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関連する概念動画

Global Regulatory Systems01:28

Global Regulatory Systems

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Global regulatory systems in bacteria enable rapid and coordinated responses to environmental changes by integrating sensory inputs with gene expression, ensuring efficient adaptation to fluctuating conditions. Key global regulatory mechanisms include regulons, two-component systems, sigma factors, and secondary messengers.Regulons and Global RegulatorsA regulon is a collection of genes and operons controlled by a common global regulator. These regulators enable bacteria to prioritize resource...
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Once a ligand binds to a receptor, the signal is transmitted through the membrane and into the cytoplasm. The continuation of a signal in this manner is called signal transduction. Signal transduction only occurs with cell-surface receptors, which cannot interact with most components of the cell, such as DNA. Only internal receptors can interact directly with DNA in the nucleus to initiate protein synthesis. When a ligand binds to its receptor, conformational changes occur that affect the...
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Rab GTPases act in a regulated cascade during membrane fusion, helping the lipid bilayers mix. The Rab family of proteins are active when bound to GTP, and inactive when bound to GDP. Hence, they act as guanine nucleotide-dependent molecular switches. Rab-GTP recognizes and binds to long or short-range tethering proteins to capture the target vesicle. These tethers coordinate with SNAREs on the vesicle and the target membrane to assemble the trans SNARE complex that locks the mixing bilayers.
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Throughout its ~4.5 billion year history, the Earth has experienced periods of warming and cooling. However, the current drastic increase in global temperatures is well outside of the Earth’s cyclic norms, and evidence for human-caused global climate change is compelling. Paleoclimatology, the study of ancient climate conditions, provides ample evidence for human-caused global climate change by comparing recent conditions with those in the past.
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Operational amplifiers (op-amps) are versatile electronic components that can be interconnected in a cascade - one after another in a linear sequence. This cascading is possible due to their infinite input resistance and zero output resistance, allowing them to maintain their input-output relationships even when connected in series.
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Mitogen-activated protein kinase, or MAPK pathway, activates three sequential kinases to regulate cellular responses such as proliferation, differentiation, survival, and apoptosis. The canonical MAPK pathway starts with a mitogen or growth factor binding to an RTK. The activated RTKs stimulate Ras, which recruits Raf or MAP3 Kinase (MAPKKK), the first kinase of the MAPK signaling cascade. Raf further phosphorylates and activates MEK or MAP2 Kinases (MAPKK), which in turn phosphorylates MAP...
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Updated: Jan 23, 2026

Measuring Near Plasma Membrane and Global Intracellular Calcium Dynamics in Astrocytes
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グローバルコバルトサプライチェーンにおけるシステムリスクとカスケードダイナミクス

Xin Ouyang1,2,3, Litao Liu1,2, Qiance Liu3

  • 1Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing, 100101, China.

Environmental science and ecotechnology
|January 22, 2026
PubMed
まとめ

地政学的な緊張により、グローバルなコバルトサプライチェーンはリスクの増大に直面しています。新しい研究により、システム的な脆弱性とカスケード障害が明らかになり、低炭素技術への移行を確実にするための国際協力の必要性が強調されています。

キーワード:
コバルト物質フロー解析多層ネットワークショック伝播サプライチェーン

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科学分野:

  • 地球・環境科学
  • 経済学
  • システム工学

背景:

  • コバルトのような重要鉱物は、低炭素技術への世界的な移行に不可欠です。
  • 相互接続されたサプライチェーンは、地政学的な緊張や混乱の影響を受けやすいです。
  • 現在のリスク評価では、商品間の依存関係を無視して、個別の商品を孤立させることがよくあります。

研究 の 目的:

  • 1998年から2019年までの世界のコバルトの流れにおけるシステムリスクを分析すること。
  • コバルトサプライチェーンにおける混乱の脆弱性と伝播経路を特定すること。
  • サプライチェーンのショックに対する国家の回復力を評価すること。

主な方法:

  • 貿易連動型物質フロー解析と多層ショック伝播モデルを統合しました。
  • 230の国と地域にわたる世界のコバルトの流れを分析しました。
  • 水平-垂直および直接-間接経路を通じた混乱の伝播をモデル化しました。

主要な成果:

  • 混乱は複雑な経路を通じて伝播し、リスクは採掘で集中しますが、精製-製造で蓄積します。
  • カスケード障害は、物理的なサプライチェーンよりも4倍密度の高い「雪崩ネットワーク」を作成します。
  • 脆弱性が低くても露出度が高い国(例:インドネシア、南アフリカ、メキシコ)は非常に脆弱です。

結論:

  • コバルトサプライチェーンにおける世界のシステムリスクは、20年間で不安定な上昇傾向を示しています。
  • 国家の緩和戦略は不十分であり、システムレベルの調整が不可欠です。
  • サプライチェーンの回復力を達成するには、段階を意識した多国間協力が必要です。