활동성 궤양성 대장염 환자에서 발생한 뇌정맥 혈전증 1예

남승우,양석균,정훈용,주연호,홍원선,민영일,김종성,유창식,서대철 大韓消化器病學會 1998 大韓消化器病學會誌 Vol.32 No.3

개량제 종류 및 혼합조건이 탈수특성에 미치는 영향

李元鎬,元聖淵 충주대 산업과학기술연구소 1999 産業科學論文集 Vol.7 No.2

본 연구에서는 슬러지의 탈수효율을 증대시키기 위한 슬러지 개량시 물리 ·화학적 인자들의 영향을 검토하였다. CST는 슬러지의 탈수성을 측정하기 위한 유용한 도구로 기존 탈수성 측정 방법인 SRF와 상관성이 높아 간단하며 신속하고 경제적인 측정이 가능하였다. 바닷물로 응집된 슬러지는 pH가 중성으로 조정되는 경우 슬러지 입자가 해체되어 재결합하기 위해 요구되는 화학약품 요구량은 증대되었다. 탈수 공정에서 혼합은 매우 중요하며 혼합에 의해 슬러지 입자의 크기가 증대 되었다. 하지만, 매우 큰 혼합강도 및 시간에서는 응집물이 파괴되었다. 양이온성 개량제의 이용시 최적 혼합조건은 약 20,000(Gtd)이하에서 관찰되었으며, 슬러지의 성상 및 개량제 주입량에 따라 차이를 보이고 있다. 바닷물 응집 슬러지의 최적 혼합조건은 개량제의 충분 조건에서는 20,000-100,000이었다. 이는 개량제의 충분 조건이 충분치 못한 조건에서 보다 전단력이 증가되었음을 의미한다. 또한 미세 입자가 증가된 조건에서는 최적 혼합 조건이 50,000-300,000으로 증가되었다. 따라서 혼합 조건은 슬러지 탈수를 위한 개량시 중요한 인자이며, 슬러지 개량은 최적의 혼합조건에서 운영함이 바람직하다. In this study, the effect of physo-chemical variables on sludge conditioning of waste sludge was determined to enhance dewaterability of sludges. The Capillary Suction Time (CST) apparatus was observed to provide the first simple, rapid, and inexpensive means for measuring the dewaterability potential of wastewater sludge. Good correlation was also observed between CST and the specific resistance to filtration(SRF). The dewaterability of seawater flocculated sludge was deteriorated with pH adjustment to neutral. pH adjustment of seawater flocculated sludge seems to cause disaggregation of sludge particles, which increase demand for chemicals that recoagulate the fractured aggregates. The mixing characteristics of both the condition and dewatering steps seem to be important in the optimization of the sludge dewatering process. Mixing enhanced initially to increase particle size. However, floc particles were breakup with high mixing intensity and mixing duration. Optimum Gtd values for the seawater flocculated sludge was below 20,000 with use of cationic polyeletrolytes. Optimum Gtd values were varied with dosage of sludge conditioner with sufficient dosage of sludge conditioner With sufficient sludge conditioner, Optimum Gtd value for seawater flocculated tannery sludge ranged from 20,000 - 100,000. This indicates that sludge strength with sufficient dosage of sludge conditioner was enough to stand higher shear force than that with insufficient dose. Also, it was found that optimum Gtd values were significantly increased for dewatering deflocculated sludge of fine particles. In this case, optimum Gtd was ranged from 50,000 - 300,000. Since Gtd was important parameter to improve the dewaterability of conditioned sludge, sludge conditioning process should be operated at optimum range of Gtd.

수면장애의 통합적 치료를 위한 수면센터의 역할

정화경,최희연,김진우,김선종,이승신,배정호,임원정,이향운 이화여자대학교 의과학연구소 2013 EMJ (Ewha medical journal) Vol.36 No.2

The prevalence of sleep disorder is about 30% of the population. Common sleep disorders are insomnia, obstructive sleep apnea, narcolepsy, restless legs syndrome, rapid eye movement sleep behavior disorder and parasomnia. These sleep disorders lead various medical and mental complications. However, most sleep disorders are underdiagnosed and not treated appropriately. Sleep medicine is important for treating these sleep disorders and maintaining general healthy conditions. Specialized and comprehensive treatments for sleep disorder are important in sleep medicine.

