Alkaline/surfactant/polymer (ASP) flooding has been extensively applied to enhancing oil recovery. As an oil displacement agent, pe1troleum sulfonate (PS) is widely used in ASP pilot experiments. It is very important to find a petroleum sulfonate with a high interfacial activity and low adsorption loss. Anionic surfactant petroleum sulfonate is synthesized in a single-tube film sulfonation reac...

We report the effect of Stryphnodendron adstringens on the trypanosomatid Herpetomonas samuelpessoai. The parasites were grown at 28 degrees C in a chemically defined medium containing crude extract and fractions at concentrations from 100 to 5000 microg/ml obtained from S. adstringens. Concentrations of 500, 1000, 2500, and 5000 microg/ml both crude extract and semi-purified fraction progressi...

This study aimed to evaluate the cytotoxicity of a crude extract of Piper cubeba against normal and breast cancer cell lines. To prepare the extract, P. cubeba seeds were ground, soaked in methanol and dichloromethane and isolated by column chromatography. Fractions were tested for cytotoxicity effects on normal fibroblast (L929), normal breast (MCF-12A) and breast cancer cell lines (MCF-7, MDA...

Isolation of immunodiagnostic fraction from Strongylus vulgaris adult worms was described by CNBr-Sepharose 4B affinity column chromatography. The isolation process resulted in a fraction with 2161.5 fold increase in binding activity compared to its crude extract. Characterization of the isolated fraction by SDS polyacrylamide gel electrophoresis and isoelectric focusing showed that the fractio...

A crude cell wall fraction of Listeria monocytogenes was prepared by sonic disruption and differential centrifugation of viable, washed cultures. When injected into mice, this sterile, crude cell wall fraction protected mice against an intraperitoneal challenge with 18 to 85 50% mean lethal dose of L. monocytogenes. Resistance was greatly enhanced when bacterial endotoxin (lipopolysaccharide) w...

The crude enzyme fraction was isolated from the fresh unripe fruits of Momordica charantia Linn and screened for its amylolytic and lipolytic activity according to standard literatures. The results indicated that the crude enzyme fraction is having effective amylolytic and lipolytic activities. These enzymatic activitieis of the extract substantiate the validity of claims made in traditional sy...

In recent years, acyl dihydroxyacetone phosphate [acyl-DHAPt) has been shown to be a precursor of glycerolipids and glycerol-ether lipids.'.' Acyl-DHAP was discovered as a rapidly labeled lipid that was formed in crude mitochondrial fraction from 3'Pi or y-32P[ATP].3 This rapid labeling was due to the enzymatic dephosphorylation and rephosphorylation of endogenous acyl-DHAP present in the crude...