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  • 1
    Electronic Resource
    Electronic Resource
    Isozyme-Specific Monoclonal Antibodies of CaM-Stimulated Phosphatase: Identification of an Enzyme Domain Involved in Metal Ion Activation
    Amsterdam : Elsevier
    Archives of Biochemistry and Biophysics 300 (1993), S. 615-621 
    Details
    ISSN: 0003-9861
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1006/abbi.1993.1085
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  • 2
    Electronic Resource
    Electronic Resource
    The reaction of lysozyme with 2-(bromoacetamido)-2-deoxy-d-glucose
    Amsterdam : Elsevier
    Carbohydrate Research 12 (1970), S. 133-134 
    Details
    ISSN: 0008-6215
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/S0008-6215(00)80233-5
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  • 3
    Electronic Resource
    Electronic Resource
    186. Pituitary function in Sheehan's syndrome
    Amsterdam : Elsevier
    Journal of Steroid Biochemistry 9 (1978), S. 852 
    Details
    ISSN: 0022-4731
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0022-4731(78)90886-5
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  • 4
    Electronic Resource
    Electronic Resource
    Anodic oxidation of N-anions. III. Anodic oxidation of the N-anions of diacylimides: A search for a new electrochemical synthesis of hydrazine (1980)
    Springer
    Journal of applied electrochemistry 10 (1980), S. 97-107 
    Details
    ISSN: 1572-8838
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Electrical Engineering, Measurement and Control Technology
    Notes: Abstract The anodic oxidation of N-anions of diacylimides which are acidic enough to be deprotonated by relatively weak bases in protic solvents was investigated with respect to the electrode kinetics and preparative aspects. All imide anions are oxidized in a one-electron step to the respective imide radicals. Of the imides investigated, two were cyclic carboxylic imides (succinimide and phthalimide) three were sulphonyl imides (di-p-toluene and di-benzene sulphimide, dimethane sulphimide) and one was a mixed carboxylate-sulphonate imide (saccharate). The imide radicals produced by anodic oxidation of the dicarboxylate imides do not couple to form a hydrazine derivative but induce solvent oxidation by H-abstraction. The disulphonyl imides couple to unstable hydrazine derivatives although H-abstraction occurs to more than 80%. Only the anodic coupling of the N-anion of imido-disulphonic acid to hydrazine tetrasulphonate discovered by Grinstead [3] can be performed with good selectivity and current and mass yields. The optimum conditions for this reaction are determined in order to show that it may serve in the future as one step in a new hydrazine process.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00937344
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  • 5
    Electronic Resource
    Electronic Resource
    Spectrophotometric studies and analytical application of Ce(III) chelates with 1-(2-pyridylazo)-2-naphthol (PAN) (1984)
    Springer
    Monatshefte für Chemie 115 (1984), S. 57-64 
    Details
    ISSN: 1434-4475
    Keywords: Cerium determination ; Spectrophotometry
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Es wurde eine empfindliche Methode zur spektrophotometrischen Bestimmung von Cer(III) entwickelt. Bei einempH von 10,2 reagiert Cer mit 1-(2-Pyridylazo)-2-naphthol in 40% Ethanol unter Bildung eines roten Komplexes mit einem Absorptionsmaximum bei 545 nm (ε=3 950). Der Komplex besitzt in reinem Ethanol ein Maximum an Stabilität. Die Stöchiometrien und Strukturen der gebildeten 1:1- und 1:2-Chelate wurden mittels konduktometrischer Titration, Elektronen- und IR-Spektrometrie untersucht. Die IR-Daten zeigen, daß die Koordination über N=N, C-OH und Pyridyl erfolgt.
