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相关概念视频

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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Carbon-dioxide Fixation01:28

Carbon-dioxide Fixation

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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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Respiration Pathways01:26

Respiration Pathways

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Cellular respiration is a fundamental metabolic process that enables organisms to generate energy from organic molecules. One of its central pathways is the tricarboxylic acid (TCA) cycle, also known as the Krebs cycle, which plays a crucial role in energy production and biosynthetic processes.Conversion of Pyruvate to Acetyl-CoAThe pyruvate generated from glycolysis undergoes oxidative decarboxylation by the pyruvate dehydrogenase complex, producing acetyl-CoA, one molecule of NADH, and one...
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Carbon Dioxide Transport in the Blood01:19

Carbon Dioxide Transport in the Blood

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Carbon dioxide (CO2) transport in the blood is critical to human physiology. On average, our body cells produce around 200 mL of CO2 per minute, precisely the quantity expelled by the lungs. This process involves the transportation of CO2 from the tissue cells to the lungs in three primary forms.
Forms of CO2 Transport
1. Dissolved in plasma: A small percentage (7-10%) of CO2 is transported and dissolved directly in the plasma.
2. Carbaminohemoglobin: Just over 20% of CO2 is chemically bound to...
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Short-distance Transport of Resources02:12

Short-distance Transport of Resources

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Short-distance transport refers to transport that occurs over a distance of just 2-3 cells, crossing the plasma membrane in the process. Small uncharged molecules, such as oxygen, carbon dioxide, and water, can diffuse across the plasma membrane on their own. In contrast, ions and larger molecules require the assistance of transport proteins due to their charge or size. Transport across membranes also occurs within individual cells, playing a variety of essential roles for the plant as a whole.
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Otto and Diesel Cycle01:27

Otto and Diesel Cycle

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An Otto engine is a four-stroke engine that uses a mixture of gasoline and air as the working fuel. The fuel is injected into the cylinder, and the piston is moved completely down so that the cylinder is at maximum volume. By moving the piston up, adiabatic compression takes place. The spark plug ignites the gasoline-air mixture, and the burning fuel adds heat to the system at a constant volume. The heated mixture expands adiabatically and gets further cooled by exhausting heat, and this cyclic...
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相关实验视频

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Laboratory Production of Biofuels and Biochemicals from a Rapeseed Oil through Catalytic Cracking Conversion
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探索美国客运和货运流动的脱碳途径.

Christopher Hoehne1, Matteo Muratori2, Paige Jadun1

  • 1National Renewable Energy Laboratory, Golden, CO, USA.

Nature communications
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概括

到2050年实现80%的温室气体减排,需要快速采用零排放汽车和清洁的电网. 可持续生物燃料对航空和传统车辆至关重要,而管理旅行需求则有助于转型.

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Implementation of Portable Emissions Measurement Systems PEMS for the Real-driving Emissions RDE Regulation in Europe
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Measuring Carbon-based Contaminant Mineralization Using Combined CO2 Flux and Radiocarbon Analyses
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Measuring Carbon-based Contaminant Mineralization Using Combined CO2 Flux and Radiocarbon Analyses

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Laboratory Production of Biofuels and Biochemicals from a Rapeseed Oil through Catalytic Cracking Conversion
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科学领域:

  • 环境科学 环境科学
  • 能源政策 能源政策
  • 运输工程 运输工程

背景情况:

  • 运输部门占美国温室气体 (GHG) 排放量的28%.
  • 减碳运输对于实现气候目标至关重要.

研究的目的:

  • 探索到2050年在美国运输部门显著减少温室气体 (GHG) 的途径.
  • 分析包括技术,政策和旅行行为在内的各种场景对减排的影响.

主要方法:

  • 使用了国家可再生能源实验室 (NREL) 运输能源和移动途径 (TEMPO) 模型.
  • 模拟了各种不同的场景,对未来的旅行,技术和政策进行了限制性假设.

主要成果:

  • 多种途径可以在2050年前实现80%或更多的井到轮温室气体减排.
  • 零排放汽车 (ZEV) 的销量必须快速增长,在中位数情景中,到2040年轻型和货运的销量必须达到100%.
  • 需要大量的电力 (高达3000 TWh) 和可持续的生物燃料 (航空业10-42亿加).

结论:

  • 通过积极部署ZEV和电网电气化,可以实现交通的深度脱碳.
  • 可持续生物燃料对于航空业等难以减排的行业以及现有车队至关重要.
  • 管理旅游需求增长是减少整体能源需求和促进转型的关键策略.