Timur Yu. Magarlamov

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The cellular composition of the coelomic fluid of the Far Eastern holothurinans Apostichopus japonicus and Cucumaria japonica was studied using light and transmission electron microscopy and histochemistry. In the coelomic fluid of A. japonicus, the following types of coelomocytes were distinguished: progenitor cells; amoebocytes; vacuolated cells; small(More)
The taxonomic composition of bacteria associated with the proboscis worm Cephalothrix simula was studied and screening of the tetrodotoxin (TTX)-producing bacteria was carried out using confocal laser scanning microscopy and polyclonal antibodies. Bacterial isolates were identified using the 16S rRNA gene sequencing and phenotypic characteristics. A(More)
48 The nervous system of nemertean larvae has been studied so far only in pilidia, planktonotrophic larvae of nemerteans of the superorder Pilidiophora [1–3]. In contrast to larvae of other Trochozoa, pilidia do not have apical ganglia, which is regarded by some authors as the initial state of nemerteans [4]. However, it was reported in the literature that,(More)
The lifecycle of the Bacillus sp. 1839 cultivated during a long period on solid and liquid Youschimizu-Kimura medium was investigated, and then bacteria and spores were studied by light and transmission electron microscopy. Sporulation in this strain is distinguished by engulfment of forespore by mother cell. In the liquid medium, bacteria have the(More)
This review is devoted to the marine bacterial producers of tetrodotoxin (TTX), a potent non-protein neuroparalytic toxin. In addition to the issues of the ecology and distribution of TTX-producing bacteria, this review examines issues relating to toxin migration from bacteria to TTX-bearing animals. It is shown that the mechanism of TTX extraction from(More)
The marine Bacillus sp. strain 1839 produces tetrodotoxin-like (TTX-like) compounds during sporulation. In this study, the environmental signals that regulate spore formation and the synthesis of TTX-like substances were examined. The main sporulation trigger for Bacillus sp. 1839 was changes in environmental osmolality. Confocal laser scanning (CLSM) and(More)
Animals with deformed shells and microalgal invasion have been identified in the natural population of the horse mussel species Modiolus kurilensis of Peter the Great Bay in the Sea of Japan. The haemolymph is initially infested with algae, followed by the rectum, siphons, mantles and gonads located in the posterior body areas. Mantles, which are primarily(More)
One hundred strains of halophilic vibrios were isolated from 16 species of marine invertebrates of Peter the Great Bay. Based on their morphological and biochemical characteristics, the bacteria were identified as Vibrio parahaemolyticus and Vibrio alginolyticus. Bacterial isolates possessed virulence enzymes (DNAase, lecithinase, catalase) and were(More)
The ultrastructure of the epidermis of free-swimming larvae of the nemertean Quasitetrastemma stimpsoni was examined. At about 24 hours after hatching, the provisional epithelium of larva is 28–35 μm thick and consists of two layers of cells—peripheral and basal. The peripheral layer consists of multiciliated cells and two kinds of gland cells. The “basal(More)
The proboscis musculature was studied in the nemertean Baseodiscus delineatus using confocal laser scanning and electron transmission microscopy. Three muscle layers were differentiated in the proboscis wall: the outer-longitudinal, the diagonal, and the inner-circular layer. The endothelium consists of two cell types: apical supportive cells with(More)
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