[Fertility of the flea, Xenopsylla gerbilli Minax, that parasitizes the great gerbil (Aphaniptera)]. / O plodovitosti blokh Xenopsylla gerbilli Minax, parazitiruiushchikh na bol'shoi peschanke (Aphaniptera).

It has been established experimentally that the fecundity of females of Xenopsylla gerbilli minax is wavy in its character from the beginning to end of their reproduction (peaks are replaced by falls). In spring and summer the egg laying proceeds on the 2nd--3rd day after the first bloodsucking of fleas and lasts to the end of their life. In autumn the first eggs develop on the 4th--6th day and do not develop at all at the end of the life. In winter months the egg production is somewhat slowed down but with the coming of spring become more intensive. Progeny obtained from one female during the experiment varies, depending on the conditions of the maintenance, from 20 to 130 individuals.

[The action of a juvenile hormone synthetic analog--ether-farnesol on Xenopsylla cheopis fleas]. / Deistvie sinteticheskogo analoga iuvenil'nogo gormona--éfir-farnazola na blokh Xenopsylla cheopis.

The authors tested the effect of the analogue of juvenile hormone (AJH), ether-farnesol, synthesized at the Institute of Chemistry of the Academy of Sciences of ESSR (the city of Tallin), on immature stages of X. cheopis. When testing the following doses of AJH (0.0025, 0.00025, 0.000025, 0.0000025 ml per lg of substrate, consisting of sand and dry bull blood, for feeding larvae) it was established that the dose of 0.0025 ml/g causes 100% mortality of insects on the 2nd day of the experiment. 10 fold decrease in ether-farnesol dose causes the mortality of the majority of larvae. Only 13.6% of them formed cocoons, which failed to produce mature individuals. A repeated 10 and 100 fold decrease of AJH caused mortality in 50.0 and 46.7% of insects, respectively. The effect of the preparation stipulated the disturbance of the normal course of metamorphosis (changes in the data of phases replacement and the mortality of insects during their moulting).

[Trial of the action of synthetic juvenile hormone analogs on fleas]. / K ispytaniiu deistviia sinteticheskikh analogov iuvenil'nogo gormona na blokhakh.

H-chlorphenyl ether of geraniol (1.5 to 0.05 %) caused the mortality of all preimaginal stages of fleas of the species C. anisus. 0.025 % dose of the preparation broke the normal course of metamorphosis that resulted in the delay of moulting periods of larvae, the formation of cocoons and hatching of imagos. All these deviations reduced the emergence of adults by to 90 %.

[The monitoring of immunological indices in odontogenic abscesses and phlegmons and their differential diagnostic meaning]. / Monitoring immunologicheskikh pokazatelei pri odontogennykh abstsessakh i flegmonakh i ikh differentsial'no-diagnosticheskaia znachimost.

The immune homeostasis parameters have been monitored in 31 patients with odontogenic abscesses and phlegmons. Immunological values possessing differential diagnostic significance have been detected. Activation of phagocytosis, spontaneous and stimulated activity of phagocytes in parallel with a moderate decrease in the cellular functional reserve, increased immunoregulatory index, and moderate shifts in the concentrations of IgG and IgM are characteristic of odontogenic abscesses, while odontogenic phlegmons are characterized by deep depression of the phagocyte function and failure of cellular and humoral immunity. The disorders in the immune functions of patients with odontogenic phlegmons normalized 2 weeks later than in those with odontogenic abscesses. Both diseases run a wave-like course and are characterized by phasic changes in immunological parameters, which is significant for determining pathogenesis and choosing appropriate immunocorrective therapy.

[The action of a synthetic juvenile hormone analog on the flea Xenopsylla skrjabini]. / Deistvie sinteticheskogo analoga iuvenil'nogo gormona na blokh Xenopsylla skrjabini.

In search of effective means of harmful fauna control, which could be practically safe for man and domestic animals, the authors tested efoxen-II, a juvenile insect hormone analogue (JHA) synthesized at the Institute of Chemistry, the Estonian Acad. of Sci. (Tallinn). Experiments were performed with Xenopsylla skrjabini Ioff., 1903 fleas under laboratory conditions. The doses of the drug tested were the following: 0.25.10(-2); 0.25 X 10(-3); 0.25.10(-4); 0.25.10(-5) ml/g per 1 g the substrate consisting of sand and dry bovine blood (for larvae feeding). Juvenile fleas' contact with the drug altered the normal metamorphosis process, thus killing the majority of fleas. The drug given in a dose of 0.25.10(-2) ml/g killed 100% of larvae by the 8th day of the experiment. The drug added to the substrate at 0.25.10(-3) ml/g prolonged metamorphosis stages, some larvae were killed during the moult, others (0.3%) formed pupae and died inside them. Larvae contact with the drug at 0.25.10(-4) and 0.25.10(-5) ml/g resulted in partial death. The insects survived (36.6 and 46.6%, respectively) completed metamorphosis by imago hatching. Thus, the drug tested by the authors proved to be considerably effective and may be recommended for in situ testing.