Newly designed bioanode for glucose/O2 biofuel cells to generate renewable energy

Korkut, Şeyda | Kılıç, Muhammet Samet | Hazer, Baki

Article | 2019 | Asia-Pacific Journal of Chemical Engineering14 ( 6 )

A copolymer poly(methyl methacrylate-co-vinylferrocene) was synthesized and used for the first time in a biofuel cell design. Bioanaode enzyme glucose oxidase and biocathode enzyme bilirubin oxidase were physically immobilized onto the copolymer-modified electrodes. Characterization studies were conducted by scanning electron microscopy, carbon-13, fourier transform infrared and hydrogen-1 nuclear magnetic resonance, and cyclic voltammograms. The designed biofuel cell was operated with linear sweep voltammetry. The maximum current was at 45°C with 120 µg of polymer amount. An improved power density of 323 µW cm-2 that is higher than . . . other ferrocene-based fuel cells was obtained with 10-mM glucose at 0.4 V with the designed bioanode. © 2019 John Wiley & Sons Ltd Daha fazlası Daha az

Molecular Survey of Babesia microti (Aconoidasida: Piroplasmida) in Wild Rodents in Turkey

Usluca, Selma | Celebi, Bekir | Karasartova, Djursun | Güreser, Semra | Matur, Ferhat | Öktem, Mehmet Ali | Sözen, Mustafa | Karataş, Ahmet | Babur, Cahit | Mumcuoğlu, Kosta | Özkan-Taylan Ayşegül

Review | 2019 | Journal of Medical Entomology56 ( 6 ) , pp.1605 - 1609

Babesia microti (Aconoidasida: Piroplasmida) (Franca, 1910) is an important tick-borne zoonotic parasite with rodents serving as reservoir hosts. In the present study, 536 rodents were captured from Burdur, Bartin, Giresun, and Yozgat provinces of Turkey between the years 2010 and 2012, and blood samples were examined for the presence of Babesia spp. using conventional PCR which targeted the 18S rRNA gene. The sequence analysis of PCR amplicons was tested for B. microti as well as for Hepatozoon spp., and Sarcocystis spp. Overall, 5.8% of the rodents were positive for B. microti: 41% in Myodes glareolus, 7.7% in Chionomys roberti, a . . .nd 2% in Apodemus spp., whereas no Babesia DNA was detected in Mus macedonicus and Microtus spp. Six rodents were positive for Hepatozoon spp. and one rodent was positive for Sarcocystis spp. Overall, 14.9 and 4.5% of rodents captured from Bartin and Giresun provinces, respectively, were PCR positive for B. microti, whereas none of rodents captured in Burdur and Yozgat were positive for Babesia spp. The sequence data of B. microti from rodents revealed that all sequences belonged to the zoonotic genotype. Sequences of B. microti obtained from rodents of the Bartin province were genotypically closer to European isolates, whereas those obtained from rodents of the Giresun province were closer to Russian and Mongolian isolates. © 2019 Crown copyright 2019 Daha fazlası Daha az

Synthesis of novel biodegradable elastomers based on poly[3-hydroxy butyrate] and poly[3-hydroxy octanoate] via transamidation reaction

Hazer, Baki | Akyol, Elvan | Şanal, Timur | Guillaume, Sophie | Çakmaklı, Birten | Steinbuchel, Alexander

Article | 2019 | Polymer Bulletin76 ( 2 ) , pp.919 - 932

Poly(3-hydroxyalkanoate)s (PHAs) are a class of polymers receiving attention because of their potential as renewable, biodegradable and high-technology properties. Unlike most short chain length (scl) PHAs such as poly(3-hydroxybutyrate) (PHB), medium chain length (mcl) PHAs such as poly(3-hydroxyoctanoate) (PHO) exhibit low crystallinity and are elastomeric in character. PHB-b–PEG-b–PHO block copolymers can combine both properties in block copolymer matrix. In this study, we report the synthesis of the block copolymers combining the PHB and PHO blocks. Transamidation reactions of PHB with polyethylene glycol with primary amine yiel . . .d equimolar amounts and PHB with amine ends. PHO reacts with the modified PHB containing the amine end to give PHB-b–PEG-b–PHO block copolymers. Structural analysis of the products was performed by using 1H–, 13C, heteronuclear single quantum coherence NMR techniques. Thermal and mechanical properties of the block polymers were also evaluated. © 2018, Springer-Verlag GmbH Germany, part of Springer Nature Daha fazlası Daha az

