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RISS 인기검색어
- 검색키워드
- 저자 : Nurettin Sahiner (검색결과 3 건)
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Nurettin Sahiner,Alper O. Yasar,Nahit Aktas 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.23 No.-
Poly(4-vinyl pyridine)-silica (p(4-VP)-silica) composites were synthesized via micro emulsion polymerization, and the capsule of p(4-vinyl pyridine), as cap-p(4-VP), was prepared by removing the core silica from p(4-VP)-silica composites by HF treatment. Dicationic particles in the form of cappoly( 4-vinyl pyridine)++-1,4-butane (cap-p(4-VP)++-C4), capsule-poly(4-vinyl pyridine)++-1,6-hexane (cap-p(4-VP)++-C6), and capsule-poly(4-vinyl pyridine)++-1,8-octane (cap-p(4-VP)++-C8) were prepared by modifying cap-p(4-VP) particles with corresponding dibromo alkanes. Then, polymer–metal composites were also prepared from cap-p(4-VP) and dicationic cap-p(4-VP) particles by loading CoCl2 from ethanol and the obtained composites were used in H2 generation from hydrolysis of NaBH4, and The Ea for the composite catalyst was calculated as 56.53 kJ/mol.
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Isolation, Characterization and Numerical Taxonomy of Novel Oxalate-oxidizing Bacteria
Sahin, Nurettin,Gokler, Isa,Tamer, Abdurrahman The Microbiological Society of Korea 2002 The journal of microbiology Vol.40 No.2
The present work is aimed at providing additional new pure cultures of oxalate utilizing bacteria and its preliminary characterization for further work in the field of oxalate-metabolism and taxonomic studies. The taxonomy of 14 mesophilic, aerobic oxalotrophic bacteria isolated by an enrichment culture technique from soils rhizosphers, and the juice of the petiole/stem tissue of plants was investigated. Isolates were characterized with 95 morphological, biochemical and physiological tests. Cellular lipid components and carotenoids of isolates were also studied as an aid to taxonomic characterization. All isolates were Gram-negative, oxidase and catalase positive and no growth factors were required. In addition to oxalates, some of the strains grow on methanol and/or formate. The taxonomic similarities among isolates, reference strains or previously reported oxalotrophic bacteria were analysed by using the Simple Matching (S/ sub SM/) and Jaccard (S$\_$J/) Coefficients. Clustering was performed by using the unweighted pair group method with arithmetic averages (UPGMA) algorithm. The oxalotrophic strains formed five major and two single-member clusters at the 70-86% similarity level. Based on the numerical taxonomy, isolates were separated into three phenotypic groups. Pink-pigmented strains belonged to Methylobacterium extorquens, yellow-pigmented strains were most similar to Pseudomonas sp. YOx and Xanthobacter autorophicus, and heterogeneous non-pigmented strains were closely related to genera Azospirillum, Ancylobacter, Burkholderia and Pseudomonas. New strains belonged to the genera Pseudomonas, Azospirillum and Ancylobacter that differ taxonomically from other known oxalate oxidizers were obtained. Numerical analysis indicated that some strains of the yellow-pigmented and nonpigmented clusters might represent new species.
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Tugce Turhan,Nurettin Sahiner,Yuksel Guvenilir Avcıbası 한국공업화학회 2013 Journal of Industrial and Engineering Chemistry Vol.19 No.4
In this study, polymeric hydrogels derived from 3-sulfopropyl methacrylate (SPM) were used in the preparation of composite-catalyst system in hydrogen generation from hydrolysis of NaBH4. In order to generate pores and determine their effect on hydrogen production, silica based p(SPM) hydrogels were synthesized also prepared. Additionally, the effects of metal type, temperature, the amount of the catalyst, metal reloading, and reusability were investigated. The activation energy, activation enthalpy,and activation entropy for the hydroylsis reaction of NaBH4 solution in the presence of p(SPM)–Co catalyst system were calculated as 41.67 kJ mol-1, 38.15 kJ mol-1, -173.139 J/mol K, respectively.
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