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Articles by Hilal Kargin Yilmaz
Total Records ( 3 ) for Hilal Kargin Yilmaz
  Hilal Kargin Yilmaz , Deniz Ayas and Harun Yilmaz
  Spirulina platensis, cyanobacteria was cultivated in a helical photobioreactor and in a continuous system. Cultivation continued at different salinity ratios (10, 20, 30%) for 10 days. The total volume of the photobioreactor was 24.3 L comprising of 18 L nutrition medium and 6.3 L algae. Each day, the system yielded 10 L of algae and 10 L of nutrition medium was added into the system. At the end of 10 day experiment, the medium reached to1.042x107 filament L-1 from an initial filament density of 7.596x106 filament L-1 at 10% salinity, 7.409x106 filament L-1 from an initial filament density of 7.60x106 filament L-1 at 20% salinity and to 7.381x106 filament L-1 from an initial filament density of 7.62x106 filament L-1 at 30% salinity. Variations in proximate composition of S. platensis occurred due to the different rates of salinity. Carbohydrate, TMS (Total Mineral Substance) and lipid values increased; protein levels decreased in parallel with the increase in salinity. A reduction of approximately 13.05% occurred in the protein values, 26.08% increase in the lipid value, 31.85% increase in TMS and 9.86% increase in carbohydrate values were observed.
  Hilal Kargin Yilmaz
  Spirulina platensis, Cyanobacteria was cultivated in a batch culture system at different temperature (30±1, 35±1 and 40±1°C) for 10 days. The total volume of a glass container in batch culture was 2 L comprising of 1.9 L Spirulina medium and 0.1 L algae. It was determined to changes of cellular concentration, specific growth rate and proximate compositions (protein, lipid and total mineral substance) of Spirulina platensis which was produced in different temperature. Maximum cellular concentration of 30 and 40°C in batch cultures was found at 3rd and 6th days, 6.783 and 6.333 g L-1, respectively. The highest cellular concentration was found out of 35°C at 6th day as 7.967 g L-1. Maximum specific growth rate at 30°C was found out at 4th day as 0.34 division day-1. The highest specific growth rates at 35 and 40°C was observed at 2nd day as 0.58 and 0.63 division day-1, respectively. The most appropriate growth rate for S. platensis was detected at 35°C. The results of proximate analysis showed that carbohydrate, TMS (Total Mineral Substance) and lipid levels increased protein levels decreased in parallel with the increase temperature of culture medium. A reduction of approximately 8.63% occurred in the protein levels, 11.44% increase in the lipid levels, 10.40% increase in the TMS levels and 19.95% increase in carbohydrate levels were observed.
  Hilal Kargin Yilmaz , Ozlem Sezgin and Mahitap D. Duru
  In this study, Dry Chicken Manure (DCM) was used as the source of nitrogen in the production of Spirulina platensis. In the course of the experiment, the rate of the culture volume was adjusted to 10 L and the preliminary use of algae concentration was adjusted as being 500 filament mL-1. The study was conducted in two different nutrition medium for 10 days with discontinuous production mode. First nutrition medium was constituted by adding the following respectively, II: group 2 mg L-1 urea; III: group 2 mg L-1 urea and 40 mg L-1 sodium bicarbonate; IV: group 40 mg L-1 sodium bicarbonate. Second nutrition medium was constituted by adding the following respectively, II: group 1 mg L-1 urea; III: group 1 mg L-1 urea and 20 mg L-1 sodium bicarbonate; IV: group 20 mg L-1 sodium bicarbonate. The 1 group of both nutrition mediums contains only chicken manure. The fat and fatty acid analyses of S. platensis which is obtained in the nutrition medium had been conducted. Statistically, no kind of discrepancy was noted between the two different nutrition mediums in terms of lipid levels (p>0.05). In the study, basic fat acids are determined as follows: capric acid (C10:0), lauric asid (C12:0), myristic acid (C14:0), myristoleic acid (C14:1), palmitic acid (C16:0), palmitoleic acid (C16:1), heptadecanoic acid (C17:0), Cis-10 heptadecenoic acid (C17:1), stearic acid (C18:0), oleic acid (C18:1ω9), linoleic acid (C18:2ω6), gamma linolenic acid (C18:3ω6), alfa linolenic acid (C18:3ω3).
 
 
 
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