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  • Springer  (29)
  • 1995-1999  (29)
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  • 1
    Electronic Resource
    Electronic Resource
    On the Decoding of Cyclic Codes Using Gröbner Bases (1997)
    Springer
    Applicable algebra in engineering, communication and computing 8 (1997), S. 469-483 
    Details
    ISSN: 1432-0622
    Keywords: Keywords: Decoding ; Cyclic codes ; Gröbner basis ; Zero-dimensional ideals.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science , Mathematics , Technology
    Notes: Abstract.  In this paper we revisit an algorithm presented by Chen, Reed, Helleseth, and Troung in [5] for decoding cyclic codes up to their true minimum distance using Gröbner basis techniques. We give a geometric characterization of the number of errors, and we analyze the corresponding algebraic characterization. We give a characterization for the error locator polynomial as well. We make these ideas effective using the theory of Gröbner bases. We then present an algorithm for computing the reduced Gröbner basis over ?2 for the syndrome ideal of cyclic codes, with respect to a lexicographic term ordering. This algorithm does not use Buchberger’s algorithm or the multivariable polynomial division algorithm, but instead uses the form of the generators of the syndrome ideal and an adaptation of the algorithm introduced in [11]. As an application of this algorithm, we present the reduced Gröbner basis for the syndrome ideal of the [23, 12, 7] Golay code, and a decoding algorithm.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002000050084
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  • 2
    Electronic Resource
    Electronic Resource
    Soy-based medium for ethanol production byEscherichia coli KO11 (1996)
    Springer
    Journal of industrial microbiology and biotechnology 16 (1996), S. 374-376 
    Details
    ISSN: 1476-5535
    Keywords: soy ; hydrolysate ; nutrient ; fermentation ; ethanol ; amino acids
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract An optimized soy-based medium was developed for ethanol production byEscherichia coli KO11. The medium consists of mineral salts, vitamins, crude enzymatic hydrolysate of soy and fermentable sugar. Ethanol produced after 24 h was used as an endpoint in bioassays to optimize hydrolysate preparation. Although longer fermentation times were required with soy medium than with LB medium, similar final ethanol concentrations were achieved (44–45 g ethanol L−1 from 100 g glucose L−1). The cost of materials for soy medium (excluding sugar) was estimated to be $0.003 L−1 broth, $0.006 L−1 ethanol.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01570119
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  • 3
    Electronic Resource
    Electronic Resource
    Isolation and characterization of ethanol-tolerant mutants of Escherichia coli KO11 for fuel ethanol production (1998)
    Springer
    Journal of industrial microbiology and biotechnology 20 (1998), S. 132-138 
    Details
    ISSN: 1476-5535
    Keywords: Keywords: ethanol; ethanol tolerance; fermentation; xylose; biomass; lignocellulose
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Genetically engineered Escherichia coli KO11 is capable of efficiently producing ethanol from all sugar constituents of lignocellulose but lacks the high ethanol tolerance of yeasts currently used for commercial starch-based ethanol processes. Using an enrichment method which selects alternatively for ethanol tolerance during growth in broth and for ethanol production on solid medium, mutants of KO11 with increased ethanol tolerance were isolated which can produce more than 60 g ethanol L−1 from xylose in 72 h. Ethanol concentrations and yields achieved by the LY01 mutant with xylose exceed those reported for recombinant strains of Saccharomyces and Zymomonas mobilis, both of which have a high native ethanol tolerance.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/sj.jim.2900496
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  • 4
    Electronic Resource
    Electronic Resource
    Effects of process errors on the production of ethanol by Escherichia coli KO11 (1998)
    Springer
    Journal of industrial microbiology and biotechnology 20 (1998), S. 281-286 
    Details
    ISSN: 1476-5535
    Keywords: Keywords: lignocellulose; biomass; fermentation; ethanol; E. coli KO11; xylose; process errors; process upsets
