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Topic: Molecule


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In the News (Fri 15 Dec 17)

  
  Water molecule structure
The molecule is clearly not spherical, however, with about a ±5% variation in van der Waals diameter dependent on the axis chosen; approximately tetrahedrally placed slight indentations being apparent opposite the (putative) electron pairs.
Simplified models for the water molecule have been developed to agree with particular physical properties (for example, agreement with the critical parameters) but they are not robust and resultant data are often very sensitive to the precise model parameters [206].
Water molecules each possess a strongly nucleophilic oxygen atom that enables many of life‘s reactions, as well as ionizing to produce reactive hydrogen and hydroxide ions.
www.lsbu.ac.uk /water/molecule.html   (1773 words)

  
  Molecule - MSN Encarta
For a molecule with four atoms, the central atom lies in the middle of a triangle formed by the three surrounding atoms.
In a water molecule, the central oxygen atom bonds to two surrounding hydrogen atoms and is left with one nonbonding pair in its valence shell.
Instead of forming a straight line, the water molecule follows the pattern for a molecule with four atoms, with a central atom in the middle of a triangle formed by the surrounding atoms.
encarta.msn.com /encyclopedia_761563983/Molecule.html   (2859 words)

  
  Molecule - Wikipedia, the free encyclopedia
Generally, a molecule is the smallest particle of a pure chemical substance that still retains its composition and chemical properties.
a single-atom molecule as found in noble gases, is used almost exclusively in the kinetic theory of gases, where the fundamental gas particles are conventionally termed "molecules" regardless of their composition.
The term unstable molecule is used for very reactive species, i.e., short-lived assemblies (resonances) of electrons and nuclei, such as radicals, molecular ions, Rydberg molecules, transition states, Van der Waals complexes, or systems of colliding atoms as in Bose-Einstein condensates.
www.wikipedia.org /wiki/Molecule   (890 words)

  
 molecule. The Columbia Encyclopedia, Sixth Edition. 2001-05
Molecules are made up of two or more atoms, either of the same element or of two or more different elements, joined by one or more covalent chemical bonds.
According to the kinetic-molecular theory, the molecules of a substance are in constant motion.
An assumption that there are two atoms in a molecule of gaseous hydrogen or chlorine and one atom each of hydrogen and chlorine in a molecule of hydrogen chloride preserves both the hypothesis of indivisible atoms and the hypothesis of equal numbers of particles in equal volumes of gases.
www.bartleby.com /65/mo/molecule.html   (992 words)

  
 Molecule | World of Biology
A molecule is defined as the smallest particle of an element or a compound that possesses the properties of the original substance.
Molecules vary in size from less than 1 millimicron to more than 500 millimicrons and in weight from 4 units (for helium) to 40 million units (for the tobacco mosaic virus).
In certain cases, atoms within a molecule may be arranged in different configurations to form molecules which contain the same number and same type of atoms, but which have different properties because of their spacial arrangement.
www.bookrags.com /research/molecule-wob   (463 words)

  
 molecule - HighBeam Encyclopedia   (Site not responding. Last check: )
MOLECULE [molecule] [New Lat.,=little mass], smallest particle of a compound that has all the chemical properties of that compound.
Molecules are made up of two or more atoms, either of the same element or of two or more different elements, joined by one or more covalent chemical bonds.
An assumption that there are two atoms in a molecule of gaseous hydrogen or chlorine and one atom each of hydrogen and chlorine in a molecule of hydrogen chloride preserves both the hypothesis of indivisible atoms and the hypothesis of equal numbers of particles in equal volumes of gases.
www.encyclopedia.com /html/m1/molecule.asp   (1139 words)

  
 Molecule   (Site not responding. Last check: )
A molecule is the smallest portion of a pure element or compound that retains a set of unique chemical and physical properties.
A molecule usually consists of two or more atom s bonded together, with the exception of noble gas es which are composed of single atom molecules.
A property of molecules is the integer ratio of the element s that constitute the compound, the empirical formula.
www.serebella.com /encyclopedia/article-Molecule.html   (778 words)

