The respiratory syncytial virus (RSV) is one of the most common causes of acute infection of the lower respiratory tract among children. For viruses in the Paramyxoviridae subfamily, membrane fusion requires a specific interaction between two glycoproteins: the fusion protein and attachment protein. Membrane fusion of the RSV appears to be unique among paramyxoviruses in that fusion is accomplished by the fusion protein alone without help from the attachment protein. Here, we review recent achievements and advances in the study of membrane fusion triggered by the RSV published in high-impact-factor journals. We also review and make a comparative analysis of the popular hypotheses regarding membrane fusion of the RSV. Finally, we discuss the "hot topics" in current research and controversial data published in recent years in the hope of providing references for Chinese researchers.
Animals ; Humans ; Respiratory Syncytial Virus Infections ; virology ; Respiratory Syncytial Viruses ; genetics ; physiology ; Viral Fusion Proteins ; genetics ; metabolism ; Virus Internalization

Objective To comparison of the safety of two treatment methods of cesarean scar pregnancy (CSP) of typeⅡ and Ⅲ in menopause within 7 weeks. Methods Totally 70 cases of CSP of typeⅡ and Ⅲ within 7 weeks of the last menstrual period, hospitalized within Peking University First Hospital from January 2009 to May 2016, had been retrospectively studied in two groups of different treatments. The methotrexate (MTX) treatment group included 37 cases receiving ultrasound-guided complete curettage of uterine cavity combined with MTX therapy, while the uterine artery embolization (UAE) group had 33 cases treated with UAE combined with MTX therapy and subsequent ultrasound-guided complete curettage of uterine cavity. The bleeding measurements during operation had been documented and compared for the study. Results The comparative difference of bleeding measurements between the MTX treatment group and the UAE group was insignificant from the statistical perspective (median: 5.0 vs 5.0 ml, P=0.716).The comparative difference of the duration (median: 2.0 vs 6.0 days, P<0.01) and expenses (median: 2832.1 vs 10147.1 yuan, P<0.01) for hospitalization between the MTX treatment group and the UAE group were significant from the statistical perspective. Conclusions The bleeding risks may not increase during the treatment of ultrasound-guided complete curettage of uterine cavity combined with MTX therapy for CSP patients of type Ⅱ and Ⅲwithin 7 weeks of the last menstrual period. Meanwhile, the UAE adverse effects and complications will be avoided, and the duration and expenses for hospitalization will be reduced.

Objective To study the effect of glucosides of cbaenomeles speciosa (GCS) on the expression of EP2 and EP4 in synovial tissues from rats with adjuvant arthritis. Methods Complete Freund's adjuvant (FCA) was used to induce adjuvant arthritis (AA) in rats. The synoviocytes from AA rats were collected and incubated. Synoviocytes proliferation was determined by 3-(4,5-dimethylthiazal-2yl) 2,5-dipbeny+hetrazoliumbromide (MTT) assay. Levels of prostaglandins E2(PGE2) and cAMP were determined by radioim-munoassay (RIA). The expression of EP2 and EP4 was detected by Western blot analysis. Results GCS significantly inhibited the proliferation of synoviocytes. GCS decreased the level of PGE2 and increased the level of cAMP. The results of correlation analysis demonstrated that GCS inhibited synoviocytes hyperplasia by increasing the level of cAMP in synoviocytes. The results of Western blot analysis demonstrated that GCS significantly improved the expression of EP2 and EP4. Condusion These results suggest that restoring normal transduction of the EP-G protein-cAMP signal pathway may be one of the most important mechanisms of GCS.

Objective To evaluate the effects of different doses of dexmedetomidine on the anterograde amnesia of propofol in the patients undergoing gynecological surgery.Methods Sixty patients,aged 20-50 yr,with body mass index of 18-25 kg/m2,of ASA physical status Ⅰ or Ⅱ,scheduled for elective laparoscopic total hysterectomy,were randomly divided into 3 groups (n =20 each) using a random number table:propofol group (group C),low-dose dexmedetomidine combined with propofol group (group D1) and high-dose dexmedetomidine combined with propofol group (group D2).Dexmedetomidine 0.2 and 0.4 mg/kg were infused intravenously over 15 min in D1 and D2 groups,respectively.Target-controlled infusion of propofol was then started at an initial target plasma concentration (Cp) of 0.5 μg/ml.The Cp increased to 0.9,1.3,1.7 and 2.1 μg/ml in turn and maintained at each level for 3 min.After entering the operating room (baseline),at the end of dexmedetomidine infusion,and when Cp was maintained at each level for 3 min after being increased to 0.9,1.3,1.7 and 2.μg/ml in turn,and amnestic test and OAA/S score were performed.The Cp of propofol and BIS value were calculated when the amnestic rate reached 95 ％.The development of hypotension,bradycardia,respiratory depression,and upper airway obstruction was also recorded.Results Compared with group C,the amnestic rate was increased,the Cp of propofol and incidence of respiratory depression were decreased when the amnestic rate reached 95％,BIS value was increased (P ＜ 0.05),and no significant change was found in the incidence of the other adverse events in D1 and D2 groups (P ＞ 0.05).Compared with group D1,the amnesia rate was increased,the Cp of propofol was decreased and the BIS value was increased when the amnestic rate reached 95 ％ in group D2 (P ＜ 0.05),and no significant change was found in the incidence of the other adverse events in D1 and D2 groups (P ＞ 0.05).Conclusion The optimum dose of dexmedetomidine enhancing the anterograde amnesia of propofol is 0.4 μg/kg in the patients undergoing gynecological surgery.

