Yazar "Ozturk, Sahlan" seçeneğine göre listele

Listeleniyor 1 - 2 / 2
  • Küçük Resim
    Öğe
    Metal removal of cyanobacterial exopolysaccharides by uronic acid content and monosaccharide composition
    (Elsevier Sci Ltd, 2014) Ozturk, Sahlan; Aslim, Belma; Suludere, Zekiye; Tan, Sema
    In the present study, chromium, cadmium and metal mixed (chromium + cadmium) removal and its association with exopolysaccharides and uronic acids production in Synechocystis sp. BAS0671 were investigated. It was investigated that BAS0671 showed different removal ability when exposed to each metal solely and mixed metal. EPS production by BAS0671 was increased following exposure to 15 and 35 ppm Cr(VI), Cd(II) and Cr(VI) + Cd(II). Monomer composition of EPS was changed after metal treatment. Uronic acid contents of metal treated cells were higher than control cells of each isolate. Also, glucuronic acid content and galactronic acid content of EPS correlated with uronic acid contents of cells. Scanning electron microscopy and energy dispersive X-ray spectroscopy analysis confirmed that a considerable amount of metals had precipitated on the cell surface. Fourier transform infrared spectrum analysis of EPSs indicated the presence of C-H and C-O group, which may serve as binding sites for divalent cations. (C) 2013 Elsevier Ltd. All rights reserved.
  • Küçük Resim
    Öğe
    Removal and reduction of chromium by Pseudomonas spp. and their correlation to rhamnolipid production
    (Elsevier Science Bv, 2012) Ozturk, Sahlan; Kaya, Tayfun; Aslim, Belma; Tan, Sema
    Chromium removal and its association with rhamnolipid production in Pseudomonas spp. were investigated. Three Pseudomonas spp. isolates (P. aeruginosa 78, P. aeruginosa 99, and P. stutzeri T3) were investigated with regard to their exposure to 10 mg/L for chromium removal. P. aeruginosa 99 removed 16% and 20% more chromium than P. stutzeri T3 and P. aeruginosa 78 respectively. The reduction of Cr(VI) to Cr(III) by all the three isolates is more or less similar. P. aeruginosa 99, which removed higher chromium, also produced higher rhamnolipid (165 +/- 5 mg/mL). P. aeruginosa 78, which removed lower chromium, also produced lower rhamnolipid (126 +/- 3 mg/mL). Rhamnolipid production by P. aeruginosa 78 and P. aeruginosa 99 was increased in its exposure to 10 mg/L chromium. In the present study, results showed that rhamnolipid might play a role in chromium removal by three Pseudomonas spp. isolates. (C) 2012 Elsevier B.V. All rights reserved.