EFFECTS OF KATHON, A CHEMICAL USED WIDELY AS A MICROBICIDE, ON THE SURVIVAL OF TWO SPECIES OF MOSQUITOES





SULPHIDE MINERALIZATION IN UPPER WESTPHALIAN COAL SEAMS FROM THE EASTERN PART OF THE UPPER SILESIAN COAL BASIN

Morphologically diversified sulphide mineralization has been found in Welding Helmet Accessory No.301 and 302 coal seams (Westphalian B).The main sulphide is pyrite which forms veinlets cross-cutting the sedimentary fabrics of the coal, encrusts the cellular structures and intergrowths with oxysulphides.Two generations of pyrites were observed: the

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