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  • 1980-1984  (2)
  • 1950-1954  (2)
Datenquelle
Materialart
Erscheinungszeitraum
Jahr
  • 1
    Digitale Medien
    Digitale Medien
    Factors influencing particle selection and feeding rate in the polychaete Cistenides (Pectinaria) gouldii (1982)
    Springer
    Marine biology 71 (1982), S. 33-40 
    Details
    ISSN: 1432-1793
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract Feeding behavior of the deposit feeding polychaete Cistenides (Pectinaria) gouldii was examined to determine factors affecting particle selection and feeding rate. Worms were found to select large particles preferentially and particle size selection increased with worm size. Particle selection behavior was unaffected by changes in sediment bacterial abundance. Feeding rates were affected by sediment size, bacterial density and worm size. Generally feeding rates increased in sediment containing more food, although the response was worm size specific. When viewed in a theoretical construct these results were inconsistent with predictions of deposit feeder optimal foraging models. Alternative explanations, such as morphological constraints placed upon the polychaete, may explain C. gouldii feeding behavior.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00396990
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  • 2
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    Concerning Allegedly Necessary Nonanalytic Propositions (1951)
    Minneapolis : Periodicals Archive Online (PAO)
    Philosophical Studies. 2 (1951) 17 
    Details
    ISSN: 0031-8116
    Thema: Philosophie
    URL: http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&res_dat=xri:pao:&rft_dat=xri:pao:article:6193-1951-002-00-000005
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  • 3
    Digitale Medien
    Digitale Medien
    In vitro modulation of macrophage tumoricidal activity (1980)
    Springer
    Cancer immunology immunotherapy 7 (1980), S. 225-233 
    Details
    ISSN: 1432-0851
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Summary NaIO4 treatment of mouse adherent peritoneal cells or lymphocyte-free cloned macrophages enhances their cytotoxic and tumoricidal activity. 5×10−3 M NaIO4 treatment of nontumoricidal BCG-activated macrophages renders them completely tumoricidal, whereas the same treatment of stimulated (peptone-normal) macrophages renders them weakly tumoricidal. Addition of LPS in nanogram quantities too low to enhance tumor cell killing by untreated peptone-normal macrophages causes NaIO4-treated peptone-normal macrophages to be maximally tumoricidal. The activating action of NaIO4, MAF, or LPS can be potently, but inconsistently, blocked or reversed by the reducing agent NaBH4 or the aldehyde-reacting agent dimedone. NaIO4 treatment of lymphocyte-free macrophage colonies does not make them cytotoxic, but NaIO4-treated colony macrophages are cytotoxic for tumor cells when cultured in 10 ng/ml LPS (an amount of LPS inadequate to render untreated colony macrophages cytotoxic). Supernatants of NaIO4-treated adherent peritoneal cells contain MAF activity. Thus, the NaIO4-induced enhancement of peritoneal cell tumoricidal activity may result from both direct NaIO4 activating effects on macrophages and indirect NaIO4 effects through NaIO4-induced MAF production.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00205471
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  • 4
    Digitale Medien
    Digitale Medien
    Concerning allegedly necessary nonanalytic propositions (1951)
    Springer
    Philosophical studies 2 (1951), S. 17-21 
    Details
    ISSN: 1573-0883
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Philosophie
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02199417
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