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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Algebra universalis 44 (2000), S. 1-14 
    ISSN: 1420-8911
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract. We show that every subdirectly irreducible Ockham chain belongs to the generalised variety K ω and is countable. Consideration of three particular types of finite Ockham chains, together with their order duals, leads to a determination of the structure of all finite subdirectly irreducible Ockham chains. These belong necessarily to the Berman classes K 1, q and we show that there are precisely 6 q +2 such chains in K 1, q . We also show that there are precisely 14 subdirectly irreducible Ockham chains whose endomorphism semigroup is regular, such chains having at most 5 elements.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    World journal of microbiology and biotechnology 14 (1997), S. 223-228 
    ISSN: 1573-0972
    Keywords: Batch culture ; cyanobacterium ; extracts ; rhizobia
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract Extracts from Nostoc sp. biomass (CE) were compared with yeast extract (YE) in the formulation of media for cultivation of Rhizobium etli and Bradyrhizobium japonicum. Growth depended on the rhizobium strain and also on the type and concentration of the extract. The growth kinetics of R. etli were substantially influenced by the addition of CE an YE at concentrations between 0.3 and 1% (w/v); cultures containing YE showed shorter lag periods and higher growth rates and those with CE presented higher growth yields. Depending on the extracts, a different behaviour was displayed by the cultures at the stationary phase; cell viability increased or remained fairly constant in cultures developed on CE, and those developed on high concentrations of YE showed a decline in viable cell counts.
    Type of Medium: Electronic Resource
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