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  • 1
    Electronic Resource
    Electronic Resource
    Chemical characteristics of arsenic in a marine food chain (1981)
    Springer
    Marine biology 62 (1981), S. 297-305 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The various chemical forms of 74As accumulated from either water or food by the marine food chain [Fucus spiralis (L.)→ Littorina littoralis (L.)→Nucella lapillus] have been separated and characterized. Arsenic components were separated by differential extraction followed by high-voltage paper electrophoresis/paper chromatography of the water-soluble fraction and thin-layer chromatography of the lipid-soluble fraction. The algae assimilates arsenic mainly (60%) as one lipid-soluble compound with Rf=0.18, and 12 water-soluble organo-arsenic compounds as minor components. On the other hand, the snails, whether labelled from water or food, produce predominantly one major water-soluble organo-arsenic compound with Rf=0.66. This water-soluble arsenic compound was produced by the snails and not by intestinal microbes. Time-course studies on the relative proportions of labelled arsenic compounds in algal tissue indicate a transition from arsenate through water-soluble organo-arsenic components to a lipid-soluble arsenic compound. The water-soluble organo-arsenic compounds in the food chain studied were different from those previously found or proposed in marine organisms.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00397696
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  • 2
    Electronic Resource
    Electronic Resource
    Different Specificities of Proline-Activating Enzymes from Some Plant Species (1963)
    [s.l.] : Nature Publishing Group
    Nature 200 (1963), S. 148-151 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] IN recent years many amino-acid analogues have been chemically synthesized and used as antimetabolites to natural compounds in the synthesis of proteins1, while a large number of naturally occurring, newly characterized amino- and imino-acids2,3 appear to have been neglected in such ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/200148a0
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  • 3
    Electronic Resource
    Electronic Resource
    Significance of Selenocystathionine in an Australian Selenium-accumulating Plant, Neptunia amplexicaulis (1967)
    [s.l.] : Nature Publishing Group
    Nature 213 (1967), S. 599-600 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Three seedlings (with an average selenium content of 123 [jig/seed) were grown for 6 weeks, to the stage of four compound leaves, in nutrient solution cultures which contained no added selenium3. The root systems were coiled in a small beaker and immersed in 4 ml. water containing 0-4 me. sodium ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/213599a0
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  • 4
    Electronic Resource
    Electronic Resource
    Colloidal Selenium Availability to Three Pasture Species in Pot Culture (1966)
    [s.l.] : Nature Publishing Group
    Nature 212 (1966), S. 961-962 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] We have used selenium-75 as a means of following the course of selenium metabolism, principally by studying the metabolism in a number of speeies of plants of selenite and selenate containing selenium-75 (ref. 8), the excretion of ingested selenium by sheep and its subsequent use by plants8'10. ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/212961b0
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  • 5
    Electronic Resource
    Electronic Resource
    Chromium uptake and transport in barley seedlings (Hordeum vulgare L.) (1976)
    Springer
    Planta 132 (1976), S. 209-214 
    Details
    ISSN: 1432-2048
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Potassium chromate is more toxic to the growth of barley in solution culture than chromic chloride, though apparent uptake of the latter is much faster. Inhibitor studies indicate that CrO4 2- uptake is “active” whereas Cr3+ uptake is passive, demonstrating that the two forms do not share a common uptake mechanism. Studies on the form of Cr inside root cells show that in plants fed CrO4 2- the Cr remains largely unchanged whereas in plants fed Cr3+ a little CrO4 2- (0.5 per cent) is produced. This conversion is dependent on the presence of living material and is probably enzymatic. Chromate uptake follows Michaelis-Menten kinetics at low concentration and is competitively inhibited by sulphate. Transport of chromium up the root is very slow, accounting for the low levels of Cr in the shoots. Chromate is transported better than Cr3+ though still to a very limited extent. These experiments provide a physiological basis for previous observations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00399719
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  • 6
    Electronic Resource
    Electronic Resource
    Chromium-51 distribution in tissues and extracts of Leptospermum scoparium (1969)
    Springer
    Planta 88 (1969), S. 282-287 
    Details
    ISSN: 1432-2048
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Leptospermum scoparium plants cultured in solutions containing Na2 51CrO4 accumulated most of the absorbed radioactivity in the roots. About one third of the root radioactivity was soluble in 80% ethanol in the form of three 51Cr-complexes, the predominant one being identified as trioxalatochromate (III) ion. These complexes were also present in stem and leaf extracts. 51Cr distribution was examined in various chemical fractions; protein and nucleic acids were especially low in radioactivity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00385071
