الفهرس 
IntroductiionOnly 14 pages are availabe for public view
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Abstract
Seven different pinnate diatom species namely, Nitzschia palea, N. hungarica, N. angustata, N. amphibia, N. capitellata, N. denticula and Navicula confervacea were isolated from water samples collected from delta region of the River Nile in Egypt. The effects of different standard nutrient media and vitamins supplement on growth and lipid content (n-hexane extract) of all test diatoms indicated that NAV nutrient medium supported relatively higher biomass production of most of the test diatoms. Neither medium type nor vitamins supplement exhibits any significant effects on lipid production. Marked decline in concentration of N, P and Si of nutrient medium was evident at the end of 6 days incubation period. The pinnate diatom N. palea maintained relatively higher biomass and lipid production without vitamins supplement, therefore it was selected as a model test diatom for further experimental work. Effects of Nualgi® and initial N concentration on growth and lipid production of N. palea were investigated. The GC/Ms, GPC and physicochemical analyses indicated that lipid fraction of N. palea seems promising feedstock of biodiesel. A full annual cycle of outdoor growth and lipid production of the pinnate diatom Nitzschia palea in vertical-bed photobioreactors indicated the obvious capability of N. palea to accommodate outdoor growth under different field environmental conditions. Acid catalyzed alcoholysis of N. palea lipids indicated about 93.3 % conversion fatty acids to corresponding fatty acid methyl esters FAME (biodiesel).