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Anatomy of Chloroplasts01:07

Anatomy of Chloroplasts

Green algae and plants, including green stems and unripe fruit, harbor chloroplasts—the vital organelles where photosynthesis takes place. In plants, the highest density of chloroplasts is found in the mesophyll cells of leaves.
The Calvin Cycle01:40

The Calvin Cycle

OverviewOxygenic photosynthesis plays a central role in the global carbon and oxygen cycles. The carbohydrates produced support nearly all food webs, while the oxygen by‑product enables aerobic life.Light‑dependent and light‑independent reactionsPhotosynthesis occurs in two main stages, each in a different part of the chloroplast: light‑dependent reactions and light‑independent reactions, also called the Calvin‑Benson cycle or simply the Calvin cycle.Light‑dependent reactions take place in the...
Light Acquisition02:16

Light Acquisition

In order to produce glucose, plants need to capture sufficient light energy. Many modern plants have evolved leaves specialized for light acquisition. Leaves can be only millimeters in width or tens of meters wide, depending on the environment. Due to competition for sunlight, evolution has driven the evolution of increasingly larger leaves and taller plants, to avoid shading by their neighbors with contaminant elaboration of root architecture and mechanisms to transport water and nutrients.
The Calvin Benson Cycle01:46

The Calvin Benson Cycle

Ribulose 1,5- bisphosphate carboxylase/oxygenase (RuBisCo) is a critical enzyme that catalyzes carbon dioxide assimilation during photosynthesis. However, it is an inefficient enzyme, having an extremely slow catalytic rate. A typical enzyme can process about a thousand molecules per second; however, RuBisCo fixes only around three-carbon dioxides per second. Photosynthetic cells compensate for this slow rate by synthesizing very high amounts of RuBisCo, making it the most abundant single...
Carbon-dioxide Fixation01:28

Carbon-dioxide Fixation

Carbon dioxide fixation in prokaryotes enables the assimilation of inorganic carbon into organic molecules, supporting biosynthetic pathways, sustaining ecosystems, and contributing to the global carbon cycle. It also has industrial applications in carbon capture and bioproduct synthesis. Autotrophic organisms rely on this process to utilize CO₂ as a carbon source in diverse environments.The Calvin CycleThe Calvin cycle is the most widespread carbon fixation mechanism, primarily used by...
Green Algae01:21

Green Algae

Green algae, also referred to as chlorophytes, are different from red algae in having the chloroplasts containing chlorophylls a and b, which give them their distinct green hue. However, they lack phycobiliproteins, preventing them from developing the red or blue-green pigmentation seen in red algae. In terms of photosynthetic pigment composition, green algae closely resemble plants and share a close evolutionary relationship with them. Taxonomically Green algae belong to Phylum Chlorophyta in...

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Updated: Jun 18, 2026

In Vitro Reconstitution of Light-harvesting Complexes of Plants and Green Algae
11:55

In Vitro Reconstitution of Light-harvesting Complexes of Plants and Green Algae

Published on: October 10, 2014

中世エオセンの堆積物におけるクロロフィール誘導体

D L Dilcher, R J Pavlick, J Mitchell

    Science (New York, N.Y.)
    |June 19, 1970
    PubMed
    まとめ

    研究者らは,クロロフィルの誘導体であるメチルフェオホルバイドaを,中期エオセンの茶色の石炭で特定した. これは,化石フォルビンの最も古い報告された発生をマークし,古代の有機物質の洞察を提供します.

    科学分野:

    • パレオントロジー・パレオントロジー
    • オーガニック・ジオケミストリー オーガニック・ジオケミストリー
    • バイオジオケミストリー バイオジオケミストリー

    背景:

    • 化石化した有機物質は,古代の生態系と生地化学的過程についての洞察を提供します.
    • クロロフィル系 (ホルビン系) は,光合成生物にとって重要なバイオマーカーである.

    研究 の 目的:

    • 中世エオセンの茶色の石炭におけるクロロフィール誘導体の存在と性質を調査する.
    • 化石フォルビンの最も古い既知の発生を確立するために.

    主な方法:

    • 茶色石炭のサンプルからクロロフォームを抽出する.
    • 抽出されたピグメントの染色学的な分離.
    • スペクトル解析 (可視光,赤外線,質量スペクトロメトリー) とHCl数値の決定.

    主要な成果:

    • 抽出されたクロロフィール誘導体からメチルフェオホルビドaの識別.
    • 複数の分析技術を用いたピグメントの特徴化.
    • 炭鉱埋蔵地の中期エオセンの年代を確認.

    結論:

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    Single-throughput Complementary High-resolution Analytical Techniques for Characterizing Complex Natural Organic Matter Mixtures
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    Single-throughput Complementary High-resolution Analytical Techniques for Characterizing Complex Natural Organic Matter Mixtures

    Published on: January 7, 2019

    Elucidating the Metabolism of 2,4-Dibromophenol in Plants
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    Elucidating the Metabolism of 2,4-Dibromophenol in Plants

    Published on: February 10, 2023

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    Last Updated: Jun 18, 2026

    In Vitro Reconstitution of Light-harvesting Complexes of Plants and Green Algae
    11:55

    In Vitro Reconstitution of Light-harvesting Complexes of Plants and Green Algae

    Published on: October 10, 2014

    Single-throughput Complementary High-resolution Analytical Techniques for Characterizing Complex Natural Organic Matter Mixtures
    09:38

    Single-throughput Complementary High-resolution Analytical Techniques for Characterizing Complex Natural Organic Matter Mixtures

    Published on: January 7, 2019

    Elucidating the Metabolism of 2,4-Dibromophenol in Plants
    06:54

    Elucidating the Metabolism of 2,4-Dibromophenol in Plants

    Published on: February 10, 2023

  • 最も古いフォルビンの化石は,中期エオセンの茶色の石炭で報告されています.
  • メチルフェオホルバイドaは,古代の光合成生命の信頼できるバイオマーカーとして機能します.
  • この発見は,早期のダイアゲネシスとバイオマーカーの保存に関する私たちの理解を高めます.