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Year 1987, Volume 21, Issue 5
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Issue 1
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Long-term prognosis of the state of nidi and sick rate with tick-borne encephalitis. P. 605-611.
On the basis of literary data and results of the author's investigations in the Krasnoyarsk Territory a method of three-stage long-term prognosis of the state of nidi and sick rate with, tick-borne encephalitis was suggested. The first stage, territorial extrapolational prognosis, is carried out in cases when long-term prognosis for unknown in epizootic and epidemiological respect territories is required. A map of epizootological and epidemiological zonation serves as a formal materialization of territorial extrapolational prognosis. The second stage, long-term expert extrapolational prognosis of tendencies in natural development of nidi or sick rate, is based on the retrospective evaluation of the development of nidi or sick rate in the past and extrapolation of revealed regularities for the future. The third stage, expert prognosis of antropogenic effect on the state of nidi and sick rate, is carried out in the case of the forthcoming transformation of landscapes under the effect of antropogenic factors.
in Russian
A new species of mosquitoes, Aedes (Ochleronatus) intermedius sp. n. (Diptera, Culicidae). P. 612-619.
The description of female, male genitalia and 4th stage larva of a new species of mosquitoes, Aedes (Ochlerotatus) intermedius sp. n. is given. The species was recorded in the USSR from the Middle Volga region in the west to South-East Transbaikalia in the east, being confined mainly to the steppe zone of East Siberia. However, it is possible that the species is spread in the west up to Scandinavian Peninsula and in the east occurs also in Mongolia and North China. The differential diagnosis and data on the biology of Ae. intermedius are given. The species occupies as if an intermediate position between Ae. leucomelas and Ae. implicatus because its adults resemble very much the former, male genitalia — the latter and larvan — both these species. These three species and Ae. cataphylla form the leucomelas subgroup of the communus group of Aedes (Ochlerotatus) of the Palearctic fauna. In the south of East Siberia Ae. intermedius is the most abundant species of mosquitoes at the beginning of the season of their activity.
in Russian
Specific composition of the fauna of parasite coenosis of gerbils. P. 620-627.
Complex studies of parasite coenosis of four species of gerbils were carried out in Turkmenia. Over 60 forms of parasites were found out as follows: three species of blood parasites, 12 species of Coccidia, 8 species of cestodes, 12 species of nematodes, one species of acanthocephals, three species of chigger mites, 15 species of gamasids, 6 species of ixodids, fleas and lice. The list of species of parasites with regard to their hosts is provided.
in Russian
Sexual dimorphism in Ixodes uriae nymphs (Ixodidae). P. 628-636.
The sampling from the natural population of Ixodes uriae has shown that engorged nymphs can be divided with a high degree of probability into future males and females depending on the total length and mass of the body. Morphometric analysis of the scutum, gnathosome and hypostome has revealed reliable differences in sizes of these structures in male and female nymphs that makes possible the identification of hungry nymph sex.
in Russian
Experimental visceral leishmaniosis of golden hamsters. P. 637-642.
As a result of a long passage of L. donovani isolate on golden hamsters (21 passages were observed), in transplanting the agent from animals with a distinct clinical picture there was formed a highly virulent strain "G" of L. donovani for this species of animals. The weight arrest and then body mass losses were the most early signs of the disease. Parasites were regularly accumulated in spleen and liver and to a less extent in bone marrow. The main manifestations of visceral leishmaniosis in hamsters are cachexia, lienal syndrome, polyglandular deficiency on the background of hypoplasia of lymphoid tissue and defects of the system of monocytic phagocytes. Such symptom—complex can be a result of neuroendocrine deficiency during visceral leishmaniosis. Pathohistological picture of experimental visceral leishmaniosis is similar to that of man, so L. donovani infection in hamsters can serve as a model for studies of different medical and biological aspects of leishmaniosis.
in Russian
On the improvement of the methods of helminthological examination of wild animals. P. 643-647.
After having adopted the law on the protection of animal world mass helminthological dissections became inadmissible. Elaboration and use of distance and other merciful methods of investigation are necessary. Coprological examinations of wild animals are hindered by the lack of precise information on the egg structure and larvae of helminths, appropriate atlases and keys. This deficiency should be made up in the nearest future. When dissecting each cadaver of rare or extincting animals its complete parasitological (not only zooparasitological) examination has to be carried out.
in Russian
On a new hypothesis of the origin of diplozoonids (Monogenea, Diplozoonidae). P. 648-653.
