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Topic: Methanethiol

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	wcbstv.com - What is Methyl Mercaptan?
		Methanethiol remains in solution in the desired concentration as the propane is piped and trucked through the distribution system until it is stored in the tank from which it will be used.
		Methanethiol tanks are similar in construction to tanks used for propane and anhydrous ammonia.
		Methanethiol is also manufactured for use in the plastics industry, as a precursor in the manufacture of pesticides, and as a jet fuel additive.
	wcbstv.com /topstories/methyl.mercaptan.methanethiol.2.241198.html (1075 words)

	Methanethiol Encyclopedia Article @ Laky.org (Site not responding. Last check: 2007-10-31)
		Methanethiol is released from decaying organic matter in 1 Uses and is present in the Ethanethiol of certain regions in the United States, in ammonia, and in some blood.
		Methanethiol is primarily used as an natural gas to add warning properties to odorant and natural gas used as fuel.
		Methanethiol is also manufactured for use in the edit industry, as a precursor in the manufacture of brain, and as a SMILES additive.
	www.laky.org /encyclopedia/Methanethiol (902 words)

	Methanethiol - Wikipedia, the free encyclopedia
		Methanethiol (also known as methyl mercaptan) is a colorless gas with a smell like rotten cabbage.
		Methanethiol is a weak acid, with a pKa of ~10.4.
		Methanethiol tanks are similar in construction to tanks used for propane and anhydrous ammonia.
	en.wikipedia.org /wiki/Methanethiol (709 words)

	Discovery Online, The Skinny On... Asparagus Pee
		I'm voting for methanethiol, partly because the guy who did the gas chromatography left no forwarding address, and partly because the methanethiol entry in my aging Merck Index of chemicals is so interesting.
		Methanethiol is composed mostly of sulfur with a splash of hydrogen, plus some carbon, a brew famous for its effect in rotten eggs, cabbages and paper mills.
		To increase the concentration of methanethiol molecules available to your snoot, you could either intentionally dehydrate yourself before you dine (this is unhealthful); or pee into a cup and sniff that.
	www.discovery.com /area/skinnyon/skinnyon970115/skinny1.html (551 words)

	Smelly Feet-Methanethiol Relating to Smelly Feet
		The bacteria that are responsible for smelly feet will actually metabolize all the waste produced by the sweat along with dead skin to convert amino acid methionine to methanethiol.
		Basically Methanethiol is the gas produced after the bacterial have finished processing the waste products from the sweat and dead skin.
		Methanethiol (also known as methyl mercaptan) is a colorless gas with a smell like rotten cabbage.
	www.smelly-feet.org /methanethiol-relating-to-smelly-feet.html (206 words)

	dan2
		Methanethiol which was one of the first compounds formed under anaerobic conditions appears to be primarily responsible for the offensive odor.
		A significant amount of methanethiol evolved after the addition of L-cysteine (Table 3), suggesting that the reaction leading to the formation of methanethiol by the addition of L-cysteine, may not be enzymatic.
		Methanethiol is considered to be produced as a result of the conversion of S-methyl-L-cysteine sulfoxide to an unstable methanesulfenic acid intermediate by C-S lyase in Brassica which is then condensed and dehydrated to form more stable methyl methanethiosulfinate.
	ss.jircas.affrc.go.jp /kankoubutsu/jarq/33-2/Dan/dan2.htm (1257 words)

	Technology & Living Standards - Food Organic Acids
		Methanethiol is released from decaying organic matter in marshes and is present in the natural gas of certain regions in the United States, in coal tar, and in some crude oils.
		Methanethiol is primarily used as an odorant to add warning properties to propane and natural gas used as fuel.
		Methanethiol is added for safety, so that gas leaks are readily noted by anyone present due to the odor.
	www.mikalac.com /tech/met/org.html (1935 words)

	Development of a New Methanethiol Quantification Method Using Ethanethiol as an Internal Standard
		Development of a new method to quantify methanethiol in which ethanethiol was employed as an internal standard is reported.
		Recovery yields for methanethiol from an aqueous model system and a soy protein concentrate (SPC) aqueous slurry determined with this method ranged from 97 to 107% and from 103 to 121%, respectively.
		The methanethiol content of two commercial SPCs and two commercial soy protein isolate (SPI) samples, on a dry basis, ranged from 835 to 1190 times greater than the odor threshold for methanethiol.
	pubs.acs.org /cgi-bin/abstract.cgi/jafcau/2001/49/i08/abs/jf001447u.html (263 words)

