From the resin of Shorea robusta several known ursane and oleanane derivatives were isolated. In addition, a new triterpene acid, 2alpha,3beta,23-trihydroxy-11beta-methoxy-urs-12-en-28-oic acid, was isolated. The structure ...

The extraction of copper(II) from its solutions containing varying amounts of ammonium sulphate (1-4 M) over a pH range of 2 to 10 using Hostarex DK-16 in kerosene has been studied. Extraction seems to be less at higher ...

The presence of turbulence promoters in an electrochemical cell increases the intensity of local turbulence which augments limiting current density/mass transfer coefficient at the transfer surface. The level of augmentation ...

The shade of synthetic iron oxides varies with experimental conditions. Generally, lighter reds are obtained when alpha-FeOOH is the precipitated entity and darker (bluish) reds are obtained when the entity is gamma-FeOOH ...

A rapid and highly sensitive complexometric in presence for the determination of La and Co or Mn in presence of each other mixed metal oxide catalysts has been described. Ammonium fluoride has been used to mask lanthanum.