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  • 1
    Electronic Resource
    Electronic Resource
    Thermal stability of copolymers of vinyl acetate and methyl acrylate (1989)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 27 (1989), S. 3173-3183 
    Details
    ISSN: 0887-624X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The thermal degradation of a series of copolymers of vinyl acetate and methyl acrylate and the two homopolymers poly(vinyl acetate) and poly(methyl acrylate) obtained using Ce(IV) as initiator has been investigated using differential thermal analysis (DTA) and thermogravimetry (TGA) in dynamic nitrogen. The kinetic parameters E, n, and A have been obtained following several methods of thermogravimetric analyses. The stability increases as the methyl acrylate content in the copolymer composition increases. The incorporation of 5 mol % of vinyl acetate in the copolymer produces a marked decrease in stability compared to the homopolymer poly(methyl acrylate). There is evidence for an intramolecular lactonization process in vinyl acetate - methyl acrylate copolymers.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pola.1989.080270921
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  • 2
    Electronic Resource
    Electronic Resource
    Thermal stability of poly(methyl methacrylate) as polymerized in aqueous media by using redox systems as initiators (1989)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 27 (1989), S. 3161-3171 
    Details
    ISSN: 0887-624X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The thermal degradation of poly(methyl methacrylate) as polymerized in aqueous nitric acid solution using Ce(IV) alone and in combination with isobutyl alcohol, isopropyl alcohol, glucose, maltose, and cellobiose as initiator systems has been investigated using differential thermal analysis (DTA) and thermogravimetry (TGA) in dynamic nitrogen. The kinetic parameters E, n, and A have been obtained following several methods of thermogravimetric analysis. The most stable material was found to be the PMMA sample obtained with Ce(IV), and the Ce(IV)-IBA and Ce(IV)-maltose polymerized samples were the least stable. In the pyrolysis of Ce(IV)-IBA and Ce(IV)-maltose polymerized samples it was found that two reactions occurred, while in the case of the PMMA polymerized with Ce(IV), Ce(IV)-IPA, Ce(IV)-glucose, and Ce(IV)-cellobiose three reactions took place.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pola.1989.080270920
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  • 3
    Electronic Resource
    Electronic Resource
    Study of the morphology of poly(methyl methacrylate) as polymerized by the redox system Ce(IV)-isopropyl alcohol (1989)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 27 (1989), S. 3439-3450 
    Details
    ISSN: 0887-624X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Methyl methacrylate has been polymerized in aqueous nitric acid at 30°C, with the redox system ceric ammonium nitrate-isopropyl alcohol as initiator. The gravimetric method has been used to follow the reaction. After a short induction period polymerization started, and conversion attained a maximum value with extent of reaction, whereas the ceric ion is exhausted. The size, distribution, and number of PMMA particles formed were measured by scanning electron microscope. From the electron micrographs it was found that the particles are formed over a short period, and that the particle size distribution seems to be determined by flocculation and coagulation of the particles, because these are not stabilized. Average-molecular weight was found to increase at high conversions and the molecular weight distribution became broader as particle size increased. Particle size increased with conversion, whereas the number of particles remained constant.
    Additional Material: 13 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pola.1989.080271022
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  • 4
    Electronic Resource
    Electronic Resource
    Heat pulse line-source method to determine thermal conductivity of consolidated rocks (1986)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 57 (1986), S. 2832-2836 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: An instrument designed to measure thermal conductivity of consolidated rocks, dry or saturated, using a transient method is presented. The instrument measures relative values of the thermal conductivity, and it needs calibration to obtain absolute values. The device can be used as heat pulse line source and as continuous heat line source. Two parameters to determine thermal conductivity are proposed: TMAX, in heat pulse line source, and SLOPE, in continuous heat line source. Its performance is better, and the operation simpler, in heat pulse line-source mode with a measuring time of 170 s and a reproducibility better than 2.5%. The sample preparation is very simple on both modes. The performance has been tested with a set of ten rocks with thermal conductivity values between 1.4 and 5.2 W m−1 K−1 which covers the usual range for consolidated rocks.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1139052
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  • 5
    Electronic Resource
    Electronic Resource
