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Deposition and XPS Study of Pb, Zr, and Ti Films
Sujin Choi, Juyun Park, Eunkang Jeong, Beob jun Kim, Seo yoon Son, Jeong min Lee, Jin seong Lee, Hee jin Jo, Jihun Park, Yong-Cheol Kang 조선대학교 기초과학연구원 2014 조선자연과학논문집 Vol.7 No.3
Lead zirconate titanate (PZT) is significant material in electrical and optical devices for their ferroelectric, piezoelectric and dielectric properties. In this research, PZT films were fabricated by reactive RF co-sputtering method using Pb, Zr, and Ti targets. From XPS study, lead, zirconium, and titanium are successfully deposited on Si(100) substrate. Thickness of PZT films was measured with a surface profiler and the thickness was decreased as the oxygen gas ratio increased in the sputter gas.
Selective a-glucosidase inhibition by the extract of Ziziphus jujuba Mill. leaf
Youngje Jo,Sujin Hwang,Seokwon Lim,Young Jin Choi 한국산업식품공학회 2017 학술대회 및 심포지엄 Vol.2017 No.11
The prevalence of chronic diseases has increased steadily over the last 20 years. The side effects of drugs used to treat chronic disease have always been a problem, owing to the need for long-term medication. Many studies have attempted to discover drugs from natural sources with fewer side effects. In this study, we investigated the possibility of using jujube leaf as a potential anti-diabetic drug source or food supplement. The IC50 values of acarbose and jujube leaf extract on a-glucosidase were 2.59 and 0.37 mg/mL, respectively. In vitro tests showed that the inhibition of a-glucosidase was maintained after the jujube extract was passed through a simulated digestive system, but no inhibition of a-amylase was observed either before or after the in vitro digestion. The jujube leaf extract showed mixed non-competitive inhibition. Jujube leaf extract is expected to be safer and cheaper than synthetic inhibitors.