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  • 1
    Electronic Resource
    Electronic Resource
    Nitrification in the rhizosphere of a flooding-resistant and a flooding-non-resistant Rumex species under drained and waterlogged conditions (1991)
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology letters 86 (1991), S. 0 
    Details
    ISSN: 1574-6968
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Abstract The effects of the flooding-resistant plant species Rumex palustris and the non-flooding-resistant plant species Rumex acetosa on nitrification were compared. The plants were grown under drained and waterlogged conditions on a mixture of calcareous riversand and sieved grassland soil with a high potential nitrifying activity. In the shoots of R. acetosa, but not in those of R. palustris, the ratio between the amounts of accumulated carboxylates and organic nitrogen, ((CA-A)/Norg.), appeared to be a useful indicator of ammonium or nitrate consumption by tghe plant. In both plant species, the inorganic nitrogen source had no observed effect on the (C-A)/Norg. ratio in the roots.The growth of R. acetosa, but not that of R. palustris was inhibited by waterlogging of the soil. Both the activity and the growth of the ammonium-oxidizing bacteria were repressed under drained and waterlogged conditions in soils with R. palustris, a condition that was attributed to a competitive ammonium uptake by its relatively fast growing roots. In the presence of R. acetosa, the activity and growth of the ammonium-oxidizing bacteria were inhibited under waterlogged, but not under drained, conditions. he growth and activity of nitrite-oxidizing bacteria in the absence of actively ammonium-oxidizing, nitrite-producing bacteria was likely due to organotrophic growth.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1574-6968.1991.tb04793.x
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  • 2
    Electronic Resource
    Electronic Resource
    Differences in Hollow Volumes in Cooked Rice Grains with Various Amylose Contents as Determined by NMR Micro Imaging (2000)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 65 (2000), S. 0 
    Details
    ISSN: 1750-3841
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: The presence of hollows in cooked rice grains found before in the cultivar Koshihikari was confirmed for 4 more cultivars with various amylose contents. The size, shape, and total volume of hollows differed between cultivars. Hollow volumes increased with grain volume and length before 100 °C was reached, but subsequently decreased during prolonged boiling. The previously proposed mechanism, describing sealing by gelatinized starch of cracks formed during soaking, seemed accurate for all 5 cultivars. Based on the hypothetical model of their formation, a relationship between amylose content and hollow formation was assumed. However, no correlation existed between final hollow volume and shape on 1 side and individual parameters such as flour gelatinization and amylose content on the other side.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2621.2000.tb16017.x
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