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  • 1
    Electronic Resource
    Electronic Resource
    Morphology of poly(ether sulfone)-modified polycyanurates (1997)
    Springer
    Journal of polymer research 4 (1997), S. 203-211 
    Details
    ISSN: 1572-8935
    Keywords: Aromatic dicyanate ; Phase separation ; Fracture surface ; Iminocarbonate
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Polycyanurates prepared from cure of bisphenol A dicysanate (BPADCy) were modified with either hydroxyl-terminated or cyanated poly(ether sulfone)s (as HPES or CPES, respectively) of different molecular weights. With high molecular weight HPES (or CPES), the resulting resin showed a two-phase morphology in contrast to the single-phase morphology generated from the curing reactions of the low molecular weight HPES (or CPES) and BPADCy as observed from optical microscopy. Results from scanning electron microscopy suggests a discrete-continuous fracture surface for the high molecular weight HPES-modified polycyanurate but for the CPES-modified analogue, a blur interface between particle and matrix was observed. However, this blur interface can also be generated if 1 wt% of catalyst system (n-nonylphenol/cobaltic acetylacetonate) was used during cure of mixtures of high molecular weight HPES and BPADCy. This blur interface in the catalyzed system is attributed to the inter-reactions between the hydroxyl termini in HPES and the cyanate groups in BPADCy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s10965-006-0026-y
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  • 2
    Electronic Resource
    Electronic Resource
    Physiological and symbiotic characteristics of Rhizobium fredii isolated from subtropical-tropical soils (1988)
    Springer
    Biology and fertility of soils 5 (1988), S. 350-354 
    Details
    ISSN: 1432-0789
    Keywords: Rhizobia ; Effective N2-fixation ; Osmotic pressure ; Symbiosis ; Glycine max ; Rhizobium fredii ; Rhizobium japonicum
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Physiological and symbiotic characteristics were identified in Rhizobium fredii isolated from subtropical-tropical soils. The generation times of R. fredii Taiwan isolated-SB 357 and -SB 682 were 1.7 and 2.5 h, respectively. These strains were associated with acid production in yeast-extract mannitol medium. They were able to use hexoses, pentose, sucrose, trehalose and raffinose. Strain SB 357 can resist a high concentration of kanamycin (100 μg ml−1 and penicillin (400 μg ml−1). It can tolerate up to 2.34% NaCl and 1031.3 mosmol kg−1 (23.4 bars). The growth rate of R. fredii SB 357 under the concentration of approximately 450 mosmol kg−1 (10.2 bars) was not affected by salinity, but responded to osmotic pressure. Both strains (SB 357 and SB 682) isolated from subtropical-tropical soils were able to form an effective N2-fixing symbiosis with the US soybean cv Clark lanceolate leaflet.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00262145
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    Paper (German National Licenses)
    Fulltext
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