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THE POSSIBLE IMPORTANCE OF POLYAMINES IN MARINE MICROALGAL GROWTH $100.00
Authors:  Naoyoshi Nishibori, Shikoku University Junior College, Ojin, Tokushima, Japan
Abstract:
Microalgae give contribution of a large proportion of marine primary production, which supports zooplankton and other living organisms. But sometimes, proliferations of some nuisance and/or toxic microalgal species result in harmful algal blooms (HABs), commonly called ―red tides‖. The occurrences of HABs give negative impacts such as illness and death in humans consuming contaminated food, and damages to fish and shellfish cultures resulting in economic loss. The occurrences of HABs are an increasing problem in the coastal waters around the world (Honjo, 1992, Hallegraef, 1993, Smayda, 1998, Imai, et al., 2006).
The growth of bloom forming algae is primarily affected by abiotic environmental factors such as light, temperature, salinity and concentrations of organic and inorganic nutrients. Some biologically active organic compounds, namely vitamins, nucleic acids and organic matters such as humic substances and soil extracts, also stimulate the growth of bloom forming algae in culture (Iwasaki, 1984, Bradley, 1991, Evans and Trewaves, 1991, Carlsson and Graneli, 1998). Among biologically active organic compounds, polyamines are common cell components which are ubiquitously distributed in organisms and play an important role in cell cycle regulation and growth (Hirshfield, et al., 1970, Cohen, et al., 1984, Cohen, 1998). Consequently, information about the effects of polyamines on algal growth together with the distribution in coastal seawater presumably bring new understanding to the mechanisms of blooms and red tide formation. 


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THE POSSIBLE IMPORTANCE OF POLYAMINES IN MARINE MICROALGAL GROWTH