In this research effect of Azadirachta indica (Juss) seed extract upon predator ciliates in intensive unicellular algal mass culture of Dunaliella tertiolecta (Butcher) under laboratory condition were studied. For this propose, LC 100 of ciliates and EC 50 algae in the optimum Lab. condition were examined. Results show that a 24-h LC 100 at 4mg/l seed extract was found for the ciliate whereas at 24h EC50 10 mg/l had the best result for the ciliate. But at investigation of seed extract effect upon the of unicellular algae and ciliate both to gathers at one contaminated sample show that The application dose for use of this extract with useful effect in completely elimination of ciliates is over than 4 - 5 mg/l. Finally study in long time effect of seed extract upon the mortality, motion and body shape of algae cells showed that this extract is able to recover contaminated algal population and had no harmful effect on the algae cells at 72 hour.

In this investigation kinetics and mechanism of NH3 synthesis over Fe(100)and K/Fe(100)model catalysts have been studied. In this context, adsorption kinetics of both N2/Fe (100) and H2/Fe (100)systems is initially investigated. By using statistical mechanic approach, we have determined the adsorption coefficient for N2 and H2 molecules as well as transition probability of different states of adsorption and dissociation of the reactants molecules. The effect of surface catalyst temperature on the reaction rate (TOF) is studied under different reactant partial pressures. The mechanism of NH3 synthesis is suggested based on LH surface reactions model. According to the obtained results, activation energy for the reaction over Fe (100)and K/Fe(100)(for θK=0.1ML) was determined 19.6 and 11.1 kcal/mole, respectively. The order of reaction on both catalysts with respect to pN2 and PH2 was unity and negative, respectively. Based on our data analysis, the NH3 synthesis obeys Temkin isotherm.