• 한국지반환경공학회 논문집
• /
• 제10권6호
• /
• pp.99-103
• /
• 2009

본 연구는 심층혼합공법 시공시 발생되는 슬라임의 공학적 특성에 대한 연구내용이다. 슬라임의 공학적 특성은 문헌 고찰과 일축압축 시험, 투수시험, 슬라임 분리침강시험을 통하여 알아보았다. 슬라임 발생에 대한 현장 조사 결과 교반 날개가 지반에 관입된 후 슬라임이 발생하기 시작하였고, 그 양은 관입이 진행됨에 따라 증가하는 경향을 보였다. 현장에서 채취한 슬라임 시편의 일축압축강도 시험 결과 $929.7{\sim}3,509.8kN/m^2$의 범위로 측정되었고, 일축압축강도는 흙, 시멘트, 주입재의 혼합비에 따라 크게 달라질 수 있음을 확인할 수 있었다. 그리고 투수시험 수행 결과 혼합재가 불투수 막으로 작용하여 $4.53{\times}10^{-7}{\sim}6.62{\times}10^{-6}cm/sec$의 범위로 나타났다. 이에 투수계수 또한 주입재의 혼합율에 따라 달라질 수 있음을 확인할 수 있었다. 실내에서 제작한 슬라임 시료를 고화한 결과 실트와 점토를 혼합한 것과 비교할 때 사질토가 밀실한 개량체가 형성되어 양질의 혼합물을 얻을 수 있었다.

• 상하수도학회지
• /
• 제28권5호
• /
• pp.589-600
• /
• 2014

Tuberculation and slime accumulated in water mains play an important role in modifying water quality of drinking water. Therefore, in this study, it was investigated that what materials were accumulated, and what components were included in the tuberculation and slime of water mains. The Various tuberculation and slime sample were collected from the 12 water mains to analyze their physical and chemical properties and crystal structure. As a analysis method, VSS(Volatile suspended solid), SEM(scanning electron microscope), EDS(Energy Dispersive X-ray spectroscope), ICP(Inductively Coupled Plasma Mass Spectrometer) and XRD(X-Ray Diffractomete) were used. The results of analysis on the samples, the representative materials were verified such as iron corrosion products, the fine sand particles generated during backwash, fine particles of activated carbon, aluminum used in coagulation process, and manganese included in raw water.

• 대한수의학회지
• /
• 제39권4호
• /
• pp.811-818
• /
• 1999

A total of 16 Staphylococcus epidermidis isolates collected from 14 dogs admitted to the Veterinary Medicial Teaching Hospital in Seoul National University over eleven months were examined for in vitro antibiotic susceptibility pattern with minimum inhibitory concentration (MIC) and slime production, a virulence-associated phenotype, and were genetically characterized by pulsed-field gel electrophoresis (PFGE). The frequency of resistance to antimicrobial agents tested was not high, with a susceptibility ranging from 56.3% to 100%. Three strains exhibited multiple drug resistance against amikacin (MIC, $32-64{\mu}g/ml$), ampicillin ($32{\mu}g/ml$), fosfomycin ($32-128{\mu}g/ml$) and gentamicin ($16{\mu}g/ml$). Vancomycin, ciprofloxacin and rifampin were effective antibiotics against the isolates. All isolates were slime producers ; strains isolated from dogs which died of bacteremia were more likely to produce slime than those isolated from dogs which survived. Chromosomal DNA fingerprinting of the isolates yielded 16 different genomic types with few common bands, indicating a variety of clones of S epidermidis were prevalent in the hospital. This study revealed that PFGE is an useful method for the genotype characterization of S epidermidis strains and this organism could probably be pathogenic in some dogs with severe disorders. Further works on a larger number of epidemiologically defined strains are required to assess these results.

• 한국건설순환자원학회논문집
• /
• 제3권2호
• /
• pp.140-145
• /
• 2015

본 연구에서는 박테리아를 활용하여 콘크리트 구조체를 코팅할 수 있는 기초 기술을 개발하는데 중점을 두었다. 박테리아의 자기정화 능력과 함께 콘크리트 내구성 향상을 함께 도모하기 위하여 슬라임 막을 형성하는 박테리아(Rhodobater capsulatus)를 선정하고 이를 흡착하기 위한 기술을 제시하였다. Rhodobater capsulatus의 배지별 슬라임 생성량 및 생장속도 평가결과로부터 최적의 배지조건은 maltose로 평가되었다. 제시된 배지를 기반으로 배양된 Rhodobater capsulatus의 고정화를 위해 흡착제를 활용하였으며 이를 image analysis 통해 흡착특성을 평가하였다. Rhodobater capsulatus 흡착을 위해서는 고 다공성 수지가 추천될 수 있었다.

• 아시안잔디학회지
• /
• 제10권1호
• /
• pp.71-80
• /
• 1996

Fourteen dictyostelids(12 species of genus Dictyostelium. 2 species of genus Polysphonylium) oc-curred in Mt. Chiri Korea. Soils samples were collected from the nine sites. In the broadleaved-deciduous forests and conifers, common species of cellular slime molds are Dictyostelium mucoroides, and D. brefeldianum. Only two species are above 30 in importance value and above 50% in presence. Dominant species in the broadleaved-deciduous forests is D. mecoroides wheras in the conifer forests is D. brefeldianum which was not common until now in Korea, found in the low elevation either. In addition, Five cellular slime molds occured in the Miscanthus sinensis community: 4 species of genus Dictyostelium and 1 species of genus Polysphonylium. Dominant species is D. purpureum. Importance value is very high, 85. This Result is exceptively unusual. It dind't occur in the other sites. Correlation between the altitudes and the occurrence and distribution of dictyostelids was not accurate. Merely dominant species were different according to forest types and organic matter contents in soil. Cellular slime molds have different favorite forest types. And the growth and germination are dependent on the soil enviroryrnental conditions and soil quility. Key words:Dictyostelids, Mt. Chiri D. mecoroides, D. brefeldianum. D. purpureum. Soil quility, Favorite forest type, Soil environmental condition.

