M.Sc.

   The aim of this study was to initiate callus from black seed Nigella sativa to extract thymol substance and then study its potency to inhibit the  cytogenetic effects of mitomycin-C (MMC) on laboratory mice (in vivo).  Establishment of  Nigella sativa (black seed) seedlings in tissue culture was achieved in our laboratory by using Murashige and Skoog medium, (1962) (MS) and optimization of cultural medium using a combination of  2,4-D and Kin concentrations The seeds were cultured in sterilized distilled water (after their steriliza

         The present study was carried out to shed light on the chemical analysis of Glycyrrhiza glabra for different active compounds, and on the cytogenetic effects of methotrexate(MTX) and aqueous extract of G. glabra in laboratory mice  (in vivo) and human blood lymphocytes (in vitro). The study also aimed to investigate the role of G.

       Six bacterial isolates (four of them belonging to Pseudomonas aeruginosa and the other two were belonged to Pseudomonas spp.) isolated previously, were identified and/or ensured their identification. Results showed that these isolates were belonged to P.