Güncel Gönderiler: Kimya Bölümü
Toplam kayıt 724, listelenen: 481-500
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Determination of kinetic properties of polyphenol oxidase from Thymus (Thymus longicaulis subsp chaubardii var. chaubardii)
(Elsevier Science Sa, 2004)A partial characterization of polyphenol oxidase (PPO) activity of Thymus longicaulis subsp. chaubardii var. chaubardii is described. Polyphenol oxidase of Thymus was isolated by (NH4)(2)SO4 precipitation and dialysis. The ... -
Solvents effect on infrared spectra of trimethyl phosphate in organic solvents
(Elsevier Science Bv, 2004)Infrared spectroscopy studies of trimethyl phosphate (TMP) in 17 different pure organic solvents were undertaken to investigate the solvent-solute interactions and to correlate solvent properties such as the Kirkwood-Bauer-Magat ... -
Thermal decomposition kinetics of some metal complexes of N,N-diethyl-n '-benzoylthiourea
(Kluwer Academic Publ, 2000)Thermogravimetry (TG) and differential thermal analysis (DTA) were performed on the complexes with general formula (M(DEBT)(n) (where M=Fe, Co, Ni, Cu or Ru; n=2, or 3 and DEBT=N,N-diethyl-N'-benzoylthiourea). Derivative ... -
The synthesis of novel crown ethers, part VII [1]. Coumarin derivatives of benzocrowns and cation binding from fluorescence spectra
(Springer, 2000)4-[3-(1-benzopyran-2-one)] derivatives of benzo[12]crown-4, benzo[15]crown-5 and benzo-[18]crown-6 were synthesized from 4-[3-(1-benzopyran-2-one)]-1,2-dihydroxy-benzene reacting with bis-ethyleneglycol dihalides or ... -
Supercritical fluid extraction of Euphorbia rigida
(Wiley-V C H Verlag Gmbh, 2000)The steadily increasing consumption of crude oil and apparent insecurity in the supply and price of foreign petroleum during the late 1970’s have boosted research on the substitution of traditional hydrocarbon fuels by ... -
Adsorption of methylene blue from aqueous solution onto perlite
(Kluwer Academic Publ, 2000)Adsorption of methylene blue from aqueous solutions onto unexpanded and expanded perlite samples activated by H2SO4 and NaCl solutions has been investigated, to assess the possibility of using perlite for removing cationic ... -
Dissolution kinetics of ulexite in aqueous EDTA solutions
(Metallurgical Soc-C I M, 2000)The dissolution kinetics of ulexite in aqueous disodium Ethylene Diamine Tetra Acidic Acid (EDTA) solutions has been investigated with respect to the effects of particle size, solution concentration, pH of solution, ... -
Extraction of some transition metals with N,N-dibutyl-N '-benzoylthiourea into molten paraffin at 65 degrees C
(Elsevier Science Bv, 2000)The solid-liquid extraction behaviour of some transition metals (Cu(II), Co(II), Ni(II), Cd(II) and Pb(II)) by the use of N,N-dibutyl-N'-benzoylthiourea as an extractant in paraffin (58-60 degrees C) has been investigated ... -
Determination of acidity constants of acid-base indicators by second-derivative spectrophotometry
(Pergamon-Elsevier Science Ltd, 2000)A method for calculation of acid-base dissociation constants of monoprotic weak organic acids whose acid and base species have overlapping spectra from absorptiometric and pH measurements is described. It has been shown ... -
The synthesis of novel macrocycles, Part V. The coumarin crown ethers and cation binding with fluorescence spectra
(Gordon Breach Scı Publ Ltd, 1999)The 4-H, 4-methyl and g-phenyl derivatives of benzo-alpha-pyrone of 12-crown-4 and 15-crown-5 were synthesised starting from 4-substituted-6,7-dihydroxy- and 7,8-dihydroxybenzo-alpha-pyrones which reacted with dichloropolyethylene ... -