    High-temperature superconductor opening switch (1989)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 54 (1989), S. 949-950 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A jitter-free, repetitive opening switch made of YBa2Cu3O7−x high-temperature superconductor is demonstrated. The switch conducts electrical current at no loss when it is superconducting. A pulse or pulse train of magnetic field on the order of 100 G causes the transition of the switch from the superconducting state to the resistive normal state and forces current to flow through a load resistor that is connected in parallel with the switch. Repetitive operation of this switch at rep rates higher than 1 kHz has been demonstrated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.100816
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  • 6
    Electronic Resource
    Electronic Resource
    Marine Amoebae from Waters of Northwest Spain, with Comments on a Potentially Pathogenic Euryhaline Species (1989)
    Oxford, UK : Blackwell Publishing Ltd
    The @journal of eukaryotic microbiology 36 (1989), S. 0 
    Details
    ISSN: 1550-7408
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Of 17 species of free-living amoebae identified in various samples of salt water, only 1. Acanthamoeba polyphaga, is known to be a potential pathogen. While no deaths occurred when laboratory animals were inoculated with A. polyphaga to test for pathogenicity, the protozoa were present in the brain, liver and lungs of some but not all of the animals.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1550-7408.1989.tb05356.x
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  • 7
    Electronic Resource
    Electronic Resource
    Molecular cloning of a Salmonella typhi LT-like enterotoxin gene (1988)
    Oxford, UK : Blackwell Publishing Ltd
    Molecular microbiology 2 (1988), S. 0 
    Details
    ISSN: 1365-2958
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Medicine
    Notes: Diarrhoea is a common event during typhoid fever; nevertheless, the possible participation of a diarrhoea-inducing enterotoxin has not been described (Roy et al., 1985). Recombinant bacteriophage λ FDC1 was isolated from a genomic library of Salmonella typhi, the causal agent of typhoid fever, by screening with a probe for the B subunit gene of the heat-labile, cholera-like, Escherichia coli enterotoxin (LT). λ FDC1 codes for an enterotoxin that causes secretion in rat ileal loops, that elongates Chinese hamster ovary (CHO) cells, that is recognized by antibodies against LT, and does not bind in vitroto ganglioside GM1. These results should allow further studies towards elucidating a possible role for the S. typhi enterotoxin in the pathogenesis of typhoid fever.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2958.1988.tb00094.x
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  • 8
    Electronic Resource
    Electronic Resource
    Distribution and remobilization of symbiotically fixed nitrogen in soybean (Glycine max) (1985)
    Oxford, UK : Blackwell Publishing Ltd
    Physiologia plantarum 65 (1985), S. 0 
    Details
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Partitioning of nitrogen by soybeans (Glycine max L. Merr. cv. Hodgson) grown in natural conditions was studied by successive exposures of root systems to 15N2 and periodical measurements of 15N distribution. Nitrogen derived from the atmosphere was mainly found in the aerial parts of the plants, and the stage of development exerted a strong influence on the initial 15N distribution (measured one week after incorporation). Until day 69 after sowing, leaf blades contained 47 to 57% of the fixed N. After that, reproductive structures attracted increasing proportions, 10 to 60% between days 69 and 92. Around day 82, stems and petioles stored up to 30% of the newly fixed N. During pod development and pod filling and until maturity, fixed N was remobilized from vegetative tissues and pod walls to seeds. These transfers first concerned the newly incorporated N, but at maturity 80 to 90% of the total was recovered in the seeds. The high mobility of N originating from the atmosphere as compared to that coming from the soil (vegetative tissues exported only 50% of their total N) seems to indicate that fixed N was at least partially integrated in a special pool. This was certainly the case at the later stage of N2 fixation, when a large portion of fixed N accumulated in the stems and petioles, probably in the form of storage compounds such as ureides for later transfer to the developing seeds. Further research is needed in order to investigate the nature and role of this pool in the nitrogen nutrition of soybeans.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1399-3054.1985.tb02396.x
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  • 9
    Electronic Resource
    Electronic Resource
    Neubestimmung der Struktur von Tribromobis(pyridin-N-oxid)thallium(III) (1986)
    Oxford [u.a.] : International Union of Crystallography (IUCr)
    Acta crystallographica 42 (1986), S. 60-62 
    Details
    ISSN: 1600-5759
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0108270186097317
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  • 10
    Electronic Resource
    Electronic Resource
    Collagen synthesis by human bone marrow fibroblasts (1987)
    Springer
    Cellular and molecular life sciences 43 (1987), S. 1223-1225 
    Details
    ISSN: 1420-9071
    Keywords: Collagen ; bone marrow ; acute lymphoblastic leukemia ; fibroblasts
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Collagen synthesis was measured in fibroblast cultures derived from normal and acute lymphoblastic leukemia (ALL) bone marrow. Collagen production was higher in normal than in ALL fibroblasts. These cells elaborate type I and type III procollagens in a ratio that depends on cell density and whether cells originate from normal or ALL bone marrow.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01945534
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