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Articles 7861 - 7890 of 10319
Full-Text Articles in Physical Sciences and Mathematics
Synthesis And Properties Of Novel Photosensitive Poly(Amide-Imide)S Containing Chalcone Moiety And Aromatic Diamines In The Main Chain, Khalil Faghihi, Zohreh Mozafari
Synthesis And Properties Of Novel Photosensitive Poly(Amide-Imide)S Containing Chalcone Moiety And Aromatic Diamines In The Main Chain, Khalil Faghihi, Zohreh Mozafari
Turkish Journal of Chemistry
Six new poly(amide-imide)s were synthesized by the polycondensation reaction of 1,3-bis[4,4'-bis(trimellityimido) phenyl]-2-propenone (6) with 3,3'-diamino diphenyl sulfone (7a), 4,4'-diamino diphenyl sulfone (7b), 4,4'-diamino diphenyl ether (7c), 1,5-diamino naphthalene (7d), 6-phenyl-1,3,5-triazine (7e), and 6-choloro-1,3-diazine (7f) in a medium consisting of N-methyl-2- pyrrolidone, triphenyl phosphite, calcium chloride, and pyridine. The polycondensation reaction produced a series of novel poly(amide-imide)s (8a-f) in high yield and with inherent viscosities between 0.42 and 0.62 dL/g. The resulting polymers were characterized by elemental analysis, viscosity measurement, solubility testing, thermo-gravimetric analysis (TGA & DTG), FT-IR, and UV-VIS spectroscopy.
Production Of (S)-(-)-1-(1´-Napthyl) Ethanol By Rhodotorula Glutinis Isolate Using Ram Horn Peptone, Esabi̇ Başaran Kurbanoğlu, Kani̇ Zi̇lbeyaz, Namudar I. Kurbanoğlu, Mesut Taşkin, Hamdullah Kiliç
Production Of (S)-(-)-1-(1´-Napthyl) Ethanol By Rhodotorula Glutinis Isolate Using Ram Horn Peptone, Esabi̇ Başaran Kurbanoğlu, Kani̇ Zi̇lbeyaz, Namudar I. Kurbanoğlu, Mesut Taşkin, Hamdullah Kiliç
Turkish Journal of Chemistry
The bioreduction of 1-acetonaphthone 1 by locally isolated Rhodotorula glutinis strains using ram horn peptone (RHP) gave (S)-(-)-1-(1´-naphthyl) ethanol (2), an important pharmaceutical intermediate. R. glutinis strains were isolated from the water of fermented Salix leaves. Optimum fermentation conditions for the production of 2 were 200 rpm, 32 °C, and pH 6.5. The production of 2 with excellent enantiomeric excess (>99%), and good conversion (100%) and yield (78%) under optimum conditions was achieved up to preparative scale via a fermenter. Wide temperature, pH, time, and agitation ranges did not affect the enantiomeric excess (ee) of the bioreduction product. A …
High Yielding Oxidative Deprotection Of Silyl And Pyranyl Ethers To Their Corresponding Carbonyl Compounds With Strontium Manganate In The Presence Of Aluminium Chloride In Solution And Under Solvent-Free Conditions, Mostafa Gholizadeh, I. Mohmmadpoor Baltork
High Yielding Oxidative Deprotection Of Silyl And Pyranyl Ethers To Their Corresponding Carbonyl Compounds With Strontium Manganate In The Presence Of Aluminium Chloride In Solution And Under Solvent-Free Conditions, Mostafa Gholizadeh, I. Mohmmadpoor Baltork
Turkish Journal of Chemistry
Strontium manganate (SrMnO_4) in the presence of aluminium chloride (AlCl_3) is an efficient reagent for the high yielding oxidative deprotection of aromatic and aliphatic silyl and pyranyl ethers into their corresponding carbonyl compounds, in solution and under solvent-free conditions.