Physical, biological and chemical characterisation of wood treated with silver nanoparticles

Can, Ahmet | Palanti, Sabrina | Sivrikaya, Hüseyin | Hazer, Baki | Stefani, Federico

Article | 2019 | Cellulose26 ( 8 ) , pp.5075 - 5084

Nowadays, environmentally friendly processes are of great interest and are considerably needed due to the environmental pollution seems to be a problem worldwide. For this reason, in this study, silver nanoparticles were synthesized using environmentally-friendly methods and their effectiveness as wood preservatives was investigated. Scots pine (Pinus sylvestris L.) samples were impregnated with an autoxidized soybean oil polymer containing Ag nanoparticles (Agsbox). Samples characterised by Fourier transform infrared spectroscopy (FTIR) were tested against brown rot (Coniophora puteana) and wood-destroying insects (Hylotrupes bajul . . .us). In addition, decay tests were applied to mini-block samples leached according to the EN 84 standard. Results demonstrated that Agsbox increased decay resistance in the unleached samples. However, low efficacy was exhibited against newborn H. bajulus larvae. As a results of FTIR measurement, impregnated with the nanocomposites showed significant changes at the 2910 cm-1 (C–H) and 1712 cm-1 (C=O) peaks. © 2019, Springer Nature B.V Daha fazlası Daha az

Potent bioactive bone cements impregnated with polystyrene-g-soybean oil-AgNPs for advanced bone tissue applications

İlhan, Elif | Karahaliloğlu, Zeynep | Kılıçay, Ebru | Hazer, Baki | Denkbaş, Emir Baki

Article | 2019 | Materials Technology , pp.5075 - 5084

Postoperative infection in orthopaedic and trauma surgery is one of the most feared complications. Recently, the high prevalence of multidrug-resistant bacteria has made the antibiotic treatment ineffective; thus novel non-antibiotic alternative approaches to this problem are urgently needed. Based on these expectations, in this work, in order to enhance the cytocompatibility and antibacterial performances of poly (methyl methacrylate (PMMA) and beta-tricalcium phosphate (ß-TCP) bone cements were impregnated with polystyrene (PS)-g-soybean oil graft copolymer containing AgNPs (PS-Agsbox), and we assessed the antimicrobial activity o . . .f the fabricated bone cements against Staphylococcus aureus and Escherichia coli. Nanoparticles at concentration of 1.25% (5 ß-TCP) w/w in ß-TCP bone cements were able to inhibit pathogens growth, while a concentration of 3.75% (15PMMA) was needed for PMMA bone cement. Therefore, the impregnated bone cements with PS-AgsboxNPs may be further explored as an alternative antimicrobial therapy for the treatment of infected bone defects. © 2019, © 2019 Informa UK Limited, trading as Taylor & Francis Group Daha fazlası Daha az

Electrochemical determination of urea using a gold nanoparticle-copolymer coated-enzyme modified gold electrode

Korkut, Şeyda | Uzunçar, Sinan | Kılıç, Muhammet Samet | Hazer, Baki

Article | 2019 | Instrumentation Science and Technology47 ( 1 ) , pp.1 - 18

A new amperometric urea biosensor based on gold nanoparticle embedded poly(propylene-co-imidazole) was developed for the determination of urea. The urease adsorbed on the polymeric film catalyzed the hydrolysis of urea to ammonium and bicarbonate ions and the ammonium was then electrooxidized on the gold electrode with the aid of gold nanoparticles at +0.2 V versus Ag/AgCl using differential pulse voltammetry. The biosensor provided a linear current response to urea concentration from 0.1 to 30 mM, a detection limit of 36 µM, a relative standard deviation of 2.43% (n = 18), and excellent storage stability, as the current decrease wa . . .s only 3% after 75 days. The operation of the biosensor was evaluated by the analysis of municipal sewage wastewater collected from the inlet pipe of the treatment plant of Zonguldak City in Turkey. The effects of possible interferants were also characterized. © 2018, © 2018 Taylor & Francis Daha fazlası Daha az

