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  • 1980-1984  (25)
  • 1960-1964  (9)
  • 1945-1949  (3)
  • 1
    Electronic Resource
    Electronic Resource
    STEREOCHEMISTRY OF SUBSTITUTION TO ASYMMETRIC SILICON (1961)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 83 (1961), S. 2210-2212 
    Details
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ja01470a051
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  • 2
    Electronic Resource
    Electronic Resource
    Stereochemistry of Asymmetric Silicon. III. Carboxylate and Tosylate Leaving Groups1 (1964)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 86 (1964), S. 3280-3283 
    Details
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ja01070a016
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  • 3
    Electronic Resource
    Electronic Resource
    Stereochemistry of Asymmetric Silicon. I. Relative and Absolute Configurations of Optically Active α-Naphthylphenylmethylsilanes1 (1964)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 86 (1964), S. 3271-3276 
    Details
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ja01070a014
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  • 4
    Electronic Resource
    Electronic Resource
    Stereochemistry of Asymmetric Silicon. II. Alkoxy and Siloxy Leaving Groups (1964)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 86 (1964), S. 3276-3279 
    Details
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ja01070a015
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  • 5
    Electronic Resource
    Electronic Resource
    Photosynthesis-irradiance responses and photosynthetic periodicity in the sea anemone Aiptasia pulchella and its zooxanthellae (1984)
    Springer
    Marine biology 82 (1984), S. 225-232 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Sea anemones (Aiptasia pulchella) containing zooxanthellae (Symbiodinium microadriaticum) were maintained in a long-term laboratory culture on a 12 h light (100 μE m-2 s-1):12 h dark cycle. Photosynthetic oxygen production was measured for the symbiotic association and for freshlyisolated zooxanthellae. Light utilization efficiencies (α) were similar for both sets of zooxanthellae, suggesting negligible shading of zooxanthellae by animal tissue in this association. Whereas freshly-isolated zooxanthellae were photoinhibited at high irradiances (800 to 1 800 μE m-2 s-1), zooxanthellae in the host continued to function at photosynthetic capacity. Time of day may influence photosynthetic measurements in symbiotic organisms, as it was found that photosynthesis in A. pulchella followed a diel periodicity at both light-saturating (1 200 μE m-2 s-1) and subsaturating (150 μE m-2 s-1) irradiances. There was a peak period of photosynthesis between 12.00 and 14.00 hrs. Light stimulated dark respiration rates of A. pulchella. Dark respiration of sea anemones increased somewhat towards the end of the light cycle and was always greater after exposure to high irradiances.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00392403
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  • 6
    Electronic Resource
    Electronic Resource
    Coronal rotation during solar cycle 20 (1982)
    Springer
    Solar physics 80 (1982), S. 185-198 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Using K-coronameter observations made by the High Altitude Observatory at Haleakala and Mauna Loa, Hawaii during 1964–1976, we determine the apparent recurrence period of white-light solar coronal features as a function of latitude, height, and time. A technique based on maximum entropy spectral analysis is used to produce rotational period estimates from daily K-coronal brightness observations at 1.125R S and 1.5R S from disk center and at angular intervals of 5° around the Sun's limb. Our analysis reaffirms the existence of differential rotation in the corona and describes both its average behavior and its large year-to-year variations. On the average, there is less differential rotation at the greater height. After 1966–1967 we observe a general increase in coronal rotation rate which may relate to similar behavior reported for the equatorial photospheric Doppler rate. However, the coronal rate increase is significantly greater than the photospheric. If K-coronal features reflect the rotation at depth in the Sun, the long-term rate increase and the variable differential rotation may be evidence for dynamically important exchanges of energy and momentum in the upper convection zone.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00153432
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  • 7
    Electronic Resource
    Electronic Resource
    Female choice in widowbirds (1983)
    [s.l.] : Nature Publishing Group
    Nature 302 (1983), S. 456-456 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] FIELD studies of the long-tailed widow-bird, Euplectes progne, by Andersson1 involved experimental manipulation of the tail-lengths of territorial males and measurement of their breeding success in terms of the number of females that nested in the male's territory. The Darwin-Fisher theory2'3 of ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/302456a0
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  • 8
    Electronic Resource
    Electronic Resource
    Dung fly struggles: Evidence for assessment strategy (1981)
    Springer
    Behavioral ecology and sociobiology 8 (1981), S. 219-230 
    Details
    ISSN: 1432-0762
