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  • 1
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Journal of agricultural and food chemistry 36 (1988), S. 871-871 
    ISSN: 1520-5118
    Source: ACS Legacy Archives
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 276 (1978), S. 842-844 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Table 1 Octopine, nopaline and agropine degradation by A. tumefaciens strains and synthesis by crown gall tumours induced by those strains Bacterial Bacterial degradation* Synthesis in tumour strain Octopine Nopaline Agropine Octopine Nopaline Agropine A6 + - + + - + A66 + - + + - + ...
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1420-9071
    Keywords: Cabbage stem flea beetle ; Psylliodes chrysocephala L. ; oilseed rape ; Brassica napus L. ; glucosinolates
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Infestation of oilseed rape (Brassica napus L.) by the cabbage stem flea beetle (Psylliodes chrysocephala L.) leads to an overall reduction in the levels of aliphatic (alkenyl- and hydroxyalkenyl-) glucosinolates in the damaged tissue (lamina, petiole, stem) and a massive accumulation of indole glucosinolates. Whilst artificial damage (puncturing), with and without associated bacterial infection with an isolate fromP. chrysocephala, led to such accumulation, this was less than that observed in the insect-infected situation.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1570-7458
    Keywords: Cabbage root fly ; Delia radicum ; Brassica oleracea ; oviposition behaviour ; glucosinolates ; glucobrassicin ; sensory physiology ; tarsal contact — chemoreceptors ; gustation ; structure — activity relationship
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The role of glucosinolates in the oviposition behaviour of the cabbage root fly,Delia radicum (L.) (Diptera, Anthomyiidae) was investigated using egg counts and electrophysiological recordings from tarsal contact chemoreceptors. The glucosinolates present both inside and on the surface of cauliflower leaves were determined. The total amounts obtained with the two methods differed by a factor of 100. The extract of the leaf surface contained about 60 μg per g leaf extracted (gle), the total leaf extract 7.5 mg per gle. The glucosinolate patterns of the two extracts were qualitatively similar, but the ratios of the content of individual glucosinolates showed considerable differences. The D sensilla on segment 3 and 4 of the tarsus ofD. radicum females were shown to contain a sensitive receptor cell for glucosinolates. In contrast, the receptor cells of the D sensilla of the other segments did not respond in a dose dependent way to these compounds. The glucosinolate receptors were found to be especially sensitive to glucobrassicin, gluconasturtiin and glucobrassicanapin with thresholds of about 10−8 M to 10−9 M. Large differences (up to two orders of magnitude) were observed among the different glucosinolates. A significant correlation was found between the behavioural discrimination index and the electrophysiological results. But no obvious correlation existed between the chemical nature of the glucosinolate side chain (e.g. indole, aromatic and aliphatic groups), and their stimulatory activity. However, a significant correlation was found between the overall length of the side chain and the biological activity. Although the flies discriminated clearly between model leaves with and without glucosinolates, a clear dose response curve was only obtained for the indole glucosinolate glucobrassicin. Since the most stimulatory fraction of the surface extract contained no glucosinolates, it was concluded that other compounds, in addition to glucosinolates, do play an important role for the stimulation of oviposition.
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 1573-5036
    Keywords: allelopathy ; glucosinolates ; isothiocyanates ; mustards ; weed
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract A number of glucosinolates and isothiocyanates were tested for their allelopathic potential against wheat. Most of the glucosinolates showed no activity against wheat, with the exception of glucobrassicin which was moderately active, as was sinapine thiocyanate. Isothiocyanates showed high activity against wheat germination and seedling growth. The most active compound, 2-phenethyl ITC completely inhibited wheat germination at 500 ppm. Allyl ITC showed high activity whereas other isothiocyanates tested were only moderately active. The data is discussed in relation to the possible use of some mustard species for effective weed control.
    Type of Medium: Electronic Resource
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  • 6
    ISSN: 1573-5044
    Keywords: Cinchona pubescens ; suspension culture ; growth ; fermentor ; precursor feeding ; alkaloids ; L-tryptophan
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The growth and alkaloid production of a liquid suspension culture of Cinchona pubescens has been studied, particularly with attention to the effect on the alkaloid spectrum of feeding cultures with L-tryptophan. This treatment did not enhance the production of any of the known alkaloids of Cinchona. Above 2mmM, however, the presence of the amino acid was toxic, causing extreme acidification of the medium and cell death. Under these conditions a number of indole and quinoline derivatives accumulated. The principal component of the alkaloid fraction proved to be norharman; indole-3-aldehyde was also isolated. Both these products probably occur by uncharacteristic metabolism of L-tryptophan. Furthermore, evidence for the degradation of endogenous alkaloids was obtained, as 4-hydroxymethylquinoline was also isolated. None of the known quinoline alkaloids of Cinchona, which were present in untreated cells, could be detected after L-tryptophan treatment, even when large amounts of culture were analysed. It is concluded that, in this instance, Cinchona alkaloid production cannot be improved by feeding with a precursor.
    Type of Medium: Electronic Resource
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  • 7
    ISSN: 1617-4623
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Twenty-five plant tissues from several species, including thirteen crown gall tissues, were analysed for the full range of unusual compounds (the opines) whose synthesis in crown gall cells and utilization by Agrobacterium tumefaciens are genetically determined by the Ti plasmids found in this bacterial species. A technique for the analysis of the non-guanidino opines by GC and GC/MS is described. None of the opines were detected in any of the various normal tissues analysed. In the crown gall tissues, on the other hand, these compounds were often present at very high levels. The type of opines found in the crown gall tissues was dependent on the strain of initiating bacterium.
    Type of Medium: Electronic Resource
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  • 8
    ISSN: 0306-042X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The mass spectra of a number of 2-trifluoromethyl-3-oxazol-5-ones, prepared from protein amino acids, have been recorded. The compounds have been separated by gas chromatography using binary column techniques. Analysis of the mass spectra has identified major fragmentation processes which, directly or indirectly, yield the nature of the amino acid sidechain. These fragmentations would be considered advantageous in the identification of unknown α-amino acids.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 11 (1984), S. 375-376 
    ISSN: 0306-042X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The potential of positive and negative Ion fast atom bombardment mass spectrometry in the examination of cyanogenic glycosides has been demonstrated by the analysis of linamarin, prunasin, neolinustatin and amygdalin.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 6 (1979), S. 462-464 
    ISSN: 0306-042X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The pyrrolidides of a number of fatty acids containing oxygen functions (ether linkage, epoxide ring and hydroxyl group) have been prepared and their mass spectra recorded. Detailed analyses of these, supported by accurate mass measurement, indicate that the presence of the oxygen atom has a profound effect on the normal, sequential, mode of pyrrolidide fragmentation. Cleavage adjacent to the oxygen is enhanced, this being most marked in the spectra of those compounds containing an either linkage. However, further fragmentation of the carbon chain distal to the pyrrolidide group is minimal and prevents any structural information being obtained. These findings indicate that the usefulness of the pyrrolidide derivative for structural elucidation purposes is severely limited in some cases when an oxygen atom is present in the chain. However, for both the epoxy- and hydroxy-fatty acids, complementary derivatization methods are available.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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