The large sulfur isotope fractionations are best explained by a combination of mechanisms. First, a pH-dependent isotope effect can partially explain the observation with DA. It has been shown that the light [sulfur-32 (32S)] and heavy (34S) isotopes of sulfur quickly exchange between the two major sulfide species, dihydrogen sulfide (H2S) and monohydrogen sulfide (HS−), in the pH range of the experiment and reach an isotope equilibrium where H2S is +6‰ enriched relative to HS− (12, 13). Since MSO uses H2S as a substrate as opposed to HS− (14), the relative speciation of sulfide, which is pH dependent [pKa (where Ka is the acid dissociation constant) = 6.89], will have an important consequence on the resulting sulfur isotope enrichment. For example, at pH 7 where H2S accounts for 50% of the sulfide, phototrophic sulfide oxidizers consume H2S and produce elemental sulfur (S0). The H2S is +6‰ enriched in 34S relative to HS− but is only +3‰ enriched relative to the bulk sulfide. Thus, ...

We undertook combined stable carbon, nitrogen and sulphur isotope analysis of marine and terrestrial faunal remains from two prehistoric coastal shell middens in Denmark. The aim of the investigation was to establish whether sulphur isotopes were useful in discriminating terrestrial and marine consumers in this region. We found that sulphur isotopes do separate marine and terrestrial fauna but, contrary to our expectations, we observed a negative correlation between δ34S and δ13C values for marine fauna. We conclude that similar studies over a broader geographical range are needed before sulphur isotopes can be reliably used to study coastal resource exploitation. ...

Intramolecular carbon, hydrogen, and sulfur isotope ratios were measured on a homologous series of organic sulfonic acids discovered in the Murchison meteorite. Mass-independent sulfur isotope fractionations were observed along with high deuterium/hydrogen ratios. The deuterium enrichments indicate formation of the hydrocarbon portion of these compounds in a low-temperature environment that is consistent with that of interstellar clouds. Sulfur-33 enrichments observed in methanesulfonic acid could have resulted from gas-phase ultraviolet irradiation of a precursor, carbon disulfide. The source of the sulfonic acid precursors may have been the reactive interstellar molecule carbon monosulfide. ...

Strata-bound sulfide deposits at Ducktown, Tennessee, have many characteristics of volcanogenie exhalative deposits but occur in an overwhelmingly sedimentary environment. Lead isotope ratios of galenas and massive pyritic and pyrrhotitic ores fall into three distinct groups that are not related to wall-rock type, type of ore, or to orebody. A positive correlation between the lead and sulfur isotope ratios of galena indicates a relation between sulfur and lead that does not seem to be an effect of metamorphism but is rather an original feature of the ore. The groupings of lead isotope ratios and a possible bimodality of sulfur isotope compositions, as well as the above-mentioned positive correlation, suggest that Ducktown lead and sulfur represent the mixing of two sources. The dominant source of lead was probably U/Pb-enriched clastic sediments. Seawater sulfate may have dominated sulfur contributions from this source. The second source could have been a deep-seated, mafic igneous source tapped ...

The Archean sub-seafloor has been proposed as an environment for the emergence of life, with septate clusters of titanite microtextures in pillow lava rims argued to be the earliest traces of microbial microboring. Here we use nanoscale secondary ion mass spectrometry (NanoSIMS) to test possible geochemical traces of life in ca. 3.45 Ga pillow lavas of the Barberton Greenstone Belt, South Africa. Sulfide inclusions in the titanite microtextures record strongly negative sulfur isotope fractionations of δ34SVCDT -39.8‰ to -3.2‰ (VCDT-Vienna Canyon Diablo Troilite). These represent the largest range and most negative δ34S values so far reported from the Archean, and are consistent with an early biogenic origin for the sulfides. Extensive in situ elemental mapping did not find any organic linings associated with the microtextures, despite the high spatial resolution and sensitivity of the NanoSIMS. The absence of organic linings thus excludes a key line of evidence previously used to support ...

