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Jeong Young Su Lee Jaegi Chun Young-Bum Uhm Young Rang Sun Gwang-Min Kim Yong Min 《Journal of Radioanalytical and Nuclear Chemistry》2021,330(2):513-519
Journal of Radioanalytical and Nuclear Chemistry - The defects due to cold-rolling deformation in the advanced reduced-activation alloy (ARAA) have been analyzed using positron annihilation... 相似文献
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Calcium-stearate has been traditionally produced by chemical methods, producing wastes and requiring high energy because of
high temperature operation. To achieve enzymatic production of calcium-stearate at unfavorable conditions, i.e., pH 10 and
60 °C, suitable lipase was selected and reaction conditions were optimized using calcium hydroxide and hydrogenated beef tallow
as substrates. Under optimum conditions, 95% of beef tallow, in 2.5 h, was converted into calcium-stearate by using commercial
lipase SDL 451. Investigation of the time-course reaction revealed that fatty acid was initially produced by lipase, followed
by conversion into calcium-stearate. The fatty acid production rate was faster than that of the conversion into calcium-stearate
at the beginning of the reaction. Alkaline pH, originating from the addition of calcium hydroxide, increased the converting
reaction. This is the first report demonstrating that chemical production of calcium-stearate can be replaced by enzymatic
reaction, thereby creating a cleaner process. 相似文献
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Enhanced Biodegradation of Hydrocarbons in Soil by Microbial Biosurfactant, Sophorolipid 总被引:2,自引:0,他引:2
Seok-Whan Kang Young-Bum Kim Jae-Dong Shin Eun-Ki Kim 《Applied biochemistry and biotechnology》2010,160(3):780-790
Effectiveness of a microbial biosurfactant, sophorolipid, was evaluated in washing and biodegradation of model hydrocarbons and crude oil in soil. Thirty percent of 2-methylnaphthalene was effectively washed and solubilized with 10 g/L of sophorolipid with similar or higher efficiency than that of commercial surfactants. Addition of sophorolipid in soil increased biodegradation of model compounds: 2-methylnaphthalene (95% degradation in 2 days), hexadecane (97%, 6 days), and pristane (85%, 6 days). Also, effective biodegradation method of crude oil in soil was observed by the addition of sophorolipid, resulting in 80% biodegradation of saturates and 72% aromatics in 8 weeks. These results showed the potentials of the microbial biosurfactant, sophorolipid, as an effective surfactant for soil washing and as an in situ biodegradation enhancer. 相似文献
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