	Anaerobic versus Aerobic Degradation of Dimethyl Sulfide and Methanethiol in Anoxic Freshwater Sediments -- Lomans et ...
		Anaerobic versus Aerobic Degradation of Dimethyl Sulfide and Methanethiol in Anoxic Freshwater Sediments -- Lomans et al.
		Anaerobic versus Aerobic Degradation of Dimethyl Sulfide and Methanethiol in Anoxic Freshwater Sediments
		Degradation of dimethyl sulfide and methanethiol in slurries prepared from sediments of minerotrophic peatland ditches were
	aem.asm.org /cgi/content/abstract/65/2/438 (364 words)

	Sulphur Compounds, Organic (Site not responding. Last check: 2007-10-31)
		Also, methanethiol and ethanethiol occur naturally as “sour” gas at room temperature, while the other thiols are liquids.
		Systemically, methanethiol acts like hydrogen sulphide and may depress the central nervous system, resulting in respiratory paralysis and death.
		Because hydrogen sulphide is a raw material used or generated in thiol manufacturing plants, special precautions are necessary to prevent its release in hazardous concentrations.
	www.ilo.org /encyclopaedia/?print&nd=857300066 (3095 words)

	Research Publication
		Their concentrations in the butter itself were calculated by determination of the distribution coefficient (K) through spiking butter samples with known quantities of methanethiol and dimethyldisulphide.
		Solid phase microextraction used in conjunction with gas chromatography -mass spectrometry has been shown to be an effective method for headspace analysis and was used for quantifying the butter headspace concentrations of the reduced sulphur compounds.
		Seasonal variation of both methanethiol and dimethyldisulphide were found in a series of butter samples.
	www.che.auckland.ac.nz /research/abstract.aspx?pubid=1583 (210 words)

	Differentiation of mouth versus gut as site of origin of odoriferous breath gases after garlic ingestion -- Suarez et ...
		halitosis; sulfur-containing gases; allyl methyl sulfide; methanethiol; allyl mercaptan
		Gases identified were 1) hydrogen sulfide, 2) methanethiol, 3) allyl mercaptan, 4) allyl methyl sulfide, 5) allyl methyl disulfide, and 6) allyl disulfide.
		In the present study garlic was used as a probe to distinguish the relative importance of the mouth versus the gut in the
	ajpgi.physiology.org /cgi/content/full/276/2/G425 (2974 words)

	Headspace Evaluation of Methanethiol and Dimethyl Trisulfide in Aqueous Solutions of Soy-protein Isolates (Site not responding. Last check: 2007-10-31)
		Based on dynamic headspace analyses, the most powerful odorants were (1) dimethyl trisulfide, (2) methanethiol, (3) hexanal, (4) an unidentified charred, sweaty feet-like odor, (5) 2-pentyl furan, (6) 2,3-butadione, and (7) an unknown burnt-like odor.
		The most powerful odorants by static headspace analyses were (1) dimethyl trisulfide, (2) hexanal, (3) methanethiol, and (4) 2-pentyl furan.
		Using deuterium labeled DMTS as an internal standard, DMTS was quantified at 60.1 and 45.5 ppb in the SPIs.
	confex2.confex.com /store/items/ift/jfs65-0819.htm (181 words)

	Absolute electron-scattering total cross section measurements for methanethiol molecule, CH3SH, from 0.6 to 250 eV
		The absolute total cross section for electron scattering on CH SH molecules has been measured in a linear electron-transmission experiment for impact energies between 0.6 eV and 250 eV.
		Static electric dipole polarizability of methanethiol has been estimated using a correlation of electron-scattering total cross section with target polarizability.
		The polarizability of CH SH thus obtained is in good agreement with values derived by empirical methods.
	stacks.iop.org /0953-4075/28/L629 (264 words)

	Dimethylsulfoniopropionate - Wikipedia, the free encyclopedia
		It's major breakdown product is methanethiol (CH SH) which is assimilated by bacteria into protein sulfur.
		DMS is also taken up by marine bacteria, but not as rapidly as methanethiol.
		This is probably due to the non-linear abiotic and microbial uptake of methanethiol in seawater, and the comparatively low reactivity of DMS.
	en.wikipedia.org /wiki/Dimethylsulfoniopropionate (404 words)