The sulphide deposits of the Iberian Pyrite Belt (IPB) represent an ore province of global importance. Our study presents 113 new sulphur isotope analyses from deposits selected to represent the textural spectrum of ores. Measured 34S values range from −26 to +10‰ mostly for massive and stockwork ores, in agreement with data previously published. In situ laser 34S analyses reveals a close correlation of 34S with texture. Primary diagenetic textures are dominated by relatively low 34S (−8‰ to −2‰), whereas stockwork feeder textures are dominated by higher 34S (∼+3‰ to +5‰). Intermediate textures (mainly coarse textures in stratiform zones) have intermediate 34S, although they are mostly dominated by the high 34S component. Rare barite has a homogeneous 34S around +18‰, which is consistent with direct derivation from Lower Carboniferous seawater sulphate. A dual source of sulphide sulphur in the IPB deposits has been considered. A hydrothermal source, derived from reduction of ...

We studied the annual variability of the concentration and isotopic composition of main sulfur species and sulfide oxidation intermediates in the water column of monomictic fresh-water Lake Kinneret. Sulfate concentrations in the lake are |1 mM and similar to concentrations that are proposed to have existed in the Paleoproterozoic ocean. The main goal of this research was to explore biogeochemical constrains of sulfur cycling in the modern low-sulfate fresh-water lake and to identify which processes may be responsible for the isotopic composition of sulfur species in the Precambrian sedimentary rocks. At the deepest point of the lake, the sulfate inventory decreases by more than 20% between March and December due to microbial sulfate reduction leading to the buildup of hydrogen sulfide. During the initial stages of stratification, sulfur isotope fractionation between sulfate and hydrogen sulfide is low (11.6 ‰) and sulfur oxyanions (e.g. thiosulfate and sulfite) are the main products of the incomplete

Understanding the changes in, and drivers of, isotopic variability of sulfur in seawater sulfate (δ34SSO4-sw) over geological time remains a long-standing goal, particularly because of the coupling between the biogeochemical sulfur and carbon cycles. The early Cenozoic has remained enigmatic in this regard, as the existing seawater sulfate isotopic records appear to be decoupled from the well-defined carbon isotope composition of the ocean. Here, we present a new Cenozoic record of sulfur isotopes, using carbonate-associated sulfate hosted in the calcite lattice of single-species foraminifera. The vastly improved stratigraphy afforded by this record demonstrates that carbon and sulfur cycles, as recorded by their isotopes, are not fully decoupled in the early Cenozoic. With a model driven by partial coupling of the carbon and sulfur cycles, we demonstrate that a change in sulfur isotopic fractionation of the pyrite burial flux best explains the large increase in δ34SSO4-sw ~53 million years ago (Ma)

Cyclic variations of ??34S values over a range of at least 48??? in pyrite nodules from stratabound Ni-Mo-PGE(Au) ores of southern China are attributed to biogenic reduction of seawater sulfate in an anoxic, phosphogenic, and metallogenic basin. Cyclic introduction and mixing of normal seawater into typically stagnant basin waters led to extreme variations in ??34S values of aqueous sulfide species present at different times. Intermittent venting of metal-laden hydrothermal fluids into such a bacteriogenic sulfide-rich environment resulted in precipitation of metal sulfides as pseudomorphous replacements of organic debris and as sulfide sediments that record large ??34SCDT variations from -26 to +22???. Apatite and silica dominated the replacement of the organic debris when metals were not being introduced into the basin. The combination of abundant organic debris, localized topographic basins for accumulation of the debris, bacterial production of sulfide species, and introduction of metal-bearing

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Liu J, Pellerin A, Izon G, Wang J, Antler G, Liang J, Su P, Jørgensen BBarker, Ono S. 2020. The multiple sulphur isotope fingerprint of a sub-seafloor oxidative sulphur cycle driven by iron. Earth and Planetary Science Letters. 536:116165. ...

Liu J, Pellerin A, Izon G, Wang J, Antler G, Liang J, Su P, Jørgensen BBarker, Ono S. 2020. The multiple sulphur isotope fingerprint of a sub-seafloor oxidative sulphur cycle driven by iron. Earth and Planetary Science Letters. 536:116165. ...

