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The effect of engineered PLGA nanoparticles on nitrifying bacteria in the soil environment
Susmita Das Nishu,Seungbin Park,Yuhyun Ji,Il Han,Jaehong Key,Tae Kwon Lee 한국공업화학회 2020 Journal of Industrial and Engineering Chemistry Vol.84 No.-
As a result of their biodegradability and biocompatibility, various nanoparticles using poly(lactic-coglycolicacid) (PLGA) as a copolymer have shown promising results in biomedical engineeringfields,including molecular imaging and drug delivery. However, the potential nanotoxicity of PLGA-basednanoparticles in the environment was poorly understood. Measurement of bacterial nitrificationactivities and changes in the soil microbial community are both critical parameters that should be used toevaluate potential distrurbances in the functioning of the environmental ecosystem. This study aimed toinvestigate the impact of PLGA nanoparticles with different zeta-potentials on nitrifying bacterialcommunities in the soil environment. In pure culture studies, the ammonia oxidation was inhibited byhigher than 50% when PLGA cocentration is more than 0.05 mg/L or more regardless of zeta potential andexposure time, but the negligible effects were observed on the nitrite oxidation by most conditions. In thesoil microcosm experiment, at the 0.05 concentration of the oparticles, the ammonia and nitriteoxidation were inhibited by more than 50% on thefirst day regardless of the nanoparticle composition,but all the activity was recovered after 14 days. These results provide a fundamental information on thetoxcity of PLGA nanparticles on ecologcial function.
내건성 식물생장 촉진 균주인 Glutamicibacter halophytocola DR408의 유전체 분석
수스미타 다스 니슈,현혜림,이태권,Nishu, Susmita Das,Hyun, Hye Rim,Lee, Tae Kwon The Microbiological Society of Korea 2019 미생물학회지 Vol.55 No.3
제천에서의 콩 근권 시료로부터 분리한 Glutamicibacter halophytocola DR408 균주는 내건성 식물생장촉진력을 보이고 있다. 본 연구에서 DR408 균주의 완전한 유전체 서열을 해독한 결과, 유전체의 크기는 3.77 Mbp였으며, G + C 함량이 60.2%였다. 또한 총 3,352개의 유전자 서열과 65개의 tRNA, 19개의 rRNA, 3개의 ncRNA가 존재하였다. 유전체 분석을 통해 식물의 내건성을 향상시킬 수 있는 삼투질 합성과 식물생장촉진 효소를 코딩하는 유전자를 다수 포함하는 것을 확인하였다. Glutamicibacter halophytocola DR408 isolated from the rhizospheric soil of soybean plant at Jecheon showed drought tolerance and plant growth promotion capacity. The complete genome of strain DR408 comprises 3,770,186 bp, 60.2% GC-content, which include 3,352 protein-coding genes, 64 tRNAs, 19 rRNA, and 3 ncRNA. The genome analysis revealed gene clusters encoding osmolyte synthesis and plant growth promotion enzymes, which are known to contribute to improve drought tolerance of the plant.