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  • Articles  (15)
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  • Springer  (15)
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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Environmental management 5 (1981), S. 341-352 
    ISSN: 1432-1009
    Keywords: Environmental management ; Systems analysis ; Risk assessment ; Exposure analysis ; Cadmium ; Environmental modeling
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract The effects of selected environmental control strategies on human dietary and respiratory exposure to environmental cadmium (Cd) have been simulated. For each control strategy, mean Cd dietary and respiratory exposures are presented for a twenty-year simulation period. Human exposures related to cadmium are associated with both process waste disposal and product disposal. Dietary exposure is by far the dominant mechanism for Cd intake. Dietary exposure related to aqueous discharges is primarily a result of municipal sludge landspreading, whereas that associated with emissions to the atmosphere derives mainly from the deposition on cropland of airborne particulates from product incineration. Only relatively small dietary exposure reductions are possible through restrictions on anysingle Cd use. Combinations of waste management and environmental control measures promise greater reductions in dietary and respiratory exposure than those achievable through use restrictions.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Environmental management 5 (1981), S. 191-205 
    ISSN: 1432-1009
    Keywords: Pollutant toxicity ; Water Quality Criteria ; Microbemediated ecological processes ; Ecological dosage 50% (EcD50) ; Cadmium ; Phenol ; Physicochemical environmental factors
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract The physicochemical characteristics of the recipient environment into which chemical contaminants are deposited may influence their chemical speciation, mobility, bioavailability, and toxicity. In formulating Water Quality Criteria, the Environmental Protection Agency of the United States (EPA) considered the modifying effect of abiotic environmental factors on pollutant toxicity in an innovative regulatory approach. Scientific knowledge of the interactions and correlations between pollutant toxicity and abiotic factors remains limited. Recognition of the influence of the physicochemical characteristics of the recipient environment on pollutant toxicity has implications for the eventual formulation of regional, rather than uniform and national, criteria. In addition, in developing Water Quality Criteria that incorporate the effects of pollutants on “aquatic life,” EPA primarily focused on toxicity to aquatic animals and plants (including unicellular algae). The effects of pollutants on microbe-mediated ecological processes that are necessary for maintaining the state and quality of the ecosphere (such as biogeochemical cyclings, litter decomposition, and mineralization) were not included in the formulation of the Water Quality Criteria. To facilitate the recognition and quantification of adverse effects of pollutants on these ecological processes, the development of a computation, termed the “ecological dosage 50%” (EcD50) is recommended. Such a formulation could also be applied to setting environmental quality criteria for terrestrial ecosystems.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Environmental management 5 (1981), S. 409-425 
    ISSN: 1432-1009
    Keywords: Photovoltaics ; Indoor air pollution ; Occupational health ; Energy production ; Solar energy ; Tidal power ; Wind power ; Health effects ; Toxic chemicals ; Cadmium
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract No energy technology is risk free when all aspects of its utilization are taken into account. Every energy technology has some attendant direct and indirect health and safety concerns. Solar technologies examined in this paper are wind, ocean thermal energy gradients, passive, photovoltaic, satellite power systems, low- and high-temperature collectors, and central power stations, as well as tidal power. For many of these technologies, insufficient historical data are available from which to assess the health risks and environmental impacts. However, their similarities to other projects make certain predictions possible. For example, anticipated problems in worker safety in constructing ocean thermal energy conversion systems will be similar to those associated with other large-scale construction projects, like deep-sea oil drilling platforms. Occupational hazards associated with photovoltaic plant operation would be those associated with normal electricity generation, although for workers involved in the actual production of photovoltaic materials, there is some concern for the toxic effects of the materials used, including silicon, cadmium, and gallium arsenide. Satellite power systems have several unique risks. These include the effects of long-term space travel for construction workers, effects on the ozone layer and the attendant risk of skin cancer in the general public, and the as-yet-undetermined effects of long-term, low-level microwave exposure. Hazards may arise from three sources in solar heating and cooling systems: water contamination from corrosion inhibitors, heat transfer fluids, and bactericides; collector over-heating, fires, and “out-gassing” and handling and disposal of system fluids and wastes. Similar concerns exist for solar thermal power systems. Even passive solar systems may increase indoor exposure levels to various air pollutants and toxic substances, eitherdirectly from the solar system itself or indirectly by trapping released pollutants from furnishings, building materials, and indoor combustion.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1573-5036
    Keywords: Calcareous soils ; Corn ; P ; Zea mays ; Zn
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Positive relationships were observed between Zn and P in the studied calcareous soils and in the corn plants grown thereon. The high content of carbonates in these soils affected greatly the levels of extractable Zn and the Zn−P relationships. In the pot experiment, application of P increased the Zn content of the corn plants and application of Zn increased that of P.
