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    Frequency of left atrial myxoma with concomitant coronary artery disease
    (Springer, 2003) Erdil, N; Ates, S; Cetin, L; Demirkilic, U; Sener, E; Tatar, H
    Purpose. Simultaneous coronary artery bypass grafting with a resection of left atrial myxoma has been rarely reported. The ages and the symptoms of patients who have left atrial myxomas and coronary artery disease are similar. In this report, we present our cases of left atrial myxoma with concomitant coronary artery disease who were all treated surgically. Methods. Between September 1998 and January 2001, 11 patients were surgically treated after being diagnosed to have left atrial myxoma. Routine coronary angiography was performed on all patients preoperatively. In four patients concomitant coronary artery disease was identified. At surgery we performed coronary artery bypass grafting after a resection of left atrial myxoma in three patients. Results. All patients were weaned from cardiopulmonary bypass without any difficulty. The postoperative course was uneventful. The follow-up period was 17 +/- 10 months (range 3-32 months). All patients were symptom-free and no recurrence of myxoma was detected. Conclusion. Based on our experience, cardiovascular surgeons should be aware of the concomitance of these diseases. It is therefore recommended that coronary angiography should be performed on all patients who present with left atrial myxomas.
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    Midterm experience with the Sorin Bicarbon heart valve prosthesis for rheumatic disease
    (Edizioni Minerva Medica, 2003) Erdil, N; Cetin, L; Ates, S; Demirkilic, U; Sener, E; Tatar, H; Cakir, B
    Background In this study, we present a single center experience with Bicarbon bileaftet valve in 307 patients with rheumatic heart disease. Methods. Between August 1998 and September 2000, 307 patients underwent heart valve replacement using the Bicarbon bileaflet valve (Sorin Biomedica, Saluggia, Italy) with an average age of 47.19+/-13.21 years (range 14 to 80 years), consisting of 147 males and 160 females at Alkan Hospital, Cardiovascular Surgery Department. Aortic valve replacement (AVR) was performed in 77 patients, mitral valve replacement (MVR) in 156 patients and double valve replacement (DVR) in 74 patients. Results. The early mortality rate was 3.3% (10/307) and there was no late mortality. The actuarial survival rate, including hospital mortality, was 96.74+/-1.01% for the whole group, 96.5+/-1.5% for the MVR group, 97.4+/-1.8% for the AVR group and 97.3+/-1.9% for the DVR group at 35 months. One patient had obstructive valve thrombosis with MVR. The 35 months actuarial freedom from valve thrombosis was 99.58+/-0.4% for the whole group. Four patients were reoperated and the 35 months actuarial freedom from reoperation was 98.53+/-0.7% for the whole group, 98.65+/-0.9% for the MVR group, 96.73+/-02% for the DVR group and 100% for the AVR group. No instances of perivalvular leak, hemolysis, endocarditis or embolism were observed during the entire follow-up period. Mean follow-up duration was 16.5+/-7.9 months (ranged 4 to 35 months). Conclusions. We have presented our mid-term results with the Sorin Bicarbon bileaflet valve in patients with rheumatic heart disease, which provided good clinical performance combined with meticulous patient care and advanced surgical techniques.
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    The modification of aluminium tri-sec-butoxide with different alcohols and chelating ligands: Hydrolysis and condensation of the products
    (Marcel Dekker Inc, 1997) Sayilkan, H; Arpac, E; Sener, E
    In this work, alcoholysis reactions of aluminium-sec-butoxide, Al(OBu-s)(3), with 2-ethoxyethanol (EtOCH2CH2OH) and 2-butoxyethanol (BuOCH2CH2OH), complexation reactions of Al(OBu-s)(3) and of alcohol-modified Al(OBu-s)(3) with methacrylic acid (MAC) and ethyl acetoacetate (EAAH), and the hydrolysis reactions of Al(OBu-s)(3) and modified Al(OBu-s)(3) are studied in some detail. Alcoholysis reactions of Al(OBu-s)(3) were performed with different mole ratios of 2-ethoxyethanol and 2-butoxyethanol at room temperature and combining ratios were found to be 1:3 [Al(OBu-s)(3):alcohol] by H-1 NMR analyses. Al(OBu-s)(3) and alcohol-modified Al(OBu-s)(3) were reacted at room temperature with equimolar amounts of methacrylic acid and ethyl acetoacetate and the products were characterized by H-1 NMR, GC, FT-IR and elemental analyses. Hydrolysis-condensation reactions of the various compounds thus formed were studied in detail and the products were characterized by gas chromatography, Karl Fisher coulometric titrations, thermal analysis and FT-IR.
