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WoS İndeksli Yayınlar Koleksiyonu

Permanent URI for this collectionhttps://hdl.handle.net/20.500.14901/698

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Browsing WoS İndeksli Yayınlar Koleksiyonu by Publisher "Amer Inst Physics"

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    The Alternative Methods for Disinfection of E. Coli
    (Amer Inst Physics, 2016) Yetim, Tuba; Gormez, Arzu; Gurkok, Sumeyra
    Recently, advanced oxidation processes have gained significant interest for bacterial inactivation. In the present study, the efficacy of sonolysis, photocatalysis and sonophotocatalysis was evaluated for disinfection of Escherichia coli O157:H7 strain. Sonophotocatalysis proved to be the most effective disinfection methods by generating greater amount of (OH)-O-center dot radical.
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    Electrical Characterization of In/P-Gase:Cd Single Crystal Grown by Bridgman/Stockbarger Method
    (Amer Inst Physics, 2017) Gurbulak, Bekir; Sata, Mehmet; Ashkhasi, Afsoun; Yildirim, Muhammet; Duman, Songul
    The temperature dependence of current voltage (I-V) characteristics of Au Ge/p-GaSe:Cd Schottky diode (SD) has been investigated in the temperature range of 40-360 K with a temperature step of 10 K under dark conditions. The characteristic parameters of the SD such as barrier height, ideality factor and series resistance have been determined from the I-V measurements. It has been shown that the ideality factor increases while the barrier height decreases with decreasing temperature. The values of series resistance obtained from modified Norde's function. Series resistance values increase with decreasing temperature.
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    Citation - WoS: 2
    Citation - Scopus: 3
    Growth and Structural Characterizations of GaSe and GaSe:Cd Single Crystals
    (Amer Inst Physics, 2017) Ashkhasi, Afsoun; Gurbulak, Bekir; Sata, Mehmet; Turgut, Gaven; Duman, Songul
    GaSe and GaSe:Cd single crystals used in this research were grown by using the Bridgman/Stockbarger method. All of the samples were freshly and gently cleaved with a razor blade from the grown ingots and no further polishing and cleaning treatments were required because of the natural mirror-like cleavage faces. The Samples were cleaved along the cleavage planes (001). The structure and lattice parameters of the undoped GaSe and GaSe:Cd semiconductors have been analyzed using a X-ray diffractometcr (XRD), Scanning electron microscopy (SEM) and energy dispersive X-rays (EDX) techniques. It is found that GaSe and GaSe:Cd crystals have hexagonal structure, quite close 20 peak values. XRD measurements indicate that there is an increase in peak intensities at specific annealing temperatures (500 degrees C). Cd doping causes a significant decrease in the XRD peak intensity.
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    Citation - WoS: 3
    Citation - Scopus: 4
    Isolation and Characterization of Novel Chitinolytic Bacteria
    (Amer Inst Physics, 2016) Gurkok, Sumeyra; Gormez, Arzu
    Chitin, a linear polymer of beta-1,4-N-acetylglucosamine units, is one of the most abundant biopolymers widely distributed in the marine and terrestrial environments. It is found as a structural component of insects, crustaceans and the cell walls of fungi. Chitinases, the enzymes degrading chitin by cleaving the beta-(1-4) bond, have gained increased attention due to their wide range of biotechnological applications, especially for biocontrol of harmful insects and phytopathogenic fungi in agriculture. In the present study, 200 bacterial isolates from Western Anatolia Region of Turkey were screened for chitinolytic activity on agar media amended with colloidal chitin. Based on the chitin hydrolysis zone, 13 isolates were selected for further study. Bacterial isolates with the highest chitinase activity were identified as Acinetobacter calcoaceticus, Arthrobacter oxydans, Bacillus cereus, Bacillus megaterium, Brevibacillus reuszeri, Kocuria erythromyxa, Kocuria rosea, Novosphingobium capsulatum, Rhodococcus bratislaviensis, Rhodococcus fascians and Staphylococcus cohnii by MIS and BIOLOG systems. The next aims of the study are to compare the productivity of these bacteria quantitatively, to purify the enzyme from the most potent producer and to apply the pure enzyme for the fight against the phytopathogenic fungi and harmful insects.