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  • 1995-1999  (7)
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  • 1
    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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  • 2
    Electronic Resource
    Electronic Resource
    Crystallization and preliminary X-ray diffraction studies of arginase from a thermophilic organism Bacillus caldevelox (1995)
    Copenhagen : International Union of Crystallography (IUCr)
    Acta crystallographica 51 (1995), S. 840-841 
    Details
    ISSN: 1399-0047
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: A thermostable hexameric arginase purified from the extreme thermophile Bacillus caldevelox has been crystallized from Hepes buffer at pH 7.5 in the presence of 12% polyethylene glycol 4000 and 10% 2-propanol, and from cacodylate buffer at pH 7.2 in the presence of 15% 2-propanol and sodium citrate. The latter crystals are more suitable for X-ray diffraction analysis. The crystals are in the orthorhombic space group P212121 with unit-cell dimensions a = 156.3, b = 148.0 and c = 85.4 Å. The asymmetric unit contains one hexamer (approximate molecular mass 183 kDa) and has a solvent content of approximately 54%. The crystals diffract to 2.8 Å resolution.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0907444995001168
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Ultraviolet-blue emission and electron-hole states in ZnSe quantum dots (1999)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 75 (1999), S. 1688-1690 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We observed the quantum-confined band edge emission from ZnSe quantum dots and the size dependence of the energy states, spin-orbit interaction, and Stokes shift. The band edge emission occurs in the ultraviolet blue. The energy gap=Eg+C/dn where d is the diameter and n is 1.19±0.13 and 1.21±0.13 for the first and second electron-hole transitions, respectively. The separation between these transitions approaches the bulk spin-orbit splitting, while the Stokes shift decreases with particle size. Effective mass theories cannot explain these results. Trap emission is observed in some samples in the green and red, resulting from Se-related traps. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.124834
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  • 4
    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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  • 5
    Electronic Resource
    Electronic Resource
    The TRAIL of Death (1998)
    Springer
    Apoptosis 3 (1998), S. 83-88 
    Details
    ISSN: 1573-675X
    Keywords: Apoptosis ; TNF ; TRAIL
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract The TNF ligand family member termed TRAIL has been shown to induce apoptosis in a wide variety of transformed cell lines. The normal functions of this cytokine in vivo remain, however, relatively unknown. The complexity of this biological system has now increased unexpectedly with the identification of four distinct receptors for TRAIL, two of which have cytoplasmic death domains. This review will describe the known biological effects of TRAIL, as well as the structure and possible functions of its recently identified receptors.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1009640823621
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  • 6
    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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  • 7
    Electronic Resource
    Electronic Resource
    Plutonium(IV) mononitrate and dinitrate complex formation in acid solutions as a function of ionic strength (1998)
    Springer
    Journal of radioanalytical and nuclear chemistry 235 (1998), S. 25-29 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract Titrations of Pu(IV) with HNO3 in a series of aqueous HClO4 solutions ranging in ionic strength from 2 to 19 molal were followed using visible and near-infrared absorption spectrophotometry. The Pu 5f-5f spectra in the visible and near IR range change with complex formation. At each ionic strength, a series of spectra were obtained by varying nitrate concentration. Each series was deconvoluted into spectra of Pu4+ (aq), Pu(NO3)3− and Pu(NO3)2 2+ complexes, and simultaneously their formation constants were determined. When corrected for the incomplete dissociation of nitric acid, the ionic strength dependence of each formation constant can be described by two parameters, β0 and Δε using the formulae of specific ion interaction theory.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02385932
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