Scientific Activities Rsearch Monitoring And Determination of Heavy Metals as Pollutants in Tomato Agricultural Greenhouse Soils at Zilfi ProvincResearches Measurements of Some Trace Elements in Street Dust inZilfi Province at Saudi Arabia Using Inductively CoupledPlasma-Mass Spectrometer Some Trace Elements in Zilfi Streets Dust Determination of Some Heavy Metals in Raw Petroleum Wastewater Samples Before and After Passing on Australis Phragmites Plant Effect of Diethylamine on Physicochemical Properties of Reformat Gasoline EFFECT OF X-RAY RADIATION ON SOME PHYSICOCHEMICAL CHARACTERISTICS OF DIESEL FUEL Uses of some monomers and polyamides of aminodibenzo-18-crown-6 in solid-liquid extraction of potassium permanganate, dichromate, chromate, thiocyanate and nitrate Spectroscopic Determination of Some Trace Elements as Pollutants in Fruit Dates Palm and Agricultural Soils at Zilfi Province Preparation of some polyamides of diaminodibenzo-18-crown-6 and studying their liquid crystalline properties Assessing silicon deposits in Zilfi province, Saudi Arabia, using XRF and XRD techniques