The study evaluates the lipolysis rate and extent of type Ⅲ lipid formulations using testosterone undecanoate as a model drug after digestion with in vitro lipolysis model, and studies the digestive regularity with optical microscope and electrical conductivity. The results showed that for testosterone undecanoate type Ⅲ lipid formulations with castor oil as oil phase and Transcutol HP as latent solvent, the lipolysis rate and extent were increased with the increase of oil phase proportion and were decreased with excessive proportion of surfactant, in which can see liquid crystal phase during lipolysis process. The lipolysis rate of type ⅢB lipid preparations with different surfactant were ordered as Labrasol > Tween 80 > Cremophor EL, but the rate of type ⅢA is different in quick digestion phase and slow digestion phase. The lipolysis extent of type Ⅲ lipid formulations with different surfactant were ordered as Cremophor EL > Tween 80 > Labrasol. These may be related to the digestive effect of pancreatic lipase on different surfactants. This study implied that the lipolysis rate and extent of type Ⅲ lipid formulations are greatly influenced by the proportion of oil phase and surfactant, and the surfactant structure. These factors will affect the in vivo digestion and should be taken into account when screening type Ⅲ lipid formulations.

Animals ; Brain-Derived Neurotrophic Factor ; pharmacology ; Cell Movement ; drug effects ; Cell Proliferation ; drug effects ; Cells, Cultured ; Chick Embryo ; Chorioallantoic Membrane ; blood supply ; Endothelial Cells ; cytology ; drug effects ; physiology ; Female ; Humans ; Mice ; Mice, Inbred C57BL ; Neovascularization, Physiologic ; drug effects ; Vascular Endothelial Growth Factor A ; pharmacology

OBJECTIVETo evaluate the effect of an 8% arginine-CaCO3 containing desensitizing polishing paste on bonding strength of two self-etching adhesives to dentin.

METHODSThirty-six intact human premolars extracted for orthodontic reasons were collected within 1 month after extraction and randomly assigned into three groups using a table of random numbers (n = 12): specimens without any treatment served as control. In the polishing powder group specimens were polished with a slurry of pumice, and in the desensitizing polishing paste group dentin surfaces of the sample teeth were treated with 8% arginine-CaCO3 containing desensitizing polishing paste. Then each group was divided into two sub-groups using a table of random numbers in order to evaluate the bonding strength of two self-etching adhesive agents (G-Bond, GC; Fl-Bond II, Shofu). Microtensile bond strength test was conducted immediately and after 5000 thermocycling (n = 15). Scanning electron microscope (SEM) was used to evaluate the occluding effect of the desensitizing polishing paste.

RESULTSIn the pre-thermocycling stage, there were no significant differences in Fl-Bond II bonding strength among the three groups [control: (30.34 ± 5.42) MPa, polishing powder group: (29.72 ± 5.16) MPa, desensitizing polishing paste group: (31.53 ± 4.86) MPa] (P > 0.05). However there were significant differences among the three groups in G-Bond bonding strength [control: (38.19 ± 4.42) MPa, polishing powder group: (36.47 ± 4.72) MPa, desensitizing polishing paste group: (46.88 ± 7.83) MPa] (P < 0.05). After thermocycling process, there were no significant differences in bonding strength among the three groups in both G-Bond groups and Fl-Bond II groups. SEM observation showed that the desensitizing polishing paste could occlude open dentinal tubules effectively, and the application of self-etching adhesives could re-open the dentinal tubular orifices. An even layer can be seen on the dentin surface treated with self-etching adhesive containing functional monomers.

CONCLUSIONSThe 8% arginine-CaCO3 containing desensitizing polishing paste could effectively occlude dentinal tubules, thus may have potential benefits in preventing post-operative sensitivity. Additionally, it had no adverse effect on bonding strength of self-etching adhesives to dentin.