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Plant and soil 60 (1981), S. 223-236 
    ISSN: 1573-5036
    Keywords: Alfalfa ; Cadmium ; Lead ; Nickel ; Tissue concentration ; Yield depressions
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Alfalfa (Medicago sativa L.), cv. Iroquois, was grown in the greenhouse in soils amended with additions of either lead, cadmium, or nickel. Metals, at rates varying from 0–250 ppm, were not uniformly mixed but were placed close to the soil surface so as to simulate surface deposition. In one series of experiments the sulphate salt of each metal and two soils were used. In a second series of experiments the nitrate salts and one soil were used. Neither salt of lead significantly depressed alfalfa yields. Both salts of either cadmium or nickel significantly depressed yields. Additions of all metals to the soil resulted in both increased metal uptake and concentrations in alfalfa tissue, particularly for cadmium and nickel. The highest tissue concentrations of cadmium and nickel were associated with plant stunting and necrosis. However, at rates of 125 ppm and less, substantial increases in cadmium and nickel concentrations were obtained frequently without serious yield reductions. Generally, metal concentrations were greatest in the first harvest following metal application. Concentration and uptake of lead and cadmium were greater when the metal was applied to the soil as nitrate than when applied as the sulphate salt.
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Plant and soil 62 (1981), S. 81-89 
    ISSN: 1573-5036
    Keywords: Cadmium ; Lead ; Nickel ; Oats ; Ryegrass ; Tissue concentration ; Yield depression
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary A 24 factorial experiment was conducted under greenhouse conditions. Factors and levels in the experiment were soil pH at 4.5 and 6.4, and cadmium, lead, and nickel added to the soil to provide soil concentrations of 50, 250, and 50 ppm, respectively, above background levels. Two species were grown in succession in the same experimental pots. Ryegrass (Lolium hybridum Hausskn. cv. Tetrelite) was harvested three times and then one crop of oats (Avena sativa L. cv. Garry) was grown and harvested. Plant tissue concentrations of cadmium, lead, and nickel were monitored throughout the experiment. Addition of cadmium to the soil lowered the dry matter yields in all three ryegrass harvests and also reduced the yield of oat grain. The application of lead nitrate to the soil enhanced the yield of ryegrass obtained at the first harvest and also increased the yield of oat grain. Nickel, added to the soil at 50 ppm, was relatively innocuous to ryegrass and oats. The presence of added cadmium, lead, or nickel to the soil resulted in enhanced tissue concentrations of these metals in both ryegrass and oats. This effect was particularly enhanced by a soil pH of 4.5. A single exception to this observation was that lead was not detected, under any of the conditions of this experiment, in oat grain. The presence of lead in the soil enhanced cadmium concentrations in ryegrass tissues. The presence of cadmium in the soil decreased lead tissue concentrations in ryegrass and oat straw. Soil pH interacted with both nickel and lead in the second ryegrass harvest with subsequent changes in tissue cadmium concentrations. At a soil pH of 4.5, the presence of added lead or nickel to the soil significantly increased the ryegrass tissue cadmium concentration beyond that observed at a soil pH of 6.4 with or without enhanced nickel or lead concentrations.
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Plant and soil 63 (1981), S. 39-46 
    ISSN: 1573-5036
    Keywords: Carboxylate feed-back systems ; Electroneutrality ; Ion absorption ; Ion transport ; Zea mays
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Plant and soil 63 (1981), S. 65-72 
    ISSN: 1573-5036
    Keywords: Growth co-ordination in roots ; Seminal roots ; Crown roots ; Zea mays
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Conclusions The experimental results presented show that within the intact plant growing undisturbed a serious competition exists between various root members. When as a consequence of partial derooting or local inhibitory treatments shoot growth is not affected the remaining root members compensate completely for the reduction elsewhere. Competition for a limited supply of carbohydrates covers most of the observations [1]. However, since it has been shown that with the phloem stream various hormones are transported to the roots, some of which may affect root growth [4, 5], the ultimate solution needs additional experimentation [10]. In case of the differences in the rate of root elongation in nitrogen deficient plants and in plants well-supplied with nitrogen, the higher auxin content in the latter may be responsible for the lower elongation rate [5].
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Plant and soil 63 (1981), S. 77-81 
    ISSN: 1573-5036
    Keywords: Root growth ; Root morphology ; Root function ; Phosphate supply ; Mechanical resistance ; Zea mays
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Conclusions The influence of mechanical soil resistance on shoot growth can be explained qualitatively by its influence on root morphology. When relating ion uptake quantitatively to a certain root parameter (length, surface area, weight), availability of nutrients in the different soil layers must be taken into consideration.
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  • 10
    ISSN: 1573-5036
    Keywords: Calcareous soils ; Corn ; P-fertilization ; Zea mays ; Zn-fertilization
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary In a field experiment, more than 22% increase in the grain yield of corn was obtained by the application of 50 kg ZnSO4/ha. Grain yields were also increased by increasing the level of applied phosphorus. Positive relationship was obtained between Zn and P, the phosphorus treatment increased Zn uptake by grains and vice versa.
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