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  • 1
    Electronic Resource
    Electronic Resource
    Neuron-Like Cells in Culture of Tuberous Sclerosis Tissue (1991)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 615 (1991), S. 0 
    Details
    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1749-6632.1991.tb37761.x
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  • 2
    Electronic Resource
    Electronic Resource
    Origin of the Neuron-Like Cells in Tuberous Sclerosis Tissues (1991)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 615 (1991), S. 0 
    Details
    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1749-6632.1991.tb37762.x
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  • 3
    Electronic Resource
    Electronic Resource
    Calciturbidite composition related to exposure and flooding of a carbonate platform (Triassic, Eastern Alps) (1991)
    Oxford, UK : Blackwell Publishing Ltd
    Sedimentology 38 (1991), S. 0 
    Details
    ISSN: 1365-3091
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: The compositional variation of calciturbidites (Pedata/Pötschen Formation), deposited adjacent to the Dachstein Formation carbonate platform in the Triassic Hallstatt Basin, was analysed using detailed field measurements and point-counting of thin sections. The 35 m long section is located in the Northern Calcareous Alps of Austria. Six point-count groups were distinguished separating basinal from platform-derived input. Summary statistics, cluster and correspondence analysis of the point-count data reveals a close relationship between the biota present on the Dachstein carbonate platform and the calciturbidite composition. The variations in turbidite composition are attributed to fluctuations in sea level and resulting flooding and exposure of the platform, which alternately created and destroyed shallow-water habitats on the platform top.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-3091.1991.tb00371.x
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  • 4
    Electronic Resource
    Electronic Resource
    Primary production in polar waters: relation to nutrient availability (1991)
    Oxford, UK : Blackwell Publishing Ltd
    Polar research 10 (1991), S. 0 
    Details
    ISSN: 1751-8369
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geography , Geosciences
    Notes: Temperature, light and dissolved nutrients are considered the “master” abiotic properties controlling primary production in the ocean. Each of these properties, in turn, is influenced by water column stability Sustained research over the past several decades has endeavored to ascertain which of these properties is most important in regulating phytoplankton growth. In no region has this research effort been more evident than at high latitudes. For both polar regions, extremes in each of these properties is the rule in surface waters where phytoplankton grow: the lowest ocean temperatures, the greatest seasonal excursion in incident solar radiation, and the highest dissolved nutrient concentrations.Based largely on indirect evidence, early researchers speculated that polar primary production was high relative to production at lower latitudes. This was commonly attributed to the abundant surface “macronutrients” (NO3, PO4, H4SiO4) since physiological adaptations to the suboptimum temperatures and light were thought to characterise these high latitude populations. Intensification of polar research since the late 1960's has in many respects modified this view. Current perspectives are that important differences exist between the Arctic and Antarctic with regard to the availability and role nutrients play in regulating primary production. In general much less emphasis is now placed on the significance of the macronutrients in the Antarctic although there is speculation and some evidence that “micronutrients” (Fe) may be important. Macronutrient availability appears to play a more important, though secondary, role in the Arctic, that of sustaining rather than initiating phytoplankton growth.This paper reviews early, contemporary, and present research addressing the question, “What role does nutrient availability play in the distribution and magnitude of primary production in Arctic and Antarctic waters?” Emphasis is placed on new research on under-ice communities as well as on the historically studied pelagic communities.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1751-8369.1991.tb00637.x
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  • 5
    Electronic Resource
    Electronic Resource
    THE EFFECTS OF MICROSTRUCTURE AND FRACTURE SURFACE ROUGHNESS ON NEAR THRESHOLD FATIGUE CRACK PROPAGATION CHARACTERISTICS OF A TWO-PHASE CAST STAINLESS STEEL (1991)
    Oxford, UK : Blackwell Publishing Ltd
    Fatigue & fracture of engineering materials & structures 14 (1991), S. 0 
    Details
    ISSN: 1460-2695
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: In this study, the effects of stress ratio, microstructure and fracture surface roughness on the fatigue properties of a two-phase cast stainless steel were investigated. This behaviour was examined by means of the fracture mechanics approach and fractography. The fatigue crack growth rate decreased with decreasing stress ratio. The stress ratio markedly influenced the fatigue crack growth rate as ΔK approached the ΔKth value. The roughness of the fracture surface was greater in the as-cast material than in the heat-treated material. Analysis of the crack growth data using ΔKeff showed that the effect of R ratio could be explained but that the effect of microstructure on crack growth rate could not.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1460-2695.1991.tb00702.x
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  • 6
