Objective To compare the advantages and disadvantages between the discussion teaching round model and the traditional round model in the tralning of medical graduate students. Methods 38 and 41 medical graduate students were practicing under the discussion teaching round model and the traditional round model in our hospital from Jan 2012 to Dec 2012. The questionnalre and the Clinical Skill Test were used to evaluate the teaching effect. The t test group design was used to make comparison between group mean. Results Compared with the traditional round model group, the discussion teaching round model group had higher evaluation to the teaching methods, consciousness of participation, the rounds impressions and clinical thinking cultivation, with statistically significant difference (P<0.05). The total score of the Clinical Skill Test was higher in the discussion teaching round model group than the traditional round model group[(86.4±4.8) vs (78.2±6.4), P=0.02]. Conclusion The discussion teaching round model can improve the quality of clinical practice and is an effective method for the education in medical graduate students.

Objective To establish the method of content determination of chlorogenic acid in Shuanghua eardrop. Methods High performance liquid chromatography (HPLC) was adopted with Kromasil C18 column (5 ?m,4.6 mm?250 mm) and acetonitrile-0.4% phosph acid solution (10∶85) as the mobile phase. The detective wavelength was 328 nm,the flow rate was 1.0 mL/min,column temperature was room temperature. Results Average recovery was 99.8%,relative standard error was 1.51% (n =5). Conclusion The linearity relationship of chlorogenic acid was good at the range of 0.102 4～0.061 44 ?g.

Objective To develop a method for simultaneous determination of 4 compounds in Zhizhu Pills by HPLC.Method Reversed-phase HPLC was used to determine the content of the compounds such as hesperidin,naringin,neohesperidin and atractylenolideⅠ.The column was symmetry C18(250 mm?4.6 mm,5 ?m) with temperature of 30 ℃.Methanol-0.095 %phosphoric acid solution served as the mobile phase by gradient elution.The wavelength of detection was set at 283 nm and 224 nm.The injection volume was 10 ?L and the flow rate was 1.0 mL/min.Results Hesperidin,naringin,neohesperidin and atractylenolideⅠin Zhizhu Pills can be isolated completely.Three batches of samples were determined and the recoveries of naringin,hesperidin,neohesperidin and atractylenolideⅠwere 98.81 %(RSD=1.11 %,n=6),100.63 %(RSD=1.90 %,n=6),99.32 %(RSD=1.44 %,n=6) and 99.65 %(RSD=1.53 %,n=6) respectively.Conclusion This method is accurate,reliable and with good reproducibility.It can be used for the quality control of Zhizhu Pills.

Objective To investigate the relationship between diabetes and bone metabolism and the potential epigenetic mechanisms. Methods BMSCs were cultured for 7 and 15 days in cell culture medium with different concentrations of glucose. The mRNA and protein expression of HDACs and osteogenesis-related genes were detected by RT-PCR and Western blot assay ,respectively. Moreover ,the combination of HDAC to the promoter region of Runx2 was tested by the chromatin immunoprecipitation (ChIP) assay. Results ThemRNA expression of osteogenesis-related genes ,incuding OCN(P < 0.05)and Col1(P < 0.05),in the bone marrow of diabetic mice was significantly reduced compared with the control mice. The mRNA and protein expression of ALP ,OCN ,Runx2 and OSX was gradually reduced with the increasing concentration of glucose ,while HDAC2 mRNA and protein expression was increased. The binding activity of HDAC2 to the upstream and downstream of Runx2 promoter region in 25mM glucose-treated BMSCs was higher than the control group(P < 0.05). Conclusoins Diabetes might repress osteogenesis of BMSCs via inhibiting the activity of Runx2 through upregu-lating the expression of HDAC2.

Objective To investigate the weight,length and scale of normal children′ stools and discuss clinical signification.Met-(hods) The fresh stools of 60 normal children (male 34,female 26)were measured,classify the stools according to Bristol′s scale.Results 1.The average weight of stools in 60 cases was (109.53?52.00) g,of male was (123.79?55.87) g,of female was (90.12?(39.66)) g,there was significant difference between them (t=0.013 P0.05);3.The stools was classified into 7 group according to Bristol′s scale.From 1 grade to 6 grade were 3.30%,(5.10%),5.10%,64.40%,15.30% and 6.80%,respectively,but there was no 7 grade stools.Conclusion The weight,length and scales of normal children′s stools can be used as a sign to evaluate the clonic movement of children,especially in diagnosis and treatment of constipation and stools dryness

