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Topic: Methyl group


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In the News (Tue 16 Jul 19)

  
 Methyl group - Wikipedia, the free encyclopedia
In chemistry, a methyl group is a hydrophobic alkyl functional group derived from methane (CH
When a methyl group is substituted as the R group in an amino acid, it forms alanine.
The introduction of methyl groups as new substituents in a compound usually increases the lipophilicity of the compound and reduces its water solubility.
en.wikipedia.org /wiki/Methyl_group   (146 words)

  
 Methyl group Summary
The methyl group is the alkyl group with the chemical formula -CH The methyl group is sometimes abbreviated to -Me. The methyl group is derived from methane, CH The methyl group, along with other alkyl groups is a modifier of the behavior of the functional group of the molecule in which it occurs.
A methyl group has a low molecular mass and as such it has a minimal effect on the properties of other molecules of which it is attached to.
The addition of a methyl group to a compound is known as methylation.
www.bookrags.com /Methyl_group   (360 words)

  
 Methylation Summary
Methylation is generally a silencing mechanism in mammalian cells, inhibiting transcriptional activity from the modified genes, including transposons and retroviruses that have accumulated in the mammalian genome.
The importance of methylation in at least the maintenance of imprints is clear, and the nature of the de novo imprint is a subject of active research.
Methylator phenotype describes a pathway that results in instability through the simultaneous silencing of multiple genes, and is involved with tumors with sporadic mismatch repair deficiency.
www.bookrags.com /Methylation   (3505 words)

  
 Methyl group tunnelling - a quantitative probe of atom-atom interactions
Aswell as being a tool for investigating quantum tunnelling effects, the methyl group is also a sensitive probe of atom-atom interactions since the tunnel frequency depends exponentially on the height of the rotational barrier.
That the correlation is valid in many cases enables the methyl group to be used as a probe of its molecular environment and the numerical methods to be applied to less well characterised systems such as methyl group dynamics in amorphous polymers.
Methyl Group Tunnelling - A Quantitative Probe Of Atom-Atom Potentials,M.
www.ill.fr /mod/mark_web.htm   (694 words)

  
 Wellness Goods :: Health Products :: Gematria :: Landmark Study
A methyl group has a carbon atom in the center, a hydrogen atom at three points of a tetrahedron, and a fourth point free for the attachment to another atom or molecular group.
The dynamics of tetrahedral methyl groups may prove to be at the core of regulating the potential for longevity.
Displacement of methyl groups interferes with regulating DNA functions and preserving the integrity of cells and tissues.
www.wellnessgoods.com /gemlandmarkstudy.asp   (2799 words)

  
 Process for producing a casting plate of polymethyl methacrylate - Patent 4214064
C., 0.65 dl/g) in methyl methacrylate in 15% concentration were dissolved 0.06 part of azobis(2,4-dimethylvaleronitrile) as an initiator, 0.10 part of dilauryl thiodipropionate as a stabilizer and 0.01 part of sodium dioctylsulfosuccinate as a surfactant.
In 100 parts of the methyl methacrylate syrup as used in Example 1 were dissolved azobisisobutyronitrile as an initiator, dilauryl thiodipropionate as a stabilizer and sodium dioctylsulfosuccinate as a surfactant in amounts as indicated in Table 2, and the resulting mixture was deaerated.
The deaerated methyl methacrylate syrup was poured into the continuous casting apparatus, polymerized, heat-treated and cooled to room temperature as in Example 1 to give a continuous casting plate of colorless, transparent and foamless methyl methacrylate polymer.
www.freepatentsonline.com /4214064.html   (2173 words)

  
 Formula to Name
The chloro group in this compound is attached to the first carbon and the methyl group is attached to the second carbon.
In this case the location of the methyl group dictates that the four-carbon chain is numbered from left-to-right.
There is a methyl group attached below the third carbon, an ethyl group also attached to the third carbon, and another methyl group attached to the fourth carbon.
dl.clackamas.cc.or.us /ch106-01/formula.htm   (660 words)

  
 Help-1   (Site not responding. Last check: 2007-11-03)
The carbon indicated is chiral since it is bonded to four different groups; a hydrogen, a methyl group, the 2-phenylethyl group and the CH The carbon indicated is chiral since it is bonded to four different groups; a hydrogen, a chlorine, the propyl group and the CH Br.
The carbon indicated is chiral since it is bonded to four different groups; a hydrogen, a chlorine, the methyl group and the CH Br.
Carbon #3 is likewise bonded to a hydrogen, an ethyl group, a chlorine, and the 1-chloroethyl group.
www.chem.uic.edu /web1/ocol/10-2/10-2h.htm   (480 words)

  
 Structure of Benzene
For this reason the methyl group is called an "ortho-para directing group." It "directs" the incoming electrophile to attack at the ortho and para positions relative to itself.
Groups in which the atom directly attached to the benzene ring have a partial or complete positive charge tend to pull electrons toward themselves.
We understand this to mean that the methyl group lowered the energy of intermediates and transition states along the pathway to product as compared to the effect of a hydrogen (in benzene).
chemistry2.csudh.edu /rpendarvis/ElAromSubst.html   (1495 words)

