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Details of Dr. Abdel-Fattah Mohamed El-Sayed   


PERSONAL DATA

Gender male
Job title Professor
Department Oceanography
Regions Mediterranean Sea - Western Basin
Tel 00203-4273858, 0020122-1699648
Fax 00203-3911794
Email
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Website http://www.sci.alex.edu.eg
Social Media Links
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PROFESSIONAL DATA

Degree PhD
Job type Teaching/Education , Research
Research Area(s) Fisheries, Aquaculture , Fisheries, Aquaculture
Research Activities 1- 120 publications in aquaculture, fish biology and fisheries 2- Four books in aquaculture, fish biology. 3- More than 45 international conferences in aquaculture, fisheries and related fields. 4- Aquaculture consultant with the FAO, ROPME and Arab Organisation for Agricultural development. 5- Editorial Board of: (a) Aquaculture Research, (b) International Aquafeeds, (c) Egyptian J. of Aquatic Research. 5- Translation of 130 FAO Fisheries Technical Papers and Fisheries Circular from English into Arabic, for FAO.
Research Region 2, 3
Skills/Expertise Fish Nutrition specialist. Tilapia culture expert. Fish biology
PUBLICATIONS (as reported by Dr. Abdel-Fattah EL-SAYED)

El-Sayed, A.-F.M., Dickson, M.D., El-Naggar, G.O. 2015. Value chain analysis of the aquaculture feed sector in Egypt. Aquaculture, 437, 92?101.
Ibrahim EB, El-Tarabily AK, Kassab AA, Abdel-Fattah ME, Rasheed NM (2015) Evaluation of Date Fiber as Feed Ingredient for Nile Tilapia Oreochromis niloticus Fingerlings. Journal of Aquaculture Research and Development 6: 320. doi:10.4172/2155-9546.1000320
Al-Feky, S.A., El-Sayed, El-Sayed, A.-F.M., Ezzat, A.A. 2015. Dietary taurine enhances growth and feed utilization in larval Nile tilapia (Oreochromis niloticus) fed soybean meal-based diets. Aquaculture Nutrition (in press).
Sakr, E.M., Shalaby, S.M., Wassef, E.A., M. El-Sayed, A.-F.M., Abdel Moneim, A.I. 2015. Evaluation of Periphyton as a Food Source for Nile Tilapia (Oreochromis niloticus) Juveniles Fed Reduced Protein Levels in Cages. Journal of Applied Aquaculture, 27:50?60.
El-Sayed Ali, T., Abdel-Aziz, S.H., El-Sayed, A.-F.M., Zeid, S. 2014. Structural and functional effects of early exposure to 4-nonylphenol on gonadal development of Nile tilapia (Oreochromis niloticus): a-histological alterations in ovaries
Al-Feky, S.A., El-Sayed, El-Sayed, A.-F.M., Ezzat, A.A. 2014. Dietary taurine improves reproductive performance of Nile tilapia (Oreochromis niloticus) broodstock. Aquaculture Nutrition (On line: doi: 10.1111/anu.12256).
El-Sayed, A.-F.M. 2014. Fish feed industry in Egypt: constraints and solutions. International Aquafeeds, 2, 32-33.
El-Sayed, A.-F.M. 2014. Is dietary taurine essential for farmed fishes??- a review. Reviews in Aquaculture, 6, 241?255.
El-Sayed Ali, T., Abdel-Aziz, S.H., El-Sayed, A.-F.M., Zeid, S. 2014. Structural and functional effects of early exposure to 4-nonylphenol on gonadal development of Nile tilapia (Oreochromis niloticus): b-histological alterations in testes. Fish Physiology and Biochemistry, 40:1509?1519.
8. El-Sayed, A.-F.M., ElGhobashy, A.E. and El-Mezayen, M.M. 2013. Effects of feed colour on growth and feed utilization efficiency of Nile tilapia (Oreochromis niloticus L.) fry and fingerlings. Aquaculture Nutrition, 19, 870-876.
10. El-Sayed, A.-F.M. 2013. On-farm feed management practices for Nile tilapia (Oreochromis niloticus) in Egypt. In: M.R. Hasan and M.B. New, eds. On-farm feeding and feed management in aquaculture. FAO Fisheries and Aquaculture Technical Paper No. 583. Rome, FAO. pp. 101-129.
