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Articles by Mostafa M. El-Sheekh
Total Records ( 2 ) for Mostafa M. El-Sheekh
  Mostafa M. El-Sheekh and Alaa A. Fathy
  This study is an attempt to evaluate the nutritional value of Chlorella vulgaris Beijerinck grown under autotrophic and heterotrophic conditions concerning their content of carotenoids, protein, proline, total free amino acids and fatty acids. Chlorophyll a (Chl.a) content of autotrophic cells of C. vulgaris was double that estimated in heterotrophic cells, while chlorophyll b (Chl.b) content of autotrophic cells was nearly half the value recorded for heterotrophic cells. Carotenoids (Car.) content of heterotrophic cultures decreased by 30.82% compared to that value of autotrophic cells. There was a slight decrease in the protein content of C. vulgaris under heterotrophic conditions. When the composition of total free amino acids and proline of C. vulgaris grown under autotrophic conditions is compared to that grown heterotrophically, it was observed that a significant increase in total free amino acids and proline in heterotrophic cultures. The percentage of most fatty acids of heterotrophic cells was relatively higher than autotrophic ones. There was no qualitative difference between autotrophic and heterotrophic cultures, except for the fatty acid 16:02 which was absent under autotrophic conditions. Present results showed that C. vulgaris has quite a simple qualitative fatty acids composition compared to other chlorophycean species, considering production of natural food supplements and/or natural pharmaceutical products, it is strongly recommended using autotrophic cells of Chlorella rather than using those of heterotrophic cells for such purpose.
  Mohamed El-anwar H. Osman , Mostafa M. El-Sheekh , Metwally A. Metwally , Abd El-whab A. Ismail and Mona M. Ismail
  This study was conducted to investigate the suppression effect of some antagonistic fungi and cyanobacterial species against Rhizoctonia solani as the causal agent of soybean root rot. Growth of Rhizoctonia solani as the causal agent of root rot of soybeans was inhibited (in vitro and greenhouse conditions) in the presence of some antagonistic fungi (Gliocladium deliquescens, G. virens, Trichoderma hamatum and T. harzianum) and cyanobacterial species (Nostoc entophytum and N. muscurum). The results show that Trichoderma harzianum was the best antagonistic fungi whereas Nostoc entophytum as cyanobacteria showed antifungal activity higher than Nostoc muscurum, the inhibitory effect was dependant on the type of the bioagent. In experiments carried out in greenhouse, the growth parameters (length, weight, carbohydrate, protein and nitrogen) of the infected soybean plants showed different responses to the tested biological agents as compared to untreated infected plant. It could be concluded from the obtained data the fruitful use of the tested biotic factors for controlling rot root of soybean induced by Rhizoctonia solani.
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