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Nagendranatha Reddy, C.,Bae, Sungwoo,Min, Booki Elsevier 2019 Bioresource technology Vol.285 No.-
<P><B>Abstract</B></P> <P>In this study, a semi-pilot scale biotrickling filter (BTF) was operated in a continuous co-current mode to remove high concentration of hydrogen sulfide (H<SUB>2</SUB>S) at optimum operational conditions. The early startup period of 6 days was needed, and then stable removal of H<SUB>2</SUB>S gas at inlet concentrations up to about 2000 ppm was successfully obtained at gas retention time (GRT) of 15 min and liquid recirculation rate (LRR) of 120 ml/min. The elimination capacities (ECs) increased linearly with increase in H<SUB>2</SUB>S loading rates (HLRs up to 38.5 g/m<SUP>3</SUP> h), but a gradual decrease in removal efficiency was observed from a volumetric HLR of 18.1 g/m<SUP>3</SUP> h. The LRR was further decreased from 120 to 30 ml/min, and the minimum liquid–gas ratio of 0.24 was found without decrease in removal efficiency. The MiSeq analysis revealed the presence of sulphur oxidizing bacteria (SOB) dominated by <I>Acidithiobacillus caldus</I> (>97%) at all portions of BTF.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Semi-pilot scale biotrickling filter (BTF) successfully removed high level of H<SUB>2</SUB>S gas. </LI> <LI> Elimination capacity increased almost linearly with loading rates up to 38.5 g/m<SUP>3</SUP> h. </LI> <LI> H<SUB>2</SUB>S at inlet concentrations of 2000 ppm could be removed with >99% efficiency at 15 min retention time. </LI> <LI> <I>Acidithiobacillus caldus</I> was enriched at all portions of BTF during H<SUB>2</SUB>S removal. </LI> </UL> </P>
IL-30† (IL-27A): a familiar stranger in immunity, inflammation, and cancer
Min Booki,Kim Dongkyun,Feige Matthias J. 생화학분자생물학회 2021 Experimental and molecular medicine Vol.53 No.-
Over the years, interleukin (IL)-27 has received much attention because of its highly divergent, sometimes even opposing, functions in immunity. IL-30, the p28 subunit that forms IL-27 together with Ebi3 and is also known as IL-27p28 or IL-27A, has been considered a surrogate to represent IL-27. However, it was later discovered that IL-30 can form complexes with other protein subunits, potentially leading to overlapping or discrete functions. Furthermore, there is emerging evidence that IL-30 itself may perform immunomodulatory functions independent of Ebi3 or other binding partners and that IL-30 production is strongly associated with certain cancers in humans. In this review, we will discuss the biology of IL-30 and other IL-30-associated cytokines and their functions in inflammation and cancer.
Choi, Jeong-A,Hwang, Jae-Hoon,Dempsey, Brian A.,Abou-Shanab, Reda A. I.,Min, Booki,Song, Hocheol,Lee, Dae Sung,Kim, Jung Rae,Cho, Yunchul,Hong, Seungkwan,Jeon, Byong-Hun Royal Society of Chemistry 2011 ENERGY AND ENVIRONMENTAL SCIENCE Vol.4 No.9
<P>The influence of ultrasonication pretreatment on fermentative bioenergy [ethanol/hydrogen (H<SUB>2</SUB>)] production from a newly isolated microalgae biomass (<I>Scenedesmus obliquus</I> YSW15) was investigated. <I>S. obliquus</I> YSW15 biomass was sonicated for 0 min (control), 5 min (short-term treatment), 15 and 60 min (long-term treatment), which caused different states of cell lysis for microbial fermentation. Long-term sonication significantly damaged the microalgal cell integrity, which subsequently enhanced the bioenergy production. The accumulative bioenergy (ethanol/hydrogen) production after long-term sonication was almost 7 times higher than that after short-term treatment or the control. The optimal ratio of microalgal biomass to anaerobic inoculum for higher bioenergy production was 1 : 1. Microscopic analyses with an energy-filtering transmission electron microscope (EF-TEM) and an atomic force microscope (AFM) collectively indicated that cells were significantly damaged during sonication and that the carbohydrates diffused out of the microalgae interiors and accumulated on the microalgae surfaces and/or within the periplasm, which led to enhanced bioaccessibility and bioavailability of the biomass. These results demonstrate that ultrasonication is an effective pretreatment method for enhancing the fermentative bioenergy production from microalgal biomass.</P> <P>Graphic Abstract</P><P>Disintegration of algae cell structures during sonication released more algal cell wall carbohydrates to aqueous media, thereby exposing a larger surface area to fermentative microorganisms. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c1ee01068a'> </P>
