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Topic: Odd molecule

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	Interactive Fly, Drosophila
		The Odd pair-rule expression stripes reside in the even-numbered parasegments (corresponding to the odd-numbered segments).
		The Odd pair-rule stripes arise during cellularization in a highly dynamic manner; the proper expression of these stripes is critical for activation of the even-numbered En stripes.
		Odd protein remains in the posterior of the Ftz stripe, resulting in a phase-shift between the anterior margins of Ftz and Odd.
	www.sdbonline.org /fly/segment/odd-skip.htm (5465 words)

	Mass Spectrometry
		In order to measure the characteristics of individual molecules, a mass spectrometer converts them to ions so that they can be moved about and manipulated by external electric and magnetic fields.
		Since molecules of bromine have only two atoms, the spectrum on the left will come as a surprise if a single atomic mass of 80 amu is assumed for Br.
		The presence of chlorine or bromine in a molecule or ion is easily detected by noticing the intensity ratios of ions differing by 2 amu.
	www.cem.msu.edu /~reusch/VirtualText/Spectrpy/MassSpec/masspec1.htm (2839 words)

	The Flynn Group -- STM Images (Site not responding. Last check: 2007-11-03)
		Four molecules have been arranged to show the "up-and-down" profile described in the text.
		Numbers 1-11 refer to the positions of 11 hydrogen on the 11 methylene carbons of a single molecule, and Br refers to the position of the Br atom.
		One molecule length is indicated by a fl bar.
	www.columbia.edu /cu/chemistry/groups/flynn/odd.html (283 words)

	New Page 0
		As explained later, all chemical species having an odd number of electrons are free radicals, but there are chemical species that have an even number of electrons that are also free radicals, although they rarely encountered in biochemistry.
		The reason that the simple definition given earlier is accurate is that all atoms and molecules that have an odd number of electrons must have at least one electron that is in an orbital by itself.
		All chemical species with an odd number of electrons are free radicals, but there are some free radicals that have an even number of electrons, but generally speaking, those exceptions are not the free radicals generally dealt with in biochemistry.
	www.drpasswater.com /Selenium_Research/free_radicals.htm (1731 words)

	Speaking of Radicals Part II: Reactive Oxygen Species
		The oxygen molecule does not have an odd number of electrons, but it does have two "lone" electrons in separate orbitals and can be thought of as being two "odd" electrons.
		As we just discussed, the oxygen molecule is a di-radical, and thus it should be written as O2.., with the two dots representing lone non-paired electrons.
		When SOD adds an electron to the other superoxide molecule, it goes from 02.- to 02= and we no longer have a dot because we have pairs of electrons and 02= would pick up two protons and become hydrogen peroxide, which itself could be a damaging species in biology.
	www.drpasswater.com /nutrition_library/pryor_part_2.html (1666 words)

	Chapter 5 Section 3 (Site not responding. Last check: 2007-11-03)
		In the case of oxygen molecules, the bond is quite strong (e.g., the tennis balls are joined with Krazy glue).
		Despite the large number of molecules present in them, the lowest layers again absorb few photons, but this time it is because there are not many photons left to absorb: only 1 photon penetrates all of the way to the lowest level.
		Another way of thinking about the lifetime of a molecule is to view it as the average amount of time the molecule spends in the atmosphere before it either chemically reacts with another molecule or is broken down by sunlight (photolysis).
	www.ccpo.odu.edu /SEES/ozone/class/Chap_5/5_3.htm (2434 words)

	Lines Of Molecular Oxygen (Site not responding. Last check: 2007-11-03)
		Molecular oxygen, like molecular hydrogen, is a diatomic molecule formed from two identical atoms in most cases since one isotope dominates the mass spectrum of the atom.
		Second even if the molecule had a dipole moment the symmetry requirements involved [due the two nuclei being identical and needing to have antisymmetric wavefunctions, because the proton is a Fermion and so the two protons cannot have exactly the same state] cause half the rotational levels to be forbidden.
		For oxygen the nuclear spin is 0, so rather than having ortho- and para- forms of the molecule there is no para-oxygen (the antisymmetric form, odd J values when the electronic ground state is antisymmetric) because the overall wavefunction must be symmetric when the nuclei are bosons.
	www.iras.ucalgary.ca /~volk/oxygen.html (474 words)

	CHM 1383/3596 Answers to Practice Final Exam
		This leads to energy levels with increasingly closer spacings in real molecules, in contrast to the equal spacings of the HO energy levels.
		The number of normal modes is given by the total number of degrees of freedom for motion of the atoms minus the number of degrees of freedom for translation and rotation of the molecule as a whole.
		There are 3 degrees of freedom for molecular translation, 2 for rotation of linear molecules, and 3 for rotation of nonlinear molecules.
	www.chem.neu.edu /Courses/1383Budil/FinalAnswers.htm (402 words)