  
 Molecule - nCyclopedia
A molecule is the smallest particle of a pure chemical substance that still retains its chemical composition and properties.
Abstractly, a single atom may be considered a molecule, as it is when referred to collectively with molecules of multiple atoms, but in practice the use of the word molecule is usually confined to chemical compounds, of multiple atoms.
Molecules have fixed equilibrium geometries—bond lengths and angles—that are dictated by the laws of quantum mechanics.
nanotitan.com /nCyclopedia/molecule.htm   (362 words)

  
 Columbia Encyclopedia- molecule - AOL Research & Learn
Molecules of hydrogen gas, H2, are very small; each consists of two atoms of hydrogen.
A carbon dioxide molecule, CO2, is linear, with the two oxygen atoms an equal distance on either side of the carbon atom.
In methane, CH4, the hydrogen atoms are arranged at the corners of a tetrahedron with the carbon atom in the center.
reference.aol.com /columbia/_a/molecule/20051206221609990021   (988 words)

  
 molecule - Search Results - MSN Encarta
Molecule, smallest particle of a substance having the specific chemical properties of that substance.
Polar Molecule, neutral molecule in which there is an unsymmetrical distribution of charge, so that one end of the molecule has a partial positive...
The haemoglobin molecule’s 10,000 atoms are assembled into four chains, each a helix with several bends.
uk.encarta.msn.com /molecule.html   (131 words)

  
 The Mystery Molecule Page
This molecule was at the center of one of the cases heard by the Supreme Court this year.
The molecule responsible for the smell of nutmeg is supposed to have repelled the fleas that carried bubonic plague.
This molecule occurs naturally in some plants and is available in non-prescription diet aids, one of which was implicated in the recent death of a young baseball player during spring training.
www.aacc.org /AACC/members/loc_sections/ncalifornia/molecule.htm   (3738 words)

  
 interstellar molecule Comparison Table   (Site not responding. Last check: )
A molecule consisting of one carbon atom and one oxygen atom.
It is the most abundant interstellar molecule after molecular hydrogen and is especially useful because it radiates at radio wavelengths, so astronomers can use it to map the distribution of molecular hydrogen.
A molecule discovered in interstellar apace in 1974, in Sgr B2, at a frequency of 87.77 GHz.
www.site.uottawa.ca:4321 /astronomy/interstellarmolecule_table.html   (301 words)

  
 Key molecule helps identify renal cell carcinoma
Patients with renal cell carcinoma who have higher levels of a molecule known as B7-H1 in their tumors are nearly five times more likely to die from the disease than patients with low levels or an absence of the molecule.
They found that when patients express this molecule on their kidney cancer cells, they are at markedly increased risk both of the cancer spreading, and of dying from the cancer.
This molecule seems suited to be used as a biomarker by physicians to determine prognosis, according to the Mayo researchers.
www.news-medical.net /print_article.asp?id=6571   (678 words)

  
 Molecule Pages - Signaling Gateway
The Molecule Pages allow users to explore how proteins interact in complexes or in pathways, with references to the supporting literature.
As we add new reviews, the Molecule Pages database is evolving into a model of an artificial cell representing all signaling molecules and their binding partners.
Tab-delimited files relating the Molecule Pages to protein accession and NCBI Gene ID are availabe for ftp download at ftp://ftp.afcs.org/pub/mpdata/.
www.signaling-gateway.org /molecule   (166 words)

  
 What is the difference between a compound and a molecule?
A molecule is formed when two or more atoms join together chemically.
All compounds are molecules but not all molecules are compounds.
For example, a single molecule of molecular hydrogen is made from two atoms of hydrogen while a single molecule of water is made from two atoms of hydrogen and one atom of oxygen.
education.jlab.org /qa/compound.html   (195 words)

