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  • 1
    Electronic Resource
    Electronic Resource
    Belowground productivity of two cool desert communities (1974)
    Springer
    Oecologia 17 (1974), S. 123-130 
    Details
    ISSN: 1432-1939
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary A new technique based upon the dilution of C 14 /C 12 ratios in structural carbon of root systems during the course of the growing season was used to evaluate belowground turnover or productivity of two cool desert communities in northern Utah, USA. This technique provides a measure of turnover of the root system of established perennial plant communities avoiding many of the disadvantages of other techniques. Adjacent communities dominated by Atriplex confertifolia and Ceratoides lanata both exhibited belowground productivity values exceeding aboveground production by three-fold. The greater belowground turnover of the Atriplex-dominated community may be a factor contributing to the maintenance of a greater quantity of aboveground biomass and prolonged periods of active photosynthesis during the driest portions of the year when Ceratoides becomes largely photosynthetically inactive.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00346275
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  • 2
    Electronic Resource
    Electronic Resource
    Mineral ion composition and osmotic relations of Atriplex confertifolia and Eurotia lanata (1972)
    Springer
    Oecologia 11 (1972), S. 67-78 
    Details
    ISSN: 1432-1939
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Periodic collections of Atriplex confertifolia and Eurotia lanata leaf tissue throughout the growing season were analyzed for osmotic potential, water content, and concentration of Na+, K+, soluble Ca++, Cl-, and SO4 -- ions. Ionic concentrations of these two species exhibited marked similarities to corresponding values for European members of the same genera. Atriplex confertifolia, like many other Atriplex species, behaves as an alkali halophyte and accumulates Na+, while E. lanata appears to favor accumulation of K+ as did its European counterpart, E. ceratoides. The analyses showed a much broader range of tissue moisture contents and osmotic potentials during the season for Atriplex than for Eurotia. The differences in leaf water relations between the two species are possibly related to the greater NaCl accumulation by Atriplex as compared to Eurotia. An apparent advantage exists for Atriplex in prolonging physiological activity and carbon gain in the dry portion of the late summer by NaCl accumulation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00345711
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  • 3
    Electronic Resource
    Electronic Resource
    Mineral ion composition and osmotic relations of Atriplex confertifolia and Eurotia lanata (1973)
    Springer
    Oecologia 12 (1973), S. 88-88 
    Details
    ISSN: 1432-1939
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00345472
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  • 4
    Electronic Resource
    Electronic Resource
    Interspecific aggressive behavior in tropical reef stomatopods and its possible ecological significance (1973)
    Springer
    Oecologia 13 (1973), S. 55-64 
    Details
    ISSN: 1432-1939
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Aggressive behavior may play a role in resource partitioning in two Eniwetok stomatopods Gonodactylus incipiens and Haptosquilla glyptocercus. These animals inhabit cavities in coral rubble which they defend vigorously. H. glyptocercus is the more aggressive species and is more than twice as abundant as G. incipiens in the habitat studied. The latter attains larger sizes and also occurs in habitats where H. glyptocercus is rare or absent. A third rarer species, G. falcatus, is also less aggressive than H. glyptocercus and is found in a different microhabitat.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00379618
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  • 5
    Electronic Resource
    Electronic Resource
    The metabolism of amphetamine in dependent subjects (1973)
    Springer
    European journal of clinical pharmacology 6 (1973), S. 177-180 
    Details
    ISSN: 1432-1041
    Keywords: Amphetamine ; drug dependence ; metabolism ; urine ; man
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Summary The metabolism of (+)-[14C] amphetamine has been studied in two women who had been taking 90–100 mg of Dexedrine ((+)amphetamine sulphate; Smith, Kline & French) daily for several years but who showed no evidence of overt amphetamine toxicity. The urinary metabolites were identified, estimated and compared with the results previously obtained from two drug naive male subjects who had received 20 mg of (±)amphetamine (Caldwellet al., (1972b). The same metabolites were found, but the dependent subjects excreted in 24 h more unchanged amphetamine (about 30% of dose) than the naive subjects (20%). This may be a reflection of the dose, which in dependent subjects was five times that of naive subjects. The dependent subjects excreted in 24 h slightly more norephedrine (2.9, 4.1% of dose) and 4′-hydroxynorephedrine (1.1, 1.6%) than the naive subjects (norephedrine, 2.2, 2.6%; 4′-hydroxynorephedrine, 0.3, 0.4%), but the difference in percentage of dose may not be significant. However, in absolute terms the dependent subjects are producing at least five times as much norephedrines as the naive subjects because of the larger dose.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00558282
