Carbon Fixation
Carbon Fixation - Related Videos
01:28
Carbon-dioxide Fixation
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2025
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...
14:38
Establishment of Microbial Eukaryotic Enrichment Cultures from a Chemically Stratified Antarctic Lake and Assessment of Carbon Fixation Potential
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Cited by 5 •
2012
Microbial eukaryotes are both a source of photosynthetically-derived carbon and top predatory species in permanently ice-covered Antarctic lakes. This report describes an enrichment culture approach to isolate metabolically versatile microbial eukaryotes from the Antarctic lake, Lake Bonney, and assesses inorganic carbon fixation potential using a radioisotope assay for Ribulose-1,5-bisphophate carboxylase oxygenase (RubisCO) activity.
08:53
Whole Animal Perfusion Fixation for Rodents
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Cited by 531 •
2012
Here we describe a low-cost, rapid, controlled and uniform fixation procedure using 4% paraformaldehyde perfused via the vascular system: through the heart of the rat to obtain the best possible preservation of the brain.
01:14
The Carbon Cycle
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2019
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. Biological Carbon Cycle All...
01:03
Fixation and Sectioning
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2023
Two basic types of preparation are used to visualize specimens with a light microscope: wet mounts and fixed specimens. The simplest type of preparation is the wet mount, in which the specimen is placed in a drop of liquid on the slide. A liquid specimen can be directly deposited on the slide using a dropper. Solid specimens, such as skin scraping, can be placed on the slide before adding a drop of liquid to prepare the wet mount. Sometimes the liquid is simply water, but stains are often added...
FAQs
Rubisco catalyzes the step that attaches carbon dioxide to a carbon compound, initiating its incorporation into organic material. ATP supplies energy, while NADPH provides reducing power for subsequent reactions in the Calvin cycle. Together, these components convert inorganic carbon into carbohydrate precursors that can support cellular growth and contribute to biomass production.
Carbon incorporation requires more than the presence of carbon dioxide. ATP drives the energy-demanding reactions of the Calvin cycle, and NADPH supplies the reducing power needed to form more reduced organic molecules. Their coordinated use allows the cycle to transform carbon dioxide into carbohydrate precursors rather than leaving carbon in an inorganic form.
Comparing C3, C4, and CAM plants highlights that carbon fixation is not organized identically across all photosynthetic organisms. These plant categories provide a framework for studying differences in carbon-processing strategies and their relationship to plant productivity. Such comparisons help biologists explain variation in growth and evaluate approaches for improving crop performance.
The sequence begins when carbon dioxide enters the Calvin cycle and Rubisco catalyzes its attachment to a carbon compound. ATP and NADPH then support reactions that generate carbohydrate precursors. Those organic products connect atmospheric carbon to cellular growth, allowing fixed carbon to contribute to plant biomass and, more broadly, to material available within food webs.
Studying carbon fixation helps researchers examine why plants differ in productivity and how carbon-processing strategies relate to growth. Comparisons among C3, C4, and CAM plants can provide relevant biological context when evaluating crop performance. The same knowledge may guide strategies intended to increase biomass production, although the specific improvement depends on the plant system being studied.
By transferring atmospheric carbon dioxide into organic molecules, carbon fixation supplies carbon that supports cellular growth and biomass production. That biomass forms a foundation for food webs, linking photosynthetic organisms with other ecosystem components. At a larger scale, the process connects biological activity with global carbon cycling and helps explain how atmospheric carbon enters living systems.
Carbon fixation provides the biological entry point through which atmospheric carbon dioxide becomes organic material. Because fixed carbon can contribute to plant biomass, studying the process is relevant to biological carbon sequestration strategies. Research in this area considers how photosynthetic organisms might help retain more carbon in living material while also supporting growth and ecosystem productivity.