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相关概念视频

Stereoisomerism02:52

Stereoisomerism

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Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula.
Transition metal complexes often exist as geometric isomers, in which the same atoms are connected through the same types of bonds but with differences in their orientation in space. Coordination complexes with two different ligands in the cis and trans positions from a ligand of interest form isomers. For example, the octahedral [Co(NH3)4Cl2]+ ion has two isomers (Figure 1) In the cis...
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Position-effect Variegation02:32

Position-effect Variegation

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In 1928, a German botanist Emil Heitz observed the moss nuclei with a DNA binding dye. He observed that while some chromatin regions decondense and spread out in the interphase nucleus, others do not. He termed them euchromatin and heterochromatin, respectively. He proposed that the heterochromatin regions reflect a functionally inactive state of the genome. It was later confirmed that heterochromatin is transcriptionally repressed, and euchromatin is transcriptionally active chromatin.
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Stereoisomers02:32

Stereoisomers

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On the basis of mirror symmetry, stereoisomers of an organic molecule can be further classified into diastereomers and enantiomers. Diastereomers are stereoisomers that are not mirror images of each other. Substituted alkenes, such as the cis and trans isomers of 2-butene, are diastereomers, as these molecules exhibit different spatial orientations of their constituent atoms, are not mirror images of each other, and do not interconvert. Here, the interconversion is suppressed due to...
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Isomerism in Alkenes02:01

Isomerism in Alkenes

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Alkenes like 1-butene and 2-butene exhibit constitutional isomerism, as they differ in the position of the double bond. Further, 2-butene exhibits stereoisomerism and exists as two distinct compounds differing in spatial arrangement.
An isomer is called cis-2-butene when the methyl groups are on the same side of the double bond, and the other stereoisomer, in which methyl groups are on the opposite side of the double bond, is called trans-2-butene. The cis and trans stereoisomers are not...
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Multiple Allele Traits01:49

Multiple Allele Traits

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The Concept of Multiple Allelism
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Structural Isomerism02:34

Structural Isomerism

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Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula. Structural isomerism of coordination compounds can be divided into two subcategories, the linkage isomers and coordination-sphere isomers.
Linkage isomers occur when the coordination compound contains a ligand that can bind to the transition metal center through two different atoms. For example, the CN− ligand can bind through the carbon atom or through the nitrogen atom. Similarly, SCN− can...
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Heterokaryon Technique for Analysis of Cell Type-specific Localization
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Heterokaryon Technique for Analysis of Cell Type-specific Localization

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异构性异构性是不同的.

Mathias Scharman1, Michael Lenhard1

  • 1Institute for Biochemistry and Biology, University of Potsdam, Karl-Liebknecht-Str. 24-25, D-14476 Potsdam-Golm, Germany.

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|March 12, 2024
PubMed
概括
此摘要是机器生成的。

异构是植物具有多种花型的花特征. 这种现象影响了植物的繁殖和进化.

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科学领域:

  • 植物学 植物学
  • 进化生物学 进化生物学
  • 植物科学 植物科学

背景情况:

  • 植物形态变异对于理解植物生殖策略至关重要.
  • 异构性,一种特定类型的花多态性,在一个物种中呈现出明显的花茎和花布局.

研究的目的:

  • 引入和定义异构为植物生殖生物学中的一个关键概念.
  • 强调花形式的形态多样性的重要性.

主要方法:

  • 花结构的描述性分析.
  • 种群内的不同花型的比较形态.

主要成果:

  • 鉴定异构为开花植物中普遍存在的现象.
  • 在花的形态上,表现出花茎和花呈现的明显形态差异.

结论:

  • 异常性代表了一种显著的进化适应,影响了植物交配系统.
  • 对植物育种和保护领域的研究来说,了解异构是必不可少的.