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  • 1
    Electronic Resource
    Electronic Resource
    δ13C-variations of leaves in forests as an indication of reassimilated CO2 from the soil (1985)
    Springer
    Oecologia 65 (1985), S. 536-542 
    Details
    ISSN: 1432-1939
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary An attempt has been made to evaluate the contribution of soil respired CO2 to the total assimilation of a forest tree, by heeding the 13C-concentrations of CO2 from the free atmosphere and from mineralization processes within the soil respectively. An expression has been derived, according to which the assimilated fraction of CO2 from the soil at a particular height of a tree is given by the δ13C-value of the corresponding leaves, δ13C of atmospheric CO2, δ13C of soil respired CO2 and the physiological state of the leaves expressed as the ratio of total respiration over gross photosynthesis and internal over external CO2-concentration. In the particular case investigated, a δ13C-difference of 5‰ has been determined from bottom to top of a beech tree which results in a CO2 contribution from the soil of about 22% for the lower forest strata, while the total contribution of soil respired CO2 accounts for about 5% of the overall assimilation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00379669
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  • 2
    Electronic Resource
    Electronic Resource
    The effect of various experimental treatments on the development of the embryo of the fernThelypteris palustris (1959)
    Springer
    Planta 54 (1959), S. 1-14 
    Details
    ISSN: 1432-2048
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01916146
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  • 3
    Electronic Resource
    Electronic Resource
    The synthesis and distribution of ribonucleic acid in developing archegonia of Pteridium aquilinum (1971)
    Springer
    Planta 101 (1971), S. 76-87 
    Details
    ISSN: 1432-2048
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summay Feeding gametophytes of Pteridium aquilinum with tritiated uridine, followed by autoradiography, revealed two waves of incorporation of the nucleoside into nuclei during oognesis. The first, affecting the nucleus of the primary cell of the archegonium, is interpreted as indicating the activation of the genes initiating oogenesis. The second, seen in the nucleus of the maturing egg, is believed to be concerned with the differentiation of the egg itself. The results of the autoradiography, corroborated by enzyme digestion and fluorescence microscopy, also demonstrated a high concentration of ribonucleic acid towards the periphery of the mature egg, some possibly located in nucleolus-like bodies found only in this region of the cytoplasm. It is suggested that part of this cytoplasmic ribonucleic acid may represent genetic information remaining untranslated until after fertilization. No evidence was found of any asymmetry in the distribution of the ribonucleic acid in mature eggs which might account for the polarity of developing zygotes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00387692
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  • 4
    Electronic Resource
    Electronic Resource
    The effect of thiouracil on the viability of eggs and embryogeny in Pteridium aquilinum (1972)
    Springer
    Planta 102 (1972), S. 206-214 
    Details
    ISSN: 1432-2048
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Gametophytes of Pteridium aquilinum fed for six days with 50 and 75 p.p.m. thiouracil ceased to produce archegonia, but archegonia already initiated completed their development. Eggs produced in the presence of 50 p.p.m. thiouracil were viable, but embryogenesis was retarded. Gametophytes fed with 75 p.p.m. thiouracil mostly remained barren after insemination, the eggs being inviable, but others produced outgrowths from the archegoniate region which were either gametophytic, or sporophytic with a tendency to revert morphologically and functionally to gametophytic tissue. Thiouracil administered after fertilization either prevented embryogenesis, or retarded it, the sporophytes then being deformed and often showing a tendency to produce gametophytic tissue. The embryo became less sensitive to short periods of thiouracil as it developed, possibly because of the appearance of relatively quiescent regions, serving as reservoirs of unaffected cells. The results are held to support the view that the genes responsible for sporophytic growth become activated during oogenesis, and that the cytoplasm of the mature egg already contains the information leading to this kind of growth.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00386891
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  • 5
    Electronic Resource
    Electronic Resource
