BACKGROUND: Mechanical stimulation plays a necessary regulatory role in developing and repairing many organs and tissues in the human body. Except for biochemical factors, mechanical factors are considered as key regulatory factors that affect the behavior and function of dental pulp stem cells. OBJECTIVE: To review the role and effect of cellular mechanical stimulation on the biological behavior of dental pulp stem cells. METHODS: PubMed, Embase, Medline and CNKI databases were searched for relevant literatures using the keywords of “human dental pulp stem cells (hDPSCs), mechanical strain, mechanical stretch, mechanical tension, shear stress, cell proliferation, osteogenesis differentiation” in English and Chinese, respectively. Fifty-six articles were finally eligible for review, which were closely related to the proliferation and differentiation of dental pulp stem cells under cellular mechanical stimulation. RESULTS AND CONCLUSION: Cellular mechanical stimulation is an important biological factor affecting cell proliferation, differentiation, apoptosis and protein expression. Dental pulp stem cells are mesenchymal stem cells derived from the dental pulp tissue, and their biological behaviors are also affected by cellular mechanical stimulation. Cellular mechanical stimulation is involved in the proliferation, odontogenesis/osteogenesis of dental pulp stem cells. When the dentin is subjected to fluid flow forces, mechanoreceptors are activated to regulate and maintain the integrity of tooth structure. Signal pathways that mediate the biological behavior of dental pulp stem cells include MAPK, Wnt, Akt, BMP-7, and Nrf2/HO-1, which are involved in promoting and inhibiting the proliferation and odontogenesis/osteogenesis of dental pulp stem cells to varying degrees.

0.05).[Conclusion]BMSCs could be successfully differentiated into endothelial cells in vitro,and the functional genes were stably expressed in BMSCs-derived endothelial cells.They are ideal donor cells of tissue engineering vascularization.

Objective:To investigate the effect of sufentanil in preventing the adverse effects of hamabate in the patients undergoing cesarean section.Methods:Forty patients who would have been injected with hamabate were selected,they were undergoing elective cesarean section with continuous epidural anesthesia and randomly divided into sufentanil group and 0.9％ sodium chloride injection group.When the fetus was removed and hamabate was injected,simultaneously patients in sufentanil group were injected sufentanil 0.1 μg/ kg,and patients in 0.9％ sodium chloride group were injected equal dose of normal saline.MAP,HR,SpO2 and RR were monitored in the two groups.Adverse reactions after hamabate injecting into the body of the uteru,such as nausea,vomiting,chest pain,dizziness and facial flushing were recorded,and Ramsay sedation score was recorded before anesthesia,at 30 min after hamabate was injected and at the ending of the operation.Results:After 30 min using hamabate,MAP,H R and RR of sufentanil group were more stable than 0.9％ sodium chloride group(P ＜ 0.05),Ramsay sedation score of sufentanil group was higher than 0.9％ sodium chloride group(P＜0.05).Adverse reactions such as nausea,chest pain,dizziness and facial flushing were lower in sufentanil group than those in 0.9％ sodium chloride group(P ＜0.05).Conclusions.Small doses of sufentanil can reduce the adverse effects of hamabate in cesarean section,and hemodynamic can be more stable,also it is a certain better sedation,and can be usesd safely.

Objective To investigate the types ,specimen types ,department distribution and drug resistance of multi‐drug resist‐ant bacteria in our hospital during the recent 5 years to provide the scientific guidance for the clinical treatment ,prevention and con‐trol of multi‐drug resistant bacteria .Methods The specimens of laboratory bacterial culture positive during 2011-2015 were col‐lected ,and analyzed on the types ,proportion and drug resistance situation of multi‐drug resistant bacteria and their distribution in clinical specimens and clinical departments .Results A total of 2 568 strains of multi‐drug resistant bacteria were isolated and ac‐counted for 37 .41% the positive specimens ,in which top 5 bacteria were Escherichia coli ,Acinetobacter baumannii ,Staphylococcus aureus ,Klebsiella pneumoniae and Pseudomonas aeruginosa;the sputum ,midstream urine ,blood and secretions had the higher posi‐tive rate of multi‐drug resistant bacteria ,while the secretions from the catheter tip and ear discharge had the lower positive rate(P<0 .05);the multi‐drug resistant bacteria had difference among different departments ,in which ICU ,respiratory department and sur‐gery department were highest ,while the lowest was in the spleen and stomach department and breast department ;the resistance of multi‐drug resistant bacteria occurred over a wide range ,which had higher resistance to beta lactam and aminoglycosides and had higher sensitivity to compound antibacterial drugs such as sulfamethoxazole antibiotics and enzyme inhibitors .Conclusion Multi‐drug resistant bacteria are more and more common in clinic .The positive rate is increased year by year .The drug resistant strains widely distributed .The clinical departments should pay high attention to .Rational and scientific use of antibacterial drugs ,strict control of multi‐drug resistant bacterial spread and strength of the patients′isolation have an important significance to effectively prevent and control the multi‐drug resistant bacterial spread .