	ChemTeam: G.N. Lewis & The Covalent Bond
		This increase in the polar character of a molecule when combined with, or in the neighborhood of, other polar molecules is to a remarkable degree cumulative, for when two molecules by their approach or combination become more polar they draw other molecules more strongly towards them, but this still further increases their polar character.
		Molecules of this class which contain an odd or unpaired electron will for the sake of brevity be called odd molecules.
		Thus between the perfectly symmetrical and nonpolar molecule C and the completely polar and ionized molecule represented by A there will be an infinity of positions representing a greater or lesser degree of polarity.
	dbhs.wvusd.k12.ca.us /webdocs/Chem-History/Lewis-1916/Lewis-1916.html (6968 words)

	Intro to Mass Spectrometry
		Upon entering the mass spectrometer in the gas phase, the molecules are commonly ionized by either removing an electron or by adding a proton.
		Predicting which electron is actually removed from the molecule is often difficult, but it is usually an electron in one of the higher energy occupied molecular or atomic orbitals.
		With molecules bearing a heteroatom such as nitrogen or oxygen the electron usually comes from a non-bonding atomic orbital on the heteroatom.
	orgchem.colorado.edu /hndbksupport/ms/ionsource.html (422 words)

	Molecules with Silly or Unusual Names (Site not responding. Last check: 2007-11-03)
		Also, the related molecule phosphole (which just replaces As with P) is quite amusing if you are a French speaker, since it's pronounced the same as 'fausse folle' (literally false woman), which means both a 'crazy woman' and a 'drag-queen' or 'ladyboy'.
		Although the molecule is a poisonous solid, as flesh decays the vapour pressure of the putrescine it contains becomes sufficiently large to allow its disgusting odour to be detected.
		This molecule is often pronounced with a silent 'th' for comic effect.
	www.chm.bris.ac.uk /sillymolecules/sillymols.htm (5734 words)

	Electron Impact (Site not responding. Last check: 2007-11-03)
		Sample molecules in vapor state are bombarded by fast moving electrons, conventionally 70 eV energy.
		Odd electron fragment ions are formed by direct cleavage(e.g.
		If their observed mass to charge ratio is odd, the molecule under investigation contains odd number of nitrogen atoms.
	www.public.iastate.edu /~kamel/ei.html (243 words)

	Odd molecule (Site not responding. Last check: 2007-11-03)
		On a more pleasant note, the molecule for March of 2005, Hexenal, is the key aroma substance emitted when grass is cut.
		On and on it went, crazy and odd...
		Chlorine dioxide is an example, being a reddish-yellow gas.
	publicliterature.org /en/wikipedia/o/od/odd_molecule.html (151 words)

	‘Rule-breaking’ molecule could lead to non-metal magnets
		The compound is not the only molecule that exhibits such odd behavior in its surrounding cloud of electrons, but it is the first to be discovered that does not include a transition metal.
		Radical molecules, which contain unpaired electrons and are thus more reactive than molecules without them, have gained household notoriety primarily because so-called "free radicals" in the bloodstream can damage healthy cells.
		While the molecule Wenthold’s team has investigated is not found in the body and has no household name – it is referred to only by its chemical description, 5-dehydro-1,3-quinodimethane – it has a property that would raise the eyebrows of any observant student in a first-year chemistry course.
	news.uns.purdue.edu /UNS/html4ever/2004/040202.Wenthold.molecule.html (927 words)

	Negative Vibes From Space
		Astronomers have discovered the first negatively charged molecule in space, identifying it from radio signals that were a mystery until now.
		While about 130 neutral and 14 positively charged molecules are known to exist in interstellar space, this is the first negative molecule, or anion, to be found.
		Such molecules were thought to be extremely rare because ultraviolet light that suffuses space easily knocks electrons off molecules.
	physorg.com /news84199442.html (991 words)

	Axelrod Lab - Research
		A set of interesting molecule is enriched specifically in the groove cells: the actin binding molecule enabled, the apical factors crumbs and the atypical protein kinase C. For many years the morphogen model prevailed to explain how the shape of organs is determined.
		A morphogen is a secreted molecule with an instructive capacity that determines cell fate depending on its concentration.
		Above: In embryos were the signaling molecule hedgehog is over-expressed in the engrailed cells we can find more groove cells.
	www.stanford.edu /group/axelrodlab/groove.shtml (407 words)

	Intro to Mass Spectrometry (Site not responding. Last check: 2007-11-03)
		Consistent with the nitrogen rule, a correct molecular formula for a molecule with an odd molecular mass in the nearest integer value will have the sum of the number of hydrogens plus halides as an odd number.
		Correspondingly, a correct molecular formula for a molecule with an even molecular mass will have the sum of the number of hydrogens plus halides as an even number.
		The molecular ion for aminoethane (ethylamine), [CH, is m/z=45 amu, an odd number; the number of hydrogens is five, also an odd number.
	orgchem.colorado.edu /hndbksupport/ms/nitrogenrule.html (190 words)

