• Proceedings of the Korean Society of Soil and Groundwater Environment Conference
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• 2001.02a
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• pp.74-93
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• 2001

유류로 오염된 토양에 있어서의 미생물의 분포 및 활성도에 관한 연구는 오염토양의 생물학적 복원기술을 적용시키고자 하는 지역에서는 매우 중요한 연구이다. 따라서 본 연구에서는 유류 오염된 지역에서의 미생물 활성도를 ETS(Electron Transport System) 및 그 이외의 몇 가지 방법을 통하여 고찰해 보았다. 본 연구결과에 따르면 순화된 토양에서는 이미 유류를 산화시킬 수 있는 Burkholderia spp.가 이미 우점을 이루고 있었고, 생물학적 복원기술 중 Biostimulation법을 적용할 경우 이미 존재하는 미생물(Indigeonous microorganism)에 의한 유류오염물질의 산화를 가속화시킬 수 있는 것으로 나타났다.

• Korean Journal of Soil Science and Fertilizer
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• v.16 no.2
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• pp.195-202
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• 1983

Sixty paddy soil samples were collected from the different Korean agricultural climatic area to find relationship between soil physicochemical properties and soil microorganisms. The results are summarized as follows : 1. The mean numbers of microorganisms in collected paddy soils were $121.8{\times}10^5$ in bacteria (B), $22.5{\times}10^5$ in actinomycetes (A) and $32.4{\times}10^3$ in fungi (F) per gr soil. The ratios of B/F, B/A, and A/F were 385, 5.1 and 82, respectively. 2. Number of soil microorganism was lowest in Mountainous area, lower in Eastern Coast, Gyeonggi Bay and Chungcheong Continental area, but higher in Honam Plain and Southern Part. 3. The significant positive correlation were obtained between the number of microorganisms and soil chemical properties, available phosphorous, $K^+$, $Mg^{++}$, T-C and soil pH. 4. The number of soil microorganism was in the order of Clay loamy soil > Clayey soil > Loamy soil > Sandy loamy soil.

• Korean Journal of Soil Science and Fertilizer
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• v.34 no.5
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• pp.365-372
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• 2001

The objective of this study was to determine the effects of various kinds of composts on the change of soil physical properties and microorganism in upland soils. Field experiments were conducted in the loam and sandy loam soils, while the clay loam and sandy loam soils were used for laboratory experiments. Various kinds of composts such as poultry manure compost(PMC). cow manure compost(CMC). human excrement sludge(HES), and food industrial sludge compost(FISE) were applied annually at rates of 0, 40, and $80Mg\;ha^{-1}$ to soils grown with soybean and maize plants for 4 years during 1994 to 1997. The results of this study were as follows : Bulk density of loam soil decreased with compost application to $1.07{\sim}1.32Mg\;m^{-3}$ compared with $1.49Mg\;m^{-3}$ of control plot, while in sandy loam soil it decreased to $1.00{\sim}1.20Mg\;m^{-3}$ compared with $1.25Mg\;m^{-3}$ of control plot. Bulk density of soil was decreased according to maize cultivation compared with bare control, but soybean cultivation was similar. Population of organic material decomposing microorganisms was increased rapidly at the initial incubation stage at $25^{\circ}C$, and increased more sensitively at the loam soil than sandy loam soil. In the case of the change of microorganisms associated with nitrogen circulation, ammonia oxidizing bacteria was more at the initial incubation stage, and denitrifying bacteria was more at the initial incubation stage, and denitrifying bacteria increased until 1~4 weeks after incubation and increased more at the loam soil than sandy loam soil.

• Proceedings of the Korean Society of Food and Cookery Science Conference
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• 2003.10a
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• pp.74-74
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• 2003

We investigated the microbial populations and viable cell counts of Codonopsis lanceolata from uncultivated and cultivated soil in the suing. The microbial populations and viable cell counts from both types of soils were also investigated simultaneously. It had existed 10 more kinds of microorganisms in uncultivated than those in cultivated. The total viable cell counts of C. laneolata from uncultivated soil, especially in the upper zone, were 9.7$\times$10$^{6}$ CFU/g. However, the C. lanceolata from cultivated soil was 4.2$\times$10$^{6}$ CFU/g. (omitted)

• Proceedings of the Korean Society of Soil and Groundwater Environment Conference
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• 2000.05a
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• pp.20-23
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• 2000

The use of electrokinetic injection and transport for the distribution of an NAPLs-degrading microorganism in a sandy soil bed was studied. After the injection of the cell into cathode side of bed, an electric current was applied. The transport of cell though the sandy soil was achieved by electokinetics, mainly by electrophoresis, The pH control in electrode chamber plays un important role to achieve desirable cell transport because H$^{+}$ generated at anode is toxic or inhibits the transport of cells. Electokinetic distribution rate of bacterial cells changed depending on the applied electric current and pH. The degradation of diesel by electrokinetically transport cells were monitored.d.

