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    Biosorption of Remazol Navy Blue dye with Saccharomyces cerevisiae Biomass
    (Kahramanmaras Sutcu Imam Univ, 2012) Korhan, Hamdullah; Halipci, Hatice Nur; Kertmen, Metin; Digrak, Metin
    Developing technology with a growing population and rapid industrialization in the world had been caused environmental pollution as an enormous and increasingly difficult problem of solving. Nowadays, the pollution has become disrupts the balance of nature and it has reached levels that threaten human life. From past to present, as a huge part of the earth - water environment-the pollution have been exposed there more than air and soil. In this study; S. cerevisiae was used to as a biosorbent for removal of Remazol Navy Blue (RNB) by adsorption techniqiue. The effects of contact time, initial dye concentration, solution pH and temperature on biosorption were investigated. As a result of the study, 30 degrees C has been found as optimum for maximum RNB adsorption. In optimum pH experiments, it is determined that maximum biosorption was occured at pH 3value at ratio of, and ratio of % 96,56 (30. dk) for RNB. The optimum conditions for dye concentrations was obtained for 150 mg/L solution and it is indicated that 1 gr yeast could maximum adsorb 73,42 mg/g RNB dye.
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    Biosorption of Remazol Turquoise Blue dye with Saccharomyces cerevisiae Biomass
    (Kahramanmaras Sutcu Imam Univ, 2012) Halipci, Hatice Nur; Korhan, Hamdullah; Digrak, Metin; Kertmen, Metin
    Dye contaminants pollution caused by a variety of industries negatively affects the environment and threats especially human health. Nowadays, these kind of problems constitute an important place therefore many studies are undertaken only for this purpose. In this study; S. cerevisiae was used to as a biosorbent for removal of Remazol Turkuaz Blue (RTB) by adsorption techniqiue. The effects of contact time, initial dye concentration, solution pH and temperature on biosorption were investigated. As a result of the study, 30 degrees C has been found as optimum for maximum RTB adsorption. In optimum pH experiments, it is determined that maximum biosorption was occured at pH 3 value at ratio of % 95.48(30. dk). The optimum conditions for dye concentrations was obtained for 150 mg/L solution and it is indicated that 1 gr yeast could maximum adsorb 61.51 mg /g RTB dye.
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    Comparison of Antimicrobial Activity of Echinops viscosus Subsp Bithynicus and E. microcephalus Leaves and Flowers Extracts from Turkey
    (Friends Science Publishers, 2012) Toroglu, Sevil; Keskin, Dilek; Vural, Cem; Kertmen, Metin; Cenet, Menderes
    The antimicrobial activities of the ethyl acetate, acetone, methanol and ethanol extracts of Echinops viscosus DC subsp. bithynicus (Boiss) Rech. and E. microcephalus Sm. were studied by disc diffusion method. These extracts were tested against eight bacteria and four fungi, which revealed various levels of antimicrobial activity. The methanol, ethyl acetate, acetone extracts of EMF showed more antibacterial activity against S. aureus (18-19-18 mm 50 mu L-1 inhibition zone) than standart antibiotics (f= 95.765; df= 18; p<0.0001). The methanol extracts of EVF showed antibacterial activity against E. coli equal to standart antibiotics (V30 & E15). The ethyl acetate extracts of EVL showed antibacterial activity against B. megaterium equal to standart antibiotic (V30). The acetone extracts of EVF and EVL showed antimicrobial activity against M. pusilus close rate to standart antibiotic. E. viscosus and E. microcephalus contain antimicrobial components against different microorganisms, which could be in various pharmaceutical preparations. c 2012 Friends Science Publishers
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    Öğe
    Comparison of antimicrobial activity of echinops viscosus subsp. Bithynicus and E. Microcephalus leaves and flowers extracts from Turkey
    (2012) Toro?lu, Sevil; Keskin, Dilek; Vural, Cem; Kertmen, Metin; Cenet, Menderes
    The antimicrobial activities of the ethyl acetate, acetone, methanol and ethanol extracts of Echinops viscosus DC subsp. bithynicus (Boiss) Rech. and E. microcephalus Sm. were studied by disc diffusion method. These extracts were tested against eight bacteria and four fungi, which revealed various levels of antimicrobial activity. The methanol, ethyl acetate, acetone extracts of EMF showed more antibacterial activity against S. aureus (18-19-18 mm 50 ?L-1 inhibition zone) than standart antibiotics (f= 95.765; df= 18; p<0.0001). The methanol extracts of EVF showed antibacterial activity against E. coli equal to standart antibiotics (V30 & E15). The ethyl acetate extracts of EVL showed antibacterial activity against B. megaterium equal to standart antibiotic (V30). The acetone extracts of EVF and EVL showed antimicrobial activity againstM. pusilus close rate to standart antibiotic. E. viscosus and E. microcephalus contain antimicrobial components against different microorganisms, which could be in various pharmaceutical preparations. © 2012 Friends Science Publishers.
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    Design of a new porphyrin-based compound and investigation of its photosensitive properties for antibacterial photodynamic therapy
    (Pergamon-Elsevier Science Ltd, 2024) Kurtar, Seda Nur Kertmen; Kertmen, Metin; Kose, Muhammet
    Considering the increasing number of pathogens resistant to commonly used antibiotics as well as antiseptics, there is an urgent need for antimicrobial approaches that can effectively inactivate pathogens without the risk of establishing resistance. An alternative approach in this context is antibacterial photodynamic therapy (APDT). APDT is a process that involves bacterial cell death using appropriate wavelength light energy and photosensitizer and causes the production of reactive oxygen species inside or outside the microbial cell depending on the penetration of light energy. In our study, a new porphyrin compound 4,4 '-methylenebis(2-((E)-((4-(10,15,20triphenylporphyrin-5-yl)phenyl)imino)methyl)phenol) (SP) was designed and synthesized as photosensitizer and its structure was clarified by NMR (13C and 1H) and mass determination method. Photophysical and photochemical properties were examined in detail using different methods. Singlet oxygen quantum yields were obtained as 0.48 and 0.59 by direct and indirect methods, respectively. Antibacterial activity studies have been conducted within the scope of biological activity and promising results have been obtained under LED light (500-700 nm, 265 V, 1500 LM), contributing to the antibacterial photodynamic therapy literature.