Güncel Gönderiler: Fen Edebiyat Fakültesi
Toplam kayıt 1429, listelenen: 681-700
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AC losses in a commercial Bi: 2223/Ag tape
(Institute of Physics Publishing, 2009)We have investigated the effect of temperature, field amplitude, frequency and orientation of the field on AC losses in a commercial Bi:2223/Ag tape. The measurements were performed using an AC susceptometer. The experimental ... -
Structural analysis of reactive dye species retained by the basic alumina surface
(Springer, 2009)The alumina-dye composites were prepared by treating the basic alumina with the water solutions of Reactive Red 120 (RR 120) and Reactive Blue 15 (RB 15) dyes. The bands of low intensities in the 1400-1600 cm-1 region and ... -
Determination of adsorptive properties of a Turkish Sepiolite for removal of Reactive Blue 15 anionic dye from aqueous solutions
(Elsevier, 2009)Reactive Blue 15 (RB 15) adsorption on the Turkish Sepiolite was carried out by batch equilibrium technique. IR spectrum and surface area measurement of the composite of dye-sepiolite (Turkish) pointed out that dye species ... -
Variation of K X-ray fluorescence cross-sections of Cu, Y and Ba in Y Ba2Cu3O7-δ superconductor
(Elsevier, 2009)K X-ray fluorescence cross-sections of Cu, Y and Ba elements were measured in CuO, Y 2O3, BaCO3 compounds and Y Ba2Cu3O7-? superconductor samples (nonreacted agent, calcined and sintered states). A superconductor sample ... -
Class 1 and class 2 integrons and plasmid-mediated antibiotic resistance in coliforms isolated from ten rivers in northern Turkey
(2009)We aimed to determine the molecular mechanisms of antibiotic resistance in coliforms isolated from ten rivers in northern region of Turkey. A total of 183 isolates were tested for antimicrobial susceptibility by disk ... -
Determination of the protonation constants of triazole derivatives in non-aqueous solvents
(2009)Different 17 triazole derivatives were titrated with tetrabutylammonium hydroxide in four non-aqueous solvents (isopropyl alcohol, rert-butyl alcohol, N,N-dimethylformamide and acetonitrile), using Potentiometric method. ... -
Synthesis, characterization and cyclization reactions of some new bisthiosemicarbazones
(Arkat, 2009)The reaction of trans-1, 4-dichloro-2-butene 1 with selected phenols affords (E)-1, 4-bis(aryloxy)-2-butenes 2a-d which are converted into bis-thiosemicarbazones 3a-h via the reactions with thiosemicarbazide and 4-methyl ... -
Synthesis of some new 1,2,4-triazoles, their Mannich and Schiff bases and evaluation of their antimicrobial activities
(Elsevier, 2009)4-Phenyl-5-pyridin-4-yl-4H-1,2,4-triazole-3-thiol (3) was obtained in basic media via the formation of 2-isonicotinoyl-N-phenylhydrazinecarbothioamide (2), and converted to some alkylated derivatives (4a,b) and Mannich ... -
Photochemistry of nitro-substituted (E)-2-azachalcones with theoretical calculations and biological activities
(Elsevier, 2009)Four new stereoselective dimerization products (4a-c, 5) of m- and p-nitro-substituted (E)-2-azachalcones (2 and 3) were synthesized and tested for antimicrobial and antioxidant activities. Compounds 1-3 showed very good ... -
The polarization of X-rays and magnetic photoionization cross-sections for L3 sub-shell
(Elsevier, 2009)The alignment of atoms with inner-shell vacancies resulting from ionization by photons was investigated by measuring the anisotropic emission of L shell X-ray lines. The X-ray line intensities were measured using an Si(Li) ... -
Synthesis of some new 1,3,4-thiadiazol-2-ylmethyl-1,2,4-triazole derivatives and investigation of their antimicrobial activities
(Elsevier, 2009)4-Amino-2-[(5-arylamino-4,5-dihydro-1,3,4-thiadiazol-2-yl)methyl]-5-(4-methylphenyl)-2,4-dihydro-3H-1,2,4-triazol-3-ones (3a-c) were obtained in acidic media via the formation of 2-[(4-amino-3-aryl-5-oxo-4,5-dihydro-1H-1 ... -
Relationships between vegetation zonation and edaphic factors in a salt-marsh community (Black Sea coast)
(2009)The effects of pH, electrical conductivity (EC), soluble cations (Na +, K +, Ca 2+, Mg 2+), and soluble anions (HCO 3 -, Cl -, SO 4 2-) on vegetation zonation in a salt-marsh community (Black Sea coast) were investigated ... -
PCR based idendification and discrimination of Caranx rhonchus (Pisces, Carangidae) based on nuclear and mtDNA sequences
(2009)PCR based nuclear and mitochondrial DNA markers are used to clarify cases of misidentification of adult individuals of fish species with morphological similarities. This problem prevails in the case of false scad (Caranx ... -
A new DNA polymerase i from Geobacillus caldoxylosilyticus TK4: Cloning, characterization, and mutational analysis of two aromatic residues
(Springer, 2009)DNA polymerase I gene was cloned and sequenced from the thermophilic bacterium Geobacillus caldoxylosilyticus TK4. The gene is 2,634 bp long and encodes a protein of 878 amino acids in length. The enzyme has a molecular ... -
Synthesis of 1,2,4-Triazole derivatives and determination of protonation constant
(2009)A microwave irradiation method has been developed for the synhesis of some 1,2,4-triazole derivatives using environmentally benign solvent ethanol in open vessels. Twelve 1,2,4-triazole derivatives were synthesized in good ... -
Family of surface with a common null geodesic
(2009)We analyzed the problem of finding a surfaces family through a null curve with Cartan frame. We constructed a differential equation system such that a given null curve is an isogeodesic curve on a surface. In addition, ... -
Effects of sexual reproduction on growth and vegetative propagation in Arum Maculatum L. (Araceae): Insitu removal experiments
(2009)We investigated the effects of sexual reproduction on vegetative propagation and relative somatic cost in Arum maculatum L. (Araceae). Two groups were selected as control and experimental. The spadices of individuals in ... -
Determination of mass attenuation coefficients, effective atomic and electron numbers for some natural minerals
(Elsevier, 2009)The total mass attenuation coefficients (?m) for SiO2 {Quartz (1 1 0 1), Quartz (1 1 0 0) and Quartz (0 0 0 1)}, KAlSi3O8 {Orthoclase (0 1 0), Orthoclase (1 0 0)}, CaSO4·2H2O (gypsum), FeS2 (pyrite) and Mg2Si2O6 (pyroxene) ... -
Phylogeny of neurergus crocatus and neurergus strauchii in Turkey based on morphological and molecular data
(2009)We described the phylogeny of the salamandrid genus Neurergus in Turkey using statistical analyses on morphometric characters and a molecular analysis based on 12S and 16S rRNA genes. Two different species, Neurergus ... -
Dynamic phase diagrams of a mixed spin-1 and spin-5/2 Ising system in an oscillating magnetic field
(2009)We study the nonequilibrium aspects of the kinetics of a mixed spin-1 and spin-5/2 Ising system, including the biquadratic nearest-neighbor pair interaction (K) and the crystal-field interaction (D), under the presence of ...
