Yazar "Abdullah, Meysun I." seçeneğine göre listele
Listeleniyor 1 - 8 / 8
Sayfa Başına Sonuç
Sıralama seçenekleri
Öğe Biodegradation of reactive red 195 azo dye by the bacterium Rhodopseudomonas palustris 51ATA(ACADEMIC JOURNALS, 2012) Celik, Leyla; Ozturk, Ayten; Abdullah, Meysun I.The sulphonated reactive red 195 dye (RR195) was used as carbon source and energy by the widely spread, eco-friendly, photoheterothrophic strain 51ATA that belongs to Rhodopseudomonas palustris. This bacterium, which was isolated from Lake Akkaya, (Nigde, Turkey), was able to completely degrade and mineralize the dye under anaerobic conditions with 100% efficiency. The degradation efficiency of this strain, in the presence and absence of a co-substrate was investigated. The biodegradation of the dye was monitored by UV-visible, (FTIR) spectroscopy and HPLC. From these analyses, a complete mineralization of the toxic aromatic ring system of the reactive red 195 dye was observed.Öğe Biosorption of astrazon red dye by the bacterium Rhodopseudomonas sp. strain 51ATA(Springer, 2021) Abdullah, Meysun I.; ozturk, Ayten; Bayol, EmelAstrazon red azodye that is still widely used in Turkey is released into the aquatic environment. Since these dyes are degradable into the toxic aromatic amines, they have become a public health and environmental concern. In this study, the biosorption of the Astrazon red dye from aqueous solutions on dehydrated cells of Rhodopseudomonas sp. 51ATA was studied as a function of each pH, temperature and initial dye concentration. Rhodopseudomons sp. 51ATA strain belongs to the Rhodopseudomonas species which is an eco-friendly photosynthetic and facultative anaerobic bacterium. The best uptake of Astrazon red was observed at pH 2.0 and the data obtained were applied to both Freundlich and Langmuir adsorption isotherms. The adsorption data provided an excellent fit to both isotherms and showed good agreement to Scatchard analysis at various temperatures. Freundlich isotherm showed good fit to the data at low temperatures while Langmuir model was suitable for describing the adsorption at higher temperatures. Therefore, from these data, we could report that Rhodopseudomonas sp. 51ATA strain is very efficient bacterium for the removal of dyes from wastewater.Öğe BIOSORPTION OF DICHLORVOS BY THE ANAEROBIC PHOTOSYNTHETIC BACTERIUM Rhodopseudomonas palustris NU51(PARLAR SCIENTIFIC PUBLICATIONS (P S P), 2011) Selimoglu, Hatice; Ozturk, Ayten; Arisoy, Munevver; Abdullah, Meysun I.Dichlorvos (DDVP) is a very toxic pesticide intentionally released into the environment, and its use raises public health and environmental concerns. Nevertheless, it is still widely used in Turkey. In this study, the biosorption of DDVP from aqueous solutions on dehydrated cells of Rhodopseudomonas palustris NU51 was studied as a function of pH, temperature, initial DDVP and biomass concentration. R. palustris NU51 strain belongs to the widely spread and the eco-friendly Rhodopseudomonas species. The best uptake was observed at pH 6.0 and 35 degrees C. As the concentration of biomass has increased, the DDVP uptake has increased from 18.7 to 31.17%, but the concentration of pesticide has decreased. When these results were applied to both Langmuir and Freundlich isotherms, the adsorption data provided an excellent fit to both isotherms and showed good agreement to Scatchard analysis. We could conclude that R. palustris NU51 strain is an excellent bacterium for the removal of pesticides and could be successfully used in wastewater treatments.Öğe Biosorption of dichlorvos by the anaerobic photosynthetic bacterium rhodopseudomonas palustris NU51(2011) Selimiu, Hatice; Öztürk, Ayten; Arisoy, Münevver; Abdullah, Meysun I.Dichlorvos (DDVP) is a very toxic pesticide intentionally released into the environment, and its use raises public health and environmental concerns. Nevertheless, it is still widely used in Turkey.this study, the biosorption of DDVP from aqueous solutions on dehydrated cells of Rhodopseudomonas palustris NU51 was studied as a function of pH, temperature, initial DDVP and biomass concentration. R. palustris NU51 strain belongs to the widely spread and the eco-friendly Rhodopseudomonas species. The best uptake was observed at pH 6.0 and 35°C. As the concentration of biomass has increased, the DDVP uptake has increased from 18.7 to 31.17%, but the concentration of pesticide has decreased. When these results were applied to both Langmuir and Freundlich isotherms, the adsorption data provided an excellent fit to both isotherms and showed good agreement to Scatchard analysis. We could conclude that R. palustris NU51 strain is an excellent bacterium for the removal of pesticides and could be successfully used in wastewater treatments. © by PSP.