Journal Of Wassit For Science & Medicine

In this work, two novel, accurate and reliable spectrophotometric methods have been developed for the determination of pb(II) ion by complexion with the ligand N,N'-cyclohexane-l,2-diylidene-bis(4-methaxybenzoythydrazide (CHMBH). In this study, pb(II) ion was determined by the application of Zero order and first Derivative Spectrophotometric by measuring the amplitude at 258 nm, The linearity ranges for both methods were found to be 20–55 mg/l, Limit of Detection and Quantitation were found to be 0.33 mg/l and 1 mg/l for zero order and 1.438 mg/l and 4.360 mg/l for first derivative method respectively. Both methods have good accuracy found to be 99.594% and 100.497% respectively.

A theoretical studying was made to calculate the stopping power for (electron and positron) particles falling on some heavy, middle and light (isobars, isotones) nuclei. Calculated of the stopping power was made for (isobars, isotones) depending on the interaction (electron and positron) with a material by using Matlab language program depending on inductive mathematical theoretical methods, computational and design code to calculate the stopping power from (0.01- 0.1) MeV. A good agreement between experimental results and calculated stopping power computed by the program(work).

Bti-AgNPs tested againts Guppy fish and Daphina as non-target organisms. Bti was isolated from dead larvae of Culex quinquefasciatus mosquitoes in study places . Bti used to convert AgNO3 into nanoparticles biologically (Bti-AgNPs ) , used three concentrations from it (1000, 2000, 3000) ppm .The results was high mortality in fourth instar larvae of mosquitoes C.quinquefasciatus . Tested (6 ml / L , 8 ml / L and 10 ml / L) of Bti-AgNPs on Guppy fish and Daphnia as non-target organisms,The concentration of them was 10,000 ppm .The effect was negative on them. Bti non-nanoparticles tested on the same larvae as natural biocide , too its gave high mortality results.

The idea of this research is to find approximate solution of Linear Volterra Integro-Differential Equation (LVIDE) of the first order and second kind by using different degrees of the Touchard polynomials is presented. Because the simplicity definition applying this method will give high resolution results in low cost and short time, also can be easily differentiated, integrated and converge to an exact solution.
The algorithm and example given are to illustrate the solution in this way and compare it with the exact solution.

The study was undertaken to investigate the effect of neem oil that extracted from Azadirachta indica tree against the larvae of Culiseta longiareolata (Macquarrt) mosquito in all larval instars.The larvae were exposed to different concentrations of neem oil (0.001%,0.01%,0.1%,0.5% and 1%) for 24h and 48h under laboratory conditions.Neem oil was more toxic against 1st.larval instar and reached 90% mortality at concentration of 1% for 48h while the responds of 2nd.,3rd. and 4th. Larval instars were(86.66%,46.66% and 43.33%), respectively. The statistical results of LC50% value have been shown of the larvae: 1st.,2nd.,3rd. and 4th.instars were (0.713%, 0.748%, 1.588% and 1.797%), respectively. While the LC90% were (1.120%,1.169%,7.599% and 9.516%) , respectively with confidance limits (95%) within 24h . The lethal concentration was increased with larval stage. In the same period the LC50% of the 4th. larval instar is 2.52 times the LC50% of the 1st.larval instar, also the LC 90% is equivalent 8.49 times the LC90% of the 1st.larval instar. In 48 h, the LC50% of the 4th. larval instar is 2.61 times the LC50% of the 1st.larval instar, also the LC 90% is equivalent 7.53 times the LC90% of the 1st.larval instar.
The results of the statistical analysis(Gretl) showed a significant positive correlation with both levels (0.05 and 0.01) from significant between the mortality ratios of the larval stages and the concentrations used ,the peak was in the larvae of the first instar when the P-value = 0.0001.