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Topic: C4 carbon fixation

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C3 carbon fixation

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	C4 carbon fixation Summary
		C4 carbon fixation is one of three methods, along with C3 and CAM photosynthesis, used by land plants to "fix" carbon dioxide (binding the gaseous molecules to dissolved compounds inside the plant) for sugar production through photosynthesis.
		C4 plants have a competitive advantage over plants possessing the more common C3 carbon fixation pathway under conditions of drought, high temperatures and nitrogen or carbon dioxide limitation.
		C4 carbon fixation has evolved on several occasions in different groups of plants, so is an example of convergent evolution.
	www.bookrags.com /C4_carbon_fixation (1233 words)

	Encyclopedia :: encyclopedia : Carbon (Site not responding. Last check: 2007-10-21)
		Carbon is a chemical element in the periodic table that has the symbol C and atomic number 6.
		Carbon is a vital component of all known living systems, and without it life as we know it could not exist (see alternative biochemistry).
		The most prominent oxide of carbon is carbon dioxide, CO This is a minor component of the Earth's atmosphere, produced and used by living things, and a common volatile elsewhere.
	www.hallencyclopedia.com /topic/Carbon.html (2175 words)

	Agroecology Glossary: A - D
		C4 pathway A metabolic pathway for photosynthetic carbon fixation that is common in tropical plants that have high rates of growth and photsynthesis and are adapted to high temperatures, high light intensity, low
		carbon dioxide compensation point The concentration of carbon dioxide in a plant’s chloroplasts below which the amount of photosynthate produced fails to compensate for the amount of amount of photosynthate used in respiration.
		carbon fixation The part of the photosynthetic process in which carbon atoms are extracted from atmospheric carbon dioxide and used to make simple organic compounds that eventually become glucose.
	www.agroecology.org /glossary/glossary_a_d.htm (1631 words)

	C4 carbon fixation - Wikipedia, the free encyclopedia
		In maize and sugarcane, the enzyme is NADP-malic enzyme, in millet, it is NAD-malic enzyme, and in Panicum maximum it is PEP carboxykinase.
		C4 plants have a competitive advantage over plants possessing the more common C3 carbon fixation pathway under conditions of drought, high temperatures and nitrogen or carbon dioxide limitation.
		C4 carbon fixation has evolved on several occasions in different groups of plants, so is an example of convergent evolution.
	en.wikipedia.org /wiki/C4_carbon_fixation (502 words)

	CRC for Greenhouse Accounting - Counting carbon: Soils
		Carbon dioxide, a major greenhouse gas, is absorbed by plants, which store the carbon in roots, stems, leaves and the soil.
		Samples are being taken from old native pasture, adjacent improved pasture and a 16-year-old pine plantation to measure carbon and nitrogen pools in soil, fine-root, coarse-root, surface-litter, wood, branch and leaf stocks in each land-cover type, and the fluxes of carbon in the form of new growth, fine-root turnover, litter formation and litter decomposition.
		Carbon isotope analysis of whole and size-separated soil organic matter has been used successfully to trace the history of an increasing density and coverage of trees in Australia's tropical grazed grasslands, a process known as 'woody thickening'.
	www.greenhouse.crc.org.au /counting_carbon/soils.cfm (1379 words)

	Isotopes
		C4 plants eliminate photorespiration by fixing CO2 to a 4 carbon molecule in one cell and then passing this molecule on to another cell that is kept relatively oxygen free.
		C4 carbon fixation has evolved on several occasions in different groups of plants, but is typically found in tropical grasses like maize, sorghum, amaranth, finger millet, fonio (a variety of crabgrass), sugarcane, switchgrass.
		C4 plants are still deficient in heavy isotopes of carbon, but less so than C3 plants; that is, C4 plants are richer in heavy carbon that C3 plants.
	hypertextbook.com /physics/modern/isotopes (1467 words)

	Rising Carbon Dioxide is Great for Plants
		Carbon dioxide is the basic raw material that plants use in photosynthesis to convert solar energy into food, fiber, and other forms of biomass.
		C4 plants also experience a boost in photosynthetic efficiency in response to higher carbon dioxide levels, but because there is little photo-respiration in C4 plants, the improvement is smaller than in C3 plants.
		The carbon dioxide level in the atmosphere begins to fall in the spring, and continues to fall through the summer months, as CO2 is removed by the vegetative cover of the north.
	www.purgit.com /co2ok.html (3536 words)

