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오리나무 열매를 이용한 생물처리장치에서의 톨루엔 가스 처리효율 특성
공남식,차수길,서정윤 한국대기환경학회 2003 한국대기환경학회지 Vol.19 No.6
This study was to examine characteristics of treating toluene vapor, which gets to be problematic due to its harmful carcinogenicity and mass generation from various sources, through a biological treatment facility which is environment-friendly and adopts a high-efficient and low-cost clean technology. In order to identify whether Alnus Firma Fruit (AFF) can be used as a media for a bioreactor, its utility and basic operating factors, a study was conducted on pressure drop, supply of nutrient substances and retention time which are operating factors of a biofilter, and eliminating characteristics were compared between AFF and the conventional biological activated carbon (BAC) widely used as filter media. In the case of AFF, the initial microbial deposits was 2.3 X 10^(7) CFU/g dry AFF, which represents the initial microbial density higher than the case of BAC showing 5.5 x 10^(6) CFU/g dry BAC. And it took about 2 weeks to acclimate until its eliminating rate got to be increased over 90%. As a result of comparing pressure loss taking place with the lapse of time between BAC and AFF, after 130 days passed at SV 25 h^(-1), BAC showed that its eliminating efficiency had a tendency to drop greatly due to a great pressure loss (0.53-> 54.7 ㎜H₂O/m) caused by an excess of biomass as accumulated. On the other hand, AFF showed that the pressure drop was 0.53 ㎜H₂O/m, about 2 times as much as the initial pressure loss of 0.4 ㎜H₂O/m, which represents no great change in the pressure loss, and its eliminating efficiency was also shown to be continuously high. Therefore, when AFF was used as a filler for a biological treatment facility, a biological filter enabling improvement of the purifying efficiency to be promoted could be provided, and moreover, the pressure loss was so small that the filler replacement cycle or the back flushing cycle could be extended. So, even in terms of the operating cost, it was identified to be an economical filler. When an inorganic material was used as a filler, the biofilters performance acted sensitively on whether nutrient substances were supplied or not. In the case of AFF with low adsorptivity, addition of ethyl-alcohol increased the solubility of toluene, and consequently, biodegradation got to be actively made by microbes, and thus, its eliminating rate could be increased. As the flow velocity and the inflow concentration got to be more increased, its eliminating rate got to be lower, and particularly, an increase in the flow velocity made its eliminating rate drop more greatly than an increase in the concentration.
Isolation and Characterization of BTEX Tolerant and Degrading Pseudomonas putida BCNU 106
최혜정,Jeoung-Yoon Seo,Su Mi Hwang,이용일,정영기,문자영,주우홍 한국생물공학회 2013 Biotechnology and Bioprocess Engineering Vol.18 No.5
Bacterial strains growing in river sediments were screened to identify an organic solvent-tolerant strain of Pseudomonas. Using this screen, Pseudomonas sp. BCNU 106 was isolated on the basis of its ability to grow on benzene, toluene, ethylbenzene, and three xylene isomers,o-, m- and p-xylene, as its sole carbon source. BCNU 106was identified as a gram-negative, rod-shaped aerobic and mesophilic bacterium, which grew in liquid media containing high concentrations of organic solvents. 16S rDNA analysis classified BCNU 106 as a new member of the genus Pseudomonas. BCNU 106 was distinguishable from other Pseudomonas strains that are tolerant to organic solvents in that the isolate had the ability to utilize all three xylene isomers as well as benzene, toluene and ethylbenzene. The unique properties of the isolate such as solvent-tolerance and the ability to degrade xylene isomers may have important implications for the efficient treatment of solvent wastes.
성인 철결핍성 빈혈 환자에서 자연 살상 세포 활성의 변화
김수홍,서정훈,김양수,어완규 고신대학교 의학부 2005 高神大學校 醫學部 論文集 Vol.20 No.1
Background: Iron deficiency is the most common casue of anemia worldwide. It is well known that iron plays an important role in the metabolism of may bacterial species. A reduction in immune competence by iron deficiency or iron excess might lead to an increased susceptibility of the host to infection. Investigations have been reported of alterations in the cell-mediated immune response in iron deficient human patients. Confounding variables in clinical studies, such as additional nutritional deficiencies, pre-existing infection or other concomitant disorder, make it difficult to conclude that iron is the only causative factor in immune alteration. In this study, we investigated the change of the cell-mediated immunity in iron deficiency patients. Methods: Twenty four patients with uncomplicated IDA were included in this study. The blood levels of hemoglobin, RBC indices, serum ferritin, serum iron, and TIBC were measured. The indices of cell-mediated immunity such as CD3, CD56 and NK cell activity were measured. The indices of cell-mediated immunity were compared with each hematologic meal group. The correlations between hematologic indices, iron parameters and the indices of cell mediated immunity were investigated. Results: The natural killer cell activity was significantly correlated with Hb(Spearman r=0.616 p=0.001), MCV(Spearman r=0.678 p=0.000) and MCH(Spearman r=0.721 p=0.000). But there was no significant correlations with iron, ferritin, TIBC and Iron/TIBC ratio. In Mann-Whitney test and Chi-Square test, NK cell activity was significantly associated with MCV, MCH and hemoglobin. Conclusion: There was significantly decreased natural killer cell activity in iron-deficient patients. In this study, hemoglobin, MCV and MCH are parameters of the NK cell activity in cell-mediated immunity. As a result, iron deficiency itself is a determinant of the NK cell activity.
Status and Changes in Chemical Properties of Upland Soil in Gangwon Province between 2001 and 2017
Byeong Sung Yoon,Seung Chul Choi,Soo Jeoung Lim,Su Jeong Heo,Youngho Seo 한국토양비료학회 2020 한국토양비료학회지 Vol.53 No.4
In order to obtain useful information for environment-friendly management of upland soils, the chemical characteristics of 170 upland fields in Gangwon province have been monitored every 4 years since 2001. In 2017, the pH, electrical conductivity (EC), organic matter (OM), and available phosphate (Avail. P₂O₅) of the soil samples were 6.4, 0.89 dS m<SUP>-1</SUP>, 32 g ㎏<SUP>-1</SUP>, and 742 ㎎ ㎏<SUP>-1</SUP>, respectively. The values of exchangeable (Exch.) potassium (K), calcium (Ca) and magnesium (Mg) were 1.18, 7.6, and 2.0 c㏖c ㎏<SUP>-1</SUP>, respectively. In terms of the long-term change, the contents of EC, OM, and Exch. cations in upland soils showed increasing tendency. However, significant changes in the contents of pH and Avail. P₂O₅ were not observed since 2013. The ratio of optimal range of pH and OM in upland fields reduced from 55% in 2001 to 36% in 2017 and from 33% to 27%, respectively. The ratio of excessive range of Exch. cations have increased. Therefore, it is necessary to apply the lime and fertilizers based on the soil test in order to properly manage the soil fertility of the upland soils. Meanwhile, average contents of Cd, Cu, Ni, Pb, Zn, and As were 0.23, 21.0, 13.5, 11.0, 82.6, and 4.8 ㎎ ㎏<SUP>-1</SUP>, respectively. The results from the study imply that environment-friendly soil managements including the cultivation of green manure crop and application of organic composts are necessary to improve the soil chemical properties of upland fields.