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  • 1
    Electronic Resource
    Electronic Resource
    Velocities and quality factors of sedimentary rocks at low and high effective pressures (1995)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical journal international 123 (1995), S. 0 
    Details
    ISSN: 1365-246X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: Techniques for measuring acoustic velocities and quality factors (Q) of sedimentary rocks in the laboratory are sufficiently accurate to establish closely fitting regression curves which represent the variation of these acoustic properties with pressure. Ultrasonic P- and S-wave measurements of velocity (Vp, Vs) and Q (Qp, Qs) were made on 16 different water-saturated sandstone samples at various effective pressures using an ultrasonic reflection technique, and the data were fitted using a simple regression equation containing a constant, plus linear and exponential pressure-dependent terms. The redundancy of the linear term in the regression of Q data suggests that microcracks alone govern the pressure variation of Q, whereas velocities are additionally dependent on another mechanism, consistent with the changes in elastic moduli caused by intergranular compression (causing small reductions in porosity). The implied rates of microcrack closure with increasing effective pressure in all samples were found to be comparable.The regression equations describe the data closely enough to enable the extrapolation of acoustic properties to both low and high effective pressures. This is of practical use, since laboratory techniques can produce uncertain results at low pressures, due to coupling problems and low signal strengths, whilst high pressures require large confining vessels. Low-pressure and high-pressure data are applicable to shallow seismic surveys and hydrocarbon exploration, respectively.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-246X.1995.tb06889.x
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  • 2
    Electronic Resource
    Electronic Resource
    Diallel analysis of four resistance components to Septoria tritici in six crosses of wheat (Triticum aestivum) (1998)
    Oxford, UK : Blackwell Publishing Ltd
    Plant breeding 117 (1998), S. 0 
    Details
    ISSN: 1439-0523
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Four resistance components, i.e. incubation period, latent period, maturation period and pycnidial coverage, were studied in a diallel cross of four wheat cultivars differing in susceptibility to Septoria tritici. Inoculations and evaluations were carried out at the fourth leaf stage for two years. A combined ANOVA for both years exhibited a significant interaction between crosses and years for maturation period. A separate ANOVA for each year was done for this trait. The combined ANOVA showed that crosses were significantly different for incubation, latent period and pycnidial coverage. Cross effects were also significant for maturation period in each year for the separate ANOVA. Year effects were significant for latent period and maturation period. General combining ability (GCA) was significant and preponderant for incubation period, latent period and pycnidial coverage. For maturation period, the separated ANOVA showed the significance of the GCA for both years. Specific combining ability (SCA) was significant for incubation and pycnidial coverage and for maturation in one year. The preponderance of the additive genetic variance for all traits indicates the possibility of selecting for them in order to obtain improved cultivars. Incubation period was inherited independently of maturation period and pycnidial coverage, indicating that combinations of some of those characters may lead to more effective and durable resistance.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1439-0523.1998.tb01464.x
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  • 3
    Electronic Resource
    Electronic Resource
    Kinetic and antigenic similarities for cellobiose dehydrogenase from the brown rot fungus Coniophora puteana and the white rot fungus Phanerochaete chrysosporium (1996)
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology letters 145 (1996), S. 0 
    Details
    ISSN: 1574-6968
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Abstract Cellobiose dehydrogenase was purified from the brown rot fungus Coniophora puteana. Strong cross-reaction was observed with antibodies to cellobiose:quinone oxidoreductase from the white rot fungus Phanerochaete chrysosporium. Kinetic measurements were made with cellobiose as electron donor. Ferricyanide and DCPIP both showed a pH optimum close to pH 4, but activity with ferricyanide declined more rapidly when the pH was raised. Dioxygen reduction to hydrogen peroxide was observed, but at a much lower rate than for other acceptors. These properties are similar to those of cellobiose dehydrogenase from P. chrysosporium, despite differences between brown and white rot modes of decay.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1574-6968.1996.tb08613.x
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  • 4
    Electronic Resource
    Electronic Resource
    Expression of genes involved in phycocyanin biosynthesis following recovery of Synechococcus PCC 6301 from nitrogen starvation, and the effect of gabaculine on cpc Ba transcript levels (1996)
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology letters 140 (1996), S. 0 
    Details
    ISSN: 1574-6968
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Abstract The effect of the tetrapyrrole biosynthesis inhibitor gabaculine on the expression of specific genes involved in phycocyanin biosynthesis was investigated in cultures of Synechococcus PCC6301 in nitrogen chlorosis, and during recovery to nitrogen sufficiency. Patterns of transcription of the cpc BA (phycocyanin subunits), hemL (glutamate semialdehyde aminotransferase) and hemB (aminolaevulinate dehydratase) genes were visualised by Northern blotting and gene product formation for cpcBA, hemL and the gene for glu tRNA synthetase were monitored by Western blotting. Inhibition of phycobilin biosynthesis by gabaculine greatly decreased production of phycocyanin protein and of cpcBA transcript, indicating a tight coordination of apoprotein biosynthesis with chromophore supply at the level of transcription. Different patterns of response were observed with the other genes at the level of transcript formation or gene product synthesis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1574-6968.1996.tb08320.x
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