• Journal of Microbiology and Biotechnology
• /
• v.16 no.11
• /
• pp.1819-1825
• /
• 2006

Four naphthalene-degrading bacteria (Pseudomonas sp. strains O1, W1, As1, and G1) were isolated feom pollutant-contaminated sites. Examination of their substrate utilization and analyses of key naphthalene-catabolic regulatory genes revealed that the pathway and regulation of naphthalene-degradation in all four strains resemble those of NAH7 from P. putida G7. Superoxide anion production, superoxide dismutase activity, and catalase activity during their growth on naphthalene-amended medium increased significantly, compared with those with glucose-amended medium. Addition of ascorbate, an antioxidant, or ferrous iron ($Fe^{2+}$) increased the growth rates of all tested microorganisms on naphthalene. Northern blot and HPLC analyses showed that both nahA gene expression and naphthalene degradation increased under those conditions. Our data suggest that naphthalene degradation can impose severe oxidative stress, and defenses against oxidative stress would play an important role in the metabolism of naphthalene.

• Imaging Science in Dentistry
• /
• v.41 no.2
• /
• pp.85-88
• /
• 2011

Central odontogenic fibroma is a rare odontogenic neoplasm that originates from odontogenic ectomesenchyme. Here, a case of central odontogenic fibroma in a 17-year-old male is reported. Since the present case showed a multilocular radiolucency with partially ill-defined border between the right mandibular condyle and the distal root of the right mandibular third molar, differential diagnosis involved a wide range of pathosis from benign lesions like ameoloblastic fibroma and odontogenic myxoma to more aggressive lesions such as desmoplastic fibroma, juvenile aggressive fibromatosis, or fibrosarcoma.

• Imaging Science in Dentistry
• /
• v.35 no.4
• /
• pp.221-223
• /
• 2005

A case of osteoporotic bone marrow defect, which appeared as a well-defined multilocular radiolucency overlapping the roots of mandibular right second molar, was reported. On periapical radiograph, a daughter cyst-like radiolucency was seen at the anterior margin of the lesion making it difficult to rule out odontogenic keratocyst.

• Journal of Korean Academy of Oral and Maxillofacial Radiology
• /
• v.27 no.1
• /
• pp.251-262
• /
• 1997

The authors reported 3 cases of cherubism which included easily diagnosable cases with typical clinical and radiologic features and a difficult case in which a through study of familial factor contributed to final correct diagnosis.

• Review of KIISC
• /
• v.19 no.3
• /
• pp.18-21
• /
• 2009

차세대 IPTV 서비스는 4A (Any-time, Anywhere, Any-device, Any-content)를 특징으로 하는 통방 융합의 서비스이다. 4A서비스는 일반 대중이 자유롭게 콘텐츠의 생성과 소비가 가능하며, 전송환경과 디바이스의 종류에 맞게 안전한 미디어 변환과 콘텐츠의 재사용을 가능하게 한다. 본 고에서는 멀티미디어 보안에 적합한 선택적(Selective)보안의 필요성과 이를 근간으로 하여 End-to-End 보안서비스를 제공하는 Transcodable 보안과 현재까지의 연구동향을 살펴본다.

• Macromolecular Research
• /
• v.9 no.3
• /
• pp.157-163
• /
• 2001

The influences of carbon black loading and cure type on the cure characteristics including kinetics and dynamic mechanical properties were investigated for a styrene-butadiene rubber (SBR). The rate constants of accelerated sulfur vulcanization reaction at three different temperatures were determined using a cure rheometer, and they were compared with those from the direct measurement of sulfur concentration. The strain softening behavior under dynamic deformation, known as the Payne effect was also discussed depending on the carbon black loading and cure type.

• Proceedings of the Korean Society for Technology of Plasticity Conference
• /
• 2007.10a
• /
• pp.87-90
• /
• 2007

The evolution of texture and microstructure was tracked for a number of differently cold rolled aluminum sheet and through-thickness layers which were differentiated by different strain states upon preceding deformation. The results substantiate a correlation of deformation texture with the amount of shear applied during cold rolling.

• Korean Journal of Optics and Photonics
• /
• v.16 no.2
• /
• pp.159-161
• /
• 2005

We report the selective area bandgap tuning of multiple quantum well structures by an impurity free vacancy induced quantum well intermixing technique. A 3dB waveguide directional coupler was fabricated in the disordered section of an intermixed quantum well sample as a demonstration of photonic device applications.

• Journal of Ginseng Research
• /
• v.23 no.1 s.53
• /
• pp.55-59
• /
• 1999

For the first time we have developed a simple method for conjugation between ginsenoside Rf (Rf) and bovine serum albumin (BSA) or ovalbumin (OVA) by a periodate oxidation method. The Rf-BSA conjugate is confirmed by ultraviolate (UV) scanning, thin layer chromatography (TLC), and SDS-gel electrophoresis. In UV scanning Rf showed three small peaks approximately at 230, 265 and 280 nm. BSA showed a peak at 280 nm. The Rf-BSA conjugate showed right shifted three peaks that BSA alone did not show. In TLC analysis, the Rf-BSA conjugate did not show mobility in silica gel but showed a slight stream of trace. In SDS-gel electrophoresis, Rf-BSA conjugate show a slight less mobility than BSA alone. Rf-OVA conjugate also showed similar patterns with Rf-BSA conjugate. These results demonstrated that periodate oxidation method could be used to produce a stable Rf-BSA or Rf-OV A conjugate and also could be applied for other ginsenoside(s).

• Journal of Life Science
• /
• v.21 no.11
• /
• pp.1511-1517
• /
• 2011

We isolated a potent phenanthrene-degrading bacterium from oil-contaminated soils of Suzhou, China, and assessed the potential use of these bacteria for bioremediation of soils contaminated by polycyclic aromatic hydrocarbons (PAHs) in a microcosm. Based on 16S rDNA sequencing, we identified this bacteria as Sphigobacterium sp. SW-09. By PCR amplification, we also identified catechol 2,3-dioxygenase genes (nahH genes) mediating PAH degradation. Staphylococcus sp. KW-07, which has been identified in our previous study, showed potential for use in bioremediation of oil-contaminated soils. In this experiment, we compared the rate of phenanthrene-degradation between Staphylococcus sp. KW-07 and Sphingobacterium sp. SW-09 in a microcosm condition. Newly isolated Sphingobacterium sp. SW-09 showed a higher phenanthrene-degradation rate than that of Staphylococcus sp. KW-07 in soil microcosms. Together, our results suggest that the Sphingobacterim sp. SW-09 strain isolated from the Suzhou area may also be useful in bioremediation of PAH-contaminated soils.