Showing papers on "Guar gum published in 1974"
TL;DR: In this article, small quantities of certain polymers dissolved in a liquid can reduce considerably the frictional drag exerted by the liquid when it flows over a surface, where the concentrations required are of the order of a few parts per million.
Abstract: SMALL quantities of certain polymers dissolved in a liquid can reduce considerably the frictional drag exerted by the liquid when it flows over a surface. This effect has been observed with various solvent/polymer combinations, but most investigations involve polyethyleneoxide (PEO), polyacrylamide or guar gum in water, where the concentrations required are of the order of a few parts per million.
42 citations
Patent•
10 Oct 1974
TL;DR: In this article, a subterranean formation is treated by injecting into the formation an aqueous acid solution comprising a water soluble vinyl compound, a natural gum (preferably guar gum or gum karaya), and finely divided particulate material (preferredably silica sand).
Abstract: A subterranean formation is treated by injecting into the formation an aqueous acid solution comprising a water soluble vinyl compound (preferably polyvinyl alcohol or polyvinylpyrrolidone), a natural gum (preferably guar gum or gum karaya) and finely divided particulate material (preferably silica sand).
28 citations
TL;DR: A study of the hydrolyzability of α-d-galactoside, α- d-fucoside and β-l-arabinoside showed that the presence of primary alcoholic group in the sugar was important for faster hydrolysis and a stronger binding.
Abstract: α-Galactosidase from Lens esculanta (red lentils) was purified 4090-fold through a multistep process involving acidification, ammonium sulphate fractionation, Sephadex gel filtration, DEAE-cellulose and CM-cellulose chromatography. The purified enzyme is stable at 4°C for nearly six months with only a small loss of activity. It showed a pH optimum of 5.5 with raffinose as the substrate and 6.0 with p-nitrophenyl-α-d-galactoside. The Km for the former substrate was 40 mM and for the latter, 0.26 mM.
The enzyme failed to liberate galactose from guar gum, tara gum and locust bean gum galactomannans. A study of the hydrolyzability of α-d-galactoside, α-d-fucoside and β-l-arabinoside showed that the presence of primary alcoholic group in the sugar was important for faster hydrolysis and a stronger binding. The substrate specificity studies indicated the absence of any related glycosidase activity in the α-galactosidase preparation.
16 citations
TL;DR: It is suggested that the technique of immobilization, where the functional group of a glycoprotein lectin remains available for its biological activity, could prove an important tool for the study of receptor hormone and antibody-antigen interactions.
12 citations
TL;DR: In this paper, the effect of variations in temperature and sodium chloride concentrations on drag reduction by sodium carboxymethylcellulose and guar gum was studied with water in turbulent flow, using a simple flow tube.
4 citations
TL;DR: Etude des aptitudes technologiques de gomme guar, a differentes concentrations, de gelatine and d'alginate de sodium ; effet sur la viscosite, les proprietes rheologiques et organoleptiques des cremes glacees as discussed by the authors.
Abstract: Etude des aptitudes technologiques de gomme guar, a differentes concentrations, de gelatine et d'alginate de sodium ; effet sur la viscosite, les proprietes rheologiques et organoleptiques des cremes glacees
1 citations