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미생물 셀룰로오스 생산을 위한 당밀의 전처리 및 생산된 셀룰로오스의 물리화학적 특성
정호일(Ho-Il Jung),정진하(Jin-Ha Jeong),전영동(Young-Dong Jeon),이나리(Na-Ri Lee),박기현(Ki-Hyun Park),김용균(Yong-Gyun Kim),박근태(Geun-Tae Park),손홍주(Hong-Joo Son) 한국생명과학회 2009 생명과학회지 Vol.19 No.10
BC 합성능이 우수하며, 진탕배양에서도 BC를 생산할 수 있는 능력이 있음이 확인된 Aectobacter sp. V6로부터 BC 생산을 위한 당밀 전처리 조건을 검토하였으며, 생산된 BC의 물리화학적 특성을 검토하였다. 당밀을 배지성분으로 사용하기 위해 전처리를 실시한 결과, 1%의 TP가 BC 생산에 가장 효율적이었다. 전처리한 당밀배지를 이용하여 정치 및 진탕배양에서 생산된 BC의 물리화학적 특성을 조사한 결과, 모든 BC는 유화능이 있었으나 유화 안정능은 낮았다. 또한 모든 BC에서 높은 수분 보유능이 나타났으며, 특히 정치배양에서 생산된 BC는 α-cellulose보다 14배 이상 높았다. BC의 점도는 모두 α-cellulose보다 높았으며, 점도계 회전속도의 증가에 따라 급격히 감소하였다. FT-IR을 통한 조성 분석에서 BC는 식물성 셀룰로 오스와 차이가 없었으며, XRD를 통한 결정성 분석에서는 모든 BC가 결정성을 나타내었다. BC의 미세구조를 조사한 결과, 모든 BC가 미세망상구조로 이루어져 있었는데, 이로 인해 BC는 식물성 셀룰로오스와는 달리 독특한 물성을 가지는 것으로 판단되었다. 또한 정치배양에서 생산된 BC는 진탕배양에서 생산된 것보다 셀룰로오스 미세섬유가 조밀하게 얽혀있음을 알 수 있었다. The aim of this study is to investigate cane molasses pretreatments for the production of cellulose by Acetobacter sp. V6, which has excellent bacterial cellulose (BC) producing capacity in the shaking culture. Among pretreatments of cane molasses, 1% (w/v) tricalcium phosphate (TP) treatment was more efficient in BC production. The physico-chemical properties of BCs that were produced in static and shaking cultures were also investigated. Although BC had an emulsifying ability, its emulsion stability was low. Water holding capacity (WHC) of BC was high; the WHC of BC produced in static culture was 14 times higher than that of α-cellulose. In addition, the viscosity of BC was higher than that of α-cellulose. Composition analysis by FT-IR showed no difference in composition between BC and plant cellulose. In the crystallinity analysis by XRD, all BC samples showed crystallinity. All BC samples showed reticulated structures consisting of ultrafine cellulose fibriles. Microfibriles of cellulose from static culture were especially more compact than those of cellulose from shaking culture.
경주 월산리 신라 고분군 출토 단조철기에 나타난 철기기술
정영동 ( Young Dong Jung ),정원섭 ( Won Seop Jung ),최광진 ( Kwang Jin Choi ),박장식 ( Jang Sik Park ) 대한금속재료학회 ( 구 대한금속학회 ) 2006 대한금속·재료학회지 Vol.44 No.5
This work has metallographically examined three forged iron artifacts from the Wolsanni tomb complex constructed by Silla, and identified a pattern in the engineering sequences applied in their manufacture. The specific distribution of such phases as martensite, pearlite and ferrite consistently observed in their microstructure shows that the artifacts were manufactured in a sequence of shape-forging followed by steel-making. This is unique in that shape-forging comes before steel-making as opposed to another sequence where shape-forging comes after steel-making. The choice between these two, determined by the nature of available steel-making and iron-smelting processes, apparently played a crucial role in characterizing a local iron industry in ancient Korea. This article will compare the Wolsanni results with those of the Hwangnam Great Tomb of Silla and the Kaya tomb complex at Daeseongdong, Kimhae, and will propose that Silla and Kaya had developed a similar iron industry based on the production of low C iron and the particular steel-making by carburization. The invention of special iron artifacts named Cheoljeong must have been a necessary requirement for such unique iron technology to be successfully established.
목질계 바이오매스 연소부산물 분석과 모르타르 혼입 평가
정영동 ( Jung Young-dong ),김민수 ( Kim Min-soo ),박원준 ( Park Won-jun ) 한국건축시공학회 2023 한국건축시공학회지 Vol.23 No.6
This research experimentally evaluated the recyclability of four varieties of lignocellulosic fly ash(FA), a by-product from three power plants employing lignocellulosic biomass(Bio-SRF, wood pellets) as a fuel source. Comprehensive analyses were conducted on FA, encompassing both physical parameters (particle shape, size distribution, fineness, and density) and chemical properties(chemical composition and heavy metal content). Mortar test specimens, with FA mixing ratios ranging from 5 to 20%, were produced in compliance with KS L 5405 standards, and their flow and compressive strength were subsequently measured. The test results indicated that the four types of FA exhibited particle sizes approximately between 20~30μm, densities around 2.3~2.5g/cm<sup>3</sup>, and a fineness range of 2,600~ 4,900cm<sup>2</sup>/g. The FA comprised approximately 50~90% of components such as SiO<sub>2</sub>, Al<sub>2</sub>O<sub>3</sub>, Fe<sub>2</sub>O<sub>3</sub>, and CaO, displaying characteristics akin to type-II and type-III FA of KS L 5405 standards, albeit with differences in chlorine and SiO2 content. From the mortar tests, it was observed that the compressive strength of the mortar ranged between 34~47MPa when the pellet combustion FA was mixed in proportions of 5~20%. FA, produced exclusively from the combustion of 100% lignocellulosic fuel, is assessed to possess high recyclability potential as a substitute for conventional admixtures.