Integration is a critical step in the retroviral life cycle.HIV-1 integrase is involved in the integration of HIV DNA into host chromosomal DNA and appears to have no functionally equivalent in human cells.It has become an attractive and rational target for selective anti-AIDS therapy.A random linear heptapeptides phage display library was panned on the recombinant HIV-1 integrase protein.After five rounds of panning,13 positive phage clones were selected and sequenced.Two consensus peptides(TPSHSSR and HPERATL) were chemically synthesized.The non-radioactive ELISA-based HIV-1 integrase assay showed that the synthetic peptides TPSHSSR and HPERATL were able to inhibit the 3'cleavage or strand transfer activity of HIV-1 integrase to some extent(IC50=(54.56?5.18) ?mol/L,IC50=(28.29?1.32) ?mol/L,respectively) .These heptapeptides could be used for developing new anti-HIV drug candidates,as well as for structural studies of the three-dimensional structure of the entire integrase molecule.

The effects of DK2, a peroxisome proliferator-activated receptor γ agonist, on cultured human pterygium fibroblasts (HPFs) in virto were studied. The HPFs were incubated with 0-200 μmol/L DK2 for 12-72 h. The MTT method was used to assay the bio-activity of DK2 at different doses and time. The cytotoxic effect of DK2 was measured by LDH release assay. The cell cycle distribution and apoptosis were flow cytometrically detected. The expression of proliferating cell nuclear antigen (PCNA) in each group was detected by real-time PCR (RT-PCR) and Western blotting. The results showed that administration of 1-75 μmol/L DK2 for 12-72 h could significantly inhibit HPF proliferation in a dose- and time-dependent manner. DK2-treated cells did not release significant amount of LDH as compared with rosiglitazone-treated cells. After treatment with DK2 at concentrations of 15, 25 μmol/L for 24 h, the number of HPFs in G(0)/G(1) phase was significantly increased while that in S phase was significantly decreased (P<0.05), leading to arrest at G(0)/G(1) phase. The apoptosis rates of HPF cells in drug-treated groups were significantly higher than the rate of control group (P<0.05). At the dosage range between 15-25 μmol/L, DK2 could inhibit the expression of PCNA mRNA and protein in HPFs in a dose-dependent fashion (P<0.05). It was concluded that PPARγ agonist can significantly inhibit HPF proliferation, resulting in the arrest at G(0)/G(1) phase, induce the apoptosis of HPFs, and suppress the synthesis of PCNA, in dose- and time-dependent manners.

The application of standardized patient SP is the tendency of clinical medical education in China.Normative and effective SP training is the basis of good teaching quality of medical education.By introducing the experience about how to choose and train tandardized Pa-tients in medical teaching the author discusses its significances for the clinical education,with a view to further deepening SP follow—up to the teaching of medical and other clinical disciplines as well as providing a reference.

Abstract: Objective　To analyze the vaccination status of SARS-CoV-2 in children, and explore the relationship between SARS-CoV-2 vaccination and COVID-19 in children. Methods　A retrospective study was conducted to analyze the clinical data of 335 cases of SARS-CoV-2 Omicron variant infection from February 15, 2022 to March 18, 2022 in Shenzhen Third People's Hospital. Results　Among 335 children with SARS-CoV-2 infection, 174(51.9%) cases were vaccinated with the SARS-CoV-2 vaccine; 33(31.4%) cases were vaccinated in the 3-<6 years old group; 141(61.3%) cases were vaccinated in the 6-<14 years old group. There was a statistically significant difference in the proportion of SARS-CoV-2 vaccination between the 6-<14 years old group and the 3-<6 years old group (χ2=26.1, P<0.05). In the study cohort, 3-<6 years old group and 6-<14 years old group, there was no significant difference in the incidence of COVID-19 in the vaccinated group compared with the unvaccinated group (P>0.05). In the study cohort, the proportion of confirmed cases of 1 dose of SARS-CoV-2 vaccine and 2 doses or more of SARS-CoV-2 vaccine was 89.5% (68 cases) and 77.6% (76 cases), respectively; in the 6~<14 years old group, the proportion of confirmed cases of 1 dose of SARS-CoV-2 vaccine and 2 doses or more of SARS-CoV-2 vaccine was 90.0% (54 cases) and 76.5% (62 cases), respectively; the differences were statistically significant (χ2=4.264, P<0.05; χ2=4.279，P<0.05). The IgG levels of 18.28 (6.61, 55.2) AU/mL and 58.3 (25.85, 131.41) AU/mL in the study cohort who were vaccinated for 1 dose, 2 doses and more, respectively; the IgG levels of 20.13 (8.33, 44.33) AU/mL and 56.57 (25.85, 150.07) AU/mL in the 6~<14 years old group who were vaccinated for 1 dose, 2 doses and more, respectively; and the differences were statistically significant (Z=-4.37, P<0.05; Z=-3.96, P<0.05). Conclusions　Children who received 2 doses of SARS-CoV-2 vaccine have a lower incidence of COVID-19 and higher levels of SARS-CoV-2 antibodies compared with who received 1 dose . It is recommended that children are advised to be vaccinated against the COVID-19.