  
 IBM Research | Almaden Research Center | Science and Technology | Molecule Cascades   (Site not responding. Last check: )
Moving a single molecule initiates a cascade of molecule motions, just as toppling a single domino can cause a large pattern to fall in sequence.
The molecule cascade works because carbon monoxide molecules can be arranged on a copper surface in an energetically metastable configuration that can be triggered to cascade into a lower energy configuration, just as with toppling dominoes.
Just as placing three tennis balls in a row of an egg carton is unstable, Heinrich and Lutz learned that a triad of carbon monoxide molecules arranged in a chevron-shaped pattern on the copper surface would spontaneously rearrange by the outward motion of the central molecule.
www.almaden.ibm.com /st/exploratory_technology/mc/index.shtml   (574 words)

  
 Molecule of the Month
If you wish to contribute a Molecule of the Month page, just email me the URL and I'll add you to the list at the next opportunity.
Important natural molecules that resemble hormones and have a range of biological effects.
The poisonous gas that was an important molecule in the history of forensic science.
www.chm.bris.ac.uk /motm/motm.htm   (604 words)

  
 DNA Molecule - Two Views
The double helix of the DNA is shown along with details of how the bases, sugars and phosphates connect to form the structure of the molecule.
DNA is a double-stranded molecule twisted into a helix (think of a spiral staircase).
Each spiraling strand, comprised of a sugar-phosphate backbone and attached bases, is connected to a complementary strand by non-covalent hydrogen bonding between paired bases.
www.accessexcellence.org /RC/VL/GG/dna_molecule.html   (94 words)

  
 molecule - a definition from Whatis.com
A molecule is the smallest particle in a chemical element or compound that has the chemical properties of that element or compound.
Molecules are made up of atoms that are held together by chemical bonds.
In a gas, the density of molecules is generally less than in a liquid or solid of the same chemical compound, and they move even more freely than in a liquid.
whatis.techtarget.com /definition/0,,sid9_gci856651,00.html   (449 words)

  
 BioMed Central | Full text | Domain-based small molecule binding site annotation
While a wealth of information on small molecule binding is available in the PDB and given extensive work on protein family databases [15-17], the tools do not exist to make use of this information and map it to annotation of protein sequences in a consistent and efficient fashion.
Molecules in the summary table are sorted by the final ligand score, which is the average of the initial ligand score for each similar binding site that was merged together to form the summary binding site, multiplied by the binding site occupancy.
For example, a small molecule that is known to bind to a domain in one protein may not bind to the same domain in a different protein.
www.biomedcentral.com /1471-2105/7/152   (9713 words)

  
 Molecule makes electric motor TRN 042104
The molecule contains a pair of rings made from carbon, boron and hydrogen atoms that rotate 144 degrees in opposite directions around a single nickel atom when the nickel atom absorbs light or electricity.
The direction of the motor's rotation depends on the direction of the flow of electrons during the reaction, which, in turn, depends on the number of electrons associated with the nickel atom.
By fixing one ring to a surface and the other to an object, the molecule could be used to rotate the object relative to the surface.
www.trnmag.com /Stories/2004/042104/Molecule_makes_electric_motor_042104.html   (552 words)

  
 HOME :: Molecule™ :: Clean and Protect Nomex® and Other Technical Fabrics
Molecule was recently introduced to some of the world’s top off road racers competing in the 2006 Tecate SCORE Baja 1000.
Molecule hosted live product demonstrations at the UP Racing booth during pre-race festivities, and offered $1,000.00 to the first driver to cross the finish line displaying Molecule decals and wearing a Molecule treated racing suit.
Molecule would like to thank everyone who helped make our debut to the racing industry a wild success: manufacturers, distributors, store owners, teams, drivers, schools, enthusiasts, and the PRI staff which organized and ran the show.
www.moleculelabs.com /index.html   (272 words)

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