[Testing the efficiency of Bacillus thuringien israelesis against mosquito larvae in Uzbekistan]. / Ispytaniia éffektivnosti Bacillus thuringiensis var. israelensis protiv lichinok komarov v Uzbekistane.

Experiments were conducted in the potential and neighboring malarious areas in the flood plains of the Tupalang River in the Sarias District, Surkhandarya Region, Uzbekistan. They have indicated that the numbers of larvae of pp. Culex and Aedes within the first 24 hours after treatment with BTI drastically reduced with all test doses (0.01-5.0 g/m2) and 92.3-100% larval deaths were recorded. At the same time the efficacy of the drugs retained for more than 7 days (100% death), i.e. throughout the observations. The second experiment have shown that all the test dosage forms of BTI drugs against An. superpictus larvae within 5 days after treatment of water reservoirs displayed virtually a 100% efficacy; on day 7, their efficacy slightly decreased, but remained rather high (75.4-99.7%). On day 14, drugs as granules and emulsions showed a noticeable reduction in their efficacy while the efficacy of powder-like drugs was in the range of 64.2-100%. The power-like drug Vectobac WDG in doses of 0.05-0.2 g/m2 exhibited the longest efficacy (87.6-100%). There was a noticeable increase in the numbers of mosquitoes in the control water reservoirs on days 7 and 14 of experiments.

[An evaluation of the possibility of using Romanomermis iyengari Welch mermithids for mosquito control in Uzbekistan]. / Otsenka vozmozhnosti ispol'zovaniia mermitid Romanomermis iyengari Welch dlia bor'by s komarami v Uzbekistane.

Mermithid nematodes Romanomermis iyengari were released into 13 natural water bodies of various types at a ratio of 300-8000 invasive preparasites per 1 m2 of water surface in Tashkent region of Uzbekistan. Infected larvae of Anopheles martinius, An. hyrcanus, Culex modestus were found in 6 water bodies with low content of dissolved salts (Ca2+ + + Mg2(+)-3.8-6.7 mg equivalent/l, Cl(-)-38.3-160.2 mg/l). The infection rates of mosquito larvae were 9-67%. In laboratory tests mermithids infected up to 100% of mosquito larvae of the above-mentioned species as well as An. superpictus and Cx. pipiens from natural populations. Aedes caspius were resistant to mermithid infection. It is expected that in Tashkent region these mermithids can be used only in water bodies with low salt content.

[Structural changes in contractile proteins of muscle fibers studied by polarization ultraviolet fluorescence microscopy. X. The effect of ATP, Ca2+, pH change and ionic strength of the washing solution on the structural state of thick filaments]. / Izuchenie strukturnykh izmenenii sokratitel'nykh belkov myshechnogo volokna s pomoshch'iu poliarizatsionnoi ul'trafioletovoi fluorestsentnoi mikroskopii. X. Vliianie ATF, Ca2+, izmeneniia pH i ionnoi sily omyvaiushchego rastvora na strukturnoe sostoianie tolstykh nitei.

By the method of polarized ultraviolet fluorescence microscopy, effects of ATP, Ca2+, changes in pH and ionic strength of washing solution of the structural state of thick filaments in both actin-free muscle fibers of rabbit and anisotropic discs (A-discs) of glycerinated fibers of crab were studied. The dependence of tryptophan fluorescence anisotropy of thin filaments upon physico-chemical parameters (compounds) of washing solution has been found. The structural state of thick filaments was suggested to be influenced by ATP, Ca2+, changes in pH and ionic strength of washing solution.