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  • 1
    Electronic Resource
    Electronic Resource
    Leukocyte agglutinins in workers exposed to benzene, toluene and xylene (1973)
    Springer
    International archives of occupational and environmental health 31 (1973), S. 45-50 
    Details
    ISSN: 1432-1246
    Keywords: Leukocyte agglutinins ; Allergy ; Benzene ; Toluene ; Xylene
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary A leukoagglutination test and a cytotoxic test with leukocytes were performed on 76 workers exposed to occupational contact with benzene, toluene and xylene (52 men, 24 women); the possibility of contact with these substances was eliminated in 41 persons in the period directly preceding the examination, and blood samples were collected from 35 persons in the course of the exposure. In the first group the presence of leukocyte agglutinins for autologous leukocytes was found in only one person and in the second group in 10 persons. The increase of leukoagglutination titer of sera after their incubation with benzene, toluene or xylene was also demonstrated. This suggested the occurrence of allergic blood dyscrasia in some persons exposed to benzene and its homologues.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00538972
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Faunal relationships to abiotic factors along the River Dan in northern Israel (1992)
    Springer
    Hydrobiologia 246 (1992), S. 69-82 
    Details
    ISSN: 1573-5117
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A 4.5 km section of the River Dan in northern Israel was sampled at intervals of 6 weeks, between April 1983–March 1984, using standardized mesh bags. The river is characterized by extremely stable temperature and other physical and chemical conditions. The effects of a water diversion project 2400 m from the spring were investigated. The relationships between fauna and depth, current velocity and distance from the spring sources were evaluated. Of 48 common taxa analyzed, 27 showed relativity to the distance from the sources, 18 to current velocity and 12 to depth. The lowest density of invertebrates, but the highest number of taxa and highest variety of species were found at the spring sources. The sampling site immediately downstream from the water diversion project was characterized by intermediate densities, lowest varieties of species and highest evenness of distribution. Results are compared with the predictions of the Intermediate Disturbance Hypothesis; but the influence of invertebrate drift caused this hypothesis to be inapplicable to lotic waters. Invertebrate drift is in addition suggested as an important factor governing the structure of the fauna at the spring sources.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00005623
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Relationship between current velocity, depth and the invertebrate community in a stable river system (1993)
    Springer
    Hydrobiologia 263 (1993), S. 163-172 
    Details
    ISSN: 1573-5117
    Keywords: Invertebrates ; current velocity ; depth preference ; turbulence
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The relationship between invertebrate densities, current velocity and water depth was studied in the Dan River, northern Israel. Maximum current preferences ranged from 5–120 cm sec−1, and depth preferences ranged from 5–60 cm. Thirty-five taxa of invertebrates were collected by means of colonization cages. Larval and adult stages of 3 Elmidae (Coleoptera) species were treated separately: Limnius letourneuxi, Grouvellinus caucasicus and Elmis rioloides. Differences in current preference were observed between larval and adult stages of the same species of Elmidae. Taxa were also grouped according to preference for turbulence. Wide ranges of depth and current velocity preferences were observed. Most of the taxa were found at between 80–100 cm sec−1 and at depths of less than 30 cm. A correlation between species diversity and current velocity was established. Velocities of 60–80 cm sec−1 contained the greatest overlap of faunal preference. The sensitivity of selected species to stream flow reduction is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00006267
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    Paper (German National Licenses)
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