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  • 1995-1999  (3)
  • 1990-1994
  • 1996  (3)
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  • 1995-1999  (3)
  • 1990-1994
Year
  • 1
    Electronic Resource
    Electronic Resource
    Synthesis of nanocrystalline gallium nitride in silica aerogels (1996)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 69 (1996), S. 3230-3232 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Nanocrystals of gallium nitride were synthesized in silica aerogel host matrices by pyrolysis of dimeric dimethylgallium-diphenylamide precursor sequestered in the nanometer scale aerogel pores. Powder x-ray diffraction (XRD) and selected area electron-diffraction results verify the formation of hexagonal gallium nitride material in the aerogels, and Scherrer-broadening analysis of the XRD data indicate the gallium nitride particle size is ∼20 nm. Transmission electron microscopy results show that the gallium nitride nanoparticles have diameters between 10 and 40 nm with an average diameter of 23 nm. The synthesis parameters for the gallium nitride nanocrystals in the aerogel hosts are discussed. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.118019
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    The effect of temperature on viability of carbon- and nitrogen-starved Escherichia coli (1996)
    Springer
    Microbial ecology 32 (1996), S. 11-21 
    Details
    ISSN: 1432-184X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Escherichia coli was grown in a defined medium at optimum temperature and then transferred to each of five different starvation regimes at 5°C, 20°C, or 37°C, for 1000 hours. Cells were maintained with growth-limiting amounts of carbon or nitrogen, or without either or both nutrients. Bacterial cell viability was assessed by dilution plating, the reduction of 2(p-indophenyl)-3-(p-nitrophenyl)-5-phenyl tetrazolium chloride (INT), direct viable counts (DVC), and microcolony development. The recoverability of cells on solid medium declined most rapidly, and to the greatest extent in most cases, in cultures maintained at 37°C. Only nitrogen-starved cells maintained at 5°C became completely nonculturable. The reduction of INT consistently indicated higher numbers of viable cells compared to the other methods in all cultures. The viabilities of carbon- and nitrogen-limited cells, assessed by all methods, were similar to one another at each of the temperatures. Viability was lowest at 37°C. Nutrient-downshifted cells also followed a temperature-dependent pattern of survival with viability lowest at 37°C. Morphological differences were noted at different temperatures but were most obvious for nitrogen-starved cells at 37°C, which increased in length.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00170103
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    A national framework for monitoring and reporting on environmental sustainability in Canada (1996)
    Springer
    Environmental monitoring and assessment 39 (1996), S. 25-38 
    Details
    ISSN: 1573-2959
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract In 1991, a collaborative project to revise the terrestrial component of a national ecological framework was undertaken with a wide range of stakeholders. This spatial framework consists of multiple, nested levels of ecological generalization with linkages to existing federal and provincial scientific databases. The broadest level of generalization is the ecozone. Macroclimate, major vegetation types and subcontinental scale physiographic formations constitute the definitive components of these major ecosystems. Ecozones are subdivided into approximately 200 ecoregions which are based on properties like regional physiography, surficial geology, climate, vegetation, soil, water and fauna. The ecozone and ecoregion levels of the framework have been depicted on a national map coverage at 1:7 500 000 scale. Ecoregions have been subdivided into ecodistricts based primarily on landform, parent material, topography, soils, waterbodies and vegetation at a scale (1:2 000 000) useful for environmental resource management, monitoring and modelling activities. Nested within the ecodistricts are the polygons that make up the Soil Landscapes of Canada series of 1:1 000 000 scale soil maps. The framework is supported by an ARC-INFO GIS at Agriculture Canada. The data model allows linkage to associated databases on climate, land use and socio-economic attributes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00396133
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    Paper (German National Licenses)
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