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関連する概念動画

Clot Retraction and Fibrinolysis01:16

Clot Retraction and Fibrinolysis

After a fibrin clot is formed, the next step is clot retraction, a vital process facilitated by platelet contractile proteins, such as actin and myosin. These proteins pull the fibrin strands closer together and condense the clot. This action reduces the size of the clot, creating a smaller, denser structure that effectively seals off the damaged vessel. Clot retraction consolidates the clot and helps with wound healing by bringing the edges of the damaged blood vessel closer together.
Alterations in Respiration II01:30

Alterations in Respiration II

There are numerous types of normal and abnormal respiration. Based on ventilatory movements, breathing patterns are classified as regular, deep, or shallow. Examples include Biot's breathing, Cheyne-Stokes respiration, Kussmaul's breathing, hyperventilation, and hypoventilation. Each pattern is clinically significant and aids in evaluating patients.
In Biot's breathing, the respiratory rate and depth are irregular, alternating between periods of deep gasping and apnea. Common causes include...
Repressible Operon: trp Operon01:21

Repressible Operon: trp Operon

The trp operon in Escherichia coli exemplifies a repressible operon. It regulates the synthesis of tryptophan through repressor-mediated transcriptional control and attenuation. This dual regulatory mechanism ensures tryptophan biosynthesis occurs only when needed, conserving cellular resources.Structure of the trp OperonThe trp operon consists of five structural genes (trpE, trpD, trpC, trpB, and trpA) that encode enzymes for tryptophan biosynthesis. These genes are transcribed as a single...
Proofreading01:43

Proofreading

Synthesis of new DNA molecules starts when DNA polymerase links nucleotides together in a sequence that is complementary to the template DNA strand. DNA polymerase has a higher affinity for the correct base to ensure fidelity in DNA replication. The DNA polymerase furthermore proofreads during replication, using an exonuclease domain that cuts off incorrect nucleotides from the nascent DNA strand.Errors during Replication Are Corrected by the DNA Polymerase EnzymeGenomic DNA is synthesized in...
Proofreading01:43

Proofreading

Synthesis of new DNA molecules starts when DNA polymerase links nucleotides together in a sequence that is complementary to the template DNA strand. DNA polymerase has a higher affinity for the correct base to ensure fidelity in DNA replication. The DNA polymerase furthermore proofreads during replication, using an exonuclease domain that cuts off incorrect nucleotides from the nascent DNA strand.Errors during Replication Are Corrected by the DNA Polymerase EnzymeGenomic DNA is synthesized in...
Proofreading01:31

Proofreading

Synthesis of new DNA molecules is carried out by the enzyme DNA polymerase, which adds nucleotides on the daughter strand complementary to the template DNA strand. DNA polymerase has a higher affinity to add the correct base and ensures fidelity during DNA replication. Furthermore,  it exhibits proofreading activity during replication, using an exonuclease domain that cuts off incorrect nucleotides from the nascent DNA strand.
Errors During Replication are Corrected by the DNA Polymerase Enzyme

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関連する実験動画

Updated: Jul 12, 2026

Transcorporal Artificial Urinary Sphincter Cuff Placement in a Case Requiring Revision for Urethral Atrophy
03:25

Transcorporal Artificial Urinary Sphincter Cuff Placement in a Case Requiring Revision for Urethral Atrophy

Published on: June 16, 2022

Erratum Erratum エラトゥーム エラトゥーム

    Science (New York, N.Y.)
    |February 6, 1959
    PubMed
    まとめ

    1958年の研究で,赤血球の酵素活性レベルは1000の因数で誤報されました. 訂正された酵素活性は,10^6.6ではなく,10^9の赤血球ごとに報告されるべきです.

    科学分野:

    • バイオケミストリー バイオケミストリー
    • 血液学 ヘマトロジ
    • 酵素学 酵素学とは

    背景:

    • 以前の研究では,赤血球に対する酵素活性レベルが報告されていた.
    • 研究された酵素は,グルコース-6-リン酸脱水酸化酵素,6-フォスフォグルコン酸脱水酸化酵素,および核酸リン酸塩酵素でした.
    • 元の報告書は1958年にサイエンス誌に掲載された.

    研究 の 目的:

    • 報告された酵素活性レベルにおける重大な誤りを修正するために.
    • 将来の研究と赤血球代謝の理解のために正確なデータを提供します.

    主な方法:

    • 元の報告書の表1に示されたデータの再評価.
    • 酵素活性の測定単位で一貫した誤差を特定する.

    主要な成果:

    • 酵素活性レベルが10^3.3の因数で誤っていることが判明しました.
    • すべての報告された活動レベルは,この因子によって調整されるべきです.

    結論:

    • 訂正された酵素活性レベルは10^9の赤血球あたりです.
    • 酵素活性に関する正確な報告は,科学的再現性と解釈に不可欠です.

    関連する実験動画

    Last Updated: Jul 12, 2026

    Transcorporal Artificial Urinary Sphincter Cuff Placement in a Case Requiring Revision for Urethral Atrophy
    03:25

    Transcorporal Artificial Urinary Sphincter Cuff Placement in a Case Requiring Revision for Urethral Atrophy

    Published on: June 16, 2022