• KSBB Journal
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• 제18권6호
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• pp.479-484
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• 2003

염색폐수에 포함된 PVA를 생물학적으로 제거하고자 34 종의 PVA 분해용 균주를 염색폐수 및 슬러지로부터 분리하였다. 이 중 PVA 분해 시험을 거쳐 2 종의 균주를 최종분리하여 동정하여 Microbacterium barkeri LCa와 Paenibacillus amylolyticus LCb로 명명하였다. 최종분리균의 최적성장조건 및 최대분해조건을 규명해보았는데, 온도는 3$0^{\circ}C$, pH는 7, 탄소원은 starch, 그리고 질소원은 peptone으로 판명되었으며, 최적조건 하에서의 PVA 분해율은 89%를 보였다. 또한, 본 연구에서 분리한 균주는 PVA 중합도의 영향 없이 높은 분해율을 유지하는 것으로 판명되었다.

• 한국생물공학회:학술대회논문집
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• 한국생물공학회 2001년도 추계학술발표대회
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• pp.44-45
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• 2001

• 한국미생물생명공학회:학술대회논문집
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• 한국미생물생명공학회 2001년도 Proceedings of 2001 International Symposium
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• pp.114-115
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• 2001

• 한국미생물학회:학술대회논문집
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• 한국미생물학회 2008년도 International Meeting of the Microbiological Society of Korea
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• pp.164-164
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• 2008

• 한국지하수토양환경학회:학술대회논문집
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• 한국지하수토양환경학회 2005년도 총회 및 춘계학술발표회
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• pp.28-30
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• 2005

Because of high population diversity in soil microbial communities, it is difficult to accurately assess the capability of biodegradation of toxicant by microbes in soil and sediment. Identifying biodegradative microorganisms is an important step in designing and analyzing soil bioremediation. To remove non-important noise information, it is necessary to selectively enrich genomes of biodegradative microorganisms fromnon-biodegradative populations. For this purpose, a stable isotope probing (SIP) technique was applied in selectively harvesting the genomes of biphenyl-utilizing bacteria from soil microbial communities. Since many biphenyl-using microorganisms are responsible for aerobic PCB degradation In soil and sediments, biphenyl-utilizing bacteria were chosen as the target organisms. In soil microcosms, 13C-biphenyl was added as a selective carbon source for biphenyl users, According to $13C-CO_2$ analysis by GC-MS, 13C-biphenyl mineralization was detected after a 7-day of incubation. The heavy portion of DNA(13C-DNA) was separated from the light portion of DNA (12C-DNA) using equilibrium density gradient ultracentrifuge. Bacterial community structure in the 13C-DNAsample was analyzed by t-RFLP (terminal restriction fragment length polymorphism) method. The t-RFLP result demonstates that the use of SIP efficiently and selectively enriched the genomes of biphenyl degrading bacteria from non-degradative microbes. Furthermore, the bacterial diversity of biphenyl degrading populations was small enough for environmental genomes tools (metagenomics and DNA microarrays) to be used to detect functional (biphenyl degradation) genes from soil microbial communities, which may provide a significant progress in assessing microbial capability of PCB bioremediation in soil and groundwater.

• 한국수소및신에너지학회논문집
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• 제30권3호
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• pp.269-275
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• 2019

This study was conducted to evaluate the microbial communities in coupled system of a microbial electrolysis cell and an anaerobic digestion. Glucose, butyric acid, propionic acid and acetic acid were used as substrates. The maximum methane production and methane production rate of propionic acid respectively were $327.9{\pm}6.7mL\;CH_4/g\;COD$ and $28.3{\pm}3.1mL\;CH_4/g\;COD{\cdot}d$, which were higher than others. Microbial communities' analyses indicated that acetoclastic methangens were predominant in all systems. But the proportion of hydrogenotrophic methanogens was higher in the system using propionic acid as a substrate when compared to others. In coupled system of a microbial electrolysis cell and anaerobic digestion, the methane production was higher as the distribution of hydrogen, which was generated by substrate degradation, and proportion of hydrogenotrophic methanogens was higher.

