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Topic: Decarboxylations

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	Decarboxylation -- Facts, Info, and Encyclopedia article (Site not responding. Last check: 2007-10-22)
		Other decarboxylation reactions from the (In all plants and animals: a series of enzymatic reactions in mitochondria involving oxidative metabolism of acetyl compounds to produce high-energy phosphate compounds that are the source of cellular energy) citric acid cycle include:
		Chemical decarboxylations (A bodily process occurring due to the effect of some foregoing stimulus or agent) reactions often require extensive heating in high-boiling solvents.
		Decarboxylations are especially easy for alpha- (Click link for more info and facts about keto) keto acids due to the formation of a cyclic transitional state.
	www.absoluteastronomy.com /encyclopedia/d/de/decarboxylation.htm (229 words)

	Read about Decarboxylation at WorldVillage Encyclopedia. Research Decarboxylation and learn about Decarboxylation here! (Site not responding. Last check: 2007-10-22)
		Chemical decarboxylations reactions often require extensive heating in high-boiling solvents.
		Also the addition of catalytic amounts of cyclohexen-2-one has been reported to catalyze the decarboxylation of amino acids.
		Decarboxylations are especially easy for alpha-keto acids due to the formation of a cyclic transitional state.
	encyclopedia.worldvillage.com /s/b/Decarboxylation (107 words)

	Untitled Document (Site not responding. Last check: 2007-10-22)
		TPP is the coenzyme for all decarboxylations of alpha-keto acids.
		Decarboxylation of the addition compound with the thiazole ring acting as an electron sink in forming a resonance-stabilized eneamine.
		Two decarboxylation reactions occur in the cycle to yield two carbon dioxide molecules and the oxaloacetate is regenerated to begin another cycle.
	oregonstate.edu /instruction/bb451/winter2004/winter04specific/lectnoteskga/citricacidcycle.html (2915 words)

	Decarboxylation
		Decarboxylation is a chemical reaction in which a carboxyl group (-COOH) is split off as carbon dioxide (CO Common biosynthetic decarboxylations of amino acids to amines are:
		The enzyme class required for decarboxylations are called decarboxylases or, more correct, carboxy-lyases (E.C.4.1.1).
		Chemical decarboxylations reactions often require extensive heating in high-boiling solvents with evolution of carbon dioxide.
	pedia.newsfilter.co.uk /wikipedia/d/de/decarboxylation.html (165 words)

	Decarboxylation - Wikipedia, the free encyclopedia
		A Decarboxylation is any chemical reaction in which a carboxyl group (-COOH) is split off from a compound as carbon dioxide (CO Common biosynthetic decarboxylations of amino acids to amines are:
		Enzymes that catalyze decarboxylations are called decarboxylases or, more formally, carboxy-lyases (E.C.4.1.1).
		This page was last modified 06:50, 30 April 2005.
	en.wikipedia.org /wiki/Decarboxylation (167 words)

	The chemical logic behind... the citric acid cycle (Site not responding. Last check: 2007-10-22)
		Citrate is then isomerized to isocitrate, which is then decarboxylated to
		If citrate had not been isomerized to isocitrate, this decarboxylation would yield a branched carbon compound, much harder to metabolize.
		We can predict that it will react like pyruvate, i.e., that its decarboxylation may yield enough energy to enable the formation of a thioester bond with coenzyme A. And this indeed occurs...
	www2.ufp.pt /~pedros/bq/tca.htm (409 words)

	Evidence for two uroporphyrinogen decarboxylase isoenzymes in human erythrocytes. (Site not responding. Last check: 2007-10-22)
		This provides the first evidence that decarboxylations of uroporphyrinogen to coproporphyrinogen are catalyzed by two isoenzymes.
		Native polyacrylamide disc gel electrophoresis of the purified enzyme preparation showed two bands detected by staining either for protein or with uroporphyrin-I. In animals and plants, uroporphyrinogen decarboxylase catalyzes the stepwise decarboxylations of uroporphyrinogen, the precursor of heme and chlorophyll.
		Both proteins were able to catalyze all four decarboxylation steps, though the ratios of enzyme activity using octa-, hepta-, hexa- to pentacarboxylic porphyrinogen substrates were distinctly different.
	www.pdg.cnb.uam.es /UniPub/iHOP/gp/5693939.html (171 words)

