Güncel Gönderiler: Kimya-Makale Koleksiyonu
Toplam kayıt 678, listelenen: 421-440
-
Electrokinetic properties of kaolinite in mono- and multivalent electrolyte solutions
(Elsevier Science Bv,, 2005)Zeta potential, known as the electrical potential at the shear plane, zeta, is one of the important electrokinetic properties of clay minerals. For many applications, the sign and the magnitude of the ( potential is necessary ... -
The synthesis, characterization and conductance studies of new Cu(II), Ni(II) and Zn(II) complexes with the Schiff base derived from 1,2-bis-(o-aminophenoxy)ethane and salicylaldehyde
(Taylor & Francis Inc, 2003)Cu(II), Ni(II) and Zn(II) complexes with the Schiff base derived from 1,2-bis-(omicron-aminophenoxy)ethane with salicylaidehyde have been prepared. The complexes have been characterized by elemental analysis, magnetic ... -
X-ray analsysis of sideroxol from Sideritis leptoclada
(Springer, 2005)Sideroxol (1), a kaurane diterpene which has the ent-7 alpha,18-dihydroxy-15 beta,16 beta-epoxykaurane structure (MW = 320.47, C20H32O3) was obtained from the acetone extract of Sideritis leptoclada plant as well as from ... -
Carbonic anhydrase inhibitors. Inhibition of red blood cell ostrich (Struthio camelus) carbonic anhydrase with a series of aromatic and heterocyclic sulfonamides
(Taylor & Francis Ltd, 2005)The purification of red blood cell carbonic anhydrase (CA, EC 4.2. 1. 1) from ostrich (scCA) blood is reported, as well as an inhibition study of this enzyme with a series of aromatic and heterocylic sulfonamides. The ... -
Poly(methyl methacrylate) monolayers at the air-water interface
(Elsevier Science Bv, 2005)Several poly(methyl methacrylate) (PMMA) molecules with various chain numbers has been synthesised using Emulsifier-free emulsion polymerisation method. Langmuir-Blodgett thin film technique is an excellent method to ... -
Spun thin films of poly(methyl methacrylate) polymer for benzene sensing
(Iop Publishing Ltd, 2005)Thin films of poly(methyl methacrylate) (PMMA) were deposited on suitably prepared substrates by spinning the spreading solution in chloroform at 3000 rpm for atomic force microscopy and surface plasmon resonance studies. ... -
Synthesis and structure of cyclopropano-annelated homosesquinorbornene derivatives containing pyramidalized double bonds: Evidence for the sterical effect of a cyclopropyl. group on the degree of C=C double-bond pyramidalization
(Amer Chemical Soc,, 2005)endo- and exo-2,3,4,7-tetrahydro-1H-1,4-methanobenzoeyeloheptene-7-carboxylic acid ethyl esters have been synthesized, and their Diels-Alder cycloaddition reactions with maleic anhydride, dimethyl acetylenedicarboxylate ... -
Characterization of a novel 1,3-bis(p-iminobenzoic acid)indane Langmuir-Blodgett film for organic vapor sensing
(Amer Scientific Publishers, 2005)In the present paper we report about the Langmuir-Blodgett thin film characterization and organic vapor sensing properties of a novel 1,3-bis(p-iminobenzoic acid)indane (IBI) containing polar carboxylic acid groups. LB ... -
Inhibition of polyphenol oxidase obtained from various sources by 2,3-diaminopropionic acid
(Wiley, 2005)This paper reports for the first time the inhibition of the catecholase activities of mushroom, artichoke (Cynara scolymus L) and Ocimum basilicum L polyphenol oxidase by 2,3-diaminopropionic acid. Polyphenol oxidases from ... -
The synthesis and complexation study of some coumestan and coumestan analog derivatives of crown ethers using conductometry
(Elsevier Sci Ltd,, 2005)8,9-Dihydroxycoumestans, the 8,9-dihydroxy-6H-benzofuro[3,2-c][1]-benzopyran-6-one, derivatives were prepared from corresponding 4-hydroxy-2H-[1]benzopyran-2-one and catechol in oxidizing mixture KIO3/CH3COONa/H2O/acetone ... -
Removal of reactive blue 221 and acid blue 62 anionic dyes from aqueous solutions by sepiolite
(Elsevier Sci Ltd, 2005)The removal of reactive blue 221 and acid blue 62 anionic dyes onto sepiolite from aqueous solutions has been investigated using parameters such as calcination temperature, pH, ionic strength and temperature. After 200degreesC ... -
Polyphenol oxidase activity of oregano at different stages
(Elsevier Sci Ltd, 2005)The effects of pH and temperature on polyphenol oxidase (PPO) activity of organs such as root, stem and leaf, of Origanum vulgare ssp. hirtum, collected at different stages (vegetative and generative) and from various ... -
Zeta potentials of perlite samples in various electrolyte and surfactant media
(Elsevier Science Bv, 2005)Electrokinetic properties of unexpanded and expanded perlite samples in suspensions of various electrolytes and surfactants were studied as a function of ionic strength, pH and, type and concentration of electrolyte and ... -
Fatty acid compositions of seed oils of three Turkish salvia species and biological activities
(Kluwer Academic/Plenum Publishers, 2005)The fatty acid composition of seed extracts of Salvia bracteata, S. aethiopis, and S. candidissima ssp. candidissima were analyzed by GC/MS. The main compound of S. bracteata, S. aethiopis, and S. candidissima ssp. candissima. ... -
A simple microwave-assisted route to prepare black cobalt, Co3O4
(Maik Nauka/Interperiodica/Springer, 2005)In this communication, we report a novel microwave-assisted decomposition reaction of cobalt nitrate hexahydrate, Co(NO3)(2) center dot 6H(2)O. Using microwave processing (10 min, 2.45 GHz), phase-pure tricobalt tetroxide ... -
Spectrophotometric determination of tartrazine, riboflavine and carmoisine in drinks by zero-order spectrophotometric method using determinant calculation and first derivative spectrophotometric method
(Mrs Pushpa Agarwal, 2005)Two very simple spectrophotometric methods are described for resolving binary and ternary mixtures of the food colorants tartrazine, carmoisine and riboflavine using the absorption and the first derivative spectra. Calibration ... -
Solid-phase extraction and spectrophotometric determination of trace amounts of mercury in natural samples
(Springer Wien, 2005)A sensitive and selective solid phase spectrophotometric method for the determination of trace amounts of inorganic mercury is described. Hg2+ was sorbed on a silica gel-packed column as an Hg2+-N,N'- bis(2-mercaptopheny ... -
Solubility of chlorine in aqueous hydrochloric acid solutions
(Elsevier Science Bv, 2005)The solubility of chlorine in aqueous hydrochloric acid solutions was studied. The effects of HCl concentration and temperature on the solubility were evaluated, and the thermodynamic parameters of the dissolution were ... -
Characterization and purification of polyphenol oxidase from artichoke (Cynara scolymus L.)
(Amer Chemical Soc,, 2005)In this study, the polyphenol oxidase (PPO) of artichoke (Cynara scolymus L.) was first purified by a combination of (NH4)(2)SO4 precipitation, dialysis, and a Sepharose 4B-L-tyrosine-p-aminobenzoic acid affinity column. ... -
Low and high temperature bromination of exocyclic dienes: high temperature bromination. Part 16
(Pergamon-Elsevier Science Ltd, 2003)The electrophilic addition of bromine to an exocyclic diene, 5,6-dimethylenebicyclo[2.2.1]hept-2-ene, in CCl4 at 0degreesC led to the formation of non-rearranged (73%) and rearranged products (27%). However, high temperature ...