    Notes: Abstract A sensitive procedure for spectrophotometric determination of cerium(III) has been developed. AtpH 10.2 cerium reacts with 1-(2-pyridylazo)-2-naphthol in 40% ethanol to form a red complex which has an absorption maximum at 545 nm. The molar absorptivity at 545 is 3.95·103 mol−1. Maximum stability of the complex was attained in pure ethanol. The stoichiometries and structures of the chelates were studied applying conductometric titration, visible spectrophotometry and IR spectrophotometry. The IR spectra revealed that coordination takes place through the N=N, C-OH and pyridyl group.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00798421
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  • 6
    Electronic Resource
    Electronic Resource
    Polarographic behaviour of 2,2′-dipyridyl-2-pyridylhydrazone (DPPH) and pyridine-2-aldehyde-2-quinolylhydrazone (PAQH) at the dropping mercury electrode (1987)
    Springer
    Monatshefte für Chemie 118 (1987), S. 1335-1343 
    Details
    ISSN: 1434-4475
    Keywords: Electrochemistry ; Reduction mechanism ; Kinetic parameters
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Das polarographische Verhalten der TitelverbindungenDPPH undPAQH wurde in wäßrigenBritton-Robinson-Puffern mit 50% Ethanolgehalt an der tropfenden Quecksilberlelektrode untersucht. Die Polarogramme zeigen eine irreversible Welle im basischen und alkalischen Medium. Zwei Elektronen werden bei der Spaltung der N-N-Bindung verbraucht. DerpH-Effekt auf den Grenzstrom undE 1/2 und auch auf den Reduktionsmechanismus wird diskutiert und mit ähnlichen Verbindungen verglichen. Die kinetischen Parameter für die Elektrodenreaktion werden für verschiedenepH-Werte aus den polarographischen Daten berechnet.
    Notes: Abstract The polarographic behaviour of 2,2′-dipyridyl-2-pyridylhydrazone (DPPH) and pyridine-2-aldehyde-2-quinolylhydrazone (PAQH) atdme were studied in aqueousBritton-Robinson buffers containing 50% ethanol. The polarograms consist of one irreversible wave in the acidic and alkaline medium. Two electrons are consumed in the splitting of the N-N bond. The effect ofpH on the limiting current andE as well as the reduction mechanism are discussed and compared with similar compounds. The values of the kinetic parameters for the electrode reaction at differentpH values are also computed from the polarographic results.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00810638
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  • 7
    Electronic Resource
    Electronic Resource
    Kinetic studies of the hydrolysis of furfurylidene benzoylhydrazone (1989)
    Springer
    Monatshefte für Chemie 120 (1989), S. 323-328 
    Details
    ISSN: 1434-4475
    Keywords: Kinetic studies ; Hydrolysis ; Furfuryl benzoylhydrazone
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Es wurde festgestellt, daß die Hydrolyse von Furfurylidenbenzoylhydrazon (FBH) in HCl-Medium einer speziellen Säurekatalyse gehorcht, wohingegen die Hydrolyse in universellen Puffer-Medien nach einer generellen Säure-Base Katalyse abläuft. Es werden Mechanismen für die verschiedenen sauren Medien postuliert. Die beobachteten Geschwindigkeitskonstanten, die sekundären Geschwindigkeitskonstanten, Aktivierungs- und sonstige thermodynamische Parameter für die Hydrolyse von Furfurylidenbenzoylhydrazon werden berichtet. Der Effekt wechselnder Ethanolkonzentration auf die Hydrolysengeschwindigkeitskonstante in Ethanol-Puffer-Mischungen wird diskutiert.
