http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Saiful Hafiz Habib,Dina Kania,Robiah Yunus,Badrul Hisham Mohamad Jan,Dayang Radiah Awang Biak,Rabitah Zakaria 한국화학공학회 2021 Korean Journal of Chemical Engineering Vol.38 No.11
The interaction between methyl ester sulfonate (MES) surfactant and polyacrylamide (PAM) polymer in alkaline-surfactant-polymer (ASP) flooding due to electrostatic charges and hydrophobicity of both elements at the interface was investigated. In the ASP flooding, sodium hydroxide (NaOH) and sodium carbonate (Na2CO3) were used as alkali. At high PAM concentrations, the strong hydrophobic interaction between the PAM backbone and the carbon chain of MES destabilizes surfactant packing at the interface, increasing interfacial tension (IFT). The higher conductivity value of the ASP slug (15mS/cm) compared to the alkali-surfactant (AS) slug (7 mS/cm) indicates a strong electrostatic interaction caused by the rapid mobilization of free surfactant molecules across the PAM backbone at the water– oil interface. The lowest IFT value for ASP flooding was 0.28 mN/m. Sand pack flooding tests showed that the optimum PAM concentration in ASP flooding was 1,000 ppm, resulting in a 20-35% oil recovery. A negative effect of PAM on the oil recovery was observed at a higher PAM concentration of 9,000 ppm. IFT and mobility ratios were irregularly related to the oil recovery. At 1,000 ppm PAM, the oil recovery for ASP slug with MES and commercial surfactant sodium dodecyl sulfate (SDS) was 25% and 20%, respectively, indicating that MES is superior to SDS.
Beng Ti Tey,Mung Ing Chua,Ghee Sung Chua,Michelle Yeen Tan Ng,Dayang Radiah Awang Biak,Wen Siang Tan,Tau Chuan Ling 한국생물공학회 2006 Biotechnology and Bioprocess Engineering Vol.11 No.2
The influence of temperature and agitation on the growth of Escherichia coli expressing hepatitis B core antigen (HBcAg) in stirred tank bioreactor were investigated. The highest specific growth rate for E. coli (0.844 h-1) was achieved at a temperature of 37°C and an agitation speed of 250 rpm. The activation energy for the growth of the E. coli strain W3110IQ in the stirred tank bioreactor was estimated to be 11 kcal/mol. The highest protein yield was achieved at a temperature of 44°C and an agitation speed of 250 rpm. The relative protein concentration at 44°C is 30 and 6% higher compared to that at 30 and 37°C, respectively.
Tey, Beng Ti,Chua, Mung Ing,Chua, Ghee Sung,Ng, Michelle Yeen Tan,Biak, Dayang Radiah Awang,Tan, Wen Siang,Ling, Tau Chuan The Korean Society for Biotechnology and Bioengine 2006 Biotechnology and Bioprocess Engineering Vol.11 No.2
The influence of temperature and agitation on the growth of Escherichia coli expressing hepatitis B core antigen (HBcAg) in stirred tank bioreactor were investigated. The highest specific growth rate for E. coli$(0.844 h^{-1})$ was achieved at a temperature of $37^{\circ}C$ and an agitation speed of 250 rpm. The activation energy for the growth of the E. coli strain W3110lQ in the stirred tank bioreactor was estimated to be 11 kcal/mol. The highest protein yield was achieved at a temperature of $44^{\circ}C$ and an agitation speed of 250 rpm. The relative protein concentration at $44^{\circ}C$ is 30 and 6% higher compared to that at 30 and $37^{\circ}C$, respectively.
Chong, Fui Chin,Tey, Beng Ti,Dom, Zanariah Mohd,Cheong, Kok Hing,Satiawihardja, Budiatman,Ibrahim, Mohd Nordin,Rahman, Russly Abdul,Biak, Dayang Radiah Awang,Ling, Tau Chuan Korean Society for Biotechnology and Bioengineerin 2007 Biotechnology and Bioprocess Engineering Vol.12 No.3
Rice bran lipase (RBL) was delipidated to enhance its stability in organic solvent and its esterification activity at elevated temperature. The esterification activity of delipidated RBL increased as temperature was increased from 45 to $65^{\circ}C$. The esterification activity of delipidated RBL at $65^{\circ}C$ was about 14 times greater than that of the non-delipidated RBL. As temperature was further increased to $75^{\circ}C$, the non-delipidated RBL lost all esterification activity, whereas the delipidated RBL retained approximately 48% of its esterification activity. The delipidated RBL maintained a relative esterification activity greater than 80% after 16 h of incubation in hexane, whereas the non-delipidated RBL maintained a relative esterification activity of only 50%. A method for production of acylglycerol using delipidated RBL to esterify palm oil fatty acid distillate (PFAD) with glycerol in hexane was successfully developed. The effects of reaction temperatures and type of water removal agents (silica gel and molecular sieve) on the degree of esterification were also examined. A 4 h reaction at $65^{\circ}C$, catalyzed by delipidated RBL and using silica gel as the water removal agent resulted in 53.8% esterification. Thin layer chromatography analysis suggested that the esterified product was primarily comprised of mono- and di-acylglycerols.