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Topic: C3 carbon fixation

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	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.
		C3 plants must be in areas with high concentrations of carbon dioxide because RuBisCO often incorporates an oxygen molecule into the RuBP, instead of a carbon dioxide molecule.
	en.wikipedia.org /wiki/C3_carbon_fixation (288 words)

	[No title] (Site not responding. Last check: 2007-10-09)
		Carbon fixation occurs in the mesophyll, and the C3 cycle occurs in the parenchyma sheath.
		Carbon fixation occurs in the mesophyll and the C3 cycle occurs in the innermost parenchyma sheath.
		Carbon fixation occurs in the mesophyll and the C3 cycle occurs in the mestome sheath.
	www.homepage.montana.edu /~mlavin/b434/leaftype.html (282 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 (1358 words)

	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.ibpassociation.org /encyclopedia/Chemistry/Isotopic_signature.php (560 words)

	Rising Carbon Dioxide is Great for Plants (Site not responding. Last check: 2007-10-09)
		Carbon dioxide is the basic raw material that plants use in photosynthesis to convert solar energy into food, fiber, and other forms of biomass.
		Indeed, the conventional wisdom in public policy circles is that carbon dioxide is a terrible pollutant that threatens the fate of the earth.
		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)

	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
		carbon dioxide is released in the mitochondria and is hence the reason this is a type of "respiration".
	employees.csbsju.edu /ssaupe/biol327/Lecture/photosyn-carbon.htm (1788 words)

	Climatic Variation And Change: Implications For Agriculture In The Pacific Rim
		In general, increased carbon dioxide is beneficial to the growth of plants such as wheat which have what is called a "C3" carbon fixation metabolism, but not to plants such as sugar cane and sorghum which are "C4" plants.
		In C3 plants, the rate of carbon fixation is unsaturated with the present level of carbon dioxide in the atmosphere and will increase in the condition of elevated carbon dioxide concentration without an increase in water loss; therefore, the efficiency of water use for carbon fixation will also increase.
		However, the carbon fixation rates of the C4 plants are already saturated with the present carbon dioxide concentration in the atmosphere, and so any further increase in the ambient carbon dioxide will not directly affect their carbon fixation and water use.
	www.ciesin.org /docs/004-607/004-607.html (4532 words)

	Isotopes
		C3 plants evolved 500 or more million years ago when the atmosphere was higher in CO2 and lower in oxygen.) The rate of this unwanted process is higher at higher temperatures.
		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.
	hypertextbook.com /physics/modern/isotopes (1735 words)

	carboniso
		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‰.
		Carbon isotope studies of bone material from the burial grounds indicated that the Viking settlers started out by feeding dominantly on C3 type plants (for instance, wheat).
	ethomas.web.wesleyan.edu /ees123/carboniso.htm (1469 words)

	A Comparison of RuBisCo Protein Expression in Bundle-Sheath Cells of CAM & C3 Plants
		refers to the light-dependent carbon dioxide release and oxygen uptake which is caused by the fixation of oxygen instead of carbon dioxide.
		All of the carbon fixation occurs in the mesophyll cells of C3 plants, whereas in CAM plants photosynthesis and carbon fixation are physically separated.
		This is because it is known that the C3 cycle (a.k.a.
	csmres.jmu.edu /biology/Bio480/Fall05/Tuesday5/intro.htm (845 words)

	Plant Science Exam 2, 1995
		First stable compound formed in C3 carbon fixation.
		First stable compound formed in C4 carbon fixation.
		In C3 carbon fixation ___ molecules of PGA are formed whereas in photorespiration _____ molecules of PGA are formed.(2)
	www.uwrf.edu /~dc01/2pse.html (570 words)

	Carbonates – carbon
		Although the quantity of certain carbon reservoirs, such as the atmosphere are relatively small, the fluxes in and out of these reservoirs can be quite high, so that their abundance (as in the case of atmospheric CO can be important, as well as their carrying capacity between other reservoirs.
		C values of dissolved organic carbon (DOC) will be a function of the storage of carbon in one or the other of the two main reservoirs or the degree of mixing of the ocean.
		C values of carbonates and most diamonds are in a very narrow range of –6 ‰, but some diamonds are well outside of this range, from greater to –30 ‰ to typical marine carbonate values, indicating a contribution of subducted continental carbon.
	epswww.unm.edu /facstaff/zsharp/505/carbonates2.htm (3530 words)

