Permethrin for head lice.
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The mechanism of permetrin action on two home dust mite species: Dermatophagoides farinae and D. pteronyssinus. Both species turned out to be resistant to permetrin under different conditions of toxicity evaluation. A factor of cuticle permeability was investigated. The impact of monoxygenases and esterases in the permetrin detoxication mechanism was shown. The spectra of esterase complexes of enzymes was examined by means of electrophoresis in PAAG; in addition, the zones of esterase activity were identified with the help of two substrates: 2-NA and ATI. The qualitative differences of the esterase complexes of enzymes of both species were found.
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The African hedgehog, Atelerix albiventris (also known as Erinaceous albiventris; 1,2) has recently undergone an increase in popularity as an exotic pet. This popularity (Beatrix Potter not withstanding) is due in part to the small size of the African hedgehog (adults are 4-6 in in length, weighing approximately 1 lb), its lack of hibernation or aestivation if reared under controlled light and temperature, and its general good nature and accommodation to handling.
The effect of nylon-netting wall-curtains impregnated with 0.5 g permethrin/m2 upon the biting rate of malaria vectors (Anopheles gambiae s.l. and An. funestus) and on the Plasmodium falciparum parasite rate, and morbidity due to malaria in children under five and between five and fourteen years was tested in the Maputo area. The curtains significantly lowered biting rates of both vector species inside curtained houses, but reduced inside resting and outside biting only in An. funestus. The percentage of children with falciparum parasitaemia fell significantly in curtained houses, and among their neighbours. However, parasite load and malaria morbidity in under fives was unaffected but malaria morbidity fell throughout the experimental area in 5 to 14-year-olds. This led to the speculation that malaria vectors inhibited from feeding in the vicinity of the curtains might have gone to feed in the adjacent control area.
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