• Plant Biotechnology Reports
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• 제3권2호
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• pp.135-138
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• 2009

Cell cultures of Cayratia trifolia (Vitaceae), a tropical lianas, were maintained in Murashige and Skoog's medium containing $0.25mg\;1^{-1}$ NAA, $0.2mg\;1^{-1}$ kinetin and casein hydrolysate $250mg\;1^{-1}$. Cell suspension cultures of C. trifolia accumulate stilbenes (piceid, resveratrol, viniferin, ampelopsin), which on elicitation by any of $500{\mu}M$ salicylic acid, $100{\mu}M$ methyl jasmonate, $500{\mu}M$ ethrel and $500mg\;1^{-1}$ yeast extract, added on the 7th day, were enhanced by 3- to 6-fold ($5-11mg\;1^{-1}$) by the 15th day.

• KSBB Journal
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• 제8권4호
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• pp.390-396
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• 1993

Thalicrtrum rugosum 식물세포 현탁배양에 의한 berberine 생산에 미치는 여러 가지 종류의 elicitor들의 영향에 관해 연구 하였다. 효모 유래의 elicitor, 15가지의 서로 다른 종류의 무생물 종류 elicitor, 3가지 곰팡이로부터 얻은 elicitor 들을 처리하여 세포의 생장 및 berberine 생산에 미치는 영향을 비교 분석해 본 결과, 이들 elicitor들은 T. rugosum에 의한 berberine 생산을 크게 증대시키지 못함을 확인하였다.

• 식물조직배양학회지
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• 제27권1호
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• pp.47-50
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• 2000

당류의 수송속도는 당류 고갈동안 증가되었고, 당류 고갈 3일째에 최대 수송속도를 보였다. 당류 고갈로 유도된 당류 수송계는 cycloheximide에 의해서 완전히 방해되었다 선천적으로 식물에서 당류 수송계는 하나이나 당류 고갈동안 유도된 포도당 수송은 포화상태를 보이고, 설탕 수송은 포화되지 않았다. 유도된 당류 수송계는 선천적인 당류 수송계와는 다른 kinetic을 보였다. 이 결과는 고등식물도 불리한 조건하에서 새로운 수송계를 유도시킬 수 있는 능력이 있음을 보여주었다.

• Journal of Plant Biotechnology
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• 제47권3호
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• pp.227-234
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• 2020

벼(Oryza sativa L.)에서 세포 현탁 배양을 통한 miraculin 단백질의 생산을 위해 miraculin 유전자(AB512278)가 도입된 Agrobacterium tumefacience EHA105를 매개로 벼 캘러스에 형질전환하였다. 현탁배양세포주는 형질전환 캘러스를 이용하여 몇번의 선발과정 및 계대배양을 통해 선발하였고, 게놈 PCR 분석을 통해 miraculin 유전자가 벼 염색체에 안정적으로 도입된 것을 확인하였다. 또한, RT-PCR 분석을 통해 형질전환 세포주에서 도입된 miraculin 유전자가 과발현 되었다. 재조합 miraculin은 형질전환 현탁배양 HK-2 세포주에서 가장 높게 발현되어 total soluble protein (TSP) 대비 2.0%를 보였다. 이러한 결과는 형질전환 현탁세포배양이 miraculin과 같은 미각 수식 단백질의 대량생산 시스템을 구축하는데 이용 가능 할 것으로 사료된다.

• 한국생물공학회:학술대회논문집
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• 한국생물공학회 2001년도 추계학술발표대회
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• pp.95-98
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• 2001

The effect of stabilizing polymer on hGM-CSF production was investigated in suspension cell cultures of transgenic tobacco. Secreted human GM -CSF from cell suspension cultures was detected in the medium at a maximum concentration of 180 ${\mu}g/L$ by ELISA. However, the secreted hGM -CSF was unstable in the medium, and rapidly degraded after day 5. In order to stabilize the secreted hGM-CSF, three stabilizing polymers were tested, polyethylene glycol, polyvinylpyrrolidone and gelatin. Gelatin was the most effective in stabilizing the secreted GM-CSF. Following the addition of 5% (w/v) gelatin, the maximum GM -CSF concentration reached 783 ${\mu}g/L$, a 4.6-fold increase over control.

• 한국식물학회:학술대회논문집
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• 한국식물학회 1995년도 식물학심포지움 식물로부터 유용 2차대사산물의 생산 PRODUCTION OF USEFUL SECONDARY METABOLITES FROM PLANTS
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• pp.40-56
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• 1995

During the past two decades, China has seen her great progress in plant biotechnology. Since the Chinese market of herb medicine is huge, while the plant resources are shrinking, particular emphasis has been placed in plant tissue and cell cultures of medicinal plants, this includes fast propagation, protoplast isolation and regeneration, cell suspension cultures and large scale fermentation. To optimize culture conditions for producing secondary compounds in vitro, various media, additives and elicitors have been tested. Successful examples of large scale culture for the secondary metabolite biosynthesis are quite limited : Lithospermum ery throrhizon and Arnebia euchroma for shikonin derivatives, Panax ginseng, P. notoginseng, P. quinquefolium for saponins, and a few other medicinal plants. Recent development of genetic transformation systems of plant cells offered a new approach to in vitro production of secondary compounds. Hairy root induction and cultures, by using Ri-plasmid, have been reported from a number of medicinal plant species, such as Artemisia annua that produces little artemisinin in normal cultured cells, and from Glycyrrhiza uralensis. In the coming five years, Chinese scientists will continue their work on large scale cell cultures of a few of selected plant species, including Taxus spp. and A. annua, for the production of secondary metabolites with medicinal interests, one or two groups of scientists will be engaged in molecular cloning of the key enzymes in plant secondary metabolism.

