Organic and inorganic acids as the stimulus for exsheathment of infective juveniles of nematodes |
| |
Authors: | T Petronijevic W P Rogers R I Sommerville |
| |
Affiliation: | 1. 20 Deer Stalker Path, Monterey, CA 93940, USA;2. East Carolina University, NC, USA |
| |
Abstract: | Petronijevic T., Rogers W. P. and Sommerville R. I. 1986. Organic and inorganic acids as the stimulus for exsheathment of infective juveniles of nematodes. International Journal for Parasitology 16: 163–168. A variety of organic and inorganic acids stimulated exsheathment of infective juveniles of Nematospiroides dubius over the range pH 2–7. Activity, in relation to pK values, suggests that the undissociated form of the acid was the active agent. Under normal conditions of exposure, exsheathment of infective juveniles of Haemonchus contortus was not obtained below pH 6, and at higher pH values activity was low except in the presence of CO2 at pressures >9-5 kPa in the gas phase. Brief exposure to HCl at concentrations up to 2N did not induce exsheathment but in the presence of CO2 in the gas phase, 95.3 kPa, activity was obtained in 0-O1N HCl when the times of exposure were 3–25 min.The differences in the responses of N. dubius and H. contortus to a stimulus at low pH values may be attributed to the stability of the exsheathing enzyme of N. dubius in acid media as well as to the relative sensitivity of the two species to stimuli generally. |
| |
Keywords: | |
本文献已被 ScienceDirect 等数据库收录! |
|