Yazar "Ozbas, Bircan" seçeneğine göre listele

Listeleniyor 1 - 2 / 2
  • [ X ]
    Öğe
    Growth characteristic of Nannochloropsis sp (Eustigmatophyta) in tubular photobioreactor in winter period
    (Ege Univ, Fac Fisheries, 2007) Gokpinar, Sevket; Goksan, Tolga; Cirik, Semra; Ozbas, Bircan
    In our country, microalgae cultures in the marine fish larvae hatcheries are carried out in transparent polyethylene bags due to the low investment costs. However, such methods, which are considered unproductive with respect to phototrophic production, result in high production costs due to the requirements of large area and high manpower. In this respect, tubular and panel photobioreactors are the productive systems having higher illumination surface and running at higher photosynthesis rate. In the experiments, BioFence tubular photobioreactor, a commercial microalgae culture system in 600 liter volume and 3 cm outer diameter, was used. The growth of Nannochloropsis sp., grown in the tubular photobioreactor outdoors in both batch and continuous culture modes during 47 days, was observed in the study. Accordingly, the cultures that were begun with a cell density of 16 x 10(6) cells ml(-1), were carried out 22 days in batch mode, and reached to 320 x 10(6) cells ml(-1) at end of the trial. The culture was shifted to the continuous mode when the cell precipitation was observed on the bottom of the tubes due to the high cell density. The continuous mode, which was initiated just after the batch mode, was carried out 25 days. Although the system had a short illumination cycle, e.g., 7 hours a day, due to the location the system set up and the season, the system produced 81 L culture per day at an average cell concentration of 208 cells ml(-1) during the experiment. As a result, it was shown that a tubular photobioreactor outdoors ran more efficient than the bag cultures.
  • [ X ]
    Öğe
    Growth of Brachionus plicatilis (Rotifer) on various diets
    (Ege Univ, 2006) Ozbas, Bircan; Goksan, Tolga; Ak, Ilknur
    In this study, in which the effects of various food sources on the rotifer Brachionus plicatilis were examined, rotifers were fed with Nannochloropsis sp., yeast (Saccharomyces cerevisiae) and dried Spirulina meal. In the first trial, optimum Spirulina concentration was found to be 0.01 g / 10(6) rotifers per day. In the experimental groups, 5 groups were arranged, e.g., alga, alga+yeast, alga+Spirulina, yeast+Spirulina and yeast/2+Spirulina. In the microscopic observations, it was seen that Spirulina particles were larger than that rotifer can consume. Consequently, the groups that contained alga showed the best growth pattern. Spirulina could not be consumed due to the larger particle size. Regarding the yeast cells, although their size are in the optimum range for rotifer feeding, they exhibited a lower growth rate compared to the groups fed with alga due to the fact that the yeast caused the culture medium to deteriorate.