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関連する概念動画

Masking and Demasking Agents01:19

Masking and Demasking Agents

EDTA titrations may necessitate masking and demasking agents to temporarily protect a particular metal ion in a mixture from the EDTA reaction. These agents facilitate the sequential analysis of the metal ions by forming stable complexes with some—but not all—metal ions during certain steps.
There are many masking agents, such as cyanide, fluoride, triethanolamine, thiourea, and 2,3-bis(sulfanyl)propan-1-ol (formerly 2,3-dimercapto-1-propanol), with the masking agent chosen based on the metal...
Surface Active Agents01:27

Surface Active Agents

Surfactants, named for their behavior at interfaces, positively adsorb at the interfaces of two phases, reducing interfacial tension. Their versatility as emulsifiers, detergents, and foaming agents stems from this ability. Surfactants, often termed amphiphiles, share the property of amphipathy, with molecules having both hydrophilic and hydrophobic portions. The hydrophilic part is called the head, and the hydrophobic part, including an elongated alkyl substituent, forms the tail.Surfactants...
Rab Cascades01:25

Rab Cascades

Rab GTPases act in a regulated cascade during membrane fusion, helping the lipid bilayers mix. The Rab family of proteins are active when bound to GTP, and inactive when bound to GDP. Hence, they act as guanine nucleotide-dependent molecular switches. Rab-GTP recognizes and binds to long or short-range tethering proteins to capture the target vesicle. These tethers coordinate with SNAREs on the vesicle and the target membrane to assemble the trans SNARE complex that locks the mixing bilayers.
Buoyancy and Stability for Submerged and Floating Bodies01:11

Buoyancy and Stability for Submerged and Floating Bodies

In fluid mechanics, buoyancy and stability are key concepts for understanding the behavior of submerged and floating bodies. When a stationary body is fully or partially submerged in a fluid, the fluid exerts a force on the body known as the buoyant force. This force acts vertically upward through a point called the center of buoyancy, which is the center of the displaced fluid volume. According to Archimedes' principle, the magnitude of the buoyant force is equal to the weight of the fluid...
Rab Proteins01:14

Rab Proteins

Rab proteins constitute the largest family of monomeric GTPases, of which 70 members are present in humans. Rab proteins and their effectors regulate consecutive stages of vesicle transport such as vesicle transport, docking, and fusion to the correct recipient membrane.
Rab proteins switch between a cytosolic, GDP-bound inactive state and a membrane-anchored, GTP-bound active state. By themselves, Rabs show slow rates of GDP/GTP exchange and GTP hydrolysis. Thus, Rab proteins are considered...
Radial System Protection01:23

Radial System Protection

Radial systems employ time-delay overcurrent relays to reduce load interruptions. When a fault occurs, the nearest breaker opens first, while upstream breakers remain closed due to longer delay settings. This approach ensures minimal disruption to the rest of the system.
In a radial system with a fault downstream of the third breaker, ideally, only the third breaker will open, isolating the fault and interrupting the load connected beyond it. The second breaker has a longer delay setting,...

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関連する実験動画

Updated: Jun 23, 2026

Isolation of Adeno-Associated Viral Vectors Through a Single-Step and Semi-Automated Heparin Affinity Chromatography Protocol
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Isolation of Adeno-Associated Viral Vectors Through a Single-Step and Semi-Automated Heparin Affinity Chromatography Protocol

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ユニバーサル (切り替え可能) のRAFTエージェント

Massimo Benaglia1, John Chiefari, Yen K Chong

  • 1CSIRO Molecular and Health Technologies, Bag 10, Clayton South, Victoria 3169, Australia.

Journal of the American Chemical Society
|May 1, 2009
PubMed
まとめ

研究者らは,制御されたラジカルポリメリゼーションのための新しい切り替え可能なRAFT剤を開発しました. これらの薬剤は,活性化量が低いモノマーと活性化量が高いモノマーの両方を効果的にポリマー化し,制御された分子量を持つブロックコポリマーの合成を可能にします.

科学分野:

  • ポリマー化学のポリマー化学について
  • マテリアルサイエンス 材料科学

背景:

  • リバーシブル・アディション・フラグメンテーション・チェーン・トランスファー (RAFT) は,制御された根性ポリメリゼーション技術です.
  • 特定のモノマー (より活性化対より活性化) に対して適切なRAFT剤の選択は,成功するポリメリゼーション制御に不可欠です.
  • 既存のRAFT剤は,しばしば選択性を示し,特定のモノメアタイプを抑制または制御することができない.

研究 の 目的:

  • 新しい種類の"交換可能な"RAFTエージェントを導入する.
  • 低活性化モノマー (LAM) と高活性化モノマー (MAM) のポリメリゼーションを制御する効果を実証する.
  • 制御された分子量を持つブロックコポリマーの合成を可能にします.

主な方法:

  • 交換可能なRAFT剤としてN-(4-ピリジニル) -N-メチルジチオカルバメトの合成.
  • これらのエージェントを使用して,LAM (例えば,ビニルアセテート) の制御された根性ポリメリゼーション.
  • RAFT剤をプロティック酸またはルイス酸で活性化する.
  • アクティベーション後のMAM (例えば,アクリラート) の制御された根性ポリメリゼーション.
  • ポリ・マム・ブロック・ポリ・ラム・コポリマーの合成.

さらに関連する動画

An Ecdysone Receptor-based Singular Gene Switch for Deliberate Expression of Transgene with Robustness, Reversibility, and Negligible Leakiness
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Facile and Efficient Preparation of Tri-component Fluorescent Glycopolymers via RAFT-controlled Polymerization
10:54

Facile and Efficient Preparation of Tri-component Fluorescent Glycopolymers via RAFT-controlled Polymerization

Published on: June 19, 2015

関連する実験動画

Last Updated: Jun 23, 2026

Isolation of Adeno-Associated Viral Vectors Through a Single-Step and Semi-Automated Heparin Affinity Chromatography Protocol
09:12

Isolation of Adeno-Associated Viral Vectors Through a Single-Step and Semi-Automated Heparin Affinity Chromatography Protocol

Published on: April 5, 2024

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06:21

An Ecdysone Receptor-based Singular Gene Switch for Deliberate Expression of Transgene with Robustness, Reversibility, and Negligible Leakiness

Published on: May 7, 2018

Facile and Efficient Preparation of Tri-component Fluorescent Glycopolymers via RAFT-controlled Polymerization
10:54

Facile and Efficient Preparation of Tri-component Fluorescent Glycopolymers via RAFT-controlled Polymerization

Published on: June 19, 2015

主要な成果:

  • 新しいRAFT剤は,LAMポリメリゼーションの優れた制御を提供します.
  • 酸の活性化は,MAMのポリメリゼーションを効果的に制御するために,エージェントを変換します.
  • スイッチアブル剤は,ブロックコポリマーの配列合成を可能にします.
  • その結果,ブロックコポリマーは狭い分子量分布を示します.

結論:

  • N-(4-ピリジニル) -N-メチルジチオカルバメトは,切り替え可能なRAFT剤の汎用性のあるクラスを表しています.
  • これらの薬剤は,伝統的なRAFT薬剤のモノマー特異的な制限を克服します.
  • ブロックコポリマーを含む複雑なポリマーアーキテクチャを高精度で合成するための強力なツールです.