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    ANTIFUNGAL ACTIVITY OF GEOTHERMAL FLUIDS FROM DIFFERENT REGIONS OF TURKEY
    (North Carolina State Univ Dept Wood & Paper Sci, 2012) Var, Ahmet Ali; Yalçın, Mesut; Şen, Selim; Taşçıoğlu, Cihat
    Antifungal effects of geothermal fluids obtained from the Ankara, Afyon, Denizli, and Eskisehir regions of Turkey on white-rot (Trametes versicolor, MAD-697) and brown-rot (Coniophora puteana, FPRL 11E) fungus (Basidiomycetes) were studied. Fungal experiments were performed on kraft paper and Scots pine wood (Pinus sylvestris L.). We used non-concentrated geothermal water and concentrated geothermal water (via evaporation) in ratios of 25%, 50%, and 75%. To evaluate the results, we measured the concentration of specific minerals in the geothermal fluids such as boron (B), arsenic (As), copper (Cu), sulfate (SO4), sodium (Na), chloride (Cl), fluoride (F), potassium (K), and ammonia (NH3). The highest antifungal effect was observed for a geothermal fluid from the Denizli region, followed by Ankara, Afyon, and Eskisehir, in decreasing order. Antifungal properties of GFs are thought to be associated with the type and amount of mineral substances. In addition, the antifungal effects increased with increasing concentrations of geothermal water.
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    Changes in Some Physical Properties of Impregnated Particleboards of Accelerated Aging Tests
    (Düzce Üniversitesi, 2012) Var, Ahmet Ali
    The aim of this study was to investigate effects of various wood impregnation substances on changes in weight, thickness, moisture and density of particleboards in accelerated aging tests. As wood impregnating agent, the following materials were used for production of experimental particleboards: colophony, alkyd resin, ammonium sulfate, boric acid, borax, tanalith-CBC, boric acid+borax, tanalith-CBC+boric acid+borax. The physical properties were measured before and after artificial aging tests. The results were analyzed by using SPSS statistical program by computer. In conclusion, the participation rates of wood impregnating agent affected significantly deteriorations in weight, thickness and density, except for moisture. Compared to controls, the deteriorations decreased significantly for colophony and alkyd resin, but no difference for boric acid+borax and tanalith-CBC+boric acid+borax. For weight, moisture and density, the lowest losses were obtained with 1.0%, 1.5% and 3.0% adding rates of alkyd resin (10%), respectively. The highest losses were found with 1.5% adding rate of boric acid+borax (2.5%+2.5%). For thickness, while minimum increase occurred with 1.5% adding rate of colophony (10%), maximum increase was obtained with 0.6% adding rate of tanalith-CBC+boric acid+borax (5.0%+2.5%+2.5%). nbsp;
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    EFFECTS OF HOT-COLD OIL TREATMENT ON BIOLOGICAL RESISTANCE AND PHYSICAL PROPERTIES OF BRUTIA PINE SAPWOOD
    (Univ Bio-Bio, 2021) Var, Ahmet Ali; Yalcin, Mesut; Yalcin, Omer Umit; Demir, Mehmet
    This study investigated the physical properties of hot-cold oil-treated Brutia pine sapwood (Pinus brutia) and its biological resistance against wood-decay fungi. Weight percent gain, density, water absorption, and volumetric shrinking were chosen as the physical properties of the wood. White rot (Trametes versicolor) and brown rot (Neolentinus lepideus) were selected as the wood-decay fungi. Two different temperatures and two different time intervals were determined for the hot-cold oil treatment. Castor oil (Ricinus communis), flaxseed oil (Oleum linii), and a mixture of the two were used as the treatment oils (the medium of the hot-cold treatment). The results showed that the physical properties of the hot-cold oil-treated samples improved significantly compared to those of the control samples. In addition, after exposure to the decay fungi, the mass loss of the hot-cold flaxseed oil-treated samples decreased significantly more than in either the untreated samples or those treated with the other oils. There was a significant increase in the water repellent effectiveness and dimensional stability of the Brutia pine sapwood with all hot-cold oil treatments, but the hot-cold castor oil treatment appeared to have had no effect on decay resistance. A hot-cold oil treatment using flaxseed oil or a mixture including it could be a suitable method for improvement of the water repellent effectiveness, dimensional stability, and decay resistance of Brutia pine sapwood, as they both reduced the water uptake and the mass loss against the wood-decay fungi compared to the results of the control samples.