Browsing by Subject "Soil pollution"

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    Çayırhan Termik Santrali
    (Bilkent University, 2020) Çelik, Musa Burak; Alp, Merve; Perkgöz, Mehmet Batuhan; Gülay, Muhammed Saim; Erdem, Oğuz
    Bu araştırmada, Türkiye'nin 35. Ankara'nın ise 2. büyük termik santrali olan Çayırhan Termik Santrali'nin 1976'da temellerinin atılmasından başlayarak günümüze kadar geçirdiği tarihi tüm süreçler ayrıntılı olarak incelenmektedir. Linyit bazlı Çayırhan Termik Santrali'nin ciddi bir elektrik enerjisi ihtiyacını karşıladığı göz önünde bulundurularak, psikolojik ve çevresel etkileri ele alınmıştır. Santralın Türkiye'de özel sektöre devredilen ilk termik santral olmasıyla beraber özelleştirme süreci ve sonrası da ayrıntıyla incelenmiş, doğurduğu siyasi ve sosyo-ekonomik etkiler aktarılmıştır.
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    Effective biodegradation of 2,4,6-trinitrotoluene using a novel bacterial strain isolated from TNT-contaminated soil
    (2013) Gumuscu, B.; Tekinay, T.
    In this environmental-sample based study, rapid microbial-mediated degradation of 2,4,6-trinitrotoluene (TNT) contaminated soils is demonstrated by a novel strain, Achromobacter spanius STE 11. Complete removal of 100mgL-1 TNT is achieved within only 20h under aerobic conditions by the isolate. In thisbio-conversion process, TNT is transformed to 2,4-dinitrotoluene (7mgL-1), 2,6-dinitrotoluene (3mgL-1), 4-aminodinitrotoluene (49mgL-1) and 2-aminodinitrotoluene (16mgL-1) as the key metabolites. A. spanius STE 11 has the ability to denitrate TNT in aerobic conditions as suggested by the dinitrotoluene and NO3 productions during the growth period. Elemental analysis results indicate that 24.77mgL-1 nitrogen from TNT was accumulated in the cell biomass, showing that STE 11 can use TNT as its sole nitrogen source. TNT degradation was observed between pH 4.0-8.0 and 4-43°C; however, the most efficient degradation was at pH 6.0-7.0 and 30°C. © 2013 Elsevier Ltd.
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    Production and structural characterization of biosurfactant produced by newly isolated staphylococcus xylosus STF1 from petroleum contaminated soil
    (Elsevier BV, 2015) Keskin, N. O. S.; Han, D.; Ozkan A.D.; Angun, P.; Umu, O. C. O.; Tekinay, T.
    Petroleum-contaminated soil was used to isolate and characterize biosurfactant producing bacteria. The strain could produce higher amount of biosurfactant in medium supplemented with motor oil as sole source of carbon and energy. A new biosurfactant producing bacterium, designated as Staphylococcus xylosus STF1 based on morphological, physiological, biochemical tests and 16S rRNA gene sequencing. The isolated bacterium was first screened for the ability to produce biosurfactant. Partial sequence of STF1 strain of 16S rDNA gene was highly similar to those of various members of the family Staphylococcaceae. Biochemical characterizations including FT-IR, Raman spectroscopy and Mass spectroscopy studies suggested the biosurfactant to be lipopeptide. Study also confirmed that the cell free supernatant exhibited high emulsifying activity against the different hydrocarbons. Moreover, the partially purified biosurfactant exhibited antimicrobial activity by inhibiting the growth of several bacterial species. The strain could be a potential candidate for the production of polypeptide biosurfactant which could be useful in a variety of biotechnological and industrial processes, particularly in the food and oil industry. © 2015 Elsevier B.V.