Background: Mining new whitening ingredients from plants is an effective way to develop new cosmetic products. Bakuchiol, as one of the main active ingredients from the seeds of Psoralea corylifolia L, displays whitening, antioxidant, antiaging, and free radical-scavenging activities and attracts wide attention especially in the cosmetics industry. However, environmentally friendly extraction technologies with high efficiency and high product purity remain to be developed for the scale production of bakuchiol. Objective: In this study, a new approach (acetic acid-steaming-assisted technique) was developed to improve the extraction efficiency of bakuchiol. Methods: The factors influencing the extraction efficiency of bakuchiol, including seed powder granularity, acetic acid volume, temperature, and time, were optimized based on single-factor experiments. Results: The extraction conditions were optimized as steaming the seed powder (100 g) of 40-100 meshes with acetic acid (50 mL) for 10 minutes, from which a crude extract (25.1 g) containing bakuchiol was obtained. High purity (99.1) of bakuchiol (6.02 g) was then prepared by silica gel column chromatography in a one-step process. The method established in this study had higher extraction rate than other methods. The antioxidant potential of bakuchiol was evaluated based on the ABTS free radical scavenging activity and ferric reducing antioxidant power. Furthermore, bakuchiol demonstrated stronger tyrosinase inhibitory activity than the positive control (arbutin). Conclusions: Compared with the available methods, the method established in this study has increased extraction rate of bakuchiol and is environmentally friendly and economical, demonstrating the potential for industrial production.

Objective To summarize and analyze the present situation, hotspot and development trend of the research and practice about the formative assessment in Chinese medical teaching reform by bibliometrics, and provide a quantitative method for the study of formative assessment. Methods We took 567 journals about formative assessment from CNKI database as the research object, making co-word clus-tering and multidimensional scaling analysis as the main research method, and using Bicomb co-word anal-ysis software and SPSS to complete content data statistics and analysis. Result The knowledge map of formative assessment research can be divided into 7 fields: field 1 shows that most studies are mainly focused on practical research, the effectiveness evaluation on application are mainly focused on the improve-ment of students' independent learning ability. The proportion of research in traditional Chinese medicine colleges or universities is increasing, researches of clinical teaching take an important position, and nursing educations are paying more attention as well. Field 2 and field 4 show the synchronization between assess-ment reform and teaching content/strategy reform. Field 3 presents the general situation of teaching evaluation research in higher vocational colleges. Field 5 shows the theme of exploring the establishment of a formative assessment system . Field 6 shows the differences and similarities between examination and assessment . Field 7 shows the overview of medical English courses. Conclusion In the future, we should actively carry out the construction and exploration of the formative assessment system that conforms to China's national conditions, and attach importance to the construction of the sharing platform. We should avoid duplication of research , attach importance to the study and understanding of theoretical connotation and strengthen training, supervision and management.

Objective: To observe the clinical effect of modified colon instillation in the patients with severe acute pancreatitis ( SAP) and intestinal paralysis. Methods:Totally 63 cases of patients with SAP and intestinal paralysis were randomly divided into the treatment group (32 cases) and the control group (31 cases), and they were treated with different enema methods for 15 days. The pe-ripheral venous blood was collected for the detection of serum amylase (AMS), C reactive protein (CRP) and tumor necrosis factor ( TNF-α) before and after the treatment. The abdominal pain, relief time of abdominal pain, recovery time of gastrointestinal function and complications were observed. Results:Compared with those before the treatment, the serum levels of AMS, CRP and TNF-αwere decreased in both groups after the treatment, and the decrease in the treatment group was more notable than that in the control group ( P<0. 05, P<0. 01). The duration of abdominal pain, relief time of abdominal pain and the recovery time of gastrointestinal function in the treatment group were shorter than those in the control group (P<0. 01, P<0. 05). The incidence of complications in the treatment group was 12. 50%, while that in the control group was 35. 48% (P<0. 05). Conclusion:Modified colon instillation can improve the clinical efficacy, shorten the recovery time of gastrointestinal function and reduce the incidence of complications, which is worthy of clinical promotion.

In this experiment the data of the infrared radiation spectrum of acupoints in human body were obtained through an ingenious device. In thirty-one healthy volunteer subjects and thirty-one patients suffering from coronary heart disease, we detected the infrared radiation spectra from some acupoints and compared them with those of the healthy subjects. The curves of patients showed more differences. After analyzing the data, we noted statistically significant differences in some fields between the healthy subjects and the patients. And after reducing the data, we observed significant differences in larger fields. So utilization of reduced data from patients for analysis is our choice.
Acupuncture Points ; Adult ; Aged ; Aged, 80 and over ; Coronary Disease ; physiopathology ; Female ; Humans ; Infrared Rays ; Male ; Middle Aged ; Skin ; physiopathology ; Spectrum Analysis