Erişime Açık

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

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

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 w ...Daha fazlası

Makale 2019 Cellulose26 ( 8 ) , pp. 5 - 5084 729 Görüntülenme

Synthesis and characterization of novel rod-coil (tadpole) poly(linoleic acid) based graft copolymers

İnce, Özge | Akyol, Elvan | Sulu, Elvan | Şanal, Timur | Hazer, Baki

Synthesis of novel poly (styrene)-g-poly(linoleic acid)-g-poly(ethylene glycol) amphiphilic rod-coil tadpole and poly (styrene)-g-poly(linoleic acid)-g-poly (dimethyl siloxane) double hydrophobic rod-coil tadpole graft copolymers have been reported. In the first step, poly(linoleic acid) peroxide macro initiator (PLina) was prepared by exposing linoleic acid to air at room temperature for three weeks, in view of the autoxidation process. In the second step, poly styrene-g-poly linoleic acid graft copolymer (PLinaS) was prepared by the polymerization of styrene initiated by PLina. In the third ...Daha fazlası

Makale 2016 Journal of Polymer Research23 ( 1 ) , pp. 1 - 10 848 Görüntülenme

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

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 polyethylen ...Daha fazlası

Makale 2019 Journal of Polymer Research26 ( 5 ) 825 Görüntülenme

Solid phase extraction of uranium on a new brush type graft copolymer and spectrophotometric determination of its in water samples

Tüzen, Mustafa | Esra, Bağda | Hazer, Baki

A new versatile solid phase extraction and spectrophotometric determination of uranium (VI) was proposed with using poly(caprolactone-b-vinyl benzyl chloride-g-dimethyl amino ethyl methacrylate), poly(CL-b-VB-g-DMAEMA), amphiphilic brush type block/graft copolymer. The method is based on the adsorption of uranium(VI)-pyrocatechol violet complex on surface on the adsorbent. The parameters such as pH, amount of ligand and copolymer, sample volume were optimized. Detection limit, preconcentration factor and relative standard deviation were found as 0.45 µg L-1, 100 and 3.8 %, respectively. Adsorp ...Daha fazlası

Makale 2016 Journal of Radioanalytical and Nuclear Chemistry310 ( 3 ) , pp. 1 - 1263 631 Görüntülenme

Development and nature of preservice chemistry teachers' pedagogical content knowledge for nature of science

Demirdöğen, Betül | Hanuscin, Deborah L | Uzuntiryaki-Kondakçı, Esen | Köseoğlu, Fitnat

The purpose of this case study is to delve into the complexities of the early development of preservice chemistry teachers’ science teaching orientations, knowledge of learners, knowledge of instructional strategies, and knowledge of assessment during a two-semester intervention designed to enhance their pedagogical content knowledge (PCK) for teaching nature of science (NOS). Thirty preservice chemistry teachers enrolled in a Research in Science Education course participated in the study. Qualitative data sources included responses to an open-ended instrument, interviews, observations, and ar ...Daha fazlası

Makale 2016 Research in Science Education46 ( 4 ) , pp. 5 - 612 450 Görüntülenme

Hereditary haemochromatosis gene (HFE) H63D mutation shows an association with abnormal sperm motility

Gunel-Ozcan A. | Basar M.M. | Kısa U. | Ankaralı H.C.

The aim of this study was to screen infertile men for HFE H63D mutation in correlation with clinical characteristics of infertile men (sperm concentration, sperm motility, morphology, testicular volume, Follicle Stimulating Hormone (FSH), Luteinizing Hormone (LH) and total Testosterone levels) and find out if the HFE H63D mutation has an effect on male infertility. After excluding hormonal treatment, any scrotal pathology, having any systemic diseases such as diabetes mellitus, sickle cell anemia and microdeletions of the Y chromosome, a total of 148 infertile men with age range between 17 and ...Daha fazlası

Makale 2009 Molecular Biology Reports36 ( 7 ) , pp. 1 - 1714 318 Görüntülenme

Modeling and predicting seasonal ionospheric variations in Turkey using artificial neural network (ANN)

Inyurt S. | Sekertekin A.

The aim of this study was to model and predict seasonal ionospheric total electron content (TEC) using artificial neural network (ANN). Within this scope, GPS observations acquired from ANKR GPS station (Turkey) in 2015 were utilized to model TEC variations. Considering all data for each season, training and testing data were set as 80% and 10%, respectively, and the rest of the data were used to estimate TEC values using extracted mathematical models of ANN method. Day of Year (DOY), hour, F107 cm index (solar activity), Kp index and DsT index (magnetic storm index) were considered as the inp ...Daha fazlası

Makale 2019 Astrophysics and Space Science364 ( 4 ) 325 Görüntülenme

Molybdenum and tungsten(0) tetracarbonyl complexes with pyridyl amine Schiff base ligands

Mentes A.