  
 Enzymes & Methylation
Methylation is simply the adding or removal of the methyl group to a compound or other element.
When the methyl group is "lost" or removed, the reaction stops (or a gene is turned off or the enzyme is deactivated).
Of course, they may not see additional benefit if the methylation process is fixed with the first supplement, but it is something that might help a person know why they or their child is consistently doing well or poorly with a group of supplements.
www.enzymestuff.com /methylation.htm   (6063 words)

  
 [No title]   (Site not responding. Last check: 2007-11-03)
This is the less stable of the two conformations that interconvert by the ring-flipping process because of the steric interactions between the axial methyl group and the axial hydrogens on the same face of the ring (1,3-diaxial interactions).
As a result, a sample of methylcyclohexane is composed 95% of molecules with the methyl group equatorial and 5% of molecules with the methyl group axial.
The axial strain energy for an isopropyl group (2.2 kcal/mol [9.2 kJ/mol]) is only slightly larger than that for a methyl group because the isopropyl group has a hydrogen pointed back over the ring to interact with the axial hydrogens.
www.du.edu /~jhornbac/organic/eqmecyc6.html   (247 words)

  
 Methyl Donors : by Ray Sahelian, M.D., information on methyl donors, TMG, DMG, DMAE, and SAM-e
METHYL by Ray Sahelian, M.D. Unless your major is college was chemistry, chances are you don’t remember learning about methyl donors.
Methyl donors may be helpful in age related cognitive decline, Alzheimer’s disease, fighting depression, and overall health maintenance.
Methyl donors are also involved in the making of brain chemicals which accounts for their cognitive effects.
www.raysahelian.com /methyl.html   (2105 words)

  
 Nomenclature Examples
The location of the methyl group must be specified, since there are two possible isomers of this kind.
Note that if the methyl group were located at the end of the chain, the longest chain would have seven carbons and the root name would be heptane not hexane.
In this case it is the right end of the chain, and the methyl group is located on carbon #3.
www.cem.msu.edu /~reusch/VirtualText/nomexmp1.htm   (1823 words)

  
 Self-adhesive silicone compositions - Patent 5384384   (Site not responding. Last check: 2007-11-03)
The composition of claim 1, wherein, in the organic silicon compound (B), R.sup.2 is alkyl of 1 to 10 carbon atoms or phenyl group, wherein the hydrogen atoms on the groups for R.sup.2 are optionally substituted with halogen atoms and/or a methyl group.
The particularly suitable groups for R.sup.1 in this invention are a methyl group, ethyl group, phenyl group,.gamma.-trifluoropropyl group, cyanoethyl group, vinyl group, and an allyl group.
A mixture (a) was prepared by mixing 100 parts of methyl vinyl polysiloxane which comprises 99.8 mol % of dimethyl siloxane units and 0.2 mol % of vinyl methyl siloxane units (viscosity: 5,000,000 cSt), and 40 parts of hydrophobic fumed silica with a specific surface area of 200 m.sup.2 /g.
www.freepatentsonline.com /5384384.html   (2576 words)

  
 CblE disease   (Site not responding. Last check: 2007-11-03)
Patients of the cblE complementation group of disorders of folate/cobalamin metabolism who are defective in reductive activation of methionine synthase exhibit megaloblastic anemia, developmental delay, hyperhomocysteinemia, and hypomethioninemia.
In its activated form, S-adenosylmethionine, it is the methyl donor in hundreds of biological transmethylation reactions and the donor of propylamine in polyamine synthesis.
The reductive methylation in the lower part of the scheme is the mechanism by which S-adenosylmethionine (Ado-Met) together with an electron reactivates the enzyme after oxidative inactivation.
www.geocities.com /dleclerc.geo/cblE.html   (805 words)

  
 Iodomethane - Wikipedia, the free encyclopedia
Methyl iodide is widely used in organic synthesis to deliver a methyl group into a structure, a process called methylation, usually via S
This is valuable in the methylation of stabilized enolates (such as those from 1,3-dicarbonyl compounds), where alkylation of an enolate may occur on the harder oxygen atom rather than the (usually desired) carbon atom.
Methyl chloride is a poorer methylating reagent than MeI, though it is often adequate.
en.wikipedia.org /wiki/Methyl_iodide   (686 words)

  
 friedel-crafts reactions of benzene and methylbenzene
An acyl group is an alkyl group attached to a carbon-oxygen double bond.
Normally, the methyl group in methylbenzene directs new groups into the 2- and 4- positions (assuming the methyl group is in the 1- position).
The reason for the 2,4- directing effect of the methyl group in methylbenzene lies in the fact that the 2- and 4- isomers form faster than the 3- isomer.
www.chemguide.co.uk /organicprops/arenes/fc.html   (1087 words)

  
 Wellness Goods :: Health Products :: Gematria :: Cellular Clocks
Methyl groups modify a specific DNA base at birth to create a fifth element of DNA — cytosine bases with a methyl group bonded to the number 5 position in the cytosine ring.
The level of cytosine methylation at birth is quite significant, and varies from 2 — 6%, depending on the type of cell.
Methyl Groups — Root Currency of All Organic Chemistry: Methyl groups are used for far more than key anchors on DNA.
www.wellnessgoods.com /gemcellularclocks.asp   (2805 words)

