• Korean Journal of Organic Agriculture
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• v.18 no.1
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• pp.83-92
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• 2010

Organic farming is a type of agricultural practices based on naturally occurring processes excluding or strictly limiting the use of synthetic fertilizers, pesticides, and other chemicals. This study was conducted to investigate the influences of agro-based materials, effective microorganisms (EM), liquid silicate (LS), and organic liquid fertilizer (OLF) for water dropwort (Oenanthe stolonifera DC.) cultivation. Soil pH, soil organic matter, and plant available phosphorous decreased with LS application. Exchangeable Ca and Mg decreased with EM application, and electrical conductivity and exchangeable Ca and K decreased with OLF application. Most of essential nutrient contents in water dropwort were reduced with the treatments of LS, EM, and OLF as compared with those in control plot, except nitrogen and phosphorus. However, diseases and insect pests were almost not observed in the water dropwort in the agro-based material application plots, except cluster caterpillar (Spodoptera litura). Productivity of water dropwort tended to be reduced: its higher productivity in the OLF and EM+LS plots and lower in the LS and control plots.

• Korean Journal of Food Science and Technology
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• v.29 no.1
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• pp.107-114
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• 1997

Various fractions of apple fibers such as crude pulp, total dietary fiber, soluble dietary fiber, and insoluble dietary fiber were prepared and added to the proteose peptone-yeast extract-fildes (PYF) media to see their effects on the growth of type cultures of intestinal bacteria. Most microbes tested in this experiment grew well in PYF media with the soluble dietary fiber of apple than with the insoluble dietary fiber. Especially Bifidobacterium species such as B. adolescentis, B. animalis, B. infantis, B. longum, B. thermophilum showed higher growth in PYF media containing the soluble dietary fiber than other fiber fractions. However, pectin-added media didn't promote the growth of most microbes used in the experiment. In the in vitro mixed culture using rat feces as starter, the addition of the soluble dietary fiber or pectin to the basal medium showed larger proportion of Bifidobacterium species in total bacteria than that of glucose.

• Journal of Korea Soil Environment Society
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• v.4 no.2
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• pp.193-201
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• 1999

This study was conducted to check the applicability of pilot-scale co-composting for the remediation of diesel contaminated soil during the winter. Nutrients and microbes were added to enhance the efficiency of bioremediation and fermenting composts were also added to stimulate the microbial activities. As a result. the soil pile was kept at adequate temperature for the bioremediation during the test period of 30∼40 days and initial concentration(2,340mg TPH/kg dry soil) was reduced to 216mg TPH/kg dry soil (approximately 91% removal). During the initial 10∼30 days, it was found that the TPH concentration and the microbial population were rapidly reduced and increased. respectively. The co-composting technology studied can be effectively applied to remediate the diesel contaminated soil during the winter.

• KSBB Journal
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• v.4 no.2
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• pp.110-117
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• 1989

The fiffusion characteristics of substrate of varing biomass concentrations into and from Ca- alginate gel beads in well-stirred solutions were investigated. Ca-alginate gel beads were immobilized by Zymomonas mobilis or free from cells. The values of the diffusion coefficient of substrate were calculated by means of the method of Least squares and Random pore model. Reaction rates are expressed by the Michaelis-Menten type equation, and the results are compared with experimental data. Intraparticle effective diffusivity of substrate resistance on reaction by using immobilized Z.mobilis entrapped by Ca-alginated gel seemed to be restricted by cell density. The experimental data also indicated relationship between the effective diffusivity and the cell concentration used in the gel preparation.

• Korean Journal of Fisheries and Aquatic Sciences
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• v.21 no.1
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• pp.50-56
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• 1988

In order to fine some proper bacterial food for Tigriopus japoncus, bacterial flora of the tide pool inhabited by the copepod has been isolated and tested as bacterial food. Food effect and optimum density of the bacteria in terms of survival rate of the copepod was measured in the larval and the adult stages. Among the 264 strains of isolated bacteria, Acinetobacter spp. Moraxella, spp., Flavobacterium spp. and Pseudomonas spp. were certified as effective food for the copepod. According to the experimental results, Acinetobacter spp. AG-3 was the most effective food for all the stages from nauplius to adult, while Moraxella spp. and Flavobacterium spp. were effective for copepodite stage, and Pseudomonas spp. for the adult stage only. The optimum density of bacteria for the food was about $10^6\;cell/ml$, which was the same average density of bacteria in the tide pool.