	Ion Parity (Site not responding. Last check: 2007-11-03)
		Molecules or ions with an odd number of electrons are called radicals.
		However, the loss of a stable neutral molecule is also a common feature of fragmentation of ions.
		For an odd number of nitrogens the rules are reversed.
	www.colby.edu /chemistry/PChem/ionparity.html (281 words)

	Molecular computer DNA input
		The input string is encoded in a DNA molecule by deliberate placing side-by-side of pre-designed stretches of five nucleotides long, interrupted by spaces three nucleotides long.
		The initial state and the intermediate states are encoded by a modification of the leftmost symbol of an input string: The double-stranded piece of DNA encoding a symbol is cleaved and becomes partially single-stranded.
		The complete encoding of a configuration in a molecule is formed by placing a modified leftmost input symbol followed by double-stranded stretches representing the remaining symbols.
	www.weizmann.ac.il /mathusers/lbn/new_pages/new_pages/pnas.html (858 words)

	Odd Info
		A molecule so big you can see it: The paint is very tough on modern automobiles because scientists have come up with a way of fusing the molecules of the paint together, called cross-linking.
		If you took a glass of iced tea and magnified it until it was as large as the whole earth, each molecule of water would be about the size of a baseball.
		If you were to make a pile of 10,000 average-size molecules, you could just barely see it as a tiny speck.
	members.aol.com /oddwonder/science.htm (1983 words)

	BioCarta - Charting Pathways of Life
		Fatty acids that enter beta-oxidation with an even number of carbons are converted entirely to acetyl-CoA, with the last round producing two acetyl-CoA molecules from one four carbon fatty acid.
		Fatty acids that have an odd number of carbons present a special challenge.
		The rearrangement of this molecule, first between two stereoisomers, and then two structural isomers, results in succinyl-CoA.
	www.biocarta.com /pathfiles/oddnumberchainPathway.asp (228 words)

	Group Theory
		At its heart is the fact that the Set of Operations associated with the Symmetry Elements of a molecule constitute a mathematical set called a Group.
		Each of these Symmetry Operations is associated with a Symmetry Element which is a point, a line, or a plane about which the operation is performed such that the molecule's orientation and position before and after the operation are indistinguishable.
		The possible Symmetry Operations associated with a molecule are determined by the Symmetry Elements possessed by that molecule.
	www.science.siu.edu /chemistry/tyrrell/group_theory/sym1.html (487 words)

	The Net Equation: Your Online Source for Chemistry Solutions
		In simple molecules, there is a rule that the atom that appears once is the central atom, so we'll draw CO like this:
		An other interesting configuration of electrons can result when the total number of valence electrons in a molecule is odd.
		Molecules with one unpaired electron are called free radicals, and they are very reactive, because they either want to get rid of or find an extra electron.
	library.thinkquest.org /C004970/atoms/lewis.htm (882 words)

	Rules for Lewis Structures (Site not responding. Last check: 2007-11-03)
		The molecule has an odd number of electrons, which results in one of the central atoms having only 7 electrons.
		the number of electrons in the molecule is odd and the central atom has fewer than 7 electrons.
		These are resonance structures: the molecule actually resembles an average of all of the structures rather than any single one.
	chemistry.umeche.maine.edu /CHY251/therules.html (1008 words)

	UW-Madison Arboretum: News: States of Water, States of Mind
		Another odd property water has is that its solid form is less dense than its liquid form.
		The water molecule ends up with slight positive charges around the Hydrogens and a slight negative charge around the Oxygen (take a deep breath I’m almost done with the pure science stuff).
		The molecules in liquid water move around with enough energy to constantly break and reform the Hydrogen “attractions.” As water cools, the molecules do get closer together.
	uwarboretum.org /news/singlePost.php?id=139&origin=news (1333 words)

	Protein folding and disease
		The dichotomy is whether a protease participated covalently during catalysis (Ser, Cys or Thr proteases), or polarizes a water molecule to accomplish catalysis (Asp or metalloproteinases).
		Perhaps the RIP proteases create their own water channel, or perhaps RIP is so catalytically slow that the odd water molecule finds its way in.
		As such fundamental housekeeping structures, it is entirely puzzling how a proteasome-directed small molecule could be of help in diminishing cancer.
	www.nature.com /horizon/proteases/summary.html (5202 words)

	NBS Monograph 115 - 1.4 Nonrotating-Molecule Basis Set
		for the nonrotating molecule are not considered in detail in calculations of rotational energy levels.
		When spin orbit interaction is not large, i.e., when the energy levels of the nonrotating molecule do fall into recognizable multiplet groups, then the wave functions for the nonrotating molecule are normally characterized by three almost good quantum numbers, namely: the value
		When spin-orbit interaction is not large, and when electrostatic interactions between the electrons and the axial field of the diatomic molecule [1] (pp.
	physics.nist.gov /Pubs/Mono115/chap1.04.html (913 words)

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