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary 1. Dung fly males guard their females from other males while the female oviposits. Occasionally an attacker grasps the female and a struggle for the possession of female begins. These contests obey ‘war of attrition’ rules. Outcomes and durations of struggles were analysed with respect to the various asymmetries present in the contests, using a technique that tests how the two opponents shift their fighting strategies in accordance with variations in a particular asymmetric feature. 2. In struggles, the attacking male is almost invariably larger than the guarding male (the ‘owner’). Males do not appear to play strategies that are fixed in relation to their own size, but play strategies that depend on their size relative to that of their opponent. No significant difference was found between struggle durations for two small opponents and those for two large opponents, though both were significantly different from large versus small opponents. As the relative size of the owner increases, the persistence of the attacker decreases significantly. That of the owner probably increases (though this is not proven). 3. The female's size relative to the owner's size also exerts a significant effect on the outcome. The larger the female, the greater the probability of takeover. This arises from a greater persistence of the attacker. The ‘resource holding power’ (RHP) of the owner is therefore considered to be influenced both by his size relative to that of the attacker and by his size relative to that of this female. In addition, the owner may have an inherent RHP advantage due to his initial grasp on the female. This may contribute to the fact that only 20–25% of struggles end in takeover despite the fact that the attacker is larger than the owner. 4. Another effect that must contribute to the low frequency of take-overs concerns the fact that the mean value of winning (the resource value) is higher for the owner than for the attacker. Resource value relates mainly to the number of eggs that remain to be laid at the time of the struggle. Though the owner may be unable to monitor this directly, there is a strongly significant negative correlation between owner's persistence and the time he had spent guarding. Thus he escalates as resource value increases. In contrast, attackers appeared to be unable to estimate resource value; their persistence was independent of the female's egg content. 5. The data strongly support the notion that dung flies assess RHP and resource value in contests and alter their fighting strategies accordingly. We discuss the data in relation to recent theoretical developments in the study of assessment strategy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00299834
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  • 9
    Electronic Resource
    Electronic Resource
    Dung fly struggles: A test of the war of attrition (1980)
    Springer
    Behavioral ecology and sociobiology 7 (1980), S. 37-44 
    Details
    ISSN: 1432-0762
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary 1. In Maynard Smith's ‘war of attrition’ model of animal conflict, two identical opponents fight over a unitary resource and the winner is the individual that is prepared to go on longer. The evolutionarily stable strategy (ESS) is for individuals to vary in their selection of ‘bids’ (fighting durations) so that the probability density of bids follows a negative exponential distribution. In nature, the distribution of selected bids cannot be observed directly, because contests are terminated by the opponent with the lower bid. We therefore derive an expected distribution of contest persistence times. 2. Struggles between male dung flies (Scatophaga stercoraria) for possession of a female can be evaluated in terms of Darwinian fitness as expected number of eggs fertilised/time. Fitness calculations must account for the energetic costs of struggling relative to searching for an alternative female; a plausible range of relative energetic costs is deduced. Though there is a superficial concordance of observed struggle persistence times with that predicted from a war of attrition with linear costs, this breaks down when the data are analysed in component categories. Further, dung fly struggles are clearly asymmetric contests. We suggest that struggles are settled by a form of assessment strategy involving acquisition of information during the contest about the relative resource holding powers of the two contestants.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00302516
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  • 10
    Electronic Resource
    Electronic Resource
    Effect of soil Cd addition on germination of native plant species (1980)
    Springer
    Plant and soil 54 (1980), S. 243-247 
    Details
    ISSN: 1573-5036
    Keywords: Andropogon ; Cd ; Germination ; Greenhouse ; Monarda ; Rudbeckia ; Soil
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Soil Cd addition was found to adversely affect germination ofAndropogon scoparius, Monarda fistulosa, andRudbeckia hirta. Rudbeckia germination was found to be most sensitive to soil Cd addition andAndropogon germination most tolerant (b=−.0001). Soil cadmium concentrations sufficient to reduce germination by 25% were calculated to be 30 and 46 μg Cd/g soil forRudbeckia andAndropogon respectively.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02181850
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