• Journal of the Korean Society of Food Culture
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• v.5 no.4
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• pp.449-453
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• 1990

This study was designed to illuciate the effect of ginseng saponin on the growth of Bacillus cereus 425. The bacteria was cultured in the broth medium treated with ginseng saponin. The result is as follows : The binding experiment was tried to see relationship between the growth stimulation and increased nutrient absorption. The result showed that stimulation of glucose binding especially, increased cell growth. The ginseng saponin stimulated the cell growth showed a significant increase of acid phosphatase and alkaline phosphatase activities.

• Transactions of the Korean Society of Mechanical Engineers B
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• v.34 no.1
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• pp.83-87
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• 2010

We present here the effect of extracellular matrix (ECM) on the proliferation and physiology of HL-1 cardiac cells. HL-1 cell is from AT-1 mouse atrial cardiomyocyte tumor lineage. HL-1 cell can be serially passaged, yet they maintain the ability to contract which is a promising character of HL-1 cell for the cell based biosensors. HL-1 cells grow up on the ECM which can affect on the attachment and growth of HL-1. In this paper, we discuss HL-1 cell-ECM interactions with three different ECMs and non-treated surface. HL-1 cells are grown for 4 days after seeding then observed their attachment. Also they were immunostained by hoechst and EthD-1 for proliferation, phalloidin for Factin, and DAPI for nuclei. Fibronectin was revealed as the proper ECM material for HL-1 cell culture. This study can provide basic information for understanding the cell-ECM interactions and growth of HL-1 cells.

• Journal of Life Science
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• v.22 no.4
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• pp.492-498
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• 2012

To investigate whether phytochemicals affect cancer cell viability, human colorectal HCT116 cells were treated with four different phytochemicals. Among these phytochemicals, curcumin is the strongest inhibitor of cell proliferation. In addition, it decreased cell viability in a dose-dependent manner. To unveil the molecular mechanisms involved in the inhibition of cell proliferation by curcumin, we carried out oligo DNA microarray analysis. We found that 137 genes were up-regulated more than 2-fold, and 141 genes were down-regulated more than 2-fold by 25 ${\mu}M$ curcumin treatment. Among the up-regulated genes, we selected 3 genes (ATF-3, GADD45A, and NR4A1) to confirm microarray data. The results of RT-PCR strongly agreed with those of the microarray data. Among the phytochemicals used in this study, curcumin is the strongest inducer of ATF3 expression, and increased ATF3 expression in a dose-dependent manner. Interestingly, FACS analysis showed that the inhibition of cell growth by curcumin was recovered by ATF3-siRNA transfection. Finally, we detected the changes of gene expression by ectopic expression of ATF3. The results indicated that many up-regulated genes were related to apoptosis. Overall, these results suggest that ATF3 may play an important role in the anti-proliferative activity of curcumin in human colorectal cancer cells.

• KSBB Journal
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• v.10 no.3
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• pp.323-334
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• 1995

The effects of glucose on cell growth kinetics, monoclonal antibody productivity, and cell metabolism or hybridoma cells were investigated. The mouse-mouse hybridoma cell line VIII H-8 producing mouse IgG2a was used as a modal system. Glucose showed substrate inhibition type dependence on specific growth raie. The maximum cell density increased as initial glucose concentration increased up to 4 g/$\ell$. Glucose showed a strong influence on cell death kinetics, and an inverse relationship between specific death rate and glucose concentration was found. Cell viability and monoclonal antibody production increased as initial glucose concentration increased. The specific glucose consumption rate increased with glucose concentration, and cumulative specific lactate production rate increased with increasing initial glucose concentration. The overall kinetics of ammonium ion production was almost invariant with respect to initial glucose concentration, while the cumulative specific ammonium ion production rate was dependent on initial glucose concentration.