• Asian-Australasian Journal of Animal Sciences
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• 제14권6호
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• pp.797-802
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• 2001

Two strains of rumen fungi (Piromyces rhizinflata B157, Orpinomyces joyonii SG4) and three strains of rumen cellulolytic bacteria (Ruminococcus albus B199, Ruminococcus flavefaciens FD1 and Fibrobacter succinogenes S85) were used as mono-cultures or combinationally arranged as co- and sequential-cultures to assess the relative contributions and interactions between rumen fungi and cellulolytic bacteria on rice straw degradation. The rates of dry matter degradation of co-cultures were similar to those of corresponding bacterial mono-cultures. Compared to corresponding sequential-cultures, the degradation of rice straw was reduced in all co-cultures (P<0.01). Regardless of the microbial species, the cellulolytic bacteria seemed to inhibit the degradation of rice straw by rumen fungi. The high efficiency of fungal cellulolysis seems to affect bacterial degradation rates.

• 한국잡초학회지
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• 제17권2호
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• pp.214-219
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• 1997

토양중에 있어서 제초제(除草劑) alachlor 분해(分解)에 미치는 퇴비(堆肥), 화학(化學) 비료(肥料), 중금속(重金屬), 합성(合成) 세제(洗劑)의 영향(影響)에 대하여 연구한 결과를 요약하면 다음과 같다. 토양(土壤)중 alachlor는 1차 반응식(反應式)에 따라 분해(分解)되었으며 반감기(半減期)는 6.4일이었다. 퇴비(堆肥) 첨가(添加)는 alachlor의 분해(分解)를 촉진(促進)시켰다. 화학(化學) 비료(肥料)중 질소와 칼리 특히 질소 첨가에 의하여 alachlor의 분해(分解)가 촉진(促進)되었다. 토양중 alachlor의 분해(分解)는 중금속(重金屬)에 의하여 억제(抑制)되었으며 Cd, Cr, Ni, Zn, Cu 첨가(添加) 토양(土壤)중 반감기(半減期)는 각각 11.0, 8.3, 7.9, 7.2, 6.7일이었다. 합성(合成) 세제(洗劑) 첨가(添加) 또한 alachlor의 분해(分解)를 억제(抑制)시켰으며 반감기는 7.5일이었다. 각종(各種) 물질(物質)을 첨가(添加)한 토양(土壤)중에서 alachlor의 분해율(分解率)은 토양(土壤)의 microbial biomass나 호흡율(呼吸率)과 높은 정(正)의 상관(相關) 관계(關係)를 보여 각종(各種) 첨가(添加) 물질(物質)이 alachlor의 분해(分解)를 촉진(促進)혹은 억제(抑制)하는 것은 이들 첨가(添加) 물질(物質)이 분해(分解) 미생물(微生物)의 생육(生育)을 촉진(促進)또는 억제(抑制)하였기 때문으로 판단되었다.

• Journal of Microbiology and Biotechnology
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• 제26권12호
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• pp.2127-2137
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• 2016

A mangrove microbial community was analyzed at the gene and protein levels using metagenomic and proteomic methods with the green macroalgae Enteromorpha prolifera as the substrate. Total DNA was sequenced on the Illumina HiSeq 2000 PE-100 platform. Two-dimensional gel electrophoresis in combination with liquid chromatography tandem mass spectrometry was used for proteomic analysis. The metagenomic data revealed that the orders Pseudomonadales, Rhizobiales, and Sphingomonadales were the most prevalent in the mangrove microbial community. By monitoring changes at the functional level, proteomic analyses detected ATP synthase and transporter proteins, which were expressed mainly by members of the phyla Proteobacteria and Bacteroidetes. Members of the phylum Proteobacteria expressed a high number of sugar transporters and demonstrated specialized and efficient digestion of various glycans. A few glycoside hydrolases were detected in members of the phylum Firmicutes, which appeared to be the main cellulose-degrading bacteria. This is the first report of multiple "omics" analysis of E. prolifera degradation. These results support the fact that key enzymes of glycoside hydrolase family were expressed in large quantities, indicating the high metabolic activity of the community.

• Korean Chemical Engineering Research
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• 제52권2호
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• pp.175-181
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• 2014

고분자전해질 연료전지용 MEA(Membrane and Electrode Assembly)와 가축분뇨를 이용해 미생물연료전지(MFC)를 구동하였다. 여러 균을 혼합해 MFC를 구동했을 때 개별적으로 구동했을 때보다 높은 개회로전위(OCV)를 나타냈다. 돼지분뇨, 소분뇨, 닭분뇨, 오리 분뇨 중 돼지 분뇨를 이용했을 때 제일 높은 OCV 540mV를 보였다. 그리고 돼지분뇨에서 최고 $963mW/m^2$의 전력이 발생하였다. MFC 구동과정에서 MEA의 $Na^{2+}$, $Ca^{2+}$, $K^+$ 이온 및 불순물들에 의한 오염이 MFC의 낮은 성능의 한 원인임을 확인하였다.