Objective To analyze the antioxidant activities of extracts from Scutellaria baicalensis Georgi. by different solvents, and to determine the contents of total flavonoids. Methods By employing colorimetric method, contents of total flavonoids in different extracts were determined. The free radical scavenging activity of each extract was measured by DPPH method. Results Different extracts from Scutellaria baicalensis Georgi. by different solvents were provided with DPPH free radical scavenging activities, of which the ethyl alcohol extracts were the highest in scavenging activities. In addition, total flavonoids content of ethyl alcohol extracts was significantly higher than that of others. Conclusion The antioxidant activity of extracts from Scutellaria baicalensis Georgi. was related to the content of total flavonoids in it.

Objective To investigate the potential heart sparing effects of tangential volumetric modulated arc therapy (T-VMAT) by comparing its dosimetric properties with conventional wedged tangential fields (W-TF) technique and 6-field intensity-modulated radiotherapy (6F-IMRT) in the locoregional radiotherapy of left breast cancer after conserving surgery,including internal mammary nodal irradiation.Methods Fifteen patients with left breast cancer were enrolled in this study.Three plans were generated for each patient:W-TF,6F-IMRT and T-VMAT with two arc segments of 50°.The prescription dose to planning tumor volume (PTV) was 50 Gy in 25 fractions.Dose-volume parameters and indices of conformity were calculated and compared for the PTV and organs at risk (OAR).Results Compared with W-TF,T-VMAT not only significantly decreased D D and the high dose areas (above 10 Gy) of the heart and left anterior descending branch (LAD) (P ＜ 0.05),but also had the trend of sparing the V5Gy although there was statistically significant difference (P ＞ 0.05).T-VMAT also significantly decreased Dmean V5Gy,V10Gy and V20Gy of the heart,as well as the D V5Gy and V10 Gy of LAD (P ＜ 0.05),compared to 6F-IMRT.Furthermore,T-VMAT did not result in higher V20Gy of ipsilateral lung and higher V5Gy of contralateral breast compared with W-TF (P ＞ 0.05).T-VMAT achieved distinctly better target coverage and conformity,meanwhile obviously lowered hot volume of V110 compared to W-TF (P ＜ 0.05).Conclusions T-VMAT not only significantly decreased the high dose areas,but also had the trend of sparing the low dose area for the heat and LAD.Moreover,there was no significant difference for V20Gy of ipsilateral lung and V5Gy of contralateral breast between T-VMAT and W-TF.

Objective: To study Duraphat fluoride varnish on the remineralization of demineralized permanent enamel by carbonated beverages. Methods: 30 permanent premolar teeth from 12 to 25 years old young people were collected from orthodontic extraction. Enamel blocks were prepared from each tooth and randomly divided into group A (Coco cola), B(deionized water), C(Coco cola + Duraphat), D(Coco cola + 2％ NaF) and E(Coco cola + artificial saliva) (n = 15), the specinens were respectively treated for 7 d. The enamel surface were observed by scanning electron microscope(SEM). The Ca2 + and P3 + content(weight percentage) were detected by energy spectrum analyzer. Results: The surface of permanent enamel of group A showed a characteristic honeycomb-like appearance, that of group B were smooth. Group C showed irregular large globule deposits on the surface, group D showed some globule structures on the surface, group E showed a little deposits on the surface. Ca2 + and P3 + content of group A was lower than that of group B, in group C was higher than in group E(P＜ 0. 05). Ca2 + content in group D was higher than that in group E(P＜ 0. 05). Conclusion: Duraphat fluoride varnish can promote the remineralization of demineralized permanent enamel by carbonated beverage.