AMBIENTUM BIOETHICA BIOLOGIA CHEMIA DIGITALIA DRAMATICA EDUCATIO ARTIS GYMNAST. ENGINEERING EPHEMERIDES EUROPAEA GEOGRAPHIA GEOLOGIA HISTORIA HISTORIA ARTIUM INFORMATICA IURISPRUDENTIA MATHEMATICA MUSICA NEGOTIA OECONOMICA PHILOLOGIA PHILOSOPHIA PHYSICA POLITICA PSYCHOLOGIA-PAEDAGOGIA SOCIOLOGIA THEOLOGIA CATHOLICA THEOLOGIA CATHOLICA LATIN THEOLOGIA GR.-CATH. VARAD THEOLOGIA ORTHODOXA THEOLOGIA REF. TRANSYLVAN
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STUDIA BIOLOGIA - Issue no. 2 / 2010 | |||||||
Article: |
THE EFFECTS OF TEMPERATURE ON GROWTH AND LIPID FATTY ACID COMPOSITION IN CYANOBACTERIUM SYNECHOCYSTIS SP. STRAIN AICB 51. Authors: NICOLAE DRAGOŞ, AUREL MOCAN, CODRUŢA SĂLĂJEAN, ANA NICOARĂ, ADRIANA BICA, BOGDAN DRUGĂ, CRISTIAN COMAN, VICTOR BERCEA. |
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Abstract: The Synechocystis sp. AICB 51 strain is a mesophilic cyanobacterium able to use the inorganic carbon added to the growth medium as NaHCO3. The optimization of the growth factors and the quality of the biomass constituents represent two essential factors for the development of certain applications. The effect of temperature (24-36oC) on the growth process in batch system was studied, as well as the fatty acids composition. The optimal growth temperature is of approx. 30oC, in fluorescent light with 630 μmol∙m-2∙s-1 irradiance. A specific growth rate of 0.8 days-1 and a doubling time of 1.2 days were observed. The gas chromatography analysis of the methyl esters has displayed a profile with a low number of molecular species, the lack of the polyunsaturated fatty acids and a high amount of myristic acid (14:0). The composition variations caused by the growth of the AICB 51 Synechocystis strain in different temperatures (24-36oC) were noticeable, particularly in the supra-optimal interval (33-36oC). An increase of palmitic acid content and a decrease of palmitoleic acid (the dominant monounsaturated acid) were observed in this temperature interval, possibly due to a lowered activity of the temperature-dependent desaturases. Keywords: cyanobacterium, fatty acids, gas chromatography, growth, temperature effects. |
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