    Electronic Resource
    Electronic Resource
    Receptor Activation and Its Biochemical Consequences in Astrocytes (1991)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 633 (1991), S. 0 
    Details
    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1749-6632.1991.tb15637.x
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  • 7
    Electronic Resource
    Electronic Resource
    A mistaken method for correcting potential bias in genetic testing of common carp, Cyprinus carpio L., and tilapias, Oreochromis spp. (1991)
    Oxford, UK : Blackwell Publishing Ltd
    Aquaculture research 22 (1991), S. 0 
    Details
    ISSN: 1365-2109
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract. The aim of this investigation was to evaluate the phenotypic coefficient of regression of weight gain on initial weight as a correction factor in genetic testing programmes. A correction factor is required in order to remove the biasing effect of variation in initial weight among genetic groups tested, on their weight gain. In a genetic testing programme, involving common carp, Cyprinus carpio L., the environmentally generated coefficient of regression of weight gain on initial weight was used as a correction factor. It was estimated with the aid of the‘multiple nursing technique'. In other genetic testing programmes, not accompanied by multiple nursing, the phenotypic regression coefficient of weight gain on initial weight was used as a correction factor. These factors were compared by computing a series of each coefficientfrom a data set, consisting of the results of 10 yearly experiments and including 21 different experimental treatments. The results of this analysis showed that the phenotypic regression coefficient generated unreliable and often inflated estimates of the correction factor, relative to the estimate generated from multiple nursing, which we regard as reliable. Adequate genetic testing programmes therefore need to be accompanied by multiple nursing, unless test progenies are stocked at identical weights.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2109.1991.tb00520.x
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  • 8
    Electronic Resource
    Electronic Resource
    Correlation between condition factor and total lipid content in Atlantic salmon, Salmo salar L., parr (1991)
    Oxford, UK : Blackwell Publishing Ltd
    Aquaculture research 22 (1991), S. 0 
    Details
    ISSN: 1365-2109
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract. A strong and significant positive correlation was observed between condition factor and total lipid content in immature Atlantic salmon, Salmo salar L., parr (0+) sampled at the same time. Condition factor can thus be used as a convenient non-lethal indicator of energy reserve status among immature salmonids.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2109.1991.tb00766.x
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  • 9
    Electronic Resource
    Electronic Resource
    Analysis of Shear and Thermal History During Co-Rotating Twin-Screw Extrusion (1991)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 56 (1991), S. 0 
    Details
    ISSN: 1750-3841
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: A computation procedure was developed for calculating contributions of frictional and viscous heat generation during co-rotating twin-screw extrusion. Application of energy balance to experimental data (mechanical energy input, feed rate, feed moisture, screw speed, die pressure, barrel wall and dough temperature profiles) indicated how conditions affected fill, filled length, shear and thermal energy inputs to the foods. Kneading blocks increased degree of fill in partially filled sections, and dissipated 4–6 times more viscous heat than conveying elements in completely filled sections. Energy input profiles along extruder screw axis clearly demonstrated how heat generation from shear and heat transfer between extruder and foods influenced total energy input.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2621.1991.tb05317.x
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  • 10
    Electronic Resource
    Electronic Resource
    Kinetics of NH4+ and K+ uptake by ectomycorrhizal fungi. Effect of NH4+ on K+ uptake (1991)
    Oxford, UK : Blackwell Publishing Ltd
    Physiologia plantarum 83 (1991), S. 0 
    Details
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: NH4+ and K+ uptake experiments have been conducted with 3 ectomycorrhizal fungi, originating from Douglas fir (Pseudotsuga menziesii (Mirb.] Franco) stands. At concentrations up to 250 μM, uptake of both NH4+ and K+ follow Michaelis-Menten kinetics. Laccaria bicolor (Maire) P. D. Orton, Lactarius rufus (Scop.) Fr. and Lactarius hepaticus Plowr. ap. Boud. exhibit Km values for NH4+ uptake of 6, 35, and 55 μM, respectively, and Km values for K+ uptake of 24, 18, and 96 μM, respectively. Addition of 100 μM NH4+ raises the Km of K+ uptake by L. bicolor to 35 μM, while the Vmax remains unchanged. It is argued that the increase of Km is possibly caused by depolarization of the plasma membrane. It is not due to a competitive inhibition of K+ by NH4+ since the apparent inhibitor constant is much higher than the Km, for NH4+ uptake. The possibility that NH4+ and K+ are taken up by the same carrier can be excluded. The Km, values for K+ uptake in the two other fungi are not significantly affected by 100 μM NH4+. Except for a direct effect of NH4+ on influx of K+ into the cells, there may also be an indirect effect after prolonged incubation of the cells in the presence of 100 μM NH4+.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1399-3054.1991.tb00116.x
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