El-Sayed, A.-F.M. 2013. An overview of tilapia feed management practices in Sub-Saharan Africa. In: M.R. Hasan and M.B. New, eds. On-farm feeding and feed management in aquaculture. FAO Fisheries and Aquaculture Technical Paper No. 583. Rome, FAO. pp. 377?405.
Abdel-Barr, M., El-Sayed, A-F.M, Al-Oraimi, A. (2012). Length-frequency, Yield and Biomass Per Recruit Analysis for Yellowfin Tuna, Thunnus albacares (Bonnaterre 1788) in the Arabian Sea off Oman. Asian Fisheries Science 25, 290-302.
Tacon, A.G.J., Hasan, M.R., Allan, G., El-Sayed, A.-F., Jackson, A., Kaushik, S.J., Ng, W-K., Suresh, V. & Viana, M.T. (2012). Aquaculture feeds: addressing the long-term sustainability of the sector. In R.P. Subasinghe, J.R. Arthur, D.M. Bartley, S.S. De Silva, M. Halwart, N. Hishamunda, C.V. Mohan & P. Sorgeloos, eds. Farming the Waters for People and Food. Proceedings of the Global Conference on Aquaculture 2010, Phuket, Thailand, 22?25 September 2010. pp. 193?231. FAO, Rome and NACA, Bangkok.
Bandpei, M.A., El-Sayed, A.-F.M., Fazli, H., Pourgholam, R., Nasrolahzadeh, H., Valinassab, T. (2012). Food and feeding habits of the Caspian marine shad, Alosa braschnikowi (Clupeidae) in the southern Caspian Sea. Cybium, 36(3), 411-416.
El-Sayed, A.-F.M, Abdel-Aziz, E.H, Heba M. Abdel-Ghani, H.M (2012). Effects of phytoestrogens on sex reversal of Nile tilapia (Oreochromis niloticus) larvae fed diets treated with 17??Methyltestosterone. Aquaculture, 360-361, 58?63.
El-Sayed, A.-F.M, El-Ghobashy, A.E. (2011). Effects of tank colour and feed colour on growth and feed utilization of thinlip mullet (Liza ramada) larvae. Aquaculture Research, 42, 1163-1169.
El-Sayed, A.-F.M. (2011). On-farm feed management practices for Nile tilapia (Oreochromis niloticus) in Egypt. FAO Technical paper.
El-Sayed, A.-F.M. (2011). An overview of tilapia feed management practices in Sub-Saharan Africa. FAO Technical Paper.
El-Sayed, A.-F.M., Abdel?Hakim, N.F., Abo- State, H.A., El-Kholy, K.F., Dosoky A. Al-Azab, D.A. (2010). Effects of L-carnitine on growth performance of Nile tilapia (Oreochromis niloticus) fingerlings fed basal diet or diets containing decreasing protein levels. Journal of American Science, 6(5), 165-172.
Abdel Barr, M.A., Sayed, A.-F.M., and Osman.A.M (2010). The Use of Per Recruit Models for Stock Assessment and Management of Greasy Grouper Epinephelus tauvina in The Arabian Gulf Waters off Qatar. Tropical Life Sciences Research, 21(1), 87?94.
Bandpei, M.A., Mashhor, M., Abdolmalaki, S, El-Sayed, A.-F.M. (2010). The population dynamics of Caspian Kutum, Rutilus frisii kutum (Cyprinidae) in the southern Caspian Sea, Iran. Cybium, 34(3): 285-292.
Bandpei, M.A.F, Mashhor, M., Abdolmalaki, S. & El-Sayed, A.-F.M. (2009). Food and feeding habits of the Caspian Kutum, Rutilus frisii kutum (Cyprinidae) in Iranian waters of the Caspian Sea. Cybium, 33(3), 193-198.
Oczkowskia, A J., Nixona, S.W., Grangera, S.L., El-Sayed, A.-F.M, McKinneyc, R.A. (2009). Anthropogenic enhancement of Egypt?s Mediterranean fishery. Proc. National Academy of Science (PNAS), 106 (5), 1364?1367.
Aliyu-Paiko, M., Hashim, R., , Alexander Shu-Chien Chong, A., Yogarajah, L. & El-Sayed, A.-F.M. (2009). Influence of different sources and levels of dietary protein and lipid on the growth, feed efficiency, muscle composition and fatty acid profile of Snakehead Channa striatus (Bloch, 1793) fingerling. Aquaculture Research, 2009, 1-12.
