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The Evidence for Evolution02:55

The Evidence for Evolution

48.0K
Genetic variations accumulating within populations over generations give rise to biological evolution. Evolutionary changes can result in the formation of novel varieties and entire new species. These changes are responsible for the diverse forms of life inhabiting the planet. The evidence for evolution suggests that all living organisms descended from common ancestors.
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Convergent Evolution01:54

Convergent Evolution

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Evolution shapes the features of organisms over time, ensuring that they are suited for the environments in which they live. Sometimes, selection pressure leads to the rise of similar but unrelated adaptations in organisms with no recent common ancestors, a process known as convergent evolution.
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Electrostatic Boundary Conditions01:16

Electrostatic Boundary Conditions

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Consider an external electric field propagating through a homogeneous medium. When the electric field crosses the surface boundary of the medium, it undergoes a discontinuity. The electric field can be resolved into normal and tangential components. The amount by which the field changes at any boundary is given by the difference between the field components above and below the surface boundary.
The surface integral of an electric field is given by Gauss's law in integral form and is related to...
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Eukaryotic Evolution01:24

Eukaryotic Evolution

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The endosymbiont theory is the most widely accepted theory of eukaryotic evolution; however, its progression is still somewhat debated. According to the nucleus-first hypothesis, the ancestral prokaryote first evolved a membrane to enclose DNA and form the nucleus. Conversely, the mitochondria-first hypothesis suggests that the nucleus was formed after endosymbiosis of mitochondria.
Contrary to the endosymbiont theory, the eukaryote-first hypothesis proposes that the simpler prokaryotic and...
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Synteny and Evolution02:31

Synteny and Evolution

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John H. Renwick first coined the term “synteny” in 1971, which refers to the genes present on the same chromosomes, even if they are not genetically linked. The species with common ancestry tend to show conserved syntenic regions. Therefore, the concept of synteny is nowadays used to describe the evolutionary relationship between species.
Around 80 million years ago, the human and mice lineages diverged from the common ancestor. During the course of evolution, the ancestral...
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Electrostatic Boundary Conditions in Dielectrics01:27

Electrostatic Boundary Conditions in Dielectrics

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When an electric field passes from one homogeneous medium to another, crossing the boundary between the two mediums imparts a discontinuity in the electric field. This results in electrostatic boundary conditions that depend on the type of mediums the field propagates through.
Consider a case where both the mediums across a boundary are two different dielectric materials. Recall that the electric field and electric displacement are proportional and related through the material's permittivity....
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Evolution of Staircase Structures in Diffusive Convection
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光誘起静電ナノ集合体の構造進化

Mohit Agarwal1,2, Ralf Schweins2, Franziska Gröhn1

  • 1Department of Chemistry and Pharmacy, Interdisciplinary Center for Molecular Materials, Friedrich-Alexander Universität Erlangen-Nürnberg, Egerlandstr. 3, D-91058 Erlangen, Germany.

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まとめ
この要約は機械生成です。

研究者らは、光応答性色素とデンドリマーを使用して、ナノスケールの自己集合をリアルタイムで制御しました。この光異性化駆動法により、調整可能な構造が可能になり、適応性材料およびドラッグデリバリーシステムの進歩につながります。

キーワード:
静電自己集合in situ SANS速度論ナノ粒子形態進化球形から楕円形への遷移

さらに関連する動画

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Light-induced Patterning and Grafting for Slippery Surfaces based on Silane-coated Nanoporous Structures
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科学分野:

  • 材料科学
  • ナノテクノロジー
  • 光化学

背景:

  • 外部刺激下でのナノスケール自己集合のリアルタイムモニタリングは、動的材料の開発にとって重要です。
  • 静電自己集合は知られていますが、光照射下でのリアルタイム研究は十分に探求されていません。

研究 の 目的:

  • 光応答性アゾベンゼン色素（AY38）およびポリアミド（PAMAM）デンドリマーによって駆動される静電自己集合の速度論および形態進化を調査すること。
  • 光異性化を自己集合速度論およびナノスケールアーキテクチャを制御するメカニズムとして確立すること。

主な方法:

  • 形態学的変換のリアルタイム追跡のためにカスタムのin situ小角中性子散乱（SANS）セットアップを利用しました。
  • 光応答性アゾベンゼン色素（AY38）およびpH感受性PAMAMデンドリマーを使用しました。
  • 2つの異なる集合経路を調査しました：事前に照射されたシス-AY38（遅い速度論）および直接UV誘起集合（速い速度論）。

主要な成果:

  • トランス-シス異性化速度論が自己集合速度、凝集体安定性、およびゼータ電位に直接影響することを実証しました。
  • 球形から楕円形の構造への形態遷移を観察しました。
  • 静電相互作用および双極子-双極子相互作用と構造変化を相関させました。

結論:

  • 光異性化駆動自己集合は、調整可能なナノスケールアーキテクチャを作成するための堅牢な方法を提供します。
  • このアプローチは、適応性フォトニック材料、標的ドラッグデリバリー、および再構成可能なナノ構造のアプリケーションに有望です。