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  • 1
    Digitale Medien
    Digitale Medien
    Do tides affect water quality in the upper phreatic zone of a small oceanic island, Sipadan Island, Malaysia? (1997)
    Springer
    Environmental geology 29 (1997), S. 112-117 
    Details
    ISSN: 1432-0495
    Schlagwort(e): Key words Water quality ; Tidal change ; Upper phreatic zone ; Oceanic island
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Geologie und Paläontologie
    Notizen: Abstract  Sipadan Island is a small oceanic island with limited storage of fresh groundwater. A study was carried out to determine the effect of tidal change on the groundwater quality of such an island using temperature, dissolved oxygen content, conductivity, salinity, and pH values as indicators. Overall, the results indicated that the groundwater quality changes with tides, but the trends of fluctuation differs between the observed parameters. It was found that the percentages of changes during the period of study were 0.8% (temperature), 53% (dissolved oxygen), 61% (conductivity), 58% (salinity), and 1.7% (pH) at the centre of the island; and 0.9% (temperature), 33% (dissolved oxygen), 40% (conductivity), 42% (salinity), and 9% (pH) at a station 120 m from the coast, based on 2.9-m and 2.8-m tidal ranges at each station.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s002540050109
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  • 2
    Digitale Medien
    Digitale Medien
    Microbial and enzyme activity in soils amended with a natural source of easily available carbon (1996)
    Springer
    Biology and fertility of soils 21 (1996), S. 177-183 
    Details
    ISSN: 1432-0789
    Schlagwort(e): Key words Heterotrophic microorganisms ; Nitrification ; P solubilization ; S oxidation ; Soil enzymes ; Sugar beet
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Geologie und Paläontologie , Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft
    Notizen: Abstract The addition of sugar beet to soils as a source of C led to an increase in the availability of easily utilizable C (glucose), which in turn markedly increased numbers of soil bacteria and of the yeast Williopsis californica. Nitrification, P solubilization, urea hydrolysis (and the subsequent nitrification of liberated NH) were stimulated by this amendment. The stimulation of nitrification may have been a result of increased heterotrophic nitrification. In contrast, the concentration of sulphate in S0-amended soils declined following amendment, presumably as the result of enhanced S immobilization. Activity of the enzymes amylase, aryl sulphatase, invertase, phosphatase, dehydrogenase, and urease were all stimulated by the sugar beet amendment. These results suggest that sugar beet amendment could be used to increase the rate of release of plant-available ions from fertilizers such as insoluble phosphates. Problems may arise, however, from a subsequent increase in nitrification and reduced sulphate availability.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00335931
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  • 3
    Digitale Medien
    Digitale Medien
    Microbial and enzyme activity in soils amended with a natural source of easily available carbon (1996)
    Springer
    Biology and fertility of soils 21 (1996), S. 177-183 
    Details
    ISSN: 1432-0789
    Schlagwort(e): Heterotrophic microorganisms ; Nitrification ; P solubilization ; S oxidation ; Soil enzymes ; Sugar beet
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Geologie und Paläontologie , Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft
    Notizen: Abstract The addition of sugar beet to soils as a source of C led to an increase in the availability of easily utilizable C (glucose), which in turn markedly increased numbers of soil bacteria and of the yeast Williopsis californica. Nitrification, P solubilization, urea hydrolysis (and the subsequent nitrification of liberated NH inf4 sup+ ) were stimulated by this amendment. The stimulation of nitrification may have been a result of increased heterotrophic nitrification. In contrast, the concentration of sulphate in So-amended soils declined following amendment, presumably as the result of enhanced S immobilization. Activity of the enzymes amylase, aryl sulphatase, invertase, phosphatase, dehydrogenase, and urease were all stimulated by the sugar beet amendment. These results suggest that sugar beet amendment could be used to increase the rate of release of plant-available ions from fertilizers such as insoluble phosphates. Problems may arise, however, from a subsequent increase in nitrification and reduced sulphate availability.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00335931
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  • 4
    Digitale Medien
    Digitale Medien
    Photochromic properties of (E)-dicyclopropylmethylene-(2,5-dimethyl-3-furylethylidene)-succinic anhydride doped in epoxy polymer film (2005)
    Bingley : Emerald
    Pigment & resin technology 34 (2005), S. 275-281 
    Details
    ISSN: 0369-9420
    Quelle: Emerald Fulltext Archive Database 1994-2005
    Thema: Chemie und Pharmazie , Werkstoffwissenschaften, Fertigungsverfahren, Fertigung
    Notizen: Purpose - To evaluate the photochromic performance of photochromic compounds in polymer matrices. Design/methodology/approach - The epoxy resin doped with photochromic fulgide were prepared and the effect of UV irradiation were studied using spectrophotometer. The reversible reaction was effected using white light. The effect of heat was also determined. Findings - A film of fulgide 1-E doped in epoxy polymer was irradiated with UV light (366?nm), the film turned pink. The later colour was switched back to the original colour when the film was irradiated with a white light. The photocoloration and photobleaching obeyed first order rate equations with rate constants being 4.19×10-3?s-1 and 2.86×10-2?s-1, respectively. It was found that the film showed a good fatigue resistance. Another film was preheated at 80°C for 1-4?h. No change in the UV absorption spectra of the film was observed. Similarly, the photocoloration and photobleaching of the annealed film showed first order rate equations with rate constants being 8.77×10-3?s-1 and 4.02×10-2s-1, respectively. Interestingly, the photocoloration and photobleaching reactions of the annealed film were faster than those of the non-annealed film. Research limitations/implications - The epoxy resin doped photochromic fulgides described in the present paper was prepared and studied. The principle of study established can be applied to any type of resin or to any type of photochromic compounds. Practical implications - The photochromic materials developed can be used for different applications, such as coatings and holography. Originality/value - The method developed may be used to enhance the performance of photochromic materials.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1108/03699420510620292