Preparation Of Palladium Composite Membranes On Pore Structure Modified And Non-Modified Supports By Electroless Plating Procedure, Sali̇ha Kiliçarslan, Osman Muzaffer Afyon, Meltem Doğan
Preparation Of Palladium Composite Membranes On Pore Structure Modified And Non-Modified Supports By Electroless Plating Procedure, Sali̇ha Kiliçarslan, Osman Muzaffer Afyon, Meltem Doğan
Turkish Journal of Chemistry
The effects of pore structure of the support on the plating morphology, thickness, and composition were investigated in an electroless plating procedure. Some of the plating studies were carried out directly on commercially available porous glass supports, while others were performed on modified supports. Two modification steps with alumina were applied on tubular supports. Formation of a 60-\mu m-thick layer on the modified support was detected by SEM analysis after the first 2 plating steps, while layer formation was not observed on the non-modified support. It was shown that the formation of a new layer started on the modified support, …
Examination Of The Electroanalytic Performance Of Carbon Nanotube (Cnt) Modified Carbon Paste Electrodes As Xanthine Biosensor Transducers, Ülkü Anik, Meli̇ha Çubukçu
Examination Of The Electroanalytic Performance Of Carbon Nanotube (Cnt) Modified Carbon Paste Electrodes As Xanthine Biosensor Transducers, Ülkü Anik, Meli̇ha Çubukçu
Turkish Journal of Chemistry
The effect of multi-walled carbon nanotube (MWCNT) and single-wall carbon nanotube (SWCNT) on carbon paste electrode (CPE) electrochemical response was examined by introducing various portions of CNT into the CPE. The optimum electrode structure was determined by comparing the prepared electrodes´ electroanalytical performance towards ferricyanide. Then these optimum compositions were modified with xanthine oxidase (XO) enzyme for obtaining a xanthine biosensor. After the optimization of biosensor working conditions, the developed systems were characterized for xanthine. Linearity was obtained in the concentration range between 1 and 100 \mu M xanthine with an RSD value of 3.35% for MWCNT-CPE, while with SWCNT-CPE …
Potentiometric Determination Of The Stability Constants Of Lanthanide Complexes With Iminodiacetic Acid In Water And Dioxane-Water Mixtures, Sevgi̇ Arzik, Ebru Mavi̇oğlu Ayan, A. Sedat Çelebi̇
Potentiometric Determination Of The Stability Constants Of Lanthanide Complexes With Iminodiacetic Acid In Water And Dioxane-Water Mixtures, Sevgi̇ Arzik, Ebru Mavi̇oğlu Ayan, A. Sedat Çelebi̇
Turkish Journal of Chemistry
The protonation constants of iminodiacetic acid (H_2 ida) and the stability constants of its complexes with Nd(III), Sm(III), Gd(III), Dy(III), and Er(III) ions at metal/ligand mole ratios of 1:1, 1:2, and 1:3 at 25 °C and 0.1 M ionic strength in aqueous medium and 20%, 45%, and 70% w/w dioxane-water mixtures were determined by the potentiometric method using the BEST computer program. The stability constants of the complexes that formed increased as the dioxane content increased. The stability of all the analogues' complexes, both in aqueous medium and in dioxane-water mixtures, were in the order of Nd(III) < Sm(III) < Gd(III) < Dy(III) < Er(III).