• 한국건설순환자원학회논문집
• /
• 제5권4호
• /
• pp.395-402
• /
• 2017

최근 들어 박테리아를 이용하여 콘크리트의 수복하거나 박테리아 대사를 이용한 보수재료에 대한 연구가 수행되고 있다. 본 연구는 박테리아 대사를 이용하여 슬라임을 형성하며 이를 이용한 보수재료의 개발에 대한 기초적 연구로서 박테리아 슬라임을 포함한 시멘트 코팅재의 내구성 평가를 다루고 있다. 기초연구를 위해 4가지 박테리아(Rhodobacter capsulatus, Rhodopseudomonas palustris, Bacillus thuringiensis, Bacillus subtilis)과 2가지 배양조건이 고려되었으며, 제조된 코팅재를 사용하여 황산 5% 수용액에 노출에 따른 강도 변화, 염화물 확산계수, 초음파속도 평가가 수행되었다. 박테리아가 혼입된 코팅재의 경우 강도가 개선되었으며, 황산 5% 수용액 침지 이후에도 7일까지는 강도가 개선되었다. 염화물 확산계수도 Rhodopseudomonas palustris를 제외한 경우 충분한 염해저항성능을 나타내었으며, 초음파 속도 역시 우수하게 평가되었다. 장기열화에 대한 슬라임의 저항과 박테리아의 수명을 연장할 수 있는 호기성 환경이 유지된다면 대상 박테리아는 열화환경에 노출된 콘크리트 구조의 보수재 적용에 사용될 수 있는 공학적 가능성을 보여준다.

• The Journal of Korean Physical Therapy
• /
• 제32권4호
• /
• pp.250-257
• /
• 2020

Purpose: This study examined the effects of training using the slime on the hand function and problem behavior in adults with intellectual disabilities. Methods: Five adults with intellectual disabilities who were judged as Level 1 or Level 2 were selected. The training consisted of one session (50 min)/day, one day/week for 10 weeks (preparatory activities: 5 min, slime activities: 40 min, finishing activities: 5 min) The functions of the hand (Purdue Pegboard Test [PPT], grip strength test [GST]) and problem behavior (Korean Behavior Problems Inventory [KBPI]) were assessed three times (first assessment; pre, second assessment; post-5 weeks, third assessment; post-10 weeks). Wilcoxon signed-rank tests were used to analyze changes in the subjects' performance before and after the intervention. Results: In the PPT, the use of the non-dominant hand was increased significantly (p<0.05). No significant differences were observed in the remaining results, but the mean value increased. In addition, although the problem behavior was not statistically significant, an increase in the problem behavior score was noted. Conclusion: The training using the slime for adults with intellectual disabilities is effective in hand function improvement and reducing problem behavior.

• The Korean Journal of Ecology
• /
• 제21권4호
• /
• pp.351-355
• /
• 1998

This study was carried out to investigate occurrence and distribution of cellular slime molds by vegetation in Mt. Seorak. Eleven species were isolated from surface soil samples as follows: P. violaceum, P. candidum, P. purpureum, D. brefeldianum, D. minutum, D. delicatm, D. crassicaule, D. macrocephalum, D. firmibasis, D. polycephalum and D. implicatum. The dorminant species was D. brefeldinum. D. delicatum, D. implicatum, D. polycephalum and P. candidum of them were isolated rarely in Korea. It can be thought that these results were caused by characteristics of forest zone and geographical condition which Mt. Seorak is located at east side of central areas of Korea.

• The Korean Journal of Ecology
• /
• 제23권4호
• /
• pp.315-321
• /
• 2000

The occurrence and distribution of Dictyostelid cellular slime molds on Mt. Mukak soils with two different vegetation types were investigated. Two plating methods were used for the isolation of dictyostelids following Dr. Hagiwara's method. Dictyostelium and Polysphondylium were isolated in these soils. D. purpureum (subtropical form ) and D. giganteum were observed in both Quercus variabilis and Pinus thunbergii communities soils. D. delicatum, B. sp-1 (D. brefeldianum complex). D. sp-2 (D. brefeldianum complex), D. minutum and P. pallidum complex occurred only in Q. variabilis soil. D. macrocephalum, D. purpureum (temperate form ), D. robustum, D. polycephalum, P. violaceum, and P. pallidium occurred only in P. thunbergii soil. P. pallidium complex is being identified.

• 한국표면공학회지
• /
• 제19권1호
• /
• pp.13-19
• /
• 1986

Manganese in the Anode slime and the paste-positive material of waste-dry cell was recovered by leaching with the hydrochloric acid solution. The impurities (Zn, Fe, Pb), co-leached with manganese were removed from the leached solution prior to electrolysis by hydrometallurgical techniques such as the neutralization with ammonium hydroxide and cementation on manganese powder. The electrodeposition of manganese from the purified chloride solution with sodium selenate was performed. Cathode current efficiency was found to be affected significantly by the concentration of sodium selenate and ammonium chloride salt, bath temperate, current density and PH. The current efficiency of about 88.7% was obtained by electrolysis manganese chloride solution with sodium selenate (0.1/g) at 10$^{\circ}C$.