Synthesis and In Vitro Antioxidant Evaluation of New 1,3,5-Tri-{2-methoxy-4-[(4,5-dihydro-1H-1,2,4-triazol-5-on-4-yl)-azomethine]-phenoxycarbonyl}-Benzene Derivatives

Nine new 4,5-dihydro-1H-1,2,4-triazol-5-one derivatives were synthesized and characterized by elemental analyses and IR, 1H-NMR, 13C-NMR and UV spectral data. The synthesized compounds were analyzed for their in vitro potential antioxidant activities in three different methods. Those antioxidant activities were compared to standard antioxidants such as BHA, BHT and α-tocopherol. Compounds 4e, 5a and 5d showed best activity for iron binding. In addition, the compounds 4 were titrated potentiometrically with tetrabutylammonium hydroxide (TBAH) in four non-aqueous solvents (isopropyl alcohol, tert-butyl alcohol, acetone and N,N-dimethyl formamide). Thus, the half-neutralization potential values and the corresponding pKa values were determined in all cases

A contribution to the knowledge of the turkish aphid (Hemiptera: Aphidoidea) fauna

As a result of the study carried out between 2007 and 2009 in the eastern part of the Black Sea Region of Turkey, 4 genera and 17 species were determined as new records for the Turkish aphid fauna. New recorded species are Aphis arbuti, Aphis cytisorum, Aphis kachkoulii, Cavariella digitata, Chaitophorus kapuri, Chaitophorus longisetosus, Cinara pinivora, Illinoia lambersi, Myzus beybienkoi, Neobetulaphis pusilla, Phyllaphis fagifoliae, Pseudessigella brachychaeta, Schizaphis rotundiventris, Symdobious oblongus, Thecabius lysimachiae, Thelaxes californica and Tinocallis takachihoensis. With these new records, the number of genera increased to 134 and the number of the species in the Turkish aphid fauna amounted to about 480. Since Turkey has a huge range of agricultural crops and a great diversity in its natural flora, research conducted on the Turkish aphid fauna has current and future indications for plant protection. © 2011 The Authors. Journal compilation © 2011 OEPP/EPPO

Investigation of Buildup Factor in Gamma-Ray Measurement

Gamma ray measurement is an important issue in nuclear technology, since it is widely used in industry, medicine, agriculture, education research, and some military applications. Gamma ray is also needed to build radiation protection, which is very useful for human health. When gamma radiation penetrates through shielding material, it generates two radiation components within or beyond the shield, namely: the uncollided and the collided photons. Therefore, the buildup factor is an important parameter for gamma ray measurement. Buildup factor is defined as the ratio of the total number of particles at a given point to the number of uncollided particles, at that same point. In this work, we evaluate the gamma-ray buildup factors for copper (Cu-29), as a function of energy, for 0.511, 0.662, 1.275 MeV, by using cesium and sodium radioactive sources. The results show that the value of energy buildup factor decreases with increasing gamma energy, and increases with increasing thickness. Moreover, it was found that at high energies (1.275 MeV), the absorption buildup factor is at minimum when the energy is at high level. The results also reveal that there is no contribution from the scattering photons to the value of buildup factor, in general, at low intensity levels, when the geometry structure is built well. While for bad geometry, the detector measures intensity, which is greater than that described by the main linear attenuation coefficient, because the scattered photons will be detected as well. All in all, in order to get rational results, a well geometry should be used for the future applications

Aphid (Hemiptera: Aphidoidea) Spices of the Urla District of İzmir Region

As a result of the study organized to determine aphid fauna of the Urla district of İzmir region, 38 species were identified. Of these species, Chaitophorus saliciniger (Knowlton, 1927) and Aphis serpylli Koch, 1954 are new records for Turkey aphid fauna. With these new records, the total number of aphid species in Turkey comes up to 450. Findings of the presented study and other recent studies showed that with the detailed study Turkey aphid fauna will be substantially increased

THE APHID FAUNA OF TURKEY: AN UPDATED CHECKLIST

WOS: 000304339100034This study provides a comprehensive list of Turkey aphid fauna (Hemiptera: Aphididea). A total of 466 species and 12 subspecies belonging to 141 genera and 13 tribes, are listed. The list includes all records from 1903 to 2011. The family of Aphididae comprise the highest number of species (457), followed by Adelgidae (6) and Phylloxeridae (3), respectively. Inside Aphididae, the tribe of Macrosiphini is the richest group with 197 species, whereas the tribe of Cinarini has only one species. The number of aphid species actually reported for Turkey is lower than recorded for neighboring countries, suggesting that further faunistic studies needs to improve informations on this topic

