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Keiko Sasaki,Keiji Wada,Yoshiko Tanaka,Teruki Yoshimura,Koozi Matuoka,Takahiko Anno 한국식품영양과학회 2005 Journal of medicinal food Vol.8 No.2
The effects of thyme (Thymus vulgarisL.) leaves and its phenolic compounds, thymol and carvacrol, on theactivities of xenobiotic-metabolizing enzymes, i.e., phase I enzymes such as 7-ethoxycoumarin O-deethylase (ECOD) andphase II enzymes such as glutathione S-transferase (GST) and quinone reductase (QR), were investigated. Mice were fed witha diet containing thyme (0.5% or 2.0%) or treated orally with thymol (50200 mg/kg) or carvacrol (50200 mg/kg) once aday for 7 successive days, and then the enzyme activities in the livers were analyzed. Dietary administration of 2% thymecaused slightly but significantly higher ECOD, GST, and QR activities by 1.11.4-fold. Thymol (200 mg/kg) treatment re-sulted in significantly higher ECOD, GST, and QR activities by 1.31.9-fold, and carvacrol (200 mg/kg) treatment causedsignificantly higher ECOD, GST, and QR activities by 1.31.7-fold. Thymol-treated animals had significantly higher proteinlevels of GST . and GST ., and carvacrol-treated animals had significantly higher levels of GST .. These results imply thatthyme contains bifunctional inducers (i.e., substances capable of inducing both phase I and phase II enzymes) and that thy-mol and carvacrol may account for the effects of thyme.
Cao Vu Dung,Eiichi Sasaki,Keiji Tajima,Toshimitsu Suzuki 한국강구조학회 2015 International Journal of Steel Structures Vol.15 No.2
A common practice for the manufacture of orthotropic steel decks in Japan is to use 75% partial joint penetration welds between closed ribs and deck plates. To evaluate the effectiveness of the proposed 100% penetration on improving the fatigue strength of rib-to-deck welded joints in orthotropic steel bridge decks, four full-scale orthotropic deck specimens were subjected to laboratory testing. Specimens, consisting of a 12-mm-thick deck plate and 6-mm-thick rib, with one closed rib, were fabricated with 75% and 100% penetration. Fatigue test results showed that fatigue cracks initiated from the weld toe inside the rib in the 100% penetration specimens, but from weld root inside the rib in the 75% penetration specimens. To investigate this fatigue behavior, strain measurements were taken at 5 mm from the rib-to-deck weld line. Results of finite element analysis using the effective notch stress method indicate that a deeper partial penetration results in a slightly higher effective notch stress at the weld root of the partial penetration weld. The effective notch stress at the crack initiation location with 100% penetration is lower than that obtained with partial penetration. The open angle appears to have a significant effect on the effective notch stress at the upper weld toe when using 100% penetration. Therefore, the proposed 100% penetration appeared to have a positive effect on enhancing the fatigue resistance of rib-to-deck welded joints.