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  • 1
    Electronic Resource
    Electronic Resource
    Analysis for naturally occuring radionuclides at environmental concentrations by gamma spectrometry (1987)
    Springer
    Journal of radioanalytical and nuclear chemistry 115 (1987), S. 263-288 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract The analytical potential of low level, high resolution gamma-ray spectrometry for naturally occurring radionuclides at environmental levels is described, with particular emphasis on detector background levels and sensitivity. Comparisons are drawn between the performance of a specially designed low background detector system, and that of standard “off the shelf” devices. Sample characteristics, calibration procedures and checks, are described, and empirical minimum detection limits of between 0.4 Bq·kg−1 (226Ra,228Th) and 10 Bq·kg−1 (210Pb) are derived for soil or sediment samples of about 250 g. Representative analyses of a variety of environmental samples, including water, plant material, animal tissue and sediment, are given to illustrate the routine use of the spectrometer.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02037443
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Thermal effects of polymerization of methyl-methacrylate on small tubular bones (1987)
    Springer
    International orthopaedics 11 (1987), S. 277-282 
    Details
    ISSN: 1432-5195
    Keywords: Methyl methocrylate Heat of polymerisation ; Small bones
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Résumé Le but de ce travail est d'étudier les effets thermiques de la polymérisation sur les petits os longs. Les résultats montrent seulement, durant la prise du ciment, une élevation modérée de la température dans la cavité médullaire de ces os. L'élévation maximale (11° 7) est dans les limites de tolérance des cellules osseuses vivantes. Il a été démontré que les petites quantités de méthyl-métacrylate refroidissent plus rapidement, donc que diminuent davantage les effets nuisibles de la chaleur. Les examens histologiques ne montrent aucune altération due aux effets thermiques de la polymérisation du méthyl-métacrylate sur les petits os longs ni sur les tissus de recouvrement.
    Notes: Summary This study was designed to investigate the thermal effects of polymerization on small tubular bones. The results demonstrated only a slight increase in temperature during cement-curing in the medullary canals of these bones. The maximum rise (11.7° C) was within the levels of tolerance for living bone cells. It was demonstrated that the small volumes of methyl-methacrylate cool more rapidly, hence further decreasing the deleterious effects of heat. The histological studies showed no recognisable adverse reaction to the thermal effects of methyl-methacrylate polymerization on small tubular bones or on the overlying tissue.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00271461
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Sequence of psi, a gene on the symbiotic plasmid of Rhizobium phaseoli which inhibits exopolysaccharide synthesis and nodulation and demonstration that its transcription is inhibited by psr, another gene on the symbiotic plasmid (1987)
    Springer
    Molecular genetics and genomics 207 (1987), S. 149-154 
    Details
    ISSN: 1617-4623
    Keywords: Beans ; DNA Sequence ; Gene regulation ; Nitrogen fixation ; Nodulation ; Rhizobium
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary A gene termed psi (polysaccharide inhibition), located close to the nodulation genes of the Rhizobium phaseoli symbiotic plasmid pRP2JI inhibited exopolysaccharide synthesis (EPS) and nodulation ability (Nod) in Rhizobium when it was cloned in a multicopy plasmid. The sequence of psi showed that it specified a polypeptide of mol. wt. 10000 that may be associated with the membrane of Rhizobium. A second gene, psr (polysaccharide restoration), was located on pRP2JI. When cloned in multicopy plasmids, psr overcame the EPS and Nod defects in strains carrying multicopy psi. Strains with multicopy psr induced non-fixing nodules on Phaseolus beans. Using gene fusions between psi and lacZ, it was shown that psi inhibited transcription of psr.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00331502
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  • 4
    Electronic Resource
    Electronic Resource
    Identification of two classes of Rhizobium phaseoli genes required for melanin synthesis, one of which is required for nitrogen fixation and activates the transcription of the other (1987)
    Springer
    Molecular genetics and genomics 207 (1987), S. 155-160 
    Details
    ISSN: 1617-4623
    Keywords: Gene regulation ; Melanin synthesis ; Nitrogen fixation ; Phaseolus beans ; Rhizobium phaseoli
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The symbiotic plasmid pRP2JI of Rhizobium phaseoli strain 8002 was shown to contain two separate regions of DNA which are required and sufficient for the synthesis of the pigment melanin. One of these regions containing the class II mel gene(s) was located to other genes involved in nodulation and in nitrogen fixation. Mutations in this region abolished both the ability to synthesize melanin and to fix nitrogen in Phaseolus bean root nodules. Mutations in the other, unlinked region, containing class I mel gene(s), also abolished melanin synthesis but did not affect symbiotic nitrogen fixation. Transcriptional fusions between the class I mel gene and the Escherichia coli lacZ gene were constructed and it was demonstrated that the class II mel gene(s) activated their transcription in free-living culture. Further, strains containing the cloned regulatory class II gene(s) synthesized melanin when growing in minimal medium, in contrast to wild-type strains which became pigmented only in complete medium containing yeast extract and tryptone. It was shown by hybridization experiments that the regulatory mel gene was closely linked to or may correspond to the regulatory nifA gene; a fragment of R. phaseoli DNA which included the class II gene(s) of R. phaseoli hybridized to a previously identified nifA-like gene of R. leguminosarum, the species that nodulates peas.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00331503
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Adsorption of N-phenylglycine on hydroxyapatite: Role in the bonding procedure of a restorative resin to dentin (1987)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Biomedical Materials Research 21 (1987), S. 1329-1339 
    Details
    ISSN: 0021-9304
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine , Technology
    Notes: The adsorption of N-phenylglycine (NPG) onto synthetic hydroxyapatite from ethanol solutions was studied to elucidate the role of surface-active moieties in determining the character of adsorption, and to explore the role of NPG in a bonding procedure of restorative resin to dentin. The adsorption isotherm of N-phenylglycine is reversible (and Langmuirian) from ethanol (99.8%). At maximum adsorption the phenyl rings of the adsorbed molecules lie flat on the surface and the carboxylate oxygens and amino nitrogens are anchored to the surface. The N-phenylglycine serves as an amine accelerator since the peroxide containing monomer polymerizes with the adsorbate-covered apatite. The diametral tensile strength of this composite is approximately equal to the composite filled with untreated apatite. The role of various factors contributing to adhesive strength in the bonding procedure is also discussed.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jbm.820211105
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    Paper (German National Licenses)
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