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  • Chemistry  (10)
  • Column liquid chromatography  (2)
  • Fluorescence  (2)
  • LASERS AND MASERS  (2)
  • 1
    Electronic Resource
    Electronic Resource
    Solvent relaxation in lipid bilayers with dansyl probes
    Amsterdam : Elsevier
    Biochimica et Biophysica Acta (BBA)/Biomembranes 815 (1985), S. 351-360 
    Details
    ISSN: 0005-2736
    Keywords: Dansyl probe ; Fluorescence ; Lipid bilayer ; Solvent relaxation
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology , Medicine , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0005-2736(85)90361-X
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  • 2
    Electronic Resource
    Electronic Resource
    The time resolved fluorescence and anisotropy of subtilisins BPN' and Carlsberg
    Amsterdam : Elsevier
    Biophysical Chemistry 41 (1991), S. 277-287 
    Details
    ISSN: 0301-4622
    Keywords: Anisotropy ; Fluorescence ; Lifetime ; Photon-counting ; Subtilisin
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0301-4622(91)85042-O
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  • 3
    Electronic Resource
    Electronic Resource
    Electro- and photo-initiated polymerization of N,N′-(4,4′-sulfonyldiphenylene)dimaleimide (1976)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 177 (1976), S. 3049-3058 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Bei der elektro- oder fotochemisch initiierten Polymerisation von N,N′-(4,4′-sulfonyldiphenylen)dimaleinsäureimid (4) in Gegenwart von Zinkdibromid und Toluol nehmen die Umsätze linear mit der Bestrahlungs- oder Stromeinwirkungszeit zu. Der Reaktionsmechanismus scheint in einer 2π+2π-Cycloaddition zu bestehen, welcher zu einer Elektro- oder Photo-Kondensation von 4 führt.
    Notes: A study has been made of the electro- and photo-initiated polymerization of N,N′-(4,4′-sulfonyldiphenylene)dimaleimide (4) in the presence of zinc dibromide and toluene. Product yields were linearly dependent on the photo irradiation or current passage times. The reaction mechanism appears to be a 2π+2π cycloaddition resulting in the electro or photo condensation of 4.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1976.021771019
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  • 4
    Electronic Resource
    Electronic Resource
    Acoustic relaxation and infrared spectroscopic measurements of the plasticization of poly(methyl methacrylate) by water (1977)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 21 (1977), S. 319-330 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Measurements are reported on the acoustic attenuation and velocity of dry and wet samples of poly(methyl methacrylate) over a temperature range of 5° to 70°C and over a frequency range of 5 to 35 MHz. Lowering of the glass transition temperature with increase in water content was reflected in an increase in the acoustic attenuation and a lowering of the velocity at high temperature. Comparison of the infrared spectra of wet and dry thin films indicates that water exhibits spectroscopic characteristics of isolated rather than highly clustered molecules. A study of the temperature dependence of the diffusion coefficient of water into the polymer matrix provided an activation energy for the migration process. The data suggest that water plasticizes poly(methyl methacrylate) via specific local interactions with the backbone.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1977.070210202
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  • 5
    Electronic Resource
    Electronic Resource
    Solid phase extraction and analysis of horse urine for aminocaproic acid (1990)
    Springer
    Chromatographia 30 (1990), S. 309-310 
    Details
    ISSN: 1612-1112
    Keywords: Column liquid chromatography ; Thin-layer ; GC/MS ; Aminocaproic acid in horse urine ; Solid phase extraction
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary A rapid and efficient procedure is described for extraction and determination of aminocaproic acid in horse urine. Urine was extracted by passing through a bonded silica column (Bond-Elut). The adsorbed drug was washed free of endogenous materials before being eluted. The extract was then examined by thin-layer chromatography and HPLC. The purity of the extract was determined by gas chromatography-mass spectrometry.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02319713
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  • 6
    Electronic Resource
    Electronic Resource
    Simple and rugged SPE method for the determination of tetracycline antibiotics in serum by HPLC using a volatile mobile phase (1997)
    Springer
    Chromatographia 44 (1997), S. 187-190 
    Details
    ISSN: 1612-1112
    Keywords: Column liquid chromatography ; Solid phase extraction ; Tetracycline in serum
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary A simple and rugged SPE method for the determination of tetracycline (TC), minocycline (MC) and demeclocycline (DCC) in porcine serum by high performance liquid chromatography (HPLC) was developed. The spiked serum sample was pretreated with 2% phosphoric acid followed by a simple and rugged solid-phase extraction procedure using the OasisTM HLB extraction cartridges. High and reproducible recoveries were obtained even though the cartridges were run dry. The extracted sample analytes were injected onto a Waters SymmetryShieldTM RP8 column. The mobile phase was a simple volatile solution containing 0.1% TFA, 2% methanol and 7% acetonitrile in Water. The antibiotics were detected at 350 nm. The calibration curves were linear from 2.0 to 25.0 μg mL−1 of TC and MC with DCC as the internal standard at a concentration of 25.0 μg mL−1. For six replicate analyses, the average recoveries of TC and MC from porcine serum sample fortified at the level of 2.5 μg mL−1 were 96.1% with 1.3% RSD and 101% with 0.54% RSD; at level of 0.5 μg mL−1 the average recoveries were 88% with 1.6% RSD and 97.8% with 1.4% RSD.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02466454