Molybdenum and tungsten tetracarbonyl compounds of the cis-[M(CO)4L2] (M = Mo, L2 = apmi, appi, apmi-Ph, appi-2-OMe, apmi-1-Me-1-Ph, bpmi, bppi, bpmi-Ph, bppi-2-OMe, bpmi-1-Me-1-Ph, bpai, M = W, L2 = apmi, appi, appi-2-OMe, bppi, bppi-2-OMe)† type have been prepared and characterised by 1H n.m.r., i.r., FAB-MS spectroscopy and by microanalysis.

Makale 1999 Transition Metal Chemistry24 ( 1 ) , pp. 7 - 80 197 Görüntülenme

Is vegetation collapse on Borneo already in progress?

Becek K. | Horwath A.B.

Vegetation and tropical forests in particular have a central role in mitigating the effects of increasing levels of atmospheric CO 2 . Photosynthesis is the fundamental process during which CO 2 is taken up by plants and fixed into carbohydrates. The effect of temperature on the rate of photosynthesis in different plant species is directly related to degree-days (D-D) as well as the leaf area index (LAI). Throughout the dry season, the reduced net primary productivity is tightly correlated with increasing D-D, while the reduction in soil moisture leads to progressive canopy thinning, indicated ...Daha fazlası

Makale 2017 Natural Hazards85 ( 2 ) , pp. 1 - 1290 334 Görüntülenme

Effect of ceramic particle size and applied pressure on time to complete infiltration of liquid aluminium into SiC powder compacts

Candan E. | Atkinson H.V. | Jones H.

Monitoring of pressurized advance of liquid aluminium into SiC particle compacts of mean particle sizes 12.8, 22.8 and 36.7 µm was carried out under applied pressures of 400 to 900 kPa. Infiltration time of liquid aluminium in the compact was recorded by computer logging the output from pairs of open ended wires with a potential difference between them. Results showed that time necessary to complete infiltration in the compacts decreased with increasing particle size and increasing applied pressure. Experimental results are in reasonably good agreement with model predictions. © 2000 Kluwer Aca ...Daha fazlası

Makale 2000 Journal of Materials Science35 ( 19 ) , pp. 4 - 4960 245 Görüntülenme

Evaluation of macular and peripapillary choroidal thickness, macular volume and retinal nerve fiber layer in acromegaly patients

Yazgan S. | Arpaci D. | Celik H.U. | Isik I.

Purpose: To evaluate macular volume, retinal nerve fiber layer, and macular and peripapillary choroidal thickness in acromegaly patients. Method: In this prospective, case–control study, 31 patients with acromegaly and 32 healthy subjects were recruited. Only right eyes were evaluated. Macular choroidal thickness (CT) was measured at three points, peripapillary CT was measured at eight points, and macular volume was measured at nine areas in the central 6 mm circle zone by spectraldomain optical coherence tomography (OCT). Retinal nerve fiber layer (RNFL) was measured automatically at six segm ...Daha fazlası

Makale 2018 International Ophthalmology38 ( 2 ) , pp. 6 - 625 560 Görüntülenme

Clinical outcomes of trabeculectomy vs. Ahmed glaucoma valve implantation in patients with penetrating keratoplasty: (Trabeculectomy vs. Ahmed galucoma valve in patients with penetrating keratoplasty)

Akdemir M.O. | Acar B.T. | Kokturk F. | Acar S.

The aim of this study was to compare the visual outcomes, intraocular pressure (IOP), and endothelial cell loss caused by trabeculectomy (TRAB) and Ahmed glaucoma valve (AGV) implantation in patients who had previously undergone penetrating keratoplasty (PKP). The data from all patients who underwent surgical treatment of glaucoma after PKP were reviewed at the Cornea Department of Haydarpasa Numune Education and Research Hospital. Eighteen patients who had undergone surgical treatment of glaucoma after PKP were included in this retrospective study. Time between PKP and glaucoma surgeries, vis ...Daha fazlası

Makale 2016 International Ophthalmology36 ( 4 ) , pp. 5 - 546 439 Görüntülenme

Filtreler

Koleksiyon [12]

İlgili Araştırmacılar [16]

Ambargo Durumu [1]

Tam Metin [2]

Yazar [90]

Yayın Türü [2]

Yayın Yılı [11]

Yayın Dili [1]

Dergi Adı [22]

Yayıncı [1]

Konu Başlıkları [90]