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    Biosynthesis of silver nanoparticles using chitosan immobilized Bacillus cereus: Nanocatalytic studies
    (Elsevier, 2013) Gupta, Vinod Kumar; Atar, Necip; Yola, Mehmet Lutfi; Darcan, Cihan; Idil, Onder; Ustundag, Zafer; Suhas
    In this paper, the biosynthesis study of silver nanoparticles (AgNPs) using chitosan immobilized on the Bacillus cereus (Bc-C) was performed via bioreduction without any reducing agent. Transmission electron microscopy (TEM) showed that the AgNPs were formed as uniformly sized and shaped in the range of 10-30 nm. Scanning electron microscopy (SEM), x-ray photoelectron spectroscopy (XPS) and x-ray diffraction patterns (XRD) confirmed the formation of the Bc-C-Ag. XRD diffraction patterns revealed that the Ag+ on the Bc-C was reduced to Ag (0). This situation shows successful AgNPs synthesis using Bc-C In the bioreduction studies, the effects of operating variables such as initial metal concentration, pH and contact time were also investigated. The AgNPs formed on Bc-C (Bc-C-Ag) were used as a bionanocatalyst for the reduction of 4-nitrophenol (4-NP). The kinetic models and the thermodynamic parameters were investigated to reveal the reduction mechanism. (C) 2013 Elsevier B.V. All rights reserved.
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    Streptomyces boluensissp. nov., isolated from lake sediment
    (Springer, 2020) Tokatli, Ali; Idil, Onder; Veyisoglu, Aysel; Saygin, Hayrettin; Guven, Kiymet; Cetin, Demet; Sahin, Nevzat
    A novel Gram-stain positive, aerobic, non-motile actinobacterium, designated strain YC537(T), was isolated from lake sediment collected from Yenicaga Lake, Bolu, Turkey, and subjected to a polyphasic taxonomic approach. The organism had phylogenetic, chemotaxonomic, cultural and morphological properties consistent with its classification in the genusStreptomyces. 16S rRNA gene sequence analysis of strain YC537(T)showed that it is closely related to the type strain ofStreptomyces ziwulingensisF22(T)(97.9% sequence similarity),Streptomyces tauricusJCM 4837( T)(97.7%) andStreptomyces beijiangensisNBRC 100044( T)(97.6%). The cell wall of the strain containedLL-diaminopimelic acid and the cell-wall sugars were glucose, galactose and ribose. The major phospholipids of strain YC537(T)were diphosphatidylglycerol, phosphatidylethanolamine and phosphatidylinositol. The predominant menaquinones were identified as MK-9(H-6) and MK-9(H-8). The major cellular fatty acids wereiso-C-16:0,iso-C-14:0,anteiso-C(15:0)andiso-C-15:0. Consequently, strain YC537(T)is considered to represent a novel species in the genusStreptomyces, for which the nameStreptomyces boluensissp. nov. is proposed. The type strain is YC537(T)(= KCTC 39750( T) = DSM 102303( T)).
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    Synthesis, Structural Investigation, Hirshfeld Surface Analysis, and Biological Evaluation of N-(3-Cyanothiophen-2-yl)-2-(thiophen-2yl)acetamide
    (Amer Chemical Soc, 2022) Cakmak, Sukriye; Kansiz, Sevgi; Azam, Mohammad; Ersanli, Cem Cuneyt; Idil, Onder; Veyisoglu, Aysel; Yakan, Hasan
    In this study, a novel heterocyclic amide derivative, N-(3-cyanothiophen- 2-yl)-2-(thiophen- 2-yl)acetamide (I), was obtained by reacting 2-aminothiophene-3-carbonitrile with activated 2-(thiophen-2-yl)acetic acid in a N-acylation reaction and characterized by elemental analyses, FT-IR, H-1 and C-13 NMR spectroscopic studies, and single crystal X-ray crystallography. The crystal packing of I is stabilized by C-H center dot center dot center dot N and N-H center dot center dot center dot N hydrogen bonds. In addition, I was investigated computationally using the density functional theory (DFT) method with the B3LYP exchange and correlation functions in conjunction with the 6311++G(d,p) basis set in the gas phase. Fukui function (FF) analysis was also carried out. Electrophilicity-based charge transfer (ECT) method and charge transfer (Delta N) were computed to examine the interactions between I and DNA bases (such as guanine, thymine, adenine, and cytosine). The most important contributions to the Hirshfeld surface are H center dot center dot center dot H (21%), C center dot center dot center dot H (20%), S center dot center dot center dot H (19%), N center dot center dot center dot H (14%), and O center dot center dot center dot H (12%). An ABTS antioxidant assay was used to evaluate the in vitro antioxidant activity of I. The compound exhibited moderate antioxidant activity. The antimicrobial activity of the title molecule was investigated under aseptic conditions, using the microdilution method, against Gram-positive and Gram-negative bacterial strains, and it also demonstrated significant activity against yeasts (Candida glabrata ATCC 90030, Candida krusei ATCC 34135). The findings revealed that the molecule possesses significant antioxidant and antimicrobial properties.
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    Synthesis, structural studies and antimicrobial activity of N′-((2Z,3E)-3-(hydroxyimino)butan-2-ylidene)-2-phenylacetohydrazide and its Co(II), Ni(II) complexes
    (Elsevier Science Bv, 2018) Karadeniz, Seyma; Ataol, Cigdem Yuksektepe; Sahin, Onur; Idil, Onder; Bati, Humeyra
    A new aroylhydrazoneoxime, N'-((2Z, 3E)-3-(hydroxyimino)butan-2-ylidene)-2-phenylacetohydrazide ligand (LH2) and its Ni(II) and Co(II) complexes, have been synthesized and characterized by elemental and thermal analyses, IR and UV-vis spectroscopy, magnetic moment and X-ray diffraction. The antimicrobial activities of these compounds were tested by using minimal inhibitory concentration method (MIC). The ligand-containing aroylhydrazone and oxime groups and its Ni complex crystallize in the triclinic system and P (1) over bar space group, while its Co complex crystallizes in the monoclinic system and the C 2/c space group. X-ray results show that the ligand in the keto form is transformed into enolic form when it forms coordination. From elemental analysis data, the stoichiometry of Co(II) complex was found to be 1:2 (metal/ligand), but 1:1 for Ni(II). IR spectra indicate that the ligand acts as monoanionic NNO- tridentate and coordination takes place form through the oxime nitrogen, imine nitrogen, and enolate oxygen atoms. (C) 2018 Elsevier B.V. All rights reserved.