El-sayed, A.-F.M. (2008). Reducing feed feed costs in semi-intensive tilapia culture. International Aquafeeds, 11(1), 32-34.
El-Sayed, A.-F.M., Kawanna, M. (2008). Ambient water temperature boosts growth rates of Nile tilapia Fry reared in recycling systems. Aquaculture Research, 39, 670-672.
El-Sayed, A.-F. M. and Kawanna, M. (2008). Effects of dietary protein and energy levels on growth and spawning performance of Nile tilapia (Oreochromis niloticus) reared in a recycling system. Aquaculture, 280, 179-184.
Oczkowskia, A J., Nixona, S.W., Grangera, S.L., El-Sayed, A.-F.M., Altabet, M., McKinney, R. (2008). A Preliminary Survey of the Nitrogen and Carbon Isotope Characteristics of Fish from the Lagoons of Egypt?s Nile Delta. Estuaries and Coasts, 31, 1130?1142.
El-Sayed, A.-F.M., Kawanna, M. (2007). Effects of photoperiod on growth and spawning efficiency of Nile tilapia (Oreochromis niloticus) broodstock in a recycling system. Aquaculture Research 38, 1242-1247.
El-Sayed, A.-F.M, Abdel-Barr, M. and Osman, A. (2007). Age, growth and population structure of grouper (Epinephalus tauvina) (Teleostei, Serranidae) in the Arabian Gulf waters off Qatar. Egyptian J. Aquatic Research. 33(1): 352-361.
El-Sayed, A.-F.M, Abdel-Barr, M. and Osman (2007). Estimation of total mortality rates and virtual population analysis of grouper (Epinephelus tauvina) from Arabian Gulf, Qatar. Egyptian J. Aquatic Research. 33(1): 362-370.
Hamza, W. Al-Dhaheri, S. and El-Sayed (2006). Pioneer limnological observations on the developed ecosystem of a permanent lake in Abu-Dhabi desert, UAE. Verh. Internat. Verein. Limnol., 29:1559-1564.
El-Sayed, A.-F.M. (2006). Aqua Feeds in Egypt. Aqua Feeds: Formulation & Beyond, 3(203): 8-9.
El-Sayed, A.-F.M. ?Tilapia Culture? (2006). CAB International Publishers, UK, 277 pp.
Hamza, W. Al-Dhaheri, S. and El-Sayed (2006). Pioneer limnological observations on the developed ecosystem of a permanent lake in Abu-Dhabi desert, UAE. Verh. Internat. Verein. Limnol., 29:1559-1564.
El-Shamsi, L., Hamza, W. and El-Sayed, A.-F.M (2006). Effects of food source on growth rates and survival of Nile tilapia (Oreochromis niloticus) fry. Aquatic Ecosystem Health and Management, 9(4), 447-455.
El-Sayed, A.-F.M. (2006). Tilapia Culture in Saltwater: their ecological requirements and nutritional implications and economic Potentials. Proceedings of the 8th International Symposium on Aquaculture Nutrition. Mazatlan, Sinaloa, Mexico, 15-17 Nov. 2006, pp. 95-106.
El-Sayed, A.-F.M. (2006). Sustainable Development of Lake-based Aquaculture in Egypt. Proc. Of the 1st International Conference on Environmental Change in Lakes, Lagoons, and Wetlands of the Southern Mediterranean region. Alexandria, Egypt, 4-7 January, 2006 (In preparation).
El-Sayed, A.-F.M., Hamza, W.R., Al-Darmaki, M. (2006). Evaluation of date pits as a feed ingredient for juvenile and adult Nile tilapia (Oreochromis niloticus) reared in a recirculating system. Proceeding of 7th Int. Symp. On Tilapia aquaculture.
Wassef, E.A., El-Sayed, A.-F.M., Sakr, E.M. (2005). Evaluation of Pterocladia (Rhodophyta) and Ulva (Chlorophyta) meals as additives to gilthead seabream Sparus aurata diets. Egyp. J. Aquatic Res., 31: 321-332.
