Document Details

Document Type : Article In Journal 
Document Title :
HETEROCYST FREQUANCY INFLUENCES TOXIN PRODUCTION IN
تأثير تردد الهتيروسيست (الحويصلة المثبتة للنيتروجين) على انتاج السميات فى الافينيزوةين
 
Subject : toxicity 
Document Language : English 
Abstract : The inverse relationship between available nitrate in the culture media and amount of toxin per cell of blue-green alga Aphanizomenon flos-aquae NH-5 was described. No significant difference in biomass production between nitrogen depleted and non-depleted cultures was found. Heterocysts were separated from the vegetative cells of Aphan. flos-aquae NH-5 by the alteration of ultrasonication power and the toxicity of each preparation was determined by mouse bioassay. Toxin concentration of cultures grown in nitrogen depleted media were significantly higher than cultures grown in complete media for both heterocysts and vegetative cells. Toxin concentration of heterocysts was significantly higher than vegetative cells. Toxin ratio (Saxitoxin to Neosaxitoxin) for heterocysts and vegetative cells in both depleted and complete media was determined by HPLC. No differences were found among all preparations in toxin ratio. This study demonstrated that there is a relationship between the toxin concentration and the type of cell as well as the nitrate concentration in the media. The hypothesis proposed thai there is a positive relationship between toxin concentration and nitrogen fixation activity in the heterocysts. 
ISSN : 12349-76 
Journal Name : Journal of Egyptian Society of Toxicology 
Volume : 19 
Issue Number : 1 
Publishing Year : 1419 AH
1998 AD 
Article Type : Article 
Added Date : Saturday, January 8, 2011 

Researchers

Researcher Name (Arabic)Researcher Name (English)Researcher TypeDr GradeEmail
محمد نصر الدين محمد جمعةGomaa, Mohamed Nasr Eldin mohamedInvestigatorDoctoratemngomaa@gmail.com

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