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Ah-Reum Choi,Sang-Hyun Park,Tae-Hwan Kim 한국초지조사료학회 2020 한국초지조사료학회지 Vol.40 No.4
Pig slurry (PS) is the most applicable recycling option as an alternative organic fertilizer. The application of pig slurry has the risk of air pollution via atmospheric ammonia (NH3) and nitrous oxide (N2O) emission. The zeolite has a porous structure that can accommodate a wide variety of cations, thus utilizing for the potential additive of deodorization and gas adsorption. This study aimed to investigate the possible roles of zeolite in mitigating NH3 and N2O emission from the pig slurry applied to the maize cropping. The experiment was composed of three treatments: 1) non-N fertilized control, 2) pig slurry (PS) and 3) pig slurry mixed with natural zeolite (PZ). Both of NH3 and N2O emission from applied pig slurry highly increased by more than 3-fold compared to non-N fertilized control. The NH3 emission from the pig slurry was dominant during early 14 days after application and 20.1% of reduction by zeolite application was estimated in this period. Total NH3 emission through whole period of measurement was 0.31, 1.33, and 1.14 kg ha-1. Nitrous oxide emission in the plot applied with pig slurry was also reduced by zeolite treatment by 16.3%. Significant increases in forage and ear yield, as well as nutrient values were obtained by pig slurry application, while no significant effects of zeolite were observed. These results indicate that the application of zeolite and pig slurry efficiently reduces the emission of ammonia and nitrous oxide without negative effects on maize crop production.
Choi, Ah Reum,Kim, Se Jun,Jung, Byung Hoon,Jung, Kwang-Hwan Springer International 2013 Applied microbiology and biotechnology Vol.97 No.2
<P>Proteorhodopsin (PR) is a light-driven proton pump that has been found in a variety of marine bacteria. Recently, many PR-like genes were found in non-marine environments. The goal of this study is to explore the function of rhodopsins that exist only as partial proteo-opsin genes using chimeras with marine green PR (GPR). We isolated nine partial genes of PR homologues using polymerase chain reaction (PCR) and chose three homologues of GPR from the surface of the Ganges River, which has earned them the name 'CFR, Chimeric Freshwater Rhodopsin.' In order to characterize the proteins, we constructed the cassette based on GPR sequence without helices C to F and inserted the isolated conserved partial sequences. When expressed in E. coli, we could observe light-driven proton pumping activity similar to proteorhodopsin, however, photocycle kinetics of CFRs are much slower than proteorhodopsin. Half-time decay of O intermediates of CFRs ranged between 143 and 333 ms at pH 10; their absorption maxima were between 515 and 522 nm at pH 7. We can guess that the function of native rhodopsin, a retinal protein of fresh water bacteria, may be a light-driven proton transport based on the results from chimeric freshwater rhodopsins. This approach will enable many labs that keep reporting partial PCR-based opsin sequences to finally characterize their proteins.</P>
Effect of genetic background differences between FVB and C57BL/6 mice in SARS-CoV-2 infection
Ah-Reum Kang,Hyun Ah Noh,Jae Hyung Son,Sun-Min Seo,Ji-Hun Lee,Na-Won Kim,Eun-Seon Yoo,Han-Bi Jeong,Da In On,Ji Yun Jang,Jun-Won Yun,Jun Won Park,Kang-Seuk Choi,Ho-Young Lee,Jun-Young Seo,Ki Taek Nam,J 한국실험동물학회 2022 한국실험동물학회 학술발표대회 논문집 Vol.2022 No.7
Glu-56 in HtrⅠ is critical for phototaxis signaling in Halobacterium salrinarum
Ah Reum Choi,So-Young Kim,Sa-Ryong Yoon,정광환 한국통합생물학회 2005 Animal cells and systems Vol.9 No.3
The attractant (orange light) or repellent (white light) signal is transmitted from SRI (Sensory Rhodopsin I) via protein-protein interaction with its transducer HtrI (Halobacterial Transducer for Sensory Rhodopsin I) which in turn controls a cytoplasmic phospho-transfer pathway that modulates flagella motor switching in Halobacterium salinarum. Some mutations in both SRI and HtrI showed an unusual mutant phenotype called inverted signaling, in which the cell produces a repellent response to normally attractant light. Twelve mutations at the Glutamate 56 (E56) position in the second transmembrane helix of HtrI were introduced by site-specific random mutagenesis. Almost all E56 mutants showed orange-light inverted responses in pH and temperature-dependent manners except E56D and E56Y. Except for these two mutants, all mutants accelerated the S373 decay compared to wild-type at 18oC. This supported that there is an interaction between SRI and the second transmembrane of HtrI. Also a structural model of HtrI based on the Tar crystal structure and the secondary structure prediction program proposed the E56 residue to be in the middle of the proton channel. The most important observation is that the E56 mutant provides the evidence that this residue is very sensitive for signal relay, which can be explained by the open and closed conformations of the channel (A and R conformations) in SRI, as was postulated by the unified conformational shuttling model for transport and signaling.
