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V F Sapegina 《Parazitologiia》1988,22(2):132-136
The distribution of fleas of small mammals and birds in the nidi of tick-borne encephalitis was analysed. 23 species were recorded from the forest-park zone. Palaeopsylla soricis starki, Amalaraeus penicilliger penicilliger, Megabothris rectangulatus, Ctenophthalmus assimilis, Hystrichopsylla talpae were dominant. They amounted to 90% of the total number of fleas. The greatest species variety of fleas was noted in afforested low-lying parts with rich species composition of hosts. 相似文献
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The four species of fleas associated with birds in West Siberian Plain have been recorded. Ceratophyllus styx is a specific parasite of Riparia riparia. Ceratophyllus garei, C. gallinae, and C. tribulis parasitize various setting of birds. 相似文献
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Following ectoparasites have been recorded on the zokor in the Northern Altay: specific fleas--Ctenophthalmus dilatatus, Rhadinopsylla ioffi, Brachyctenonotus myospalacis; a flea distributed on various rodents; ixodid ticks--Ixodes crenulatus, I. persulcatus; gamasid mites--Hirstionyssus myosplalacis. The C. dilatatus carried hypopi of acaroid mites. 相似文献
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Data on the species composition of fleas, their abundance and distribution on hosts and on territory are given. Changes in the species composition and abundance of fleas in the latitude and meridional directions are shown. 相似文献
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Mouse L-cell lines (B-82, tk-) were obtained using the stepwise selection method, their aminopterin (AP) resistance being 10(3)-5 X 10(4) times higher than that of parental cells. This resistance increase results from dihydrofolate reductase (DHFR) gene amplification which was determined from the 15-120-fold rise of the enzyme activity and with the cytogenetical techniques. The development and loss of AP resistance have been studied and karyological analysis of the lines obtained carried out. Two types of karyological changes were found in stable DM and HSR cells which correspond to extrachromosomal and intrachromosomal forms of the amplified material organization. Localization of the DHFR gene in HSR was proved using the in situ hybridization technique. Extrachromosomal localization of the amplified genes in DM providing unstable AP resistance is dominant at the early stages of the development of resistance and for a long time. It was demonstrated that DM and HSR can exist in one cell during the prolonged period. DHFR gene copy number in such cells is regulated by a change in the DM number, whereas the HSR size and localization are highly stable. HSR covers 1.7-1.9% of the genome length and 38-40% of the marker chromosome length. The genes localized in HSR provide stable AP resistance. Evidence on some intermediate, relative stabilization of the resistance has been obtained. This stabilization is mediated by temporary integration of DHFR copies into other chromosomal sites, in addition to HSR. 相似文献
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V F Sapegina V A Dorontsova V I Telegin N G Ibleva A K Dobrotvorski? 《Parazitologiia》1985,19(5):370-373
Only one species of ixodid ticks Ixodes persulcatus occurs in the forest-park zone. Conditions of foliage forests with high grass, where occur hosts of all developmental phases of ticks (elks, hares, rodents, insectivores), are most favourable for I. persulcatus. Preimaginal phases of I. persulcatus feed, in general, on dominant species (common shrew, redbacked and narrow-skulled voles, field mouse and northern birch mouse). 相似文献
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V F Sapegina 《Parazitologiia》1976,10(5):397-400
The analysis of the landscape distribution of fleas from small mammals and birds in the southern taiga of Priirtishje is given. According to their abundance and faunistic composition the population of fleas from small mammals can be arranged into four groups: fleas of forest floodland landscape, those of forest-meadow floodland landscape, fleas of settlements and bogs. 相似文献
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