Synthesis of block/graft copolymers based on vinyl benzyl chloride via reversible addition fragmentation chain transfer (RAFT) polymerization using the carboxylic acid functionalized Trithiocarbonate

Hazer, Baki | Arslan, Hülya | Senemoğlu, Yetkin | Şen, Şadi

Article | 2019 | Journal of Polymer Research26 ( 5 ) , pp.1 - 18

Reversible Addition-Fragmentation Chain-Transfer (RAFT) polymerization of styrene (St), vinyl benzyl chloride (vbc), tert-butyl methacrylate (tertBMA) and n-butyl methacrylate (nBMA) was investigated using carboxylic acid functionalized trithiocarbonate (R2). A series of random copolymer of styrene and vinyl benzyl chloride was prepared in order to control chloromethyl functionality in the copolymer, via RAFT polymerization. Addition to this, first-order kinetic behavior of the RAFT polymerization of vbc using R2 was also evaluated. A novel series of amphiphilic copolymers based on polyethylene glycol (PEG) with molar masses of 500 . . .and 2000 g/mol, functionalized polyvinyl benzyl chloride (Pvbc) were obtained via the Williamson-ether-synthesis. As chloromethyl functionality increases, the introduced PEG increases. Fractional precipitation, thermal properties and water uptakes of the amphiphilic polymer samples were evaluated. The new polymers can be the promising materials with high aqueous solubility capacity. © 2019, The Polymer Society, Taipei Daha fazlası Daha az

The effects of oxyclozanide on survival, development and total protein of galleria mellonella L. (Lepidoptera: Pyralidae)

Çelik, Cihat | Büyükgüzel, Kemal | Büyükgüzel, Ender

Article | 2019 | Journal of the Entomological Research Society21 ( 1 ) , pp.95 - 108

We investigated that the effects of oxyclozanide on survival rate, development time, adult longevity and the amount of total protein (TP) in different developmental stages (7th-instars larvae, pupae and adult) of greater wax moth Galleria mellonella L. First-instar larvae of insects were reared on 0.003, 0.03 and 0.3 g oxyclozanide in 100 g artificial diets. When compared to all tested concentrations of oxyclozanide and control diet without oxyclozanide, it was confirmed that this anthelmintic drug significantly reduced survival rate of 7th-instar larval stage, pupal and adult stage of G. mellonella. While 7th-instars larval rate is . . . 91.25 ± 6.21 % in the control diet without oxyclozanide, this rate has been determined 28.75 ± 3.24 % in the 0.3 % concentration of oxyclozanide. TP of the insect increased in response to all concentration of oxyclozanide in comparison to control diet. This considerable increase was expressed almost two-fold especially at the 0.003 and 0.03 % of oxyclozanide concentrations in all developmental stages. The results obtained from this research support that the oxyclozanide has effects on the survival, development, adult longevity and TP of the insect. © 2019 Gazi Entomological Research Society. All rights reserved Daha fazlası Daha az

Oxidative effects of gemifloxacin on some biological traits of drosophila melanogaster (Diptera: Drosophilidae)

Aslan, Nilay | Büyükgüzel, Ender | Büyükgüzel, Kemal

Article | 2019 | Environmental Entomology48 ( 3 ) , pp.667 - 673

In recent times, several studies have been undertaken on the artificial mass-rearing of insects in which clinical antibacterial antibiotics, including gemifloxacin, which is a DNA gyrase and topoisomerases inhibitor, are amended into the diet to control microbial contamination and preserve diet. The findings of these studies have suggested the possibility that these antibiotics influence the biological traits of insects in relation to their oxidative effects. This study investigated the effects of gemifloxacin on Drosophila melanogaster (Meigen) survival rates, development times, and male-female adult longevity. And we also determin . . .ed the effects of gemifloxacin on lipid peroxidation product, malondialdehyde, protein carbonyl levels, and glutathione S-transferase activity of fruit fly eggs. First instars were fed on artificial diets containing 150, 300, 600, and 900 mg/liter concentrations of gemifloxacin until adult emergence. Our results indicate that sublethal effects of gemifloxacin are likely to significantly impair adult fitness and life-history parameters in D. melanogaster, probably because of its oxidative effects. © 2019 The Author(s). Published by Oxford University Press on behalf of Entomological Society of America. All rights reserved Daha fazlası Daha az

