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육철,백운화,박관화,Yook, Cheol,Pek, Un-Hua,Park, Kwan-Hwa 한국식품과학회 1991 한국식품과학회지 Vol.23 No.2
옥수수 전분을 propylene oxide와 반응시켜 치환도가 $0.031{\sim}0.147$되는 hydroxypropyl 옥수수 전분을 제조하여 물리화학적 특성을 규명하였다. Hydroxypropylation에 의하여 팽윤력, 용해도 및 물결합 능력이 증가하고 생전분의 효소 분해력이 높아졌으며 요오드 흡착강도가 낮아졌다. 아울러 hydroxypropylation에 의하여 전분의 결정화도도 감소되었다. 한편, 옥수수 전분을 hydroxypropylation시켰을 때 분자량 $1.34{\times}10^7$ 이상의 큰 분자는 감소하였고 $1.34{\times}10^7{\sim}1.18{\times}10^5$의 전분 분자는 증가하였다. Hydroxypropylation에 의하여 옥수수 전분 입자의 형태에는 별 변화가 없었으나 입자크기는 평균입경이 $13.9\;{\mu}m$에서 $16.0\;{\mu}m$로 증가하였다. Hydroxypropylated starches were prepared by reaction of corn starch with propylene oxide and their physicochemical properties were compared with those of the native starch. Swelling power, solubility and water binding capacity increased with the increase of hydroxypropylation. The hydroxypropylation of corn starch significantly reduced the extent of digestion and iodine absorption. Starch molecules larger than $1.34{\times}10^7{\sim}$ decreased whereas molecules ranging from $1.34{\times}10^7{\sim}1.18{\times}10^5$ increased by hydroxypropylation. Granule size increased by hydroxypropylation but this did not significantly affect the granule surface appearance by SEM. The hydroxypropylation improved the solubility and water binding capacity of corn starch.
김상우,이해평,백운화,박선원 ( Sang Woo Kim,Hae Pyung Lee,Un Hua Pek,Sun Won Park ) 한국화학공학회 1992 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.30 No.3
A new methodology for the synthesis of optimum heat exchanger network has been developed. This method is based on the work by Linnhoff and Ahmad which determines the optimum minimum temperature difference(△T_(min)) based on the energy and capital cost target before the synthesis of the heat exchanger network. The proposed method uses the Guthrie`s model for capital cost calculation, cuts down the capital cost according to control of the driving force between hot and cold streams, and handles the match constraints for the intangibles of design such as safety, layout and etc. The software system developed in this study was applied to the Alko process, which is an alcohol production process, for the synthesis of heat exchanger network. It was possible to save about 12% of the total annual cost.
고초균으로부터 β - glucanase 유전자의 분리 및 대장균에서의 발현
서연수,이영호,백운화 ( Yeon Soo Seo,Young Ho Lee,Un Hua Pek ) 생화학분자생물학회 1985 BMB Reports Vol.18 No.4
A gene coding for β-glucanase which can specifically hydorlyze barley β-glucan and lichenan was isolated from Bacillus subtilis ATCC6633 by molecular cloning using a plasmid vector pBR325. 2.1 Kb BamHI-HindIII DNA fragment conferred β-glucanase activity on Escherichia coli HB101 and 1.7 Kb PstI DNA fragment included in 2.1 Kb fragment gave rise to β-glucanase producing colonies, while its expression depended upon its inserting orientation in pUC9. This gene directed efficiently the synthesis of β-glucanase in E. coli. Up to 2496 of total activity was found outside of the cells. Fine restriction map was also constructed for further sequencing analysis. The transcriptional direction of cloned β-glucanase gene was determined and its putative functional unit could be deducted from the molecular weight of β-glucanase and by deletion mapping.
김의식,손광수,지해성,명남진,백운화 ( Eui Sik Kim,Kwang Soo Son,Hae Sung Jee,Nam Jin Myung,Un Hua Pek ) 한국하천호수학회 1996 생태와 환경 Vol.29 No.1
This study was proposed to control algal biomass in order to improve transparency of an artificial pond, using the manipulation of a pond ecosystem. Zooplanktons isolated from natural populations were tested for their algal clearance rate. The size of two ponds were 1,500 and 2,000 m^3, respectively. Average depth of two ponds was shallow around 1 m. Fish were completely excluded from Pond-A instead of introducing zooplanktons, and Pond-B was added fish with the same condition of Pond-A. Turbidity of Pond-A was less than 10 FTU and transparency was about 1 meter depth during the experimental periods(May-Aug., 1995). In contrast, Chl-a and turbidity of Pond-B were 40 FTU and 55㎍·1^-1 and transparency was mostly less than 20 cm during summer season.