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Articles by Orhan Demir
Total Records ( 2 ) for Orhan Demir
  Sevgi Savas , Orhan Demir , Erkan Gumus and Murtaza Olmez
  In this study, effects on fatty acid composition of D. magna produced in the different nutritional mediums (S. acuminatus, yeast, S. acuminatus+yeast, fish oil and yeast+fish oil) were investigated. Considerable differences were found in fatty acid composition of D. magna fed with algae, yeast and fish oil. D. magna fed with algae contains considerable amounts of PUFA (46.2%), though this algae is completely bare of EPA acids. D. magna fed with yeast was contained highest of MUFA (53.5%). In contrast to algae, yeast contains mainly 16:1 and 18:1 acids and was devoid of 18:3 or PUFA. D. magna fed with fish oil contained considerable amounts of PUFA especially, EPA and DHA acids. The rate of synthesis of these acids is rather low, although fish oil contains considerable amounts of these fatty acids.
  Orhan Demir and Gurkan Diken
  This study involved to demonstrate changes in chemical composition of Rotifer Brachionus plicatilis (O.F. Muller 1786) fed on three commercial enrichment products. The rotifers were cultured on a mixture of ω3 algae and ω3 yeast 60 products. The enrichments of rotifers were made using Red Pepper Paste (ZA), AlgaMac 3050 (ZB) and Spresso (ZC) products. The analysed nutritional compositions before and after enrichment process significantly (p<0.05) changed for crude fat from 6.18±0.24 to 14.26±1.22% and for crude protein from 48.24±0.57 to 59.21±0.32%, respectively. Crude ash contents were significantly (p<0.05) changed from 6.65±0.46 to 15.39±0.39% while no significant difference were seen between the control group of K (concentrated rotifer cultures) and nutritionally enriched groups (ZA, AB and ZC). The ratio of protein: lipid in all experimental groups ranged from 3.47±0.18 to 9.54±0.34. Those values were nearly similar for enriched rotifer groups but statistically (p<0.05) being lower that the values of the control-group (K). Of commercial enrichment products AlgaMac 3050 and Spresso were seen to provide effective and efficient results in terms of analysed nutritional compositions.
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