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Escherichia coli KO11 was previously constructed for the production of ethanol from both hexose and pentose sugars in hemicellulose hydrolysates by inserting the Zymomonas mobilis genes encoding pyruvate decarboxylase (pdc) and alcohol dehydrogenase (adhB). This biocatalyst appears relatively resistant to potential process errors during fermentation. Antibiotics were not required to maintain the maximum catabolic activity of KO11 even after deliberate contamination with up to 10% soil. Fermentations exposed to extremes of temperature (2 h at 5°C or 50°C) or pH (2 h at pH 3 or pH 10) recovered after re-adjustment to optimal fermentation conditions (35°C, pH6) although longer times were required for completion in most cases. Ethanol yields were not altered by exposure to extremes in temperature but were reduced by exposure to extremes in pH. Re-inoculation with 5% (by volume) from control fermentors reduced this delay after exposure to pH extremes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/sj.jim.2900524
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  • 5
    Electronic Resource
    Electronic Resource
    Oxidative dehydrogenation of ethane over La1−xSrxFeO3−δ perovskite oxides (1996)
    Springer
    Catalysis letters 38 (1996), S. 189-195 
    Details
    ISSN: 1572-879X
    Keywords: perovskite ; La1−xSrxFeO3−δ ; dehydrogenation ; oxidation ; ethane
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Catalysts of the composition La1−xSrxFeO3−δ, 0⩽x ⩽1, have been tested for the oxidative dehydrogenation of ethane in the temperature range 300–800°C. The catalyst is active above 400°C, giving a maximum yield of 37% ethylene at 650°C. Above 650°C, synthesis gas was formed together with methane, suggesting that the reforming reaction and thermal cracking of ethane took place. The catalytic data are compared to conductivity measurements on the same material, and a good correlation between the activity and p-type conductivity has been found. In the phase diagram for the system LaFeO3-SrFeO3−δ, a phase separation to two types of (La, Sr)FeO3−δ perovskites was observed in the La/Sr binary composition in the temperature range below 800°C. The phase separation can elucidate the dependency of the catalytic activity on its p-type conductivity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00806567
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  • 6
    Electronic Resource
    Electronic Resource
    Long-Term Effects of Frequent Low-Intensity Burning on the Abundance of Litter-Dwelling Invertebrates in Coastal Blackbutt Forests of Southeastern Australia (1999)
    Springer
    Journal of insect conservation 3 (1999), S. 191-199 
    Details
    ISSN: 1572-9753
    Keywords: invertebrates ; fire ; forests ; litter sampling ; pitfall-trapping
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Nature of Science, Research, Systems of Higher Education, Museum Science
    Notes: Abstract Low-intensity fire is extensively used in Australian dry eucalypt forests to reduce fuel levels. The long-term impact of this management practice on terrestrial invertebrates is, however, unknown and is of concern given their contribution to ecosystem function and forest biodiversity. This study found that areas subjected to frequent low-intensity fire had significantly lower numbers of spiders, ticks and mites, pseudoscorpions, woodlice, springtails, bugs, beetles, ants and insect larvae in the leaf litter compared with adjacent unburnt areas. Taxa numbers were between 41 and 82% lower and these reductions in abundance have led to an overall decline in taxon richness. This decrease was attributed to a reduction in the amount of litter and associated moisture levels, and a simplification of habitat structure. The extent of local and regional extinctions will depend upon the scale of this disturbance, with future studies investigating the impact on individual species within these communities. A comparison of two sampling techniques, pitfall-trapping and litter extraction, highlighted important considerations for spatial components of invertebrate sampling designs.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1009643627781
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  • 7
    Electronic Resource
    Electronic Resource
    Expressed Peromyscus maniculatus (Pema) MHC class I genes: evolutionary implications and the identification of a gene encoding a Qa1-like antigen (1996)
    Springer
    Immunogenetics 44 (1996), S. 177-185 
    Details
    ISSN: 1432-1211