Objective: The similarities and the differences among Peru's Ginseng healthcare product, Radix Ginseng and Panax quinquefolium were studied. Methods: The work was performed by analysis of HPLC FPS and 4 dimensional UV FPS. Results: Their 4 dimensional UV FPS were very similar with each other, and the common peaks ratio of the components extracted from Peru's Ginseng healthcare product, Radix Ginseng with absolute alcohol was larger than that of the components extracted from Peru's Ginseng healthcare product and Panax quinquefolium. The variant ratio between the healthcare product and Radix Ginseng were more similar and much lower than that between the healthcare product and Panax quinquefolium. Conclusion: The components extracted from the healthcare product with absolute alcohol are the same as that from Radix Ginseng and are of quite large difference from the components from Panax quinquefolium.

Objective: To comprehensively compare the qualities of Codonopsis Radix from the different planting areas for regionalizing the planting areas. Methods: The main traits and chemical compositions of 38 samples of Codonopsis Radix from the different planting areas in Jiuzhaigou County were comprehensively compared by SPSS 17.0 software using principal component and cluster analysis. Results: Five principal components whose accumulated variance contribution rate was over 85.604% were obtained. Based on these principal components, 38 samples of Codonopsis Radix from the different planting areas in Jiuzhaigou County were clustered into four groups by within-groups linkage cluster methods. Conclusion: Principal component and cluster analysis are reliable to comprehensively evaluate the quality of Codonopsis Radix. Significant differences among these samples from the different planting areas in Jiuzhaigou County are obvious. The standardization of cultivation techniques and application should be speeded up.

Background Recurrence of pterygium is a common complication after the surgical excision of pterygium,and this procedure is related to cell proliferation,inflammation and neovascularization.Researches determined that rosiglitazone can suppress inflammation and neovaseularization and inhibit proliferation,hut few studies concerning the effect of rosiglitazone on pterygium were performed. Objective The aim of this study was to investigate the effect of peroxisome proliferator-activated receptor γ agonist on the proliferation and apoptosis of human pterygium fibroblasts(HPFs)in culture and search for a new drug to prevent and cure the recurrence after pterygium surgery. Methods Human pterygium samples were obtained during surgery and HPFs were cultured and purified using an explant method and 0.25%trypsin digestion,respectively.The identity of cultured HPFs was confirmed by immunohistochemistry using anti-vimentin and keratin antibodies.Rosiglitazone with the concentrations of 0(control),5,10,25,50,75,100,150,200,400μmol/L was then added in the culture medium for 12,24 or 72 hours.1%DMSO was used as blank control.The MTT method was used to assay the biologic effects of rosiglitazone on HPFs.Cell cycle distribution and apoptosis of HPFs after rosiglitazone treatment were studied by flow cytometic analysis.The expression of proliferating cell nuclear antigen(PCNA)mRNA in HPFs was detected by real-time PCR. Result Cultured HPFs radially migrated outward from the pterygium block,and then grew in long fusiform shape,showing positive response for vimentin and negative for keratin.The HPFs became round and thin with loose distribution after the addition of rosiglitazone.Following 25-125 μmol/L rosiglitazone administration for 12,48 or 72 hours,the A490 value of HPFs significantly declined with the increase of dosage(F=158.312,P=0.006)and lapse of time(F=1.924,P=0.135).Following the treatment of 25,75 or 125 μmol/L rosiglitazone for 24 hours,the number of HPFs in G0/G1 phase was markedly elevated;while the cell numbers in S phase decreased significantly in comparison with the control group(P＜0.05).The apoptotic rate of HPFs in the 25,75 and 125 μmol/L rosiglitazone groups significantly increased with the increase of rosiglitazone concentration(P＜0.05).Real-time PCR revealed that after 24 hours of rosiglitazone treatment,the expression of PCNA mRNA in HPFs was suppressed in a dose-dependent manner(F=3244.329,P＜0.05). Conclusion Rosiglitazone inhibits HPFs proliferation,arrests their cell cycle progression in G0/G1 phase,induces apoptosis of HPFs and depresses the synthesis of PCNA in a dose-and time-dependent manner.

