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Bulunan: 246 Adet 0.074 sn
Koleksiyon : Fen Edebiyat Fakülte ... ✕
Koleksiyon [62]
İlgili Araştırmacılar [34]
Ambargo Durumu [1]
Tam Metin [2]
Yazar [90]
Yayın Türü [9]
Yayın Yılı [23]
Yayın Dili [2]
Dergi Adı [90]
Yayıncı [62]
Konu Başlıkları [90]

Synthesis of a novel macromonomer initiator for atom transfer radical polymerization: Self condensing and graft copolymerization

Allı, Abdulkadir | Hazer, Baki

A new macromonomer initiator for atom transfer radical polymerization (ATRP-MIM) based on polyethylene glycol (Mn= 660 Da) (PEG) was synthesized by the reaction of hydroxyl end of the mono-methacryloyl polyethylene glycol with 2-bromopropanoyl chloride leading to methacryloyl polyethylene glycol 2-bromopropanoyl ester (v-PEG-Br). Poly(ethylene glycol) functionalized with methacrylate at one end was reacted with 2-bromopropionyl chloride to form a macromonomeric initiator for ATRP. Self condensing ATRP-MIM polymerization yielded branched PEG with low cross-linked fraction (3-29 wt%). In the sam ...Daha fazlası

Makale 2009 Hacettepe Journal of Biology and Chemistry37 ( 1 ) , pp. 2 - 31 470 Görüntülenme
Erişime Açık

Synthesis and characterization of the poly(ethylene glycol) grafted unsaturated microbial polyesters

Kılıçay, Ebru | Hazer, Baki | Çoban, Burak | Scholz, Carmen

Pseudomonas oleovorans was grown with either 10-undecenoic acid alone or the equimolar mixture of octanoic acid and 10-undecenoic acid to obtain unsaturated poly(3- hydroxy alkanoates) (PHA)s; poly(3-hydroxy-10-undecenoate) (PHU) and poly(3-hydroxyoctanoate- co-3-hydroxy-10-undecenoate) (PHOU), respectively. The addition of bromine to olefinic double bond, by reacting the unsaturated PHA with bromine in homogeneous solution in dark, was readily carried out. The brominated PHA was reacted with polyethylene glycol (PEG) in the presence of a base to obtain PHA-g-PEG graft copolymers. The polymers ...Daha fazlası

Makale 2010 Hacettepe Journal of Biology and Chemistry38 ( 1 ) , pp. 9 - 17 541 Görüntülenme
Erişime Açık

Effects of some DNA gyrase inhibitors on the survival and development of Pimpla turionellae (Hymenoptera. Ichneumonidae) larvae reared on an artificial diet

Büyükgüzel, Kemal

Endoparazitoid bir zarkanatlı türü, Pimpla turionellae L., kimyasal yapısı bilinen sentetik besin ortamlarında aseptik şartlarda beslenerek, güçlü antibakteriyel ajanlar olan novobiyosin, nalidiksik ve oksolinik asitin böceğin yaşama ve gelişmesine ayrı ayrı etkileri inclendi. Beşinci evredeki larvaların yaşama yüzdesi antibiyotiklerin farklı miktalarını içeren besinler tarafından önemli derecede etkilenmemiştir. Novobiyosinin en düşük miktarını içeren besin pup ve ergin yüzdesini önemli derecede artırmıştır. Bu miktar aynı zamanda beşinci evreye ulaşmak için gereken süreyi kısaltmış, ancak la ...Daha fazlası

Makale 2002 Turkish Journal of Zoology26 ( 1 ) , pp. 1 - 126 580 Görüntülenme
Erişime Açık

Reactions of anionic living polymers with bromomethyl-functionalized benzoyl peroxides

Hazer, Baki | Hirao, Akira | Volga, Cüneyt

In order to synthesize benzoyl peroxide functionalized polystyrene (PSt), polyisoprene (PI) and poly(methyl methacrylate) (PMMA), anionic living PSt, PI, and PMMA were allowed to react with an excess amount of 4-(bromomethyl)benzoyl tert-butyl peroxide (BMtB) or bis[3,5-bis(bromomethyl)benzoyl] peroxide (BDBP) in tetrahydrofuran (THF) at -78°C. The results indicate that coupling reactions leading to dimers are significant during the reaction. Dimer formation was avoided when the living polystyrene was modified to the alcoholate anion by reaction with ethylene oxide (EO). © Wiley-VCH Verlag Gmb ...Daha fazlası