  
 Wikinfo | Group
In mathematics, a group is a set together with a binary operation satisfying certain algebraic conditions.
In astronomy, a group is a small number of galaxies (up to 50 or so) that are near each other, like the Local Group, which is the group of galaxies we live in.
In sociology, a group involves a sub-set of a culture or of a society: see group (sociology).
www.wikinfo.org /wiki.php?title=Group   (218 words)

  
 Planet Ark : US grain group seeks methyl bromide ban exemption   (Site not responding. Last check: 2007-11-03)
Methyl bromide, which is used to kill insects in grain mills, is being phased out under a United Nations agreement that linked the chemical to depletion of the earth's ozone layer.
Methyl bromide is being phased out under the U.N. plan with a 25 percent reduction in 1999 and again in 2001, followed by a 20 percent reduction in 2003.
About 75 percent of methyl bromide used in the United States fumigates soil before planting crops, while 11 percent is used to fumigate harvested commodities during storage and export.
www.planetark.org /dailynewsstory.cfm/newsid/17899/story.htm   (534 words)

  
 HEN1 recognizes 21-24 nt small RNA duplexes and deposits a methyl group onto the 2' OH of the 3' terminal nucleotide -- ...
the methyl group on to the 2' OH of the 3' terminal nucleotide.
group on the ribose of the 3' terminal nucleotide was not determined.
of 2' methylation and 3' methylation in a population of molecules.
nar.oxfordjournals.org /cgi/content/full/34/2/667   (4753 words)

  
 Chapter 25 Suggested Homework Answers
There is an ethyl group on carbon number 4 and two methyl groups:  one at carbon 2, the other at carbon 4:
There are three methyl groups, two on carbon number 3 and one on carbon number 5.
There are 3 methyl groups, one on carbon number 3 and two on carbon number 4.
www.tarleton.edu /~alow/prob25.htm   (461 words)

  
 Methyl Manual, 2. Dance of the Methyl Groupies, SAM-e and the Methylation Process, Nancy Hopkins, 21C-Online   (Site not responding. Last check: 2007-11-03)
Methy Groups are carried by one molecule to a place where a second molecule needs a Methyl Group to begin a chemical reaction.
The chemicals are rearranged in the magical process of methylation until an entirely new structure is formed.
The Methyl Group SAM-e had carried is lost to the bystander.
www.miami-dade-online.com /MethylManual2.htm   (2542 words)

  
 Organic Chemistry Tutorial
Where necessary, as in the isomeric methyl pentanes, indicate by a number the carbon to which the branching alkyl group is attached.
The ethyl group is named before the methyl group because "e" (as in ethyl) comes alphabetically before "m" (as in methyl).
The prefix "iso-" is used to designate any alkyl group (of six carbons or less) that has a single one-carbon branch on the next-to-last carbon of a chain and has the point of attachment at the opposite end of the chain.
www.sciencegeek.net /APchemistry/organic/ochem.shtml   (1130 words)

  
 Environmental Working Group - Methyl Bromide in California   (Site not responding. Last check: 2007-11-03)
Methyl bromide monitoring at a Central California mobile home park found high levels of methyl bromide escaping the adjacent strawberry field.
Methyl bromide was detected at a distance eleven times greater than the state mandated buffer zone.
The methyl bromide levels measured were the highest found by EWG in an ongoing statewide air monitoring study.
www.ewg.org /california/ca-mb.html   (417 words)

  
 Biotechnology's newest chemical tool
Methyltransferases require a source for the methyl groups that they attach to DNA, and most often that source is a molecule called S-Adenosyl-L-methionine (AdoMet), sometimes known as SAM or SAMe.
To try out their technique, the scientists synthesized molecules that mimicked AdoMet, but had chemical groups with longer carbon chains in the position where the methyl group was usually located.
Earlier studies had suggested that the transfer of chemical groups larger than a methyl group would not be possible, in part because replacing AdoMet's methyl group lowered the chemical reactivity of the compound.
www.physorg.com /news8557.html   (1026 words)

  
 Naming aromatic compounds
This is an ethene molecule with a phenyl group attached.
The substituted groups are named in alphabetical order, and the "1" position is assigned to the first of these - rather than to the more logical methyl group.
There is a -COOH group attached to the ring and, because the name is based on benzoic acid, that group is assigned the number 1 position.
www.chemguide.co.uk /basicorg/conventions/names3.html   (1352 words)

  
 TACA: Autism - Medical Testing, Common Issues & Treatment Information   (Site not responding. Last check: 2007-11-03)
This group has an excellent prognosis as long as the therapy is maintained for 2 to 3 years.
Because methylation affects all parts of the brain including the hippocampus and limbic system, for the first time in their lives, or at least to a stronger degree than ever before, they not only feel their emotions but act appropriately upon them and cry.
Grouping similar responses prior to describing the changes observed for each group is the preferred way to arrange the letter, e.g.
www.tacanow.com /Methyl_B12_Treatments.htm   (6092 words)

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