Li Xu is the author of these articles in the Journal of Visualized Experiments: Efficient Generation of hiPSC Neural Lineage Specific Knockin Reporters Using the CRISPR/Cas9 and Cas9 Double Nickase System, A 5-mC Dot Blot Assay Quantifying the DNA Methylation Level of Chondrocyte Dedifferentiation In Vitro, Preparation of Authigenic Pyrite from Methane-bearing Sediments for In Situ Sulfur Isotope Analysis Using SIMS

Date: Apr 13, 2015. Author: separationsNOW. The precise cryogenic separation of oxygen-argon mixtures from natural air samples has been accomplished using a single 5Å (30/60 mesh) molecular sieve column at liquid nitrogen temperature, which is associated with isotopic fractionation.. Read More ...

The relationship between the development of iron sulfide and barite nodules in the Cenomanian Chalk of England and the presence of a red hematitic pigment has been investigated using sulfur isotopes. In southern England where red and pink chalks are absent, iron sulfide nodules are widespread. Two typical large iron sulfide nodules exhibit δ34S ranging from −48.6‰ at their core to −32.6‰ at their outer margins. In eastern England, where red and pink chalks occur in three main bands, there is an antipathetic relationship between the coloured chalks and the occurrence of iron sulfide or barite nodules. Here iron sulfide, or its oxidised remnants, are restricted to two situations: (1) in association with hard grounds that developed originally in chalks that contained the hematite pigment or its postulated precursor FeOH3, or (2) in regional sulfidization zones that cut across the stratigraphy. In the Cenomanian Chalk exposed in the cliffs at Speeton, Yorkshire, pyrite and marcasite (both ...

Ancient sediments that once resided on a lake bed and the ocean floor show sulfur isotope ratios unlike those found in other samples from the same time, calling into question accepted ideas about when the Earths atmosphere began to contain oxygen, according to researchers from the U.S., Canada and Japan. The popular model is that there was little oxygen in the Earths atmosphere before about 2.4 billion years ago, says Dr. Hiroshi Ohmoto, professor of geochemistry and director, Penn State Astrobiology Research Center. Scientists use the ratio of the various sulfur isotopes as their strongest evidence for atmospheric oxygen.. All isotopes of sulfur behave the same chemically but have slightly different masses. Sulfur has four isotopes. About six years ago, researchers began measuring the abundance of these isotopes and determined their ratios in the natural world. These ratios are called mass dependent isotope fractionation and are the way sulfur fractionates today.. But rocks dating before ...

Euxinic conditions, which are defined by the presence of sulfide in the water column, were common in ancient oceans. However, it is not clear how the presence of sulfide in the water column affects the balance between rates of sulfide oxidation and sulfate reduction, which plays a major role in regulating the net redox state of the ocean-atmosphere system. Euxinia could lead to higher rates of sulfide oxidation because sulfide may diffuse more rapidly into the oxic zone in solution than in sediment. Alternatively, sulfide oxidation could be inhibited by low overall availability of suitable oxidants in euxinic settings. Here, we constrain rates of sulfide oxidation versus sulfate reduction in four euxinic water columns in coastal ponds by modeling the evolution of the concentration and sulfur and oxygen isotope compositions of sulfate from post-hurricane, well-oxygenated conditions to modern, euxinic conditions. The results of the one-dimensional, depth-dependent models of water column sulfate ...

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|p| The injection of a mixed toluene and D |sub|2|/sub| O (conservative tracer) pulse into a pristine mesoscale aquifer enabled a first direct experimental comparison of contaminant-specific isotopic fractionation from sorption versus biodegradation and transverse dispersion on a relevant scale. Water samples were taken from two vertically resolved sampling ports at 4.2 m distance. Analysis of deuterium and toluene concentrations allowed quantifying the extent of sorption (R = 1.25) and biodegradation (37% and 44% of initial toluene at the two sampling ports). Sorption and biodegradation were found to directly affect toluene |sup|13|/sup| C/ |sup|12|/sup| C breakthrough curves. In particular, isotope trends demonstrated that biodegradation underwent Michaelis-Menten kinetics rather than first-order kinetics.

