carbon


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Related to carbon: carbon cycle, graphite, hydrogen

carbon

 (C) [kahr´bon]
a chemical element, atomic number 6, atomic weight 12.011. (See Appendix 6.)
carbon 11 a radioactive isotope of carbon, atomic mass 11, having a half-life of 20.39 minutes; used as a tracer in positron emission tomography.
carbon 14 a radioactive isotope of carbon, atomic mass 14, having a half-life of 5730 years; used as a tracer in cancer and metabolic research.

car·bon (C),

(kar'bŏn),
A nonmetallic tetravalent element, atomic no. 6, atomic wt. 12.011; the major bioelement. It has two natural isotopes, 12C and 13C (the former, set at 12.00000, being the standard for all molecular weights), and two artificial, radioactive isotopes of interest, 11C and 14C. The element occurs in three pure forms (diamond, graphite, and in the fullerines), in amorphous form (in charcoal, coke, and soot), and in the atmosphere as CO2. Its compounds are found in all living tissues, and the study of its vast number of compounds constitutes most of organic chemistry.
[L. carbo, coal]

carbon

(kär′bən)
n.
1. Symbol C An abundant nonmetallic element that occurs in many inorganic and in all organic compounds, exists freely in amorphous, graphite, and diamond forms and as a constituent of coal, limestone, and petroleum, and is capable of chemical self-bonding to form an enormous number of chemically, biologically, and commercially important molecules. Other significant allotropes include fullerenes and nanotubes. Atomic number 6; atomic weight 12.011; sublimation point 3,825°C; triple point 4,489°C; specific gravity of amorphous carbon 1.8 to 2.1, of diamond 3.15 to 3.53, of graphite 1.9 to 2.3; valence 2, 3, 4. See Periodic Table.
2. A carbon-containing gas, notably carbon dioxide, or a collection of such gases, especially when considered as a contributor to the greenhouse effect: plans for capturing and sequestering carbon produced by power plants.
3.
a. A sheet of carbon paper.
b. A carbon copy.
4. Electricity
a. Either of two rods through which current flows to form an arc, as in lighting or welding.
b. A carbonaceous electrode in an electric cell.

car′bon·ous (-bə-nəs) adj.

carbon

Chemistry
A nonmetallic tetravalent element (atomic number, 6; atomic weight, 12.01), which is central to all forms of life, and a core constituent of organic molecules.
 
Materials science
Because of its chemical properties, carbon has potential for use with silicon as a low-activation structural material for fusion reactors, as silicon carbide.

car·bon

(C) (kahr'bŏn)
A nonmetallic tetravalent element, atomic no. 6, atomic wt. 12.011; the major bioelement. It has two natural isotopes, 12C and 13C (the former, set at 12.00000, being the standard for all molecular weights), and two artificial, radioactive isotopes of interest, 11C and 14C. The element occurs in diamond, graphite, charcoal, coke, and soot, and in the atmosphere as CO2. Its compounds are found in all living tissues, and the study of its vast number of compounds constitutes most of organic chemistry.
[L. carbo, coal]

carbon

The non-metallic element on which all organic chemistry is based and which is thus present in all organic matter. A carbon atom is capable of combining with up to four other atoms (tetravalent), including other carbon atoms; it is this property that allows so many compounds to be formed.

carbon

the element which is the basis of organic structure. Carbon has a valency of four, each atom forming four covalent bonds in its compounds. Long chains may be formed which give rise to the complexity of many organic compounds.

car·bon

(C) (kahr'bŏn)
Nonmetallic tetravalent element found in all living tissues; the study of its vast number of compounds constitutes most of organic chemistry.
[L. carbo, coal]

Patient discussion about carbon

Q. hi my name is ray i am from england and i am on oxygen i am a retainer of carbon monxide do you guys know whoa any place working with stem cell or natural medical emial rsantolla@aol.co.uk

A. i had a whole course on stem cell use in tissue engineering and from what i know this is an area that still in research and very little clinical use. the ability to create lungs from Mesenchimal Stem Cells is a far away dream right now. but here are some links to labs that research that area:
http://organizedwisdom.com/Stem_Cells_for_Emphysema

More discussions about carbon
References in periodicals archive ?
Unlike emissions reductions in the industrial sector, which arguably might be considered permanent, carbon in the biosphere could be released at some point in the future, for example through fires or deliberate human activity.
"I actually don't think the Kyoto Protocol will ever be implemented--there are just too many political difficulties--but I do think something will be implemented and that carbon credits will be part of it," says utility executive Pruett.
Iowa is not the only state looking into soil sequestering as a basis for carbon trading.
In the second step, the preconditioned carbon is attrited in a model pulp system.
Before the conversion, the four carbon black storage silos shared a single dust collector.
Under more severe pouring conditions, such as when using gating systems that produce turbulent flow and can cause cold shuts, lustrous carbon films can be flushed into the body of the casting or become sandwiched between two merging streams of molten metal (Fig.
Under the 1997 Kyoto agreement, targets are set for the reduction of greenhouse gases, particularly carbon dioxide, among the world's industrialized nations.
CQESTR was developed to calculate how a range of agronomic and weather-related variables could affect crop residue decomposition and soil carbon sequestration levels.
We reduce potential future carbon emissions by: * Opening markets for low carbon technologies; * leading industry collaborations to commercialise technologies; * investing in early-stage low carbon companies.
Tokai Carbon Fine Carbon Division has already 8 subsidiaries, affiliates and offices - 3 in Europe, 2 in USA and 3 in Asia, CIP Group becomes the 9th member of global network and contributes to world wide business strategy of Tokai Carbon.
Previous studies showed that HO-1 is activated in the presence of inflammatory immune system cells and that carbon monoxide slows inflammation.