions. Such examples highlight how isomers can affect not only the physical properties of substances but also their physiological roles in living organisms. Furthermore, isomers can be classified into several categories, including structural isomers (结构异构体) and stereoisomers (立体异构体). Structural isomers differ in the connectivity of their atoms. For instance, butane and isobutane are structural isomers of C4H10. Although they contain the same number of carbon and hydrogen atoms, their different structures lead to varied boiling points and densities. On the other hand, stereoisomers have the same connectivity but differ in the spatial arrangement of their atoms. A common example is cis-trans isomerism found in alkenes, where the orientation of substituents around a double bond influences the compound's physical and chemical properties. The study of isomers is not only academically intriguing but also practically significant. In the pharmaceutical industry, the distinction between isomers can be a matter of life and death. Many drugs exist as isomers, and often, only one form is therapeutically active while the other may be inactive or even harmful. For example, the drug thalidomide was prescribed in the 1960s as a sedative but caused severe birth defects because one of its isomers was teratogenic. This tragic event led to stricter regulations regarding drug approval and highlighted the importance of understanding isomers in medicinal chemistry. Moreover, the field of green chemistry is increasingly focusing on isomers to develop more sustainable processes. By understanding the behavior of isomers, chemists can design reactions that favor the formation of desired products while minimizing waste. This approach not only enhances efficiency but also reduces the environmental impact of chemical manufacturing. In conclusion, the concept of isomer (异构体) is fundamental to the study of chemistry, providing insight into the complexity of molecular structures and their implications for various applications. From the sweetness of sugars to the efficacy of drugs, isomers illustrate the profound impact of molecular arrangement on the properties and functionalities of compounds. As we continue to explore the vast realm of chemistry, the significance of isomers will undoubtedly remain a pivotal topic in both research and practical applications.

在化学的迷人世界中，isomer（异构体）这一概念在理解化合物的多样性和复杂性方面发挥着至关重要的作用。isomer 被定义为与另一种化合物具有相同分子式但在分子内部原子排列上有所不同的化合物。这种独特的特征导致了不同的性质和行为，这可能会显著影响它们在制药、材料科学和生物化学等各个领域的应用。 为了说明isomers（异构体）重要性，让我们考虑葡萄糖和果糖。这两种化合物共享相同的分子式 C6H12O6，但它们表现出不同的结构排列。葡萄糖是醛糖，意味着它含有醛基，而果糖是酮糖，含有酮基。这种微妙的结构差异导致了不同的甜度水平、代谢途径和生物功能。这些例子突出了isomers如何影响物质的物理性质以及它们在生物体中的生理角色。 此外，isomers 可以分为几类，包括结构isomers（结构异构体）和立体异构体（立体异构体）。结构isomers 在原子的连接方式上有所不同。例如，丁烷和异丁烷是 C4H10 的结构isomers。尽管它们含有相同数量的碳和氢原子，但不同的结构导致了不同的沸点和密度。另一方面，立体异构体具有相同的连接性，但在原子的空间排列上有所不同。常见的例子是烯烃中的顺反异构现象，在双键周围取代基的方向影响化合物的物理和化学性质。 对isomers的研究不仅在学术上引人入胜，而且在实际应用中也具有重要意义。在制药行业，isomers之间的区别可能是生死攸关的问题。许多药物以isomers的形式存在，而通常只有一种形式具有治疗活性，而另一种可能是无效的甚至有害的。例如，沙利度胺在1960年代被处方作为镇静剂，但由于其其中一个isomer具有致畸性而导致严重的出生缺陷。这一悲剧事件促使了更严格的药物审批法规，并强调了在药物化学中理解isomers的重要性。 此外，绿色化学领域越来越关注isomers，以开发更可持续的过程。通过理解isomers的行为，化学家可以设计反应，以促进所需产品的形成，同时最小化废物。这种方法不仅提高了效率，还减少了化学制造对环境的影响。 总之，isomer（异构体）的概念是化学研究的基础，为我们提供了对分子结构复杂性及其对各种应用影响的深入了解。从糖的甜度到药物的疗效，isomers 展示了分子排列对化合物性质和功能的深远影响。随着我们继续探索化学的广阔领域，isomers 的重要性无疑将继续成为研究和实际应用中的关键主题。