期刊
PEERJ
卷 9, 期 -, 页码 -出版社
PEERJ INC
DOI: 10.7717/peerj.11217
关键词
Pure strain; Microalgae-bacterium co-culture; Lipid content; Productivity
资金
- Long Term Research Grant Scheme 1/2018, LRGS [LRGS/2018/USM-UKM/EWS/01]
This study investigated the effect of co-culturing microalgae with a floc-forming bacterium Bacillus infantis. Results showed increased biomass growth and lipid accumulation in the co-culture compared to the axenic culture. The cell number of B. infantis co-cultured with Thalassiosira weissflogii increased during the exponential stage, while other microalgae species experienced a significant reduction in bacteria cell density.
This study investigated the effect of co-culturing microalgae with a floc-forming bacterium. Of the six microalgae isolated from a biofloc sample, only Thalassiosira weissflogii, Chlamydomonas sp. and Chlorella vulgaris were propagated successfully in Conway medium. Hence, these species were selected for the experiment comparing microalgae axenic culture and co-culture with the floc-forming bacterium, Bacillus infantis. Results obtained showed that the co-culture had higher microalgae biomass compared to the axenic culture. A similar trend was also observed concerning the lipid content of the microalgae-bacterium co-cultures. The cell number of B. infantis co-cultured with T. weissflogii increased during the exponential stage until the sixth day, but the other microalgae species experienced a significant early reduction in cell density of the bacteria at the exponential stage. This study represents the first attempt at co-culturing microalgae with B. infantis, a floc-forming bacterium, and observed increased biomass growth and lipid accumulation compared to the axenic culture.
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