Воздействие катионного амфифильного вещества на коловратокстатья

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Дата последнего поиска статьи во внешних источниках: 26 декабря 2017 г.

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[1] Остроумов С. А., Вальц Н., Руше Р. Воздействие катионного амфифильного вещества на коловраток // Доклады Академии наук. — 2003. — Т. 390, № 3. — С. 423–426. Воздействие катионного амфифильного вещества на коловраток // Доклады РАН (ДАН) 2003. т. 390. № 3. С.423-426, таб. Библиогр. 15 назв. [Совместно: С.А.O., Вальц Н., Руше Р.]. Представлено академиком. В.Л. Касьяновым [ПАВ ТДТМА 0.5 мг/л ингибировал фильтрационную активность популяции Brachionus calyciflorus при питании водорослями Nannochloropsis limnetica (Eustigmatophyceae 1.5 - 6 мкм)]. *** Перевод на англ. яз.: *** Effect of a cationic amphiphilic compound on rotifers.- Doklady Biological Sciences. 2003 (May). Vol. 390. 252-255, tab. Bibliogr. 15 refs (in Eng.; ISSN 0012-4966. Distributed by Springer, orderdept@springer-sbm.com). Welfare of the biosphere depends on filter-feeders that contribute to making water clean and transparent. Important new facts on the hazard of man-made damage to the beneficial function of rotifers, which are the plankton filter-feeders, were discovered. For the first time, it was found that a chemical pollutant inhibits filtration activity of rotifers. As a chemical pollutant, a representative of synthetic surfactants was studied. The study featured an advanced technique that allows a precise measurement of the filtration rate on the basis of measuring the rate of removal of algal cells from water by rotifers. The experiment was run in the following system: the two-species culture of rotifers (Brachionus calyciflorus) and algae (Nannochloropsis limnetica; Eustigmatophyceae) was studied in a two-stage turbidostat (temperature 20 oC) as described by Walz et al. (1997) with some modifications. Dilution rate (the higher the filtration activity of rotifers, the higher the dilution rate) was measured in the turbidostat. As a model of a chemical pollutant, the cationic surfactant tetradecyltrimethylammonium bromide (TDTMA) was added to the water of the turbidostat. On the basis of previous studies (Ostroumov, 2000), the concentration of TDTMA was 0.5 mg/L. Dynamics of the dilution rate before and after addition of the chemical was monitored. The dilution rate decreased after the addition of TDTMA. Also, a comparison of the dilution rate in the experimental turbidostat (with the surfactant) with the control turbidostat (without the chemical) was made. Under conditions of the presence of TDTMA the dilution rate was lower than in the control turbidostat. The lower dilution rate means a lower filtration and grazing activity of the population of the rotifers. The results are in accord with the hypothesis that the cationic surfactant TDTMA can inhibit the filtering activity of populations of rotifers. The results support the conclusions of previous publications, in which analogous effects of surfactants on another major group of filter-feeders (the bottom-dwelling bivalve mollusks) were discovered (Doklady of the Russian Academy of Sciences, 2001, 380, p. 847-849; 2002, vol. 382, p.138-141). [surfactant TDTMA 0.5 mg l-1, turbidostat; the culture of rotifers Brachionus calyciflorus feeding on algae Nannochloropsis limnetica]. [ISSN 0012-4966 (Print) 1608-3105 (Online)]. https://www.researchgate.net/file.FileLoader.html?key=def6575c794b111fcc31275e853c2b15; www.springerlink.com/index/R3126462K122M13T.pdf; DOI 10.1023/A:1024417903077. [In collaboration: S.A.O., Walz N., Rusche R.].

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