Synthesis And Cloning Of A Small Bacillus Pheromone Gene (Comx_{Ro-B-2}) By Primer-Dimer Formation With Pcr, Devri̇m Demi̇r Dora, Tanil Kocagöz, Fi̇li̇z Öner
Synthesis And Cloning Of A Small Bacillus Pheromone Gene (Comx_{Ro-B-2}) By Primer-Dimer Formation With Pcr, Devri̇m Demi̇r Dora, Tanil Kocagöz, Fi̇li̇z Öner
Turkish Journal of Chemistry
ComX pheromone is the major extracellular signaling peptide stimulating transformation in response to high cell density in Bacillus species. In this study, Bacillus mojavensis ComX_{(RO-B-2)} pheromone gene was cloned to pGEMT-Easy vector based on TA cloning of PCR products. The gene encoding 11 amino acid peptides of Bacillus mojavensis RO-B-2 strain ComX pheromone (GLQIYTNWVPS) was obtained by PCR amplification of 2 primers complementary to each other at their 3' end. This eliminated the need for the original bacterial gene as DNA template for PCR. The amplified PCR products were ligated directly without any modification by T4 DNA ligase into pGEMT-Easy …
Preparation, Characterization, And Potentiometric Titrations Of Some New Di-[3-(3-Alkyl/Aryl-4,5-Dihydro-1h-1,2,4-Triazol-5-One-4-Yl)-Azomethinphenyl] Isophthalate/Terephthalate Derivatives, Haydar Yüksek, Özlem Gürsoy Kol
Preparation, Characterization, And Potentiometric Titrations Of Some New Di-[3-(3-Alkyl/Aryl-4,5-Dihydro-1h-1,2,4-Triazol-5-One-4-Yl)-Azomethinphenyl] Isophthalate/Terephthalate Derivatives, Haydar Yüksek, Özlem Gürsoy Kol
Turkish Journal of Chemistry
3-Alkyl(Aryl)-4-amino-4,5-dihydro-1H-1,2,4-triazol-5-ones (2) reacted with di-(3-formylphenyl) isophthalate (3) and di-(3-formylphenyl) terephthalate (6) to afford the corresponding 6 novel di-[3-(3-alkyl/aryl-4,5-dihydro-1H-1,2,4-triazol-5-one-4-yl)- azomethinphenyl] isophthalates (4) and 6 novel di-[3-(3-alkyl/aryl-4,5- dihydro-1H-1,2,4-triazol-5-one-4-yl)-azomethinphenyl] terephthalates (7), respectively. The acetylation reactions of compounds 4 and 7 were investigated, and 5 and 8 type compounds were obtained, respectively. The new compounds synthesized were characterized by using IR, ^1H-NMR, ^{13}C-NMR, and UV spectral data together with elemental analysis. In addition, to investigate the effects of solvents and molecular structure upon acidity, compounds 4 and 7 were titrated potentiometrically with tetrabutylammonium hydroxide in 5 non-aqueous solvents (isopropyl alcohol, tert-butyl alcohol, N,N-dimethylformamide, acetone, …
Microwave-Assisted Synthesis Of 1,4´-Diazaflavone And N-Alkyl Derivative Pigments With Anti-Microbial Activity, Nuran Yayli, Osman Üçüncü, Nuretti̇n Yayli, Emi̇ne Demi̇r, Zi̇hni̇ Demi̇rbağ
Microwave-Assisted Synthesis Of 1,4´-Diazaflavone And N-Alkyl Derivative Pigments With Anti-Microbial Activity, Nuran Yayli, Osman Üçüncü, Nuretti̇n Yayli, Emi̇ne Demi̇r, Zi̇hni̇ Demi̇rbağ
Turkish Journal of Chemistry
1,4'-Diazaflavone pigment (2) was synthesized by a simple environmentally friendly microwave-assisted one-pot method for the cyclization of 2'-amino (E)-4''-aza-chalcone (1) under solventless conditions using K-10 clay. In addition, 10 new N-alkyl (C_{5-12, 14-15}) substituted 1,4' -diazaflavonium bromide pigments (3-12) were prepared from compound 2 or directly from compound 1, with corresponding alkyl halides in acetonitrile under reflux. The anti-microbial activity of compounds 1-12 was tested. The N-alkyl substituted 1,4' -diazaflavonium bromides (3-12) showed good antimicrobial activity against the gram-positive bacteria tested with minimal bactericidal concentration (MBC) values for the reference antibiotic kanamycin. The optimum length of the alkyl chain for …
Stability Of Hickson Groups Of Galaxies, Ibrahim Selim, Naseer Iqbal
Stability Of Hickson Groups Of Galaxies, Ibrahim Selim, Naseer Iqbal
Turkish Journal of Physics
In this work we have used the Viril theorem to investigate the dynamical stability of Hickson compact groups of galaxies. The average luminous mass of the galaxies member is approximately 1.3 \times 0^{11} M_{\odot} and average total luminous mass of group is approximately 4.6 \times 0^{11} M_{\odot}. The virial theorem has used to estimate the virial mass. The average Virial mass of group of galaxies is approximately 6.3 \times 0^{13} M_{\odot} This is attributed to the presence of large amount of dark matter which is more than 90% in this group. Hickson compact groups of galaxies are unstable system due …
Nonlinear Two-Mode Squeezed Vacuum States As Realization Of Su(1,1) Lie Algebra, Gamal Mohamed Abd Al-Kader, Abdel-Shafy Fahmy Obada
Nonlinear Two-Mode Squeezed Vacuum States As Realization Of Su(1,1) Lie Algebra, Gamal Mohamed Abd Al-Kader, Abdel-Shafy Fahmy Obada
Turkish Journal of Physics
Nonlinear extensions of the two-mode squeezed vacuum states (NTMSVS's) are constructed and special cases of these states are discussed. We have constructed the NTMSVS's realization of SU(1,1) Lie algebra. Two cases of the definition are considered for unitary and non-unitary deformation operator functions. Some nonclassical properties of these states are discussed.