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  • 5
    Digitale Medien
    Digitale Medien
    USE OF WATER FROM THE ANCIENT MAKKAH GALLERIES FOR IRRIGATION (1994)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of the American Water Resources Association 30 (1994), S. 0 
    Details
    ISSN: 1752-1688
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Architektur, Bauingenieurwesen, Vermessung , Geographie
    Notizen: : Due to the spread of Islam in the seventh century the number of pilgrims to the City of Makkah increased sharply, resulting in an acute water shortage. To solve this problem, galleries were built to collect water from the upstream of Wadi Naaman and transfer it to Makkah.Expansion of Makkah and the absence of any mapping of the galleries have resulted in the destruction of a part of the galleries. This caused a discontinuity of flow in the galleries and, consequently, the ground water table is rising at a rate of 0.48 m/yr, causing environmental problems. Research was conducted to rehabilitate the destructed part of the galleries, and to find an appropriate use for the ground water. The study found that the quality of the ground water is suitable for landscaping purposes, that is, for the irrigation of trees and ornamental plants.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1752-1688.1994.tb03278.x
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  • 6
    Digitale Medien
    Digitale Medien
    DISCUSSION1: “Reuse of Domestic Wastewater for Irrigation in Arid Zones: A Case Study,” by Gideon Oron and Joel DeMalach (1988)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of the American Water Resources Association 24 (1988), S. 0 
    Details
    ISSN: 1752-1688
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Architektur, Bauingenieurwesen, Vermessung , Geographie
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1752-1688.1988.tb00943.x
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  • 7
    Digitale Medien
    Digitale Medien
    MULTIDISCIPLINARY PLANNING AND MANAGING OF WATER REUSE (1989)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of the American Water Resources Association 25 (1989), S. 0 
    Details
    ISSN: 1752-1688
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Architektur, Bauingenieurwesen, Vermessung , Geographie
    Notizen: : This paper examines a rapidly expanding area of water supplies, specifically water reclamation and reuse, and provides a comprehensive planning methodology for developing and evaluating water reuse alternatives. The methodology uses five phases: goal setting, identification of reuse opportunities, development and evaluation of planning alternatives, assessment of water reuse linkages, and making decisions and recommendations. A tool called “input-output modeling” is used in the third phase to present numerical data and choices. The methodology seeks to integrate the hydrologic and socio-economic aspects of water resources planning in the area of study.Water reuse may satisfy some of the increasing demands for water in the world, but water quality, economics, public attitudes, and legal and institutional constraints may impose limits on the extent to which it can be employed. The challenge in planning systems is to maximize the utilization of water reuse in the fact of these constraints. The importance of multidisciplinary collaboration cannot be overemphasized.This paper assesses the potential for water reclamation and reuse in developing countries by considering the relationships among the pertinent technical, social, economic, and environmental parameters. Generally, the planning process for water reuse has focused on specific technological processes, but in order to ensure the efficient transfer of waste water reuse technology into the society, the methodology seeks to provide a conceptual model which integrates the hydrologic and socioeconomic aspects of water resources planning and water reuse within the study area. (KEY WORDS: water reuse; water reclamation; planning; methodology; model; reuse technology; socio-hydrologic systems; socioeconomic systems.)
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1752-1688.1989.tb03080.x
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  • 8
    Digitale Medien
    Digitale Medien
    Enzymatic Debranching of Glycogen: A New Pathway in Rabbit Muscle for the Enzymatic Debranching of Glycogen (1963)
    [s.l.] : Nature Publishing Group
    Nature 197 (1963), S. 979-980 
    Details
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] A New Pathway in Rabbit Muscle for the Enzymatic Debranching of Glycogen THE breakdown of glycogen by rabbit-muscle phosphorylase is far from complete, owing to the inability of this exo-enzyme to sever or by-pass the a-l,6-branch linkages, and action normally ceases when less than 40 per cent of ...
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1038/197979a0
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  • 9
    Digitale Medien
    Digitale Medien
    Characterization of a direct sample insertion device for inductively coupled plasma-atomic emission spectrometry
    Amsterdam : Elsevier
    Spectrochimica Acta Part B: Atomic Spectroscopy 45 (1990), S. 105-118 
    Details
    ISSN: 0584-8547
    Quelle: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Thema: Chemie und Pharmazie , Physik
    Materialart: Digitale Medien
    URL: http://linkinghub.elsevier.com/retrieve/pii/0584-8547(90)80082-T
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  • 10
    Digitale Medien
    Digitale Medien
    The kinetics of the reaction of chromium(III) with L-Cysteine
    Amsterdam : Elsevier
    Inorganica Chimica Acta 96 (1985), S. L35-L36 
    Details
    ISSN: 0020-1693
    Quelle: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Thema: Chemie und Pharmazie
    Materialart: Digitale Medien
    URL: http://linkinghub.elsevier.com/retrieve/pii/S0020-1693(00)87554-4
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