Dictyocaulus viviparus: Migration in agar of larvae subjected to a variety of physicochemical exposures |
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Authors: | Rolf Jess Jørgensen |
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Affiliation: | Institute of Veterinary Microbiology and Hygiene, Royal Veterinary and Agricultural University, Bülowsvej 13, DK-1870 Copenhagen V, Denmark |
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Abstract: | Dictyocaulus viviparus larvae were exposed to ox bile and CO2 at intervals during their cultivation to the infective stage. Preinfective and young infective larvae were stimulated by CO2. Bile slightly inhibited preinfective larvae, but stimulated the infective stage. Old coiled, resting infective larvae were stimulated by bile down to a concentration of 10 ppm of bile dry matter, by vertebrate biles of pig, sheep, newborn calf, cow, guinea pig, dog, and chicken, as well as by defatted bile dry matter and by glyco-, tauro-, glycodeoxy-, and taurodeoxycholates. Continuous bile exposure appeared necessary to maintain high larval activity. A high pCO2 as well as a low redox potential potentiated the effect of bile, but had no effect alone. Exposure to pepsin-HCl and to trypsin had only a minor stimulatory effect. |
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Keywords: | Nematode parasitic Larval triggers Host response Migration agar gel Bile Bile salts Pepsin Trypsin Triggers |
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