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関連する概念動画

Water and Mineral Acquisition02:34

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Specialized tissues in plant roots have evolved to capture water, minerals, and some ions from the soil. Roots exhibit a variety of branching patterns that facilitate this process. The outermost root cells have specialized structures called root hairs that increase the root surface, thus increasing soil contact. Water can passively cross into roots, as the concentration of water in the soil is higher than that of the root tissue. Minerals, in contrast, are actively transported into root cells.
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The reaction between a Brønsted-Lowry acid and water is called acid ionization. For example, when hydrogen fluoride dissolves in water and ionizes, protons are transferred from hydrogen fluoride molecules to water molecules, yielding hydronium ions and fluoride ions:
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Skeletal muscle fibers have the unique ability to switch between rest and contraction states, using different sources of ATP for energy. The contraction cycle and Ca2+ transport back into the sarcoplasmic reticulum for relaxation require significant ATP. However, the ATP reserves in muscle fibers are limited and can only sustain contractions for a few seconds. Additional ATP production becomes necessary for prolonged contractions. As a result, muscle fibers generate ATP through various sources,...
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Muscle fatigue refers to the decline in a muscle's ability to maintain the force of contraction after prolonged activity. It primarily stems from changes within muscle fibers. Even before experiencing muscle fatigue, one may feel tired and have the urge to stop the activity. This response, known as central fatigue, occurs due to changes in the central nervous system, namely the brain and spinal cord. While there is no single mechanism that induces fatigue, it may serve as a protective...
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Gas solubility in liquids forms liquid-gas solutions, such as soft drinks, where carbon dioxide is dissolved in water, and the ocean, where the solubility of oxygen and carbon dioxide supports marine life. The ability of oceans to dissolve gases impacts weather conditions in the troposphere.However, gas-liquid interactions vary. For instance, hydrogen chloride gas is highly soluble in water, while oxygen's solubility is much lower. Because these solutions are non-ideal, Raoult’s law,...
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The hydration of cement is an exothermic reaction in which heat is generated as cement hydrates. This heat of hydration is critical to cement's strength development. The rate at which this heat is generated affects the temperature rise, with a majority of the heat being released early in the hydration process, half within the first three days, and about 75% within the first week.
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Printing Thermoresponsive Reverse Molds for the Creation of Patterned Two-component Hydrogels for 3D Cell Culture
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素早く自己強化するタフな水素ゲル

Chang Liu1, Naoya Morimoto1, Lan Jiang1

  • 1Material Innovation Research Center (MIRC) and Department of Advanced Materials Science, Graduate School of Frontier Sciences, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8561, Japan.

Science (New York, N.Y.)
|June 4, 2021
PubMed
まとめ

この研究は,ストレスを誘発した結晶化を用いた頑丈な水素ゲルの新しい無害な強化戦略を導入しています. この方法は,ポリエチレングリコール (PEG) ゲルの急速なエネルギー回復と優れた強度を達成し,従来の犠牲被害アプローチの限界を克服します.

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Synthesis of Strong Adhesive Hydrogel, Gelatin O-Nitrosobenzaldehyde
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科学分野:

  • 材料科学
  • ポリマー化学
  • バイオ材料工学

背景:

  • 頑丈な水素ガスは,しばしばエネルギー散布のために犠牲構造に依存しますが,周期的な負荷の間に不可逆的な損傷を受けます.
  • この損傷は,繰り返し使用した後にヒドロゲルの度が著しく低下し,実用的な用途を制限します.
  • 現存する強化戦略は,ダイナミックな条件下で迅速な回復とパフォーマンスの維持に苦労します.

研究 の 目的:

  • 破壊的ダメージの限界を 克服するヒドロゲルの 新しく無害な強化戦略を開発する
  • ハイドロゲルの硬さとエネルギー回収の強化のためのメカニズムとしてストレスの誘発結晶化の可能性を調査する.
  • この戦略を利用したスライドリングゲルの性能を周期的な負荷条件下で評価する.

主な方法:

  • 高度指向されたポリエチレングリコール (PEG) 鎖を備えたスライドリングゲルを使用した.
  • 大変な変形 (延長) を通して誘導されたストレス誘導結晶化.
  • 伸縮と収縮のサイクルで結晶構造の形成と融解を観察した.

主要な成果:

  • 拡張エネルギーのほぼ100%の迅速な回復を達成し,無害な強化メカニズムを示しました.
  • 立方メートルあたり6.6から22メガジュールまでの優れた強度を示した.
  • 耐久性は,従来のPEGゲルよりも1度高い.

結論:

  • ストレスを誘発した結晶化は,水素ガスを強化するための効果的な無害な戦略を提供します.
  • このアプローチは,水素ゲルの頑丈性を大幅に高め,従来の方法よりも速いエネルギー回復を可能にします.
  • 開発されたスライドリングゲルは,耐久性のある柔軟な材料を必要とするアプリケーションに大きな希望を示しています.