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장진언,안주현,오창건,임선기 한국공업화학회 1998 응용화학 Vol.2 No.2
The lightly and highly crosslinked polyvinylbenzylchloride (PVBC) copolymers as the gel and macroporous type were prepared by a suspension polymerization method. The porous polymeric adsorbents were produced from these beads by post-crosslinking the copolymer beads with Friedel-Crafts catalysts in a swollen state. The surface area of these adsorbents was obtained by BET method.
Enhanced Production of Biomass and Lipids by Supplying CO2 in Marine Microalga Dunaliella sp.
전한철,이유,장광석,이철균,진언선 한국미생물학회 2013 The journal of microbiology Vol.51 No.6
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.
오한상,이성은,한채성,김준,남온유,서승범,장광석,진언선,황용식 한국조류학회I 2018 ALGAE Vol.33 No.2
Fragilariopsis cylindrus is one of the most successful psychrophiles in the Southern Ocean. To investigate the molecularmechanism of biomineralization in this species, we attempted to synchronize F. cylindrus growth, since new cell wallformation is tightly coupled to the cell division process. Nutrient limitation analysis showed that F. cylindrus culturesrapidly stopped growing when deprived of silicate or light, while growth continued to a certain extent in the absence ofnitrate. Flow cytometry analysis indicated that deprivation of either silicate or light could effectively arrest the cell cycleof this diatom species at the G1 phase, suggesting that synchrony can be established using either factor. Fluorescencelabeling of new cell walls was faintly detectable as early as approximately 6 h after silicon repletion or light irradiation,and labeling was markedly intensified by 18 h. It is revealed that the synthesis of girdle bands begins before valve synthesisin this species, with active valve synthesis occurring during the G2 / M phase. Expression profiling revealed thatselective member(s) of the F. cylindrus SIT genes (FcSIT) respond to silicate and light, with a different set of genes beingresponsive to each factor. The Si / light double depletion experiments demonstrated that expression of one FcSIT gene ispossibly correlated to transition to G2 / M phase of the cell cycle, when the valve is actively formed.