Objective: To measure the color of dental CAD/CAM alumina-glass-composites(AGC). Methods: Dental CAD/CAM alumina block were infiltrated at 1 120 ℃ by laboratory made AG1,AG2,AG3 and AG4 color serials of infiltration glass powder and Vita In-Ceram Alumina AL1,AL2,AL3 and AL4 infiltration glass respectively. Specimens were made with the area of 10 mm?10 mm,thickness of 0.5,1 and 1.5 mm respectively. Color parameters were measured by Minolta CM-2600d spectrophotometer. Results:The specimen with the thickness of 1 mm was used as the standard for color measurement.After infiltration with AL1-AL4 glass powder,the color parameters of Vita alumina core ceramic were L*: 69.39-78.41,a*:1.82- 4.02,b*:18.35-24.42,when infiltrated with AG1-AG4 glass powder, the color parameters of CAD/CAM AGC were L*:68.80-78.44,a*:1.32- 4.75,b*:16.85- 21.86. b*value and chroma of the AG3 core ceramic were lower than that of AL3 core ceramic,while a* value was higher.b* value and chroma of the AG1 and AG2 core ceramic were lower than that of AL1 and AL2 core ceramic. The reflectance curve of CAD/CAM AGC infiltrated by AG1-AG4 glass powder demonstrated the similar trend as that of the core ceramic infiltrated by Vita In-Ceram glass powder. Conclusion: The color range and surface reflection rate of laboratory made AG1-AG4 AGC are similar with those of Vita AL1-AL4 In-Ceram Alumina core and may meet the need of color match with veneer ceramics.

objective: To investigate the effects of cerium oxide content on the color of alumina glass composite. Methods: Infiltration glass powder with different content of cerium oxide (1%～4%) were fabricated. Alumina glass composite was prepared by infiltrating molten glass into presintered alumina block at 1 250 ℃ for 2 h, and the color of the alumina glass composite were measured with Minolta chromatic instrument(CR 321) . For comparison, the color of VITA In Ceram alumina technical shade guide was recorded too. Results: After infiltration, the b * range of the alumina glass composite was in accord with that of the shade guide. With the increasing content of the cerium oxide, a *, b * and chroma increased, L * decreased, the hue of the alumina glass composite shifted from yellow green to yellow red. Conclusion: Cerium oxide may effectively enhance b * of the alumina glass composite, but its ability of reducing L * and enhancing a * is weak.

Objective; To study the chromatic distribution of the chromatic value of Vitapan 3D- Master shade guide in color space. Methods: The color space of.Vitapan 3D-Master shade guide was measured and analyzed with CIE-1976-L* a* b. system and MINOLTA chromatic instrument (CR-321 ) under D65 standard source. Results: 26 shades of Vitapan 3D-Master could be divided into 5 groups according to the 3-dimensional layers. Inside the 2nd, 3th and 4th group, 6 shades distributed as equidistant ring circling M2 shade because their hue and chroma were different. The hue of L1. 5 and L2. 5 deflected to yellow, R1.5 and R2. 5 to red,that of M1-3 was intervenient. Conclusion: Vitapan 3D-Master shade guide is equidistant in color space and can be used more effeciently than Vitapan classical. Its chromatic value distribution perfectly and evenly covered color region of nature tooth.

OBJECTIVETo develop an HPLC-DAD-ELSD method for detecting the fingerprint of Astragali Radix and evaluate the quality through similarity calculation and chemical pattern recognition.

METHODSeparation was performed at 25 degreeC on an Agilent Zorbax ODS C18 column(4.6 mm x250 mm,5 microm). Gradient elution was performed with the mobile phases of acetonitrile and water containing 0. 2% formic acid. The flow rate was 0. 8 mL min-1 , and sample size was 10 microL. The UV detection wavelength was set at 280 nm. The drift tube temperature for ELSD was set at 110 degreeC , and the nebulizing gas flow rate was 3.0 L min-1. The similarity calculation and chemical pattern recognition were used for fingerprint analysis.

RESULTThe HPLC-DAD-ELSD method for chromatographic fingerprint of Astragali Radix showed better results of stability, precision and repeatability. The reference chromatographic fingerprint of Astragali Radix was established on the eighteen Astragali Radix samples from different sources. The results of similarity calculation were higher than 0. 83, which was in accordance with the result of chemical pattern recognition analysis.

CONCLUSIONFingerprint and chemical pattern recognition analysis could effectively distinguish Astragali Radix from different source, which could be applied to the quality control of Astragali Radix.

OBJECTIVETo find an inhibitor to reduce the volatilization of formalin.

METHODThe saturated solution of sodium hydrosulphite (SHS) was sprayed on the surface of the anatomy specimens, then the concentration of formaldehyde in the air was tested.

RESULTSThe concentration of formaldehyde in the air of SHS sprayed group [(3.10 +/- 1.22) mg/m3] was significantly lower than that of the control group [(8.36 +/- 4.11) mg/m3, P < 0.01].

CONCLUSIONSHS may be a volatilization inhibitor for formalin, which could reduce the concentration of formaldehyde in the air.