El-Sayed, A. M., Mansour, C. R., Ezzat, A. A. (2005). Effects of dietary lipid source on spawning performance of Nile tilapia (Oreochromis niloticus) broodstock reared at different water salinities. Aquaculture, 248: 187-196.
El-Sayed, A.-F.M., Kawanna, M. and Mudar, M. (2005). Effects of Water Flow Rates on Growth and Survival of Nile Tilapia Fry. World Aquaculture, 36 (1): 5-6.
El-Sayed, A.-F.M., Kawanna, M. (2004). Effects of photoperiod on the performance of farmed Nile tilapia. I. growth, feed utilization efficiency and survival of fry and fingerlings. Aquaculture, 231: 393?402.
El Sayed, A.-F.M. (2004). Protein nutrition of farmed tilapia: Searching for unconventional sources. Proceedings of the 6th International Symposium on Tilapia in Aquaculture, Manila, Philippines, pp. 364-378.
El-Sayed, A.-F.M. (2004). Tilapia production rising in Africa. Global Aquaculture Advocate. 7(2): 36.
El Sayed, A.-F.M. (2004). Feed color affects growth, feed utilization of Nile tilapia. Global Aquaculture Advocate, 7(2):76.
El-Sayed, A.-F.M. (2003). The major commercial fishes of the Arabian Gulf: their species, reproduction and fisheries. Ajman J. of Studies and Research, 2(1):47-78 (in Arabic).
El-Sayed, A. M. (2003). Effects of fermentation methods on the nutritive value of water hyacinth for Nile tilapia, Oreochromis niloticus (L.) fingerlings. Aquaculture, 218:471-478.
El-Sayed, A. M. (2003). Effects of fermentation methods on the nutritive value of water hyacinth for Nile tilapia, Oreochromis niloticus (L.) fingerlings. Aquaculture, 218:471-478.
El-Sayed, A.-F.M., Mansour, C. R., Ezzat, A. A. (2003). Effects of dietary protein levels on spawning performance of Nile tilapia (Oreochromis niloticus) broodstock reared at different water salinities. Aquaculture, 220:619-632.
El Sayed, A.-F.M. (2002). Effects of stocking density and feeding levels on growth and feed efficiency of Nile tilapia (Oreochromis niloticus) fry. Aquaculture Research, 33:621-626.
El Sayed, A.-F.M. (2002). Water salinity affects protein and lipid requirements of Nile tilapia broodstock. Global Aquaculture Advocate, 5(6):46.
El Sayed, A.-F.M. (2001). Tilapia culture in Arabia. Global Aquaculture Advocate, 4(6):46.
El Sayed, A.-F.M. (2001). Alternative Ingredient Sources for Tilapia Aquafeeds. Global Aquaculture Advocate, 4(2):30-31.
El-Sayed, A.-F.M., Moyano, F.J., Martinez, I. (2000). Assessment of the effect of plant inhibitors on digestive protease of Nile tilapia using in vitro assays. Aquaculture International, 8:403-415.
El-Sayed, A.-F.M. (1999). Mixed-feed manufacturing in Egypt. Cahiers Options Mediterraneennes, 37:331-336.
El-Sayed, A.-F.M. (1999). Alternative protein sources for farmed tilapia. Aquaculture, 179(1-4):149-168 .
El-Sayed, A.-F.M. (1999). Aquaculture feed manufacturing practices within the North African Region. Cahiers Options Mediterraneennes, 37:129-136.
El-Sayed, A.-F.M. (1998). Recent Approaches in fish nutrition. Proc. II Workshop on ?Fisheries Resources Development and Human Health Protection?. Univ. Cairo, 17 March, 1998. Pp. 69-71.
El-Sayed, A.-F.M., Mansour, K.R., Ezzat, A. (1998). Evaluation of different animal protein sources for red tilapia fingerlings. Egyp. J. Aquatic Biol. Fish., 2(4):527-535).
El Sayed, A.-F.M. (1998). Total replacement of fish meal with animal protein sources in practical diets of Nile tilapia (Oreochromis niloticus). Aquaculture Research, 29:275-280.
El Sayed, A.-F.M. and Tacon, A.G.J. (1997). Fish meal replacers for tilapia, A review. Cahiers Options Mediterraneennes, 22:205-224.
El Sayed, A.-F.M. (1997). The response of freshwater prawn Macrobrachium rosenbergii to different levels of water hardness and salinity. Prc. 7th. Internl. Conf. On Environmental Protection is a Must, Alexandria, 20 22 May, pp. 471-475.