Nutrient Removal Using Fermented Organic Acids Derived from the Primary Sludge in the Intermittent Aeration Activated Sludge Process

Seung Yeon Weon,Sang Il Lee,Chan Won Lee 대한환경공학회 2011 Environmental Engineering Research Vol.16 No.4

The two-stage intermittent aeration activated sludge process (IAP) and dynamic-flow intermittent aeration activated sludge process (DFP) were investigated for the nutrient removal of domestic wastewater. Three sets of IAP and one set of DFP were operated. The fermented settled sludge taken from the primary settling tank was added to two IAP and one DFP as an external electron donor, with one IAP, in which an external carbon source was not added, as a control. All the systems were operated at a sludge retention time of 20 days and a hydraulic retention time of 12 hr. A Higher denitrification rate was observed with the fermented settled sludge for the denitrification compared to the process without the addition of the organic source. The result indicates that the fermented acid from the primary domestic sludge has been proved to be an excellent electron donor for denitrification and biological phosphorus removal with IAP and DFP in treating relatively low C/N ratio(Carbon / Nitrogen ratio) wastewater. Phosphate accumulating organisms have a capability of competing with denitrifiers in the presence of volatile organic acids under anoxic conditions.

Niastella koreensis gen. nov., sp. nov. and Niastella yeongjuensis sp. nov., novel members of the phylum Bacteroidetes, isolated from soil cultivated with Korean ginseng.

Weon, Hang-Yeon,Kim, Byung-Yong,Yoo, Seung-Hee,Lee, Seon-Young,Kwon, Soon-Wo,Go, Seung-Joo,Stackebrandt, Erko Society for General Microbiology 2006 International journal of systematic and evolutiona Vol.56 No.8

<P>Two novel strains, GR20-10(T) and GR20-13(T), were isolated from soil using R2A medium. The soil sample was collected from a field in the Yeongju region of Korea that was cultivated with Korean ginseng. Phylogenetic analysis based on 16S rRNA gene sequences indicated that these strains formed a cluster with several uncultured bacterial clones and with Flexibacter filiformis, Flexibacter sancti, Flexibacter japonensis, Cytophaga arvensicola and Flavobacterium ferrugineum (recently reclassified as Terrimonas ferruginea) in the phylum Bacteroidetes. The level of 16S rRNA gene sequence similarity between the two novel strains was 98.9 %. Isolates GR20-10(T) and GR20-13(T) showed the highest sequence similarities to Flexibacter japonensis IFO 16041(T) (91.8 and 91.9 %, respectively) and T. ferruginea ATCC 13524(T) (90.4 and 90.6 %, respectively). The whole-cell fatty acid profiles of the two isolates were similar and their major fatty acids were 15 : 0 iso, 17 : 0 iso 3-OH and 15 : 1 iso G. The major isoprenoid quinone of both strains was MK-7. The G+C contents of GR20-10(T) and GR20-13(T) were 45.8 and 44.3 mol%, respectively. DNA-DNA hybridization (57 % DNA-DNA hybridization value) and phenotypic data indicated that strains GR20-10(T) and GR20-13(T) each belong to a separate species. On the basis of phenotypic and phylogenetic data and genomic distinctiveness, strains GR20-10(T) and GR20-13(T) represent two novel species in a novel genus in the phylum Bacteroidetes; the names Niastella koreensis gen. nov., sp. nov. (the type species; type strain GR20-10(T)=KACC 11465(T)=DSM 17620(T)) and Niastella yeongjuensis sp. nov. (type strain GR20-13(T)=KACC 11466(T)=DSM 17621(T)) are proposed.</P>

Kaistia soli sp. nov., isolated from a wetland in Korea.