    Notes: Summary The hydrolysis of furfurylidene benzoylhydrazone,FBH, in hydrochloric acid medium has been found to follow specific acid catalysis, whereas the hydrolysis in universal buffer medium has been found to follow general acid-base catalysis. Mechanisms for the hydrolysis in different acidic media have been postulated. The observed rate constants, secondary rate constants, activation and thermodynamic parameters for the hydrolysis of furfurylidene benzoylhydrazone have been reported. The effect of change in percentage of ethanol in the ethanol-buffer mixture on the rate of hydrolysis has been discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00811745
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  • 8
    Electronic Resource
    Electronic Resource
    Polarographic behaviour of 1,3-bis[(2-pyridyl)methyleneamino]thiourea (PMAT) in absence and presence of Triton X-100 (1987)
    Springer
    Monatshefte für Chemie 118 (1987), S. 749-757 
    Details
    ISSN: 1434-4475
    Keywords: Polarographic behaviour ; Triton X-100 ; 1,3-Bis[(2-pyridyl)methyleneamino]thiourea (PMAT)]
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Es wurde das polarographische Verhalten vonPMAT in Lösungen mit verschiedenempH sowohl in Gegenwart als auch ohne Triton X-100 (T.X-100) untersucht. Es wird ein Mechanismus für den Reduktionsprozeß diskutiert. Der Adsorptionseffekt des elektrochemisch inaktiven T.X-100 wurde hinsichtlich der polarographischen Wellen vonPMAT untersucht. Die kinetischen Parameter der Elektrodenreaktion wurden für verschiedenepH-Werte ermittelt. Ebenso wird die Anwendbarkeit der polarographischen Methode für die Bestimmung vonPMAT diskutiert.
    Notes: Abstract The polarographic behaviour of 1,3-bis[(2-pyridyl)methyleneamino]thiourea (PMAT) in solutions of varyingpH has been studied both in the absence and presence of Triton X-100 (T.X-100). The mechanism for the reduction process is discussed. The adsorption effect of electrochemically inactive T.X-100 on the polarographic waves ofPMAT has been investigated. The values of the kinetic parameters for the electrode reaction at differentpH values have been computed. The applicability of the polarographic method for determination ofPMAT is also discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00809225
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  • 9
    Electronic Resource
    Electronic Resource
    Methylmercuric chloride and serum cholesterol level in the bluegill (Lepomis macrochirus) (1986)
    Springer
    Bulletin of environmental contamination and toxicology 36 (1986), S. 181-185 
    Details
    ISSN: 1432-0800
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01623492
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  • 10
    Electronic Resource
    Electronic Resource
    Voltammetric and Spectrophotometric Determination of Nizatidi ne in Pharmaceutical Formulations (2000)
    Springer
    Microchimica acta 134 (2000), S. 153-160 
    Details
    ISSN: 1436-5073
    Keywords: Key words: Voltammetry; spectrophotometry; nizatidine determination.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract.  Two methods are described for quantitative determination of nizatidine. The first is a cathodic stripping voltammetric method which is based on the accumulation of the compound at the hanging mercury drop electrode. The adsorptive stripping response was evaluated with respect of accumulation time, potential, concentration, pH and other variables. A linear calibration graph was obtained over the range 3.0×10−8–1.0×10−6 M with a detection limit 3.0×10−8 M after a 20s accumulation time at −0.2 V accumulation potential. On the other hand, it was found that the detection limit could be lowered to 1.0×10−8 M after 180s accumulation time at −0.2 V accumulation potential. The relative standard deviation was in the range 1.2−2.0% for six measurements. The tolerance amounts of the common excipients have also been reported. The second is a spectrophotometric method which is based on the formation and extraction of the ion-pair complex formed between nizatidine and either bromocresol green or bromothymol blue. The extracted colored ion-pair complexes absorb at 416 nm. The effect of different factors such as: type of organic solvent, pH, reagent concentration, number of extraction times, shaking time, temperature and the tolerance amount of the common excipients have been reported. The calibration graph was linear in the range 6.0×10−7–1.8×10−5 M with a detection limit of 6.0×10−7 M and molar absorptivity of 2.1×104 lċmol−1ċcm−1 when using bromocresol green, while the calibration graph was linear in the range 3.0×10−7–1.1×10−5 M with a detection limit of 3.0×10−7 M and molar absorptivity of 3.2×104 lċmol−1ċcm−1 when using bromothymol blue. The spectrophotometric methods offer alternative methods with reasonable sensitivity, selectivity and accuracy with relative standard deviation in the range 2.1−6.0% and 1.2−4.7% (for six measurements) when using bromothymol blue and bromocresol green, respectively. The proposed two methods were applied for the determination of nizatidine in commercially available dosage forms. A comparison between the voltammetric and the extraction-spectrophotometric methods was also reported.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s006040070031
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