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    Characterization and production of the exopolysaccharide (EPS) from Pseudomonas aeruginosa G1 and Pseudomonas putida G12 strains
    (ELSEVIER SCI LTD, 2008) Celik, Gokcen Yuvali; Aslim, Belma; Beyatli, Yavuz
    In this study, exopolysaccharides (EPSs) production was investigated by growing strains of Pseudomonas aeruginosa G1 and Pseudomonas putida G12 in medium containing various carbon sources such as glucose, mannose, fructose, and xylose. EPS production (192 and 182 mg/L, respectively) of these strains grown in PAP medium with 2% glycerol (v/v) was used as control. The highest EPS production of the two strains was found in the xylose containing medium. The effect of different concentrations [2-6% (w/v)] of xylose on EPS production of both strains was also studied. The maximum EPS yield (368 mg/l(-1)) of the strain G1 was recorded in 3% (w/v) xylose, while the highest yield EPS yield (262 mg/L(-1)) of the strain G 12 was recorded in 2% (w/v) xylose. The monosaccharide compositions of EPS produced by the two strains were analyzed by HPLC. Strain G1 [2% (w/v) glycerol] was found to compose of neutral sugars (92.0%), acetylated amino sugars (8.0%), while strain G1 [3% (w/v) xylose] contained neutral sugars (99.2%), acetylated amino sugars (0.8%). However, the composition of strain G12 [2% (w/v) glycerol] was neutral sugars (96.8%), acetylated amino sugars (3.2%) and the strain G12 [2% (w/v) xylose] was found to contain neutral sugars (96.1%), acetylated amino sugars (3.9%). (C) 2007 Elsevier Ltd. All rights reserved.
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    Enhanced crude oil biodegradation and rhamnolipid production by Pseudomonas stutzeri strain G11 in the presence of Tween-80 and Triton X-100
    (TRIVENI ENTERPRISES, 2008) Celik, Gokcen Yuvali; Aslim, Belma; Beyatli, Yavuz
    In this study, the growth of sixty-one bacterial strains in crude oil were determined spectrophotometrically at 620 nm. Pseudomonas aeruginosa G11 Pseudomonas fluorescens G6, Pseudomonas stutzeri G11 and Pseudomonas putida G15 were chosen for the study based on the efficiency of crude oil utilisation. At 1%(v/v) crude oil concentration, P. stutzeri G11 strain degraded a maximum of 69%. The percentage of degradation by the P. stutzeri G11 strain decreased from 69% to 59% as the concentration of crude oil was increased from 1% (v/v) to 2.5% (v/v). Strain G11 was selected to determine the effects of surfactants(Tween-80 and TritonX-100) on the biodegradation of crude oil. While strain G11 showed 76% degradation at mineral salts medium (MSM) containing 1% (v/v) crude oil + 1% (vlv) TritonX-100, it showed 61% degradation at MSM containing 2.5% (6) crude oil + 2.5% (v/v)TritonX-100. Also, degradation rate of this strain was 96% in the presence of 1% (v/v) crude oil + 1% (v/v) Tween-80, while degradation rate was 48% in the presence of 2.5% (v/v) crude oil + 2.5% (v/v) Tween-80. Additionally, we investigated the rhamnolipid production of P. stutzeri G11 strain both in crude oil and in crude oil + two different surfactants (TritonX-100 and Tween-80, separately), These results suggest that surfactants have improved both crude oil degradation and rhamnolipid production and the degradation rates have depended very much on the chemical structure of surfactants
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    Relationship between heavy metals resistance and exopolysaccharide (EPS) synthesis of Pseudomonas spp. strains
    (PARLAR SCIENTIFIC PUBLICATIONS (P S P), 2007) Celik, Gokcen Yuvali; Aslim, Belma; Beyatli, Yavuz
    In this study, we determined the resistance to heavy metals (Zn2+ and Cd2+) and exopolysaccharide (EPS) production by 15 Pseudomonas spp. EPS yields from these strains ranged between 22-192 mg l(-1). In addition, EPS production rates of two strains (G I and G 12), selected on the basis of their high EPS production (192 and 182 mg l(-1), respectively), but also heavy metal resistance, were determined in the presence of Zn2+ (10-40 mM) and Cd2+ (5-20 mM). There was a general increase in EPS production by both strains with increasing heavy metal concentrations. G12 strain showed an increase (approx. 6-fold) in the extent of EPS produced on Pseudomonas Agar P (Difco) medium, supplemented with 2% (v/v) glycerol containing 40 mM Zn2+. By contrast, G1 strain exhibited a lower increase than G12 strain. Furthermore, G12 and G1 strains showed an identical increase (approx. 2-fold) in EPS production on Pseudomonas Agar P (Difco) medium, when supplemented with 2% (v/v) glycerol containing 20 mM Cd2+.