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関連する概念動画

Types of Selection01:46

Types of Selection

Natural selection influences the frequencies of particular alleles and phenotypes within populations in several different ways. Primarily, natural selection can be directional, stabilizing, or disruptive. Directional selection favors one extreme trait and shifts the population towards that phenotype while selecting against individuals displaying alternate traits. Stabilizing selection favors an intermediate trait with a narrow range of variation. Deviation from the optimal phenotype towards an...
Dose-Response Relationship: Selectivity and Specificity01:25

Dose-Response Relationship: Selectivity and Specificity

Drugs exert their therapeutic effects by interacting with receptors, enzymes, or ion channels that are present throughout the human body. The strength and duration of the interaction between a drug and its target receptor are characterized by the selectivity and specificity of the drug. Selectivity refers to a drug's strong preference for its intended target over other targets. For instance, isoprenaline, a non-selective β-adrenergic agonist, interacts with both β1- and β2-adrenergic receptors...
Frequency-dependent Selection01:21

Frequency-dependent Selection

When the fitness of a trait is influenced by how common it is (i.e., its frequency) relative to different traits within a population, this is referred to as frequency-dependent selection. Frequency-dependent selection may occur between species or within a single species. This type of selection can either be positive—with more common phenotypes having higher fitness—or negative, with rarer phenotypes conferring increased fitness.Positive Frequency-Dependent SelectionIn positive...
Restriction Enzymes01:11

Restriction Enzymes

Restriction enzymes are bacterial enzymes used to cut DNA in a sequence-specific manner. To cleave DNA, they bind to specific palindromic sequences called restriction sites. Such palindromic DNA sequences or inverted repeats are commonly found in regions of functional significance, such as the origin of replication, gene operator sites, and regions containing transcription termination signals.
The host bacteria protect their own genomic DNA from these enzymes by methylating these sites. Some...
Induced-fit Model01:13

Induced-fit Model

Most chemical reactions in cells require enzymes—biological catalysts that speed up the reaction without being consumed or permanently changed. They reduce the activation energy needed to convert the reactants into products. Enzymes are proteins, that usually work by binding to a substrate—a reactant molecule that they act upon.
Enzymes exhibit substrate specificity, meaning that they can only bind to certain substrates. This is mainly determined by the shape and chemical characteristics of...
Epistasis Analysis01:09

Epistasis Analysis

Although Mendel chose seven unrelated traits in peas to study gene segregation, most traits involve multiple gene interactions that create a spectrum of phenotypes. When the interaction of various genes or alleles at different locations influences a phenotype, this is called epistasis. Epistasis often involves one gene masking or interfering with the expression of another (antagonistic epistasis). Epistasis often occurs when different genes are part of the same biochemical pathway. The...

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Updated: Jun 16, 2026

In Vitro Directed Evolution of a Restriction Endonuclease with More Stringent Specificity
09:16

In Vitro Directed Evolution of a Restriction Endonuclease with More Stringent Specificity

Published on: March 25, 2020

方向的な相互作用を用いた選択的ペアバイズエンカプスレーション.

Guzmán Gil-Ramírez1, Marcos Chas, Pablo Ballester

  • 1ICREA and Institute of Chemical Research of Catalonia (ICIQ), 43007 Tarragona, Spain.

Journal of the American Chemical Society
|February 6, 2010
PubMed
まとめ
この要約は機械生成です。

新しいテトラウレアアリル拡張カリックス[4]ピロロールカプセルは,トリメチラミンN酸化物とトリメチルフォスフィン酸化物をカプセル化するために自己組み立てられます. カプセルはカプセルです.

さらに関連する動画

Genome-wide Protein-protein Interaction Screening by Protein-fragment Complementation Assay (PCA) in Living Cells
08:38

Genome-wide Protein-protein Interaction Screening by Protein-fragment Complementation Assay (PCA) in Living Cells

Published on: March 3, 2015

A Yeast 2-Hybrid Screen in Batch to Compare Protein Interactions
14:23

A Yeast 2-Hybrid Screen in Batch to Compare Protein Interactions

Published on: June 6, 2018

関連する実験動画

Last Updated: Jun 16, 2026

In Vitro Directed Evolution of a Restriction Endonuclease with More Stringent Specificity
09:16

In Vitro Directed Evolution of a Restriction Endonuclease with More Stringent Specificity

Published on: March 25, 2020

Genome-wide Protein-protein Interaction Screening by Protein-fragment Complementation Assay (PCA) in Living Cells
08:38

Genome-wide Protein-protein Interaction Screening by Protein-fragment Complementation Assay (PCA) in Living Cells

Published on: March 3, 2015

A Yeast 2-Hybrid Screen in Batch to Compare Protein Interactions
14:23

A Yeast 2-Hybrid Screen in Batch to Compare Protein Interactions

Published on: June 6, 2018

科学分野:

  • 超分子化学 超分子化学
  • ホスト・ゲスト・ケミストリー
  • 有機化学 オーガニック・ケミストリー

背景:

  • カリックスピロールは,調節可能な穴を持つ多用途のマクロサイクリック宿主です.
  • ディメリックカプセルは,ユニークなカプセル化環境を提供します.
  • 主体分子内のゲスト指向を制御することは,重要な課題です.

研究 の 目的:

  • 二次性テトラウレアアリル延長カリックス[4]ピロロールカプセルを合成し,特徴づけるために.
  • トリメチラミンN酸化物とトリメチルフォスフィン酸化物のペアワイルエンカプスレーションを調査する.
  • ゲストの指向と選択性における極性機能群の役割を探求する.

主な方法:

  • テトラウレアアリル延長カリックス[4]ピロール前駆物の自己組み立て.
  • トリメチラミンN酸化物とトリメチルフォスフィン酸化物による封じ込め試験.
  • ゲストのインクルージョンと指向を決定するスペクトル解析 (NMR).

主要な成果:

  • 二次元カプセルの自己組み立ての成功が確認されました.
  • トリメチラミンN酸化物とトリメチルフォスフィン酸化物のペアバイエンカプスレーションが達成されました.
  • カプセル内部の極性機能群は,ゲストの指向に影響を与えました.
  • 適度な選択性が観察され,サイズや形だけに基づいたものではありません.

結論:

  • 二次カプセルは,極地客を効果的にカプセル化します.
  • 内部極のグループは,ゲストの指向を制御する役割を果たします.
  • 封じ込めの選択性は,ステリック障害を超えた要因に影響されます.