	C4 - Biocrawler (Site not responding. Last check: 2007-10-21)
		C4, a pathway for carbon fixation in photosynthesis.
		HMS C4, a C-class submarine of the Royal Navy.
		C4, an international standard paper size (229×324 mm), defined in ISO 216.
	www.biocrawler.com /encyclopedia/C4 (211 words)

	Oral Fixation -- Recommendations and Resources (Site not responding. Last check: 2007-10-21)
		An oral fixation (also oral craving) is a fixation in the oral stage of development and manifested by an obsession with stimulating the mouth (oral), first described by Freud.
		C3 carbon fixation is a pathway for carbon fixation in photosynthesis.
		Plants that survive solely on C3 fixation tend to thrive in areas where sunlight intensity is moderate, temperatures are moderate, carbon dioxide concentrations are around 200 ppm or higher, and ground water is plentiful.
	www.becomingapediatrician.com /health/108/oral-fixation.html (1136 words)

	Increasing carbon dioxide relieves drought stress in corn, researchers say
		However, Leakey found that in a carbon dioxide concentration of 550 parts per million, carbon fixation in the leaves indeed rose in association with greater intercellular carbon dioxide and enhanced water use efficiency.
		Since carbon dioxide serves to close the stomata, which are tiny pores in the epidermal layer of leaves, the jump in photosynthesis likely resulted from the plant maintaining higher water content in the leaves during the dry period, Long said.
		In soybeans, initial exposure to carbon dioxide led to increased yields that were later dramatically reversed by the effects of ozone.
	www.eurekalert.org /pub_releases/2003-07/uoia-icd072503.php (576 words)

	Plant Physiology
		Carbon dioxide is limiting to plants that photorespire - for evidence see: (a) plot of carbon dioxide fixation vs. carbon dioxide concentration for maize and red clover (photorespires); and (b) plot of carbon dioxide uptake vs. fluence for tobacco and maize at ambient oxygen at varying carbon dioxide levels.
		The purpose of this pathway is to metabolize and reclaim the carbon in phosphoglycolate
		In C4 plants, the Calvin cycle activity occurs primarily in the bundle sheath cells, whereas PSII activity occurs in the mesophyll cells.
	employees.csbsju.edu /ssaupe/biol327/Lecture/photosyn-carbon.htm (1788 words)

	C3 carbon fixation - Wikipedia, the free encyclopedia
		C3 carbon fixation is a metabolic pathway for carbon fixation in photosynthesis.
		Plants that survive solely on C3 fixation (C3 plants) tend to thrive in areas where sunlight intensity is moderate, temperatures are moderate, carbon dioxide concentrations are around 200 ppm or higher, and ground water is plentiful.
		C4 and CAM plants have adaptations that allow it survive in areas where the plant cannot take in a lot of carbon dioxide.
	en.wikipedia.org /wiki/C3_carbon_fixation (275 words)

	carboniso (Site not responding. Last check: 2007-10-21)
		C of inorganically precipitated carbonate in the oceans is very close to that of the total dissolved carbonate in the oceans, which is the main reservoir of dissolved carbon.
		The carbon isotopic composition of CO in the atmosphere, which is what the plants use in photosynthesis, is about -6 to -7‰.
		C4 plants are known only since the Cenozoic and have been common only since the later part of the Miocene (about 11 million years ago).
	ethomas.web.wesleyan.edu /ees123/carboniso.htm (1469 words)

	UB Department of Biological Sciences: James O. Berry
		Amaranth uses the highly specialized C4 photosynthetic pathway, which allows this plant to be very efficient in the assimilation or fixation of atmospheric CO into biologically useful molecules.
		C4 plant species possess a specialized leaf organization, which is characterized by the presence of two separate photosynthetic cell types - the mesophyll and bundle sheath cells.
		C4 photosynthetic requires interactions between enzymes which are specifically compartmentalized to one or the other cell type and selective cell type specific expression of genes encoding the C4 enzymes.
	wings.buffalo.edu /fnsm/bio-sci/dept/faculty/berry/berry.html (758 words)

