The work describes the production of alkaline protease in a lab scale fermentor from Bacillus subtilis IH-72. The production of alkaline protease was enhanced by optimization of cultural conditions in a stirred fermentor. The alkaline protease so produced was applied to the goat skin for the removal of hair. The skin pieces were treated in three different ways; singly with the enzyme, in combin...

Continuous flow hydrothermal synthesis offers a cheap, green and highly scalable route for the preparation of inorganic nanomaterials which has predominantly been applied to metal oxide based materials. In this work we report the first continuous flow hydrothermal synthesis of metal sulphide nanomaterials. A wide range of binary metal sulphides, ZnS, CdS, PbS, CuS, Fe(1-x)S and Bi2S3, have been...

UNLABELLED This case series details clinical observations in 7 survivors of accidental hydrogen sulphide inhalation toxicity at a petroleum refinery in Sri Lanka. One survivor developed status epilepticus and severe neurotoxicity whilst another survivor developed delayed respiratory failure; both patients required intensive care management. One victim manifested mild bronchospasms in the immedi...

The most important examples of magmatic ore deposits in volcanic rocks are Fe-Ni-Cu-(PGE) sulphides associated with Archean and Proterozoic komatiitic lava channels (Lesher, 1989). Komatiitehosted ores contain ~25% of the world’s nickel sulphide resource (≥ 0.8% Ni), including significant amounts of copper and platinum group elements (Ross and Travis, 1981). Field, experimental, and theoretical...

The historically productive copper-bearing Besshi-type sulphide deposits in the Japanese accretionary complex were formed as volcanogenic massive sulphide deposits on the deep-sea floor of the Panthalassa Ocean. Here we report that eleven typical Besshi-type deposits yielded Re-Os isochron ages around 150 Ma (148.4 ± 1.4 Ma from the composite isochron) in Late Jurassic time. This date coincides...

The massive sulphide deposit at Kantienpan Cu-Zn mine is hosted by volcano sedimentary succession known as the Areachap Group, in the eastern part of Namaqua Metamorphic Province, South Africa. The deposits were affected by a complex deformation and metamorphic history and represent examples of upper amphibolite to granulite grade metamorphosed volcanic-hosted m...

In this research, selective flotation of Mo from the Sungun Cu-Mo concentrate was evaluated in different operating conditions. It was found that the addition of 16 kg/t Na2S into flotation pulp and aeration decreased rapidly the initial oxidized- reduction potential (ORP) of the pulp from +228mV to -597 mV (with reference to standard Ag/AgCl electrode) and increasing the amount of Na2S by 50kg/...

ball mills are common grinding equipment in mineral processing industries. ball wear results from three mechanisms namely impact, abrasion and corrosion. of these, the corrosion mechanism is the least investigated, due to its chemical-electrochemical nature. therefore, the aims of this research were to investigate the grinding chemistry influence (slurry ph, solid percentage, water chemistry an...

Ridgeia piscesae Jones, 1985, is the only vestimentiferan tubeworm species at the Juan de Fuca Ridge of the northeast Pacific, yet the range of sulphide microhabitats it populates and tube morphologies it expresses resemble those of other vestimentiferan tubeworm genera known at hydrothermal vent and deep-sea hydrocarbon seep sites throughout the world. Initially, two species of Ridgeia were fo...

Sulphur mustard, [bis (2-chloroethyl)] sulphide (SM), is a bifunctional alkylating agent. SM forms sulphonium ion in the body which alkylates DNA and several other macromolecules, and induces oxidative stress. Although several antidotes have been screened for the treatment of systemic toxicity of SM in experimental animals none of them are recommended so far. In the search for more effective an...