or ZnO comparison, we report here the dielectric and magnetic properties of PrBa₂Cu_3-3xAl_3xO_y (Al:Pr123) samples with (0.00 ≤ x ≤ 1.00). The dielectric constant (ε′), ac electrical conductivity (σ_ac) and F-factor were decreased as x increased to 1.00, but the q-factor was increased. As compared to ZnO, the x ≤ 0.05 samples show higher values of ε′, σ_ac and F-factor, as well as q-factor, but at x ≥ 0.10. In addition, the binding energy was increased from 0.423 to 0.672 eV as x increased to 0.30, but above that it significantly enhanced until reach to 38.825 eV. The Cole-Cole plot shows a complete circle for the samples of x ≤ 0.05, and semicircular arcs for the x ≥ 0.10 and ZnO. Moreover, the impedance of grain and grain boundaries is significantly increased as x increases to 1.00, but they are lower than of ZnO. Although ZnO exhibits poor ferromagnetic behavior, the Al: Pr123 samples show strong ferromagnetic behavior with evaluated magnetization parameters. Moreover, these outcomes strongly recommend the Al: Pr123 samples, better than ZnO, for the devices of integrated circuits, solar cells, super-capacitors and spintronics.

Proteases play a critical role in many industrial applications. The most important advantage of microbial proteases is that they can tolerate harsh industrial conditions. In this study, 17 bacterial strains were isolated from different milk products. The bacterial isolates were screened for their capabilities to produce protease enzyme in normal and alkaline conditions with pH values 7.4 and 9.4 on skimmed milk and casine agar plate respectively at 30°C. The enzyme index (EI) for protease was measured for the highly protease producer strains in normal and alkaline media (1.6±0.02,1.4±0.1,0.9±0.05 in nomal medium but 2.2±0.04, 2.5±0.06, 1.7±0.04 in alkaline medium for ASU2,ASU1,Sm-26 respectively). Biochemical tests were performed for the highly protease producer isolates. Genetically identification of bacteria was carried out through 16S rRNA gene sequencing. The current results indicated that the highest protease-producing bacterial strains were Bacillus subtilisAUS2 , Bacillus tequilensis AUS1, and Serratia marcescens. This study emphasized the necessity of utilizing microorganisms as promising enzyme producers employed in several industrial applications.