• KSBB Journal
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• v.10 no.4
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• pp.455-460
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• 1995

Specific growth rate was controlled for the repression of acetic acid formation in the fed-batch fermentation of recombinant Escherichia coli. With controlled specific growth rate, we studied the effect of the specific growth rate on cell growth, glucose consumption, acetic acid formation, and the expression of recombinant protein (${\beta}$-lactamase). High specific growth rate caused the accumulation of glucose and acetic acid, and lowered the production of recombinant protein. However, the addition of methionine recovered the gene expression by alleviating the negative effect of acetic acid at high specific growth rate.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.21 no.11
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• pp.70-77
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• 2020

Microalgae are independent organisms that perform photosynthesis and can alter the culture environment to increase accumulation of useful substances derived from microalgae. In this study, cell growth was measured by incubation for 39 days using MBBM, Neo medium, and seven light sources, which is the main factor affecting cell growth of microalgae S. obliquus. In the case of S. oliquus, which grew in MBBM and Neo medium, cell growth was highest under fluorescent light sources and Red2 LED (R660) light sources, and cell growth was lowest under Infra Red LED (R741) light sources. The average cell growth rate was 17.7% for MBBM and 15.4% for Neo. Comparing the effects of dry cell weight of Neo medium containing nutrients on the production of aquatic plants, MBBM and dry cell weight of Neo resulted in higher cell growth than Neo medium under all LED light sources except for Blue LED (B450). This proves that MBBM is more suitable for increasing the cell growth of microalgae than Neo medium and confirms that light source selection is important in the production of useful materials through mass cultivation of microalgae in the future.

• KSBB Journal
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• v.8 no.5
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• pp.446-451
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• 1993

In ethanol fermentation, by-products such as glycerol, acetic acid and lactic acid are produced along with ethanol. The effects of culture conditions on cell growth ethanol production and by-products biosynthesis were investigated in ethanol fermentation using S. cerevisiae. With increasing aeration rate or yeast extract concentration, ethanol and by-products biosynthesis decreased while final cell mass increased. With increasing glucose concentration or decreasing temperature, final cell mass, ethanol and by-products concentrations all increased. The optimal pH for the cell growth, ethanol and by-products productions was found to be pH 4.5. By-products biosynthesis was found, in general, to proceed with the ethanol biosynthesis. The results can be applied for the optimization of ethanol fermentation and for the recovery and purification of ethanol from the culture broth.

• Proceedings of the Korean Nutrition Society Conference
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• 2002.05a
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• pp.60-67
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• 2002

락토페린은 주로 유즙에 많이 포함되어 있으며 인간 분비물 등에서도 발견되는 당단백질로써, 미생물 감염에 대한 방어작용이 있는 것으로 알려져 있다. 락토페린의 미생물에 대한 방어작용은 미생물 성장에 필요한 철이온이 락토페린에 결합하여 성장을 저해하기 때문인 것으로 알려져 있다. 락토페린은 이외에도 염증반응의 조절, 임파세포의 성장촉진 등 면역반응에도 관여하는데 이러한 활성은 철에 결합하는 성질과는 무관하게 일어나며 락토페린이 DNA에 결합하는 성질과 관련이 있는 것으로 추측되어진다. 락토페린은 DNA에 결합하여 유전자의 전사에 관여할 것으로 여겨지는데 그 동안 어떤 유전자의 발현에 관여하는지에 대해서 알려진 바가 없었다. 최근 본 연구팀은 락토페린이 포유세포의 세포유전자의 전사에 관여하는지를 분석한 결과 락토페린 결합부위를 가지고 있는 유전자중의 하나인 인간 인터루킨-1$\beta$ 유전자의 전사를 활성화시킨다는 연구 결과를 보여 주었다. 인간 myelogenous leukaemia 세포주인 K562 세포를 락토페린과 phorbolmyristate acetate(PMA)로 함께 처리하면 K562 세포의 인터루킨-1$\beta$ mRNA의 양은 PMA 단독으로 처리하였을 때 보다 상승적으로 더 많이 유도됨을 보여주었다. 또한 IL-1$\beta$/Luciferase 융합 유전자를 K562 배양세포에 넣어 전사 활성을 비교함으로써 락토페린에 의한 인터루킨-l$\beta$의 전사활성을 확인하였다. 락토페린을 전체, N-말단, 혹은 C- 말단 부위를 COS-1 세포에 발현시켜 전사 활성을 측정한 결과 C-말단 쪽은 전사활성이 없었으나 N-말단 90개 아미노산 부위(NIa라 명명)가 전사활성을 가지고 있음을 규명하였다. 본 연구결과는 락토페린이 인터루킨-l$\beta$의 유전자의 전사에 역할을 하고 있음을 보여 주고 있으며 또한 인터루킨-1$\beta$의 유전자 외에도 락토페린 결합 부위를 유전자의 조절부위에 포함하고 있는 세포 유전자의 전사도 관여할 수 있음을 제시하고 있다.