The Ampullinid Gastropod Globularia (Swainson 1840) From The Late Thanetian-Early Ilerdian Kırkkavak Formation (Polatlı-Ankara) Of The Tethyan Realm, Yavuz Okan, İzzet Hoşgör
The Ampullinid Gastropod Globularia (Swainson 1840) From The Late Thanetian-Early Ilerdian Kırkkavak Formation (Polatlı-Ankara) Of The Tethyan Realm, Yavuz Okan, İzzet Hoşgör
Turkish Journal of Earth Sciences
Ampullinid gastropods are useful in correlating the Palaeogene marine strata of Central Anatolia. Ampullinid gastropods are found in the Late Paleocene-Early Eocene Kırkkavak Formation in the Macunköy area (Polatlı, west of Ankara). In the Haymana-Polatlı Basin, a variety of Globularia (Swainson 1840) species is described from the upper part of the Kırkkavak Formation, including G. sireli n.sp. The other taxa are G. vapincana (d´Orbigny 1850), G. grossa (Deshayes 1864) and G. crassatina (Lamarck 1804). The Kırkkavak fauna is known in western and central Europe, and central Asia. Some of the ampullinid gastropods and associated cerithid and neritid gastropods as well …
Critical State Models For Intergrain Junctions Of Polycrystalline Superconductors By Third Harmonic Ac Susceptibility Measurements, Ioseb R. Metskhvarishvili
Critical State Models For Intergrain Junctions Of Polycrystalline Superconductors By Third Harmonic Ac Susceptibility Measurements, Ioseb R. Metskhvarishvili
Turkish Journal of Physics
High harmonic response of high-T_c and Chevrel-phase polycrystalline superconductors are measured in the presence of small ac excitation field and dc magnetic field applied on it. The aim of this work is to study the Josephson weak link behavior and compare the two systems in order to understand the granular nature of polycrystalline superconductors. Critical state models are used to explain the nonlinear magnetic response in polycrystalline superconductors.
The Asymptotic Iteration Method For The Eigenenergies Of The Complex Potential V(X) = \Gamma X^4 + I \Beta X^3 + I \Alpha X, Abdallah Jamiel Sous
The Asymptotic Iteration Method For The Eigenenergies Of The Complex Potential V(X) = \Gamma X^4 + I \Beta X^3 + I \Alpha X, Abdallah Jamiel Sous
Turkish Journal of Physics
Recently, three complex potentials V(x) = i x^3,V(x) = i x^3 + i \alpha x, and V(x) = x^4 + i \alpha x have been studied in the literature. Here, we combine these potentials in one. With the aid of the asymptotic iteration method we have numerically calculated the eigenenergies of the new complex potential. The obtained numerical results are compared with those obtained by using the WKB, EMM, and MRF methods and found to be in an excellent agreement. We discuss how an adjustable parameter \zeta can help to improve our results.