El Sayed, A.-F.M. (1997). Growth rates and feed efficiency of freshwater prawn (Macrobrachium rosenbergii) fed varying protein and energy levels. Bull. Natl. Instit. Oceanogr. Fish., A.R. Egypt., 23(2):317-326.
El-Sayed, A.-F.M. and El-Ghobashy, A. (1997). Growth rates and feed efficiency of the freshwater prawn Macrobrachium rosenbergii fed varying protein and energy levels. Bul. Natl. Inst. Oceanogr. Fish. A.R. Egypt, 23(2): 317-326.
El-Sayed, A.-F.M. and El-Ghobashy, A. (1997). Effect of stocking density on growth rates, feed utilization and profitability of European seabass Dicentrarchus labrax reared in floating cages. Bul. Natl. Inst. Oceanogr. Fish. A.R. Egypt, 23(2):449-458.
El Sayed, A.-F.M. 1996. Aquaculture potential and development in Egypt. Proceedings of the 8th European Association of Fisheries Economists (EAFE), Barcelona, 1 4 April 1996. Pp. 77-84.
El Sayed, A.-F.M. and Abdel Bary K. (1995). Reproductive cycle of rabbitfish Siganus canaliculatus (Siganidae) in the Arabian Gulf. Oebalia, XX:79 88.
El Sayed, A.-F.M. 1994. Evaluation of Soybean meal, spirulina alga meal and chicken offal meal as protein sources for silver seabream Rhabdosargus sarba. Aquaculture, 127:169-176.
El Sayed, A.-F.M. Abdel Bary, K. and Hamwy, O. (1994). Population biology of the Hamoor Epinephelus tauvina in Qatari waters. Paper presented at the Gulf symposium on Environmental biology, Doha, Qatar, 7-9 May 1994.
El Sayed, A.-F.M. 1993. Fisheries resources in the Gulf Cooperation Council (GCC). Attaawun (in Arabic), 31:51 80.
Ezzat, A., El Sayed, A.-F.M., and N.A.-F.M. El Dossary. 1992. Growth of fish Lethrinus nebulosus from the Arabian Gulf waters off Dammam (Saudi Arabia). Indian J. Mar. Sci., 21:284 286.
El Sayed, A.-F.M. 1992. Effects of substituting fish meal with Azolla pinnata in practical diets for fingerling and adult Nile tilapia Oreochromis niloticus L. Aquaculture and Fisheries Management, 23:167 173.
El Sayed, A.-F.M. 1992. The status of Qatar's fisheries during 1980 1990. Qatar Univ. Sci J., 12: 233 238.
El Sayed, A.-F.M. 1992. Effects of substituting fish meal with Azolla pinnata in practical diets for fingerling and adult Nile tilapia Oreochromis niloticus L. Aquaculture and Fisheries Management, 23:167 173.
El Sayed, A.-F.M. 1991. Protein requirements for optimum growth of Liza ramada fry (Mugilidae) at different water salinities. Aquatic Living Resources, 4: 117 123.
El Sayed, A.-F.M. 1991. Evaluation of sugarcane bagasse as a feed ingredient for the tilapias Oreochromis niloticus and Tilapia zillii. Asian Fisheries Science, 4:53 60.
Ezzat, A.A., Abdel-Aziz, S.H., El-Sayed, A.-F.M. & Berakaa, S. 1991. Protogenous sex reversal in bogue Boops boops L. Alex J. Vetr. Sci., 6&7:39-46.
El Sayed, A.-F.M. 1990. Long term evaluation of cotton seed meal as a protein source for Nile tilapia Oreochromis niloticus. Aquaculture, 84:315 320.
9. Wassef, E.A., El-Sayed, A.-F.M. and & Sakr, E.M. 2013. Pterocladia (Rhodophyta) and Ulva (Chlorophyta) as feed supplements for European seabass, Dicentrarchus labrax L., fry. Journal of Applied Phycology, 5 (5), 1369-1376.