molecularly imprinted polymer

Amyloid beta-protein, a polypeptide, is known as the reason of neuronal death and is widely recognized as a biomarker of Alzheimer's disease. In this study, a simple and rapid electrochemical biosensor based on delaminated titanium carbide MXene (d-Ti3C2TX MXene) and multi-walled carbon nanotubes (MWCNTs) composite including molecularly imprinted polymers (MIPs) was formed for amyloid-beta having 42-amino-acid-peptide (A beta(42)) protein sensing. After d-Ti3C2TX/MWCNTs composite was prepared by mixing the colloidal solution of d-Ti3C2TX MXene with MWCNTs (mass ratio 3:1), some analytic methods such as x-ray diffraction (XRD), x-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), UV/Vis spectroscopy, atomic force microscopy (AFM), cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) were performed for characterizations of d-Ti3C2TX MXene, MWCNTs and d-Ti3C2TX/MWCNTs composite. Later, A beta(42) imprinted d-Ti3C2TX/MWCNTs/GCE was prepared in a mixture including 100.0 mM pyrrole (monomer) containing 25.0 mM A beta(42) (template) in phosphate buffer (0.1 M, pH 7.5) by CV method for 25 cycles. A beta(42) imprinted electrode showed a linear range of 1.0 fg mL(-1) - 100.0 fg mL(-1) and detection limit (LOD) of 0.3 fg mL(-1) were obtained. A beta(42) imprinted electrode was examined in terms of stability, repeatability, reproducibility and reusability. Finally, A beta(42) imprinted biosensor was applied to plasma samples for A beta(42) analysis.C1 [Ozcan, Nermin; Yola, Mehmet Lutfi] Iskenderun Tech Univ, Fac Engn & Nat Sci, Dept Biomed Engn, Antakya, Turkey.[Medetalibeyoglu, Hilal] Kafkas Univ, Fac Sci & Letters, Dept Chem, Kars, Turkey.[Akyildirim, Onur] Kafkas Univ, Fac Engn & Architecture, Dept Chem Engn, Kars, Turkey.[Atar, Necip] Pamukkale Univ, Fac Engn, Dept Chem Engn, Denizli, Turkey

Optimal dividend policy with random interest rates

Several recent papers have studied the impact of macroeconomic shocks on the financial policies of firms. However, they only consider the case where these macroeconomic shocks affect the profitability of firms but not the financial markets conditions. We study the polar case where the profitability of firms is stationary, but interest rates and issuance costs are governed by an exogenous Markov chain. We characterize the optimal dividend policy and show that these two macroeconomic factors have opposing effects: all things being equal, firms distribute more dividends when interest rates are high and less when issuing costs are high

The Effect of Pumice Rate on the Gamma Absorption Parameters of Concrete

Since the technology concerning gamma radiation showed a rapid development, it became a necessity to be protected from it. One of the common shielding materials for this purpose is concrete. This study aims to give the effect of pumice rate on the gamma radiation attenuation coefficients of normal concrete (ρ = 2.476 g $cm^{-3}$) containing different rates of pumice mineral. Pumice, for which the Gölcük region in Isparta province is rich, is a volcanic originated spongy and porous mineral. Although it is a light material, it has a high comprehensive strength and heat resistance. So it became a common construction material in buildings. In the study, the variation of attenuation coefficients for concretes of different pumice rates were measured for 662, 1173 and 1332 keV photons using a NaI(Tl) detector. The experimental values were compared with the theoretical ones obtained by XCOM code

molecularly imprinted polymer for electrochemical analysis of citrinin

Citrinin (CIT) is mutagenic and resistant to decomposition. In addition, it is founded in many foods and causes the significant diseases in human body. In this report, an imprinted electrochemical surface based on glassy carbon electrode (GCE) modified with palladium nanoparticles (PdNPs) involved in 5-(4-Hydroxybenzylidenamino)-2-mercaptobenzimidazole (BZ) functionalized graphene quantum dots (GQD5) was formed for CIT analysis. The formation of the surfaces was characterized by scanning electron microscope (SEM), transmission electron microscope (TEM), electrochemical impedance spectroscopy (EIS) and X-ray photoelectron spectroscopy (XPS). CIT imprinted electrochemical surface was formed in the presence of 80.0 mM pyrrole as monomer and 20.0 mM CIT as template. The linearity range and the detection limit (LOD) of the developed nanosensorwere calculated as 1.0 x 10(-9)-5.0 x 10(-9) M and 2.0 x 10(-19) M, respectively. (C) 2017 Elsevier B.V. All rights reserved

the Analysis of Quercetin

We aimed a novel electrochemical sensor based on iron nanoparticles (FeNPs) and 2-aminoethanethiol (2-AET) functionalized graphene oxide (2-AETGO). The methods such as transmission electron microscope (TEM), scanning electron microscope (SEM), x-ray photoelectron spectroscopy (XPS), reflection-absorption infrared spectroscopy (RAIRS), electrochemical impedance spectroscopy (EIS) and the x-ray diffraction (XRD) method were used for the characterizations of nanocomposites. The linearity and the detection limit of quercetin (QR) were 1.0x10(-8) - 1.0x10(-7) M and 2.0x10(-9) M, respectively. The modified glassy carbon electrode (FeNPs/2-AETGO/GCE) was applied to the determination of QR in food sample such as apple juice