Results 131 to 140 of about 1,788 (179)

Superlubricity of molybdenum disulphide

Physical Review B, 1993
We have studied the atomistic origins of the ultralow friction coefficient of a molybdenum disulphide (${\mathrm{MoS}}_{2}$) coating in ultrahigh vacuum conditions. A friction coefficient in the ${10}^{\mathrm{\ensuremath{-}}3}$ range is associated with friction-induced orientation of ``easy shear'' basal planes of the ${\mathrm{MoS}}_{2}$ crystal ...
, Martin, , Donnet, , Le Mogne T, , Epicier   +3 more
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Photolysis of Organic Disulphides [PDF]

Nature, 1948
THE reactions following light absorption by pure organic disulphides in solution have not been studied, although the reactions are of great importance in the chemistry of wool, affecting both felting and shrinkage of the wool1,2. Similar reactions occur in irradiated milk3 and in petrol4.
exaly   +3 more sources

Determination of thiuram disulphides and analysis of thiuram disulphide-dithiocarbamate mixtures

Talanta, 1982
Potassium trithiocarbonate is used as reluctant for the titrimetric determination of thiuram disulphides in dimethylformamide-water media. The method is based on reductive cleavage of the disulphide linkage to yield the corresponding dithiocarbamates. In visual titrations, the end-point is marked by appearance of a yellow colour with the first drop of ...
B C, Verma, H S, Sidhu, R K, Sood
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Efficient catalysis of disulphide bond rearrangements by protein disulphide isomerase

Nature, 1993
Protein disulphide isomerase (PDI) is a highly abundant and ubiquitous eukaryotic protein that is essential for viability in yeast. Although PDI is thought to catalyse disulphide bond formation and isomerization during protein biosynthesis, PDI has been found previously to have only moderate effects (approximately 25-fold) on the rate of oxidative ...
J S, Weissman, P S, Kim
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Comparative haemolytic activity of bis(phenylmethyl) disulphide, bis(phenylethyl) disulphide and bis(phenylpropyl) disulphide in rats

Food and Chemical Toxicology, 2003
Thiols and disulphides make an important contribution to the organoleptic characteristics of foodstuffs, and many such compounds are approved for use as food flavours. Some thiols and disulphides are haemolytic agents in vivo. The haemolysis is caused by oxidative damage to erythrocytes initiated by "active oxygen" species formed during redox cycling ...
R, Munday, J S, Munday
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A Disulphide Interchange Reaction

Nature, 1953
In experiments designed to determine the position of the —S—S— bonds in insulin, cystine peptides were separated from a partial acid hydrolysate, and their structures determined after oxidation to the corresponding cysteic acid peptides. It was found that many more cystine peptides were present than could be accounted for by any one unique structure ...
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Molybdenum Disulphide

Scientific Lubrication, 1959
MOLYBDENUM DISULPHIDE has been developed as a commercial lubricant during the last ten years and since it is a material which is quite different in nature from other bodies used in lubrication, it is not surprising that misconceptions regarding its properties often arise. Criticisms are made at times which have no real justification but, like all false
C.J.C. Vineall, Alan Taylor
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Determination of thiocarbamyl sulphenamides, thiuram disulphides and dibenzothiazyl disulphide by amperometric titration

Talanta, 1981
An amperometric method for the determination of thiocarbamyl sulphonamides has been developed, based on the cleavage of the S-N bond by hydriodic acid. The method can also be applied for the cleavage of the S-S bond in thiuram disulphides and dibenzothiazyl disulphide, and thus provides a useful means for the estimation of these compounds as well.
D K, Basu, B, Adhikari, D, Pal, A K, Chaudhuri   +3 more
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Catalysis by protein-disulphide isomerase of the unfolding and refolding of proteins with disulphide bonds

Journal of Molecular Biology, 1980
Abstract Purified protein-disulphide isomerase has been examined for effects on the pathway and kinetics of the unfolding and refolding which accompanies disulphide bond breakage and reformation in bovine pancreatic trypsin inhibitor and bovine ribonuclease A.
T E, Creighton, D A, Hillson, R B, Freedman   +2 more
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Increase in hepatic mixed disulphide and glutathione disulphide levels elicited by paraquat

Biochemical Pharmacology, 1982
Paraquat (1 mM), when added to isolated haemoglobin-free perfused rat liver, leads to an increase of intracellular mixed disulphides from 1.3 mumole GSH equivalents per g wet weight in the controls to 2.5 mumole/g. This raises the proportion of mixed disulphides to total glutathione equivalents from about 0.2 at the beginning of the perfusion to about ...
R, Brigelius, R, Lenzen, H, Sies
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