MicroRNAs (miRNAs) are a class of small,non-coding,single-stand RNA molecules which are composed of 21-25 ribonucleotides.They regulate gene expression at post-transcription and participate in many important biological processes including cell growth,apoptosis,viral infection and cancer development.At present,the studies on miRNAs in cervical lesion include miRNAs expression characteristic of cervical cancer and precancerous lesion,the association with HPV infection and prognosis of cervical lesion,cervical cancer development,diagnosis and therapy.

Tooth extraction is a common operation in oral surgery. Traditional-extraction instruments, such as bone chisel, elevator, and bone hammer, lead to not only severe trauma but also unnecessary complications, and patients easily become nervous and apprehensive if tooth extraction is performed using these violent instruments. In recent years, with the develop- ment of minimally invasive concept and technology, various micro-power instruments have been used for tooth extraction. This innovative technology can reduce the iatrogenic trauma and complications of tooth extraction. Additionally, this technology can greatly decrease the patient's physical and mental pressure. The new equipment compensates for the deficiency of traditional tooth extraction equipment and facilitates the gradual replacement of the latter. Diverse micro-power systems have distinct strengths and weaknesses, so some auxiliary instruments are still needed during tooth extraction. This paper focuses on the various micro-power systems for tooth extraction and tries to compare the advantages and disadvantages of these systems. Selection and usage of auxiliary equipment are also introduced. Thus, this paper provides reference for the proper application of the micro-power systems in tooth extraction.
Humans ; Tooth Extraction ; instrumentation

Objective To investigate the prevalence of nonalcoholic fatty liver disease in a population of routine check-up,and analyze the correlation between non-alcoholic fatty liver disease and metabolic risk factors.Methods Physical examination data of 2 064 routine check-up (aged 45 or more) in the Third People's Hospital of Chengdu from January 2014 to December 2015 were randomly selected.HbA1c,fasting blood glucose,blood lipids and other indicators were measured to calculate the prevalence of NAFLD,and to analyze the correlation between NAFLD and metabolic risk factors.Results Among 2 064 cases underwent physical examination,the overall prevalence of NAFLD was 16.09％ (332/2 064).The male prevalence rate of NAFLD was significantly higher than that in female (18.51％ vs.12.87％;x2 =11.913,P =0.001).In four age groups (＜ 50 years old,50 to 59 years old,60 to 69 years old,≥ 70 years old),the NAFLD prevalence rate was 16.26％,15.63％,16.97％ and 14.72％ respectively.No statistical significance (x2 =0.900,P =0.826) was found in NAFLD prevalence rate difference in all age groups of has.In 50 ～ 59 years old and ≥70 years old group,the NAFLD prevalence rates in male were higher than that in female,the difference was statistically significant (both P ＜ 0.05).BMI,waist circumference,systolic blood pressure,diastolic blood pressure (DBP),HbA1c,fasting blood glucose,TC,TG,LDL-C,uric acid levels in NAFLD patients were higher than the normal population.HDL-C levels in patients with NAFLD is lower than that of the normal,and the difference is statistically significant (both P ＜ 0.05).Logistic regression analysis showed that BMI,hypertension,diabetes,and high TG were the independent risk factors of NAFLD;HDL-C and NAFLD were the protective factors.Conclusions In the Chengdu area of Sichuan Province,the prevalence rate of NAFLD was high,the incidence rate of NAFLD in male was higher than that in female.BMI,hypertension,diabetes mellitus and high TG were the independent risk factors of NAFLD,and HDL-C was the protective factor.

AIM: To study changes of medium chain acyl- Co A dehydrogenase (MCAD), muscle carnitine palmitoyltransferase I (M-CPT-I) and co lligin mRNA/protein expression, to elucidate molecular mechanism of the recapit ulation of fetal energy metabolism and ventricular remodeling and the effects o f carvedilol during the development of pressure overload-induced left ventricula r hypertrophy in rats. METHODS: Male Wistar rats of hypertrophy induced by constrictio n of abdominal aorta (CAA) were randomized into 2 groups (n=12, each group): 4-week group (CAA 4 weeks group) and 12-week carvedilol intervention gro up (CAR group). Additi onal rats (n=12) underwent abdominal cavity incision without ligation to ser ve as age-matched sham operated controls (SH). Hemodynamics, ventricular remodel ing parameters and free fatty acid (FFA) both in blood serum and myocardium we re measured. RT-PCR analysis of the expression of mRNA of M-CPT-I, MCAD and col lagen binding protein (colligin) were investigated. The protein expression of co lligin was analyzed by Western blotting in the experimental animals and sham op eration.RESULTS: LVM/BW and MAP in CAA group were increased more signif icantly than in sham group. There were progressive increases in FAA both in bloo d serum and myocardium in CAA group than in sham group, accompanied with downreg ulation of gene expressions of M-CPT-I and MCAD and colligin mRNA/ protein upre gulation in LV in CAA group, while changes of all of these parameters in CAR gro up were attenuated. CONCLUSIONS: (1) The down-regulated expression of cardiac FAO en zyme genes (M-CPT-I and MCAD) in the hypertrophied heart may be responsible for "the recapitulation of fetal energy metabolism" during the development of pres sure overload-induced left ventricular hypertrophy in rats. (2) Carvedilol atten uates the reversion of the metabolic gene expression back towards fetal type. (3 ) Carvedilol is effective in regressing the left ventricular remodeling by inhi biting colligin protein expression. A molecular mechanism by which carvedilol ma y confer cardioprotective effects in heart failure may be, in part, via preservi ng o f the adult metabolic gene regulation and regressing left ventricular remodeling .

