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  • 1
    ISSN: 1432-0738
    Keywords: Key words Organochlorine pesticides ; Cultured oviductal and uterine cells ; DNA synthesis ; Estrogen receptor ; Bovine
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract  The pesticides DDT, MXC and γHCH at concentrations between 41 and 200 μM inhibited DNA synthesis (measured by [3H]thymidine incorporation) of cultured bovine oviductal endosalpingeal and uterine cells in the order DDT〉MXC〉γHCH, in comparison to nonexposed controls. Sensitivity to the toxicants was greater in uterine epithelial and stromal cells than in uterine smooth muscle or oviductal endosalpingeal cells. Besides the inhibitory effect, there was a stimulatory effect on DNA synthesis in epithelial cells in the range of 28 nM to 2.8 μM DDT and in stromal cells at 2.8 and 28 nM for MXC. An explanation for this reaction could be that both toxicants have an estrogen-like effect. In the present study, it is shown that the o,p’ isomer of DDT can bind to the cytoplasmatic estrogen receptor and DDT or MXC were able to inhibit the binding of radiolabelled estradiol to the uterine endometrial explants in bovine, whereas γHCH did not change the binding. These findings represent an estrogenic effect of DDT and MXC in two complete in vitro systems.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Archives of gynecology and obstetrics 246 (1989), S. 181-187 
    ISSN: 1432-0711
    Keywords: Early pregnancy factor ; Rosette inhibition test ; Polyclonal anti-lymphocyte serum ; Monoclonal antibody
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary We tested for early pregnancy factor (EPF) using a rosette inhibition test with polyclonal anti-lymphocyte serum from the horse and two monoclonal antibodies specific for the E-receptor of T-lymphocytes. When lymphocytes were preincubated with early human pregnancy sera, rosette inhibition titres were four or more dilutions higher (P〈0.01) than when lymphocytes were preincubated with nonpregnant sera.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    European food research and technology 141 (1969), S. 260-274 
    ISSN: 1438-2385
    Source: Springer Online Journal Archives 1860-2000
    Topics: Process Engineering, Biotechnology, Nutrition Technology
    Description / Table of Contents: Zusammenfassung Nisin ist gegenüber einer Hydrolyse durch Trypsin, Subtilisin A und durch Proteinasen ausAspergillus oryzae u.Aspergillus parasiticus äußerst resistent: In 60 min bei 37°° C wird nur etwa 1 Bindung/mol gespalten (Enzym/Nisin-Verhältnis 2 : 100). Die Aktivität von Nisin gegenMicrococcus flavus wird selbst bei 20 Std Einwirkung durch die genannten Proteinasen und auch durch α-Chymotrypsin, Pepsin und Papain nicht beeinflußt.
    Notes: Summary It has been shown that nisin is very resistant against the action of trypsin (60 min, 37° C incubation temperature; enzyme: substrate ratio 2: 100). About 0,7 bonds/mol were cleaved whereas 9 lysyl bonds were assumed from the quantitative estimation of amino-acids in nisin (mol wt 7000). Hydrolysis of nisin by Subtilisin A and proteases ofAspergillus oryzae andAspergillus parasiticus gave similar results (about 1 bond cleaved pro mol). Activity of nisin againstMicrococcus flavus was not influenced by incubation (2 respectively 20 h, 37° C) with the above-mentioned proteases and with α-chymotrypsin, pepsin, papain, and α-,β-amylases.
    Type of Medium: Electronic Resource
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