Acid Etching, Dental ; Dentin Desensitizing Agents ; Dentin-Bonding Agents ; Humans ; In Vitro Techniques ; Random Allocation ; Tensile Strength

Air ; analysis ; Chromatography, Gas ; methods ; Ethylene Oxide ; analysis ; Furans ; analysis ; Methylene Chloride ; analysis ; Workplace

Objective DNA barcoding technology, a molecular identification method, is applied to distinguishing Bupleuri Radix from its adulterants in order to ensure the quality and clinical curative effect. Methods In this study, the internal transcribed spacer 2 (ITS2) regions of 85 samples were amplified by PCR and sequenced bi-directionally. Obtained sequences were assembled using CodonCode Aligner. The genetic distances were computed by MEGA 6.0 in accordance with the kimura 2-parameter (K2P) model and the phylogenetic tree was constructed by Neighbor-joining (NJ) method. Moreover, the secondary structure of ITS2 was predicted using ITS2 database websites. Results The intra-specific genetic distances were smaller than inter-specific ones in ITS2 regions of Bupleuri Radix. NJ tree and secondary structure results could distinctly differentiate quality product and adulterants. Only 64.7% of the 85 samples were in accordance with the requirements of Chinese Pharmacopoeia. Conclusion ITS2 sequence can accurately and reliably identify the authenticity of Bupleuri Radix and could provide a new technique to ensure clinical safety of this traditional Chinese medicine.

Objective To investigate he diterpenoids from he roots of Illicium majus(Radix Illcii Maji) and their antiviral activity against the Coxsackie B virus. Methods The compounds were isolated by column chromatography over silica gel, octadecylsi-ane chemically bonded silica gel(ODS), and Sephadex HL-20 coupled with preparative HPLC. Their stuctures were elucidated by spectroscopic analysis and the in situ dimolybdenum circular dichroism(CD) method, and their antiviral activities against the Coxsackie B3 virus were evaluated by cytopathic effect(CPE) method. Results Twelve diterpenoids were isolated from the roots of Illicium ma-jus, which were identified as 4-epi-dehydroabietic acid(l), 8,11,13,15-abietatraen-19-oic acid(2), jiadifenoic acids B(3), C(4), G(5) and 1(6), majusanic acids B(7) and D(8), lambertic acid(9), angustanoic acids F(10) and G(ll), and 13-hydroxy-8,11, 13-podocarpatrien-19-oic acid(12). These diterpenoids displayed antiviral activity against the Coxsackie B3 virus, with IC50 values of 3. 3-66. 7 μmol/ml. Conclusion The antiviral activity and cytotoxicity of the diterpenoids relate o he substituent species and position. Compounds 3-6 and 9 were obtained from his plant for the first time.

The paper described the development stages of a hospital performance evaluation scale based on patient experience.An empirical application on 7 856 patients of 26 hospitals in four provinces in the country identified the challenges encountered in the course of its application.These include limits of patients experience,variations on the experience reports incurred by different services experienced by patients,and setting of the patient-inpatient ratio among others.Solutions proposed based on these studies aim at creating a patient experience scale tailored to Chinese patients.

Objective:To meet the individualized needs of residents in standardized residency training of cardiac intervention specialty for cardiac ultrasound teaching, to construct a bionic 3D printing model of ultrasound source, and to discuss its application value in ultrasound teaching and simulation exercises.Methods:Sixty residents majored in cardiovascular medicine receiving standardized residency training of ultrasound in ultrasound imaging department of Renmin Hospital of Wuhan University were randomized into experimental group and control group in average. The experimental group adopted ultrasound bionic 3D printing heart model combined with problem-based learning (PBL) teaching method, and the control group adopted traditional multimedia PPT combined with PBL teaching method. At the end of teaching activities, theoretical examination, operation assessment and questionnaire survey were conducted to evaluate and compare the teaching effect between the two groups. SPSS 21.0 software was performed for t test. Results:The theoretical examination scores of the experimental group and the control group were (81.4±8.2) points and (74.8±9.4) points, respectively, P=0.002, and the operation assessment scores were (89.1±5.6) points and (71.5±8.8) points, respectively, P<0.001. The questionnaire survey showed that the experimental group had better feedbacks than the control group in the aspects of mastery of heart anatomy knowledge, learning experience, learning interest, learning efficiency, understanding of interventional heart disease, clinical skills of interventional operation and overall satisfaction (all P<0.05). Conclusions:Ultrasound bionic 3D printing combined with PBL teaching method can help strengthen the mastery of cardiac anatomy knowledge, promote the learning experience of cardiac ultrasound and improve the skills of interventional operation. The teaching effect is significant and the students' satisfaction is high.

