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Effect of lead on nitrogenase and enzymes of nitrogen assimilation in a cyanobacterium Nostoc muscorum.
Indian J Exp Biol ; 1991 Dec; 29(12): 1116-9
Article in English | IMSEAR | ID: sea-57060
ABSTRACT
Lead decreased the growth rates, total cell mass, heterocyst frequency, total cell protein, nitrogenase activity, glutamine synthetase (GS) and glutamate synthase (GOGAT) activities in Nmuscorum. However, lead at 0.01 and 10 micrograms ml-1 conc. enhanced nitrogenase as well as GS activity of the cells. On transfer to excess lead (100 micrograms ml-1), nitrogenase and GS activities ceased almost after 24 hr in the cyanobacterium. It is deduced that lead has a two step effect on stimulation and inhibition of metabolic activity at 0.01 and 10 micrograms ml-1 concentration and 0.1 and 100 micrograms ml-1 concentration respectively indicating a close interaction between nitrogen fixation and GS activity. However, GOGAT activity is an exception to this two step stimulation and inhibition process.
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Full text: Available Index: IMSEAR (South-East Asia) Main subject: Cyanobacteria / Glutamate Synthase / Lead / Nitrogen / Nitrogenase Language: English Journal: Indian J Exp Biol Year: 1991 Type: Article

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Full text: Available Index: IMSEAR (South-East Asia) Main subject: Cyanobacteria / Glutamate Synthase / Lead / Nitrogen / Nitrogenase Language: English Journal: Indian J Exp Biol Year: 1991 Type: Article