Skip to main content

31 Result(s)

within Chemistry Remove this filter Pharmacy Remove this filter Z.P. ** Remove this filter

previous disabled Page of 2
and

  1. No Access

    Article

    Support and dispersion effects on activity of platinum catalysts during wet oxidation of organic wastes

    Catalytic activity of platinum catalysts such as Pt/graphite, Pt/TiO2, Pt/Al2O3, and Pt/active carbon was studied using a slurry phase CSTR. Three model reactions, namely, phenol, maleic acid, and malonic acid ox...

    Z. P. G. Masende, B. F. M. Kuster, K. J. Ptasinski… in Topics in Catalysis (2005)

  2. No Access

    Article

    Separation and purification ofBacillus thuringiensis(Bt) toxic protein CrylAb from transgenic rice by ion-exchange chromatography

    A separation method for Bt toxic protein CrylAb from Bt transgenic rice (Ke Ming Dao) by ion-exchange chromatography has been developed and validated. Bt transgenic rice-extract containing CrylAb toxic protein is...

    Z. P. Wu, B. J. Xu, Z. Y. Chen in Chromatographia (2001)

  3. No Access

    Article

    HPLC determination of copper(II), cobalt(II) and iron(II) in pharmaceutical preparations using 2-acetylpyridine-4-phenyl-3-thiosemicarbazone derivatizing agent

    Cu(II) Co(II) and Fe(II) in pharmaceutical preparations were determined using precolumn derivatization and solvent extraction with 2-acetylpyridine-4-phenyl-3-thiosemicarbazone (APPT) as complexing reagent. Li...

    M. Y. Khuhawar, Z. P. Memon, S. N. Lanjwani in Chromatographia (1995)

  4. No Access

    Article

    HPLC determination of copper(II), cobalt(II) and iron(II) in pharmaceutical preparations using 2-acetylpyridine-4-phenyl-3-thiosemicarbazone derivatizing agent

    Cu(II) Co(II) and Fe(II) in pharmaceutical preparations were determined using precolumn derivatization and solvent extraction with 2-acetylpyridine-4-phenyl-3-thiosemicarbazone (APPT) as complexing reagent. Li...

    M. Y. Khuhawar, Z. P. Memon, S. N. Lanjwani in Chromatographia (1995)

  5. No Access

    Article

    Heteroorganic derivatives of furan. 65. Effect of substituents on shielding of 1H, 13C, and 29Si and 29Si-13C spin-spin coupling constants in NMR spectra of 2-substituted furans and 5-trimethylsilylfurans

    The results of an investigation of 2-substituted furans and 5-trimethylsilylfurans by NMR spectroscopy and the CNDO/2 method showed that the chemical shifts of the different nuclei do not correlate sufficientl...

    Yu. Yu. Popelis, É. É. Liepin'sh, Z. P. Bruveris… in Chemistry of Heterocyclic Compounds (1990)

  6. No Access

    Article

    The use of p-n-butyl oxybenzoic acid as liquid-crystalline sorbent in gas chromatography

    The retention mechanisms of polymethylbenzenes and n-alkylbenzenes on the inert solid support Chromaton (spec-surface area: 1m2/g) and the adsorbent-support Silochrom (C-80 (80 m2/g) coated with p-n-butyl oxybenz...

    Z. P. Vetrova, N. T. Karabanov, T. N. Shuvalova, L. A. Ivanova… in Chromatographia (1985)

  7. No Access

    Article

    Tetrazoles. 15. Electrical conductivity of 5-phenyltetrazole and its salts in water and organic solvents

    The electrical conductivity of 5-phenyltetrazole and its potassium, cesium, and ammonium salts in water, acetone, acetonitrile, nitromethane, and dimethyl sul-foxide has been studied. 5-Phenyltetrazole and its...

    V. M. Tsentovskii, V. E. Bashkirtseva… in Chemistry of Heterocyclic Compounds (1983)

  8. No Access

    Article

    Radical meso-alkylation of vanadyletioporphyrin

    The possibility of the meso-alkylation of vanadyletioporphyrin (25–30% yields) by its reaction with alkyl bromides [C(6)-C(12)] in the presence of finely dispersed silver metal at 150–180 °C in an argon atmospher...

    Z. P. Altukhova, V. R. Antipenkov, V. I. Titov in Chemistry of Heterocyclic Compounds (1983)

  9. No Access

    Article

    13C NMR spectra of 5-substituted 8-mercaptoquinolines

    The increments of the substituents were determined from the 13C NMR spectra of 5-substituted quinolines. It is shown that the increments correlate with those in benzenes, as well as with the Swain-Lupton constant...

    I. V. Zuika, Yu. Yu. Popelis, Z. P. Bruvers… in Chemistry of Heterocyclic Compounds (1981)

  10. No Access

    Article

    Calculation of the electronic spectrum within the CNDO/S (complete neglect of differential overlap/S) approximation and character of the long-wave absorption band of 2-N-pyridinia-1,3-indandione betaine

    The electronic spectrum of 2-N-pyridinia-1,3-indandione betaine was calculated by the MO LCAO method within the CNDO/S approximation with the Del Bene-Jaffe parametrization in order to refine the concepts rega...