Objective To investigate the prevalence and incidence of Keshan disease (KD) and the selenium concentration of food and hair in residents of Yongjin Village, Fuyu County, Heilongjiang Province, national monitoring site, in 2007. Methods According to the Standard of Keshan Disease Surveillance and the Standard of Diagnosis of Keshan Disease(GB 17021-1997), the residents living in the monitoring site were surveyed by clinical examination and electrocardiography. For individuals whose hearts showed abnormalities, a chest X-ray photograph was taken. The selenium concentrations of the residents' food (flour) and hair were assayed by flowing injection hydride generation atomic fluoremetric method(FI-HG-AFM). Results Nineteen KD patients were found from 282 residents in 2007 KD surveillance. The prevalence of KD, latent KD and chronic KD were 6.7%(19/282), 2.8%(8/282) and 3.9%(11/282), respectively. Five of the 8 latent KD cases were newly found. In addition, there were 5 the suspected KD cases, including 2 suspected chronic KD cases. No acute KD or sub-acute KD patients were found in Yongjin Village at this monitoring site this year. The average selenium concentration of children hair and residents food were (0.3197±0.0586)mg/kg and (0.0210±0.0062)mg/kg, respectively. Conclusions New cases of KD continued to emerge, indicating that etiological factors still exist. Therefore, the emphasis of monitoring KD in furore is founding the consummate report of infectious disease system and training the personnel to increase the reliability of monitoring.

OBJECTIVETo evaluate the micropermeability on bonding hydrophobic adhesive to dentin with ethanol-wet bonding under simulated pulp pressure.

METHODSTwenty-four intact human third molars were used in the study. After the enamel of occlusal surfaces was removed, the molars were randomly divided into six groups. Adper Scotchbond Multi-Purpose was used in the control group; in the experimental groups, the dentin surfaces were saturated with ethanol for 20 s (group 1), 1 min (group 2), 2 min (group 3), 3 min (group 4) or with a series of increasing ethanol concentrations before application of hydrophobic adhesive (group 5). All the bonding procedures were done under simulated pulp pressure. After 24 hours, micro-tensile bond strength test were performed on the specimens. Bonding interfaces were observed under laser scanning confocal microscope (LSCM) after the pulp chamber were filled with a water-soluble fluoroprobe rhodamine B for 3 hours.

RESULTSCompared with the control group [(38.14 ± 4.97) MPa], bond strengths in group 1 [(21.02 ± 7.23) MPa] and group 2 [(29.64 ± 3.81) MPa] were statistically lower (P > 0.05), while bond strength in group 3 [(38.40 ± 5.03) MPa], group 4 [(37.26 ± 4.68) MPa] and group 5 [(40.12 ± 5.95) MPa] were similar to the control group (P < 0.05). The images taken by LSCM showed that with extension of ethanol-wet time, the deposition of fluorescent dye in hybrid layer and along the dentinal tubules decreased gradually. Especially in group 5, only spare fluorescent dye deposition could be detected in the hybrid layer.

CONCLUSIONSDentin saturated with ethanol for more than 2 min before bonding hydrophobic adhesive to dentin could provide favorable bond strength and decreased the micropermeability of bonding interfaces under simulated pulp pressure.

Acid Etching, Dental ; Composite Resins ; Dental Bonding ; Dental Cements ; Dental Enamel ; Dental Pulp Cavity ; Dentin ; Dentin-Bonding Agents ; Ethanol ; Humans ; Hydrophobic and Hydrophilic Interactions ; Materials Testing ; Resin Cements ; Tensile Strength ; Water