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  • 1
    ISSN: 1745-6584
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Geosciences
    Notes: Aquifer samples from the precipitation zone of an in situ iron and manganese removal plant that was operated for 10 years were analyzed for iron and manganese minerals. Measurements were performed by various chemical extraction techniques (5 M HC1,0.008 M Ti(III)-EDTA, 0.114 M ascorbic acid), X-ray diffraction and Mössbauer spectroscopy. Chemical extractions showed that iron was precipitated as ferric oxides, whereas manganese was not oxidized but deposited as Mn(II) probably within carbonates. The ferric oxides in particular accumulate preferentially in the smaller grain- size fractions. This tendency was observed to a lesser extent for manganese. X-ray diffraction and Mössbauer spectroscopy showed that the ferric oxides were mainly crystalline (goethite, 50% to 100% of the iron). Ferrihydrite was found as well, but only as a minor fraction (≤ 12%). Pure manganese minerals were not found by X-ray diffraction. The precipitated amounts of iron (5 to 27 μmol/g Fe as ferric oxide) and manganese (1 to 4 μmol/g Mn) during 10 years operation of the treatment plant agree with values that were estimated from operational parameters (9 to 31 μmol/g Fe and 3 to 6 μmol/g Mn). Considering the small amounts of precipitated iron and manganese, no long-term risks of clogging of the aquifer are expected.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 54 (1989), S. 0 
    ISSN: 1750-3841
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Sensory studies were conducted to estimate the perceived vanillin flavor of protein-vanillin systems that contained free vanillin and vanillin bound to fababean protein micellar mass (PMM). Nine panelists used the magnitude estimation technique to evaluate vanillin flavor by tasting. A power function was established from a series of different concentrations of vanillin solutions versus their respective sensory estimates of vanillin flavor and used to convert sensory estimates to perceived vanillin concentrations of the vanillin-PMM slurries. The perceived vanillin in vanillin-PMM systems was directly related to the free vanillin in the corresponding system as determined by HPLC, indicating that only the free vanillin contributed to the flavor. Thus, instruments can be used to predict human perception of a particular flavorant in a food system of flavor-protein interactions.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 54 (1989), S. 0 
    ISSN: 1750-3841
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Binding of vanillin by fababean protein micellar mass (PMM) in water suspensions was investigated. Free vanillin was determined by HPLC and data were evaluated by the Klotz equation. Increasing vanillin and PMM concentrations increased the percentage of total vanillin bound to protein. Binding capacities of heat-treated (denatured) PMM were higher than that of untreated (native) PMM. Binding forces between vanillin and PMM were weak, and the number of binding sites increased when PMM was denatured.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 184 (1959), S. 2030-2030 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] It has therefore occurred to me, and independently to others, that failure to produce prolactin might be a basic factor in the development of brood parasitism. Hence a comparison of the prolactin content of the pituitaries of female cowbirds in breeding condition, with that of pituitaries of ...
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 169 (1952), S. 844-844 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] On the basis of the results reported in 1950, it appeared that the essential criterion for direct progestational activity in the rabbit was a steroid nucleus with a side-chain of at least one carbon atom at C-17. Since then, intra-uterine implantations with 3a 20(3 pregnanediol have been carried ...
    Type of Medium: Electronic Resource
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  • 6
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] In the phalaropes (a sub-family of throe species only, two holarctic, one Wilson's (Steganopus tricolor), nearctic) only males incubate and only they form brood patches. Johns and Pfeiffer2 showed experimentally that the hor monal stimuli for brood patch formation in two species of phalaropes (one ...
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 73 (1969), S. 3880-3883 
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Science Ltd
    Freshwater biology 40 (1998), S. 0 
    ISSN: 1365-2427
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: 1. The ecology of riparian zones is enormously influenced by the heterogeneous sedimentary structures and associated complex hydrologic flow paths that mediate surface- and groundwater exchanges. Sedimentary structures form a three-dimensional, dynamic framework that controls subsurface flow and the vertical and horizontal exchange of water between channels and floodplains in gravel bed rivers. The modern structure of the bed sediments reflects the legacy of cut and fill alluviation for a particular river basin.2. Highly permeable sedimentary textures, particularly open framework gravels, allow rapid exchange between surface and groundwaters.3. Ground penetrating radar provides high resolution information on the nature and three-dimensional distribution of the sediments within the shallow subsurface (4–25 m) of gravel bed rivers. Bed sediments can be mapped at the decimeter scale.4. Exchange and mixing of ground and channel water occurs along losing, gaining and flow-through reaches as determined by the hydraulic gradient and transmissivity of the bed sediments.5. Spatial and temporal patterns of surface- and groundwater interactions can be quantified by mass flux measurements and by assessing geochemical contrasts. Natural tracers, such as temperature or radon, are well suited for mapping exchange sites and quantifying interactions. Artificial signals produced by injecting anions, like chloride, bromide and organic dyes are also useful.6. The study of riparian ecosystems requires an understanding of the geomorphic structures and processes that build and maintain bed sediments and flow pathways through them.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Journal of Chromatography A 194 (1980), S. 251-253 
    ISSN: 0021-9673
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Springer
    Rheologica acta 25 (1986), S. 72-73 
    ISSN: 1435-1528
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
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