Yo-Yo Tectonics Of The Niğde Massif During Wrenching In Central Anatolia, Donna L. Whitney, Paul J. Umhoefer, Christian Teyssier, Annia K. Fayon
Yo-Yo Tectonics Of The Niğde Massif During Wrenching In Central Anatolia, Donna L. Whitney, Paul J. Umhoefer, Christian Teyssier, Annia K. Fayon
Turkish Journal of Earth Sciences
Yo-yo tectonics occurs in wrench zones in response to switches between transpression and transtension or to changes in the geometries of faults during these modes of deformation, and involves multiple cycles of burial and exhumation. The Niğde Massif, Turkey, is a spectacular example of a tectonic yo-yo: it experienced two complete cycles of burial and exhumation in a zone of oblique displacement. The two cycles, one regional and one more local in scale, together occurred over > 80 m.y., from Cretaceous burial to Miocene cooling and exhumation. Temperature-time paths calculated using apatite fission track age and length data, combined with published …
Petrogenesis Of The Kösedağ Pluton, Suşehri-Ne Sivas, East-Central Pontides, Turkey, Durmuş Boztuğ
Petrogenesis Of The Kösedağ Pluton, Suşehri-Ne Sivas, East-Central Pontides, Turkey, Durmuş Boztuğ
Turkish Journal of Earth Sciences
The Kösedağ syenite crops out as a shallow-seated pluton within the Eocene volcano-sedimentary rocks and is unconformably overlain by Lower Miocene limestones in the Suşehri-NE Sivas region, east-central Pontides. It consists of syenites and quartz syenites with a phaneritic, porphyritic texture characterized by K-feldspar megacrysts set in a coarse- to medium-grained groundmass comprising K-feldspar, plagioclase, clinopyroxene, amphibole, biotite and quartz. Major element geochemistry data reveal a high-K, alkaline, metaluminous to slightly peraluminous character, with a low Aluminum Saturation Index (ASI) value. The main solidification process, which modified the composition of magma during crystallization, was fractional crystallization, in which syenites solidified …
Palaeoecology Of Coal-Bearing Eocene Sediments In Central Anatolia (Turkey) Based On Quantitative Palynological Data, M. Serkan Akki̇raz, Mi̇ne Sezgül Kayseri̇, Funda Akgün
Palaeoecology Of Coal-Bearing Eocene Sediments In Central Anatolia (Turkey) Based On Quantitative Palynological Data, M. Serkan Akki̇raz, Mi̇ne Sezgül Kayseri̇, Funda Akgün
Turkish Journal of Earth Sciences
In this study, the lignite-bearing Yoncalı formation between Yozgat and Sorgun, in central Anatolia has been palynologically examined. Based on 37 outcrop samples, quantitative palynological studies recognized 64 genera and 136 palynoflora species in the palynological assemblage, which indicated a Middle-?Late Eocene age. This paper also presents a quantitative palaeovegetation and palaeoclimate reconstruction for the Middle-?Upper Eocene coal occurrences of Central Anatolia on the basis of palynomorph assemblages. The diversified floral and ecological characteristics of the pollen taxa indicates that the Middle-?Upper Eocene formations in central Anatolia were characterized by the presence of a complex mangrove swamp with contributions by …
The Evolution Of Travertine Masses In The Sivas Area (Central Turkey) And Their Relationships To Active Tectonics, Levent Mesci̇, Hali̇l Gürsoy, Orhan Tatar
The Evolution Of Travertine Masses In The Sivas Area (Central Turkey) And Their Relationships To Active Tectonics, Levent Mesci̇, Hali̇l Gürsoy, Orhan Tatar
Turkish Journal of Earth Sciences
Sıcak Çermik, Delikkaya and Sarıkaya are important travertine fields with active hot springs located 31 km west of Sivas. Based on their morphology, most of the travertines are classified as fissure-ridge travertines. Eroded sheet-type, terraced, and self-built channel types of travertine are also present at a few locations. Faults and fissures formed in the underlying İncesu Formation, and fissures developing in the fissure-ridge travertines are linked to one another. Tectonic deformation forming the fissure-ridge travertines resulted from NE-SW extension associated with a NW-SE compressional regime related to the Central Anatolian Thrust Belt and Sivas Backthrust. U/Th series age dating results …
