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  • 1
    Electronic Resource
    Electronic Resource
    A variational calculus approach to the suspension flow problem using the minimal force hypothesis (1982)
    Springer
    Bulletin of mathematical biology 44 (1982), S. 153-174 
    Details
    ISSN: 1522-9602
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Mathematics
    Notes: Abstract Analytic expressions for the velocity profile and distribution of neutrally buoyant particles in laminar flow were obtained as functions of the radial distance. A modified Einstein viscosity model and the hypothesis that the total force on all the particles flowing in the tube is a minimum were used. The methods of the variational calculus were used in the mathematical development. A velocity profile differing only slightly from the parabolic form of that for Hagan-Poiseuille flow was obtained. For particle distribution the equations developed predict a maximum concentration along the center-line for some flows and a maximum concentration in a ring some distance from the center line in other flows. Both of these concentration profiles have been observed experimentally. Quantitative predictions from the equations derived must await further experimental work to permit calculation of the parameters included in the equations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02463245
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  • 2
    Electronic Resource
    Electronic Resource
    Variations in growth and reproduction within populations of two rhizomatous plant species: Typha latifolia and Typha angustifolia (1982)
    Springer
    Oecologia 53 (1982), S. 258-263 
    Details
    ISSN: 1432-1939
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Seasonal excavations of ramet systems in overlapping natural populations of Typha latifolia and T. angustifolia revealed intrapopulation variation in ramet size and reproduction. Reproductive “states” were recognized based on whether or not a ramet had flowered and the number of offspring ramets it possessed. As the growing season progressed, the populations became increasingly heterogeneous in their reproductive-state composition with the largest size classes of ramets containing the greatest number of reproductive states. Therefore, despite a strong correlation between size and reproduction, average ramet size was considered to be an inadequate predictor of population growth in ramet numbers. Results for vegetative reproduction and ramet mortality indicate that the T. latifolia population was growing while the T. angustifolia population was approximately stable. In contrast to most results reported for other species, the frequency distributions of ramet size classes showed T. angustifolia to have a normally distributed population. A slight degree of positive skewing occurred in T. latifolia with the greatest skewing at the end of the growing season. Despite the lack of strong skewing of ramet weights, evidence from other sources have demonstrated that competition was intense and we hypothesize that competition in clonal populations may not not always act to cause positive skew in weight distributions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00545674
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  • 3
    Electronic Resource
    Electronic Resource
    Effects of size and growth rate on vegetative reproduction in Typha (1981)
    Springer
    Oecologia 50 (1981), S. 158-161 
    Details
    ISSN: 1432-1939
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The objective of this study was to separate the effects of plant biomass and growth rate on vegetative reproduction in two species of cat-tail, Typha latifolia and T. angustifolia. Replicate clones of both species were grown under conditions of 100%, 42%, 24%, and 9% full sunlight with harvests at 41, 70, and 91 days after shading. T. angustifolia produced most of its vegetative offspring before the first harvest and increased biomass over the remainder of the experiment by increasing the size of its ramets. In contrast, T. latifolia produced vegetative offspring gradually throughout the experiment adding new ramets only after existing clones were of mature size. As a result of these differences in the cloning process, T. angustifolia showed little correlation between vegetative reproduction and clone size while T. latifolia showed a strong correlation between gegetative reproduction and clone size at the three highest light intensities. Growth rates, average clone size and vegetative reproduction were all reduced by reductions in light intensity for both species. However, no effect of growth rate on the relationship between clone size and vegetative reproduction in T. latifolia could be detected. T. latifolia showed greater survivorship and more biomass production under 9% light than T. angustifolia indicating a greater shade tolerance.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00348030
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  • 4
    Electronic Resource
    Electronic Resource
    Congresses (1981)
    Springer
    Aquatic ecology 15 (1981), S. 94-95 
    Details
    ISSN: 1573-5125
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02260265
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  • 5
    Electronic Resource
    Electronic Resource
    Mechanisms of serotonin involvement in conditioned reflex consolidation (1983)
    Springer
    Neuroscience and behavioral physiology 13 (1983), S. 197-201 
    Details
    ISSN: 1573-899X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Conclusions 1. Intrahippocampal injection of 5 μg serotonin into rats immediately after defensive conditioning leads to the development of retrograde amnesia. Injection of the same dose of serotonin inhibits incorporation of [3H]leucine into hippocampal proteins. An increase in the dose of serotonin injected to 10 μg has no effect on consolidation of conditioned reflexes once formed or on protein synthesis in the hippocampus. 2. Addition of serotonin to the incubation medium containing surviving hippocampal slices leads to a decrease in the incorporation of [14C]leucine and an increase in the incorporation of [3H]fucose into total proteins of the hippocampal slices. The most profound inhibition of incorporation of [14C]leucine into hippocampal proteins is observed by the action of maximal and minimal serotonin concentrations. 3. These results suggest that the participation of serotonin in the consolidation process is connected with its regulatory role in protein metabolism in the hippocampus.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01148850
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  • 6
    Electronic Resource
    Electronic Resource
    A bioassay study of effects of zooplankton, iron and NTA on the phytoplankton productivity of a marl lake (1980)
    Springer
    Hydrobiologia 68 (1980), S. 235-241 
    Details
    ISSN: 1573-5117
    Keywords: phytoplankton productivity ; iron ; zooplankton grazing ; bioassay ; marl lakes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Additions of iron and NTA had minor stimulatory effects on the phytoplankton productivity of samples of water from two calcareous Michigan lakes in autumn and winter contrary to effects at other seasons. Added Daphnia pulex significantly reduced phytoplankton productivity by grazing at this time of year, in all tests at all levels of addition from 4–32 animals/l, greatly in excess of any possible beneficial effects of increased nutrient availability.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00018832
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  • 7
    Electronic Resource
    Electronic Resource
    Order α 2 s massive quark contribution to the vacuum polarization of massles quarks (1981)
    Springer
    The European physical journal 11 (1981), S. 113-115 
    Details
    ISSN: 1434-6052
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We calculate to order α 2 s in the QCD coupling the effect of massive quarks on the vacuum polarization of massless quarks both in a momentum subtraction scheme and in the (modified) minimal subtraction scheme. We also illustrate how decoupling of heavy quarks takes place in this context in the minimal subtraction scheme.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01573992
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  • 8
    Electronic Resource
    Electronic Resource
    The hadronic contribution to theW andZ mass (1981)
    Springer
    The European physical journal 11 (1981), S. 117-120 
    Details
    ISSN: 1434-6052
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract In the framework of the standard model of weak interactions, we discuss the hadronic contribution in the radiative correction to the masses of theW andZ boson. Predictions including the nonhadronic parts are given.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01573993
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  • 9
    Electronic Resource
    Electronic Resource
    Mode-coupling theory of quadrupolar relaxation rate in liquids (1981)
    Springer
    Hyperfine interactions 10 (1981), S. 1035-1039 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01022051
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  • 10
    Electronic Resource
    Electronic Resource
    Buchbesprechungen (1980)
    Springer
    Mathematical methods of operations research 24 (1980), S. B129 
    Details
    ISSN: 1432-5217
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Economics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01917294
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