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関連する概念動画

Complement System01:27

Complement System

10.9K
The complement system is a group of approximately 20 plasma proteins that strengthen the body's defenses against infections through opsonization, inflammation, and cell lysis. Opsonization involves coating pathogens with complement proteins, making them more recognizable and facilitating phagocyte engulfment. Certain complement proteins induce inflammation that attracts immune cells to the site of infection. Cell lysis involves the destruction of pathogens through the formation of a...
10.9K
Complementation Tests00:49

Complementation Tests

6.3K
A complementation test is a simple cross to identify whether the two mutations are located on the same gene or different genes. It was first performed by Edward Lewis in the 1940s while working on fruit flies. He developed the test to identify the location and arrangement of different mutations on chromosomes.
Organisms heterozygous for different mutations are crossed pairwise in all combinations. If present on different genes, the mutations can complement each other by providing the missing...
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Primary Active Transport01:47

Primary Active Transport

200.9K
In contrast to passive transport, active transport involves a substance being moved through membranes in a direction against its concentration or electrochemical gradient. There are two types of active transport: primary active transport and secondary active transport. Primary active transport utilizes chemical energy from ATP to drive protein pumps that are embedded in the cell membrane. With energy from ATP, the pumps transport ions against their electrochemical gradients—a direction...
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Primary Active Transport01:29

Primary Active Transport

14.5K
In contrast to passive transport, active transport involves a substance being moved through membranes in a direction against its concentration or electrochemical gradient. There are two types of active transport: primary active transport and secondary active transport. Primary active transport utilizes chemical energy from ATP to drive protein pumps embedded in the cell membrane. With energy from ATP, the pumps transport ions against their electrochemical gradients—a direction they would...
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Primary and Secondary Growth in Roots and Shoots03:02

Primary and Secondary Growth in Roots and Shoots

60.7K
Vascular plants, which account for over 90% of the Earth’s vegetation, all undergo primary growth—which lengthens roots and shoots. Many land plants, notably woody plants, also undergo secondary growth—which thickens roots and shoots.
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Primary Production01:06

Primary Production

25.5K
The total amount of energy acquired by primary producers in an ecosystem is called gross primary production (GPP). However, of this energy, producers use some for metabolic processes, and some is lost as heat, decreasing the amount of energy available to the next trophic level. The remaining usable amount of energy is called the net primary productivity (NPP). In terrestrial ecosystems, NPP is driven by climate, while light penetration and nutrient availability drive NPP in aquatic ecosystems.
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Updated: Feb 13, 2026

Discovery of New Intracellular Pathogens by Amoebal Coculture and Amoebal Enrichment Approaches
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補足C2欠乏によって引き起こされる一次性アメビック性髄膜大脳炎.

Jian Cui, Colleen M Roark, Nerea Domínguez-Pinilla

    medRxiv : the preprint server for health sciences
    |February 12, 2026
    PubMed
    まとめ
    この要約は機械生成です。

    プライマリ・アメーブ性髄膜大脳炎 (PAM) は,希少で致死性の感染症です. この研究では,補完成分2 (C2) の欠乏が感受性を引き起こすことが判明し,Naegleria fowleriとの闘いにおける補完システムの役割を強調しました.

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    Discovery of New Intracellular Pathogens by Amoebal Coculture and Amoebal Enrichment Approaches
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    Depletion of Specific Cell Populations by Complement Depletion
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    科学分野:

    • 免疫学 免疫学とは
    • 遺伝学 遺伝学とは
    • 感染症 感染症は感染症です.

    背景:

    • 原発性アメーブ性髄膜大脳炎 (PAM) は,ネグレリア・フォウレリ菌 (Naegleria fowleri) によって引き起こされる重度の中枢神経系感染症です.
    • ホストの脆弱性は,単なる暴露ではなく,PAMの開発に不可欠です.
    • N. fowleriに対する保護と感受性の免疫メカニズムは十分に理解されていません.

    研究 の 目的:

    • 珍しいPAMの生存者の免疫および遺伝的要因を調査する.
    • Naegleria fowleriの感受性に寄与する宿主脆弱性を特定する.
    • N. fowleri.との闘いにおけるコンプリメント・システムの役割を明らかにする.

    主な方法:

    • PAMの生存者の包括的な臨床,免疫,遺伝分析.
    • 高次元免疫プロファイリング (CyTOF) と全エクソームシーケンシング (WES).
    • 血清媒介のアメビシダ活性に対するインビトロ機能アッセイ.

    主要な成果:

    • コンプリメントコンポーネント2 (C2) 遺伝子のホモジゴス・デレーションを持つPAM生存者が特定されました.
    • C2欠乏は,古典的な補足経路の活性と膜攻撃複合体 (MAC) の堆積を廃止しました.
    • 患者の血清にはN. fowleriのアメビシダ活性が欠けていたが,浄化されたC2. 2を加えることで回復した.

    結論:

    • PAMは,免疫の単一性先天性エラー (IEI) から生じる可能性があります.
    • 補完系は,Naegleria fowleriに対する人間の防御に極めて重要です.
    • C2欠乏症は,原発性アメーブ性髄膜大脳炎の新たな感受性因子である.