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  • 1
    Electronic Resource
    Electronic Resource
    Determination of Aromatic Aldehydes by Near-Infrared Spectrophotometry (1960)
    s.l. : American Chemical Society
    Analytical chemistry 32 (1960), S. 1287-1289 
    Details
    ISSN: 1520-6882
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ac60166a016
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  • 2
    Electronic Resource
    Electronic Resource
    The Shapes and Sizes of Seeds (1970)
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Ecology, Evolution, and Systematics 1 (1970), S. 327-356 
    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.01.110170.001551
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  • 3
    Electronic Resource
    Electronic Resource
    The Demography of Plants (1974)
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Ecology, Evolution, and Systematics 5 (1974), S. 419-463 
    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.05.110174.002223
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  • 4
    Electronic Resource
    Electronic Resource
    SEED POLYMORPHISM AND GERMINATION (1965)
    Oxford, UK : Blackwell Publishing Ltd
    Weed research 5 (1965), S. 0 
    Details
    ISSN: 1365-3180
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary. Achenes of Chenopodium album are polymorphic; four categories can be recognized visually, brown-smooth, brown-reticulate, black-smooth and black-reticulate. All four types may be borne by one plant. The polymorphic seeds differ in germination requirements, responding differently to chilling and nitrate application.Dormant seeds contain at least one extractable germination inhibitor. The inhibitor fails to act in the presence of added nitrate.Nitrate is replaceable by some other nitrogen compounds and by chlorate. Nitrate application stimulates germination of C. album in soil.The ecological significance of seed polymorphism and the relevance of polymorphism to the interpretation of germination tests are briefly discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-3180.1965.tb00337.x
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  • 5
    Electronic Resource
    Electronic Resource
    Panglossian botany (1982)
    [s.l.] : Nature Publishing Group
    Nature 295 (1982), S. 470-470 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Physiological Plant Ecology, 2nd Edn. By W. Larcher. Pp.303. ISBN0-387-09795-3. (Springer-Verlag: 1980.) DM59, $34.90. Environmental Physiology of Plants. By A.H. Fitter and R.K.M. Hay. Pp.355. Hbk ISBN 0-12-257760-4; pbk ISBN 0-12-257762-0. (Academic: 1981.) Hbk £19.60, $47.50; ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/295470a0
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  • 6
    Electronic Resource
    Electronic Resource
    Contribution to reproductive effort by photosynthesis of flowers and fruits (1979)
    [s.l.] : Nature Publishing Group
    Nature 279 (1979), S. 554-555 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Inflorescences, flowers or fruits with a 3-5-cm piece of stem were excised from plants, sealed in vials containing water, and the rate of CO2 exchange of the inflorescence was determined, first in the light (700 ? m2 s"1) and then in the dark (1 ? m 2 s *) (rf. 7). Carbon dioxide exchange was ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/279554a0
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  • 7
    Electronic Resource
    Electronic Resource
    Angiospermous Hemiparasites (1965)
    [s.l.] : Nature Publishing Group
    Nature 205 (1965), S. 722-723 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Koch1, Ewart2, Kostytsehew3 and Heinricher4 maintained that the heraiparasites obtain only water and mineral nutrients from a host plant. Bonnier5 showed that the hemiparasites have only a weak photosynthetic activity and claimed that these plants are dependent on the host for a supply of ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/205722a0
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  • 8
    Electronic Resource
    Electronic Resource
    Control of fecundity through abortion in Epilobium montanum L. (1987)
    Springer
    Oecologia 74 (1987), S. 31-38 
    Details
    ISSN: 1432-1939
    Keywords: Fecundity-perennial herb ; Flower bud abortion ; Seed survivorship ; Inbreeding ; Epilobium montanum
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Plants of the inbreeding perennial herb Epilobium montanum L. were defoliated at two stages in development and the formation and abortion of flower buds, flowers, copsules and ovules was compared with control plants. A comparison was also made of the effects of self- and cross-pollination on fecundily. Defoliation reduced the number of flower buds formed but its greatest effect was to increase the abortion of flower buds. Defoliation also caused earlier abortions which were generally lower on the racemes of the treated than on the control plants. The abortion of flowers and capsules was much less significant. The number of ovules formed per capsule decreased with height on the raceme and the abortion rate of ovules was increased by defoliation. The pattern of ovule abortion within the capsules differed between cross- and self-pollinated plants but the number of seeds ripened was not affected. The overall survivorship of ovules to mature seeds was 89.3% which compares with the average of 85% found by Wiens for inbreeding annuals. The findings suggest that such high values of ovule survivorship may be characteristics of normally inbreeding species irrespective of whether they are annuals or perennials.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00377342
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  • 9
    Electronic Resource
    Electronic Resource
    The effect of canopy filtered light on the growth of white clover Trifolium repens (1987)
    Springer
    Oecologia 72 (1987), S. 372-376 
    Details
    ISSN: 1432-1939
    Keywords: High quality ; shade ; Photomorphogenesis ; Canopy filtered light ; Trifolium repens
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Plants of white clover (Trifolium repens) were grown under canopies of clover leaves floating on shallow glass tanks of water and their growth was compared with that of plants under canopies of black polythene ‘leaves’. The experimental design allowed the growth of the clover plants in canopy filtered light to be compared with that in unfiltered light at different intensities of Photosynthetically Active Radiation (P.A.R.). The effect of canopy filtered light was to exaggerate the effects of reduced P.A.R. especially in promoting petiole extension and inhibiting stolon branching. Two clones of white clover differed in their responses to P.A.R. and to light quality and there were significant interactions between the effects of the intensity of P.A.R. and type of shade. It is argued that it may be important for both ecologists and plant breeders to recognise the role of radiation quality in regulating the dynamics of pasture.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00377566
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  • 10
    Electronic Resource
    Electronic Resource
    Identification and measurement of methylamines in elasmobranch tissues using proton nuclear magnetic resonance (1H-NMR) spectroscopy (1998)
    Springer
    Journal of comparative physiology 168 (1998), S. 123-131 
    Details
    ISSN: 1432-136X
    Keywords: Key words Methylamines ; Elasmobranchs ; Nuclear magnetic resonance ; Trimethylamine oxide ; Betaine
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract Methylamines are frequently present in high concentrations in biological samples, but their separation and quantification are difficult. Data presented show that methylamines commonly occurring in biological material can be uniquely identified and quantified by proton nuclear magnetic resonance spectroscopy by recording spectra at both neutral and acid pH. Use of a high sensitivity probe permits this analysis even in the presence of high water concentrations, allowing accurate quantification with minimum preparative technique. The method was tested on tissues of the dogfish. Trimethylamine oxide was found in amounts ranging from 42 mmol kg−1 fresh weight in liver, up to 115 mmol kg−1 fresh weight in heart. Betaine was found to range from 10 mmol kg−1 fresh weight in liver to 49 mmol kg−1 fresh weight in brain. Creatine was not found in heart or liver, but was present in body wall muscle and in brain. Further analysis using high-performance liquid chromatography allowed determination of urea/methylamine ratios, which ranged from 1.9 in liver to 3.7 in body wall muscle.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003600050128
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