• Proceedings of the Korean Environmental Health Society Conference
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• 2001.11a
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• pp.11-16
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• 2001

If microorganisms are injected into porous medium such as soils along with appropriate substrate and nutrients, soil pore size and shape are changed from the initial condition as a result of biofilm formation, which make hydraulic conductivity reduced. In this research, hydraulic conductivity reduction was measured after specific bacterium or fungus was inoculated into soil pore. Hydraulic conductivity was decreased to 10 % ∼ 1 % and maintained constant while substrate was provided. Under the adverse conditions such as no substrate, chemical solution permeation, and freeze-thaw cycles, hydraulic conductivity was increased 30∼50%. Hydraulic conductivity decrease of fungus-soil mixture was faster than that of bacterium-soil mixture. Fungus-soil mixture, however, was more sensitive to the adverse conditions.

• Mycobiology
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• v.49 no.4
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• pp.346-354
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• 2021

The genus Aspergillus is commonly isolated from various marine and terrestrial environments; however, only a few species have been studied in rhizosphere soil. As part of the Korean indigenous fungal excavation project, we investigated fungal diversity from rhizosphere soil, focusing on Aspergillus species. A total of 13 strains were isolated from the rhizosphere soil of three different plants. Based on phylogenetic analysis of β-tubulin and calmodulin and morphological characteristics, we identified five Aspergillus species. A. calidoustus and A. pseudodeflectus were commonly isolated from the rhizosphere soil. Four species were confirmed as unrecorded species in Korea: A. calidoustus, A. dimorphicus, A. germanicus, and A. pseudodeflecuts. The detailed morphological descriptions of these unrecorded species are provided.

• Proceedings of the Zoological Society Korea Conference
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• 1998.10b
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• pp.278.1-278
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• 1998

No Abstract, See Full Text

• Journal of Korean Society of Environmental Engineers
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• v.36 no.4
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• pp.277-285
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• 2014

The usage of efficient microorganism (EM) is increasing in concern for server purposes including odor removal during carcasses degradation. In this study, we have studied the type of soil and its effect on efficient microorganisms for the removal of odorous gases during buried carcasses degradation in lab-scale reactor. The carcasses are buried in the reactor with various soil types such as normal soil, 20% sandy and 20% clay soil with the efficient microorganism KEM. The efficient microorganisms KEM have the ability to stabilize the degradation of carcasses of the burial site. We have focused on the analysis of odorous gases such tri-methylamine (TMA), hydrogen sulfide ($H_2S$), methyl mercaptan (MM), dimethyl sulfide (DMS), dimethyl disulfide (DMDS), carbon dioxide ($CO_2$), and methane ($CH_4$) along with the changes of microbial community changed during complete degradation of buried carcasses for a year. The results suggested that the 20% sandy soil contain lesser level of $H_2S$ and MM (0.09 and 0.35 mg) but 20% clay has higher nitrogen compound removing effect and leave only less amount of ammonia and TMA (0.31 and 2.06 mg). The 20% sandy soil also has the ability to breakdown the carcasses more quality compared with other types of soil. Based on the data obtained in this study suggesting that, the use of 20% sandy soil can effectively control sulfur compounds whereas 20% clay soil controls nitrogen compounds in the buried soil. Depending on the type of the soil, the dominant of microbial communities and the distribution was change.

• Korean Journal of Medicinal Crop Science
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• v.22 no.2
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• pp.127-133
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• 2014

This experiment was carried out to investigate the effect of several organic compost on the growth and root yield of Angelica gigas Nakai with organic cultivation. After fertilizing the soil with organic fertilizer, the dry weight of liming fertilizer showed a slow change, while microorganism fertilizer decreased about 29% until 20 day after fertilizing. At 110 days after fertilizing, microorganism fertilizer decreased more than liming fertilizer. Liming fertilizer decomposed slowly, while microorganism fertilizer decomposed early on rapidly but gently after 20 days in decomposed rate of organic fertilizer. Dried root yields per 10a of A. gigas were not significance between 277.6kg in conventional fertilizer and 277.7kg, 280.5kg in N 1.5, N 2.0 times of microorganism fertilizer. Decursin and decursinol angelate contents in A. gigas were 9.08 ~ 9.07% from N 1.0 and N 1.5 times in liming fertilizer, and 7.94 ~ 8.12% from N 1.5 times and N 2.0 times in microorganism fertilizer, compared to 7.31% of conventional treatment.