Objective:To analyze the practice and experience of " patient-centered, popularizing multi-disciplinary team(MDT) mode" in medical institutions, and to put forward reasonable suggestions and opinions for medical institutions to further improve and popularize MDT mode.Methods:Based on the evaluation of China Healthcare Improvement Initiative, 40 typical cases of MDT in medical institutions were collected, and descriptive analysis and textual analysis were carried out on the cases.Results:There were more specialized hospitals carrying out MDT, the application scope of MDT services was constantly expanding, and the management system and diagnosis and treatment process were constantly optimized.Conclusions:The mode of MDT in China is in the stage of exploration and development. In the promotion process, it is necessary to give full play to the role of information means, establish scientific and reasonable cost measurement and charge standard, and improve the enthusiasm of medical institutions and medical personnel to participate in MDT.

To establish the UPLC fingerprint of Zhongyi Angong Niuhuang Pills, in order to evaluate its quality by chemical pattern recognition. The method was developed on a column of Poroshell 120 EC-C_(18), with methanol-0.1% formic acid solution as the mobile phase for gradient elution at a flow rate of 0.4 mL·min~(-1). The column temperature was 30 ℃,and the detective wavelength was 254 nm. The similarity of 24 batches of Angong Niuhuang Pills was compared by using Traditional Chinese Medicine Chromatographic Fingerprint Similarity Evaluation System(2004 A). Hydrophobic cluster analysis,principal components analysis and partial least squares discriminant analysis were conducted by using SIMCA 13.0 software to investigate different components among these products. The UPLC characteristic fingerprint was established in this study. And 17 common peaks were identified by standard reference and UPLC-MS. The similarity of 24 batches samples were above 0.980,which can be classified into three categories for pattern recognition. Baicalin,berberine,jatrorrhizine,wogonin and wogonoside were identified as the main markers that cause differences of various batches. The method is simple,rapid,accurate and reproducible,and can provide scientific basis for improving the quality standard of Zhongyi Angong Niuhuang Pills.
Chromatography, High Pressure Liquid ; Drugs, Chinese Herbal/chemistry* ; Tandem Mass Spectrometry

In order to prevent the canceration of gallbladder polyps or avoid the misdiagnosis of gallbladder cancer,the mainstream practice is cholecystectomy for polyps larger than 1 cm,while gallbladder polyps larger than 0.5 cm as an indication of gallbladder preserving surgery.The reasons for this result is that we put the diameter of more than 1 cm of gallbladder polyps as high risk factors for prediction of gallbladder carcinoma,and we ignored the characteristics of gallbladder polyps that most of them are not gallbladder cancer or are not cancerous even larger than 1 cm.We analysed the high risk factors for gallbladder cancer on the basis of variety of clinical data,and we believe that the most valuable indicator of gallbladder cancer are the growth time of gallbladder polyps,the age of the patients,the combination of gallstones,the single polyps,and the sex.Polyps diameter greater than 1 cm are not a high risk factor for gallbladder cancer.We can use these five high risk factors to manage gallbladder polyps and reduce unnecessary cholecystectomy and gallbladder preserving surgery.

A new method for detection of Escherichia coli exist in licorice decoction was developed by using DNA-based electrochemical biosensor. The thiolated capture probe was immobilized on a gold electrode at first. Then the aptamer for Escherichia coli was combined with the capture probe by hybridization. Due to the stronger interaction between the aptamer and the E. coli, the aptamer can dissociate from the capture probe in the presence of E. coli in licorice decoction. The biotinylated detection probe was hybridized with the single-strand capture probe. As a result, the electrochemical response to Escherichia coli can be measured by using differential pulse voltammetric in the presence of α-naphthyl phosphate. The plot of peak current vs. the logarithm of concentration in the range from 2.7×10² to 2.7×10⁸ CFU·mL⁻¹ displayed a linear relationship with a detection limit of 50 CFU·mL⁻¹. The relative standard deviation of 3 successive scans was 2.5%，2.1%，4.6% for 2×10²，2×10⁴，2×106：⁶ CFU·mL⁻¹ E. coli, respectively. The proposed procedure showed better specificity to E. coli in comparison to Pseudomonas aeruginosa, Staphylococcus aureus and Bacillus subtilis. In the detection of the real extractum glycyrrhizae, the results between the proposed strategy and the GB assay showed high degree of agreement, demonstrating the designed biosensor could be utilized as a powerful tool for microbial examination for traditional Chinese medicine.

To establish the HPLC fingerprint and determine five index components (loganic acid， chlorogenic acid， loganin， sweroside and asperosaponin Ⅵ) of Zishen Yutai pills by high performance liquid chromatography, and provide a scientific basis for its quality control. The fingerprint chromatogram was analysed by the chromatographic fingerprint similarity evaluation system for tradition Chinese medicine (2012), fifteen common peaks were obtained at the wavelength of 254 nm. Different batches of Zishen Yutai pills showed a similarity of above 0.90 in HPLC fingerprint profiles. For the quantitive analysis method, The separation of five components showed good regression (>0.999 2) with linear ranges, and the mean recoveries were in the range of 97.62%-101.9%, with the RSD (=9) less than 3%. The established fingerprint and quantitative analysis methods are highly specific, simple and accurate, which can reflect the quality of Zishen Yutai pills more comprehensively, and can be used for its quality control.