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  • 7
    Electronic Resource
    Electronic Resource
    Oxygen transfer into mycelial pellets (1966)
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 8 (1966), S. 456-460 
    Details
    ISSN: 0006-3592
    Keywords: Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bit.260080311
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  • 8
    Electronic Resource
    Electronic Resource
    Some aspects of the metabolism of a partially colloidal substrate (1968)
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 10 (1968), S. 189-203 
    Details
    ISSN: 0006-3592
    Keywords: Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: The biochemical oxygen demand (BOD) of a complex, partially colloidal substrate is divided into oxidation (fo) and synthesis (fs) fractions. The substrate being investigated is a suspension containing 10 mg./l. of dry skim milk. The oxidized and synthesized fractions of the BOD are shown to be 38.4% and 61.6%, respectively. The division of BOD is related to the time at which maximum cell growth appears. The time required to obtain maximum cell production is shown to be at least 10 hr. The relationship between the time to maximum cell production and the apparent initial activity of the seed organisms is discussed.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bit.260100207
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  • 9
    Electronic Resource
    Electronic Resource
    The effects of glucose and oxygen on the cytochromes and metabolic activity of yeast batch cultures. II. Candida utilis (1971)
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 13 (1971), S. 169-184 
    Details
    ISSN: 0006-3592
    Keywords: Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Candida utilis was grown in batch culture with and without oxygen control. The concentrations of A-, B-, and C-type cytochromes were found to vary with the initial glucose concentration, with the dissolved oxygen concentration, and with time. A-type was the most sensitive. After glucose was essentially exhausted, the yeast catabolized ethanol, if it had been growing in a relatively low initial glucose concentration, or non-glucose carbohydrate, including some of that previously accumulated within the cell, if it had been growing in a high initial glucose concentration. This difference in metabolic pattern could explain why cytochrome derepression was initiated soon after glucose uptake ceased only if initial glucose had been relatively low. The effects of glucose and dissolved oxygen concentrations on yeast cytochromes and respiratory activity are discussed.
    Additional Material: 7 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bit.260130202
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  • 10
    Electronic Resource
    Electronic Resource
    The electroinitiated polymerization of N-vinylcarbazole with zinc bromide, IIPart I: cf.12.. Kinetics of polymerization (1973)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 169 (1973), S. 177-189 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Die elektroinitiierte Polymerisation von N-Vinylcarbazol (VCZ) wurde in Aceton bei 25°C mit Zinkbromid als Katalysator unter Verwendung von Platinelektroden eingehend untersucht. Die Polymerisationsgeschwindigkeit erwies sich als direkt abhängig von der Stromstärke, der Zinkbromid-Konzentration und dem anfänglichen Wassergehalt des Solvens.Die Molekulargewichte der entstandenen Polymeren (1000-6000) sind unabhängig von der Stromstärke, der Zinkbromid-Konzentration und dem Umsetzungsgrad des Monomeren zum Polymeren, werden jedoch beeinflußt durch Wasser, die Monomerkonzentration und das Elektrodenmaterial. Die chemische Zusammensetzung der Polymeren ändert sich nicht mit der Stromstärke, der Zinkbromid-Konzentration, dem Umsetzungsgrad und dem Elektrodenmaterial. Sie ändert sich jedoch ein wenig mit dem Wassergehalt des Acetons.
    Notes: The electroinitiated polymerization of N-vinylcarbazole (VCZ) in acetone solvent at 25°C with zinc bromide, as catalyst, and platinum electrodes was investigated in detail. The polymerization rate was found to be directly dependent on current strength, zinc bromide concentration and the initial water content of the solvent.The molecular weights of the formed polymers (1000-6000) are independent of current strength, zinc bromide concentration and degree of conversion of monomer to polymer, but are affected by water, monomer concentration, and by the type of electrodes used. The chemical composition of the polymer is invariant with current strength, zinc bromide concentration, degree of conversion, and electrode material but does vary slightly with the water content of acetone.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1973.021690117
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