Estimation of Li+, K+ and Ca2+ complexation with [12]crown-4, [15] crown-5 and [18]crown-6 using a Na+ISE in dioxane-water, part IV - Cation equilibrium constants of macrocyclic ethers with ion selective electrodes
(Springer-Verlag Wien, 1999)The (1:1) Na+ equilibrium constants, K-e1, of macrocyclic ethers of [12]crown-4, [12]crown-5 and [18]crown-6 were determined with a Na+ ISE in the presence of a second cation e.g. Li+, K+ and Ca2+ in dioxane/water (50/50). ... -
The association constant of macrocyclic ether-cation interactions in 1,4-dioxane/water mixtures. III - Effect of temperature on the binding
(Wiley-V C H Verlag Gmbh, 1999)The association constant, K-a, of Na+ with [12] crown-4, [15]crown-5 and [18]crown-6 crown ethers were determined in a binary mixture, 1,4-dioxane/water (50/50) using a Na+ ion selective electrode at different temperatures. ... -
Computational and experimental study on 7-epicandicandiolisolated from sideritis niveotomentosa huber - morathii
(Univ Babes-Bolyai, 2014)7-epicandicandiol is an ent-kaurane diterpenoid isolated from Sideritis niveotomentosa Huber - Morathii. The molecular geometry, vibrational frequencies, and gauge including atomic orbital (GIAO) H-1- and C-13-NMR chemical ... -
Solvent effect upon ion-pair extraction of different sodium dyes using some crown ethers
(Springer, 1999)Liquid-liquid extractive-spectrophotometric studies of sodium ion complexes of 18-crown-6(18C6), dibenzo-18-crown-6(DB18C6), 15-crown-5(15C5), and 12-crown-4(12C4) and anionic dyes [4 (2 pyridylazo)-resorcinol monosodium ... -
Synthesis, characterization and tyrosinase inhibitory properties of benzimidazole derivatives
(Maik Nauka/İnterperiodica/Springer, 2014)1-Alkylbenzimidazole and 1,3-dialkyl benzimidazolium salts were synthesized and characterized by the data of IR, H-1 NMR, C-13 NMR spectra and elemental analyses. These compounds were investigated as tyrosinase inhibitors. ... -
Determination and chemometric evaluation of total aflatoxin, aflatoxin B1, ochratoxin a and heavy metals content in corn flours from Turkey
(Elsevier Sci Ltd, 2014)Concentrations of the total aflatoxin, aflatoxin B1, aflatoxin B2, aflatoxin G1, aflatoxin G2, ochratoxin A, lead, cadmium, mercury, arsenic, copper, zinc and chromium in corn flour samples were determined. Eighteen corn ... -
A new affinity method for purification of bovine testicular hyaluronidase enzyme and an investigation of the effects of some compounds on this enzyme
(Wiley-Blackwell, 2015)In this study, a new affinity gel for the purification of bovine tes-ticular hyaluronidase (BTH) was synthesized. L-Tyrosine wasadded as the extension arm to the Sepharose-4B activated withcyanogen bromide. m-Anisidine is ... -
Characterization and biocompatibility of synthesized PCL/nHAp bio nanocomposites
(Wiley-Blackwell, 2014) -
Reductive cleavage of carbon monoxide by a disilenide
(Wiley-v c h verlag gmbh, 2015)The complete reductive cleavage of the triple bond in carbon monoxide was achieved using a lithium disilenide at room temperature. The CC-coupled product can be regarded as a silanone dimer with pending alkyne and silirene ... -
Synthesis and application of a new functionalized resin for use in an on-line, solid phase extraction system for the determination of trace elements in waters and reference cereal materials by flame atomic absorption spectrometry
(Elsevier Sci LTD, 2013)The synthesis and characterization of the resin Amberlite XAD-4 functionalized with 2,6-pyridinedicarboxaldehyde and its application in an on-line system for the preconcentration of cadmium, cobalt, copper, lead and manganese ...
