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  • 1
    Electronic Resource
    Electronic Resource
    Laser beam deviation as a local density probe (1989)
    Springer
    Experiments in fluids 7 (1989), S. 303-308 
    Details
    ISSN: 1432-1114
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract In axisymmetric flows, we show that the laser beam deviation technique can be associated with an Abel inversion calculation in order to give the local density and its gradients. We report density profile measurements in the different regions (zone of silence and barrel shock) of nitrogen and argon supersonic free jets near the nozzle exit. Three different nozzle geometries have been tested at different stagnation pressures. Results are compared to calculations obtained by the method of characteristics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00198448
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  • 2
    Electronic Resource
    Electronic Resource
    Elemental, functional infrared and free radical characterization of humic acid-type fungal polymers (melanins) (1987)
    Springer
    Biology and fertility of soils 5 (1987), S. 120-125 
    Details
    ISSN: 1432-0789
    Keywords: Fungal melanins ; Humic acid ; Infrared analysis ; Free radicals
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Humic acid-type polymers (melanins) synthesized in culture media by the fungi Aspergillus glaucus, Eurotium echinulatum, Hendersonula toruloidea, Stachybotrys atra and Aspergillus sydowi were analysed for elemental composition, functional group content, infrared (IR) and electron spin resonance (ESR) properties. Results were discussed in comparison with range values referred for soil humic acids. The fungal polymers showed significant differences in carboxyl and nitrogen content and C/H atomic ratios, reflecting a different degree of condensation (aromaticity) among the various samples. IR analysis gave evidence of: (a) the predominant aromatic character of melanins from A. glaucus, E. echinulatum and H. toruloidea; (b) the high content of aliphatic and olefinic components of S. atra melanin; (c) the typical presence of amide bonds in the nitrogen-richest melanins from A. sydowi and H. toruloidea; and (d) the generally low amount of free carboxyl groups, which often appeared involved in hydrogen bonds. ESR spectra showed that all the melanins studied contained appreciable concentrations of organic free radicals of prevailing semiquinonic nature and of the same order of magnitude commonly measured in humic acids from soil and other sources. The free electron concentration was shown to be directly related to the C/H atomic ratio and to the degree of aromaticity shown by IR analysis. This indicated that the highest free radical content in the melanins from E. echinulatum and A. glaucus was associated with the highest presence of condensed aromatic structures. Humic acid-type polymers synthesized by soil fungi may, therefore, contribute to the total free radical content of soil humic substances and play important roles in all reactions involving free radicals in soils and related environments.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00257646
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  • 3
    Electronic Resource
    Electronic Resource
    Quantitative assessment of feline epidermal Langerhans cells (1997)
    Oxford, UK : Blackwell Publishing Ltd
    British journal of dermatology 136 (1997), S. 0 
    Details
    ISSN: 1365-2133
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: The densities of feline epidermal dendritic cells expressing CD18. MHC class II and CD1a antigens were determined for four anatomical locations in 19 cats of European breed in blind conditions. The densities (±SD) of CD1a+ Langerhans cells in the skin of the abdominal wall (269±68 cells/mm2), the back (363±19), the internal side of the ear (572±30) and the external side of the ear (502±32) were significantly different, with young and old animals displaying less stained cells than adults. No significant differences in the mean densities were found with regard to sex, colour or antibody used.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-2133.1997.01822.x
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  • 4
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    The Development of Criminology in Britain 1948-1960 (1988)
    London : Periodicals Archive Online (PAO)
    British Journal of Criminology, Delinquency and Deviant Social Behaviour. 28:2 (1988:Spring) 165 
    Details
    ISSN: 0007-0955
    Topics: Law
    Notes: A HISTORY OF BRITISH CRIMINOLOGY
    URL: http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&res_dat=xri:pao:&rft_dat=xri:pao:article:4065-1988-028-02-000004
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  • 5
    Electronic Resource
    Electronic Resource
    Respiratory symptoms and pulmonary function in 871 miners according to Pi phenotype: A longitudinal study (1988)
    Springer
    European journal of epidemiology 4 (1988), S. 39-44 
    Details
    ISSN: 1573-7284
    Keywords: Epidemiology ; Occupational pathology ; Chronic bronchitis Iron miners ; Protease inhibitor (Pi) phenotype
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Pi phenotype was determined and α1 protease inhibitor (α1Pi) was measured in 871 iron-ore miners examined twice at five years interval. A questionnaire on respiratory symptoms was administered and lung function tests: spirometry (VC, FEV1.0), measurements of the residual volume (RV/TLC) and of the CO diffusion (FuCO), were carried out by the same medical and technical team, using the same apparatus. There were no differences in age, lenght of employment or smoking habits among the three Pi Phenotype groups: M (90:03%), MS (7.1%), MZ (2.8%). The prevalence of clinical symptoms at the initial survey and the incidence of symptoms between the 2 surveys were not related to Pi Phenotype groups. However a significantly steeper decline of FEV1.0/VC was observed in the α1Pi partially deficient groups MS and MZ (−3.9%) compared with the non-deficient group (−1.8%). No significant difference was observed for VC, RV /TLC and FuCO. This finding suggests that an intermediate deficiency of α1Pi may be related to a slight but statistically significant impairment of a lung function in occupational conditions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00152690