• Proceedings of the Korean Nutrition Society Conference
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• 2002.06a
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• pp.613-616
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• 2002

락토페린은 주로 유즙에 많이 포함되어 있으며 인간분비물 등에서도 발견되는 당단백질로써, 미생물 감염에 대한 방어작용이 있는 것으로 알려져 있다. 락토페린의 미생물에 대한 방어작용은 미생물 성장에 필요한 철이온이 락토페린에 결합하여 성장을 저해하기 때문인 것으로 알려져 있다. 락토페린은 이외에도 염증반응의 조절, 임파세포의 성장촉진 등 면역반응에도 관여하는데 이러한 활성은 철에 결합하는 성질과는 무관하게 일어나며 락토페린이 DNA에 결합하는 성질과 관련이 있는 것으로 추측되어진다. 락토페린은 DNA에 결합하여 유전자의 전사에 관여할 것으로 여겨지는데 그 동안 어떤 유전자의 발현에 관여하는지에 대해서 알려진 바가 없었다. 최근 본 연구팀은 락토페린이 포유세포의 세포유전자의 전사에 관여하는지를 분석한 결과 락토페린 결합부위를 가지고 있는 유전자중의 하나인 인간 인터루킨-1$eta$ 유전자의 전사를 활성화시킨다는 연구 결과를 보여 주었다. 인간 myelogenous leukaemia 세포주인 K562 세포를 락토페린과 phorbol myristate acetate(PMA)로 함께 처리하면 K562 세포의 인터루킨-1$\beta$ mRNA의 양은 PMA 단독으로 처리하였을 때 보다 상승적으로 더 많이 유도됨을 보여주었다. 또한 IL-1$\beta$/Luciferase 융합 유전자를 K562 배양세포에 넣어 전사 활성을 비교함으로써 락토페린에 의한 인터루킨-1$\beta$의 전사활성을 확인하였다. 락토페린을 전체, N-말단, 혹은 C- 말단 부위를 COS-1 세포에 발현시켜 전사 활성을 측정한 결과 C-말단 쪽은 전사활성이 없었으나 N-말단 90개 아미노산 부위(NIa라 명명)가 전사활성을 가지고 있음을 규명하였다. 본 연구결과는 락토페린이 인터루킨-I$\beta$의 유전자의 전사에 역할을 하고 있음을 보여 주고 있으며 또한 인터루킨-1$\beta$의 유전자 외에도 락토페린 결합 부위를 유전자의 조절부위에 포함하고 있는 세포 유전자의 전사도 관여할 수 있음을 제시하고 있다.

• Journal of the Korean Society of Food Science and Nutrition
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• v.42 no.10
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• pp.1690-1700
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• 2013

The objective of this study is to develop and validate predictive growth models for Bacillus cereus (diarrhea type) vegetative cells, spores and Staphylococcus aureus in preprocessed Namul (bracken and Chwinamul) and root vegetables (bellflower and burdock). For validation of model performance, growth data for S. aureus in preprocessed vegetables were collected at independent temperatures (18 and $30^{\circ}C$) not used in the model development. In addition, model performance of B. cereus (diarrhea type) in preprocessed vegetables was validated with an emetic type of B. cereus strain. In primary models, the specific growth rate (SGR) of the B. cereus spores was faster than that of the B. cereus vegetative cells, regardless of the kinds of vegetables at 24 and $35^{\circ}C$, while lag time (LT) of the B. cereus spores was longer than that of the B. cereus vegetative cells, except for burdock. The growth of B. cereus and S. aureus was not observed in bracken at temperatures lower than 13 and $8^{\circ}C$, respectively. The LT models for B. cereus (diarrhea type) in this study were suitable in predicting the growth of B. cereus (emetic type) on burdock and Chwinamul. On the other hand, SGR models for B. cereus (diarrhea type) were suitable for predicting the growth of B. cereus (emetic type) on all preprocessed vegetables. The developed models can be used to predict the risk of B. cereus and S. aureus in preprocessed Namul and root vegetables at the retail markets.