혼화재료 및 양생조건에 따른 폴리에틸렌 섬유보강 시멘트 복합재료의 에너지흡수성능 강화
김민재(Kim, Min-Jae),최홍준(Choi, Hong-Joon),전부기(Chun, Booki),신원식(Shin, Wonsik),류두열(Yoo, Doo-Yeol) 한국방재학회 2020 한국방재학회논문집 Vol.20 No.1
본 연구에서는 시멘트 복합재료의 혼화재료 및 양생조건을 조정하여 체적비 2%의 폴리에틸렌 섬유를 혼입한 시멘트 복합재료의에너지흡수성능을 향상시켰다. 사용된 혼화재료는 고로슬래그, 시멘트 킬른 더스트, 석회석 분말, 실리카퓸이고 시멘트 복합재료의 양생조건은 90 ℃, 72시간과 40 ℃, 120시간으로 두 가지이다. 혼화재료의 시멘트 대체율을 기준으로 총 6가지 배합에대하여 압축강도와 직접인장실험을 수행한 후 초고성능 콘크리트 및 ECC의 실험결과와 비교되었다. 실험결과에 따르면90 ℃ 양생기준 최고 압축강도는 117 MPa이고 혼화재료의 시멘트 대체율이 증가함에 따라서 시편의 압축강도가 감소하는것으로 확인되었다. 직접인장 실험의 경우 40 ℃ 양생 시편의 인장강도가 90 ℃ 양생 시편들에 비해서 다소 낮았으나, 인장변형성능이 최대 305%의 증가율을 보이며 7.7%를 기록하였다. 이에 따라서 에너지흡수성능이 80% - 292% 사이의 증가율을 보였다. 또한 미세균열의 수가 크게 증가하고 미세균열의 폭이 감소하는 등 시편들의 균열 및 파괴양상에서도 명확한 차이가 관측되었다. This study aims to enhance the energy absorption capacity of cementitious composites with 2 vol.% of polyethylene fibers, by adjusting mixing ingredients and curing conditions. Ground blast furnace slag, cement kiln dust, limestone powder, and silica fume were incorporated, and two different curing conditions were applied: 72 h of curing at 90 ℃ and 120 h of curing at 40 ℃. Compressive strength test and direct tensile test were performed on 6 mixtures and the test results were compared with those of ultra-high-performance concrete and engineered cementitious composite specimens. The maximum compressive strength of the 6 mixtures was measured to be approximately 117 MPa. The higher cement replacement ratio of the other components resulted in a decrease in the compressive strength of the specimens cured at 90 ℃. In the direct tensile test, the specimens cured at 40 ℃ exhibited lower tensile strength than those cured at 90 ℃, but the strain capacity was increased by approximately 305% and reached 7.7%. This also resulted in an enhancement of the energy absorption capacity from 80%-292% because of the differences in micro-cracking and fracturing behaviors, such as an increase inthe number of micro-cracks and decrease in crack width.
Naresh Kumar, A.,Min, Booki,Venkata Mohan, S. Elsevier 2018 Bioresource Technology Vol.269 No.-
<P><B>Abstract</B></P> <P>The objective of the study was to evaluate the potential application of defatted algal biomass (DAB) residue as a resource for biobased product synthesis in the biorefinery framework. Acid-catalyzed pretreatment of DAB residue resulted in higher reducing sugars (RS) solubilization (0.26 g RS/g DAB) than corresponding base method (0.19 g RS/g DAB). Subsequently, resulting RS were acidogenically fermented for the production of Bio-H<SUB>2</SUB> and short chain carboxylic acids (SCA)/volatile fatty acids (VFA) at varying redox conditions (pH: 6, 7 and 10). Biosystem with pH-6 resulted in higher SCA (0.54 g SCA/g RS) and Bio-H<SUB>2</SUB> production (0.83 l) followed by pH-10 (0.43 g SCA/g RS, 0.71 l) and pH-7 (0.27 g SCA/g RS, 0.48 l). Higher SCA production in pH-6 system resulted in maximum acidification (23%). Algal biomass majorly derived from CO<SUB>2</SUB> and its residues after lipids extraction accounted as major feedstock for acidogenic product synthesis. Evaluation of these studies using DAB residues offers sustainability to algal refineries on its entirety use.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Acid catalyzed pretreatment of DAB residues resulted in higher sugar solubilization. </LI> <LI> Higher biohydrogen production was resulted with pH-6 operation. </LI> <LI> Biosystem redox condition showed influence on SCA production and distribution. </LI> <LI> Use of DAB as a resource renders the sustainability to current algal biorefineries. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>