Annual log contents - click on year to download PDF 2000 Snowball Earth; Milankovich forcing; millennial climate change; methane hydrate; clathrate bomb; silica micronutrient; Palaeocene-Eocene warming; climate cycles; Vostok ice core; iron and phytoplankton blooms. 2001 End-Archaean mantle overturn; Great Oxygenation Event; sulfur isotopes; onset North Atlantic Deep Water; thermohaline circulation; environmental change Africa; Phanerozoic…

In the present study, we applied the measurement of sCD36 in PCOS at baseline and during pioglitazone treatment. sCD36 showed fat mass-independent correlations with clamp-established measures of glucose and lipid metabolism, and increased sCD36 levels were significantly reversed during pioglitazone-induced increased insulin sensitivity. These results supported that sCD36 is an independent marker of insulin resistance in PCOS.. Our findings of significant correlations between sCD36 and measures of glucose metabolism and FFAs in PCOS patients and control subjects are in agreement with the results of Handberg et al. (9) in patients with type 2 diabetes. sCD36 levels were significantly decreased, whereas no significant changes were observed in central fat mass after pioglitazone treatment. Multiple regression analyses further supported the fat mass-independent correlation between sCD36 and insulin sensitivity. However, no direct measures of intra-abdominal and subcutaneous fat mass were available in ...

Sulfur and the Sulfur cycle, essential for life http://reasonandscience.heavenforum.org/t2433-sulfur-essential-for-life Sulfur is the third most abundant minera

Stable and radioactive isotopes are extensively used as tracers of numerous processes in the planetary and terrestrial environment. The relative abundances of isotopic species measured by their ratios

TY - JOUR. T1 - Post-entrapment Li isotope fractionation in melt inclusions from Volcan Jorullo, Mexico. AU - Kobayashi, Katsura. PY - 2008. Y1 - 2008. M3 - Article. VL - 72. SP - A261-A261. JO - Geochimica et Cosmochimica Acta. JF - Geochimica et Cosmochimica Acta. ER - ...

Top Supplements: The sulfur cycle transports oxygen across cell membranes and also assists in the HEALTHY regeneration of cells. The sulfur cycle in both...

Mineral Deposits and the Evolution of the Biosphere: Report of the Dahlem Workshop 1980, September 1-5 (Dahlem Workshop Report / Physical, Chemical and Earth Sciences Research Report) PDF By author Awramik, S.M., Button, A., Oehler, J.H., Williams, N., Babloyan last download was at 2016-01-25 30:15:26. This book is good alternative for MINERAL DEPOSITS AND SULFUR ISOTOPE ABUNDANCES IN THE MOUNT READ VOLCANICS BETWEEN QUE RIVER AND MOUNT DARWIN, TASMANIA. Download now for free or you can read online Mineral Deposits and the Evolution of the Biosphere: Report of the Dahlem Workshop 1980, September 1-5 (Dahlem Workshop Report / Physical, Chemical and Earth Sciences Research Report) book ...

This paper deals with stable isotope analysis on the children of the early Christian cemetery in Varnhem, Västergötland. Human bone and tooth material from the cemetery has been analysed for stable carbon, nitrogen and sulphur isotopes. The analysis showed that the diet had been homogeneous and that the children had been breastfed, with a possible exception of the child from grave 100.. ...

The metabolic fate of potassium dodecyl [35S]sulphate was studied in rats. Intraperitoneal and oral administration of the ester into free-ranging animals were followed by the excretion of the bulk of the radioactivity in the urine within 12hr., approximately 17% being eliminated as inorganic [35S]sulphate. Similar results were obtained in experiments in which potassium dodecyl [35S]sulphate was injected intravenously into anaesthetized rats with bile-duct and ureter cannulae. Analysis of urinary radioactivity revealed the presence of a new ester sulphate (metabolite A). This metabolite was isolated, purified and subsequently identified as the sulphate ester of 4-hydroxybutyric acid by paper, thin-layer and gas chromatography, by paper electrophoresis and by comparison of its properties with those of authentic butyric acid 4-sulphate. The identity of the metabolite was confirmed by isotope-dilution experiments. When either purified metabolite A or authentic potassium butyric acid 4[35S]-sulphate ...