Punctuated Exhumation And Foreland Basin Formation And Infilling In (Circum)-Central Anatolia (Turkey) Associated With The Neo-Tethyan Closure, Durmuş Boztuğ, Haluk Temi̇z, Raymond Jonckheere, Lothar Ratscbacher
Punctuated Exhumation And Foreland Basin Formation And Infilling In (Circum)-Central Anatolia (Turkey) Associated With The Neo-Tethyan Closure, Durmuş Boztuğ, Haluk Temi̇z, Raymond Jonckheere, Lothar Ratscbacher
Turkish Journal of Earth Sciences
Apatite fission-track data indicate that the (circum)-central Anatolian granitoids (CAG) were exhumed during successive shortening phases following continent-continent collisions within the Neo-Tethyan domain in central and east-central Anatolia. The Early to Middle Paleocene exhumation of the CAG is thought to be a consequence of the collision between the Tauride-Anatolide platform (TAP) and the Eurasian plate (EP) following the consumption of the İzmir-Ankara-Erzincan strand of the northern Neo-Tethys. The Oligocene exhumation documented by the data for the Kösedağ pluton in east-central Anatolia is considered to be related to the compression due to continuing convergence between the EP and TAP which seems …
The Earthquake Catalogues For Turkey, Onur Tan, M. Cengi̇z Tapirdamaz, Ahmet Yörük
The Earthquake Catalogues For Turkey, Onur Tan, M. Cengi̇z Tapirdamaz, Ahmet Yörük
Turkish Journal of Earth Sciences
The earthquake data from instrumental records in the last 40 years indicate the general seismicity of the earth. However, examining historical records is necessary to understand long-term seismicity. Catalogue studies about historical earthquakes in Turkey are limited. All these catalogues are on printed paper and a digital database has not yet been prepared. On the other hand, there is no common database for the focal mechanism solutions of the recent destructive earthquakes (Mw>=5.5) in the region. The present study aims to prepare two new digital databases for earth scientists so that the earthquake parameters can be reached from a …
Masses Of Charged Leptons And Gauge Mixing Parameters, Cvavb Chandra Raju
Masses Of Charged Leptons And Gauge Mixing Parameters, Cvavb Chandra Raju
Turkish Journal of Physics
It is shown that the electroweak physics of the electron and the muon is based on the left-right gauge model with the mixing parameters 0.2254 and 0.2746. These mixing parameters are determined by the masses of the electron and the muon. The electroweak physics of the Tau-lepton and its left-handed neutrino is based on the gauge group SU(2)_L XU(1).The mixing parameter for this gauge model is 0.5 and is determined by the mass of the charged Tau-lepton. The W and Z bosons that mediate the electroweak physics of Tau-lepton and its neutrino have masses 173.5 GeV and 245.4 GeV, respectively.
Characterization Of Thin Film Al/P-Cdte Schottky Diode, M. G. Mahesha, V. B. Kasturi, G. K. Shivakumar
Characterization Of Thin Film Al/P-Cdte Schottky Diode, M. G. Mahesha, V. B. Kasturi, G. K. Shivakumar
Turkish Journal of Physics
A study has been made on the behavior of Al/p-CdTe thin film junction grown by thermal evaporation method. I-V characteristics show that the Al makes Schottky contact with p-CdTe. The variation of junction capacitance with frequency and voltage has been studied to evaluate the barrier height. The activation energy and band gap have been estimated by studying variation of resistivity with temperature. Using all these data, band diagram of Al/p-CdTe has been proposed.
Theoretical Study Of Electronic Properties Of The Semi-Conductors Aln And Gan With The Empirical Pseudopotential Method Epm, Kaddour Bencherif, Mohamed Sehil, Hamza Abid, Mohamed Elhadi Louhibi
Theoretical Study Of Electronic Properties Of The Semi-Conductors Aln And Gan With The Empirical Pseudopotential Method Epm, Kaddour Bencherif, Mohamed Sehil, Hamza Abid, Mohamed Elhadi Louhibi
Turkish Journal of Physics
The electronic structure of binary compounds AlN and GaN are presented. We have used the empirical pseudo-potential method. Good agreement between the calculated results and experiment is obtained. The charge densities are presented for the sum of the four valence bands of both AlN and GaN.