Objective To investigate the effect of dexmedetomidine combined anesthesia on postoperative delirium in the elderly patients undergoing hip joint replacement.Methods One hundred and sixty ASA Ⅱ or Ⅲ patients,aged 75-85 yr,with a body mass index of 20-25 kg/m2,scheduled for elective total hip joint replacement under general anesthesia,were randomly divided into 2 groups (n =80 each):sevoflurane-fentanyl control group (group C) and dexmedetomidine-sevoflurane-fentanyl group (group D).Dexmedetomidine was intravenously infused at 0.2 μg· kg-1 · h-1 until the end of operation after a loading dose of 0.6μg/kg over 15 min before induction of anesthesia in group D,while the equal volume of normal saline was infused in group C.Anesthesia was induced with iv injection of fentanyl 2-4 μg/kg and etomidate 0.1-0.3 mg/kg at 5 min after the end of administration of the loading dose.Tracheal intubation was facilitated with cisatracurium 0.15 mg/kg and the patients were mechanically ventilated.Anesthesia was maintained with target-controlled inhalation of sevoflurane (the end-tidal concentration 1％-3％) and intermittent iv boluses of fentanyl 0.05 mg.BIS was maintained at 40-60 during operation.The consumption of etomidate,fentanyl,and sevoflurane,agitation during emergence from anesthesia,and postoperative delirium within 24 h after operation were recorded.Results Compared with group C,the consumption of etomidate,fentanly,and sevoflurane was significantly reduced and the incidences of agitation during emergence from anesthesia and postoperative delirium within 24 h after operation were significantly decreased in group D (P ＜0.05).Conclusion Dexmedetomidine combined anesthesia can reduce the occurrence of postoperative delirium in the elderly patients undergoing hip joint replacement.

Objective To evaluate the effect of dexmedetomidine on intraoperative wake-up test in patients undergoing scoliosis surgery.Methods Sixty ASA Ⅰ patients,aged 13-18 yr,scheduled for elective scoliosis surgery,were randomly divided into 2 groups (n =30 each) ∶ sufentanil group (group S) and dexmedetomidine combined with sufentanil group (group DS).Anesthesia was induced with sufentanil,etomidate and cisatracurium,and maintained with target-controlled inhalation of sevoflurane combined with target-controlled infusion of sufentanil in both groups.In group DS,dexmedetomidine 0.2 μg·kg-1 · h-1 was infused during operation,while the equal volume of normal saline was given instead in group S.Before the wake-up test,cisatracurium infusion was stopped,the end-tidal concentration of sevoflurane was adjusted to 0,and the target effect-site concentration of sufentanil was adjusted to 0.1 and 0.08 ng/ml in groups S and DS,respectively.The wake-up test was performed 5 min later.The wake-up time and bucking/restlessness and cardiovascular events during the wake-up test were recorded.The occurrence of intraoperative awareness was recorded in the patients who were followed up after operation.Results No cardiovascular events occurred during the wake-up test in group DS.The wake-up time was significantly shorter and the incidences of cardiovascular events and bucking/restlessness were significantly lower in group DS than in group S (P ＜ 0.05).No intraoperative awareness occurred in the patients.Conclusion Dexme-detomidine can be used for intraoperative wake-up test in patients undergoing scoliosis surgery,with shorter wakeup time,stable hemodymamics and fewer adverse reactions.

OBJECTIVETo investigate the exerted force in different phases of the female menstrual cycle, as well as the changes in estrogen (E2), osteocalcin (OCN), receptor activator of nuclear factor-kappa B ligand (RANKL), and osteoprotegerin (OPG) levels in the gingival crevicular fluid (GCF) during orthodontic tooth movement, to provide a theoretical basis for the selection of the best opportunity for efficient tooth movement.

METHODSTwelve women (aged 18 years to 28 years) with extracted first premolars had been selected. Six women in the group were randomly selected as the menstrual period group, whereas the remaining six were assigned to the ovulation period group. Right canines were retracted with 1.5 N NiTi close coil spring. GCF samples were collected prior to the force exertion experiments at 0 (T0), 15 (T1), 30 (T2), and 45 d (T3). The levels of E2, OCN, OPG and RANKL in GCF were measured by chemiluminescence and enzymelinked immunosorbent assay.

