Irma V. Issi

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The ultrastructure of the microsporidian parasite Nosema grylli, which parasitizes primarily fat body cells and haemocytes of the cricket Gryllus bimaculatus (Orthoptera, Gryllidae) is described. All observed stages (meront, meront/sporont transitional stage ("second meront"), sporont, sporoblast, and spore) are found in direct contact with the host cell(More)
Two microsporidian genera, AnncaliiaIssi, Krylova, & Nicolaeva 1993 and BrachiolaCali et al. 1998, possess a Nosema-type life cycle and unique cell surface ornamentations, which include precocious electron-dense coating of the plasmalemma and a variety of secretory structures deposited on the parasite surface and scattered in the host cell cytoplasm.(More)
The current ultrastructural description of Nosema whitei is in agreement with the genus definition of Paranosema [Sokolova, Y.Y., Dolgikh, V.V., Morzhina, E.V., Nassonova, E.S., Issi, I.V., Terry, R.S., Ironside, J.E., Smith, J.E., Vossbrinck, C.R., 2003. Establishment of the new genus Paranosema based on the ultrastructure and molecular phylogeny of the(More)
The life cycle, ultrastructure, and molecular phylogeny of a new microsporidium Crispospora chironomi g.n. sp.n., a parasite of the midge Chironomus plumosus, are described. The parasite infects the gut epithelium of the host larvae and possesses sporogonies of two types, polysporoblastic and disporoblastic, respectively, proceeding within the same host(More)
The presence of 14 enzymes was investigated using purified spores of the microsporidian Nosema grylli from fat body of the crickets Gryllus bimaculatus. Glucose 6-phosphate dehydrogenase (EC 1.1.1.49), phosphoglucomutase (EC 5.4.2.2), phosphoglucose isomerase (EC 5.3.1.9), fructose 6-phosphate kinase (EC 2.7.1.11), aldolase (EC 4.1.2.13),(More)
Microsporidia parasitizing the adipose body of mosquito larvae of Anopheles beklemishevi and Aedes punctor has been studied. Two new genera of microsporidia are described based on lightmicroscopic and ultrastructural characteristics of spores and sporogony stages. The spore wall of Crepidula beklemishevi gen. n. et sp. n. is formed by two-membrane exospore,(More)
Two microsporidians of the genus Amblyospora from mosquito larvae of Aedes and Culex were studied in Tomsk region (Siberia). Peculiarities of the sporogony and the meiospore ultrastructure were studied by light and electron microscopy. The meiospores of A. caspius sp. n. from Aedes caspius and Ae. communis measured on smears, were c. 4.8 x 3.6 microns in(More)
Crepidulospora nom. nov. is a replacement generic name for the genus Crepidula Simakova, Pankova et Issi, 2003 based on the type species Crepidula beklemishevi Simakova, Pankova et Issi, 2003 (Microsporida) from Anopheles beklemishevi. The name proposed by Simakova et al., 2003 is a preoccupied name, because it was already used for the gastropode Crepidula(More)
Three parasitic systems of Microsporidia are described: the system of monoxenic Vairimorpha mesnili with paraxenic hosts presented lepidopteran and hymenopteran species; the system of dixenic Amblyospora sp. with metaxenic hosts presented bloodsucking mosquitoes and crustaceans and the system of Metchnikovella sp. as parasite of other obligate parasite. The(More)