	February 10 Lecture Notes
		This C4 compound is shunted to the bundle sheath, where it's converted to a C3 compound and carbon dioxide, which is then captured like before." The improvement is that PEP carboxylase has a very high affinity for its substrate and a higher v-max than Ribisco, the enzyme associated with the C3 cycle.
		Carbon dioxide is therefore concentrated in the bundle sheath cells an order of magnitude higher than in C3 plants, and photorespiration is effectively eliminated.
		Two additional ATP are used to reduce a carbon dioxide molecule, and light use efficiency (carbon dioxide fixed per unit of light absorbed) should therefore be lower.
	culter.colorado.edu:1030 /~tims/feb12.html (1145 words)

	Todd's biblio
		While it is commonly known that average 13C values for C3 plants are about -26, and about -13 for C4, the carbon isotope composition for C3 ecosystems has been reported to be as low as -23 to -20 in arid environments due to moisture stress.
		Carbon fixation in C3 plants is catalyzed by Rubisco (ribulose-1,5-biphosphate carboxylase/oxygenase).
		Not until the late 1960's was it discovered that the fractionation of the stable carbon isotopes was largely due to differences in the metabolic pathways during photosynthesis.
	www.uvm.edu /~pbierman/classes/gradsem/1998/toddm.html (3941 words)

	C4 carbon fixation - Wikipedia, the free encyclopedia
		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.
		Along with CAM photosynthesis, C4 fixation is an improvement over the simpler and more ancient C3 carbon fixation strategy used by most plants.
		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 (515 words)

	Re: Photosynthetic carbon assimilation pathways
		The evolution of different carbon fixation and anatomical pathways is a response to multiple environmental stressors such as low carbon dioxide concentrations, high oxygen concentrations, water scarcity, and high light and temperature conditions.
		The fixation product is then transported to cells in the interior of the plant leaf (bundle-sheath cells), and the CO2 is removed (decarboxylated).
		The decarboxylation produces a carbon dioxide-rich environment away from the oxygen-rich leaf surface, where the newly released carbon dioxide can be efficiently re-fixed by RUBISCO, where it enters the normal C3 pathway.
	www.madsci.org /posts/archives/may96/826747386.Bt.r.html (511 words)

	Concepts of Biology
		Water supplies the electrons for the reduction of carbon dioxide; water is cleaved in the process yielding oxygen as a byproduct.
		Phosphoglycolate is further metabolized in the peroxisome and mitochondria and some (75%) of the carbon in PGA is eventually reclaimed.
		The other carbons atoms are released as carbon dioxide from the mitochondria (not associated with cellular respiration) and hence the reason this is called a "respiration".
	employees.csbsju.edu /SSAUPE/biol115/photosynthesis.htm (3274 words)

	Biology 2402 Lecture Notes - Photosynthesis Part 2. The Dark Reactions
		Melvin Calvin won a Nobel prize in chemistry for elucidating the pathway of carbon fixation in plants.
		For this reason the pathway of carbon fixation in most plants is referred to as C3 photosynthesis.
		A significant portion (25%) of the carbon in phosphoglycolate is lost as CO Plants must use energy to "recover" the remaining 75% of this carbon, which further limits the efficiency of photosynthesis.
	www.ualr.edu /botany/darkrxns.html (1802 words)

	Photosynthesis
		CARBON DIOXIDE is the main source of carbon and WATER is the source of the hydrogen atoms.
		The reactions in which sugar is formed from carbon dioxide and water, using energy from the grana, takes place in the stroma.
		Six revolutions of the cycle with the introduction of 6 CO are needed to produce a 6 carbon sugar.
	www.angelfire.com /ga2/nestsite2/webunit7.html (2372 words)

	Environmental Effects on Carbon Isotope Fractionation (Site not responding. Last check: 2007-10-09)
		It is obvious that if information on carbon isotopes is to be used to accurately interpret the geological record or determine source carbon, the complete range of factors influencing carbon isotope fractionation must be addressed.
		Dissolved inorganic carbon (DIC) in seawater is enriched by approximately -0.5 to -1.4
		Stable carbon isotope fractionation by marine phytoplankton in response to daylength, growth rate, and CO availability.
	www.fiu.edu /~vcorne01/paper.htm (3054 words)