Synthesis Of New Azo Dyes And Copper(Ii) Complexes Derived From Barbituric Acid And 4-Aminobenzoylhydrazone, Bülent Kirkan, Ramazan Gup
Synthesis Of New Azo Dyes And Copper(Ii) Complexes Derived From Barbituric Acid And 4-Aminobenzoylhydrazone, Bülent Kirkan, Ramazan Gup
Turkish Journal of Chemistry
Four new azo dyes, L^1, L^2, L^3, and L^4, were prepared by linking benzaldehyde p-aminobenzoylhydrazone (3) and p-hydroxybenzaldehyede p--aminobenzoylhydrazone (4) to barbituric acid and 1,3-dimethylbarbituric acid through diazo-coupling reactions. Reactions of the azo-dyes with copper chloride and bidentate ligand, 1,10-phenanthroline, produced mixed-ligand dinuclear complexes with general stoichiometry [Cu_2L(phen)_2]Cl_2 (7, 8, 9, and 10). The structures of both azo dyes and their complexes were identified by elemental analyses, FT-IR, ^1H-NMR, UV-VIS, magnetic susceptibility, and mass spectral data.
One Step Synthesis Of Some 2,5,6-Trisubstituted-1,3-Dioxin-4-Ones, Ahmet Şener, İshak Bi̇ldi̇ri̇ci̇, Hasan Genç, Nuretti̇n Mengeş, Siddik Eski̇noba
One Step Synthesis Of Some 2,5,6-Trisubstituted-1,3-Dioxin-4-Ones, Ahmet Şener, İshak Bi̇ldi̇ri̇ci̇, Hasan Genç, Nuretti̇n Mengeş, Siddik Eski̇noba
Turkish Journal of Chemistry
A number of novel 2,5,6-trisubstituted-1,3-dioxin-4-one derivatives were synthesized via one step reactions between dibenzoylmethane or benzoylacetone and oxalyl chloride in refluxing solvents containing various aldehydes.
Investigation Of Solid State Synthesis And Characterizations Of Novel Sodium Rare-Earth Oxyphosphates, Semi̇h Seyyi̇doğlu, Maci̇t Özenbaş, Ayşen Yilmaz
Investigation Of Solid State Synthesis And Characterizations Of Novel Sodium Rare-Earth Oxyphosphates, Semi̇h Seyyi̇doğlu, Maci̇t Özenbaş, Ayşen Yilmaz
Turkish Journal of Chemistry
A new orthorhombic phase of Na_2LaOPO_4 (sodium lanthanum oxyphosphate), and novel Na_2NdOPO_4 (sodium neodymium oxyphosphate), Na_2SmOPO_4 (sodium samarium oxyphosphate) were synthesized by solid state reactions of Na_2CO_3, NH_4H_2PO_4, and Ln_2O_3 (Ln = La, Nd, and Sm). The unit cell dimensions were calculated using their X-ray powder diffraction data, which were a = 13.60(1), b = 12.71(1), and c = 6.96(1) Å, a = 13.466(5), b = 12.547(6), and c = 6.932(5) Å, and a = 13.54(1), b = 12.577(8), and c = 7.047(5) Å, respectively, and the probable space group was Pmm2. Using the same procedure orthorhombic Na_2DyOPO_4 (sodium dysprosium …
The Synthesis And Anticonvulsant Activity Of 1-Substituted-7-Methoxy-1,2,4-Triazolo [4,~3-A]Quinoline, Li-Ping Guan, Xian-Yu Sun, Guan-Rong Tian, Kyu-Yun Chai, Zhe-Shan Quan
The Synthesis And Anticonvulsant Activity Of 1-Substituted-7-Methoxy-1,2,4-Triazolo [4,~3-A]Quinoline, Li-Ping Guan, Xian-Yu Sun, Guan-Rong Tian, Kyu-Yun Chai, Zhe-Shan Quan
Turkish Journal of Chemistry