Objective:To investigate the understanding of microsurgery education for clinical medical students, and the education methods for microsurgery courses in 8 schools.Methods:The questionnaire was designed around four aspects: the learning status of Chinese medical students in microsurgery learning, the impact of microsurgery learning on future career choices, the current situation of opening microsurgery courses in 8 medical schools, and the opinions and suggestions on improving microsurgery learning in China. Electronic and paper questionnaires were combined to evaluate the condition of understanding microsurgery among 1 000 medical students from Peking University Health Science Center and other 7 schools. Then, the validity of the collected questionnaires was reviewed. SPSS 19.0 were applied for data analysis.Results:A total of 808 valid questionnaires were collected (recovery rate=80.8%). Respondents' understanding of microsurgery remained at the level of "just heard" (2.18±2.83), and 98.41% (795/808) of the students believed that microsurgery related disciplines would bring certain help to their future careers. Male students more recognized the impact of microsurgery learning on future career than female students [(6.19±2.36) vs. (5.76±2.09), P< 0.05)]. In these 8 investigated universities, only Shanghai Jiao Tong University School of Medicine and Zhongshan School of Medicine of Sun Yat-sen University conducted a microsurgery course, while 80.01% (531/663) of the students in the other 6 universities wanted to set microsurgery courses. Microsurgery operation observation (86.82%, 701/808), animal models for microsurgery practical training (82.95%, 670/808), and online theory courses (43.18%, 349/808) were able to increase the interest in microsurgery learning for students. Conclusion:Microsurgery course can bring many benefits to medical students, and it is urgent for domestic medical colleges to carry out microsurgery related courses.

Endoscopy ; Humans ; Natural Orifice Endoscopic Surgery ; methods ; Nose ; Pituitary Neoplasms ; surgery ; Quality of Life ; Sphenoid Sinus

Objective To understand the epidemiological status of chronic diseases and its related risk factors among adult residents in Hebei province.Methods A total of 4 200 adults from 20 districts in Hebei province were selected by multistage stratified random sampling method,and they were investigated with questionnaire,and the body measurement and blood sample were analyzed.Results The prevalent rates of overweight,obesity,central obesity,hypertension,dyslipidemia and diabetes mellitus were 35.19%,16.38%,52.98%,38.50%,39.62% and 5.81%,respectively.The age-adjusted rates were 30.28%,14.05%,44.32%,27.86%,32.71% and 4.00%,respectively.The prevalence of chronic diseases was highly associated with age.The prevalence of chronic diseases in male was higher than that in female among people aged under 55 yrs,but lower among people aged over 55 yrs.The rates were higher in urban areas than in rural areas.The prevalence rates of cigarette smoking and alcohol-drinking in male were higher than in female(P

AIM:To study the effects of domestic glimepiride(Gli) on blood sugar,glucose tolerance and release of insulin in rabbits and rats METHODS:Taken the changes of blood sugar level and glucose tolerance before and after giving drug as parameters,the hypoglycemic effect of Gli was observed in rabbits and rats RESULTS:Gli dose-dependly decreased the levels of blood glucose in rats with a decrease of 23% in high-dose group and seemed to be similar to glibenclamide in potency of lowering blood sugar Gli increased release of insulin by 40%～70% in rats and rabbits and was twice as potent as glibenclamide;Glucose tolerance test showed that Gli could restrain the rising of blood glucose at 30 min and 60 min after glucose was administrated ig in rabbits Time-response relation displayed that blood glucose began to drop 30 min after Gli 1 0mg/kg administered and the levels of blood glucose dropped by 40% 3 h later CONCLUSION:The domestic Gli has similar effects to glibenclamide on lowering blood sugar However,its effect on lowering blood sugar seems to be quicker,shorter and more moderate than that of glibenclamide

Based on the comparison of medical humanistic education among The Mainland,Hong Kong and Taiwan,this article arrives at the conclusion that the gap in the field of humanity education in the Mainland is one of the important reasons that cause the ever-tenser physician-patient relationship in nowadays.So we propose the countermeasures actively.By increasing the humanity courses,changing the teaching method,reinforcing the construction of talented staff in humanity,creating the environment for the humanity education and so on,we reinforce humanity quality of medical students in order to improve our medical education.

OBJECTIVE:To evaluate the preventive and therapeutic effects of extract of Curcuma on experimental hyper?lipidemia models in rats and rabbits.METHODS:Hyperlipidemia models of healthy rats and rabbits,fed on a forage containing cholesterol,fat and etc,were established.TG,TC,LDL,HDL and LDL/HDL in serum of animals were measured.RESULTS:The preventive administration of extract of Curcuma could significantly reduce the serum TC,LDL,LDL/HDL and increase serum HDL in hyperlipidemic rats in a dose-dependent manner.Its hypolipidemic action was stronger than that of positive contrast agent lovastatin.The serum levels of TC,TG,LDL and HDL not of LDL/HDL obviously decreased in hyperlipidemic rabbits after either preventive or therapeutic administration and its hypolipidemic action was weaker than that of positive con?trast agent lovastatin.CONCLUSION:Extract of Curcuma could obviouly reduce hyperlipidemic in rats and rabbits.Its action is stronger than that of lovastatin in rats,but weaker in rabbits.