The increasing number of metagenomic and genomic sequences has dramatically improved our understanding of microbial diversity, yet our ability to infer metabolic capabilities in such datasets remains challenging. |br| We describe the Multigenomic Entropy Based Score pipeline (MEBS), a software platform designed to evaluate, compare and infer complex metabolic pathways in large omic datasets, including entire biogeochemical cycles. MEBS is open source and available through https://github.com/eead-csic-compbio/metagenome_Pfam_score. To demonstrate its use we modeled the sulfur cycle by exhaustively curating the molecular and ecological elements involved (compounds, genes, metabolic pathways and microbial taxa). This information was reduced to a collection of 112 characteristic Pfam protein domains and a list of complete-sequenced sulfur genomes. Using the mathematical framework of relative entropy (H), we quantitatively measured the enrichment of these domains among sulfur genomes. The entropy of each

The increasing number of metagenomic and genomic sequences has dramatically improved our understanding of microbial diversity, yet our ability to infer metabolic capabilities in such datasets remains challenging. |br| We describe the Multigenomic Entropy Based Score pipeline (MEBS), a software platform designed to evaluate, compare and infer complex metabolic pathways in large omic datasets, including entire biogeochemical cycles. MEBS is open source and available through https://github.com/eead-csic-compbio/metagenome_Pfam_score. To demonstrate its use we modeled the sulfur cycle by exhaustively curating the molecular and ecological elements involved (compounds, genes, metabolic pathways and microbial taxa). This information was reduced to a collection of 112 characteristic Pfam protein domains and a list of complete-sequenced sulfur genomes. Using the mathematical framework of relative entropy (H), we quantitatively measured the enrichment of these domains among sulfur genomes. The entropy of each

Aug. 12, 2013 - MicroRNAs are endogenous small RNAs that play important roles as regulators of gene expression to affect processes such as growth in animals. All cells in the body have molecules called proteoglycan co-receptors at the cell surface. These molecules help the cells to receive signals from neighboring cells. This is important, as cells in the body need to communicate in order to behave properly. The proteoglycans bind to potent growth factors via their heparan sulfate polysaccharide chains (a form of carbohydrate), and these can be regulated by microRNA. Deregulation of heparan sulfate production has been linked to diseases such as cancer and aberrant blood vessel formation.. ...

High cost to extract sulfur from the mining processes can prove to be fatal for the sulfur market. In the year 2010, global production of sulfur was at 67.80 million tones and that of pyrites was 6.1 million tones.

TY - JOUR. T1 - High rates of anaerobic methanotrophy at low sulfate concentrations with implications for past and present methane levels. AU - Beal, EJ. AU - Claire, MW. AU - House, CH. PY - 2011/3. Y1 - 2011/3. N2 - Despite the importance of the anaerobic oxidation of methane (AOM) to global biogeochemical cycles, the relationship between sulfate concentration and the rate of AOM has not been previously experimentally constrained. Here, we present measurements showing substantial methane oxidation at low sulfate concentrations, with no significant decrease in the rate of AOM until sulfate levels are well below 1 mm. At sulfate levels below 1 mm, there appears to be a strong decoupling of AOM and sulfate reduction, with a 13C-label transferred from methane to carbon dioxide occurring at a rate almost an order of magnitude faster than the observed rate of sulfate reduction. These results allow for the possibility that high rates of AOM occurred in the Archean oceans and that high rates of AOM ...

The demonstration of CDO and SO protein and mRNA in human alveolar epithelial cells suggests that these enzymes are responsible for the production of sulfate in situ, which can then be converted to the substrate for phase II sulfotransferases or be used for the sulfation of structural components of the alveolus. Sulfate is present within the alveolus,13 as demonstrated by the expression of heparan sulfate and dermatan sulfate proteoglycans within the human alveoli,14,15 but there has been no direct measurement of sulfate production to date. The presence of the metabolic machinery for sulfate production in the epithelial cells of the alveolus, as shown in our study, does not prove conclusively that sulfate production actually occurs here. It is possible that PAPS, the sulfate carrier for sulfation reactions, may be transported to the lung after synthesis elsewhere in the body, but no evidence for this has yet been provided. However, the presence of sulfated proteins within the alveolus suggests ...

Jacquelines employment at NIST began with the measurement of sulfur concentration by isotope dilution thermal ionization for certification of fossil fuel (coal, diesel fuel, fly ash, gasoline, etc.) and other Standard Reference Materials (SRMs). This activity evolved into the development of a high-precision technique for the measurement of sulfur isotope composition of these and other environmental materials with sub-micromolar quantities of sulfur. More recently, measurements of moisture and other additional analytes including chlorine and mercury have been a part of her activities. Currently, she is also actively involved with learning new analytical techniques for isotopic measurements associated with the NIST Isotopic Reference Material Program. She has authored or co-authored 13 peer-reviewed publications describing these activities.. Awards:. ...