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  • 6
    Electronic Resource
    Electronic Resource
    Possible mode of action of a photosynthetic inhibitor produced byPandorina morum (1974)
    Springer
    Archives of microbiology 95 (1974), S. 193-204 
    Details
    ISSN: 1432-072X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The mode of action of the photosynthetic inhibitor produced byPandorina morum was examined by exposingVolvox globator and isolated spinach chloroplasts to a partially purified inhibitor preparation. Oxygen evolution ofVolvox, whole chloroplasts, and broken chloroplasts (-Calvin cycle) was reduced indicating that the substances inhibit the light reactions of photosynthesis. Oxygen evolution studies of other Volvocaceae confirmed the observation thatPandorina morum is not significantly influenced by its own inhibitor. Molecular weight approximation by gel filtration established that the inhibitor has a low, molecular weight (probably below 100 mw).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02451761
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  • 7
    Electronic Resource
    Electronic Resource
    The growth unit of the mould Geotrichum candidum (1973)
    Springer
    Archives of microbiology 88 (1973), S. 1-10 
    Details
    ISSN: 1432-072X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Geotrichum candidum grew filamentously in batch culture. Hyphal fragmentation occurred during growth; mycelial fragments in the early part of the stationary phase had a mean length of 300 to 400 μm. The dry weight, total hyphal length, number of hyphal tips and turbidity of the culture all increased exponentially at about the same specific growth rate. The results suggested, the existence of a functional unit of growth consisting of a hyphal tip associated with a constant mean length of hypha. The hyphal growth unit was defined as the ratio between the total hyphal length and number of hyphal tips in the culture; for G. candidum this unit was about 100 μm long and its length remained constant when the organism's specific growth rate was varied by changes in temperature, carbon source or the incorporation of cycloheximide in the medium.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00408836
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  • 8
    Electronic Resource
    Electronic Resource
    The effect of rainfall on the wind in the surface layer (1972)
    Springer
    Boundary layer meteorology 3 (1972), S. 146-151 
    Details
    ISSN: 1573-1472
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract Raindrops falling into a wind-shear zone do not adjust their horizontal speeds immediately to the new wind. Thus, stresses develop which accelerate the air. The effect of raindrops falling into a layer with a logarithmic wind profile is investigated numerically. We find the adjustment of the wind to this situation to be quite small and only barely detectable, even in heavy rain conditions. The effect on the stress distribution is greater. Stress variations of 10–20 % and greater in the lowest 10 m are possible under certain conditions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02033915
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  • 9
    Electronic Resource
    Electronic Resource
    Genetic variation in the mangrove periwinkle Littorina angulifera (1974)
    Springer
    Marine biology 27 (1974), S. 327-332 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Twenty populatios of Littorina angulifera, inhabiting islands composed of the mangrove tree Rhizophora mangle, were assayed at an esterase locus to determine whether genetic differentiation was associated with distance between populations. It was predicted, on the basis of larval dispersal in this species, that genetic differentiation between populations on islands separated by long distances should be greater than those on islands located near each other. A chi0square test of homogeneity revealed significant differences in esterase gene frequencies among the 20 island populations. However, there was no association of distance between islands and genetic heterogeneity. In addition, a cline in gene frequency was found to be assiciated with latitude. Factors responsible for the observed pattern of heterogeneity at the esterase locus are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00394368
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  • 10
    Electronic Resource
    Electronic Resource
    Separation of migratory from feeding and reproductive behavior inOncopeltus fasciatus (1974)
    Springer
    Journal of comparative physiology 88 (1974), S. 383-394 
    Details
    ISSN: 1432-1351
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Data are presented on the ontogeny of flight, general locomotion, mating, feeding, and oviposition in the milkweed bug,Oncopeltus fasciatus. Activities are segregated into different times of day: flight and oviposition are most likely to occur in the afternoon and feeding and mating are most likely to occur in the evening. Oviposition occurs after flight in the life cycle of females, so that the two activities do not conflict. Mating and feeding can and do occur simultaneously. Evidence is presented suggesting that at least feeding and oviposition rhythms involve changing levels of response threshold to external and internal stimuli, supporting Kennedy's hypothesis that migration in insects involves a suppression of “vegetative” activities during migratory flight.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00694701
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