title: [Differences in the blocking of the proventriculus in male and female Xenopsylla cheopis (Siphonaptera: Pulicidae)].
abstract: Frequency of block formation was studied in Xenopsylla cheopis infected with the triptophan-dependent and the typical strains of Yersinia pestis from the Mountain-Altai natural plague focus. It was shown that the rate of blocked males in comparison with that of females was statistically higher. In experiments with the triptophan-dependent strain the frequency of blocking in males was 40.9% and exceeded that in females at four times. The highest rate of blocked males was marked at 7-10th and that of females at 21st days. The tryptophan-dependent strain did not concede to the typical strain in the ability to form a proventricular block in fleas.
authors.forename: L P
authors.initials: LP
authors.lastname: Bazanova
authors.forename: G A
authors.initials: GA
authors.lastname: Voronova
authors.forename: E G
authors.initials: EG
authors.lastname: Tokmakova
mesh_terms: D000818:Animals; D004064:Digestive System / Q000382:microbiology*; D005260:Female; D007303:Insect Vectors / Q000382:microbiology*; D008297:Male; D051379:Mice; D012727:Sex Characteristics; D012800:Siberia; D005423:Siphonaptera / Q000382:microbiology*; D013997:Time Factors; D015010:Yersinia pestis