    Air pollution monitoring at the Environmental Specimen Bank of Germany: spruce and pine shoots as bioindicators (1996)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 354 (1996), S. 511-514 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract An investigation has been carried out to study the pattern of heavy metal abundance in buds, needles, twigs and cones from single trees and to compare the results with the integrated (composite, homogenized) ESB material of the same origin. It has been evident that (i) pine and spruce shoots are comparable in terms of the pattern of trace element abundance with the exception of Ni, Ba, Sr and Pb, (ii) twigs contribute substantially to the overall concentration of the homogeneous material, and (iii) heavy metal concentrations are remarkably different in samples from remote and industrialized sampling sites. To distinguish the influence of soil at different sampling sites on the overall concentration levels, an extensive investigation using chemometrical data evaluation has still to be carried out.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s0021663540511
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  • 6
    Electronic Resource
    Electronic Resource
    Elemental concentrations in a tropical montane rain forest in Sri Lanka (1992)
    Springer
    Plant ecology 98 (1992), S. 73-81 
    Details
    ISSN: 1573-5052
    Keywords: Elemental concentrations ; Nutrients ; Tropical montane forest ; Sri Lanka
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract As a preliminary to studies on biogeochemistry of a tropical montane rain forest at about 1800 m altitude in Sri Lanka, the concentrations of 17 chemical elements in different forest compartments, i.e. in leaves of six floristically dominant tree species, undergrowth, litter, and soil at 0–10 cm and 11–60 cm depth were determined. Foliar chemical differences between species were large. Mean leaf water content, mean leaf area per leaf, and specific leaf weight of each species were also determined. Calcium seems to be used in relatively large quantities by these plants. Phosphorus concentration in all compartments was consistently low. A few species investigated appeared to concentrate aluminium and silicon at high amounts. Concentration differences between compartments were significant only for certain elements. Location effect on the concentrations in soil was considerable for most of the elements studied. When studying plant-soil chemical interactions in these forests, species-level concentrations must be taken into account as the species-specific chemical differences are obscured when treated as canopy leaves.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00031638
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  • 7
    Electronic Resource
    Electronic Resource
    Multi-laboratory chemical characterization of ecological samples (1989)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 334 (1989), S. 226-230 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary The influence of high concentrations of sodium (Na), chlorine (Cl) and bromine (Br) on the analytical results obtained by means of several modern analytical methods by different laboratories was investigated. The results obtained for the halophytic plants, Aster tripolium and Rhizophora mangle, were compared with that of NBS-Citrus leaves (NBS 1572). With a few outliers no considerable “interference effects” from Na, Cl and Br on the results of other elements were found.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00497246
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  • 8
    Electronic Resource
    Electronic Resource
    Interelement relationships in leaves of tropical montane trees (1993)
    Springer
    Plant ecology 109 (1993), S. 145-151 
    Details
    ISSN: 1573-5052
    Keywords: Elemental relationships ; Interelement relationships ; Mineral elements ; Nutrients ; Sri Lanka ; Tropical montane trees
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Chemical concentrations in leaves are reported for 14 elements in 6 tree species of a montane rain forest in Sri Lanka. The plant taxa varied greatly in chemistry and a few taxa appeared to concentrate several elements in high amounts. The chemical variability among taxonomic units was examined by comparing element-by-element concentration ratios in leaves. Several species seemed to have typical patterns of concentration ratios for certain elements and the interelement relationships of different species seemed to be repeated across varying habitat conditions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00044746
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  • 9
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    Multi-laboratory chemical characterization of ecological samples (1989)
    Springer
    Details
    Publication Date: 1989-03-01
    Print ISSN: 0016-1152
    Topics: Chemistry and Pharmacology
    Published by Springer
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  • 10
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    Air pollution monitoring at the Environmental Specimen Bank of Germany: spruce and pine shoots as bioindicators (1996)
    Springer
    Details
    Publication Date: 1996-03-01
    Print ISSN: 1618-2642
    Electronic ISSN: 1618-2650
    Topics: Chemistry and Pharmacology
    Published by Springer
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