    V. É. Kampar, Z. P. Bruvers, O. Ya. Neiland in Chemistry of Heterocyclic Compounds (1981)

  11. No Access

    Article

    Mo self-consistent-field (scf) calculations of quinoline and its derivatives. 4. Theoretical examination of the formation of the mesoionic form of 8-mercaptoquinoline and its derivatives

    The formation of the mesoionic form of 8-mercaptoquinoline and its derivatives in a polar medium was examined within the CNDO/2 approximation. The change in the tautomerization constants of these compounds is ...

    Z. P. Bruvers, I. V. Zuika in Chemistry of Heterocyclic Compounds (1980)

  12. No Access

    Article

    13C NMR spectra of 7-substituted 8-mercaptoquinolines

    The13C NMR spectra of 7-substituted [7-CH3, 2,7-(CH3)2, 7-Cl, 7-Br, and 7-SCH3] 8-mercaptoquinolines and 8-methylmercaptoquinolines were examined. It is shown that the changes in the13C chemical shifts of the qui...

    I. V. Zuika, Yu. Yu. Popelis, Z. P. Bruvers… in Chemistry of Heterocyclic Compounds (1980)

  13. No Access

    Article

    13C NMR spectra of 7-substituted 8-mercaptoquinolines

    The13C NMR spectra of 7-substituted [7-CH3, 2,7-(CH3)2, 7-Cl, 7-Br, and 7-SCH3] 8-mercaptoquinolines and 8-methylmercaptoquinolines were examined. It is shown that the changes in the13C chemical shifts of the qui...

    I. V. Zuika, Yu. Yu. Popelis, Z. P. Bruvers… in Chemistry of Heterocyclic Compounds (1980)

  14. No Access

    Article

    13C NMR spectra of protonated S-methylquinolines

    The signals in the13C NMR spectra of protonated 2-, 3-, 4-, 5-, 6-, and 8-S-methylquinolines in solution in 6 N DCl were assigned. The changes in the13C chemical shifts relative to the neutral molecules were comp...

    I. V. Zuika, Z. P. Bruvers, M. A. Tsirule in Chemistry of Heterocyclic Compounds (1980)

  15. No Access

    Article

    13C NMR spectra of 8-mercaptoquinoline and 8-hydroxyquinoline

    The signals in the13C NMR spectra of quinoline and its 8-substituted derivatives (SH, SCH3, OH, OCH3, NH2, I, and CH3), 8,8′-diquinolyl disulfide, the 8-hydroxy-N-methylquinolinium ion, and the protonated and ani...

    Yu. Yu. Popelis, I. V. Zuika, Z. P. Bruvers… in Chemistry of Heterocyclic Compounds (1980)

  16. No Access

    Article

    Mo self-consistent-field (scf) calculations of quinoline and its derivatives. 3. Protonation energies and basic properties

    The basic properties (pKNH+) of quinoline and its amino-, methoxy-, and S-methyl-substituted derivatives (substitution in the 2–8 positions of the quinoline ring) are compared with the bond energy [E(NhetH)], the...

    Z. P. Bruvers, I. V. Zuika in Chemistry of Heterocyclic Compounds (1980)

  17. No Access

    Article

    Mo self-consistent-field (scf) calculations of quinoline and its derivatives. 3. Protonation energies and basic properties

    The basic properties (pKNH+) of quinoline and its amino-, methoxy-, and S-methyl-substituted derivatives (substitution in the 2–8 positions of the quinoline ring) are compared with the bond energy [E(NhetH)], the...

    Z. P. Bruvers, I. V. Zuika in Chemistry of Heterocyclic Compounds (1980)

  18. No Access

    Article

    13C NMR spectra of S-methylquinolines

    The 13C chemical shifts and the increments (Δδ) of the SCH3 group in the NMR spectra of S-methylquinolines were measured. It is shown that the chemical shifts of S-methylquinolines correlate satisfactorily with t...

    I. V. Zuika, Yu. Yu. Popelis, I. P. Sekatsis… in Chemistry of Heterocyclic Compounds (1979)

  19. No Access

    Article

    Molecular-orbital self-consistent field calculations of quinoline and its derivatives

    The electronic spectra of the thiol, anionic, protonated, and mesoionic forms of 8-mercaptoquinoline and the mesoionic form of 5-mercaptoquinoline and the 5-mercapto-N-methylquinolinium ion were calculated wit...

    Z. P. Bruvers, L. V. Zuika in Chemistry of Heterocyclic Compounds (1978)

  20. No Access

    Article

    Research on polymerocyanines

    A number of dimethylidynenullomethylidynedimerocyanines that are derivatives of 1-methyl-2-thioketo-3-ethylimidazolidin-4-one, 2-thioketo-3-n-butyloxazolidin-4-one, and 1-phenyl-3-methylpyrazol-5-one were synt...

    M. S. Lyubich, Z. P. Sytnik, N. V. Kudryavskaya in Chemistry of Heterocyclic Compounds (1977)

previous disabled Page of 2