By M. R. Droop
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Extra info for Advances in Aquatic Microbiology
The possibility of nitrogen fixation in the dark zone has been usually neglected or considered insignificant. Thus, Stewart et al. (1967) point out, for example, that nitrogen fixation diminishes abruptly with depth in Lake Mendota. However, indications that there are present in the water body organisms potentially capable of nitrogen fixation led Brezonik and Harper (1969) to undertake appropriate observations using the acetylene procedure. Brezonik and Harper (1969) have determined the intensity of nitrogen fixation in two dystrophic lakes, Mary and Mise, situated in two climatic zones.
379. Izdanija N a u k a , Moscow. ) Sokolova, G. A. (1961). Seasonal variations in the specific composition a n d n u m b e r of iron bacteria a n d the iron cycle in lake Glubokoje. Trudy Vsesojusnogo gidrobiologicheskogo obschestva, 1 1 , 5 - 1 1 . Sorokin, Yu. I. (1961). Role of chemosynthesis in production of organic substances in water reservoirs. Investigation of chemosynthesis production in Kuibysher W a t e r Reservoir in 1958-1959. Microbiology, 30, 756-763. ) Sorokin, Yu. I. (1964). O n the trophic role of chemosynthesis in water bodies.
It was necessary to make a quantitative assessment of the intensity of natural biological processes. All these principles of Winogradsky are valid today. Science, however, is rapidly advancing and, despite a large quantity of scientific ballast, puts forward new ideas, improves its research methods and gains deeper insight into the nature of things. Today the time is ripe to pass to the study of biological processes directly in natural environments. Evidently, problems of ecology can be resolved only by conducting a totality of physicochemical studies of the environment, in conjunction with studies of the physiology, biochemistry, morphology and fine structure of organisms and with experiments using radioactive labels or careful chemical assays to follow changes occurring in the environment under the effect of the natural microflora.
Advances in Aquatic Microbiology by M. R. Droop