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Articles by Abeer M.A. Mahmoud
Total Records ( 2 ) for Abeer M.A. Mahmoud
  Abeer M.A. Mahmoud and Mohamad Saad Abd El-Karim
  Objective: This is the first attempt to investigate the natural dens grow of cyanobacterial mats as a source of some bioactive materials and biodiesel in some northern lakes of western desert, Egypt. Materials and Methods: The investigation included fatty acids, pigments (chlorophyll a, β-carotene and phycocyanin) and biochemical contents (glycerol, total protein, carbohydrates and lipids), in addition to the percentage of water and ash contents from autumn, 2013 to summer, 2014. Cyanobacterial mat was important source of protein, phycocyanin, β-carotene and a wide range of fatty acids. Results: Protein content was 284.09 wwt% in Aghormy whereas β-carotene reached to 41 times more than in carrot. The detected levels of phycocyanin (PC) in wet natural growing mats of Aghormy and Maraqi were similar to that reported in optimized dry mass production. Fatty acids spectrum found in the present study are very suitable for use as biodiesel especially in Aghormy where fatty acids characterized by high unsaturation and significant amount of palmitic and oleic fatty acids. Based on the fatty acids profile, seven biodiesel quality criteria were calculated; Cetane Number (CN), the mass of iodine (IV), Saponification Value (SV), the Cold Filter Plugging Point (CFPP), Long-Chain Saturated Factor (LCSF), the temperature at which the solid phase begins to form (CP) and Degree of Unsaturation (DU). Based on the biodiesel quality criteria, the best biodiesel was detected in Aghormy Lake. Conclusion: The cyanobacterial mats in siwa oasis is considered as a renewable natural resource of a wide range of commercially important natural products.
  Mohamad S. Abd El-Karim , Abeer M.A. Mahmoud and Mohamad H.H. Ali
  Sedimentary Fatty Acids (FAs) were investigated in surficial sediment of four sub-branches (canals) of River Nile, Egypt, to distinguish their origin of organic matter. Seventeen stations were investigated for four seasons from spring, 2014 till winter, 2015. Analysis of variance (ANOVA) with post hoc suggested significant seasonal differences in total fatty acids, fatty acid classes and main fatty acids with obvious increase in spring. The dominant Saturated Fatty Acids (SFA) in sediment samples were C16:0 and C18:0. Dominant monounsaturated fatty acids (MUFA) included C16:1ω7 and C17:1ω7 whereas, C18:1ω9 was less important. Fatty acids indicators including microalgal classes, bacteria, sewage and terrestrial plants were used to distinguish their contribution to surficial sediment organic matter. The results indicated that microalgae were major contributor to sediment organic matter, alternatively, land plant organic matter was nearly absent from the sedimentary organic matter in the four canals. Between microalgae, diatoms were prevalence over cyanobacteria and green algae. The seasonal changes in fatty acids composition were driven by the changes in species composition of microalgal communities rather than the direct effect of environmental characteristics.
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