Sulphuric acid is an important factor in aerosol nucleation and growth. It has been shown that ions enhance the formation of sulphuric acid aerosols, but the exact mechanism has remained undetermined. Furthermore some studies have found a deficiency in the sulphuric acid budget, suggesting a missing source. In this study the production of sulphuric acid from SO2 through a number of different pathways is investigated. The production methods are standard gas phase oxidation by OH radicals produced by ozone photolysis with UV light, liquid phase oxidation by ozone, and gas phase oxidation initiated by gamma rays. The distributions of stable sulphur isotopes in the products and substrate were measured using isotope ratio mass spectrometry. All methods produced sulphate enriched in S-34 and we find an enrichment factor (delta S-34) of 8.7 +/- 0.4 parts per thousand (1 standard deviation) for the UV-initiated OH reaction. Only UV light (Hg emission at 253.65 nm) produced a clear non-mass-dependent ...

Holmer M, Hasler-Sheetal H (2014). Sulfide intrusion in seagrasses assessed by stable sulfur isotopes - A synthesis of current results. Frontiers in Marine Sciences 27 November 2014. DOI: 10.3389/fmars.2014.00064. Petersen JK, Hasler B, Timmermann K,Nielsen P, Tørring DB, Larsen MM, Holmer M (2014). Mussels as a tool for mitigation of nutrients in the marine environment. Marine Pollution Bulletin. 82:137-143. Hasler-Sheetal H, Holmer M (2015). Sulfide intrusion and detoxification in the seagrass Zostera marina. PloS One. DOI:10.1371/journal.pone.0129136. Hasler-Sheetal H, Fragner L, Holmer M, Weckwerth W (2015). Diurnal effects of anoxia on the metabolome of the seagrass Zostera marina. Metabolomics 1-11. DOI: 10.1007/s11306-015-0776-9. Castorani MCN, Glud RN, Hasler-Sheetal H, Holmer M (2015). Light indirectly mediates bivalve habitat modification and impacts on seagrass. Journal of Experimental Marine Biology and Ecology 472:41-53. DOI:10.1016/j.jembe.2015.07.001. Hasler-Sheetal H, Castorani ...

Savage NM, Sardsud A, Buggisch W (2006) late Devonian conodonts and the global Frasnian-Famennian extinction event, Thong Pha Phum, western Thailand. Palaeoworld 15:171-184 Simon L, Godderis Y, Buggisch W, Strauss H, Joachimski MM (2007): Modeling the carbon and sulfur isotope compositions of marine sediments: climate evolution during the Devonian. Chemical Geology (in press). Slavik L, Valenzuela-Rios JI, Hladil J,Carls P (2007) Early Pragian conodont-based correlations between the Barrandian area and the Spanish Central Pyrenees. Geological Journal, 42 (5), 499-512. John Wiley & Sons Ltd.,. Sumrall C, Brett CE, Cornell S (2006) The systematics and ontogeny of Pyrgopostibulla belli, a new edrioasteroid (Echinodermata) from Lower Devonian of New York. Journal of Paleontology. Tsujita CJ, Brett CE, Topor M, Topor J (2006) Evidence of high-frequency storm disturbance in the Middle Devonian Arkona Shale, southwestern Ontario. Journal of Taphonomy 4(2): 49-68. Turgeon S, Creaser R, Algeo TJ (2007) ...

article{58770751-98aa-4670-aede-8ddb9462c09c, abstract = {High precision isotopic measurements of Sn in two commercially available high purity materials and a previously analysed cassiterite from Straits Settlement, Malaysia, are presented as a basis for a new measurement procedure using the Micromass IsoProbe MC-ICP-MS. The results show that under optimised instrumental conditions two laboratory calibration standard solutions (Johnson-Matthey Puratronic Grade 1 Sn metal foil and Specpure ICP/DCP Sn solution) are isotopically identical and an external reproducibility of 0.000017 2 s. d. at 150 ppb Sn concentration (Sn-122/Sn-116 0.318597, n = 14) can be achieved. An isotopic fractionation of +0.13parts per thousand/ u (1.3 epsilon units) relative to these in-house standards has been verified for the cassiterite, which indicates a natural isotopic fractionation of approximately 2.8 times greater than the long-term reproducibility of the current optimised measurement procedure.}, author = ...