The new hypothesis on the origin of diplozoonids from the forms lacking vagina, close in their morphology to recent octomacrids, which was suggested by Khotenovsky and Gerasev, is considered. The author supports the classical view of the fusion of a pair of diplozoonids in the genital opening area "in copula" and direct fusion of the male duct (vas deferens) of one individual with the female duct (vagina) of the other. The reasons that gave rise to the existence of diplozoonids as a couple for the most part of their life and consequences of this unique phenomenon explaining morphological characters of this peculiar group are analysed.
in Russian
Distribution and abundance regulation mechanism in plerocercoids of Triaenophorus nodulosus (Gestoda, Triaenophoridae). P. 654-658.
The character of the distribution of plerocercoids of Triaenophorus nodulosus depending on the host age is shown. Their distribution in perch at the age of 0+—4+is over dispersed in its character and is described by negative binomial. At the age of 5+ to 8+ the distribution of parasites is of regular character that is apparently due to changes in the mechanism of regulation of the parasites number. The regulation mechanism of the number of plerocercoids of T. nodulosus is discussed.
in Russian
Structure and differentiation of the inner egg membrane of Trichocephaloides megalocephala (Cestoda, Dilepididae). P. 659-664.
Electron microscope studies of the inner membrane of developing eggs of T. megalocephala were carried out. At early developmental stages the inner membrane is a syncytial cytoplasmatic layer lying on the basal plate of the embryo. At the preoncosphere stage the division of the membrane into two zones (external and internal ones) takes place. Initially the differentiation manifests itself in the cytoplasm polarisation; at the end of the middle preoncosphere stage the zones are divided by the «oncosphere membrane». The formation of the "oncosphere membrane" is accomplished by the external part of the internal zone. Embryophore is a derivative of the external zone, at the final stages of the formation the embryophore material is transformed from granular into thin-fibrillary. The origin of the external integument of oncospheres of cyclophillids, which, as it has been shown for T. megalocephala, is a derivative of the inner membrane rather than of specialized epithelial oncosphere cells, is considered.
in Russian
Adaptation of Hymenolepis nana to a new host. P. 665-668.
Studies of the inbred lines of mice A/He, AKR and CBA infected with different strains of H. nana have shown that the helminth, when changing the host for another one of the same species but with different hereditary characters, happens to be unsufficiently adapted to the new host. However it does not prevent the start of the infectious process. With increasing number of passages the parasite's adaptation level to the organism of the new host rises gradually. Possibilities and the adaptation level of the agent to the new host are defined as well by the adaptation mechanisms common to each specific strain of H. nana and the host's characters.
in Russian
On synonymy of Anomotaenia microrhyncha (Cestoidea, Dilepididae). P. 669-672.
Repeated studies of Anomotaenia hydrochelidonis Dubinina, 1953 on the material of its first description from the collection of Zoological Institute of the Academy of Sciences of the USSR have shown that this species is a synonym of A. microrhyncha (Krabbe, 1869), a widely distributed parasite of waders. Accordingly, the genus Laritaenia Spassaja et Spassky, 1971 with A. hydrochelidonis as the type species is reduced to synonyms of the genus Anomotaenia Cohn, 1900.
in Russian
Polymorphism of sensillae in Cercaria pugnax, La Valette, 1855 (Trematoda). P. 673-677.
The localization of sensillae on the body and tail of Cercaria is presently attached great systematic importance. Cercaria pugnax, La Valette from Viviparus contectus (M.) was an object of investigations. By means of light microscopy Cercaria was found to have 105 sensillae. 6 types of sensitive formations were observed under the scanning microscope. Depending on their localization the formations differ from each other in shape and size of the sensitive formation itself and in its tegumental collar. The whole complex of different in their shape sensillae alongside with their topography on the body of Cercaria can serve as a good systematic character which has to be used in differentiation of species.
in Russian
Tegument ultrastructure of Opisthioglyphe ranae (Trematoda, Plagiorchidae). P. 677-680.
Tegument ultrastructure of O. ranae from the gut of Rana redebunda has been studied. It has general factures of the tegument of other trematodes.
in Russian
On the vertical migrations of hungry imagos of Dermacentor marginatus. P. 680-683.
The ticks of D. marginatus display activity at a temperature of 3 to 16C and relative humidity of 20 to 75%. At a low temperature higher than 19C their activity is inhibited throughout the whole autumn period at any time of the day. Active appearance of ticks on the stems of vegetation was recorded at 8C and higher in August and the first decade of September (in the morning 16%, in the day time 7.5% and in the evening 74% of ticks become active). As a rule the most high percentage of ticks (56 to 85%) recorded from upper parts of stems was observed in August and first decade of September at evening hours at 12 to 17C and relative humidity of 50 to 70%.
in Russian
Chronicle 1. P. 684-685.
Summary is absent.
in Russian
Chronicle 2. P. 686.
Summary is absent.
in Russian
Book review 1. P. 687-689.
Summary is absent.
in Russian
Book review 2. P. 689-690.
Summary is absent.
in Russian