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関連する概念動画

Microtubule Instability02:17

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Microtubules are hollow cylindrical filaments having a diameter of approximately 25 nm and a length that varies from 200 nm to 25 μm. GTP-bound tubulin subunits form αβ-heterodimers for microtubule assembly. These core building blocks interact longitudinally, polymerizing into protofilaments. The protofilaments then interact with one another through lateral bonding forces to form stable cylindrical microtubules. These cylindrical filaments are dynamic as they undergo repeated...
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Rapid Amplification of cDNA Ends, or RACE, is one of the most effective methods to obtain a full-length cDNA from an mRNA sequence between a known internal region to the unknown sequence at the 5’ or 3’ end. The unknown region is cloned in the cDNA by a gene-specific primer that binds the known end, and a hybrid primer that attaches a predefined anchor sequence to the unknown end of the cDNA. The sequence in between is amplified by PCR with an anchor primer and a gene-specific...
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関連する実験動画

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Magnetically Induced Rotating Rayleigh-Taylor Instability
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種子のケール不安定による光増幅

G Vampa1,2, T J Hammond3, M Nesrallah3

  • 1Department of Physics, University of Ottawa, Ottawa, ON K1N 6N5, Canada. gvampa@stanford.edu thomas.brabec@uottawa.ca.

Science (New York, N.Y.)
|February 14, 2018
PubMed
まとめ
この要約は機械生成です。

研究者は,結晶の調節不安定を利用して,超短激光パルスの高得益増幅を達成しました. この方法は,より広範な調節性を提供し,従来のレーザー増幅技術の制限を回避します.

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科学分野:

  • 光学とフォトニクス
  • レーザー物理学
  • 材料科学

背景:

  • 伝統的なフェムト秒レーザー増幅方法は,パルス周波数と帯域幅に化学的特性またはモメンタム保存による制限を課すレーシングメディアまたは非線形結晶に依存しています.
  • 既存の技術はしばしば,増幅されたレーザー光の達成可能なチューナビリティとパルス特性を制限する.

研究 の 目的:

  • 超短時間のレーザーパルスの高強度増幅のための新しい方法を示すために.
  • 標準的な増幅技術の限界を克服する.
  • 高強度,幅広く調節可能,超短縮されたレーザーパルスを達成します.

主な方法:

  • イットリウムアルミニウムガーネット (Y3Al5O12) のシードモジュレーションの不安定性.
  • ポンプの源としてフェムト秒の赤外線パルスを使う
  • 60フェムト秒未満の長さのレーザーパルス増幅を達成する.

主要な成果:

  • 高強度増幅が証明されている (1000以上).
  • 0.5から2.2ミクロメートルの増幅パルスの広範囲のチューナビリティを達成しました.
  • 1平方センチメートルあたり 1テラワットまでの強度で 増幅されたパルスを生成します
  • 60フェムト秒未満のパルスを成功裏に増幅した.

結論:

  • 証明された方法は,ドーピングと相対応の制約を回避し,ガラスや結晶を含むより広い範囲の材料で増幅を可能にします.
  • この技術は,遠赤外線周波数でも,単周期パルスでも超短調のレーザーパルスを生成するのに適しています.
  • 増幅パルスは,固体と高興奮状態のガスの強いフィールドプロセスを調査するのに適しています.