	Hyperstition: Coffee vs. Oil: the cult of the Blob has now a rival!
		Carbon from carbon dioxide is "fixed" into a larger carbohydrate.
		C3 fixation occurs as the first step of the Calvin cycle in all plants.
		C4 carbon fixation is a metabolic pathway found in some land plants (C4 plants).
	hyperstition.abstractdynamics.org /archives/006265.html (4267 words)

	[No title] (Site not responding. Last check: 2007-10-09)
		Fix CO by adding it to phosphoenolpyruvate which is transported from the mesophyll cells to the "bundle sheath" cells where decarboxylation and refixation by respiration occurs.
		Nitrogen fixation requires the simultaneous reduction of 2 N in a tightly bound nitrogenase enzyme.
		Carbon isotope ratios in tissues - Koch shows enrichment, but note the spread between muscle, collagen, hydroxy apatite (which has CO Nitrogen isotope ratios - are dominated by trophic enrichment.
	www.ims.uaf.edu /isotopes/class/Plants.html (1021 words)

	Light-Independent Reactions
		The endergonic (def) light-independent reactions of photosynthesis use the ATP and NADPH synthesized during the exergonic (def) light-dependent reactions to provide the energy for the synthesis of glucose and other organic molecules (def) from inorganic carbon dioxide and water.
		This is done by "fixing" carbon atoms from CO to the carbon skeletons of existing organic molecules.
		The carbon that was a part of inorganic CO is now part of the carbon skeleton of an organic molecule.
	student.ccbcmd.edu /~gkaiser/biotutorials/photosyn/lindr.html (431 words)

	agron435 exam 2,1995
		The CO2 concentration at which C3 plants must open the somata to take in CO2 or enter a carbon deficit is (higher;lower) than for C4 plants.
		During nitrogen fixation N2 is reduced to ______ by the______ enzyme complex.
		Electrons used for the reduction reactions in nitrogen fixation are supplied via respiration of carbohydrates produced by the (plant;bacteria).
	www.uwrf.edu /~dc01/exam295.html (946 words)

	Other Terrestrial Sediments (Site not responding. Last check: 2007-10-09)
		The oxygen isotopic composition of stalagmites is a proxy for the isotopic composition of precipitation, and thus reflect temperature and precipitation amount.
		The carbon isotopic composition of stalagmites reflects short term variability of vegetation (C3 vs. C4) and soil microbial activity.
		Carbon isotopic composition can also reflect long term changes in vegetation type and cover, and it is an excellent recorder of onset of agricultural activity on the surface above a cave.
	www.ccrc.sr.unh.edu /hipp/KduWkshp_contents/2-6.html (890 words)

	Key to Chapter 10: Photosynthesis
		Oxygen would have been produced in both types of autotrophic organisms -- from the reactants carbon dioxide and hydrogen sulfide in the purple sulfur bacteria, and from the reactants carbon dioxide and water in plants.
		Regeneration phase: most of the G3P is recycled to serve as the substrate for carbon fixation; i.e., regeneration of RuBP.
		Compartmentalization in time; initial carbon fixation occurs at night (reducing water loss) and Calvin cycle runs during the day (when ATP and NADPH are available)
	trc.ucdavis.edu /klgerhart/Keys/KeyCh10.htm (638 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.
		Taking carbon dioxide from the air and making it into an organic molecule (carbon fixation).
	www.mrs.umn.edu /~goochv/CellBio/lectures/darkrxn/darkrxn.html (1057 words)

	Canolfan Edward Llwyd (Site not responding. Last check: 2007-10-09)
		The point at which these two processes balance each other out is called the carbon dioxide compensation point, where there is no net gain or loss of carbon.
		This is the reason that C3 plants are better adapted to increased levels of CO2 than C4 species.
		It is the net carbon gain that causes growth of the plant i.e.
	www.aber.ac.uk /hinsawdd/climate/photo-CO2.htm (396 words)

	Bio 120
		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.
		The carbon dioxide collected at night through the open stomata is stored as organic acids until the day.
		During the day, the CO is released from these organic acids inside the leaf and functions to drive the Calvin cycle (Carbon Fixation).
	bioweb.wku.edu /courses/Biol120/images/C4.htm (630 words)

	The Ultimate C3 - American History Information Guide and Reference
		C3, a pathway for carbon fixation in photosynthesis.
		C3 plants, plants that primarly use the C3 pathway.
		C3, an international standard paper size (324×458 mm), defined in ISO 216.
	www.historymania.com /american_history/C3 (88 words)

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