Glu-56 in Htrl is Critical for Phototaxis Signaling in Halobacterium salinarum
Choi, Ah-Reum,Kim, So-Young,Yoon, Sa-Ryong,Jung, Kwang-Hwan The Korean Society for Integrative Biology 2005 Integrative biosciences Vol.9 No.3
The attractant (orange light) or repellent (white light) signal is transmitted from SRI (Sensory Rhodopsin I) via protein-protein interaction with its transducer Htrl (Halobacterial Transducer for Sensory Rhodopsin I) which in turn controls a cytoplasmic phospho-transfer pathway that modulates flagella motor switching in Halobacterium salinarum. Some mutations in both SRI and Htrl showed an unusual mutant phenotype called inverted signaling, in which the cell produces a repellent response to normally attractant light. Twelve mutations at the Glutamate 56 (E56) position in the second transmembrane helix of Htrl were introduced by site-specific random mutagenesis. Almost all E56 mutants showed orange-light inverted responses in pH and temperature-dependent manners except E56D and E56Y. Except for these two mutants, all mutants accelerated the $S_{373}$ decay compared to wild-type at $18^{\circ}C$. This supported that there is an interaction between SRI and the second transmembrane of Htrl. Also a structural model of Htrl based on the Tar crystal structure and the secondary structure prediction program proposed the E56 residue to be in the middle of the proton channel. The most important observation is that the E56 mutant provides the evidence that this residue is very sensitive for signal relay, which can be explained by the open and closed conformations of the channel (A and R conformations) in SRI, as was postulated by the unified conformational shuttling model for transport and signaling.
설악산 양사면 하천에서의 고도차에 따른 저서성 대형무척추동물 군집의 공간 분포
최아름 ( Ah Reum Choi ),김아름 ( Ah Reum Kim ),손세환 ( Se Hwan Son ),양희정 ( Hee Jung Yang ),공동수 ( Dongsoo Kong ) 한국물환경학회 2014 한국물환경학회지 Vol.30 No.1
There are marked differences in climate condition between east-facing slopes and west-facing slopes in Mt. Seorak (1,708 m). This study was conducted to find out the differences of benthic macroinvertebrate communities between both slopes of Mt. Seorak. Quantitative (Surber net; 30 cm х 30 cm, mesh: 1 mm) and qualitative (Hand net; mesh: 1 mm) samplings ware carried out seasonally in each site which had 100-meter-high difference from November 2010 to November 2011. Most of the survey sites showed sound environmental conditions because they were located in the protection area of the national park. The benthic macroinvertebrates collected from all survey sites were composed of 158 species, 62families, 17 orders, 7 classes and 5phyla. DCA (Detrended Correspondence Analysis) ordination based on the abundance of benthic mactoinvertebrates showed that altitude was a major factor governing the structure of benthic macroinvertebrate community. There was no significant difference of the communities between both slopes.