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  • Springer  (80)
  • Oxford University Press
  • 2020-2024  (5)
  • 1975-1979  (75)
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  • 1
    Electronic Resource
    Electronic Resource
    Blood flow: Theory, effective viscosity and effects of particle distribution (1975)
    Springer
    Bulletin of mathematical biology 37 (1975), S. 471-488 
    Details
    ISSN: 1522-9602
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Mathematics
    Notes: Abstract A study is made of blood flow by assuming that the blood constitutes a suspension of cells in plasma instead of a simple homogeneous fluid. A macroscopic theory governing the motion of plasma in a plasma-cell system is derived from the local volume averaging method for a system without mass transfer between the phases, and its characteristic length is much larger than the size of the cells. The equations governing the motion of the local averaged fluid quantities include one additional term in the equation of motion and two additional terms in the energy equation. These terms represent, respectively, the force exerted upon the fluid by the particles, and the rate of heat transfer and work done upon the fluid by the particles. The theory is applied to obtain the effective viscosity as the explicit function of the volume concentration of the cells by assuming that the cells behave like rigid spherical particles with slip-collision, and the plasma is an incompressible Newtonian fluid. Comparison with existing experimental results shows a good agreement. The theory is also used to obtain the effects of cell distribution upon the overall effective viscosity in a circular tube. The quantitative result shows that there is a decrease in overall effective viscosity as the concentration of cells increases toward the center of the tube, and the overall effective viscosity is smaller than the flow with evenly distributed cells.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02459515
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  • 2
    Electronic Resource
    Electronic Resource
    Periodic and traveling wave solutions to Volterra-Lotka equations with diffusion (1976)
    Springer
    Bulletin of mathematical biology 38 (1976), S. 643-658 
    Details
    ISSN: 1522-9602
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Mathematics
    Notes: Abstract Analytic and numerical solutions to two coupled nonlinear diffusion equations are studied. They are the modified equations of Volterra and Lotka for the spatially stratified predatorprey population model. In a bounded domain with the reflecting boundary, equilibrium, stability, and transition to time-periodic solutions are analyzed. For a wide class of initial states, the solutions to the initial boundary-value problem evolve into their corresponding stable, space-homogeneous, periodic oscillations. In an unbounded domain, a family of traveling wave solutions is found for certain exponential, initial distributions in the limit as the diffusion coefficientv 1 of the prey tends to zero. In the presence of both diffusions, the results of a numerical simulation to an initial-value problem showed the rapid formation of the Pursuit-Evasion Waves whose speed of propagation and amplitudes increase with the diffusion coefficientv 1.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02458639
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  • 3
    Electronic Resource
    Electronic Resource
    Remarks on maximal left ideals in semigroups (1976)
    Springer
    Monatshefte für Mathematik 81 (1976), S. 257-260 
    Details
    ISSN: 1436-5081
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract Some similar results to those for maximal (two-sided) ideals in a compact semigroupS are obtained for maximal left ideals inS, with one exception i.e. the intersection of all maximal left ideals inS may be empty. The maximal left ideals in the convolution semigroup of measures onS are also considered.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01387752
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  • 4
    Electronic Resource
    Electronic Resource
    Water, a powerful attractant for the gravid females of Plodia interpunctella and Cadra cautella (1977)
    Springer
    Cellular and molecular life sciences 33 (1977), S. 453-455 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary In the sex pheromone controlling experiments, not only large number of the males of the almond moth and Indian meal moth, but also great number of ovipositional females were caught. The increased catch of the fertilized females was due to the presence of detergent in the water.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01922206
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  • 5
    Electronic Resource
    Electronic Resource
    Interactions among beans in neighboring Faraday cages (1977)
    Springer
