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関連する概念動画

Lampbrush Chromosomes01:51

Lampbrush Chromosomes

8.0K
In 1882, Flemming observed lampbrush chromosomes (LBC) in salamander eggs. Later in 1892, Rückert observed LBCs in shark egg cells and coined the term "lampbrush chromosomes" because they looked like brushes used to clean kerosene lamps.
LBCs are made up of two pairs of conjugating homologous chromatids. Each chromatid consists of alternatively positioned regions of condensed-inactive chromatin and loosely placed-active side loops, which can be contracted and extended. The loops...
8.0K
Synthesis of α-Substituted Carbonyl Compounds: The Stork Enamine Reaction01:26

Synthesis of α-Substituted Carbonyl Compounds: The Stork Enamine Reaction

3.5K
α-Substituted ketones or aldehydes can be synthesized from enamines by the Stork enamine reaction, named after its pioneer Gilbert Stork. Enamines are useful synthetic intermediates where the lone pair on nitrogen is in conjugation with the C=C bond. They resemble enolate ions, as the resonance forms of both species have a nucleophilic α carbon.
3.5K
Photochemical Electrocyclic Reactions: Stereochemistry01:26

Photochemical Electrocyclic Reactions: Stereochemistry

1.9K
The absorption of UV–visible light by conjugated systems causes the promotion of an electron from the ground state to the excited state. Consequently, photochemical electrocyclic reactions proceed via the excited-state HOMO rather than the ground-state HOMO. Since the ground- and excited-state HOMOs have different symmetries, the stereochemical outcome of electrocyclic reactions depends on the mode of activation; i.e., thermal or photochemical.
Selection Rules: Photochemical Activation
1.9K
Chromatography: Introduction01:10

Chromatography: Introduction

4.6K
Chromatography is a technique used to separate compounds based on differences of partitioning between two phases, the stationary phase and the mobile phase.
The phase in which the compounds linger or on which the compounds adsorb is called the stationary phase, whereas the mobile phase is the solvent that carries the solutes to be analyzed. In traditional column chromatography, the mixture flows through the stationary phase, and the compounds partition between the stationary and mobile phases...
4.6K
α-Bromination of Carboxylic Acids: Hell–Volhard–Zelinski Reaction01:15

α-Bromination of Carboxylic Acids: Hell–Volhard–Zelinski Reaction

3.2K
The method to achieve α-brominated carboxylic acids using a mixture of phosphorus tribromide and bromine is known as the Hell–Volhard–Zelinski reaction. The reaction is catalyzed by phosphorus tribromide, which can be used directly or produced in situ from red phosphorus and bromine. The mechanism comprises PBr3 catalyzed conversion of acid to acid bromide and hydrogen bromide. The acid bromide enolizes to its enol form in the presence of HBr. The nucleophilic enol attacks the...
3.2K
Aryldiazonium Salts to Azo Dyes: Diazo Coupling01:11

Aryldiazonium Salts to Azo Dyes: Diazo Coupling

3.1K
The reaction of weakly electrophilic aryldiazonium (also called arenediazonium) salts with highly activated aromatic compounds leads to the formation of products with an —N=N— link, called an azo linkage. This reaction, presented in Figure 1, is known as diazo coupling and occurs without the loss of the nitrogen atoms of the aryldiazonium salt. Highly activated aromatic compounds such as phenols or arylamines favor the diazo coupling reaction. The coupling generally occurs at the...
3.1K

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関連する実験動画

Updated: Sep 9, 2025

Chromosomics: Detection of Numerical and Structural Alterations in All 24 Human Chromosomes Simultaneously Using a Novel OctoChrome FISH Assay
06:25

Chromosomics: Detection of Numerical and Structural Alterations in All 24 Human Chromosomes Simultaneously Using a Novel OctoChrome FISH Assay

Published on: February 6, 2012

19.0K

染色体合成

Franck Pellestor1,2, Jean Baptiste Gaillard3, Benjamin Ganne3,4

  • 1Unit of Chromosomal Genetics and Research Platform Chromostem, Department of Molecular Genetics and Cytogenomics, Site Unique de Biologie (SUB), Montpellier CHU, Montpellier Cedex 5, France. f-pellestor@chu-montpellier.fr.

Methods in molecular biology (Clifton, N.J.)
|August 30, 2025
PubMed
まとめ
この要約は機械生成です。

クロモアシンセシスは 異なる染色体再編成プロセスで 欠陥のあるDNA複製から生じる. これは FoSTeSやMMBIRのようなメカニズムで 生まれながらの病気や癌で 見られる複雑な再編成につながります

キーワード:
染色体合成生まれつきの病気複製するフォストスMMBIR についてマイクロホモロジーマイクロ核複製のストレストリプリケーション

さらに関連する動画

Chromatin Immunoprecipitation in the Cnidarian Model System Exaiptasia diaphana
11:48

Chromatin Immunoprecipitation in the Cnidarian Model System Exaiptasia diaphana

Published on: March 17, 2023

536
Synthesis of Hypervalent Iodonium Alkynyl Triflates for the Application of Generating Cyanocarbenes
12:27

Synthesis of Hypervalent Iodonium Alkynyl Triflates for the Application of Generating Cyanocarbenes

Published on: September 8, 2013

11.0K

関連する実験動画

Last Updated: Sep 9, 2025

Chromosomics: Detection of Numerical and Structural Alterations in All 24 Human Chromosomes Simultaneously Using a Novel OctoChrome FISH Assay
06:25

Chromosomics: Detection of Numerical and Structural Alterations in All 24 Human Chromosomes Simultaneously Using a Novel OctoChrome FISH Assay

Published on: February 6, 2012

19.0K
Chromatin Immunoprecipitation in the Cnidarian Model System Exaiptasia diaphana
11:48

Chromatin Immunoprecipitation in the Cnidarian Model System Exaiptasia diaphana

Published on: March 17, 2023

536
Synthesis of Hypervalent Iodonium Alkynyl Triflates for the Application of Generating Cyanocarbenes
12:27

Synthesis of Hypervalent Iodonium Alkynyl Triflates for the Application of Generating Cyanocarbenes

Published on: September 8, 2013

11.0K

科学分野:

  • 遺伝学
  • 分子生物学
  • 細胞生物学

背景:

  • 染色体合成は,複雑な染色体の再編成を含む特定のタイプの染色体生成である.
  • その形成は,複製性ストレスによって引き起こされる欠陥DNA複製と関連しています.

研究 の 目的:

  • 染色体合成の背後にあるメカニズムの解明
  • 生まれつきの病気や癌における その役割を理解するためです

主な方法:

  • フォークストールとテンプレートスイッチング (FoSTeS) とマイクロホモロジー媒介によるブレイク誘発複製 (MMBIR) などの複製ベースのメカニズムを調査した.
  • DNA合成中のマイクロホモロジー依存のテンプレートとスイッチングイベントの形成を分析した.
  • 染色体の重複と三重化を観察した.

主要な成果:

  • 染色体合成を促す重要なメカニズムとしてFoSTeSとMMBIRを特定した.
  • これらのメカニズムは複合と三重によって特徴づけられる複雑な染色体の再編成のクラスターにつながることを示した.
  • クロモアシンセシスは,微核または染色体の橋渡しを介して,生殖線および初期の胚発達で発生する.

結論:

  • クロモアシンセシスは複製ストレスと特定のDNA修復経路による独特な現象である.
  • これは先天性疾患の病原化に作用し,がんでも観察されている.