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関連する概念動画

Ecological Disturbance02:26

Ecological Disturbance

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An ecological disturbance is a temporary disruption in the environment resulting from abiotic, biotic, or anthropogenic factors, causing a pronounced change in an ecosystem. The impact of an ecological disturbance, which can depend on its intensity, frequency, and spatial distribution, plays a significant role in shaping the species diversity within the ecosystem.
21.1K
Ecological Niches02:02

Ecological Niches

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All organisms have a position within an ecosystem. The complete set of living and nonliving factors—including food resources, climate, and terrain—that define the position of a given organism are collectively referred to as the organism’s ecological niche.
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The Soil Ecosystem02:23

The Soil Ecosystem

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Plants obtain inorganic minerals and water from the soil, which acts as a natural medium for land plants. The composition and quality of soil depend not only on the chemical constituents but also on the presence of living organisms. In general, soils contain three major components:
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What is an Ecosystem?01:17

What is an Ecosystem?

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Overview
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Ecological Succession02:17

Ecological Succession

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Ecological succession is influenced by the processes of facilitation, inhibition, and toleration. Facilitation occurs when early successional species create more favorable ecological conditions for subsequent species, such as enhanced nutrient, water, or light availability. In contrast, inhibition happens when early successional species create unfavorable ecological conditions for potential successive species, such as limiting resource availability. In some cases, later successional species...
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Replication in Eukaryotes02:31

Replication in Eukaryotes

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Overview
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Environmental insights from high-resolution (SIMS) sulfur isotope analyses of sulfides in Proterozoic microbialites with diverse mat textures.

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関連する実験動画

Updated: Jan 31, 2026

Ecosystem Fabrication EcoFAB Protocols for The Construction of Laboratory Ecosystems Designed to Study Plant-microbe Interactions
11:57

Ecosystem Fabrication EcoFAB Protocols for The Construction of Laboratory Ecosystems Designed to Study Plant-microbe Interactions

Published on: April 10, 2018

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初期の真核生物の生態系における形態学的および生態学的複雑さ

E J Javaux1, A H Knoll, M R Walter

  • 1Botanical Museum, Harvard University, Cambridge, Massachusetts 02138, USA.

Nature
|July 14, 2001
PubMed
まとめ

初期のエウカリオットは,これまで考えられていたよりもずっと早く多様化しました. 15億年前の化石は,複雑な微生物を明らかにし,真核生物の進化のための確立された細胞骨格と生態学的基盤を示しています.

科学分野:

  • 地質学 地質学 地質学
  • パレオントロジー・パレオントロジー
  • バイオケミストリー バイオケミストリー

背景:

  • ユカリオットの進化と多様化は,地球上の初期の生命を理解するための鍵です.
  • 以前の真核生物多様化の証拠は,主に若い地質学期に限られていた.

研究 の 目的:

  • ユカリオットの初期の進化史と多様化を調査する.
  • 化石の証拠を用いて,重要な真核生物の進化的出来事の年齢を決定する.

主な方法:

  • 小型サブユニットリボソームRNA遺伝子を用いた分子フィロゲニー.
  • ステランと炭素同位体の枯渇のための古代ケロゲン (270億年前の) の生地化学分析.
  • 初期のメソプロテロゾイク時代のシェールの微化石分析 (ローパーグループ,オーストラリア).

主要な成果:

  • 分子データは,ユカリアとアルカイアの間の深い分岐を示唆しています.
  • 古代のケロゲンにおける生地化学的シグネチャー (ステラネス,13Cの減少) は,これらの領域間の初期の分裂を示しています.
  • およそ15億年前 (メソプロテロゾイク初期) の化石は,初期の真核微生物で確立された細胞骨格と生態学的特性を示しています.

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Basic Methods for the Study of Reproductive Ecology of Fish in Aquaria
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Basic Methods for the Study of Reproductive Ecology of Fish in Aquaria

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Tandem Affinity Purification of Protein Complexes from Eukaryotic Cells

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Last Updated: Jan 31, 2026

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11:57

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Published on: April 10, 2018

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Basic Methods for the Study of Reproductive Ecology of Fish in Aquaria
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Basic Methods for the Study of Reproductive Ecology of Fish in Aquaria

Published on: July 20, 2017

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Tandem Affinity Purification of Protein Complexes from Eukaryotic Cells
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Tandem Affinity Purification of Protein Complexes from Eukaryotic Cells

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結論:

  • ユカリオットは地球の歴史の初期に微分化され,少なくとも27億年前に遡る証拠があります.
  • ロッパー群の発見は,真核生物の形態学的および生態学的多様化のタイムラインを大幅に後退させる.
  • これらの発見は,複雑な生命の古代起源とその前提条件を強調しています.