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  • 1990-1994  (1)
  • 1980-1984  (3)
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Year
  • 1
    Electronic Resource
    Electronic Resource
    Characterization of Langmuir-Blodgett Multilayers Using a QuartzCrystal Microbalance: Estimation of Molecular Area and Ionization (1994)
    s.l. : American Chemical Society
    Langmuir 10 (1994), S. 1524-1527 
    Details
    ISSN: 1520-5827
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/la00017a033
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Cleistogamy in Grasses (1983)
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Ecology, Evolution, and Systematics 14 (1983), S. 411-441 
    Details
    ISSN: 0066-4162
    Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1146/annurev.es.14.110183.002211
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Amphicarpum purshii and the “pessimistic strategy” in amphicarpic annuals with subterranean fruit (1982)
    Springer
    Oecologia 52 (1982), S. 327-332 
    Details
    ISSN: 1432-1939
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Amphicarpum purshii Kunth is an annual amphicarpic grass of recently disturbed sandy areas in the Coastal Plain of eastern North America, producing small aerial and larger subterranean seeds. At study sites on the eastern edge of the Pine Barrens of New Jersey, the temporal aspects of reproductive allocation were investigated through biweekly whole-plant field harvests of 25 plants each throughout the 1980 growing season, and the survivorship of plants arising from aerial and subterranean seeds was monitored in a total of 10 high and 10 low density quadrats at two sites differeing in soil moisture. Plants arising from subterranean propagules began to allocate early (July 16) considerable energy to subterranean reproduction (ca 40% of whole-plant dry weight by the last half of August); allocation to aerial culms and flowers did not begin until mid-August and never exceeded 3% on a population basis. Plants arising from aerial propagules (“aerial plants”) produced only subterranean flowers, and these flowers first appeared 2 wk later than they did on “subterranean plants.” Survivorship was greater for the subterranean seedlings at both the dry and wet sites and at low and high densities, and aerial plants showed significantly less total growth and seed production than subterranean plants. The “pessimistic strategy” (early allocation of energy to large subterranean propagules) in the annual Amphicarpum has its selective basis in the relative vigor, survival, and timing and amount of reproduction of the two types of seedlings, and appears comparable to the allocation strategies of at least eight other amphicarpic annuals in at least five other families of plants.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00367955
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    The shift in aerial/subterranean fruit ratio in Amphicarpum purshii: causes and significance (1983)
    Springer
    Oecologia 57 (1983), S. 374-379 
    Details
    ISSN: 1432-1939
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Amphicarpum purshii Kunth, an annual grass, produces both small aerial and larger subterranean seeds, and previous research has indicated that the ratio of the number of viable aerial seeds to the number of viable subterranean seeds decreases with secondary succession and/or the lack of frequent disturbance. The objective of this research was to determine if increasing density and/or greater seed depth could produce this shift in reproductive allocation. Plants arising from aerial and subterranean seeds were grown in pure and mixed cultures at varying densities in a greenhouse to note the effects of intraspecific competition on biomass allocation. In addition, subterranean seeds were sown at varying depths to note the effects of seed depth. Results showed that the growth of plants from aerial seeds was severely depressed in mixtures of plants from the two types of seeds. Increasing density in both pure and mixed cultures led to drastic decreases in allocation to aerial seeds, but the percentage allocation to subterranean seeds was not significantly reduced. Greater seed depth led to decreased emergence rates and increased percentage allocation to subterrancean seeds. It is suggested that as secondary succession progresses, A. purshii and other plants increase in abundance, and the increasing density and the deeper burial of subterrranean seeds result in plants producing mostly subterranean seeds which accumulate in the soil seed bank. These strongly indurate propagules remain viable following the disappearance of Amphicarpum plants in secondary succession and can give rise to “instant populations” upon subsequent vegetation removal and/or soil disturbance.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00377183
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    Paper (German National Licenses)
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