	Presses scientifiques du CNRC :
		Abstract: The dehydrogenation reaction paths of methanethiol CH SH were analyzed by abinitio MO calculations.
		The path of methanethiol has two characteristic steps before the transition state, while neither paths of the two carbinols have such multisteps.
		The electronic intramolecular interaction between subsystems of the reactant molecule is investigated in terms of Interaction Hybrid Molecular Orbital (IHMO).
	pubs.nrc-cnrc.gc.ca /cgi-bin/rp/rp2_abst_f?cjc_v85-261_63_ns_nf_cjc (337 words)

	Food/Asparagus/asparagine (Site not responding. Last check: 2007-10-31)
		"The pungent urinary odour produced by certain individuals within a few hours of eating asparagus has been shown to be due to a combination of up to six sulphur-containing alkyl compounds identified as methanethiol, dimethyl sulphide, dimethyl disulphide, bis-(methylthio)methane, dimethyl sulphoxide and dimethyl sulphone.
		S-Methyl thioacrylate and S-methyl 3-(methylthio)thiopropionate were identified from methylene chloride extracts of such urines and appear to be the odor-causing compounds.
		Methanethiol, the previously reported odor-causing agent, was not detected in these methylene chloride extracts."
	tafkac.org /food/asparagus/asparagine.html (244 words)

	Great Moments in Science - Bum Breath
		Its level was about 1.3 times greater than another sulphur-containing gas, methanethiol, which smells like rotting cabbage.
		Eating food, like breakfast, reduced the concentration of methanethiol (the rotten cabbage gas), as did brushing the tongue (not the teeth) with a toothbrush for one minute with water.
		In fact, a dry hard bread roll was also very effective in reducing the concentration of methanethiol.
	www.abc.net.au /science/k2/moments/s426489.htm (933 words)

	GARLMER ABSTRACTS - González et al. - In Press (Site not responding. Last check: 2007-10-31)
		Fifteen strains representing the Roseobacter group (a phylogenetic cluster of marine bacteria in the alpha-subclass of Proteobacteria) were isolated from seawater, primarily from the southeastern U.S. Although over half the isolates were obtained without any selection for sulfur metabolism, all were able to degrade the sulfur containing osmolyte dimethylsulfoniopropionate (DMSP), with production of dimethylsulfide (DMS).
		Five isolates were able to reduce DMSO to DMS, and several also degraded DMS and methanethiol.
		The ability to incorporate reduced sulfur in DMSP and methanethiol into cellular material was studied in one of the isolates.
	lmer.marsci.uga.edu /abstracts/Gonzalez2.html (263 words)

	JCE 2004 (81) 1524 [Oct] Volatile Organic Sulfur Compounds of Environmental Interest: Dimethyl Sulfide and ... (Site not responding. Last check: 2007-10-31)
		JCE 2004 (81) 1524 [Oct] Volatile Organic Sulfur Compounds of Environmental Interest: Dimethyl Sulfide and Methanethiol.
		Two important members of this group, dimethyl sulfide, DMS, and methanethiol, MT, are formed by living organisms as well as by abiotic processes.
		DMS is synthesized by various organisms in the marine environment and large quantities of it are released to the atmosphere.
	jchemed.chem.wisc.edu /journal/issues/2004/Oct/abs1524.html (291 words)

	Bates et al. -- Sulfur Emissions to the Atmosphere from Natural Sources
		Although the sulfide ion is clearly present in surface seawater in concentrations ranging from 0.1 to 1.1 nmol/L (Cutter and Krahforst, 1988), it is likely complexed with trace metals (Elliott, 1988; Dyrssen, 1989; Elliott et al., 1989; Elliott and Rowland, 1990), and hence, not in a volatile form.
		The other potentially important volatile species are methanethiol (CH and dimethyldisulfide (CH Methanethiol is produced in anoxic marine sediments (Kiene and Visscher, 1987; Sorensen, 1988), in decomposing algal mats (Zinder et al., 1977), and in coastal waters (Leck and Rodhe, 1990), but as yet has not been quantified in open ocean surface seawater.
		Our experience has shown that methanethiol and dimethyldisulfide can be produced as an artifact of sampling/analysis if plankton cells undergo anaerobic decomposition (Bates, unpublished data).
	www.pmel.noaa.gov /pubs/outstand/bate1229/estimate.shtml (4998 words)

