News tagged with molecules
Turning DNA into a hard drive
Silicon-based computers are fine for typing term papers and surfing the Web, but scientists want to make devices that can work on a far smaller scale, recording data within individual cells. One way to do that is to create ...
22 hours ago |
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Nanoscale protein containers could aid drug, vaccine delivery
UCLA biochemists have designed specialized proteins that assemble themselves to form tiny molecular cages hundreds of times smaller than a single cell. The creation of these miniature structures may be the ...
Nanotechnology / Bio & Medicine
May 31, 2012 |
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SLAC X-ray laser used to probe biomolecules to individual atoms
An international team led by SLAC National Accelerator Laboratory has proved how the world's most powerful X-ray laser can assist in cracking the structures of biomolecules, and in the processes helped to ...
May 31, 2012 |
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Silkmoth inspires novel explosive detector
Imitating the antennas of the silkmoth, Bombyx mori, to design a system for detecting explosives with unparalleled performance is the feat achieved by a French research team. Made up of a silicon microcantilever ...
Chemistry / Analytical Chemistry
Jun 01, 2012 |
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Study maps vaccine for deadly pathogenic fungus
University of Alberta researchers have made breakthrough use of 3-D magnetic resonance technology to map the structure of a common fungus that is potentially deadly for individuals with impaired immune function. The work ...
May 31, 2012 |
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Scientists develop ultra-sensitive test that detects diseases in their earliest stages
Scientists have developed an ultra-sensitive test that should enable them to detect signs of a disease in its earliest stages, in research published today in the journal Nature Materials.
Chemistry / Analytical Chemistry
May 27, 2012 |
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DNA strands create tiniest Smileys
Harvard University scientists on Wednesday said they had created Smileys, Chinese characters and card-game symbols at scales of billionths of a metre using strands of DNA.
Nanotechnology / Bio & Medicine
May 30, 2012 |
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Advancing quantum computing
European researchers have made important advances in understanding the major stumbling block to realisation of quantum computers, a phenomenon known as decoherence.
May 30, 2012 |
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Meteorite hunt goes on, needs public's help
(Phys.org) -- A University of California, Davis, geologist is appealing for public help in tracking down pieces of the meteorite that blew up over El Dorado County on April 22.
Space & Earth / Space Exploration
May 28, 2012 |
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Understanding patterns of dew formation
Researchers have delved into the dynamics of vapour condensation on surfaces. Project outcomes have potential commercial applications to a variety of fields.
May 30, 2012 |
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Molecule
A molecule is defined as a sufficiently stable, electrically neutral group of at least two atoms in a definite arrangement held together by very strong (covalent) chemical bonds. Molecules are distinguished from polyatomic ions in this strict sense. In organic chemistry and biochemistry, the term molecule is used less strictly and also is applied to charged organic molecules and biomolecules.
In the kinetic theory of gases the term molecule is often used for any gaseous particle regardless of its composition. According to this definition noble gas atoms are considered molecules despite the fact that they are composed of a single non-bonded atom.
A molecule may consist of atoms of a single chemical element, as with oxygen (O2), or of different elements, as with water (H2O). Atoms and complexes connected by non-covalent bonds such as hydrogen bonds or ionic bonds are generally not considered single molecules.
No typical molecule can be defined for ionic crystals (salts) and covalent crystals (network solids), although these are often composed of repeating unit cells that extend either in a plane (such as in graphene) or three-dimensionally (such as in diamond or sodium chloride). The theme of repeated unit-cellular-structure also holds for most condensed phases with metallic bonding. In glasses (solids that exist in a vitreous disordered state), atoms may also be held together by chemical bonds without any definable molecule, but also without any of the regularity of repeating units that characterises crystals.
For more information about Molecule, read the full article at
Wikipedia.
This text uses material from Wikipedia and is available under the GNU Free Documentation License.
