• Journal of Applied Biological Chemistry
• /
• 제54권1호
• /
• pp.51-55
• /
• 2011

마(Dioscorea batatas)의 건강보조제로의 개발을 위해, 3가지 유산균, Lactobacillus acidophilus, Lactobacillus plantarum 그리고 Bifidobacterium longum 균주를 이용하여 발효를 하였다. 발효물은 10% 발효물 수용액으로 pH 측정결과 3.83, 총 유산균수는 $8{\times}10^6$ CFU/mL로 표준화 하였다. TNBS-로 유도된 대장염 마우스 모델에 일반 마(400 mg/kg)와 발효된 마(200, 400mg/kg)를 섭취한 결과, 조직학 및 형태학적 손상정도 그리고 MPO 활성 등이 비발효 마처리군에 비하여 발효된 마를 처리한 군에서 현저하게 감소되는 것을 확인하였다. 농도별로는 발효된 마가 200 mg/kg으로 처리된 군보다 400 mg/kg으로 처리된 마에서 설변이나 조직의 붕괴 현상을 현저하게 억제시키는 것을 알 수 있었다. 유산균 발효 마를 투여한 대장염 마우스에서는 체중감소 및 염증세포의 침윤을 효과적으로 억제하였다. 이러한 결과를 통하여, 유산균 발효물이 대장염 모델에서 매우 효과적으로 항염효과를 보였으며, 대장염 치료 및 예방에 매우 유용한 자료로 활용될 것으로 사료된다.

• Journal of Microbiology
• /
• 제41권1호
• /
• pp.28-33
• /
• 2003

Pycnogenol (PYC) is believed to have potential as a therapeutic agent against free radical-mediated oxidative stress. It is important, therefore, to understand the interactions between PYC and cellular defenses against oxidative stress. Toward this end, we analyzed the survival rates on the gene expression responses of E. coli sod katG mutants to PYC after pre-treatment of PQ or H$_2$O$_2$-mediated stress under aerobic conditions. We identified SOD induced by PYC, but not HP1 in sod hate mutants. A striking result was the PYC induction of SOD with antioxidant property in single katG mutant cells, particularly MnSOD and CuZnSOD. These inductions were further increased with oxidative stress, while HP1 was not induced in these conditions. The effects of pycnogenol treatment on these cells depend in part on its concentration on the stress response. Protective effects of PYC exposure which affected gene expression in cells were consistent with cell survival rates. Our results demonstrate that pycnogenol may alter the stress response gene expression in a specific manner such as SOXRS because PYC induction of single mutant only worked under increased PQ stress. All together our data indicate that SOD activity is essential for the cellular defense against PQ-mediated oxidative stress, suggesting that PYC may not be effective as an antioxidant in only oxidative stress conditions. On the other hand, it was expected that PYC may play a role as a pro-oxidant and if it is available for use, it should be evaluated carefully.

• 유기물자원화
• /
• 제18권4호
• /
• pp.64-68
• /
• 2010

최근, 국내에서 MBT(Mechanical Biological Treatment) 처리시설이 건설되어 운영 중에 있으며, 생활폐기물 등이 분리선별되어 재활용되고 있다. 그러나, 생활폐기물의 입도가 불균질하고, 분리선별을 하기 위해서 일정입도 이하로 파쇄하여야 하므로 운영상의 문제점이 발생하게 된다. 또한, 생활폐기물내 유기성분의 분리선별이 어려워서, 재활용 물질의 이용이 어려운 실정이라 이에 대한 대책이 요구된다. 본 연구에서는 1ton/batch 규모의 반응기에 과열증기를 사용하여 각 반응인자에 따른 생활폐기물 분리선별 효율을 파악하였으며, 유기성분 분해에 따른 생활폐기물 입도특성의 변화를 고찰하였다.

• 한국산학기술학회논문지
• /
• 제17권3호
• /
• pp.86-92
• /
• 2016

본 연구는 가황촉진제 제조공정에서 발생되는 MBT 폐수의 생물학적 처리가능성을 평가하였다. MBT 폐수는 미생물 활동을 저하시키기 때문에 생물학적으로 처리가 불가능하였지만, 7일의 순응기간을 거쳐 약 10%의 COD가 제거되었다. MBT 폐수의 화학적 전처리를 위한 최적조건은 pH 3.5, 2시간동안 교반 후 $Fe^{3+}$를 주입하여 펜톤산화를 한 경우였다. 또한, 펜톤처리 된 MBT 폐수를 제지폐수와 혼합하여 활성슬러지공정에서 처리했을 경우 MBT 폐수의 COD가 약 20% 제거되었다.

• 대한의용생체공학회:학술대회논문집
• /
• 대한의용생체공학회 1997년도 춘계학술대회
• /
• pp.43-46
• /
• 1997

The interfacial bond strength and microstructural analysis of pre-heat treated porcelain-fused-metal (PFM) were investigated using a mechanical three-point bending tester and scanning electron microscope(SEM). Four kinds of heat treated samples were prepared as follows; A: heating $1200^{\circ}F\rightarrow1600^{\circ}F$, holding 1min, reheating $\rightarrow1850^{\circ}F$, hold 3min under vacuum, B: heating $1200^{\circ}F\rightarrow1600^{\circ}F$ holding 1min, reheating $\rightarrow1850^{\circ}F$ under vacuum condition, C: heating $1200^{\circ}F\rightarrow1600^{\circ}F$, holding 1min, reheating $\rightarrow1850^{\circ}F$, holding 3min in the air, repeat same heat treatment process under vacuum condition, D: heating $1200^{\circ}F\rightarrow1600^{\circ}F$, holding 1min, reheating $\rightarrow1850^{\circ}F$, holding 1min in the air. The three-point bending test results shows that the interfacial bond strength of specimen B and C were higher than that of A and B. The SEM study reveals that Specimen C shows the highest surface density.