El-Sayed, A.-F.M., Dickson, M.D., El-Naggar, G.O. 2015. Value chain analysis of the aquaculture feed sector in Egypt. Aquaculture, 437, 92?101. Al-Feky, S.A., El-Sayed, El-Sayed, A.-F.M., Ezzat, A.A. 2015. Dietary taurine enhances growth and feed utilization in larval Nile tilapia (Oreochromis niloticus) fed soybean meal-based diets. Aquaculture Nutrition (in press). Al-Feky, S.A., El-Sayed, El-Sayed, A.-F.M., Ezzat, A.A. 2014. Dietary taurine improves reproductive performance of Nile tilapia (Oreochromis niloticus) broodstock. Aquaculture Nutrition (On line: doi: 10.1111/anu.12256). El-Sayed Ali, T., Abdel-Aziz, S.H., El-Sayed, A.-F.M., Zeid, S. 2014. Structural and functional effects of early exposure to 4-nonylphenol on gonadal development of Nile tilapia (Oreochromis niloticus): a-histological alterations in ovaries. Fish Physiology and Biochemistry, 40:1495?1507. El-Sayed Ali, T., Abdel-Aziz, S.H., El-Sayed, A.-F.M., Zeid, S. 2014. Structural and functional effects of early exposure to 4-nonylphenol on gonadal development of Nile tilapia (Oreochromis niloticus): b-histological alterations in testes. Fish Physiology and Biochemistry, 40:1509?1519. El-Sayed, A.-F.M. 2014. Fish feed industry in Egypt: constraints and solutions. International Aquafeeds, 2, 32-33. El-Sayed, A.-F.M. 2014. Is dietary taurine essential for farmed fishes??- a review. Reviews in Aquaculture, 6, 241?255. El-Sayed, A.-F.M., ElGhobashy, A.E. and El-Mezayen, M.M. 2013. Effects of feed colour on growth and feed utilization efficiency of Nile tilapia (Oreochromis niloticus L.) fry and fingerlings. Aquaculture Nutrition, 19, 870-876. Wassef, E.A., El-Sayed, A.-F.M. and & Sakr, E.M. 2013. Pterocladia (Rhodophyta) and Ulva (Chlorophyta) as feed supplements for European seabass, Dicentrarchus labrax L., fry. Journal of Applied Phycology, 5 (5), 1369-1376. El-Sayed, A.-F.M. 2013. On-farm feed management practices for Nile tilapia (Oreochromis niloticus) in Egypt. In: M.R. Hasan and M.B. New, eds. On-farm feeding and feed management in aquaculture. FAO Fisheries and Aquaculture Technical Paper No. 583. Rome, FAO. pp. 101-129. El-Sayed, A.-F.M. 2013. An overview of tilapia feed management practices in Sub-Saharan Africa. In: M.R. Hasan and M.B. New, eds. On-farm feeding and feed management in aquaculture. FAO Fisheries and Aquaculture Technical Paper No. 583. Rome, FAO. pp. 377?405.
El-Sayed, A.-F.M. and Abdel-Bary K. 1995. Population biology of sparid fishes in Qatari waters. 4. Growth and mortality of longspine sea bream, Argyrops spinifer. Qatar Univ. Sci. J., 15(2):457-461.
El Sayed, A.-F.M. and Abdel Bary, K. 1993. Population biology of sparid fishes in Qatari waters. 2. Age, growth and mortality of black banded seabream, Mylio bifasciatus. Qatar Univ. Sci. J., 13(2):348 352.
El Sayed, A.-F.M. 1994. Feeding habits of rabbitfish Siganus canaliculatus and S. javus from the Arabian Gulf waters off Qatar. Indian Journal of Marine Sciences 23(2):112 114.
El Sayed, A.-F.M. and Abdel Bary, K. 1993. Population biology of sparid fishes in Qatari waters. 1. Reproductive cycle and fecundity of longspine seabream Argyrops spinifer. Qatar Univ. Sci. J., 13(1):177 181.
El Sayed, A.-F.M. and Abdel Bary, K. 1994. Population biology of sparid fishes in Qatari waters. 3. reproductive cycle and fecundity of black banded seabream, Mylio bifasciatus. Qatar Univ. Sci J., 14(1):212 216.
El Sayed, A.-F.M. 1994. Mullet culture in Qatar. Effects of replacing fish meal with soybean meal on growth and feed utilization of Liza macrolepis. Qatar Univ. Sci. J., 14(1):207 211.


Created: 2008-09-23 Last Updated: 2015-07-03 by Abdel-Fattah EL-SAYED