Weon, Hang-Yeon,Lee, Chang-Muk,Hong, Seung-Beom,Kim, Byung-Yong,Yoo, Seung-Hee,Kwon, Soon-Wo,Go, Seung-Joo Society for General Microbiology 2008 International journal of systematic and evolutiona Vol.58 No.7

<P>A bacterial strain, 5YN9-8(T), was isolated from a peat layer in Yongneup, Republic of Korea. It was strictly aerobic, Gram-negative, non-motile, short rod- or coccus-shaped and produced ivory-pigmented colonies. Results of 16S rRNA gene sequence analyses indicated a close relationship between this isolate and Kaistia granuli Ko04(T) (97.2 % similarity) and Kaistia adipata Chj404(T) (96.2 % similarity), members of the order Rhizobiales within the Alphaproteobacteria. Predominant cellular fatty acids of strain 5YN9-8(T) were C(18 : 1)omega7c, C(18 : 0), C(19 : 0)omega8c cyclo and C(16 : 0). The DNA G+C content was 67.0 mol%. Phylogenetic, phenotypic and chemotaxonomic data accumulated in this study revealed that the isolate represents a novel species of the genus Kaistia, for which the name Kaistia soli sp. nov. is proposed; strain 5YN9-8(T) (=KACC 12605(T) =DSM 19436(T)) is the type strain.</P>

Chryseobacterium wanjuense sp. nov., isolated from greenhouse soil in Korea.

Weon, Hang-Yeon,Kim, Byung-Yong,Yoo, Seung-Hee,Kwon, Soon-Wo,Cho, Yang-Hee,Go, Seung-Joo,Stackebrandt, Erko Society for General Microbiology 2006 International journal of systematic and evolutiona Vol.56 No.7

<P>A taxonomic study was performed on strain R2A10-2(T), isolated from greenhouse soil cultivated with lettuce (Lactuca sativa L.), collected in Wanju Province, Korea. The bacterial cells were Gram-negative, aerobic, short rods. The growth temperature and pH were 5-35 degrees C and 5.0-9.0, respectively. Phylogenetic analysis based on 16S rRNA gene sequences revealed that this isolate had 93.3-97.7 % similarity to Chryseobacterium species: the highest sequence similarities were to the type strains of Chryseobacterium daecheongense (97.7 %), Chryseobacterium formosense (97.1 %) and Chryseobacterium defluvii (96.9 %). Low levels of DNA-DNA relatedness were found between strain R2A10-2(T) and the type strains of these three species (<28 %). Differences in phenotypic properties were found with respect to Chryseobacterium species with validly published names. The predominant cellular fatty acids were iso-15 : 0 (40.0 %), iso-17 : 0 3-OH (21.9 %), iso-17 : 1omega9c (11.7 %) and summed feature 4 (iso-15 : 0 2-OH and/or 16 : 1omega7c/t, 11.0 %). Menaquinone MK-6 was detected as the sole respiratory quinone. The G+C content of the genomic DNA was 37.8 mol%. On the basis of the genomic and phenotypic evidence, this isolate represents a novel species of the genus Chryseobacterium, for which the name Chryseobacterium wanjuense sp. nov. is proposed. The type strain is R2A10-2(T) (=KACC 11468(T)=DSM 17724(T)).</P>

Chryseobacterium soli sp. nov. and Chryseobacterium jejuense sp. nov., isolated from soil samples from Jeju, Korea.

Weon, Hang-Yeon,Kim, Byung-Yong,Yoo, Seung-Hee,Kwon, Soon-Wo,Stackebrandt, Erko,Go, Seung-Joo Society for General Microbiology 2008 International journal of systematic and evolutiona Vol.58 No.2