    Cellular and molecular life sciences 33 (1977), S. 1316-1318 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Bean seeds, during their initial 4 h of absorption of water while in a Faraday cage, are able to interact mutually with similar absorbing beans in nearby Faraday cages. The interaction effects complementarity of response between adjacent cages to a common, fluctuating environmental factor affecting water uptake.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01920154
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  • 6
    Electronic Resource
    Electronic Resource
    Effect of age upon fatty acid composition of adult Caribbean fruit flies, Anastrepha suspensa (1975)
    Springer
    Entomologia experimentalis et applicata 18 (1975), S. 515-517 
    Details
    ISSN: 1570-7458
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00304656
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  • 7
    Electronic Resource
    Electronic Resource
    Comparative studies on the metabolism of shallow-water and deep-sea marine fishes. IV. Patterns of aerobic metabolism in the mesopelagic deep-sea fangtooth fish Anoplogaster cornuta (1976)
    Springer
    Marine biology 35 (1976), S. 287-293 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Measurements have been made of oxygen consumption rates $$\dot v$$ O2 of 10 specimens of the mesopelagic deep-sea fangtooth fish Anoplogaster cornuta. Determinations were made at 1 atm pressure, at temperatures of 3°, 7°, and 10°C, at dissolved oxygen concentrations ranging from near saturation to zero, with the fish swimming at low, controlled speeds. Weight-specific $$\dot v$$ O2 were uniformly low. They showed Q10's of 2.5 and 1.3, respectively, in the temperature ranges 3° to 7°C, and 7° to 10°C, at dissolved oxygen concentrations above 2 ml (standard temperature and presusure, STP)/1. Measurable $$\dot v$$ O2 continued in these fish at dissolved oxygen concentrations down to the lowest levels detectable with our instruments. At 7°C the average critical oxygen tension (P c ) for the entire group was near 35 mm Hg. However, there is a statistically significant positive slope to the regression line relating $$\dot v$$ O2 to P c for individual fish. The physiological and ecological significance of these results is discussed, particularly with reference to thermal effects and to the basis for survival by A. cornuta in the oxygen minimum layers of the eastern Pacific Ocean.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00396876
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  • 8
    Electronic Resource
    Electronic Resource
    Applications of generic bifurcation. I (1975)
    Springer
    Archive for rational mechanics and analysis 59 (1975), S. 159-188 
    Details
    ISSN: 1432-0673
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00249688
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  • 9
    Electronic Resource
    Electronic Resource
    Applications of generic bifurcation. II (1976)
    Springer
    Archive for rational mechanics and analysis 62 (1976), S. 209-235 
    Details
    ISSN: 1432-0673
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00280015
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  • 10
    Electronic Resource
    Electronic Resource
    Lead accumulation rates in tissues of the estuarine teleost fish,Gillichthys mirabilis: Salinity and temperature effects (1977)
    Springer
    Archives of environmental contamination and toxicology 6 (1977), S. 337-348 
    Details
    ISSN: 1432-0703
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Medicine
    Notes: Abstract Tissue-specific lead accumulation rates were determined in the estuarine teleost fish,Gillichthys mirabilis, as a function of four variables; sea water lead concentration, duration of exposure to lead, salinity, and temperature. Distinct tissue-specific accumulation rates were found. Spleen, gills, fins, and intestine accumulated the greatest amounts of lead; liver and muscle accumulated the least lead. Decay of lead from tissues of lead-exposed fish was observed only for gills, fins, and intestine, tissues which all possess an outer or inner covering of mucus. Our data suggest that the rapid turnover of lead in these mucus-covered tissues is a result of lead complexing with mucus and subsequent loss of lead when the mucus layer is sloughed off. In spleen and vertebrae, lead levels continued to rise in fish returned to natural (unspiked) sea water from lead-spiked sea water. The rate of lead accumulation was dependent on both the holding salinity and the temperature. Fish held at high temperature accumulated lead more rapidly than fish held at low temperature. The rate of lead accumulation was inversely proportional to the salinity of the medium. Both of these environmental effects on lead accumulation rates could be significant in estuarine habitats where lead concentrations, salinity, and temperature are all apt to vary seasonally.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02097774
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