BACKGROUND: The incidence of cognition disturbance after cerebral infarction is about 20% -30% and effective drugs for its prevention and treatment are anticipated.OBJECTIVE: To investigate the effect of nicergoline on cognition disturbance after cerebral infarction and explore its mechanism.DESIGN: Randomized controlled trial based on patients.SETTING: Neurological department in a medical university.PARTICIPANTS: A total of 60 patients admitted to the Neurological Department of the Second Hospital Affiliated to Chongqing Medical University for cerebral infarction during October 1999 and April 2001 were recruited in this study, and randomly divided into two groups, nicergoline treatment group and control group with 30 in each.METHODS: Mini-mental state examination(MMSE) score was evaluated and cerebral blood flow was determined with transcranial Doppler' s ultrasonography within one week after admission and three months after admission, respectively, and data were analyzed with SPSS software.MAIN OUTCOME MEASURES: MMSE score and velocity of blood flow in treatment and control groups.RESULTS: MMSE score in memory, calculation and recollection decreased significantly[ (1.2 ± 1.3), (2. 2 ± 2. 1) and(1.0 ± 1.7), respectively] in control group but did not change much[ (3.9 ± 1.4), (4. 4 ± 1.9) and(4.0 ± 1.6) ]in treatment group. The velocity of blood flow in control group decreased apparently, while it increased in treatment group[(58.31 ±10. 15) and(65.79 ±9.74) cm/s in the right middle cerebral artery].CONCLUSION: Nicergoline can prevent and treat vascular cognition disturbance, and improvement of blood supply may be one of the mechanisms.

Some basic knowledge of the outbreak and direction of earthquake, and shows that in some areas the medical resources are wasted severely are briefly introduced. A long-term mechanism and emergency draft be set up for antiearthquake and rescue is suggested, which should aim at different areas and districts manage in large scale and reasonably distribute the limited medical resources. In this way, the indemnification can be raised, the victims' life and property can be saved, and the disaster areas can obtain better service.

OBJECTIVE To improve efficiency of hospital infection administration and take strict precautions against medical malpractice in Chinese level Ⅱ hospital of UN Peacekeeping Army in Lebanon.METHODS The current situations of its hospital infection administration were enumerated,compared and analyzed,and corresponding measures of administration were suggested.RESULTS Under the influence of characters of medical missions during peacekeeping,the hospital infection administration presented the problems that patients and disease spectra were diversified,the rate of hospital infection was influenced by peacekeeping mission,the positive rate of HIV was high,medical workers protection awareness was lagged behind,and the disposition of hospital was illegitimate;many measures should be taken to enhance the administration level.CONCLUSIONS In order to well develop the hospital infection administration in Chinese level Ⅱ hospital of UN Peacekeeping Army in Lebanon,we should reform and improve the system of hospital infection administration,and establish an effective and systematic prevention system of hospital infection.

Objective To investigate the influence of surface grafting density of polyethylene glycol (PEG) molecules on the interactions of nanoparticle with the biomembrane.Methods The dynamics of polymer as well as its shielding effect on the wrap of the membrane were investigated using coarse-grained (CG) molecular dynamics simulations.A coarse grained model force field,MARTINI,was employed for its ability to reproduce experimental properties of various lipid dynamics and some kinds of polymer as well.Results As a result,structural variations and energy changes of grafted PEG molecules on the nanoparticles,adsorbing dynamics of PEGs on the membrane as well as the wrap rates of the membrane were obtained to shed light on the PEGylation-mediated shielding mechanism in the adsorption of PEGylated nanoparticles on the membrane.Conclusions The surface grafting density of PEGylated nanoparicles has been found to play a crucial role in the stealth shielding behavior of PEGylated nanocarriers.These studies are consistent with experimental observations and to some extent give a molecular level interpretation of the macroscale observations of prolonged circulation half-life of stealth nanocarriers.

Objective To explore the role of halofuginone in immune regulation,observe the effects of halofuginone on maturation of dendritic cells and immune tolerance during homograft heart transplantation of rats,in order to provide new ways and means to treat transplantation tolerance and to explore its possible mechanism.Methods Rat bone marrow derived dendritic cells were isolated and the effects of halofuginone in LPS-treated DCs were investigated by flow cytometry;heart transplantation model of rats were established and the effect of halofuginone stimulated dendritic cells in the immune tolerance by pathological analysis and mixed lymphocyte reaction were observed.Results Flow cytometry results show that the expression of cell surface CD80 CD86,OX62 antigens were not high in control group,their expression increased significantly when stimulated by LPS for 24h,and decreased when stimulated by both Changshan ketone and LPS for 24h,and even lower than their expression levels in blank group,which showed that Changshan ketone has the ability to inhibit the maturation of dendritic cells induced by LPS.In rat heart transplantation model,dendritic cells stimulated with Changshan were injected into recipient rats in vivo,and receptor of rat transplantation rejection decreased significantly,which showed that dendritic cells stimulated with Changshan ketone may be used as a new method for cell therapy in treatment of transplant rejection.Conclusion This study systematically observes that halofuginone can inhibit the maturation of rat bone marrow-derived dendritic cells and lymphocyte proliferation for the first time in vivo and in vitro.