title: Unimpaired infectivity of the nematode Haemonchus contortus after freezing for 44 weeks in the presence of liquid nitrogen.
mesh_terms: D000818:Animals; D005243:Feces; D005260:Female; D005615:Freezing; D007814:Larva / Q000254:growth & development / Q000502:physiology; D008297:Male; D009068:Movement; D009584:Nitrogen; D010270:Parasite Egg Count; D012756:Sheep; D014251:Trichostrongyloidea / Q000254:growth & development* / Q000502:physiology
chemical_list: D009584:Nitrogen