• 환경위생공학
• /
• 제18권1호
• /
• pp.23-29
• /
• 2003

The effect of ozone oxidation on bio-degradability of leachate was studied. Ozone oxidation process was used as pre-treatment process to enhance performance of biological process in treating landfill leachate. Optimum ozone injection rate and contact time in this experiment was $160{\;}mg{\;}O_/{\ell}{\cdot}hr$ and 45 minutes, respectively. Bio-degradability was enhanced 5.08% by ozone oxidation. The ratio of ozone demand/DOC concentration was $0.049~0.091{\;}mg{\;}O_3/mg{\;}DOC$. The increase of bio-degradability depending on ozone injection rate(D) and contact time(T) can be expressed as follows ; The rate of bio-degradation of DOC was increased proportionally with the increase of ozone injection rate and contact time irrespective of landfill site age. The increase of bio-degradability by ozone addition was not satisfactory. It is hard to expect significant increase in bio-degradability by ozone treatment only. Thus, it is evaluated that ozone oxidation can not increase biodegradability significantly in concentrated wastewater composed of complex organic compound such as leachate.

• The Plant Pathology Journal
• /
• 제21권1호
• /
• pp.59-63
• /
• 2005

Bacillus subtilis S1-0210 was selected as a biological agent against Botrytis cinerea in strawberry. The isolate inhibited mycelial growth of B. cinerea in vitro tests. A wettable powder formulation of B. subtilis S1-0210 significantly reduced infection rates with lower than 5%, compared with higher than 70% of infection rates in untreated control. The formulation showed 85 to 89% control efficacies of gray mold incidences on fruits of strawberry in pots. Pre-treatment of the agent was more effective in controlling gray mold on fruits and leaves than post-treatment at the early stage of disease development. The formulation also showed 70% control efficacy of gray mold incidence on fruits of strawberry in a field trial. The results indicate that B. subtilis S1-0210 in the wettable powder formulation may be a potential biocontrol agent to control gray mold on strawberry.

• 한국물환경학회지
• /
• 제21권1호
• /
• pp.1-6
• /
• 2005

The effect of ozone oxidation on biodegradability of leachate was studied. Ozone oxidation process was used as pre-treatment process to enhance performance of biological process in treating landfill leachate. Optimum ozone dosing rate and contact time in this experiment was $160mg\;O_3/L$ hr and 45 minutes, respectively. Biodegradability was enhanced 5.08% by ozone oxidation. The ratio of ozone demand/DOC concentration was $0.049{\sim}0.091mg\;O_3/mg$ DOC. The increase of biodegradability depending on ozone dosing rate(D) and contact time(T) can be expressed as follows ; ${\Delta}E=0.00479{\cdot}D^{0.773}{\cdot}T^{0.800}$ The biodegradation rate of DOC was increased proportionally with the increase of ozone dosing rate and contact time irrespective of landfill site age. The increase of biodegradability by ozone addition was not satisfactory. It is hard to expect significant increase in biodegradability by ozone treatment only. Thus, it is evaluated that ozone oxidation can not increase biodegradability significantly in concentrated wastewater composed of complex organic compound such as leachate.

• The Korean Journal of Physiology and Pharmacology
• /
• 제15권2호
• /
• pp.89-94
• /
• 2011

Fucoidan is a sulfated polysaccharide derived from brown algae that has been reported to perform multiple biological activities, including immunostimulation. In this study, we investigated whether fucoidan has beneficial effects on endotoxemia induced by LPS, a septic model in mice. The focus of this study was on survival rates and spleen function of the mice upon treatment. We found that fucoidan had prophylactic effects on the survival rate of mice with endotoxemia. Flow cytometric analysis using antibodies for subset-specific markers revealed that fucoidan profoundly reversed the depleted population of dendritic cells in mice with endotoxemia. According to Western blot analysis, the spleen cells of LPS/fucoidan-treated mice showed a higher expression of anti-apoptotic molecules compared to those of LPS-treated mice. Also, fucoidan-treated spleen cells were more responsive to mitogens. Taken together, these results demonstrate that fucoidan pre-treatment has beneficial effects on the survival rate and function of the spleen in mice with endotoxemia. This study may broaden the use of fucoidan in clinical fields, especially endotoxemia.

• 식품보건융합연구
• /
• 제4권4호
• /
• pp.18-25
• /
• 2018

Proteins play a key role in many functions such as metabolic activity, differentiation, as cargos and cell fate regulators. It is necessary to know about the markers involved in male fertility in order to develop remedies for the treatment of male infertility. But, the role of the proteins is not limited to particular function in the biological systems. Some of the proteins act as ion channels such as catsper and proteins like Nanos acts as a translational repressor in germ cells and expressed in prenatal period whose role in male fertility is uncertain. Rbm5 is a pre mRNA splicing factor necessary for sperm differentiation whose loss of function results deficit in sperm production. DEFB114 is a beta defensin family protein necessary for sperm motility in LPS challenged mice where as TEX 101 is a plasma membrane specific germ cell protein whose function is not clearly known u to now. Gpr56 is another adhesion protein whose null mutation leads to arrest of production of pups in rats. Amyloid precursor protein role in Alzheimer's disease is already known but it plays an important role in male fertility also but its function is uncertain and has to be considered while targeting APP during the treatment of Alzheimer's disease. The study on amyloid precursor protein in male fertility is a novel thing but requires further study in correlation to alzheimer's disease.