Ice rink fumes have sent kids to the hospital: Few states require tests
Last December, dozens of young hockey players were rushed to hospitals in the Buffalo, New York, area—some vomiting, lethargic and suffering from headaches.
Aug 8, 2024
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Last December, dozens of young hockey players were rushed to hospitals in the Buffalo, New York, area—some vomiting, lethargic and suffering from headaches.
Aug 8, 2024
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Similar to other sectors around the world, the light speed development of artificial intelligence (AI) has made its way into health care, particularly the radiology field. As such, AI-based diagnostic systems are flourishing, ...
Aug 2, 2024
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We now have a dizzying array of heating technologies to consider, besides the fire that warmed our ancestors.
Aug 1, 2024
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Elite free divers can hold their breath for 10 minutes after years of rigorous, sometimes dangerous training. Northern elephant seals practically live underwater, taking up to 90 minutes between breaths.
Jul 31, 2024
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It's Monday morning, the alarm goes off and it's already 7:30 a.m.—and you're 30 minutes late. Normally you need 45 minutes to walk the 3 kilometers to work, but this morning you'll be running for 20 minutes. Yes, but by ...
Jul 5, 2024
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Artificial ventilation can save lives, but it also puts pressure on lung tissue. If the lungs are pre-damaged, pressurized ventilation can even have undesirable effects. This is especially true of patients with acute respiratory ...
Jul 2, 2024
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A new trial conducted by the University of Oxford reveals that sildenafil, commonly known as Viagra, enhances blood flow to the brain and improves the function of brain blood vessels in patients at a heightened risk of vascular ...
Jun 7, 2024
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Changing how often a popular cancer therapy is delivered would reduce greenhouse gas emissions and improve environmental impact without decreasing cancer survival, according to a new analysis from researchers at the University ...
May 29, 2024
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The ParticipACTION Report Card on Physical Activity for Children and Youth, the most comprehensive assessment of children's physical activity in Canada, recently gave the country a D+ in overall physical activity.
May 16, 2024
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A study led by Canadian researchers sheds new light on how to approach decreasing the carbon footprint of our health care system by thinking critically about end-of-life care.
May 9, 2024
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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.
This text uses material from Wikipedia, licensed under CC BY-SA