Proton Motion within Proton-Bound Dimers: H3O(+) .H2O ,=, H2).H3)(+), NH4(+).NH3 ,=, NH3.NH4(+) and CH5(+).CH4 ,=, CH4.CH5(+). A Kinetic Model for Isotope-Exchange Reactions, Int. J. Mass Spectrom. Ion Processes 1991, 109, 105; with D. Smith and N.G. Adams.. Isotope-Exchange Reactions as a Function of Temperature: Isotopic Fractionation in Interstellar Molecules, In Chemistry and Spectroscopy of Interstellar Molecules, D.K. Bohme, E. Herbst, N. Kaifu and S. Saito, Eds., University of Tokyo Press: Tokyo, 1992, pp. 251-253; with J.F. Paulson.. Gas-Phase Reactions of Weak Brønsted Bases II(-), PO3(-), HSO4(-), FSO3(-), CF3SO3H. with Strong Brønsted Acids H2SO4, FSO3H, CF3SO3H. A Quantitative Intrinsic Superacidity Scale for the Sulfonic Acids XSO3H (X = HO, F, CF3) J. Am. Chem. Soc. 1992, 114, 4299; with A.A. Viggiano, F. Dale, C.A. Deakyne and J.F. Paulson.. Rate Constants and Their Temperature Dependences. A Kinetic Description Using Simple Model Potential-Energy Surfaces, Angew. Chem., ...

Sulfur and sulfur compounds have a wide range of applications for their fluid, electrical, chemical and biochemical properties. Although low in abundance on the Moon (/approximately/0.1% in mare soils), sulfur is surface-correlated and relatively extractable. Co-production of sulfur during oxygen extraction from ilmenite-rich soils could yield sulfur in masses up to 10% of the mass of oxygen produced. Sulfur deserves serious consideration as a lunar resource. 29 refs., 3 figs. ...

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Name:C.I.Leuco Sulphur Black 2,C.I.53195 Molecular Structure: C.I.Leuco Sulphur Black 2,C.I.53195,CAS 1326-85-8,Sulphur Black 2R C.I.Leuco Sulphur Black 2,C.I.53195,CAS 1326-85-8,Sulphur Black 2R CAS Registry Number:61814-27-5

Pomme, d shydrat e (faible humidit ), sulfur e - Tout ce que vous devez savoir propos de laliment Pomme, d shydrat e (faible humidit ), sulfur e : Toutes les informations nutritionnelles de Pomme, d shydrat e (faible humidit ), sulfur e

Technical sulfur Lump, granulated sulfur. Sort sulfur 99.95 - 99.98. Loading big bags, bags with carrying capacity up to 1000 kg.

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Name:C.I.Sulphur Black 11,C.I.53290 Molecular Structure: C.I.Sulphur Black 11,C.I.53290,CAS 1327-14-6,Black CL Stabilosol,CL Stabilosol,Homodye Black RL-S C.I.Sulphur Black 11,C.I.53290,CAS 1327-14-6,Black CL Stabilosol,CL Stabilosol,Homodye Black RL-S CAS Registry Number:1327-14-6

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Constantly pushing forward new and improved sulfur technology, the Fluor Sulfur Technology group is one of the most skilled teams in the world.

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There are no known signs of deficiency, but arthritics are known to benefit from supplements containing chondroiton sulphates, thanks to sulphurs ability to draw fluid into cells in the joints. This has a lubricating effect, allowing the joints to move easily.

The decision to implement more stringent sulphur limits for marine fuel will require a significant change in practices of both vessel operators and oil refiners.

inventory at the storage pads. The project is to select, define and implement systems and facilities that will result in an increase of saleable sulphur export capacity.. The main elements consist of the following:. ...

The letters HPUS indicate that this ingredient is officially included in the Homeopathic Pharmacopœia of the United States.. ...