Journal of Microbiology

Research Support, Non-U.S. Gov'ts

Enhanced Production of Biomass and Lipids by Supplying CO2 in Marine Microalga Dunaliella sp.: Hancheol Jeon , Yew Lee , Kwang Suk Chang , Choul-Gyun Lee , EonSeon Jin; J. Microbiol. 2013;51(6):773-776. Published online December 19, 2013; DOI: https://doi.org/10.1007/s12275-013-3256-9

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Non-food-based biofuel feedstocks are in high demand worldwide. Among the various feedstocks, microalgae are the most promising feedstock for mitigating atmospheric CO2 and producing biodiesel. In this study, various concentrations of CO2, from 0.03 to 12%, were used to investigate their effect on the cell growth, biomass and lipid production and fatty acid composition of Dunaliella sp. in a closed photobioreactor. The results showed that the highest biomass and total lipids, 521 mg/L/d and 40 mg/L/d, respectively, were produced with 5% CO2 aeration during the logarithmic growth phase. The oleic acid (18:1n9c) and elaidic acid (18:1n9t) contents were increased approximately two fold. The physiological responses of Dunaliella sp. at 10% CO2 were similar to those at 5% CO2. Therefore, the present results suggest that 5–10% is a suitable CO2 concentration range for Dunaliella sp. growth to mitigate atmospheric CO2 and increase biofuel production.

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Stabilized and Immobilized Carbonic Anhydrase on Electrospun Nanofibers for Enzymatic CO2 Conversion and Utilization in Expedited Microalgal Growth
Seung-Hyun Jun, Jusang Yang, Hancheol Jeon, Han Sol Kim, Seung Pil Pack, EonSeon Jin, Jungbae Kim
Environmental Science & Technology.2020; 54(2): 1223. CrossRef
CO2 biofixation and fatty acid composition of two indigenous Dunaliella sp. isolates (ABRIINW-CH2 and ABRIINW-SH33) in response to extremely high CO2 levels
Roya Moghimifam, Vahid Niknam, Hassan Ebrahimzadeh, Mohammad Amin Hejazi
Bioprocess and Biosystems Engineering.2020; 43(9): 1587. CrossRef
In situ biological CO2 fixation and wastewater nutrient removal with Neochloris oleoabundans in batch photobioreactor
S. A. Razzak
Bioprocess and Biosystems Engineering.2019; 42(1): 93. CrossRef
Lipid Production by Arctic Microalga Chlamydomonas sp. KNF0008 at Low Temperatures
Eun Jae Kim, Woongsic Jung, Suyoun Lim, Sanghee Kim, Han-Gu Choi, Se Jong Han
Applied Biochemistry and Biotechnology.2019; 188(2): 326. CrossRef
Microalgal Cultivation in Secondary Effluent: Recent Developments and Future Work
Junping Lv, Jia Feng, Qi Liu, Shulian Xie
International Journal of Molecular Sciences.2017; 18(1): 79. CrossRef
Effect of Pulsed Electric Field Treatments on Permeabilization and Extraction of Pigments from Chlorella vulgaris
Elisa Luengo, Santiago Condón-Abanto, Ignacio Álvarez, Javier Raso
The Journal of Membrane Biology.2014; 247(12): 1269. CrossRef

Accumulation of Lipid Production in Chlorella minutissima by Triacylglycerol Biosynthesis-Related Genes Cloned from Saccharomyces cerevisiae and Yarrowia lipolytica: Hsin-Ju Hsieh , Chia-Hung Su , Liang-Jung Chien; J. Microbiol. 2012;50(3):526-534. Published online June 30, 2012; DOI: https://doi.org/10.1007/s12275-012-2041-5

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Abstract: Discovery of an alternative fuel is now an urgent matter because of the impending issue of oil depletion. Lipids synthesized in algal cells called triacylglycerols (TAGs) are thought to be of the most value as a potential biofuel source because they can use transesterification to manufacture biodiesel. Biodiesel is deemed as a good solution to overcoming the problem of oil depletion since it is capable of providing good performance similar to that of petroleum. Expression of several genomic sequences, including glycerol-3-phosphate dehydrogenase, glycerol-3-phosphate acyltransferase, lysophosphatidic acid acyltransferase, phosphatidic acid phosphatase, diacylglycerol acyltransferase, and phospholipid:diacylglycerol acyltransferase, can be useful for manipulating metabolic pathways for biofuel production. In this study, we found this approach indeed increased the storage lipid content of C. minutissima UTEX 2219 up to 2-fold over that of wild type. Thus, we conclude this approach can be used with the biodiesel production platform of C. minutissima UTEX 2219 for high lipid production that will, in turn, enhance productivity.

Acinetobacter oleivorans sp. nov. Is Capable of Adhering to and Growing on Diesel-Oil: Yoon-Suk Kang , Jaejoon Jung , Che Ok Jeon , Woojun Park; J. Microbiol. 2011;49(1):29-34. Published online March 3, 2011; DOI: https://doi.org/10.1007/s12275-011-0315-y

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Abstract: A diesel-oil and n-hexadecane-degrading novel bacterial strain, designated DR1T, was isolated from a rice paddy in Deok-So, South Korea. The strain DR1T cells were Gram-negative, aerobic coccobacilli, and grew at 20-37°C with the optimal temperature of 30°C, and an optimal pH of 6-8. Interestingly, strain DR1T was highly motile (swimming and swarming motility) using its fimbriae, and generated N-acyl homoserine lactones as quorum-sensing signals. The predominant respiratory quinone as identified as ubiquinone-9 (Q-9) and DNA G+C content was 41.4 mol%. Comparative 16S rRNA gene sequence-based phylogenetic analysis placed the strain in a clade with the species A. calcoaceticus, A. haemolyticus, A. baumannii, A. baylyi, and A. beijerinckii, with which it evidenced sequence similarities of 98.2%, 97.4%, 97.2%, 97.1%, and 97.0%, respectively. DNA-DNA hybridization values between strain DR1T and other Acinetobacter spp. were all less than 20%. The physiological and taxonomic characteristics with the DNA-DNA hybridization data supported the identification of strain DR1T in the genus Acinetobacter as a novel species, for which the name Acinetobacter oleivorans sp. nov. is proposed. The type strain is DR1T (=KCTC 23045T =JCM 16667T).

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