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Articles by Nermeen A. El-Sersy
Total Records ( 2 ) for Nermeen A. El-Sersy
  Nermeen A. El-Sersy and Ebaa E. El-Sharouny
  The biosorption of nickel ions on marine Bacillus subtilis N10 free cells and immobilized cells on different porous solid supports has been studied in batch experiments to determine the effect of cell immobilization on metal accumulation. The influence of medium composition on the biosorption activities of these bacterial strains was investigated by the application of Plackett-Burman experimental design. Optimization results represents about 1.2 fold increase in Ni2+ uptake when compared with the control basal culture. Moreover, optimized cultures containing adsorbed cells on pumice particles showed the highest Ni2+ uptake.
  Gehan M. Abou-Elela , Nermeen A. El-Sersy , Mohamed A. El-Shenawy , Hanan Abd-Elnabi and Hassan A.H. Ibrahim
  The microbial community associated with mangrove plant (Avicennia marina) in Safaga (Red Sea) was studied, the heterotrophs (TVC), Vibrio, Aeromonas and Staphylococcus counts in sea water were 56000, 200, 300 and 160 cfu mL-1, respectively. The mangrove stems harboured lower values and the roots harboured higher values. The dominant heterotrophs isolated from the roots and stems were: Bacillus, Vibrio, Aeromonas and Pseudomonas. Different extracts of the different parts of the plant (seeds, leaves, stems and roots) were applied on different bacterial pathogens such as: P. aeruginosa, V. fluvialis, V. vulnificus, S. faecalis, E. coli, S. aureus and B. subtilis. The chloroform extracts showed considerable activities against the different pathogens, while the activity of the ethanol extracts showed lower values. The chloroform seeds extracts inhibited the growth of all pathogens efficiently and recorded the highest activity unit (AU = 25.0) against the fish pathogen V. fluvialis. Chemical composition of the extract contained carbohydrates, proteins and lipids (2.58, 0.74 and 0.074 mg), respectively, in addition to flavonoids, triterpenoids, lignin and tannin (8.6, 3, 11 and 8%), respectively. The study extended to apply these extracts on Nile tilapia sp. (Oreochromis niloticus) aquaculture, 2.5 and 5 ml L-1 of the chloroform seeds extracts were applied, 5 ml L-1 showed satisfied results while the efficiency ranged from 64.1% in the second day to 79.4% in the six day.
 
 
 
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