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract  To gain insight into the evolution of rodent major histocompatibility complex (MHC) class I genes and identify important (conserved) nonclassical class I (class I b) gene products and residues in these proteins, six Peromyscus maniculatus MHC (Pema) class I cDNA clones were isolated and sequenced. Five Pema class I cDNAs appeared most similar to mouse and rat classical class I (class I a) genes. One exhibited highest similarity to an H2 class I b gene, H2-T23 (encoding the Qa1 antigen). Phylogenetic trees constructed with Pema, RT1, and H2 class I sequences suggested that the lineages of some rodent class I b genes (e. g., T23 and T24) originated prior to Mus and Peromyscus speciation [〉50 million years (My) ago]. Sequences of four Qa1-like proteins from three species permitted the identification of ten Qa1-specific amino acids. On the basis of molecular modeling, three residues showed the potential to interact with T-cell receptors and three residues (all corresponding to polymorphic positions among H2 class I a proteins) were predicted to influence antigen binding. The recognition of mouse Qa1 proteins by a subset of T-cells in influenced by a locus, Qdm, which encodes the H2-D leader peptide. One of the Pema class I cDNA clones classified as H2-K, D/L-like (class I a) is predicted to encode an identical peptide, implying that an antigen binding protein (Qa1) and the antigen to which it binds (the product of Qdm) has been conserved for over 50 My.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002510050109
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  • 8
    Electronic Resource
    Electronic Resource
    Characterisation of the active phase in caesium-doped iron-vanadium-oxide catalysts for the selective oxidation of polyaromatics (1997)
    Springer
    Catalysis letters 43 (1997), S. 107-115 
    Details
    ISSN: 1572-879X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The addition of caesium sulphate to unsupported vanadium-iron-oxide materials leads to the formation of an amorphous non-stoichiometric phase, as well as the crystalline phases, FeVO4, Fe2V4O13, and Fe1-XS (pyrrhotite). Caesium was only present in the amorphous parts of the sample, and the amount of the new phase formed was found to vary depending on the vanadium:iron ratio and the amount of caesium dopant added. The new phase contains Fe3+ ions with oxide lattice vacancies in their coordination sphere, i.e. Fe3+-VO(e-) species. Catalytic testing demonstrated that the caesium-doped samples were more selective for the oxidation of fluorene to 9-fluorenone. The role of the caesium is probably to modify the surface acidity of the catalyst and act in the formation of stable oxide lattice vacancies.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1018926219595
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  • 9
    Electronic Resource
    Electronic Resource
    Comparison of the group V and VI transition metal carbides for methane dry reforming and thermodynamic prediction of their relative stabilities (1999)
    Springer
    Catalysis letters 57 (1999), S. 65-69 
    Details
    ISSN: 1572-879X
    Keywords: methane ; synthesis gas ; dry reforming ; transition metal carbides
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The group V and VI transition metal carbides have been prepared by CH4 TPR, and tested for the dry reforming of methane with carbon dioxide, at elevated pressure. Mo2C and WC were the most stable catalysts, while the group V metal carbides showed the stability order: vanadium $${\text{ 〉}}$$ niobium $${\text{ 〉}}$$ tantalum. Catalyst deactivation was due to carbide oxidation with CO2, while stability was associated with the reaction of metal oxide (from deactivation) with CH4, giving the metal carbide. Calculation of the Gibbs free energy for this reaction resulted in a predicted catalyst stability trend similar to that obtained experimentally.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1019062608228
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  • 10
    Electronic Resource
    Electronic Resource
    Supported binary oxide monolayers as selective oxidation catalysts: Bi2Mo3O12/TiO2 (1999)
    Springer
    Catalysis letters 57 (1999), S. 55-60 
    Details
    ISSN: 1572-879X
    Keywords: bismuth molybdate ; titania ; supported binary oxide monolayers ; selective oxidation catalysts ; 1-butene oxidation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Monolayers of bismuth molybdates supported on low-area TiO2 (anatase) catalyse the oxidation/isomerisation of 1-butene to butadiene and 2-butenes with combined selectivities of 80–100% and show significantly lower specific rates of deep oxidation than does $$\alpha$$ -Bi2Mo3O12. As loadings are increased above 2 wt% (equivalent to one monolayer), selectivities remain high and, although the butadiene yields are generally only moderate, in some cases they exceed that shown by the unsupported $$\alpha$$ -phase.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1019018825975
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