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関連する概念動画

The Carbon Cycle01:14

The Carbon Cycle

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Carbon is the basis of all organic matter on Earth, and is recycled through the ecosystem in two primary processes: one in which carbon is exchanged among living organisms, and one in which carbon is cycled over long periods of time through fossilized organic remains, weathering of rocks, and volcanic activity. Human activities, including increased agricultural practices and the burning of fossil fuels, has greatly affected the balance of the natural carbon cycle.
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Most plants use the C3 pathway for carbon fixation. However, some plants, such as sugar cane, corn, and cacti that grow in hot conditions, use alternative pathways to fix carbon and conserve energy loss due to photorespiration. Photorespiration is the process that occurs when the oxygen concentration is high. Under such conditions, the rubisco enzyme in the Calvin cycle binds O2 instead of CO2, which halts photosynthesis and consumes energy.
C4 Pathway
The C4 pathway is used by plants such as...
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Carbon-dioxide Fixation01:28

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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...
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Adaptations that Reduce Water Loss01:57

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Though evaporation from plant leaves drives transpiration, it also results in loss of water. Because water is critical for photosynthetic reactions and other cellular processes, evolutionary pressures on plants in different environments have driven the acquisition of adaptations that reduce water loss.
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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...
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Triglycerides are a form of long-term energy storage molecules. They are made of glycerol and three fatty acids. To obtain energy from fat, triglycerides must first be broken down by hydrolysis into their two principal components, fatty acids and glycerol. This process, called lipolysis, takes place in the cytoplasm. The resulting fatty acids are oxidized by β-oxidation into acetyl-CoA, which is used by the Krebs cycle. The glycerol that is released from triglycerides after lipolysis...
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関連する実験動画

Updated: Sep 10, 2025

Cortisol Measurement in Koala Phascolarctos cinereus Fur
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オーストラリア の マカダミア 果樹 は,主に 炭素 吸収 器 と し て 機能 する

Ganesh Bhattarai1, Rowan Eisner1, Quan Nguyen2

  • 1Tasmanian Institute of Agriculture, University of Tasmania, Newnham Dr, Newnham, Launceston, Tasmania 7248, Australia.

Environmental science & technology
|August 27, 2025
PubMed
まとめ

オーストラリアのマカダミア農場で窒素肥料の使用を減らすことで 温室効果ガス (GHG) の排出量を大幅に削減できます 多くの農場は炭素を吸収し 環境管理と農場の繁栄を向上させる 最適化された慣行があります

キーワード:
園芸による温室効果ガス排出量ライフサイクル評価多年生作物土壌の炭素

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科学分野:

  • 農業科学
  • 環境科学
  • 気候変動の緩和

背景:

  • 温室効果ガス (GHG) の削減は 世界的に重要な課題です
  • 農業は温室効果ガスの排出に大きく貢献しています
  • マカダミア栽培の環境への影響は詳細な評価が必要である.

研究 の 目的:

  • オーストラリアのマカダミア作物の温室効果ガス排出量を量化する.
  • 実践の変更を通じて温室効果ガスの削減の可能性を評価する.
  • 主要な排出源と炭素吸収因子を特定する.

主な方法:

  • マカダミア栽培のライフサイクル評価
  • 窒素肥料,燃料,電気の入力の分析
  • 土壌の有機炭素を定量化する
  • 温室効果ガス排出量のモデル化と削減の可能性

主要な成果:

  • 農場の純排出量の最大の源は窒素肥料でした (>50%).
  • 土壌の有機炭素の蓄積は,炭素の除去と排出の強さに大きく影響した.
  • 多くの農場では,推奨量以上の窒素肥料を使用しています.
  • マカダミア農場は他の多くの農業部門とは異なり 純炭素吸収場として特定されました

結論:

  • 窒素肥料の使用を最適化することで,温室効果ガスの削減の可能性が大きくなります.
  • 土地の覆いを改善し 耕作を減らすことなど 排出量を減らすことができます
  • 持続可能なマカダミア栽培は 食糧安全保障や繁栄 そして環境管理を高めることができます