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Öğe Biohydrogen and 5-aminolevulinic acid production from waste barley by Rhodobacter sphaeroides O.U.001 in a biorefinery concept(PERGAMON-ELSEVIER SCIENCE LTD, 2013) Kars, Gokhan; Ceylan, AycaThe production of biohydrogen and 5-aminolevulinic acid (5-ALA) by Rhodobacter sphaeroides O.U.001 was investigated in a biorefinery concept. Waste barley was used as a substrate after acid hydrolysis. The hydrolysate was analyzed in terms of its total simple sugar, organic acid, ammonium, element and total phenol contents. Four different growth media having 5 g/L, 7 g/L, 9 g/L and 11 g/L sugar content were prepared using the waste barley hydrolysate to produce biohydrogen and 5-ALA. The increased sugar concentrations resulted in higher cell density and hydrogen accumulation. Accordingly, the highest cell density (OD660: 1.78) and hydrogen production (0.4 L H-2/L culture) were observed in the 11 g/L sugar-containing medium. A 67.4 mu M 5-ALA was produced upon vitamin B-12 and levulinic acid additions. These results showed that waste barley can be used as a substrate for R. sphaeroides for biohydrogen and 5-ALA production within a biorefinery concept. Copyright (C) 2013, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.Öğe The effects of trastuzumab, paclitaxel, and carboplatin on HER2-positive cancer stem cells that are isolated from primary breast cancer cultures: a preliminary report(AMER ASSOC CANCER RESEARCH, 2015) Artac, Mehmet; Kayadibi, Gozde; Ceylan, Ayca; Kars, Meltem Demirel; Artac, Hasibe; Cakir, Murat; Boruban, Cem[Abstract not Available]Öğe Photofermentative biohydrogen production from barley waste(ELSEVIER SCIENCE BV, 2012) Kars, Gokhan; Ceylan, Ayca[Abstract not Available]
