Novel enantioselective synthesis of cyclopropane amino acids and investigation of solvent effects and metathesis reactions in the presence of chiral lead tetracarboxylates in a ring-expansion methodology

Şeşenoğlu, Özge


Efficient synthesis of 1-alkoxycarbonyl-methyl-2-alkylpyrroles from dichloro- and methoxychloropropylalkyl ketones
Gadzhili, RA; Nadzhafova, RA; Sesenoglu, O (2002-01-01)
The condensation reaction of 2,3-dichloropropyl- and 2-methoxy-3-chloropropyl alkyl ketones with alkyl 2-aminoacetate salts leads to 1-alkoxy-carbonylmethyl-2-alkylpyrroles. These compounds, with various bases, gave 1-carbamoylmethyl-, 1-dialkylaminocarbonylmethyl-, 1-carbazoyl methyl-2-alkylpyrroles and potassium salt of 2-alkyl-pyrrolyl-1-acetic acid.
A new technique for line interference monitoring and reduction in biopotential amplifiers
Ider, Yusuf Ziya; Koymen, H. (Institute of Electrical and Electronics Engineers (IEEE), 1990-6)
Hardware developed to record the common mode line frequency signal on the body simultaneously with the ECG lead signals of a 15-channel computerized cardiograph is described. This interference reference signal and its quadrature, obtained by software, are linearly combined to be subtracted from any one of the channels to reduce the interference to below the quantization level of the 12 b A/D converter. Coefficients of the linear combination are estimated using linear regression, which is applied to the rela...
An investigation of microstructure, microhardness and biocompatibility characteristics of yttrium hydroxyapatite doped with fluoride
Toker, Sıdıka Mine; Evis, Zafer; Department of Biomedical Engineering (2010)
The aim of this study was to investigate the microstructure, microhardness and biocompatibility properties of nano hydroxyapatite (HA) doped with a constant yttrium (Y3+) and varying fluoride (F-) compositions. HA was synthesized via precipitation method and sintered at 1100C for 1 hour. Increased densities were achieved upon Y3+ doping while F- doping led to a decrease in densities. For structural analysis, XRD, SEM and FTIR spectroscopy examinations were performed. No secondary phases were observed in XR...
Analysis of koch fractal antennas
İrgin, Ümit; Birand, Mehmet Tuncay; Department of Electrical and Electronics Engineering (2009)
Fractal is a recursively-generated object describing a family of complex shapes that possess an inherent self-similarity in their geometrical structure. When used in antenna engineering, fractal geometries provide multi-band characteristics and lowering resonance frequencies by enhancing the space filling property. Moreover, utilizing fractal arrays, controlling side lobe-levels and radiation patterns can be realized. In this thesis, the performance of Koch curve as antenna is investigated. Since fractals a...
A mechanism for the enhanced attachment and proliferation of fibroblasts on anodized 316L stainless steel with nano-pit arrays
Ni, Siyu; Sun, Linlin; Ercan, Batur; Liu, Luting; Ziemer, Katherine; Webster, Thomas J. (Wiley, 2014-08-01)
In this study, 316L stainless steel with tunable nanometer pit sizes (0, 25, 50, and 60 nm) were fabricated by an anodization procedure in an ethylene glycol electrolyte solution containing 5 vol % perchloric acid. The surface morphology and elemental composition of the 316L stainless steel were characterized by scanning electron microscopy (SEM), atomic force microscopy (AFM), and X-ray photoelectron spectroscopy (XPS). The nano-pit arrays on all of the 316L stainless steel samples were in a regular arrang...
Citation Formats
Ö. Şeşenoğlu, “Novel enantioselective synthesis of cyclopropane amino acids and investigation of solvent effects and metathesis reactions in the presence of chiral lead tetracarboxylates in a ring-expansion methodology,” Ph.D. - Doctoral Program, Middle East Technical University, 2001.