Effects on Phosphorus and pH change of Nostoc calcicola medium on production of poly-β-hydroxybutyrate
Document Type : Original Article
Authors
1 Department of Fishery, Faculty of Fisheries and Environment, Gorgan University of Agricultural Science and Natural Resources, Gorgan
2 Department of Fishery, Faculty of Fisheries and atural Resources, Khazar institute of higher education, Mahmoud Abad
Abstract
A study was conducted, in order to investigate the phosphorus and acidity changes of cyanobacter nostoc calcicula medium on production of poly-β-hydroxybutyrate (PHB). For this purpose, the production rate of this polymer in cyanobacter nostoc calcicula was investigated in different levels of Phosphorus (100, 200 and 400 µg/L) and acidity (5.5, 5.8 and 7) on different days (4, 8 and 12). The results showed that increasing acidity has significant effect on PHB production, so increase acidity from 5.5 to 5.8 lead to increase of polymer production(P<0.05). Also increasing the phosphorus content of medium from 100 to 400 µg/L had significant increase on PHB production (P<0.05). According to the results, acidity 5.8 and 400Micro geram phosphorus were recognize as the best gruop for increasing and aggregation. Due to the fact that dynamics associated with the storage energy of cells, it seems that in gruops with low phosphorus, produce less energy carriers, so the condition created for decomposition and transformation to acetyl coenzyme A, which can reduce the amount production of this polymer in less phosphorus groups.
Keywords
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