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    New metal alkoxides
    (Kluwer Academic Publ, 1999) Sayilkan, H; Senre, S; Sener, E; Arpaç, E
    In this work, (a) hydrolyses of Ti(OEt)(4) and Zr(OPrn)(4) with different amounts of water, (b) complexation of the same alkoxides with varying amounts of methacrylic acid, (c) hydrolysis of the complexation products with varying amounts of water, and subsequent polymerization, (d) adsorption capacities of the hydrolysis products (a and c) for aqueous aniline and phenol, were investigated. It was found that condensation reactions which follows the hydrolysis reactions, were alcohol condensations. The products were characterized in detail. Adsorption of aniline and phenol were compared for thermally conditioned powder of the products and some powders coated with 3-glycidyloxypropyltrimethoxysilane. It was observed that the extent of adsorption was influenced significantly by the temperature at which the adsorbents were calcinated by the coating of their surfaces. (C) 1999 Kluwer Academic Publishers.
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    Semiconductivity in YBa2-xSrxCu3Oy
    (Amer Inst Physics, 1996) Ulug, A; Ulug, B; Sener, E
    Structural and electrical properties of YBa(2-x)Sr(x)Cu3O(y) prepared under ambient oxygen pressure were systematically investigated for 0 less than or equal to x less than or equal to 2.0. Samples with high Sr contents, x greater than or equal to 1.7, showed semiconductive properties with an activation energy of similar to 150 meV at high temperature, T greater than or equal to 80 K. At low temperatures, T less than or equal to 80 K, activation energy dropped to similar to 3.00 and similar to 0.85 meV for x=1.7-1.8 and x=1.9-2.0, respectively. It is argued that YSr2Cu3Oy is likely to have a tetragonal structure and that the disorder introduced by Sr substitution affects electrical conduction, which involves charge hopping between the CuO chains at high Sr contents. (C) 1996 American Institute of Physics.
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    Simplex optimization of reaction variables in the production of cobalt(III) acetate in a bipolar packed-bed reactor
    (Elsevier Science Bv, 1996) Sener, E; Karagozler, AE; Pekel, AT
    Cobalt(III) acetate production in a bipolar-packed bed reactor was investigated in terms of conversion ratio of Co(II) acetate, current yield and energy consumption. An experimental optimization was performed on the conversion ratio by the use of a sequential simplex method; cell voltage, concentrations of Co(II) acetate and sodium acetate, water content of the solution, temperature and the Faraday number of charge per mole of Co(II) acetate were chosen as reaction variables. The maximum conversion ratio in 36 electrolyses was 71.6% which could not be further improved by changing the levels of the selected variables. A record of the other performance parameters showed that the conditions for the highest conversion ratio were also suitable for satisfactory current and energy yields.
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    The sol-gel synthesis and application of some anticorrosive coating materials
    (Consultants Bureau, 2003) Sayilkan, H; Sener, S; Sener, E; Sülü, M
    On the basis of organic-inorganic monomers, we develop new coatings aimed at the protection of iron and aluminum surfaces against the action of atmospheric and chemical factors. The coatings are first sprayed and then polymerized. The quality of the coatings and their chemical resistance are checked in natural and model media according to the ASTM standard. In most cases, the durability of the coatings is satisfactory.
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    Synthesis of some new sol-gel derived metal-organic compounds and their hydrolysis-condensation reactions
    (Chemical Soc Japan, 2000) Sener, S; Sayilkan, H; Sener, E
    This work comprised the following parts: a) hydrolysis of Ti(OEt)(4) and Zr(OPr)(4) with different amounts of water, b) complexation of the same alkoxides with varying amounts of 2-methylbutanoic and 3-methylbutanoic acids, and c) hydrolysis of complexation products with varying amounts of water. All reactions were carried out at room temperature. The complex products were [Ti(OEt)(3.2)(2-MBA)(0.8)], [Ti(OEt)(3.2)(3-MBA)(0.8)], [Zr(OPr)(2.5)(2-MBA)(1.5)], and [Zr(OPr)(3.3)(3-MBA)(0.7)] (2-MBA: 2-methylbutanoate, 3-MBA: 3-methylbutanoate). The products were characterized by H-1 NMR, FT-IR, and elemental analysis. While Ti(OEt)(4), [Ti(OEt)(3.2)(2- MBA)(0.8)], and [Ti(OEt)(3.2)(3-MBA)(0.8)] were hydrolyzed with 1.30, 1.28, and 1.30 mol of water, Zr(OPr)(4), [Zr(OPr)(2.5)(2-MBA)(1.5)], and [Zr(OPr)(3.3)(3-MBA)(0.7)] were hydrolyzed with 2.0, 0.96, and 1.10 mol of water, respectively. These products were characterized by gas chromatography (GC), Karl-Fischer coulometric titrations, and thermal analysis.