In biocatalytic conversions, substrates and products may display inhibitory or toxic effects on the biocatalyst. Rhodococcus erythropolis 1awq could further remove sulfur from hydrodesulfurized diesel oil, and the biodesulfurization was enhanced by the surfactant Tween 80. Tween 80 was shown to decrease the product concentration associated with the cells, reducing product inhibition.

Heretofore most methods for the determination of lipase activity have employed emulsions of fatty acid esters in water (1). These emulsions have been stabilized by use of such agents as gum acacia. The disadvantages of such methods are that (1) the emulsions break up to a considerable and variable extent during the course of the incubation, and (2) the enzyme is presumed to be in the aqueous ph...

The current increase in the vast amount of marine crustacean shell waste produced by the fish processing industries has led to the need to find new methods for its disposal. Hence, the present study was carried out via marine shell wastes as substrate for protease production. The maximum production (4000.65 U/ml) from Bacillus sp. APCMST-RS3 was noticed in 3:1% shrimp and oyster shell powder (S...

OBJECTIVE The link between childhood obesity and both television viewing and television advertising have previously been examined. We sought to investigate the frequency and type of food and beverage placements in children-specific television broadcasts and, in particular, differences between programme genres. METHOD Content of five weekdays of children-specific television broadcasting on bot...

Production of manganese-dependent peroxidase (MnP) by the white-rot fungus Phanerochaete chrysosporium BKMF-1767 (ATCC 24725) was monitored during growth in different media and growth conditions. The effect of some activators of MnP production, Mn, Tween 80, phenylmethylsulphonylfloride (PMSF), oxygen, temperature, pH, glycerol and nitrogen was studied. Supplementing the cultures with Tween 80 ...

A medium for the selective isolation and enumeration of Mycobacterium avium-intracellulare and M. scrofulaceum (MAIS) was developed, based upon the ability of these mycobacteria to utilize Tween 80 as sole carbon source and grow optimally at pH 5.5 on a simple mineral salts medium. Representative MAIS strains had higher efficiencies of plating on the Tween 80 medium compared with Middlebrook 7H...

In this study, the effect of surfactants (Tween-80 and Acetonitrile) inclusions in the culture medium of Bacillus subtilis on the yield and characteristics of extracellular protease was investigated. The results showed that addition of Tween-80 increased the enzyme yield by 5 folds and thermal stability from 50C to 60C. Tween-80 did not affect the optimum pH, KM and VMax values as well as the e...

This study investigated the preparation of stable conventional heavy crude oil-in-water (O/W) emulsions by mechanical homogenization with addition a non-ionic surfactant, Tween-20. A four-factor, five-level central composite design was carried out to investigate effects four independent variables, including mixing intensity (4,000–10,000 rpm), duration (5–45 min), water salinity (0–40 g/L), and...