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TiO2 thin films prepared from aqueous solution and their sterilizing capability
Sun Shu-qing,Hu Yan-tao,Xi Zheng-ying,Duan Chun-yan,Meng Yan 한양대학교 세라믹연구소 2006 Journal of Ceramic Processing Research Vol.7 No.1
A liquid phase deposition method (LPD) has been devised for the deposition of TiO2 thin films on glass at a low temperature. The substrates were immersed in a diluted homogeneous aqueous solution which was prepared by mixing equal volumes of ammonium hexauorotitanate and boric acid solution. The TiO2 thin films obtained were well-adhered, homogenous and colored by interference of reflected light. XRD indicated TiO2 thin films showed a high degree of crystallinity and the crystal phase observed was anatase. SEM experiments showed that the films are formed by small crystallites having linear dimensions under 50 nm. Their thickness was in the range of 100~300 nm. The sterilizing experiment of S. aureus and E. coli showed that TiO2 thin films have excellent sterilizing activity. The optimum conditions of the films were with heat treatment at 400oC where their sterilizing percentage reached over 99% after 24h.
Sun, Chang-Qing,Chang, Yu-Bo,Cui, Ling-Ling,Chen, Jia-Jun,Sun, Nan,Zhang, Wei-Jie,Jia, Xiao-Can,Tian, Yuan,Dai, Li-Ping Asian Pacific Journal of Cancer Prevention 2013 Asian Pacific journal of cancer prevention Vol.14 No.5
Gastric cancer is the second most common cause of cancer-related deaths in the world. Although certain dietary factors and lifestyles have been suggested to be associated with gastric carcinogenesis, there have been few investigations focusing on rural areas. A case-control study was therefore carried out to investigate the risk factors of gastric cardia cancer (GCC) in rural areas of Linzhou. A total of 470 newly diagnosed cases of GCC and 470 healthy controls were included. Face-to-face interviews were conducted, using a uniform questionnaire containing questions on demographics, per capita income, living habits, dietary habits and family history of tumors. The relationship between putative risk factors and GCC was assessed by odds ratios (OR) and their 95% confidence intervals (95%CI) derived from conditional logistic regression model by the COXREG command using SPSS 12.00. Multivariate logistic regression analysis was used to evaluate simultaneously the effects of multiple factors and other potential confounding factors. Multivariate logistic analysis showed that smoking (OR=1.939, 95%CI:1.097-3.426), alcohol drinking (OR=2.360, 95%CI: 1.292-4.311), hot food consumption (OR=2.034, 95%CI: 1.507-2.745), fast eating (OR=1.616, 95%CI: 1.171-2.230), mouldy food (OR=4.564, 95%CI: 2.682-7.767), leftover food (OR=1.881. 95%CI: 1.324-2.671), and family history of tumor (OR=2.831, 95%CI: 1.588-5.050) were risk factors for GCC. High per capita income (OR=0.709, 95%CI: 0.533-0.942), high education level (OR=0.354, 95%CI: 0.163-0.765), consumption of fresh fruits (OR=0.186, 95%CI: 0.111-0.311) and vegetables (OR=0.243, 95%CI: 0.142-0.415), and high BMI (OR=0.367, 95%CI: 0.242-0.557) were protective factors for GCC. Our data indicate that unhealthy lifestyle and dietary habits might be important contributors to GCC in this population.
A Theoretical Study on the Mechanism of Decarboxylations for Hydroxymandelate Synthase
Qing-An Qiao,Qiuxian Li,Changchun Liu,Xiao Sun,Honglan Cai,Lixiang Sun,Huayang Wang 대한화학회 2017 Bulletin of the Korean Chemical Society Vol.38 No.6
Hydroxymandelate synthase is one type of alpha-keto acid-dependent oxygenases and plays an important role in the biosynthesis of hydroxyphenyl-pyruvate. The ferrous and ferryl intermediates in the reaction were considered to be very important in the DNA repair process. The mechanism of hydroxymandelate synthase was investigated by a theoretical method based on B3LYP/LACVP*. The data indicated that each decarboxylation went through a process of direct dioxygen insertion. The first oxidative decarboxylation experienced only one transition state, while there were two potential pathways for the second decarboxylation process. The calculation data showed that the stepwise one was favored to the concerted one due to the lower energy barrier. The process to form the iron-superoxide was the rate-limiting step. After two consecutive decarboxylations, a proton transfer reaction was needed to obtain the target products. Two possible transition states were found out to achieve this step. The one with a six-membered ring structure was preferred because of the lower activation energy. In addition, several ferryl species with high spins were captured in the whole process, which could be supplied as requisite substrates for DNA repair reaction.