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A Novel Chitinolytic Bacterial Strain: Characterization of an Extracellular Chitinase
유아영,박제권 한국키틴키토산학회 2015 한국키틴키토산학회지 Vol.14 No.3
Based on chitinolytic enzyme production, the most potent isolate named as Enterobacter cowanii CH-02 was selected and identified as a novel chitinolytic enzyme producing bacterium. The effects of media composition on bacterial cell growth and chitinase production were also studied. The maximum conditions for chitinase production were obtained at 37°C and pH 8.0 in the presence of colloidal chitin in sea water. E. cowanii CH-02 produced 0.12 U/mg of protein in batch fermentation after 24 h of incubation at 37°C using colloidal chitin in culture medium. The molecular weight of chitinolytic enzyme was estimated to be 52-kDa by SDS-PAGE which was observed in silver staining. To the best of our knowledge, we first report the biochemical function of chitinolytic enzyme from E. cowanii strain.
헬리코박터의 제균 치료 후 과증식 위용종 환자에서 용종의 크기 변화: 전향적 연구
유아영,박종재,주문경,이범재,전훈재,이상우 대한상부위장관ㆍ헬리코박터학회 2019 Korean Journal of Helicobacter Upper Gastrointesti Vol.19 No.4
Background/Aims: Helicobacter pylori (H. pylori) eradication is known to be effective for reducing the size of gastric hyperplastic polyps (HPPs). This study investigated the change in size of gastric HPPs after H. pylori eradication. Materials and Methods: This was a prospective study that enrolled 25 H. pylori-positive patients diagnosed as having HPPs at Korea University Guro Hospital between July 2015 and July 2016. If the patient wanted to receive eradication therapy, medication was given. If the patients refused eradication, only clinical follow-up was performed. All patients were subsequently followed up with endoscopic examination to determine any change in polyp size. Results: Eighteen of the 25 H. pylori-positive patients diagnosed as having HPPs were given an eradication regimen, and 17 were confirmed to have achieved successful eradication. Twelve (70.8%) of the 17 patients in the eradication group showed ≥50% reduction in size, while two (25.0%) of the eight patients in the non-eradication group showed 50% reduction. The polyp regression rate was significantly higher in the eradication group (P=0.03). A multivariate analysis revealed that H. pylori eradication (OR, 40.047; 95% CI, 1.112~1442.767; P=0.044) and female sex (OR, 12.947; 95% CI, 1.038~161.503; P=0.047) were significant predictive factors of HPP regression. Conclusions: H. pylori eradication is an effective therapeutic modality for gastric HPP regression.
정지기 Salmonella typhimurium 세포에서 특이적으로 발현되는 세포질 단백질의 동정 및 발현조절에 대한 연구
유아영,김영희,유종언,김삼웅,백형석,강호영,Yoo, Ah-Young,Kim, Young-Hee,Yu, Jong-Earn,Kim, Sam-Woong,Baik, Hyung-Suk,Kang, Ho-Young 한국생명과학회 2007 생명과학회지 Vol.17 No.2
Salmoenella는 대표적인 intracellular pathogen으로 숙주의 면역 세포인 macrophage 내에서 살아남아 이들을 매개로 숙주의 몸 전체를 이동해 가면서 전신성 감염을 일으킨다. 살모넬라는 숙주 세포 내부의 이러한 극한 환경을 극복하기 위해서 다양한 방어 기작을 가진다. 본 연구에서는 복합적인 스트레스가 작용하는 정지기 Salmonella에서 특이적으로 발현되는 단백질에 주목하였다. 정지기 상태의 Salmonella에서 약 20 kDa의 단백질이 특이적으로 많이 발현되었으며, 세포질 분획을 통해 이 단백질이 세포질 부분에 존재함을 알 수 있었다. MALDI-TOF 분석을 통해 이 단백질이 $\b{D}NA$ binding $\b{p}rotein$ in $\b{s}tationary$ phase (Dps) 단백질임을 확인하였다. Dps 단백질은 스트레스가 주어진 상황에서 DNA에 비특이적으로 결합하여 DNA가 안정한 형태를 유지하도록 하여 스트레스로부터 염색체를 보호하는 역할을 하는 것으로 알려져 있다. 이후의 연구를 위하여 과발현하여 정제한 Dps 단백질을 토끼에 주사하여 Dps 특이적인 항체를 제조하였다. dps 발현에 영향을 미치는 조절자 단백질을 알기 위하여 다양한 S. typhimrium 돌연변이주들 내에서의 Dps 단백질양을 조사하였다. Salmonella is facultative intracellular pathogen that can survive and replicate in macrophages even though these cells are equipped with a plethora of anti-microbial mechanisms. To survive in this hostile intracellular environment, Salmonella has evolved numerous defense mechartisms. An approximately 20 kDa protein was detected as a stationary-phase specific protein band in cytosolic fraction. It was identified as a DNA binding protein in stationary phase (Dps) by analysis of MALDI-TOF assay. It has been known that Dps, the protein produced in the stationary phase of bacteria, allows DNA to form chromatin by binding to DNA nonspecifically and protects DNA from reactive oxidative species (ROS). For further study, Dps specific polyclonal antibodies were generated by injection of purified Dps protein into rabbit. To examine the Finfluence of several regulatory proteins in the expression dps gene, Dps protein level in various S. typhimurium mutants defecting regulatory proteins were investigated by Westernblot using Dps specific polyclonal antibodies.