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  • Articles  (9)
  • Articles: DFG German National Licenses  (9)
  • Physics  (5)
  • Lycopersicon esculentum  (2)
  • Picea abies  (2)
  • 1
    Electronic Resource
    Electronic Resource
    A metabolite of 24-epi-brassinolide in cell suspension cultures of Lycopersicon esculentum
    Amsterdam : Elsevier
    Phytochemistry 36 (1994), S. 319-321 
    Details
    ISSN: 0031-9422
    Keywords: 24-epi-brassinolide. ; Lycopersicon esculentum ; Solanaceae ; cell suspension cultures ; fast atom bombardment mass spectrometry ; glucosylation ; hydroxylation ; long range heteronuclear magnetic resonance spectrometry ; metabolism ; tritium-labelled brassinosteroid
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/S0031-9422(00)97068-7
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Performance of two Picea abies (L.) Karst. stands at different stages of decline (1988)
    Springer
    Oecologia 75 (1988), S. 25-37 
    Details
    ISSN: 1432-1939
    Keywords: Forest decline ; Carbohydrates ; Picea abies ; Growth ; Leaf area index
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary This is the first in a series of papers on the growth, photosynthetic rate, water and nutrient relations, root distribution and mycorrhizal frequency of two Norway spruce forests at different stages of decline. One of the stands was composed of green trees only while the other included trees ranging in appearance from full green crowns to thin crowns with yellow needles. In this paper we compare the growth and carbohydrate relations of the two stands and examine relationships among growth variables in ten plots. The declining stand produced 65 percent of the wood per ground area compared with the stand in which all trees were green because its foliage produced less wood at any level of leaf area index. The difference in foliage efficiency between the sites could not be explained by differeneces in climate, competition or stand structure. The declining stand appeared to have lower carbon gain as indicated by a smaller increase in reserve carbohydrates before bud break, and weaker sinks for carbohydrates as indicated by less use of the stored carbohydrates than the healthy stand. Thus, growth reduction was probably related to factors which affect both photosynthesis and, even more, the sinks for carbohydrate.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00378810
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  • 3
    Electronic Resource
    Electronic Resource
    Performance of two Picea abies (L.) Karst. stands at different stages of decline (1988)
    Springer
    Oecologia 77 (1988), S. 7-13 
    Details
    ISSN: 1432-1939
    Keywords: Forest decline ; Ectomycorrhizas ; Fine roots ; Picea abies
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The development of root tips and apparent ectomycorrhizas was compared in the Fichtelgebirge (FRG) over one growing season in two 30-year-old Picea abies stands, both on soils derived from phyllite but showing varying symptoms of decline. Visual symptoms of tree decline reflected a lower relative and absolute mycorrhizal frequency, a lower number of ectomycorrhizas per m2 leaf area and an uneven vertical distribution of root tips and ectomycorrhizas. The number of apparent ectomycorrhizas per ground area was correlated with the amount of magnesium, calcium, and ammonium, and the pH in the free-drainage soil solution, and with the molar calcium to aluminium ratio in mineral soil extracts. The foliage concentrations of magnesium and calcium were correlated with the numbers of apparent ectomycorrhizas per m2 leaf or ground area. These observations were used to formulate testable hypotheses concerning the role of the root system and the soil environment in forest decline.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00380917
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  • 4
    Electronic Resource
    Electronic Resource
    Characterization and classification of phytoplasmas from wild and cultivated plants by RFLP and sequence analysis of ribosomal DNA (1997)
    Springer
    European journal of plant pathology 103 (1997), S. 675-686 
    Details
    ISSN: 1573-8469
    Keywords: apple proliferation ; aster yellows ; Bunias orientalis ; Cardaria draba ; Cirsium arvense ; clover phyllody ; Convolvulus arvensis ; Conyza canadensis ; Cyclamen persicum ; Daucus carota ssp. sativus ; etiology ; faba bean phyllody ; Gossypium hirsutum ; Lycopersicon esculentum ; Picris echioides ; Portulaca oleracea ; Stellaria media ; stolbur ; Trifolium repens
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Restriction fragment length polymorphism and sequence analysis of PCR-amplified ribosomal DNA were used to identify and classify phytoplasmas associated with diseases of various wild and cultivated plants. The diseases examined were either not known before or the presumable causal agents were not yet identified and characterized or were only known from other geographic areas. New diseases examined were those causing virescence and phyllody of Bunias orientalis and Cardaria draba. Both were associated with strains of the aster yellows phytoplasma. The same type of aster yellows phytoplasma was also found to be associated with yellows and phyllody diseases of Portulaca oleracea, Stellaria media, Daucus carota ssp. sativus, and Cyclamen persicum. In German and French DNA samples from diseased Trifolium repens, the clover phyllody phytoplasma was identified, which could clearly be distinguished from other phytoplasmas of the aster yellows group. Strains of the stolbur phytoplasma were detected in big bud-affected tomatoes and almost exclusively in Convolvulus arvensis. In Cirsium arvense and Picris echioides two distinct phytoplasmas were identified which showed relationship to the sugarcane white leaf phytoplasma group but may represent a new group or subgroup. In Conyza (syn.: Erigeron) canadensis a phytoplasma of the X-disease group was detected. A strain from Gossypium hirsutum showed the same restriction profiles as the faba bean phyllody phytoplasma.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008693314317
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  • 5
    Electronic Resource
    Electronic Resource
    High resolution 1H-NMR relaxation study of polyisobutylene in solution (1976)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Physics Edition 14 (1976), S. 1789-1800 
    Details
    ISSN: 0098-1273