Objective:To study the efficacy comparison between the antibacterial catheter and common central venous catheter in ICU patients.Methods: The 110 ICU patients with central venous catheter were randomized into the control group (common central venous catheter)and the observation group (antibacterial catheter), 55 patients per group. The success rate of catheter, the averange catheter days, complications, and the incidence of catheter-related infection (CRI)and pathogen distribution in the two groups were observed and compared.Results: Compared with the control group, the success rate of catheter was significantly increased(100.0% vs 81.8%,x2=11.00,P<0.05), the averange catheter days were obviously reduced(12.5±3.0 vs 13.5±3.0,t=3.49,P<0.05)days, the incidences of complications (red and swelling in puncture site(3.6% vs 27.3%,x2=11.76,P<0.05), fluid in puncutre site (3.6% vs 21.8%,x2=8.18,P<0.05), catheter herniation(1.8% vs 20.0%,x2=9.35,P<0.05)were significantly decreased in the observation group with statistical difference (P<0.05). Conclusion: The antibacterial catheter can significantly reduce the incidence of CRI for ICU patients and improve the security of central venous catheter.

OBJECTIVE:To determinate the dissolution of Compound Flavone capsules by HPLC.METHODS:Nova-Pak C18(250mm? 4.0mm,5? m) column was used with column at room temperature.The mobile phase consisted of methanol-0.4% H3PO4(50:50) at a flow rate of 1.0mL? min-1.The detective wavelength was 360nm.The dissolution of the Compound Flavone capsules was determined by basket stirring technique with 0.1mol? L-1 hydrochloric acid as dissolvent at a speed of 100r? min-1.RESULTS:The cumulative dissolution rate of Compound Flavone capsules was above 80% at 30 minutes.The linear range of Quercetin was 0.065 84～ 0.658 4?g(r=0.999 9).The average recovery was 99.35%,RSD=0.92%(n=6).CONCLUSION:The method is simple,accurate and reproducible,and suitable for the guality control of Compound Flavone capsules.

Objective To explore perioperative control level of plasma glucose in patients with diabetes mellitus. Methods A total of 163 patients with diabetes were divided into two groups, Group A with fasting plasma glucose (FPG)≤6.9 mmol/L, and Group B with FPG≥7.0 mmol/L. FPG, plasma glucose two hours after glucose load (2hPG), urine ketone, hypoglycemia, days to use antibiotics, and days of operation wound healed were observed. Results FPG level [(5.9?0.7) mmol/L] before surgical operation and plasma glucose level [(7.5?1.7) mmol/L]during operation in Group A were lower than those in Group B [(8.1?2.1) mmol/ L and(13.4?3.7) mmol/L], with P

Objective To find out the optimum extraction process for Weiweining pill. Methods The extraction process was studied by uniform design with the yield of extracted Paeoniflorin, n-butanol extract and ethyl acetate extract as markers. Results The optimum extraction process was adding 16 times amont of 60% alcohol, refluxing and extracting for 2 times, 65 min for each time. Conclusion This extraction process shows good stability and is available for the production of Weiweining pill.

Objective:To investigate the correlation between the component contents and near-infrared spectral characteristics of sophora pieces from different habitats to confirm the near-infrared spectral features of sophora pieces. Methods: The near-infrared spectroscopy of the sophora extract was determined to confirm the characteristic absorption of principal components. Meanwhile, the content of main ingredients in sophora pieces was measured by HPLC, and the near-infrared spectral characteristics of sophora pieces from different places were compared analyzed. Results: The near-infrared spectral features of sophora pieces from different habitats showed some differences with something in common. There was a close relationship between the near-infrared spectral features and the compositions and the main ingredients. Conclusion:Combining with the near-infrared spectra of sophora extract can effectively identify the characteristics of sophora pieces from different places, which is beneficial to the establishment of a reasonable and effective near-in-frared qualitative analysis model.