Reversal of order of ecdysis in Haemonchus contortus (Nematoda).

摘要: Exposure of Haemonchus contortus infective larvae to carbon dioxide under specific conditions is believed activate a succession events that ultimately control both exsheathment and subsequent development the fourth stage. Rarely at pH 6, but always 2, worms fail exsheath yet develop stage surrounded by cuticles two three. Failure probably consequence inactive enzymes in exsheathing fluid, because exposure EDTA, which inactivates reduced yielded sheathed fourth-stage worms. Although blocked CO2 can receptor for as readily 2 6. Therefore hypothesis an early common pathway controls not invalidated.