Chemical reaction
hideA chemical reaction is a process that always results in the interconversion of chemical substances. The substance or substances initially involved in a chemical reaction are called reactants. Chemical reactions are usually characterized by a chemical change, and they yield one or more products, which usually have properties different from the reactants. Classically, chemical reactions encompass changes that strictly involve the motion of electrons in the forming and breaking of chemical bonds, although the general concept of a chemical reaction, in particular the notion of a chemical equation, is applicable to transformations of elementary particles, as well as nuclear reactions. Different chemical reactions are used in combination in chemical synthesis in order to get a desired product. In biochemistry, series of chemical reactions catalyzed by enzymes form metabolic pathways, by which syntheses and decompositions ordinarily impossible in conditions within a cell are performed.
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News tagged with chemical
H1N1 Virus Can Be Killed by Acidic Ozone Water
Nov 09, 2009 |
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(PhysOrg.com) -- Scientists have found that acidic ozone water can deactivate H1N1 viruses very effectively, offering a promising disinfectant for the millions of people trying to avoid the disease. Acidic ...
Porphyrin Dimers Increase Efficiency of Dye-Sensitized Solar Cells
Oct 30, 2009 |
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(PhysOrg.com) -- Porphyrins are most commonly thought of as the pigment in red blood cells, but now scientists have found that porphyrins can also be used to increase the efficiency of an inexpensive type ...
Scientists Build Nanostructures out of Single DNA Strands
Nanotechnology / Bio & Medicine
Sep 08, 2009 |
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(PhysOrg.com) -- With its unique double-helical structure, DNA has the ability to be used as a programmable building material to construct designer nanoscale architectures. Complex DNA architectures could ...
Fine-tuned: A wholly new approach to tuning a laser's frequency
Dec 04, 2009 |
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(PhysOrg.com) -- For more than 30 years, scientists have been trying to harness the power of terahertz radiation. Tucked between microwaves and infrared rays on the electromagnetic spectrum, terahertz rays ...
Nanoparticles used in common household items caused genetic damage in mice
Nanotechnology / Bio & Medicine
Nov 16, 2009 |
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Titanium dioxide (TiO2) nanoparticles, found in everything from cosmetics to sunscreen to paint to vitamins, caused systemic genetic damage in mice, according to a comprehensive study conducted by researchers at UCLA's Jonsson ...
Accidental discovery produces durable new blue pigment for multiple applications
Nov 16, 2009 |
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An accidental discovery in a laboratory at Oregon State University has apparently solved a quest that over thousands of years has absorbed the energies of ancient Egyptians, the Han dynasty in China, Mayan ...
Dopamine enhances expectation of pleasure in humans
Medicine & Health / Neuroscience
Nov 12, 2009 |
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(PhysOrg.com) -- Enhancing the effects of the brain chemical dopamine influences how people make life choices by affecting expectations of pleasure, according to new research from the UCL Institute of Neurology.
Vibrations key to efficiency of green fluorescent protein
Nov 11, 2009 |
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University of California, Berkeley, chemists have discovered the secret to the success of a jellyfish protein whose green glow has made it the darling of biologists and the subject of the 2008 Nobel Prize ...
Earth's early ocean cooled more than a billion years earlier than thought (w/ Video)
Space & Earth / Earth Sciences
Nov 11, 2009 |
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(PhysOrg.com) -- The scalding-hot sea that supposedly covered the early Earth may in fact never have existed, according to a new study by Stanford University researchers who analyzed isotope ratios in 3.4 ...
Exoplanets Clue to Sun's Curious Chemistry
Nov 11, 2009 |
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(PhysOrg.com) -- A ground-breaking census of 500 stars, 70 of which are known to host planets, has successfully linked the long-standing "lithium mystery" observed in the Sun to the presence of planetary systems. ...
New transparent insulating film could enable energy-efficient displays
Nanotechnology / Nanomaterials
Nov 09, 2009 |
4.9 / 5 (8) |
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Johns Hopkins materials scientists have found a new use for a chemical compound that has traditionally been viewed as an electrical conductor, a substance that allows electricity to flow through it. By orienting ...
How Size Matters For Catalysts: Study Links Size, Activity, Electronic Properties
Nanotechnology / Nanomaterials
Nov 05, 2009 |
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(PhysOrg.com) -- University of Utah chemists demonstrated the first conclusive link between the size of catalyst particles on a solid surface, their electronic properties and their ability to speed chemical ...
'Fear detector' being developed
Nov 03, 2009 |
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(PhysOrg.com) -- British scientists are aiming to develop a device that can detect the smell of fear, and that could one day identify terrorists, drug smugglers, and other criminals.
Magnetic mixing creates quite a stir (w/ Video)
Oct 27, 2009 |
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Sandia researchers have developed a process that can mix tiny volumes of liquid, even in complicated spaces.
Researchers identify dominant chemical that attracts mosquitoes to humans
Oct 26, 2009 |
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Scientists at the University of California, Davis, have identified the dominant odor naturally produced in humans and birds that attracts the blood-feeding Culex mosquitoes, which transmit West Nile virus ...