<P>Two yellow-pigmented bacterial strains, JS6-6(T) and JS17-8(T), isolated from soil samples from Jeju, Republic of Korea, were studied to determine their taxonomic positions. The cells of the two bacteria were aerobic, Gram-negative, non-motile, straight rods. 16S rRNA gene sequence analysis indicated that both isolates should be placed in the genus Chryseobacterium of the family Flavobacteriaceae. Their 16S rRNA gene sequences showed similarities of 93.7-97.5 % to those of type strains of the genus Chryseobacterium. The values for DNA-DNA relatedness between both strains and type strains of closely related Chryseobacterium species were below 34 %. The fatty acids of the novel strains were similar to those of species of the genus Chryseobacterium. Both strains had MK-6 as the predominant respiratory quinone. The DNA G+C contents of strains JS6-6(T) and JS17-8(T) were 39.9 and 41.4 mol%, respectively. Phylogenetic evidence, together with the DNA-DNA relatedness values and phenotypic characteristics, indicated that strains JS6-6(T) and JS17-8(T) represent two novel species of the genus Chryseobacterium, for which the names Chryseobacterium soli sp. nov. and Chryseobacterium jejuense sp. nov., respectively, are proposed. The type strains of Chryseobacterium soli sp. nov. and Chryseobacterium jejuense sp. nov. are JS6-6(T) (=KACC 12502(T)=DSM 19298(T)) and JS17-8(T) (=KACC 12501(T)=DSM 19299(T)), respectively.</P>

Two novel species, Lysobacter daejeonensis sp. nov. and Lysobacter yangpyeongensis sp. nov., isolated from Korean greenhouse soils.

Weon, Hang-Yeon,Kim, Byung-Yong,Baek, Youn-Kyung,Yoo, Seung-Hee,Kwon, Soon-Wo,Stackebrandt, Erko,Go, Seung-Joo Society for General Microbiology 2006 International journal of systematic and evolutiona Vol.56 No.5

<P>Two bacterial strains were isolated from greenhouse soils of Daejeon and Yangpyeong regions in Korea. The strains, designated GH1-9T and GH19-3T, were Gram-negative and aerobic, with rod-shaped cells. Their DNA G+C contents were 61.7 and 67.3 mol%, respectively. The major fatty acids of strain GH1-9T were iso-C16 : 0, iso-C15 : 0, iso-C14 : 0, iso-C17 : 1omega9c and iso-C11 : 0 3-OH and the major components of strain GH19-3T were iso-C16 : 0, iso-C15 : 0, C16 : 1omega7c alcohol, iso-C17 : 1omega9c and iso-C11 : 0 3-OH. None of the species of the genus Lysobacter with validly published names showed 16S rRNA gene sequence similarity values of more than 97 % with respect to the novel isolates. The closest sequence similarity of strain GH1-9T was with Lysobacter concretion is DSM 16239T (96.4 %), whereas strain GH19-3T showed the highest sequence similarity with Lysobacter enzymogenes DSM 2043T (96.6 %). Polyphasic taxonomic studies indicated that the two strains should be classified as representing novel members of the genus Lysobacter. The names Lysobacter daejeonensis sp. nov. and Lysobacter yangpyeongensis sp. nov. are proposed, with strains GH1-9T (=KACC 11406T=DSM 17634T) and GH19-3T (=KACC 11407T=DSM 17635T), respectively, as the type strains.</P>

Loktanella koreensis sp. nov., isolated from sea sand in Korea.

Weon, Hang-Yeon,Kim, Byung-Yong,Yoo, Seung-Hee,Kim, Jong-Shik,Kwon, Soon-Wo,Go, Seung-Joo,Stackebrandt, Erko Society for General Microbiology 2006 International journal of systematic and evolutiona Vol.56 No.9

<P>A bacterial strain, GA2-M3(T), isolated from a sea-sand sample in Korea, was subjected to polyphasic taxonomic characterization. Cells of strain GA2-M3(T) were Gram-negative, non-motile, non-spore-forming and short rod- to ovoid-shaped. Comparative 16S rRNA gene sequencing studies confirmed that the bacterium fell within the radiation of the genus Loktanella. Similarity levels between the 16S rRNA gene sequence of strain GA2-M3(T) and those of type strains of Loktanella species with validly published names were 93.5-96.1 %; highest sequence similarity was with Loktanella rosea. The G+C content of the genomic DNA of strain GA2-M3(T) was 60.0 mol% and the predominant ubiquinone was Q-10. Major fatty acids were 18 : 1omega7c, 18 : 0 and 18 : 1omega7c 11-methyl. On the basis of the evidence presented, it is proposed that strain GA2-M3(T) represents a novel species, for which the name Loktanella koreensis sp. nov. is proposed. The type strain is GA2-M3(T) (=KACC 11519(T)=DSM 17925(T)).</P>