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  • 1
    Digitale Medien
    Digitale Medien
    Latencies and correlation in single units and visual evoked potentials in the cat striate cortex following monocular and binocular stimulations (1972)
    Springer
    Experimental brain research 14 (1972), S. 409-422 
    Details
    ISSN: 1432-1106
    Schlagwort(e): Striate Cortex ; Monocular and Binocular Stimulations ; Neuronal Responses ; Local and Surface VEPs ; Latencies ; Phase Relationships ; Algebraic Summation
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Summary The post-stimulus-time histograms of single unit responses recorded extracellularly from simple and complex cells in the paralyzed cat's striate cortex were compared both with the averaged visual evoked potential (VEP) recorded with the same stainless steel microelectrode and with the averaged surface VEP recorded with a silver-ball electrode applied close to the locus of microelectrode penetration. Diffuse and patterned white light stimuli, projected on a tangent screen in front of the animal, were used monocularly and binocularly at an intensity range over 2.5 log units. The latencies of spike responses to contralateral stimuli were found on the average shorter than those to ipsilateral and generally equal to those following binocular stimulation. The reciprocals of latencies as function of log stimulus intensity of the surface VEPs had the same gradient as those from averaged unit responses. In recordings from any given cell, the spike discharges displayed a fixed phase relationship to the local and another to the surface VEP, but this was not necessarily identical in different cells. These discharges may be related to the negative and positive phases of both types of slow waves. The surface and local VEPs elicited by binocular diffuse light stimulation represent the algebraic summation of the VEPs produced by ipsi- and contralateral stimulations, which confirms and expands earlier studies. No algebraic summation was found in the spike response, the sum of the two monocular responses being in most cases larger than the binocular.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00235036
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  • 2
    Digitale Medien
    Digitale Medien
    Preparation and stress-strain properties of SBS and SIS block polymers made with dilithium initiators (1972)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 16 (1972), S. 163-173 
    Details
    ISSN: 0021-8995
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Maschinenbau , Physik
    Notizen: ABA-type block polymers of styrene (monomer A) and isoprene or butadiene were prepared using two commercially available dilithium adducts of isoprene as initiators. One (DiLi-1) was predominantly dilithio diisoprene and contained a small amount of dimethyl ether (ether/Li 〉 1.0). The second (DiLi-1 C.E.) was a higher molecular weight version of DiLi-1, containing about seven isoprene units per molecule. It contained only a trace of dimethyl ether (ether/Li 〈 0.1). Polymers were made by charging all of the monomers at the start of the reaction. The diene polymerized first, incorporating some styrene. When the diene was consumed, the difunctional polymer chains then added a block of nearly pure polystyrene at each end. Thus an ABA-type polymer was synthesized in one step. These polymers show the usual behavior of pseudo-vulcanized elastomers. Their stress-strain curves are given. The SBS polymers had the higher tensile strengths. None had tensile strengths as high as SBS or SIS polymers made with n- or sec-butyllithium. It was shown that the diene blocks contain appreciable amounts of styrene. This leads to more compatibility between the A and B blocks; it also shortens the styrene blocks compared to the theoretical lengths of “pure” blocks. Both effects can lead to loss of tensile strength. Microstructures of the diene homopolymers made with these initiators are also given.
    Zusätzliches Material: 6 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/app.1972.070160115
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  • 3
    Digitale Medien
    Digitale Medien
    Decomposition kinetics of a phenolic-carbon composite. I. Resin available for volatilization (1970)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 14 (1970), S. 747-756 
    Details
    ISSN: 0021-8995
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Maschinenbau , Physik
    Notizen: The isothermal decomposition of a phenolic resin in a phenolic-carbon cloth composite was measured at approximately 0.1 to 0.2 torr over the temperature range of 105°-718°C. The kinetics are initially first order and, in the later stages, second order. An analytic technique is provided for calculating the maximum quantity of resin which will volatilize during decomposition, thereby obviating the necessity of measurements for extended time periods. The amount of resin available for volatilization during decomposition varies with temperature and is in equilibrium with resin, which does not volatilize. Plots of the equilibrium constant versus the reciprocal absolute temperature show that two equilibria are involved: one which predominates up to 352°C and the other above this temperature. The heats of reaction are 2.2 and 15.3 kcal/mole. The first value is associated with hydrogen bonding and the second with decomposition and oxidation activation energies.
    Zusätzliches Material: 6 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/app.1970.070140318
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  • 4
    Digitale Medien
    Digitale Medien
    Decomposition kinetics of a phenolic-carbon composite. II. Rate relationships (1971)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 15 (1971), S. 91-103 
    Details
    ISSN: 0021-8995
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Maschinenbau , Physik
    Notizen: The isothermal decomposition of a phenolic resin in a phenolic-carbon cloth composite was measured in air at 0.1 to 0.2 torr over the temperature range 104-718°C. Two decomposition rate relationships are presented that can be used to predict decomposition. One assumes two second-order consecutive rate-controlling reactions, and the other assumes a diffusion-limited second-order reaction. Two rate constants govern each relationship, one being operative during the initial decomposition stages, and the other during the final stages. Evidence is presented to support the applicability of both relationships to predict decomposition over the entire temperature range studied. Arrhenius plots of the rate constants consist of several segments linearly connected. Activation energies and frequency factors computed from these segments cover a broad range of values. The activation energies are used to correlate the temperature ranges with the predominant products formed in these ranges.
    Zusätzliches Material: 7 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/app.1971.070150108
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  • 5
    Digitale Medien
    Digitale Medien
    Mass spectra of aryl substituted oxazolidones (1970)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 4 (1970), S. 41-53 
    Details
    ISSN: 0030-493X
    Schlagwort(e): Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: The mass spectra of several 4,5-disubstituted-2-oxazolidones and several related N-methyl derivatives have been determined. Fragmentation has been found to be a function of three factors: (1) the size of the alkyl function at C-5, (2) the location of the aryl substituent, and (3) replacement of N—H by N—CH3. In particular, aryl or bulky alkyl groups substituted at C-5 result in protonated aldehyde derived from hydrogen rearrangement from nitrogen. With other substituents, the most intense ions are nitrogen containing fragments. In the latter case the fragmentation pathway has been elucidated with the aid of metastable peaks observed using defocusing techniques.
    Zusätzliches Material: 8 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/oms.1210040105
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