A new series of 1-substituted-7-methoxy-5-phenyl-1,2,4-triazolo [4,3-a]quinolines were synthesized using ethyl-3-oxo-3-phenylpropanoate and 4-methoxybenzenamine as the starting material. Their anticonvulsant activity was evaluated by the maximal electroshock (MES) test and 7-methoxy-5-phenyl-1,2,4-triazolo[4,3-a]quinoline (4a) was identified as the most potent compound, with an ED_{50} value of 9.2 mg kg^{-1}, which is comparable to the reference drug phenytoin (ED_{50} = 9.9 mg kg^{-1}). To explore the possible mechanism of its anticonvulsant activity, compound 4a was tested with the rotarod neurotoxicity test, pentylenetetrazole (sc-PTZ) test, and isoniazid test. Compound 4a had a higher protective index (PI = TD_{50}/ED_{50}) value (16.6) than phenytoin (PI = 7.0), and …
Synthesis And X-Ray Structural Studies Of Amino Acids Half Sandwich Complexes Of Osmium(Ii), Raja A. Sarfraz, Tasneem Gul Kazi, Shahid Iqbal, Hassan I. Afridi, Mohammad K. Jamali, Nusrat Jalbani, Mohammad Bilal Arain
Synthesis And X-Ray Structural Studies Of Amino Acids Half Sandwich Complexes Of Osmium(Ii), Raja A. Sarfraz, Tasneem Gul Kazi, Shahid Iqbal, Hassan I. Afridi, Mohammad K. Jamali, Nusrat Jalbani, Mohammad Bilal Arain
Turkish Journal of Chemistry
The amino acids complexes of osmium(II), i.e. [Os(\eta 6-p-cymene)(\eta1-N-(rac)-phenylglycine methyl ester)Cl_2] (A) and [Os(\eta 6-p-cymene) (\eta1-N,N'-(S)-phenylalanine amido) Cl] (B), were prepared by an ultrasound energy-assisted method at room temperature. The solid structures of the newly synthesized complexes were determined by single crystal X-ray analysis. In A, osmium is bonded to 2 chloride ligands, the \eta 6-coordinated p-cymene molecule, and to a nitrogen atom of the corresponding amino acid derived ligand, whereas in the case of B the central osmium is surrounded by an N, N' bidentate amino amide ligand, by an \eta 6-coordinated p-cymene molecule, and a chloride ligand. Both …
Diphenylthiocarbazone Immobilized On The Triacetyl Cellulose Membrane As An Optical Silver Sensor, Meissam Noroozifar, Mozhgan Khorasani-Motlagh, Aboozer Taheri, Rohhollah Zare-Dorabei
Diphenylthiocarbazone Immobilized On The Triacetyl Cellulose Membrane As An Optical Silver Sensor, Meissam Noroozifar, Mozhgan Khorasani-Motlagh, Aboozer Taheri, Rohhollah Zare-Dorabei
Turkish Journal of Chemistry
An optical sensor for the direct measurement of silver was developed. The basic element of this optode is the immobilization of diphenylthiocarbazone on a triacetyl cellulose membrane. This optode has a linear range of up to 40 \mu g mL^{-1} of Ag^+ ions, with a limit of detection of 0.01 \mu g mL^{-1}. The response time of the optode was 4-7 min, depending on the concentration of Ag^+ ions.
Compounds Isolated From Tannacetum Polycephalum, . Azizuddin, Muhammad Iqbal Choudhary
Compounds Isolated From Tannacetum Polycephalum, . Azizuddin, Muhammad Iqbal Choudhary
Turkish Journal of Chemistry
Several known secondary metabolites, namely lupeol (1), \beta-sitosterol (2), stigmasterol (3), and 2,6-dimethoxy-4-hydroxy acetophenone (4) were isolated from a folkloric medicinal plant, Tannacetum polycephalum. The structures of these compounds were elucidated on the basis of various spectroscopic methods.