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: From the temperature dependence of integrated intensities and from line widths in high-resolution 1H-NMR spectra, the relaxation times T1 and T2 of protons in CH2 and CH3 groups of polyisobutylene in CCl4 solution have been determined. Although the relaxation time T1 of methylene protons is determined mainly by intragroup interactions, intergroup interactions of two methyl groups from each two consecutive monomer units were found to contribute considerably to T1 of methyl protons. The Structure and mobility of polyisobutylene (PIB) molecules in solution is discussed on the basis of the relaxation time data.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1976.180141005
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  • 6
    Electronic Resource
    Electronic Resource
    NMR spectroscopic, osmometric, and viscometric study of association of syndiotactic poly(methyl methacrylate) in dilute solutions (1982)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Physics Edition 20 (1982), S. 1623-1632 
    Details
    ISSN: 0098-1273
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Association of syndiotactic (s) poly(methyl methacrylates) (PMMAs) in toluene, benzene, and acetonitrile has been studied by NMR spectroscopy, osmometry, and viscometry. It was found that in solutions of highly syndiotactic PMMA in toluene, most of the polymer exists in the associated state. Association takes place by means of stereospecific intermolecular and intramolecular interactions of long parallel syndiotactic sequences. The minimum length of syndiotactic sequences necessary for association of s-PMMA in toluene is 7-8 monomer units. Viscosity data indicate that in dilute solutions the associated structures appear as large formations which do not have the character of compact particles. The formation of the aggregates of PMMA is a relatively slow process. A model of the structure of the aggregates of s-PMMA in toluene is proposed. As compared with that in toluene, the tendency to aggregation in benzene and acetonitrile is negligible. Integral parameters currently used for the characterization of polymer-solvent interaction, like “good” or θ solvent, are not suitable for predicting the tendency of s-PMMA to aggregation. The formation of aggregates evidently has some connection with the effect of the solvent upon the conformational structure of syndiotactic sequences.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1982.180200911
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  • 7
    Electronic Resource
    Electronic Resource
    Study of ordered structures of syndiotactic poly(methyl methacrylate) in solution and in the solid state (1984)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Physics Edition 22 (1984), S. 617-635 
    Details
    ISSN: 0098-1273
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: From analysis of infrared spectra it was found that in syndiotactic (s) poly(methyl methacrylate) (PMMA) in solution, long s sequences contain an increased population of diads with a skeletal conformation tt (in the staggered approximation). Self-aggregation of s-PMMA in solution leads to a further increase of the fraction of long s sequences in the extended chain conformation, and to an ordering of easter groups. When solid s-PMMA is isolated from a solution in which it exists in the aggregated state, these characteristics are preserved in the solid. The polymer appears partially crystalline by x-ray scattering, and it exhibits fibrillar morphology under the electron microscope. Ordered structures of s-PMMA melt at temperatures about 150°C, while the presence of residual solvent decreases the temperature of melting. Solid s-PMMA obtained from solutions in which aggregation of the polymer does not take place, like s-PMMA which did not come into contact with solvent, contains a higher proportion of syndiotactic diads with a skeletal conformation tg; these samples are amorphous and morphologically structureless. Analogies between the structure of ordered s-PMMA and the structure of the PMMA stereocomplex are also discussed.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1984.180220406
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  • 8
    Electronic Resource
    Electronic Resource
    Structure of chlorinated poly(vinyl chloride). II. Distribution of Cl atoms in the polymer chain (1971)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A-1: Polymer Chemistry 9 (1971), S. 2753-2762 
    Details
    ISSN: 0449-296X
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The distribution of chlorine atoms in the chain of solution-chlorinated PVC (CPVC) composed of —CH2—CHCl— (1), —CHCl—CHCl— (2), and —CCl2—CHCl— (3) monomeric units is described by first-order Markoffian statistics based on the assumption that the chlorination mechanism is independent of tacticity. In this case, all the statistical parameters can be obtained from experimentally determined concentrations of CH2, CHCl and CCl2 units. Populations of the sequences (11) and (111) calculated from the statistical parameters agree with experimental values determined from infrared and 220 MHz NMR spectra. From infrared spectra, suspension-chlorinated CPVC contains blocks of intact PVC.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1971.150091001
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  • 9
    Electronic Resource
    Electronic Resource
    Determination of tacticity in poly(vinyl chloride) by infrared spectroscopy (1967)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A-1: Polymer Chemistry 5 (1967), S. 2013-2021 
    Details
    ISSN: 0449-296X
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: From the temperature dependence of infrared spectra of poly(vinyl chloride) samples prepared by different methods, the intensity of the band at 690 cm.1 (proportional to the number of isotactic diads in the sample), as well as that of the tacticity-independent C—H stretching band, was found to be independent of the crystallinity of the sample. These lines were therefore applied for the tacticity determination in poly(vinyl chloride), measured in the form of KBr pellets. The numerical tacticity value was obtained from the known values of absorbance coefficients of SCH and SHH type C—Cl stretching bands in solution, and from the shape of the spectrum.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1967.150050818
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