	Abnormal kinetics of uroporphyrinogen decarboxylase (Site not responding. Last check: 2007-10-22)
		Uroporphyrinogen decarboxylase is an essential enzyme in all organisms and functions in the heme biosynthetic pathway, catalyzing the decarboxylation of the four acetate groups of uroporphyrinogen to form coproporphyrinogen.
		This work examines whether the four sequential decarboxylations occur at the same active site, and explores whether hexachlorobenzene-induced porphyria affects the behavior of the enzyme.
		In contrast, in experiments with enzyme from rats with hexachlorobenzeneinduced porphyria, the total rate for mixtures was always lower than the reference rate; and a curve with a deep minimum was obtained, indicating that the two reactions occur at functionally different sites, but with cross-inhibition.
	bip.cnrs-mrs.fr /bip10/chaufan.htm (334 words)

	Tetrahedral intermediates in thiamin diphosphate-dependent decarboxylations exist as a 1',4'-imino tautomeric form of ... (Site not responding. Last check: 2007-10-22)
		Tetrahedral intermediates in thiamin diphosphate-dependent decarboxylations exist as a 1',4'-imino tautomeric form of the coenzyme, unlike the michaelis complex or the free coenzyme.
		Tetrahedral intermediates in thiamin diphosphate-dependent decarboxylations exist as a 1',4'-imino tautomeric form of the coenzyme, unlike the michaelis complex or the free coenzyme.As the positive band near 300 nm reports on the 1',4'-imino tautomer of ThDP, methods are now available for kinetic monitoring of both tautomeric forms.
		Addition of the tetrahedral ThDP-acetaldehyde adduct, 2-alpha-hydroxyethylThDP, to PDHc-E1 generates the positive band at 300 nm, consistent with the formation of the 1',4'-iminopyrimidine tautomer, as also demonstrated for phosphonolactylthiamin diphosphate, a stable analogue of the tetrahedral ThDP-pyruvate adduct 2-alpha-lactylThDP (Jordan, F. et al.
	www.pdg.cnb.uam.es /UniPub/iHOP/gp/10343718.html (231 words)

	[No title] (Site not responding. Last check: 2007-10-22)
		An indirect kinetic method for determining rate constants of carbon- centered radical rearrangements which has been reported will be further developed such that it will have an ultimate kinetic resolution at room temperature of about one picosecond and will be useful even when direct kinetic studies are not possible.
		The indirect method will be extended to decarboxylations of acyloxy radicals and reactions of nitrogen-centered radicals.
		A direct laser-flash kinetic method will also be utilized to study decarboxylations of acyloxy radicals as well as rearrangements of carbon- and nitrogen-centered radicals.
	www.cs.utexas.edu /users/yguan/NSFAbstracts/Abstracts/MPS/CHE.MPS.a9117929.txt (301 words)

	Decarboxylations (Site not responding. Last check: 2007-10-22)
		The word "decarboxylations" uses 16 letters: A A B C D E I L N O O R S T X Y.
		Words within decarboxylations not shown as it has more than seven letters.
		List all words starting with decarboxylations, words containing decarboxylations or words ending with decarboxylations
	www.morewords.com /word/decarboxylations (185 words)

	Crystal structure of human uroporphyrinogen decarboxylase -- Whitby et al. 17 (9): 2463 -- The EMBO Journal (Site not responding. Last check: 2007-10-22)
		The acetate side chains of uroporphyrinogen III are decarboxylated to methyl groups with the liberation of four molecules of carbon dioxide.
		In the type-I isomer, the acetate and propionate side chains of the D ring are ordered as on the other pyrrole rings, and the molecule is symmetrical.
		Barnard, G.F. and Akhtar, M. Stereochemical and mechanistic studies on the decarboxylation of uroporphyrinogen III in haem biosynthesis.
	embojournal.npgjournals.com /cgi/content/full/17/9/2463 (5131 words)