	CiteULike: Inhibition of methane oxidation by volatile sulfur compounds (CH3SH and CS2) in landfill cover soils. (Site not responding. Last check: 2007-10-31)
		Methanethiol and carbon disulphide were investigated for their ability to inhibit methane oxidation in two landfill cover soils.
		Methanethiol was found to be a competitive inhibitor, and at concentrations occurring in landfills, both these VSCs (volatile sulfur compounds) had inhibitory effects on the methane oxidation rates.
		@article{citeulike:115186, abstract = {Methanethiol and carbon disulphide were investigated for their ability to inhibit methane oxidation in two landfill cover soils.
	www.citeulike.org /user/raizada/article/115186 (289 words)

	Flatulenz im Endstadium
		In 22% ofsamples, methanethiol concentration exceeded that of hydrogensulphide.
		Values for hydrogen sulphide (fl columns), methanethiol (shaded columns), and dimethyl sulphide (white columns) are shown as mean (SEM) from a total of 58 instillations in eight subjects.
		Since hydrogen sulphide was thepredominant sulphur gas in 78% of samples and the concentrationof this gas had the strongest correlation with odour, it seemslikely that hydrogen sulphide was the most important determinantof flatus odour.
	www.fortunecity.de /roswell/kafka/66/flatus.html (2453 words)

	Anaerobic versus Aerobic Degradation of Dimethyl Sulfide and Methanethiol in Anoxic Freshwater Sediments -- Lomans et ...
		In anoxic freshwater sediments dimethyl sulfide (DMS) and methanethiol (MT) are generally considered to be the dominant volatile
		Formation of dimethyl sulfide and methanethiol in anoxic freshwater sediments.
		Microbial consumption of dimethyl sulfide and methanethiol in coastal marine sediments.
	aem.asm.org /cgi/content/full/65/2/438 (3759 words)

	AHPCRC Technical Report Abstracts 2006 (Site not responding. Last check: 2007-10-31)
		ABSTRACT: The interaction of methanethiol molecules with the Au(111) surface is investigated using Density Functional Theory within three-dimensional boundary conditions.
		It is found for the first time that the S-H bond remains intact when the methanethiol molecules are adsorbed on the regular Au(111) surface.
		The presented calculations show that a methanethiol layer on the regular Au(111) surface does not dimerize.
	www.ahpcrc.org /publications/preprints/abstracts2006.html (3066 words)

	Jon Ashton - Chef - Recipe for Life (Site not responding. Last check: 2007-10-31)
		Sue, yes it is true, I can attest to it.
		I am led to believe that when the body metabolizes it, a sulfur-containing substance called aspragustic acid, a similar chemical relative to of the essence of the skunk (!) called methanethiol is produced.
		It truly isn't awfully pleasant to the nose, studies say that the majority of us produce methanethiol after chowing down on asparagus, but not all are to smell it.
	test.jonashton.com /askjon (602 words)

	NAI - Astronomy Focus Group - Workshops
		One example is organo-sulfur compounds such as methanethiol and DMS (Pilcher, 2003) which are important in Earth’s modern ecosystem and may have been important in Earth’s ancient past as well.
		If present in a high enough quantity, methanethiol or DMS would overlap with the atmospheric ozone signature in the mid-infrared, confusing any low-resolution spectral detection.
		Chemists and biologists are used to working with relatively high-spectral resolution observations in narrow spectral regions to identify Earth-based biomarkers.
	www.dtm.ciw.edu /seager/NAIAFG/AFGBiomarkers.html (434 words)

	ARKAT USA, Inc.
		This is formed when the initial adduct loses carbon dioxide and methanethiol.
		As this compound was not observed, it must rapidly lose methanethiol to give the substituted benzene 6; or rearrange by way of a [1,5]-sulfenyl migration to give 5.
		The cyclohexadiene derivative 5 builds up to become the major component of the mixture (Figure 2), suggesting that for 4, the [1,5]-sulfenyl migration is more facile than the elimination of methanethiol.
	www.arkat-usa.org /home.aspx?VIEW=MANUSCRIPT&MSID=1590 (1748 words)

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