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  • 6
    Electronic Resource
    Electronic Resource
    A thermoresistant strain of feline immunodeficiency virus (FIV) with an altered cytopathic effect and a restricted cell tropism (1998)
    Springer
    Archives of virology 143 (1998), S. 2093-2107 
    Details
    ISSN: 1432-8798
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary.  A thermoresistant strain, designated m41, of feline immunodeficiency virus (FIV) was selected after 31 successive passages of chronically infected IRC4 cells at 41 °C. The wild-type virus (wt) which served as a control was cultivated the same number of times at 37 °C. In Crandell feline kidney cells (CrFK), the replication of m41 was similar at 37 °C and 41 °C, whereas wt multiplied only at 37 °C. Furthermore, m41 was more resistant than the wt strain at temperatures ranging from 37 to 56 °C. Syncytia formation was observed with m41 when the CrFK were incubated at 41 °C whereas neither m41 nor wt produced syncytia at 37 °C. The level of replication of wt and m41 on feline lymphoid primary cells at 37 °C was similar. In contrast to wt, m41 was unable to infect bone marrow macrophages. Since one or several mutations in the envelope (env) gene could be involved in changes of cell fusion properties and of cellular tropism, the nucleotide sequence of the env gene derived from wt and m41 respectively was determined. Ten mutations were found in the env gene of m41, thus leading to 9 amino acid modifications in the envelope glycoproteins. These results suggest that structural modifications of the viral envelope proteins are prerequisites for the replication of a thermoresistant FIV strain at elevated temperature and are correlated with the newly acquired viral phenotype.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s007050050446
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  • 7
    Electronic Resource
    Electronic Resource
    Temperature-sensitive mutants of mouse hepatitis virus type 3 (MHV-3): isolation, biochemical and genetic characterization (1988)
    Springer
    Archives of virology 100 (1988), S. 147-160 
    Details
    ISSN: 1432-8798
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Mouse hepatitis virus 3 (MHV-3) is highly hepatotropic in sensitive mice. Temperature-sensitive mutants (ts mutants) induced by N-methyl-N′-nitrosoguanidine and 5-fluorouracil were isolated. Twelve mutants which were able to induce the formation of syncytia at 33°C but not at the restrictive temperature (39.5°C) were selected for detailed study. No viral RNA synthesis was detected after infection at the restrictive temperature with six of the mutants (RNA−) whereas six others were RNA+, although they displayed RNA synthesis which was generally reduced. No differences have been detected in the size of the genome or the viral-intracellular RNA species found in wild type virus or ts mutant infected cells at permissive temperature. The pattern of virus-induced proteins analyzed after immunoprecipitation by SDS-PAGE was similar in wild type virus and RNA+ mutant infected cells at 39.5°C. Complementation experiments between ts mutants enabled us to distinguish five groups. Three of the groups contained RNA− mutants and two of them RNA+. Plaques made by mutants in one group displayed characteristic features that distinguished them from the wild type.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01487679
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  • 8
    Electronic Resource
    Electronic Resource
    The band structure in124Ba (1987)
    Springer
    The European physical journal 326 (1987), S. 337-338 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Excited states of124Ba have been studied using the96Zr (34S,6n) reaction at 160 MeV. The yeast band is observed up to a 1π = 22+ state with a band crossing at ℏw = 0.37 MeV. Negative parity levels ate also identified.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01297590
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  • 9
    Electronic Resource
    Electronic Resource
    Analysis of radioactive metal ions in environmental and liquid effluent samples (1998)
    Springer
    Journal of radioanalytical and nuclear chemistry 228 (1998), S. 5-13 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract This paper describes the development and validation of analytical procedures for the separation and determination of90Sr,90Y,238Pu,239/240Pu,241Am,241Cm and243/244Cm in liquid effluents and environmental samples. The procedures use supported reagents for extraction chromatography (reversed phase partition chromatography) that enable the separation of the analytes from a large number of other radionuclides present.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02387291
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  • 10
    Electronic Resource
    Electronic Resource
    High-resolution, low-voltage SEM for true surface imaging and analysis (1995)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 353 (1995), S. 378-382 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract A novel design concept for the electron optical column has been implemented in the realization of a new ultra-high performance SEM. A compound magnetic/electrostatic objective lens is at the heart of the high-performance column: the imaging aberrations of this new lens type decrease with decreasing beam energy. Any beam cross-over between the electron source (Schottky FE-gun) and the sample has been eliminated in order to avoid broadening of the beam energy spread (Boersch effect). A high beam energy is maintained throughout the column regardless of the electron probe energy selected by the operator. This protects the beam against the effect of stray fields and minimizes any loss of beam brightness due to stochastic electron-electron interactions. The new SEM achieves outstanding resolution, particularly at the low beam energies (3 nm achievable at EPE=1 keV). The secondary electrons emitted by the sample are detected with very high efficiency by an internal annular detector situated above the final lens. Due to the low imaging aberration level, a high current can easily be focused in a very small probe, thus making the new SEM ideally suited for high-resolution, quantitative X-ray analysis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00322073
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