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  • 7
    Electronic Resource
    Electronic Resource
    The accumulation and assimilation of dimethylselenide by four plant species (1984)
    Springer
    Planta 160 (1984), S. 180-184 
    Details
    ISSN: 1432-2048
    Keywords: Agrostis ; Dimethylselenide ; Hordeum (Se assimilation) ; Lycopersicon (Se assimilation) ; Raphanus
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Plants of Agrostis tenuis Sibth., Hordeum vulgare L., Lycopersicon esculentum Mill. and Raphanus sativus L. were grown hydroponically in sealed systems and fumigated with 8 μg m-3 [75Se]-dimethylselenide. The accumulation of 75Se was measured and the shoot tissues were extracted to examine the products of the 75Se assimilation. Characteristic differences were observed between species in the accumulation of 75Se and the transport from shoots to roots. High-voltage electrophoresis and chromatography of extracts made with 80% aqueous ethanol revealed the presence of inorganic selenite as an assimilation product as well as the selenium analogues of glutathione and methionine. Extensive incorporation of 75Se into protein-bound selenomethionine was observed in all plant species.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00392868
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  • 8
    Electronic Resource
    Electronic Resource
    Gold uptake by perennial ryegrass: The influence of humates on the cycling of gold in soils (1989)
    Springer
    Biogeochemistry 7 (1989), S. 3-10 
    Details
    ISSN: 1573-515X
    Keywords: gold ; humates ; humic acid ; cycling in soils ; plant uptake
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Geosciences
    Notes: Abstract An experiment in which perennial ryegrass (Lolium perenne L.) was grown in solution cultures containing various forms of radioactive gold (198Au) is described. Uptake of labelled Au from solutions containing either Au chloride or various Au-humic acid (HA) complexes is compared. In each case concentrations of Au in the plant roots were several fold higher than in the plant shoots. However, the Au concentration in roots from some of the Au-HA preparations was only about 5% of that from the Au-HA solutions. High voltage electrophoresis studies indicate the presence of several Au-HA complexes in the solution cultures. The relevance of these findings to the cycling of Au within soils is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00000894
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  • 9
    Electronic Resource
    Electronic Resource
    The influence of humic and fulvic acids on silver uptake by perennial ryegrass, and its relevance to the cycling of silver in soils (1986)
    Springer
    Plant and soil 95 (1986), S. 3-8 
    Details
    ISSN: 1573-5036
    Keywords: Fulvic acids ; Humic acids ; Lolium perenne L. ; Silver
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary An experiment in which perennial ryegrass (Lolium perenne L.) was grown in solution cultures containing various forms of radiosilver (110mAg) is ptake of labelled Ag from solutions containing either AgNO3, Ag2SO4, AgCH3COO, Ag-humic acid (HA) or Ag-fulvic acid (FA) complexes is compared. In each case concentrations of Ag in the plant roots was several fold higher than in the plant shoots. However the Ag concentration in roots from the Ag-HA preparations was only about 5% of that from the AgNO3 solutions; from Ag-FA it was 18%. Transport index values were highest for plants grown in the Ag-HA solution, indicating greater mobility of Ag within these plants. Preliminary data for a selective extraction procedure performed on Ag-HA preparations suggest sorption onto various active sites. The relevance of these findings to the cycling of Ag within soils is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02378846
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  • 10
    Electronic Resource
    Electronic Resource
    Trace elements in a New Zealand serpenting flora (1968)
    Springer
    Plant and soil 29 (1968), S. 225-240 
    Details
    ISSN: 1573-5036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary The trace element content of ashed specimens of a New Zealand serpentine flora and the associated soils was investigated. Six species (Myosotis monroi Cheesem.,Notothlaspi australe Hook. f.,Pimelea suteri Kirk,Cassinia vauvilliersii (Homb. et Jacq.) Hook. f. varserpentina Ckn. et Allan,Hebe odora (Hook. f.) Ckn. andLeptospermum scoparium J. R. et G. Forst.) were analysed for cobalt, chromium, copper and nickel by emission spectroscopy. The significance of the experimental data was evaluated by calculation of the correlation coefficients by a computer.C. vauvilliersii showed highly significant correlation between plant ash and soil concentration for chromium, cobalt and nickel.H. odora andL. scoparium showed similar but less pronounced correlations. Relative concentrations varied considerably among the species studied.P. suteri is a strong accumulator of nickel and cobalt andL. scoparium of chromium. Good correlations were observed for certain pairs of elements in the plant ash of individual species and in the soils alone. Data for uptake by plants were compared with soil extractabilities. Calcium-magnesium ratios were also determined, and were found to be much lower than in the same species growing on non-serpentinized soils. It was concluded that the above species, particularlyC. vauvilliersii will be useful in biogeochemical prospecting.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01348940
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