• Journal of Plant Biotechnology
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• 제3권2호
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• pp.107-112
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• 2001

The kinetics of Ti-transformed Salvia miltiorrhiza cell cultures was studied in 250-$m\ell$ shake flasks by using B5 medium with addition of 30 gfL of sucrose. In the cell cultures, the maximum cell mass obtained was 11.5 g DW/L on day 15. The highest amount of phenolic compounds - rosmarinic acid (RA) and lithospermic acid B (LAB) reached 871.3 mg/L (day 15) and 121.3 mg/L (day 13), respectively. The total tanshinone production, i.e., intracellular plus extracellular cryptotanshinone, tanshinone 1, and tanshinone IIA, was 5.3 mg/L on day 13. For the cultivations in 2.4-L stirred bioreactors, the residual sugar level and medium conductivity were a little higher in a small turbine impeller reactor ($T_s$) than those in a large turbine impeller reactor ($T_L$), while a higher cell density was obtained in the $T_L$. For the production of tanshinones and phenolics, better results were obtained in the $T_L$ than in the $T_s$. In the $T_L$, similar or even a little higher production titers of tanshinones and phenolic compounds were achieved compared to those in the flasks. The results suggest that the shake flask results could be successfully scaled up to the $T_L$ reactor. Such a large impeller reactor like $T_L$ may be better than a small impeller one for the large-scale production of the valuable metabolites by the suspension cultures of Ti transformed S.miltiorrhiza cells. This is considered due to the beneficial culture environment in the $T_L$, such as low shear rates as estimated theoretically.

• 생약학회지
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• 제40권1호
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• pp.13-17
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• 2009

It was previously reported that yeast elicitor transiently increased oleanolic acid and ursolic acid in Scutellaria baicalensis suspension cultures and also doubled phospholipase $A_2$ ($PLA_2$) activity. Thus, $PLA_2$ was purified from the soluble fractions of S. baicalensis suspension cultures and the characters of the purified $PLA_2$ were identified. The $PLA_2$ was purified about 160 times compared with the starting soluble-protein extract from S. baicalensis suspension culture cells. The purified protein showed a molecular mass of about 43 kDa by SDS-PAGE. The purified plant $PLA_2$ had a neutral pH optimum (pH 7.0) and required $Ca^{2+}$ for activity. The $PLA_2$ activity was inhibited by mammalian $PLA_2$ inhibitors such as 5,8,11,14-eicosatetraynoic acid(ETYA) and arachidonyl trifluoromethyl ketone ($AACOCF_3$).

• Journal of Plant Biotechnology
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• 제6권4호
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• pp.265-268
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• 2004

Cell growth and ginseng saponin production by large-scale suspension (bioreactor) cultures of Panax ginseng were investigated under various inoculum sizes. Cell growth was low at an inoculum size of 40 g FW/L, and the maximum cell growth was obtained with increasing inoculum size up to 100 g FW/L. The cell density of 333 g FW/L and 12.7 g DW/L was obtained at inoculum size of 100 g FW/L after 30 days of cultivation. Maximum saponin production of $4.40\;\cal{mg/g}$ DW was achieved at 60 g FW/L of inoculum size. Thus, inoculum size 60 g FW/L was suitable for optimum biomass accumulation as well as saponin production during bioreactor cultivation of ginseng suspension cells.

• Journal of Plant Biotechnology
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• 제5권2호
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• pp.131-135
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• 2003

Callus and cell suspension cultures of Eurycoma longifolia Jack were initiated from leaves of different trees. The leaf explant of tree Eu9 produced the most calli and also induced high cell biomass in the cell suspension culture. Optimum production of cell biomass could be initiated in proliferating culture medium with a pH of 5.75 prior to autoclaving. The effects of macronutrient inorganic salts of Murashige and Skoog (MS) liquid medium supplemented with X on production of cell biomass of Eurycoma longifolia were also investigated. The highest cell biomass was produced in MS medium containing macronutrients of $21\;mM\;NH_4NO_3,\;12.25\;mM\;KNO_3,\;3.00\;mM\;CaCl_2.2H_2O,\;0.575\;mM\;MgSO_4.7H_2O$, and $1.83\;mM\;KH_2PO_4$. A new medium labeled as TAM was formulated for the production of Eurycoma longifolia cell biomass in the cell suspension culture.