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関連する概念動画

The Sulfur Cycle01:22

The Sulfur Cycle

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Sulfur, an important element in the chemical makeup of proteins, is recycled through the atmosphere and aquatic and terrestrial environments. Found in the atmosphere as sulfur dioxide (SO2), sulfur is released by decaying organisms, weathered rocks, geothermal vents, volcanos, and burning fossil fuels. It is deposited into the ecosystem, cycled through the biotic community, and either released back into the atmosphere as gas or deposited in marine sediment for long-term storage and eventual...
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Vesicular Tubular Clusters01:45

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After budding out from the ER membrane, some COPII vesicles lose their coat and fuse with one another to form larger vesicles and interconnected tubules called vesicular tubular clusters or VTCs. These clusters constitute a compartment at the ER-Golgi interface known as ERGIC (Endoplasmic Reticulum Golgi Intermediate Compartment). The ERGIC is a mobile membrane-bound cargo transport system that sorts proteins secreted from ER and delivers them to the Golgi.
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Sulfur Assimilation01:20

Sulfur Assimilation

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Sulfur is an essential element in biological systems, contributing to synthesizing key biomolecules, including amino acids such as cysteine and methionine, and cofactors such as coenzyme A and biotin. Microorganisms primarily assimilate sulfur as sulfate (SO₄²⁻) from the environment, which must undergo a series of biochemical transformations before it can be incorporated into cellular components. As sulfate is highly oxidized, it must undergo assimilatory sulfate reduction to...
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Microbial Mats01:25

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Microbial communities forming biofilms and mats represent complex, spatially structured ecosystems where metabolic processes are stratified according to light, oxygen, and nutrient gradients. Biofilms are initial colonization stages, only a few millimeters thick, while mature microbial mats can reach centimeter-scale thickness and display intricate vertical organization. Their structural and functional heterogeneity allows microorganisms to occupy distinct ecological niches within a few...
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Microbes and the Sulfur Cycle01:29

Microbes and the Sulfur Cycle

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Sulfur is a vital element in Earth's biogeochemical systems. It transitions through various inorganic states, including sulfate (SO₄²⁻), elemental sulfur (S⁰), and sulfide (S²⁻). Abiotic and biological mechanisms across oxic and anoxic environments intricately mediate these transformations. Sulfate, the most oxidized form of sulfur, is predominantly stored in rocks, marine sediments, and oceanic waters, acting as a long-term reservoir in the global sulfur...
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Microbial activity plays a pivotal role in the biogeochemical cycling of iron and manganese, especially at the redox gradients characteristic of stratified aquatic environments. These cycles are driven by microbial transformations between oxidized and reduced forms of the metals, allowing organisms to exploit them for metabolic energy and structural purposes.Iron Cycling Across Redox GradientsIn neutral, oxygen-rich surface waters, iron is predominantly found in its oxidized, insoluble ferric...
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Multimodal Optical Microscopy Methods Reveal Polyp Tissue Morphology and Structure in Caribbean Reef Building Corals
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火山性メソサイクロンとは

Pinaki Chakraborty1, Gustavo Gioia, Susan W Kieffer

  • 1Department of Geology, University of Illinois, Urbana, Illinois 61801, USA. chakrabo@illinois.edu

Nature
|March 28, 2009
PubMed
まとめ
この要約は機械生成です。

火山のメソサイクロンは,回転する上流で,強い火山の羽根が対称性を失い,明確な傘の形を形成します. この現象は,噴火で観測される水漏れ,塵の悪魔,雷の覆いを説明する.

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科学分野:

  • * 火山学について
  • * 大気科学 (大気科学)
  • * 流体ダイナミクス

背景:

  • *火山の噴火の古典的なモデルは,軸対称性を仮定し,回転を想定しない.
  • * 強い火山の羽根は,垂直の柱と水平の傘で構成されています.
  • *以前のモデルは,羽根の動態における回転効果を考慮していなかった.

研究 の 目的:

  • * 強い火山の噴火に伴う上流の水力動力学的効果を調査する.
  • *"火山性メソサイクロン"の概念を紹介し,説明する.
  • *火山の噴火で観測された様々な現象の説明を統一する.

主な方法:

  • * 1991年のピナトゥボ山噴火の衛星画像の分析.
  • * 流体力学の原理を羽根の行動に適用する.
  • * モデル予測と複数の噴火からの観測データとの比較.

主要な成果:

  • * 羽根の上昇気流によって誘発された"火山性メソサイクロン"を特定しました.
  • *ピナトゥボ山からの衛星データを用いてプラームの回転が確認された.
  • * 複数の噴火で軸対称性および lobate 傘の形状の喪失が観察されました.
  • *メソサイクロンは,水漏れ,塵の悪魔,雷の殻の形成と関連付けられています.

結論:

  • * 火山性メソサイクロンは,強い火山の羽根動態の重要な要因です.
  • *このコンセプトは,以前は異なった羽根現象の説明を統一します.
  • * 回転により,羽根構造と関連する危険性が大きく変化します.