http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
- 中文 을 입력하시려면 zhongwen을 입력하시고 space를누르시면됩니다.
- 北京 을 입력하시려면 beijing을 입력하시고 space를 누르시면 됩니다.
RISS 인기검색어
- 검색키워드
- 저자 : Liangdong Feng (검색결과 2 건)
- 무료
- 기관 내 무료
- 유료
-
Preparation and adsorption characters of Cu(II)-imprinted chitosan/attapulgite polymer
Yingying Shi,Qianghua Zhang,Liangdong Feng,Qingping Xiong,Jing Chen 한국화학공학회 2014 Korean Journal of Chemical Engineering Vol.31 No.5
Using attapulgite (ATP) as matrix, chitosan (CS) as functional monomer, and introducing the surface ionimprintingconcept, a new Cu(II)-IIP was prepared, and characterized by SEM, XRD and FT-IR. The adsorption ofCu(II) aqueous solution with Cu(II)-IIP was investigated by flame atomic adsorption spectroscopy (FAAS). The polymerhas good selectivity for Cu(II) from competitive metal ions, and the selectivity coefficient of Cu(II) relation to Pb(II),Cd(II) was 78.45 and 82.44, respectively. Sorption equilibrium isotherms could be described by Langmuir and Freundlichmodels; the Freundlich isotherm has shown the best agreement with experimental data, and experimental value of maximumadsorption capacity for Cu(II) was 35.20 mg/g. The obtained thermodynamic parameter (ΔGo, ΔHo, ΔSo) showedthat the Cu(II) adsorption process is a spontaneous and endothermic process. The kinetic data showed that pseudosecond-order kinetic model agrees very well with the dynamic behavior for the sorption of Cu(II) onto Cu(II)-IIP.
-
Liang Dong,Feng Li,Yongzhe Piao,Dong Sun,Rui Zhao,Cheng Li,Lina Cong,Changxin Zhao 한국응용생명화학회 2015 Applied Biological Chemistry (Appl Biol Chem) Vol.58 No.2
High sugar concentration culturing was commonly used in modern fermentation industry. However, it leads to the reduction of the foam stability in beer brewing due to the excess secretion of proteinase A. To better understand the characterization of proteinase A excretion from Saccharomyces cerevisiae in high sugar stress conditions, the cultures were grown by using YNB medium with a high concentration of glucose. Pro-PrA isolated from the medium was purified by gel exclusion chromatography, and the PrA activity was detected using fluorescent substrate analysis. The relative molecular weight of the purified PrA and pro-PrA was estimated at 42 and 54 kDa, respectively, by SDS-PAGE. It indicated that the metabolic behavior of PrA in the high glucose culturing was quite different from the normal conditions, and glucose concentration may have a big influence on its secreted process. Further study showed that PrA was released at the logarithmic growth phase of the culturing, and the amount of PrA was 11 times higher compared with the normal culturing. PrA was considered to be activated by itself under acidic conditions. And it was also confirmed in this work that the step-wise pathway for the autoactivation known as a pseudo-PrA has a major contribution to the autoactivation process of PrA zymogen outside the cell.
연관 검색어 추천
이 검색어로 많이 본 자료
활용도 높은 자료
