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関連する概念動画

Newman Projections02:06

Newman Projections

Different notations are used to represent the three-dimensional structure of molecules on two-dimensional surfaces. One of the most commonly used representations is the dash-wedge formula. The dashed wedges, solid wedges, and the plane lines indicate the groups situated behind the plane, coming out of the plane, and in the plane, respectively.
The organic molecules rotate across the single bonds leading to numerous temporary three-dimensional structures of varying energy known as conformers.
Polymer Classification: Architecture01:14

Polymer Classification: Architecture

Polymers are classified as linear or branched on the basis of their chain architecture. The polymer chains in linear polymers have a long chain-like structure with minimal to no branching at all. Even if a polymer features large substituent groups on the monomer, which appear as branches to the skeleton, it is not considered a branched polymer. A branched polymer contains secondary polymer chains that arise from the main polymer chain. The branching occurs when the polymer growth shifts from...
Radical Chain-Growth Polymerization: Chain Branching01:17

Radical Chain-Growth Polymerization: Chain Branching

The skeletal structure of polymers synthesized via radical polymerization is always branched. For example, the polymerization of ethylene by radical polymerization results in a low-density grade of polyethylene with a heavily branched skeletal structure. Here, the radical site abstracts hydrogen from the growing chain, and the radical site shifts from the end (a primary carbon center) to anywhere within the growing chain (a secondary carbon center). Consequently, the part of the chain from the...
Anionic Chain-Growth Polymerization: Overview01:20

Anionic Chain-Growth Polymerization: Overview

The polymerization process that involves carbanion as an intermediate is called anionic polymerization. It is also a type of addition or chain-growth polymerization. Anionic polymerization gets initiated by a strong nucleophile such as an organolithium or a Grignard reagent. The most commonly used initiator for anionic polymerization is butyl lithium. Monomers involved in anionic polymerization must possess a vinyl group bonded to one or two electron-withdrawing groups. For instance,...
Anionic Chain-Growth Polymerization: Mechanism01:04

Anionic Chain-Growth Polymerization: Mechanism

The mechanism for anionic chain-growth polymerization involves initiation, propagation, and termination steps. In the initiation step, a nucleophilic anion, such as butyl lithium, initiates the polymerization process by attacking the π bond of the vinylic monomer. As a result, a carbanion, stabilized by the electron‐withdrawing group, is generated. The resulting carbanion acts as a Michael donor in the propagation step and attacks the second vinylic monomer, which acts as a Michael acceptor.
Types of Step-Growth Polymers: Polyesters01:20

Types of Step-Growth Polymers: Polyesters

The introduction of polyesters has brought major development to the textile industry. The wrinkle-free behavior of polyester blends has eliminated the need for starching and ironing clothes.
Polyesters are commonly prepared from terephthalic acid and ethylene glycol; the crude product is known as poly(ethylene terephthalate) or PET. However, polyesters are synthesized industrially by transesterification of dimethyl terephthalate with ethylene glycol at 150 °C. The two reactants and the polymer...

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関連する実験動画

Updated: Jul 11, 2026

Grafting Multiwalled Carbon Nanotubes with Polystyrene to Enable Self-Assembly and Anisotropic Patchiness
11:09

Grafting Multiwalled Carbon Nanotubes with Polystyrene to Enable Self-Assembly and Anisotropic Patchiness

Published on: April 1, 2018

ポリプロリンヘリックスに基づくペプチドデンドリマー.

Laia Crespo1, Glòria Sanclimens, Beatriz Montaner

  • 1Departament de Química Orgànica, Universitat de Barcelona, Martí i Franquès 1, 08028-Barcelona, Spain.

Journal of the American Chemical Society
|July 26, 2002
PubMed
まとめ

プロリンヘリクスを用いた新しいペプチドデンドリマーは,シプロフロクサシンによる細胞吸収と複合体の形成を示しています. これらの新しい分岐型ポリプロリンは,薬物投与およびバイオマテリアルアプリケーションの潜在能力を提供しています.

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Operation of the Collaborative Composite Manufacturing (CCM) System
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Operation of the Collaborative Composite Manufacturing (CCM) System

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Tree Core Analysis with X-ray Computed Tomography
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Tree Core Analysis with X-ray Computed Tomography

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関連する実験動画

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Grafting Multiwalled Carbon Nanotubes with Polystyrene to Enable Self-Assembly and Anisotropic Patchiness
11:09

Grafting Multiwalled Carbon Nanotubes with Polystyrene to Enable Self-Assembly and Anisotropic Patchiness

Published on: April 1, 2018

Operation of the Collaborative Composite Manufacturing (CCM) System
10:09

Operation of the Collaborative Composite Manufacturing (CCM) System

Published on: October 1, 2019

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科学分野:

  • バイオケミストリー バイオケミストリー
  • マテリアルサイエンス 材料科学
  • 薬用化学 薬用化学について

背景:

  • ペプチド dendrimersは,多様なアプリケーションを持つ複雑なマクロ分子です.
  • ポリプロリンヘリックス (PPIとPPII) は,ユニークな構造特性を有しています.
  • dendritic 構造の制御された合成は,機能的な材料にとって非常に重要です.

研究 の 目的:

  • ペプチドデンドリマーの新しい家族を合成し,特徴づけること.
  • これらの dendrimersの構成的行動を調査するために.
  • 細胞内化と薬物複合性の特性を評価する.

主な方法:

  • 収束固相ペプチド合成.
  • 形状分析のための円形の二重化スペクトロスコーピー.
  • ネズミの腎臓細胞を用いた細胞吸収研究.
  • プロパノール中のシプロフロクサシンによる合併症に関する研究.

主要な成果:

  • ポリプロリンとシス-4-アミノ-L-プロリンに基づくペプチドデンドリマーの成功合成.
  • 枝分かれしたポリプロリンにおける形状転換 (PPI から PPII) の観察.
  • 腎臓細胞による線形ポリプロリンとデンドリットポリプロリンの両方の活性内化が実証されています.
  • 枝分かれしたポリプロリン鎖を持つシプロフロクサシン複合体の形成に関する予備的な証拠.

結論:

  • 新型ペプチドデンドリマーは,興味深い構造特性と細胞吸収を示しています.
  • 枝分かれしたポリプロリン構造は,抗生物質のような小さな分子と相互作用する可能性を示しています.
  • これらの発見は,薬物投与システムやバイオマテリアルにおける潜在的な応用を示唆しています.