Effscts of Different Nitrogen Sources on the Growth and Toxin Production of Toxic Dinoflagellate Alexandrium minutum

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Title:	Effscts of Different Nitrogen Sources on the Growth and Toxin Production of Toxic Dinoflagellate Alexandrium minutum 不同氮源對毒藻亞歷山大微藻Alexandrium minutum之生長及產毒性影響
Authors:	呂雅蕙野口玉雄荒川修黃登福
Contributors:	生活應用與保健系
Keywords:	Paralytic shellfish poison Dinoflagellate Nitrogen sources Alexandrium minutum 麻痺性貝毒渦鞭毛藻氮源亞歷山大微藻
Date:	2011-03
Issue Date:	2013-06-20 15:53:01 (UTC+8)
Publisher:	臺灣水產學會
Abstract:	Alexandrium minutum T1 was cultured in four nitrogen sources of nitrate, nitrite, ammonium and urea to study its growth kinetics and toxin production. It is found that A. minutum failed to thrive while using nitrite as sole nitrogen source. In contrast, the maximum specific growth rates of the microalga cultured using nitrate, ammonium and urea as nitrogen sources were 0.24 day^(-1), 0.22 day^(-1) and 0.16 day^(-1), repectively. The utility efficacy of ammonium (Ks=0.028 mM) and urea (Ks=0.034 mM) is better than nitrate (Ks=0.05 mM). In comparison with nitrate, other nitrogen compounds depressed the cell toxicity. From net toxin production rates (Rtox), the toxin production of A. minutum in the exponential growth stage in nitrate medium was higher than that in ammonium, followed by urea and nitrite. The toxin profile was stable and contained GTX1,2,3,4 only in all culture media. Toxins GTX1 and GTX4 were the predominant compounds throughout the growth cycle.
Relation:	台灣水產學會誌 38(1), pp. 67-79
Appears in Collections:	[Dept. of Life and Health Science] Periodical Articles

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