Effects of a DNA gyrase inhibitor, Novobiocin, on the biological parameters of Galleria mellonella (Lepidoptera: Pyralidae) larvae

Büyükgüzel, Ender | Büyükgüzel, Kemal

Article | 2019 | Journal of Entomological Science54 ( 1 ) , pp.79 - 86

Galleria mellonella L. larvae were reared on a standard artificial diet amended with various concentrations (0.5%, 1.0%, 1.5%, and 2.0%) of the aminocoumarin DNA gyrase inhibitor antibiotic drug novobiocin. The effects of the inhibitor on survival and development of the larvae were measured. Survival rates for 7th instars, pupae, and emerging adults were 90.0%, 86.2%, and 76.2%, respectively, in the control diet. These rates were decreased to 15.0%, 7.5%, and 6.2% for larvae fed the diet with the highest novobiocin concentration (2.0%). High concentrations of the antibiotic caused prolongation in the larval, pupal, and adult develop . . .mental periods. Our results indicate that this gyrase inhibitor can be used as dietary additive in artificial rearing of G. mellonella when its concentrations are ascertained. © 2019 Georgia Entomological Society Inc. All rights reserved Daha fazlası Daha az

Biodegradable and biocompatible radiopaque iodinated poly-3-hydroxy butyrate: synthesis, characterization and in vitro/in vivo X-ray visibility

Erol, Arzu | Rosberg, Derya B. Hazer | Hazer, Baki | Göncü, Beyza S.

Article | 2019 | Polymer Bulletin , pp.79 - 86

Some novel radiopaque biodegradable and biocompatible iodinated polymers based on poly-3-hydroxy butyrate (PHB) were obtained. Following the attachment of diethanol amine to PHB, the hydroxyl ends were capped with 4-iodobenzoic acid and 2,3,5-tri-iodobenzoic acid. In this manner, tri-novel radiopaque polymers were obtained. The resulting polymers were structurally characterized by NMR technique. They were evaluated with respect to their possible use as radiopaque implant biomaterials indicating X-ray visibility in a noninvasive manner using routine X-ray absorption imaging techniques. These polymers exhibited good radiopacity with c . . .onventional imaging X-ray techniques in vivo. Additionally, biocompatibility of these iodinated polymers was also evaluated. There were no signs of infection or abscess formation on the surgical area. These novel radiopaque PHBs should be promising biomaterials for a new-generation radiopaque materials. © 2019, Springer-Verlag GmbH Germany, part of Springer Nature Daha fazlası Daha az

Autoxidized oleic acid bifunctional macro peroxide initiators for free radical and condensation polymerization. Synthesis and characterization of multiblock copolymers

Hazer, Baki | Ayyıldız, Elif | Eren, Melike | Canbay-Seçilmiş, Hale | Ashby, Richard D.

Article | 2019 | Journal of Polymers and the Environment27 ( 11 ) , pp.2562 - 2576

Autoxidation of unsaturated fatty acids gives fatty acid macroperoxide initiators containing two functionalities which can lead to free radical and condensation polymerizations in a single pot. The oleic acid macroperoxide initiator obtained by ecofriendly autoxidation (Pole4m) was used in both the free radical polymerization of styrene and the condensation polymerization with amine-terminated polyethylene glycol (PEGNH2) to obtain triblock branched graft copolymers. The narrow molar masses of the poly oleic acid-g-styrene (PoleS) and poly oleic acid-g-styrene-g-PEG (PoSG) graft copolymers were successfully obtained. The inclusion o . . .f oleic acid decreased the glass transition temperature of the polystyrene segment because of the plasticizing effect of oleic acid. In addition, a mechanical property of the copolymer was improved when compared with the pure PS. Structural characterization, morphology of the fracture surface, micelle formation, thermal analysis and molar masses of the obtained products were also evaluated. © 2019, Springer Science+Business Media, LLC, part of Springer Nature Daha fazlası Daha az

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