Makale 1999 Macromolecular Chemistry and Physics200 ( 1 ) , pp. 7 - 76 493 Görüntülenme
Erişime Açık

Molybdenum tetracarbonyl complexes with linear chain polyether-containing Schiff base ligands and their reactivity in the polymerization of methyl methacrylate

Menteş, Ayger | Sarbay, Mithat | Hazer, Baki | Arslan, Hülya

Mo(CO)6 was reacted with the Schiff base ligand obtained by condensation reaction of 2-acetyl- or benzoylpyridine with poly(propylene glycol)bis(2-aminopropyl ether) to obtain polymeric, dinuclear metal tetracarbonyl compounds. The long-chain Schiff base complexes are highly soluble even in non-polar solvents such as petroleum ether, diethyl ether and n-hexane. These complexes, as free-radical initiators, afforded methyl methacrylate polymerization in chlorinated solvents. Copyright © 2004 John Wiley & Sons, Ltd.

Makale 2005 Applied Organometallic Chemistry19 ( 1 ) , pp. 7 - 80 594 Görüntülenme

The synthesis of PHA-g-(PTHF-b-PMMA) multiblock/graft copolymers by combination of cationic and radical polymerization

Macit, Hülya | Hazer, Baki | Arslan, Hülya | Noda, Isao

A new and promising method for the diversification of microbial polyesters based on chemical modifications is introduced. Poly(3-hydroxy alkanoate)-g-(poly(tetrahydrofuran)-b-poly(methyl methacrylate)) (PHAg-(PTHF-b-PMMA)) multigraft copolymers were synthesized by the combination of cationic and free radical polymerization. PHA-g-PTHF graft copolymer was obtained by the cationic polymerization of THF initiated by the carbonium cations generated from the chlorinated PHAs, poly(3-hydroxybutyrate-co-3- hydroxyvalerate) (PHBV), and poly(3-hydroxybutyrate-co-3-hydroxyhexanoate) (PHBHx) in the prese ...Daha fazlası

Makale 2009 Journal of Applied Polymer Science111 ( 5 ) , pp. 2 - 2317 819 Görüntülenme
Erişime Açık

One-step synthesis of triarm block copolymers via simultaneous reversible-addition fragmentation chain transfer and ring-opening polymerization

Öztürk, Temel | Göktaş, Melahat | Hazer, Baki

One-step synthesis of star copolymers by reversible addition-fragmentation chain transfer (RAFT) and ring-opening polymerization (ROP) by using a novel dual initiator is reported. Triarm block copolymers comprising one polystyrene (or polyacrylamide) arm and two poly(b-butyrolactone) arms were synthesized in one-step by simultaneous RAFT polymerization of styrene (St) (or acrylamide, designated as AAm) and ROP of b-butyrolactone (BL) in the presence of a novel trifunctional initiator, 1,2-propanediol ethyl xanthogenate (RAFT-ROP agent). This dual initiator was obtained through the reaction of ...Daha fazlası

Makale 2010 Journal of Applied Polymer Science117 ( 3 ) , pp. 1 - 1645 688 Görüntülenme
Erişime Açık

Hyperbranched homo and thermoresponsive graft copolymers by using ATRP-macromonomer initiators

Allı, Sema | Allı, Abdulkadir | Hazer, Baki

Macromonomer initiators behave as macro cross-linkers, macro initiators, and macromonomers to obtain branched and cross-linked block/graft copolymers. A series of new macromonomer initiators for atom transfer radical polymerization (MIM-ATRP) based on polyethylene glycol (M n = 495D, 2203D, and 4203D) (PEG) were synthesized by the reaction of the hydroxyl end of mono-methacryloyl polyethylene glycol with 2-bromo propanoyl chloride, leading to methacryloyl polyethylene glycol 2-bromo propanoyl ester. Poly (ethylene glycol) functionalized with methacrylate at one end was reacted with 2-bromoprop ...Daha fazlası

