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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.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.

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]
Farlex Partner Medical Dictionary © Farlex 2012

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.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.

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.
Segen's Medical Dictionary. © 2012 Farlex, Inc. All rights reserved.

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]
Medical Dictionary for the Health Professions and Nursing © Farlex 2012

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.
Collins Dictionary of Medicine © Robert M. Youngson 2004, 2005

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.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005

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]
Medical Dictionary for the Dental Professions © Farlex 2012

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
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References in periodicals archive ?
To this end, the Oxford group synthesized a precursor to cyclo[18]carbon that is a ring of 18 carbon atoms.
This is about 1013 times less than the diameter of a carbon atom. This gives a possibility of interaction between the waves of visible radiation and a carbon atom which is represented as a drain funnel (the source--reverse funnel--tornado).
For example, C3Si1 represents the carbon as the center atom, and the structure comprises three carbon atoms and one silicon atom.
Indeed, any compound shown by the tetrahedral carbon atom to be asymmetric was in fact optically active when tested, twisting the plane of polarized light in one direction or the other.
The hexaphenylethane tended to break in two and leave him with two single carbon atoms, each with three benzene rings attached-triphenylmethyl.
When polyethylene is chlorinated, there will not be a chlorine atom on every other carbon atom. This chlorinated polyethylene elastomer, CPE, has a degree of chlorination between 25 and 47%.
AFM images reveal only three of the six carbon atoms in each of the material's basic hexagonal units.
However, as carbon atoms are added onto the ever-growing crystal, impurities find their way into the gaps and skew the structure slightly.
Carbon atoms inside fossil fuels are so old that all the radioactive carbon has decayed and only stable atoms remain.
The study also found that Carbyne's strength is even double the strength of grapheme, which is the flat sheet of carbon atoms that is often held up as a "supermaterial."
The Oxford discovery, reported in a paper published in ACS Nano, reveals how the graphene flakes can be lined up by manipulating the alignment of carbon atoms on a relatively cheap copper foil--the atomic structure of the copper surface acts as a "guide" that controls the orientation of the carbon atoms growing on top of them.