• Journal of the Korean Society of Food Science and Nutrition
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• v.29 no.6
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• pp.1123-1126
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• 2000

수증기 증류법으로부터 얻은 배초향(Agastache rugo-sa, Labiatae)의 정유는 부패균을 포함하는 수종의 미생물에 대하여 현저한 항균활성을 나타내었다. 배초향의 유효성분을 확인하기 위하여 정유성분을 GC-MS로 분석한 결과 GC chromatogram에서 얻은 각 피크의 reten-tion time 및 mass spectral data 의표준물질과의 비교에 의해서 isomenthone, methone, dihydrocarvone, anetho-le, vanillin, eugenol, methyleugenol, $\beta$-caryophyllene, $\beta$-caryophyllene oxide 등의 정유성분이 확인되었다. 이 연구에서 밝혀진 여러 성분들의 항균 활성은 잘 알려져 있으므로 이들이 유효성분으로 추측된다. 또한 Korean mint로 세계적으로 알려져 있는 배초향의 정유는 식품 방부제로서 적합할 것으로 생각된다.

• Korean Journal of Soil Science and Fertilizer
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• v.29 no.2
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• pp.181-189
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• 1996

Several phosphate-solubilizing microorganisms were isolated in order to enhance the availability of insoluble phosphates accumulated in soils. Among the microorganisms, Aspergillus niger was selected and identified for this study. The phosphate-solubilizing activity. the phosphorus uptake by plants and the changes in soil microbial biomass by inoculation of Aspergillus niger were investigated. The uptake amounts of phosphorus by lettuce and pimiento were increased by inoculation of Aspergillus niger in all experimental treatments. There was negative correlation between the soil microbial biomass P and the soil phosphorus content. However the soil available phosphorus ($Y=-0.0007X^2+0.7126X^2-29.46$, $R=0.8283^{**}$) and the phosphorus absorption of plants ($Y=0.0049X^2-2.2352X+326.34$, $R=0.6350^*$) were significantly correlated to soil microbial biomass C on the positive section of quadric curve.

• Korean Journal of Microbiology
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• v.25 no.2
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• pp.110-116
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• 1987

As a pary of investgation on effective accumulation of cadmium in yeast cells, effect of surfactant was studied on intracellular accumulation of cadmium in extremely cadmium-tolerant yeast, Hansenula anomala B-7. Cadmium accumulation was enhanced up to approximately 40% by the addition of non-ionic surfactant, Triton X-100 and its optimal concentration was found to be 0.1-0.2%. Furthermore, optimum conditions for intracellular accumulation of cadmium were at $40^{\circ}C$ and initial pH 6.0 for 48 hours under shaking culture.

• Korean Journal of Microbiology
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• v.5 no.1
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• pp.34-38
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• 1967

Theoretical analysis reported in this paper is on the varities of the growth rate of Chlorella ellipsoidea due to the amount of available phosphorus for the purpose of the continual mass culture. Available phosphorus in the culture media of the Chlorella was also estimated at a limiting factor as this experiment. The equation between the concentration of Chlorella n and growth period t is $\frac{dn}{dt}=Kn$, and the functional relation between the Specific growth rate K and steady state period T is the following: $K=\frac{2.303}{T}$log\frac{n}{no}$ ($n_o$=initial concentration).

• Proceedings of the Membrane Society of Korea Conference
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• 1991.10a
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• pp.49-50
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• 1991

최근 산업폐수의 수질오염에 대한 국민적 관심이 높아지면서 정부의 배출수 수질기준강화 및 배출부과금의 인상 등으로 기업의 폐수처리에 관한 인식이 상당히 달라졌다. 기존의 폐수처리는 각공정에서 발생되는 폐수는 종합적으로 수집하여 처리하는 소위 END OF PIPE 처리방법이 대부분이며 산화/환원, 응집/침전, 미생물분해, 여과 등이 주로 사용되고 있다. 그러나 END OF PIPE 처리방식에서는 소량이지만 처리가 어렵거나 독성이 강한 물질이 일부분의 공정에서 발생되어도 분리처리되지 않고 전체적으로 합쳐지므로 처리시설이 복잡하고 규모도 커진다. 따라서 최근의 폐수처리는 각 생산공정에서 발생되는 폐수를 소규모의 처리시설로 처리하기 어려운 소량의 오염물질을 제거하거나 유효성분일 경우 회수하여 재활용하는 방향으로 연구가 진행되고 있다.