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 12 of 12 for “"Dimethyl sulphide"”.
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Investigating the controls on surface ocean dimethyl sulphide concentrations at regional to global scales
… relevant, biogenic sulphur compound, dimethyl sulphide (DMS) at regional to global scales. The primary focus is upon the role of solar irradiance and metrics of biological activity in modulating DMS concentrations using bivariate and multivariate statistical techniques in conjunction …
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Production of Dimethyl Sulphide (DMS) by Scleractinian Coral during Aerial Exposure – Effect of Temperature and Light
In this thesis I investigated how rates of DMS production in three Scleractinian corals were affected by both aerial exposure and different light and temperature regimes. Coral specimens were acclimated over a 1 month period prior to data collection. Gas samples were collected from corals both …
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A study of activated ketal reduction with borane dimenthyl sulphide
… of a novel reagent combination, namely borane dimethyl sulphide and trimethylsilyl trifluoromrthanesulphonate (TMSOTf) for reductive ketal cleavage.
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Effectof feed rations on livestock performance and impact of effective microorganisms on litter odour and other gases emissions.
… in week 3 compared to the controls. However, dimethyl sulphide and dimethyltrisulphide were not mitigated by the use of EM hence further methods on how to mitigate these sulphurcompounds need to be explored. A 10% dose of EM for cattle litter treatment was preferred, sincethe effect of higher …
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Methane sulphonic acid as a tracer for non sea salt sulphate: implications for global climate regulation
… cited as a useful tracer of oceanic emissions of dimethyl sulphide (DMS), Mulvaney et al., 1992. MSA is the second mo t important oxidation product of DMS, but unlike the main product, sulphate, it's only major ource is the marine precursor compound. Given the potential importance of marine …
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On the molecular diversity of dimethylsulphoniopropionate catabolism by marine bacteria
Dimethylsulphoniopropionate (DMSP) is the most abundant organic sulphur molecule in the oceans. Its breakdown by marine organisms is important for the global cycling of sulphur, and as a nutrient source for microbial life. In recent years, the molecular basis of DMSP catabolism by marine bacteria …
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A kinetic and spectroscopic study of chemistry relating to the atmospheric role of iodine species
… the reaction kinetics of the reaction of 10 with dimethyl sulphide (DMS) was investigated. The results obtained have led to a re-evaluation of the atmospheric significance of this reaction. The data obtained assist the development of our knowledge of the atmospheric chem istry of iodine species …
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Arctic Aerosol Sources and Continental Organic Aerosol Hygroscopicity
… with high atmospheric and ocean surface dimethyl sulphide (DMS) concentrations suggesting that the aerosol formed from oceanic sources. An aerosol microphysics box model confirmed that local DMS could have produced the observed particles. In addition, the particle chemical composition was …
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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
… responsible for seasonal variability in dimethylsulfoniopropionate (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 …
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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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AN INVESTIGATION OF THE FEASIBILITY OF BIOMETHYLATION FOR GROUP IV METALS AND COMPOUNDS
… a dismutation reaction of the bis trimethyllead sulphide formed by the reaction of trimethyllead species in the presence of biologically produced free sulphide ions. Preparation of bis trimethyltin sulphide, and reaction with artificial daylight radiation proved that the same applies to …
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Insights into marine biological responses to Icelandic glacial outburst floods from remote sensing data
Cryospheric change has altered discharge patterns of the subglacial Skaftá cauldrons and Grímsvötn volcano beneath the Vatnajökull ice cap, SE Iceland (64.4220° N, 16.7902° W) at least since 1940. Jökulhlaup (glacial outburst floods) frequency has increased but their magnitude has decreased. This …