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Showing 1 to 20 of 408 for “"sulphur"”.
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The Polymerisation of Sulphur containing Heterocycles
A number of α-thio-carboxylic acid anhydrocarboxylates and α-thio-carboxylic acid anhydrosulphites have been synthesised by the reaction of the parent α-thio acids with carbonyl chloride (COCL2) and thionyl chloride (SOCL2) respectively. The base-initiated decomposition of the …
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Keeping Up Appearances: Cosmetics in Sulphur, Nevada
Sulphur, Nevada is an abandoned mining settlement in northwestern Nevada that was settled in the early 20th century. Archaeological work conducted at the site in 2009 and 2010 revealed the presence of an unusual number of beauty-related artifacts, including artifacts related to skin and hair care. …
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Mechanisms of Action of Sulphur Containing Antioxidants
… with the antioxidant chemistry of two classes of sulphur-containing antioxidants. Part A is concerned with the sulphoxide dimethylsulphinyldipropionate (DMSD) and its reaction with hydroperoxide. Its activity as a peroxide decomposer is explained in terms of catalytic activity of certain of its …
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Machine learning force fields for elemental sulphur
The sulphur phase diagram is one of the most complex ones of all elemental systems, competing with that of carbon. The flexibility of the bonds allows for a variety of motifs: rings of 5 or more atoms in various conformations, short diradical chains and thousands-atoms long polymers to name a few; …
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Sulphur sorbent particle effects in fluidised combustion
… process model is presented for the capture of sulphur dioxide by calcareous sorbents in a fluidised bed combustor for a feed of arbitrary size distribution. The description of sorbent sulphation kinetics, particle attrition and elutriation effects incorporated in this model is supported by …
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Oxygen and sulphur heterocycles derived from chloroaldehydes
… chloralide is formed from chloral and fuming sulphuric acid, has been elucidated using 13C-labelling. The dehydrochlorination of chloralide under unexpected conditions, is also discussed. The isomerism in a series sulphur-containing analogues of parachloral was investigated. …
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Analysis of transcription factors under sulphur deficiency stress
Sulphur, a macronutrient essential for plant growth, is among the most versatile elements in living organisms. Unfortunately, little is known about regulation of sulphate uptake and assimilation by plants. Identification of sulphate signalling processes will allow to control sulphate acquisition …
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Biochemistry of sulphur-containing amino acids in trichomonads
No abstract available.
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A structural investigation of the mercury-sulphur interaction
… The interaction between mercury and sulphur is investigated. This interaction is of interest both biochemically and toxicologically. More specifically, secondary Hg---S interactions are found to mimic that observed in NMR exchange processes, where they undergo a transition state as a …
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Characterization of an extremely thermophilic, anaerobic sulphur-dependent archaebacterium
The sulphur-dependent archaebacterial isolate ANI was studied in aspects of its ecology, physiology, and enzymology. Organisms closely resembling isolate ANI were enriched from New Zealand hot pools within a temperature range of 55-91°C and a pH range of 5.5- 9.0 and a sodium content above 0.5g/ℓ. …
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Evaluation and Mechanism of Sulphur-Bound Antioxidants in Rubbers
A quantitative study of the extent of the reaction between the hindered phenolic antioxidant 3,5-di-tertbutyl-4-hydroxyphenyl methane thiol (BHBM) and natural rubber latex, showed that this was low, due to naturally occurring non-rubber constituents. In SBR latex, much higher levels of binding were …
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The synthesis and reactions of sulphur analogues of deoxyvasicinone
… of anthranilic acid with appropriate sulphur containing lactams, in the presence of phosphoryl chloride. The quinazolinones (A) and (B) were shown to react (at the methylene group alpha to the carbon-nitrogen double bond) with a variety of electrophiles at elevated temperatures. …
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Sulphur dioxide oxidation mechanism on Pt surfaces : a DFT study
… processes utilised to produce H2, is the Hybrid Sulphur (HyS) cycle wherein sulphur dioxide (SO2) and water (H2O) is thermo-electrochemically converted into sulphuric acid (H2SO4) and H2. Platinum (Pt) has proven to be an efficient catalyst for the HyS cycle, producing a high purity of H2. …
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Metal complexes of selected organic ligands containing sulphur and phosphorus
… the study of the chelating properties of six sulphur and oxygen ligands and five phosphoryl sulphur and oxygen ligands with nickel(ll) and coba lt(ll) halides. Thirty two complexes of nickel(II) and cobalt(ll) halides were prepared and are reported in this thesis. The ligands used in the …
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