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Yu-Lin Hsieh,Hsien-Tsung Yao,Ron-Shan Cheng,Meng-Tsan Chiang 한국식품영양과학회 2012 Journal of medicinal food Vol.15 No.5
Chitosan is a natural product derived from chitin. To investigate the hypoglycemic and anti-obesity effects of chitosan, male Sprague–Dawley rats were divided into four groups: normal control, diabetic, and diabetic fed 5% or 7%chitosan. Diabetes was induced in rats by injecting streptozotocin/nicotinamide. After 10 weeks of feeding, the elevated plasma glucose, tumor necrosis factor-a, and interleukin-6 and lower adiponetin levels caused by diabetes were effectively reversed by chitosan treatment. In addition, 7% chitosan feeding also elevated plasma glucagon-like peptide-1 levels and lowered the insulin resistance index (homeostasis model assessment) in diabetic rats. Lower adipocyte granular intensities and higher lipolysis rates in adipose tissues were noted in the 7% chitosan group. Moreover, chitosan feeding reduced hepatic triglyceride and cholesterol contents and increased hepatic peroxisomal proliferator-activated receptor a expression in diabetic rats. Our results indicate that long-term administration of chitosan may reduce insulin resistance through suppression of lipid accumulation in liver and adipose tissues and amelioration of chronic inflammation in diabetic rats.
Wen-Pin Lee,Mei-Ling Li,Yun-Ta Liu,Chung-Ming Lee,Hsien-Tsung Yao 한국식품영양과학회 2021 Journal of medicinal food Vol.24 No.1
Qing-Yu-Mu (QYM) is an herbal formula used to prevent and treat liver disease in Taiwan. In this study, the hepatoprotective effects of QYM were evaluated in two experimental models. First, rats were fed a high-frying oil (FO) diet containing 1.25% QYM for 5 weeks to investigate effects of QYM on hepatic oxidative stress and antioxidant enzyme activities. Then, protective effects of QYM on carbon tetrachloride (CCl4)-induced chronic liver injury were evaluated. Results show that QYM treatment reduced FO diet-induced hepatic lipid peroxidation and reactive oxygen species levels and increased glutathione (GSH) S-transferase activity. A higher reduced GSH/oxidized GSH (GSSG) ratio was observed after QYM treatment. Furthermore, QYM ameliorated CCl4-induced liver injury by reducing the activity of plasma alanine aminotransferase and histological lesions in the liver. QYM also increased the level of hepatic GSH and activities of GSH peroxidase and superoxide dismutase. Finally, chlorogenic acid, chrysophanol, and apigenin were found to be present in relative abundance in QYM. Results show that QYM may exhibit a hepatoprotective effect by reducing oxidative stress and increasing antioxidant activity in the liver.
Low Gate Leakage Current HFET Structure Fabricated by Using a Step-free Airbridge Gate Process
Feng-Tso Chien,Chien-Liang Chan,Chi-Ling Wang,Chien-Nan Liao,Yao-Tsung Tsai,Hsien-Chin Chiu 한국물리학회 2010 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.56 No.3
Conventional heterostructure field-effect transistors (HFETs) have a high gate leakage current due to the gate electrode being in contact with the exposed channel layer and with the carrier-providing layer on the mesa sidewall. In this study, we use a new step-free (SF) air-bridge gate structure to reduce the gate leakage and improve the breakdown voltage. The proposed structure does not increase any MASKs as compared with the conventional process. In addition, this new structure promises a gate-source capacitance smaller than those of conventional heterostructure FET devices. Consequently, the high-frequency performance of the HFETs using the proposed structure can be improved.