	[No title] (Site not responding. Last check: 2007-10-21)
		Plants found principally in hot climates whose initial fixation of carbon dioxide in photosynthesis is by the HSK pathway.
		C4 carbon fixation is a common metabolic pathway found in land plants (C4 plants).
		The C4 cycle allows for a spacial separation of carbon fixation from respiration, thus allowing C4 plants to increase concentration of CO within their leaves.
	www.geocities.com.cob-web.org:8888 /arunsinha2000/eclectic/glossary_arch.html (1813 words)

	photosynthesis Lecture (Site not responding. Last check: 2007-10-21)
		A special variation on photosynthetic carbon fixation is found in maize (corn) and other tropical grasses is known as C4 photosynthesis.
		C4 plants are more efficient at fixing carbon dioxide under conditions of high light and temperature (e.g.
		One aspect of C4 plants is a specialized leaf anatomy, where mesophyll cells (light green) surround bundle-sheath cells (dark green).
	www.bios.niu.edu /sims/metabolism/metabolism20.htm (106 words)

	Forest Biology and Ecology for Educators
		All the carbon in your own body was gathered out of the air and transformed into a carbohydrate by a plant through the process of photosynthesis.
		In the bundle sheath cells, the 4 carbon acid is split to a 3 carbon compound and CO This CO is then fixed by the Calvin cycle.
		Since carbon dioxide is directly involved in photosynthesis as a substrate it is not to suprising that photosynthesis shows a strong response to carbon dioxide concentration.
	www.cnr.vt.edu /dendro/forbioeco/htmltext/chapter3.htm (3574 words)

	Bio 120
		C4 Photosynthesis - The initial CO fixation reaction in Photosynthesis involves the enzyme ribulose-1,5-bisphosphate carboxylase/oxygenase (RuBisCO).
		To a Plant, Carbon Fixation is by far the preferred reaction, but as the CO concentration of the atomosphere (0.03%) is very much lower than the oxygen concentration (20%), photorespiration does occur at significant levels.
		As in C4 plants the released CO is then fixed to RuBP and the resultant Calvin cycle occurs.
	bioweb.wku.edu /courses/Biol120/images/C4.htm (630 words)

	C4 carbon fixation - Free net encyclopedia (Site not responding. Last check: 2007-10-21)
		Image:HatchSlackpathway.png C4 carbon fixation is a metabolic pathway found in some land plants (C4 plants).
		They have a competitive advantage over plants possessing the more common C3 carbon fixation pathway under conditions of drought, high temperatures and nitrogen limitation.
		C4 plants are known only since the Cenozoic and did not became common until the Miocene.
	www.netipedia.com /index.php/C4_plants (467 words)

	Botany online: Photosynthesis - C3, C4 and CAM. Regulation of The Activity
		The oxaloacetate is usually converted into malate of which the carbon dioxide is split off again with the help of an enzyme.
		The reversible binding of carbon dioxide has the function to accumulate and store CO The process consumes energy, so that it could also be spoken of a carbon dioxide pump.
		The prefixed carbon dioxide is stored in the vacuoles as malate (and isocitrate) and is used during the daytime for photosynthesis.
	www.biologie.uni-hamburg.de /b-online/e24/24b.htm (1272 words)

	Education Resources » Isotopic signature
		Similarly, carbon in inorganic carbonates shows little isotopic fractionation, while carbon in materials originated by photosynthesis is depleted of the heavier isotopes.
		The different isotope ratios for the two kinds of plants propagate through the food chain, thus it is possible to determine if the principal diet of a human or an animal consists primarily of C3 plants (rice, wheat, soybeans, potatoes) or C4 plants (corn, or corn-fed beef) by isotope analysis of their flesh and bones.
		Carbon in artificially made chemicals is usually derived from fossil fuels like coal or petroleum, where the
	www.thecatalyst.org /resource/2006/04/21/Isotopic-signature (569 words)

	Term paper on C4 (Site not responding. Last check: 2007-10-21)
		Term paper on C4 '''C4''' can mean: C4 is an envelope size designed to hold A4 paper size documents.
		C4 is an envelope size designed to hold A4 paper size documents.
		C4 carbon fixation, a chemical reaction in photosynthesis.
	www.termpapertopic.org /c4/c4.html (90 words)

	DARK REACTIONS
		Every carbon atom of every organic molecule in your body was once a CO molecule that passed through plant enzymes to make it a genuine organic molecule.
		The carbohydrates formed during carbon fixation is the dominant stable chemical energy form resulting from the light energy capturing reactions.
		C4 plants use a slightly different method, a process that will be discussed later.
	www.mrs.umn.edu /~goochv/CellBio/lectures/darkrxn/darkrxn.html (1057 words)

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