RESULTSThe E2 and OCN levels were significantly higher in the ovulation period group than in the menstrual period group (P < 0.05). No significant differences were found in RANKL and OPG levels between the two groups (P > 0.05). Finally, no significant difference was found in RANKL/OPG ratio between the two groups (P > 0.05).

CONCLUSIONExerted force on teeth during the menstrual period may promote rapid tooth movement.

BACKGROUND: Embryonic pancreatic tissue is characterized by its abundance, potent in proliferation & differentiation, and minimal immunological rejection. It is widely considered as potential pancreatic endocrinological stem cells resource for treating diabetes mellitus.OBJECTIVE: To investigate the embryonic mouse pancreatic tissue isolation technique and observe the recipients' blood glucose regulatory effects of the grafted embryonic pancreas in an experimental diabetes mellitus mouse model.METHODS: Pancreatic tissue from C57B1/6 mouse embryos at embryonic days 11.5-16.5 was isolated under the stereomicroscope. C57BL/6 mouse models of streptozocin-induced diabetes mellitus were established and then randomly divided into two groups: transplantation group, in which, five pieces of pancreatic tissue of mice at embryonic 16.5 days were transplanted into mouse renal capsule, and sham-operated control group, in which, 0.05 mL RPMI1640 culture medium was injected into mouse renal capsule. When blood glucose level of the transplantation group mouse was≤ 11.2 mmol/L, the endocrine function of embryonic pancreatic tissue transplanted was detected by IPGTT and IPITT methods and then the transplanted graft was removed for observing the blood glucose relapse.RESULTS AND CONCLUSION: Nearly intact pancreatic tissue of mice at embryonic days 11.5-16.5 could be isolated through the use of stereomicroscope. Pancreatic tissue morphology and color of mice ≤ embryonic 12.5 days were difficultly distinguished from adjacent tissue and they could only be isolated carefully according to the relationship with adjacent organs. Pancreatic tissue of mice > embryonic 12.5 days exhibited initial endocrinological tissue morphology mimic white cauliflower. Histological and ELISA examinations showed that embryonic pancreatic tissue could express and secrete insulin and the insulin level was gradually increased with developmental time. Embryonic pancreatic tissue could grow beneath the recipient renal capsule. The insulin and glucagon expression in the post-transplantational pancreatic tissue graft was increased compared with prior to transplantation. These results suggest that pancreatic tissue is a potential stem cell resource for treating the diabetes mellitus.

BACKGROUND:The low output of seed cells and long cycle of traditional ceils culture methods in tendon animal models(rabbits and chicken) restrict the researches of tendon tissue engineering study.OBJECTIVE:To establish an ideal culture protocol of tail tendon in SD rats,to get more seed cells within less time for subsequent engineered tendon construction research.DESIGN,TIME AND SETTING:Controlled observation was performed in the National Key Laboratory of Biotherapy,Department of Stem Cells and Tissue Engineering,Sichuan University between February and November in 2006.MATERIALS:Rat tail tendon cells were harvested from 2 SD rats,aged 7-10 days;human prepuce fibroblasts were offered by National Key Laboratory of Biotherapy,Department of Stem Cells and Tissue Engineering,Sichuan University.METHODS:Tail tendon of SD rats was draw off and cut into pieces,which were then cultured in 10% fetal bovine serum+DFculture medium for getting primary tendoncyte by using suspension tissue culture method. The third generation cells were processed into immuocytochemistry stain with collagen type Ⅰ and Ⅲ,while human prepuce fibroblasts served as controls.Absorbance of stain result was measured by image-pro plus 5.02 for statistical analysis.MAIN OUTCOME MEASURES:Immuocytochemistry stain and absorbance measurement of SD rat tail tendon cells.RESULTS:The second generation of SD rat tail tendon cells were positive for type Ⅰ collagen stain,and negative for type Ⅲ collagen stain;human fibroblast were positive for both Ⅰ and Ⅲ collagen. In the rat tail tendon cells and human flbroblasts,the absorbance value of type Ⅰ collagen expression was dramatically higher than of type Ⅲ collagen(P＜0.05). There was no significant differences addressing the absorbance of type Ⅲ collagen expression between type Ⅰ and Ⅲ collagen of SD rat tail tendon cells and blank control group (P＞0.05).CONCLUSION:Cells cultured from SD rat tail tendon have biological characteristic of tendon cells. Tissue piece suspensionculture can obtain a quantity of primary or subcuitured cells of rat tail tendon within a short time.