Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 14 of 14 for “"dimethylsulfide"”.
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Marine microbial production of dimethylsulfide from dissolved dimethylsulfoniopropionate
Dimethylsulfide (DMS) plays a central role in the transfer of sulfur from the ocean to the atmosphere, and ultimately to land. The most abundant volatile organosulfur compound in seawater, DMS is believed to account for the bulk of the sea-to-air biogenic sulfur flux. DMS has also been implicated …
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Mechanistic, sensitivity, and uncertainty studies of the atmospheric oxidation of dimethylsulfide
The global-scale emissions and reactivity of dimethylsulfide (CH3SCH3, DMS) make it an integral component in the atmospheric sulfur cycle. DMS is rapidly oxidized in the atmosphere by a complex gas-phase mechanism involving many species and reactions. The resulting oxidized sulfur-bearing products …
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Marine microbial production of dimethylsulfide from dissolved dimethylsulfoniopropionate by Kathleen Mei Ledyard.
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 1993.
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Understanding the ocean carbon and sulfur cycles in the context of a variable ocean : a study of anthropogenic carbon storage and dimethylsulfide production in the Atlantic Ocean
… (DMSP) degradation and dimethylsulfide (DMS) production in the oligotrophic North Atlantic are investigated using potential enzyme activity and gene expression and abundance data. Vertical mixing and UV radiative stress appear to be the dominant mechanisms behind seasonal …
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Understanding the ocean carbon and sulfur cycles in the context of a variable ocean : a study of anthropogenic carbon storage and dimethylsulfide production in the Atlantic Ocean
… (DMSP) degradation and dimethylsulfide (DMS) production in the oligotrophic North Atlantic are investigated using potential enzyme activity and gene expression and abundance data. Vertical mixing and UV radiative stress appear to be the dominant mechanisms behind seasonal …
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Dominant substrates used by methanogens in hypersaline environments
… in hypersaline environments: methanol (MeOH); dimethylsulfide (DMS); monomethylamine (MMA); and acetate. As expected, high concentrations of TMA and MMA stimulated methane production to a greater extent than the controls across the entire salinity gradient sampled and there was also …
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Fluorinated boranes in dehydrocoupling and hydroboration
… of pentafluorophenyl-9-borobicyclo[3.3.1]nonane dimethylsulfide adduct, the –C6F5 substituted analog of the popular hydroboration reagent 9-BBN (9-borabicyclo[3.3.1]nonane).
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Periodic Mesoporous Organosilica: Preparation Characterization and Applications of Novel Materials
… to aryl aldehydes through ozonolysis with dimethylsulfide workup. Further transformation of the carbonyl functionality to an aryl imine showed a moderate level of success. Enantiomeric forms of a novel, chiral PMO precursor (CM) were synthesized and incorporated into biphenylene-bridged …
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Genetic analysis of DMSP metabolism in the marine Roseobacter clade
… and cleavage by DMSP-lyases, yielding volatile dimethylsulfide (DMS) plus acrylate. The DMSP-lyase, DddP, was purified from Roseovarius nubinhibens ISM and characterised in vitro. Nuclear magnetic resonance spectroscopy and gas chromatography confirmed bona fide DMSP lyase activity and mutation …
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Development and Evaluation of a Comprehensive Tropospheric Chemistry Model for Regional and Global Applications
… gas- phase chemistry includes a highly condensed dimethylsulfide (DMS) photooxidation mechanism, based on a comprehensive scheme available in the literature. The proposed DMS mechanism can successfully explain the observed latitudinal variation in the ratios of methanesulfonic acid to non-sea-salt …
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Towards scalable modern marine ecosystem monitoring
… act as persistent point sources of dissolved dimethylsulfide (DMS), with potential ecological and climatological implications, a finding only possible by sampling at colony scale rather than bulk water. This thesis coheres around three themes, model-informed design, scale-aware sensing, and …
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Genetic and Biochemical Analysis of Methyltransferase Gene Regulation in Methanosarcina Acetivorans C2A
… mediate regulation of other genes, such as three dimethylsulfide methyltransferase isozymes genes in M. acetivorans C2A. In conclusion, we showed that regulatory networks controlling expression of physiologically distinct isozymes might be beneficial to these organisms in Nature and might …
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The reaction of bis(thioether) complexes of (octaethylporphyrinato)ruthenium(II) with dioxygen, and the catalyzed O₂-oxidation of thioethers
… containing ≈ 20 mM of Ru(OEP)(dms)₂ (dms ≋ dimethylsulfide) and ≈ 12 mM PhCOOH, exposed to 1 atm of O₂ at room temperature, ¹H-nmr analysis shows that most of the Ru(OEP)(dms)₂ has oxidized to Ru(OEP)(dmso)₂ over a period of 35h. Three detected intermediates are identified as …
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Variabilité des concentrations cellulaires phytoplanctoniques de diméthylsulfoniopropionate (DMSP) et de diméthylsulfoxyde (DMSO) en Baie Sud de la Mer du Nord
The eutrophication of the Southern Bight of the North Sea has been benefitting to the prymnesiophyte Phaeocystis globosa (P. globosa). This species is a known high dimethylsulfoniopropionate (DMSP) producer whose bloom accounts for 95% of spring phytoplankton biomass. An increase in DMS(P) and its …