Makale 2012 Journal of Applied Polymer Science124 ( 1 ) , pp. 5 - 548 786 Görüntülenme
Erişime Açık

The effects of boric acid-induced oxidative stress on antioxidant enzymes and survivorship in Galleria mellonella

Hyršl, Pavel | Büyükgüzel, Ender | Büyükgüzel, Kemal

Larvae of the wax moth, Galleria mellonella (L.), were reared from first instar on a diet supplemented with 156, 620, 1,250, or 2,500 ppm boric acid (BA). The content of malondialdehyde (MDA, an oxidative stress indicator), and activities of the antioxidant enzymes [superoxide dismutase (SOD), catalase (CAT), glutathione S-transferase (GST), and glutathione peroxidase (GPx)] were determined in the fat body and hemolymph in the 7th instar larvae and newly emerged pupae. Relative to control larvae, MDA was significantly increased in larval hemolymph, larval and pupal fat body, but decreased in t ...Daha fazlası

Makale 2007 Archives of Insect Biochemistry and Physiology66 ( 1 ) , pp. 2 - 31 1158 Görüntülenme
Erişime Açık

The influence of dietary alpha-solanine on the waxmoth galleria mellonellal

Büyükgüzel, Ender | Büyükgüzel, Kemal | Erdem, Meltem | Adamski, Zbigniew | Adamski, Zbigniew | Marciniak, Pawel | Ziemnicki, Kazimierz

Plant allelochemicals are nonnutritional chemicals that interfere with the biology of herbivores. We posed the hypothesis that ingestion of a glycoalkaloid allelochemical, ?-solanine, impairs biological parameters of greater wax moths Galleria mellonella. To test this idea, we reared wax moths on artificial diets with 0.015, 0.15, or 1.5 mg/100 g diet of ?-solanine. Addition of ?-solanine to the diet affected survival of seventh-instar larvae, pupae, and adults; and female fecundity and fertility. The diet containing the highest ?-solanine concentration led to decreased survivorship, fecundity ...Daha fazlası

Makale 2013 Archives of Insect Biochemistry and Physiology83 ( 1 ) , pp. 1 - 24 1331 Görüntülenme
Erişime Açık

Nitroxide-mediated copolymerization of styrene and pentafluorostyrene initiated by polymeric linoleic acid

Allı, Abdulkadir | Allı, Sema | Becer, C. Remzi | Hazer, Baki

Polymeric linoleic asit graft copolymers were synthesized via a nitroxide-mediated radical polymerization (NMRP) method in the presence of 2,2-6,6-tetramethylpiperidinyl-1-oxy (TEMPO). For this purpose, PLina-ox was exposed to polymerization with styrene (Sty) or Sty and pentafluorostyrene (F5Sty) in the presence of TEMPO by NMRP method in order to obtain PLina-g-PSty and PLina-g-PF5Sty-g-PSty graft copolymers with controlled structure and low polydispersity. Chain extension study was evaluated. Principal parameters, such as monomer concentration, initiator concentration, and polymerization ti ...Daha fazlası

Makale 2016 European Journal of Lipid Science and Technology118 ( 2 ) , pp. 2 - 287 863 Görüntülenme
Erişime Açık

Novel Enzymatic Rhodium Modified Poly(styrene-g-oleic amide) Film Electrode for Hydrogen Peroxide Detection

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

Newly synthesized poly(styrene-g-oleic amide) was coated onto a rhodium nanoparticle modified glassy carbon (GC) surface for the fabrication of horseradish peroxidase based biosensor used for hydrogen peroxide detection. The rhodium modifed electrode presented ten times higher signal than unmodified electrode even at low elecrtroactive enzyme quantity by enhancing the electron transfer rate at the applied potential of -0.65 V. The biosensor designed by under the optimized rhodium electrodeposition time exhibited a fast response less than 5 s, an excellent operational stability with a relative ...Daha fazlası

Makale 2017 Electroanalysis29 ( 10 ) , pp. 2 - 2384 1074 Görüntülenme
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