	Agmatine Free discussion
		American women are will always cheat on you if you are ugly.
		A Decarboxylation is any chemical reaction in which a carboxyl group
		Common biosynthetic decarboxylations of amino acids to amines are:
	www.gyxe.com /discussion/43-230-agmatine-read.shtml (1691 words)

	Harry A (Site not responding. Last check: 2007-10-22)
		Two pathway enzymes catalyze multiple decarboxylations and yet have no cofactors, and one enzyme catalyzes a six-electron oxidation with a single FAD.
		From these studies, it is clear that the linear bilane produced by PBGD is the substrate for uroporphyrinogen III synthase, and that the reaction pathway involves a spiro mechanism to rearrange ring D (Fig.
		Coproporphyrinogen III (but not the I isomer) is oxidatively decarboxylated to protoporphyrinogen IX by the enzyme coproporphyrinogen oxidase (CPO) (E.C.1.3.3.3) [2].
	www.bmolchem.wisc.edu /teachinglab/fall675/pjkdailey.html (4186 words)

	Brainstorms: John A. Davison: Is Evolution Finished?
		Pyruvic acid: Hardebeck, HG, Krampitz, G, Wulf, L. Decarboxylation of pyruvic acid in aqueous solution by thermal proteinoids.
		Oxaloacetic acid: Rohlfing, DL THe catalytic decarboxylation of oxaloacetic acid by thermally prepared poly-a-aminoacids.
		Photoactivated decarboxylation -- glycoxylic acid, glucuronic acid, pyruvic acid.
	www.iscid.org /boards/ubb-get_topic-f-6-t-000481.html (3852 words)

	Pyridoxine (Vitamin B-6)
		In the body, however, the parahydroxymethyl moietyis oxidized to an aldehyde and the similar group in the meta position is phosphorylated, resulting in the biologically active pyridoxal phosphate.
		This coenzyme is remarkably versatile, being involved in transaminations, decarboxylations, racemizations, and numerous modifications of amino acid side chains.
		Clinically, pyridoxine helps normal function of the brain, promotes blood cell formation, maintains the chemical balance among body fluids, and assists in carbohydrate, protein, and fat metabolism.
	www.mailguard.org /vitamins/vitamin_b6.htm (209 words)

	Chemistry 211 Experiment 10
		In the current experiment, we will use thiamine to catalyze the reaction of benzaldehyde into benzoin.
		Thiamine, functioning as a coenzyme, can be used for (1) the nonoxidative decarboxylations of a-keto acids, (2) the oxidative decarboxylations of a-keto acids, and (3) the formation of a-hydroxy ketones.
		Most biochemical processes are no more than organic chemical reactions carried out under special conditions.
	www.miracosta.cc.ca.us /home/dlr/211exp10.htm (2448 words)

	CCL.NET 1999.03.02-001 (Site not responding. Last check: 2007-10-22)
		Dear CCLers, Could anyone provide me with a (or some) recent reference(s) that gives the range of intrinsic carbon isotope effects in decarboxylation reactions.
		I am most interested in beta-keto acids, but any general information would be useful.
		FAX: +61-2-6249-0415 Similar Messages 03/02/1999: Re: CCL:Intrinsic C13 Isotope Effects for Decarboxylations Raw Message Text
	kekule.osc.edu /cgi-bin/ccl/message.cgi?1999+03+02+001 (114 words)

Decarboxylation : Decarboxylations (Site not responding. Last check: 2007-10-22)

Decarboxylation : Decarboxylations

Decarboxylation : Decarboxylations
article at Free Euro Online Encyclopedia

It uses material from the wikipedia article Decarboxylation : Decarboxylations.

www.eurofreehost.com /de/Decarboxylations.html (93 words)

	[No title] (Site not responding. Last check: 2007-10-22)
		Subject: CCL:Intrinsic C13 Isotope Effects for Decarboxylations Harald Svedung
		Subject: CCL:Intrinsic C13 Isotope Effects for Decarboxylations "Tamas Gunda"
		Subject: CCL:conformational search on ring systems "Tamas Gunda"
	www.ccl.net /cca/archived-messages/1999/03/02.sum (60 words)

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