News tagged with carbon
Air pollutants from traffic are associated with increased asthma severity levels in pregnant asthmatic women, according to a new study.
Health May 20, 2013 | not rated yet | 0
Measuring enzyme levels in cancer patients may reveal healthy cells' ability to survive chemotherapy
New research from MIT may allow scientists to develop a test that can predict the severity of side effects of some common chemotherapy agents in individual patients, allowing doctors to tailor treatments ...
Genetics Apr 05, 2013 | not rated yet | 0 |
One of the major obstacles to growing new organs—replacement hearts, lungs and kidneys—is the difficulty researchers face in building blood vessels that keep the tissues alive, but new findings from the ...
Medical research Apr 04, 2013 | 5 / 5 (2) | 0 |
(Medical Xpress)—Breathing traffic pollution in early pregnancy is linked to a higher risk for certain serious birth defects, according to new research from the Stanford University School of Medicine.
Health Mar 29, 2013 | not rated yet | 0 |
There may be different opinions about the causes of climate change, but experts say there is no denying its existence—and the effects are nothing to sneeze at. Researchers say global warming is leading to larger plants, ...
Immunology Mar 25, 2013 | not rated yet | 0
Researchers from The Miriam Hospital and the Rhode Island Community Food Bank report individuals who participated in a six-week cooking program and followed simple, plant-based recipes decreased their total food spending, ...
Health Mar 20, 2013 | 5 / 5 (3) | 0
(Medical Xpress)—Results from a clinical trial into amyotrophic lateral sclerosis (ALS), led by King's College London's Institute of Psychiatry show that lithium carbonate is ineffective at treating the ...
Neuroscience Mar 19, 2013 | 5 / 5 (2) | 1 |
Notorious among athletes and trainers as career killers, Achilles tendon injuries are among the most devastating. Now, by carbon testing tissues exposed to nuclear fallout in post WWII tests, scientists have learned why: ...
Medical research Feb 12, 2013 | not rated yet | 1 |
(Medical Xpress)—Researchers at the University of Iowa have found that three volunteer women with defective amygdalas were able to experience internal fear. In their paper published in the journal Nature Ne ...
Neuroscience Feb 04, 2013 | 5 / 5 (1) | 2 |
Scientists at the University of Birmingham have devised a unique screening instrument that provides a 'one-stop' brain function profile of patients who have suffered stroke or other neurological damage.
Neuroscience Jan 17, 2013 | not rated yet | 0
In their quest for new agents, pharmaceutical researchers test millions of substances all over the world. They like using color-forming reactions to identify new molecules. However, in intensively colored ...
Cancer Dec 20, 2012 | not rated yet | 0 |
BOSTON—When people with a family history of colorectal cancer develop the disease, their tumors often carry a molecular sign that the cancer could be life-threatening and may require aggressive treatment, Dana-Farber Cancer ...
Cancer Dec 12, 2012 | not rated yet | 0
Taxes on soft drinks and foods high in saturated fats and subsidies for fruit and vegetables could lead to beneficial dietary changes and potentially improve health, according to a study by experts from New Zealand published ...
Health Dec 11, 2012 | not rated yet | 0
(Medical Xpress)—The Pain Research Group at the UA College of Medicine-Tucson studies the underlying causes of acute and chronic pain to promote the discovery of new targets for drug development with the ultimate goal of ...
Medical research Nov 27, 2012 | 5 / 5 (1) | 0 |
(HealthDay)—It might be a good idea to take stock of the heartburn products in your medicine cabinet before heading out to any holiday parties, an expert advises.
Health Nov 22, 2012 | not rated yet | 0
Carbon (pronounced /ˈkɑrbən/) is the chemical element with symbol C and atomic number 6. As a member of group 14 on the periodic table, it is nonmetallic and tetravalent—making four electrons available to form covalent chemical bonds. There are three naturally occurring isotopes, with 12C and 13C being stable, while 14C is radioactive, decaying with a half-life of about 5730 years. Carbon is one of the few elements known since antiquity. The name "carbon" comes from Latin language carbo, coal, and, in some Romance and Slavic languages, the word carbon can refer both to the element and to coal.
There are several allotropes of carbon of which the best known are graphite, diamond, and amorphous carbon. The physical properties of carbon vary widely with the allotropic form. For example, diamond is highly transparent, while graphite is opaque and black. Diamond is among the hardest materials known, while graphite is soft enough to form a streak on paper (hence its name, from the Greek word "to write"). Diamond has a very low electrical conductivity, while graphite is a very good conductor. Under normal conditions, diamond has the highest thermal conductivity of all known materials. All the allotropic forms are solids under normal conditions but graphite is the most thermodynamically stable.
All forms of carbon are highly stable, requiring high temperature to react even with oxygen. The most common oxidation state of carbon in inorganic compounds is +4, while +2 is found in carbon monoxide and other transition metal carbonyl complexes. The largest sources of inorganic carbon are limestones, dolomites and carbon dioxide, but significant quantities occur in organic deposits of coal, peat, oil and methane clathrates. Carbon forms more compounds than any other element, with almost ten million pure organic compounds described to date, which in turn are a tiny fraction of such compounds that are theoretically possible under standard conditions.
Carbon is one of the least abundant elements in the Earth's crust, but the fourth most abundant element in the universe by mass after hydrogen, helium, and oxygen. It is present in all known lifeforms, and in the human body carbon is the second most abundant element by mass (about 18.5%) after oxygen. This abundance, together with the unique diversity of organic compounds and their unusual polymer-forming ability at the temperatures commonly encountered on Earth, make this element the chemical basis of all known life.
For more information about Carbon, read the full article at
This text uses material from Wikipedia and is available under the GNU Free Documentation License.