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  • Polymer and Materials Science  (22)
  • Auditory cortex  (2)
  • Phthalocyanines  (2)
  • Solid phase extraction  (2)
  • 1
    Electronic Resource
    Electronic Resource
    The effect of solvent deuteration on the photophysics of sulphonated aluminium phthalocyanine
    Amsterdam : Elsevier
    Journal of Photochemistry and Photobiology B: Biology 16 (1992), S. 73-81 
    Details
    ISSN: 1011-1344
    Keywords: Phthalocyanines ; photosensitization ; singlet oxygen ; solvent deuteration ; triplet lifetime.
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/1011-1344(92)85154-M
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Preparative, analytical and fluorescence spectroscopic studies of sulphonated aluminium phthalocyanine photosensitizers
    Amsterdam : Elsevier
    Journal of Photochemistry and Photobiology B: Biology 9 (1991), S. 87-95 
    Details
    ISSN: 1011-1344
    Keywords: Phthalocyanines ; photodynamic therapy. ; photosensitizers ; time-correlated single-photon counting
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/1011-1344(91)80006-4
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Responses of single neurones in cat auditory cortex to time-varying stimuli: frequency-modulated tones of narrow excursion (1985)
    Springer
    Experimental brain research 58 (1985), S. 443-454 
    Details
    ISSN: 1432-1106
    Keywords: Auditory cortex ; Single neurones ; FM tones
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary In the primary auditory cortex of cats anaesthetized with nitrous oxide, single neurones were examined with respect to their responses to tone bursts and linear modulations of the frequency of an on-going continuous tone. Using FM ramps of 2.0 kHz excursion and varying centre frequency, each of 39 neurones was examined for its preference for the direction of frequency change of a ramp whose centre frequency was varied in and around the neurone's response area. Direction preference was strictly associated with the slopes of the cell's spike count-versus-frequency function over the frequency range covered by the ramp. Preferences for upward- and downward-directed ramps were associated with the low- and high-frequency slopes of the spike count function, respectively. The strength of the cell's direction preference was associated with the relative steepness of the spike count function over the frequency range covered by the ramp. The timing of discharges elicited by the frequency modulations was found to be the sum of the cell's latent period for tone bursts plus the time after ramp onset that the stimulus frequency fell within the neurone's response area. The implications of these data for the processing of narrow and broad frequency-modulated ramps are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00235862
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  • 4
    Electronic Resource
    Electronic Resource
    Responses of single neurons in cat auditory cortex to time-varying stimuli: linear amplitude modulations (1987)
    Springer
    Experimental brain research 67 (1987), S. 479-492 
    Details
    ISSN: 1432-1106
    Keywords: Auditory cortex ; Single neurons ; AM tones ; Rate intensity function ; Complex stimuli
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Single neurons in the auditory cortex of anesthetized cats were examined quantitatively for their sensitivity to the sound pressure level of characteristic frequency (CF) tone pulses, and to 6 dB, linear modulations in the amplitude of a continuous CF carrier tone. The direction and rate of amplitude modulation (AM), and the carrier level on which it was imposed, were manipulated parametrically. Studied with amplitude modulations, the majority of neurons responded only to intensity increments. The minimum carrier level upon which an amplitude modulation was able to evoke spike discharges was typically comparable to the tone pulse threshold SPL. For many neurons, an “intensity increment response area”, i.e., the domain of AM rate and carrier level conjunctions within which a 6 dB AM was able to evoke discharges, could be delimited. For many neurons, preferred rate of AM drifted from high to low with increases in the carrier level on which the modulation was imposed. The most vigorous responses to AM stimuli often occurred when the carrier levels were associated with the rising slope or the peak of the tone pulse rate intensity function. It may be possible to understand the general form of AM response areas in terms of short-term adaptation, the disposition of excitatory and inhibitory tone pulse response areas, and the spectra of the AM stimuli used.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00247281
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  • 5
    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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  • 6
    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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  • 7
    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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    Paper (German National Licenses)
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  • 8
    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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  • 9
    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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  • 10
    Electronic Resource
    Electronic Resource
    Photosensitized dehydrochlorination of poly(vinyl chloride). I. Effect of commercial additives (1978)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 22 (1978), S. 1129-1134 
    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: A commercial formulation of thermal antioxidant has been shown to photosensitize the dehydrochlorination of poly(vinyl chloride). The species responsible was shown to be a p-alkyl-substituted phenol, and this was confirmed using p-cresol as a model compound.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1978.070220421
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