Öğe Clay Catalyzed Reactions of Indole and its Methyl Derivatives with alpha, beta-unsaturated Carbonyl Compounds(CROATIAN CHEMICAL SOC, 2014) Dasbasi, Teslima; Abdullah, Meysun I.Electrophilic substituons reactions of indole and 1-methylindole with methyl propiolate in the presence of K-10 montmorillonite were obtained the formation of the corresponding methyl 3,3-bis(indolyl)propanoates. The reaction of 1,3-dimethylindole with methyl propiolate was given methyl 3,3-bis(1,3-dimethyl-1H-indol-2-yl)propanoate, methyl 1,5-dimethyl-1H-benzo[b]azepine-3-carboxylate and methyl 3,3,3-tris(1,3-dimethyl-1H-indol-2-yl)propanoate. The reaction of 1,3-dimethylindole with 2-cyclopentenone was yielded a typical addition product, similarly the reaction of indole and 1-methylindole with 2-cyclopentenone were concluded the expected addition products only.Öğe Effect of the temperature and mobile phase composition on the retention behavior of nitroanilines on ligand-exchange stationary phase(ELSEVIER SCIENCE BV, 2006) Gurten, A. Ali; Ucan, Mustafa; Abdullah, Meysun I.; Ayar, AhmetThis paper deals with the separation of isomers of nitroaniline by liquid chromatography using the ligand-exchange technique. The chromatographic separations were performed on the ligand-exchanger sporopollenin. The sporopollenin used as support of stationary phase was modified with carboxylated-ethylenediamine matrix and was loaded with cobalt(II) ions. Using the column packed with cobalt(II) loaded carboxylated diaminoethyl sporopollenin [Co(II)-CDA-E-S], the retention behavior of 3- and 4-nitroanilines was investigated. The mobile phase used, was a mixture of 0.05 M NH4OH in ethanol-water. The resolution was strongly affected by the presence of ammonium hydroxide in the mobile phase and a concentration of 0.05 M was shown to be necessary for the separation of analytes. To study the effects of temperature on the resolution. column runs were also performed at various temperatures (15-60 degrees C). With increasing temperature. a decreased interaction between the solutes and the ligand-exchanger was observed. Consequently. the best results were obtained using a mixture of 0.05M NH4OH in ethanol-water (10:90. v/v) as the mobile phase at a column temperature of 35 degrees C. Ligand-exchange chromatography on the Co(II)-CDAE-S could be a useful alternative method for the separation of nitroaniline. (c) 2005 Elsevier B.V. All rights reserved.Öğe Electrophilic substitution in indoles, part 20? Hammett correlations of the coupling of aryldiazonium tetrafluoroborates with indole and its 1-, 2- and 3-methyl derivatives(Japan Institute of Heterocyclic Chemistry, 2003) Aldemir, Selda; Kahyaoglu, Hulya; Abdullah, Meysun I.Hammett plots for the coupling of a range of substituted aryldiazonium tetrafluoroborate salts in dry acetonitrile with indole and its 1-, 2- and 3-methyl derivatives gave linear relationships, with p values ca. of +2.60, +2.54, +2.40 and +3.60 respectively.Öğe Synthesis and Characterization of Aminophosphines, Bis(amino) phosphine Derivatives, and Their Molybdenum(0) Complexes(TAYLOR & FRANCIS LTD, 2009) Sarioz, Ozlem; Serindag, Osman; Abdullah, Meysun I.Functionalized bis(amino)phosphines of the type PhP(NHR)(2) (1a-c) and aminophosphines of the type Ph(2)PNHR (2a-c) have been synthesized by treating PhPCl(2) or Ph(2)PCl with corresponding primary amines of H(2)N-R where R = -CH(2)SO(3)H, -C(6)H(4)SO(3)H, and benzo-15-crown-5. The molybdenum(0) complex of the aminophosphine (3) has been obtained by reacting cis-[Mo(CO)(4)(bipy)] with aminophosphine (2c). The synthesized aminophosphines, bis(amino) phosphines, and the molybdenum(0) complex have been characterized by IR, (1)H NMR, (31)P NMR, and MS spectroscopic techniques and by elemental analysis.