Objective To evaluate the payment effect of hospitalization expense under the urban employee basic medical insurance in Guangzhou.Methods Analyze the differences between the expenses paid by medical insurance with actual hospitalization expenses of the 22 settlement units from 1 5 tertiary hospitals,and the expense settlement data of the insured patients,based on the early,the mid-term,and the recent periods since the urban employee basic medical insurance was implemented since 2002.Results The ratio of good payment effect units reduced to 9.09%(the recent)from 42.86%(the earlier).The ratio of poor payment effect units was 42.86% in the early,to mid-term 18.18%,and sharply increased to 77.27%in the near term.The settlement units which exceeded its flat standard accounted for 52%,50%, and 91%respectively(in the early,the mid-term,and the recent).The medical insurance agency and the hospital shared the overrun costs by 52.88%and 47.12%respectively in 201 1.Conclusion The payment effect of the urban employee medical insurance was greatly influenced by the adjustment of medical insurance policy and the payment ability of the pooling fund.It should improve the payment effect of the medical insurance timely,so as to ensure the hospitals’operation normally.The hospitals should take the effective cost management measures so as to deal with the increasing cost control pressure.

Objective To develop a rapid and sensitive method for the determination of bisphenol A in drinking water by liquid chromatography-electrospray tandem mass spectrometry. Methods Bisphenol A was extracted from the drinking water sample by a SEP-PAK C18 column,eluted with methanol and concentrated with a rotary evaporator. The extract was analyzed by liquid chromatography-tandem mass spectrometry with electrospray ionization. Results The calibration curve of bisphenol A was linear in the range of 5 -100 ng/ml,the linear equation was y =6 796.61x -8 655.64 and the correlation coefficients of linear calibration curve was 0.999 2. The limit of detection (S/N=3) and the limit of quantification (S/N=10) of bisphenol A were 0.007 5 ng/ml and 0.025 ng/ml,respectively. The rates of recovery of bisphenol A were from 83.46% to 94.00% and the relative standard deviation was 3.06% -4.60%. Conclusion The method is simple,rapid,accurate and is applicable to the qualitative and quantitative determination of bisphenol A in drinking water.

This study is to investigate the effect of low doses of insulin (1 u x kg(-1)) and selenium (180 microg x kg(-1)) in combination on general physiological parameters and insulin signal molecules in cardiac muscle of STZ-induced diabetic rats. The levels of blood glucose were estimated using One Touch SureStep Blood Glucose meter. HbA1c levels were estimated using microcolumn assay. TG and TC were estimated using enzymatic assay. The levels of PI3K and GLUT4 in cardiac muscle were examined by immunoblotting and immunohistochemistry. The result showed that insulin in combination with selenium could significantly lower blood glucose and blood lipid levels and markedly restored the PI3K and GLUT4 levels in cardiac muscle. It could be concluded that there was cooperation between insulin and selenium, and that treatment of diabetic rats with combined doses of insulin and selenium increased cardiac glucose uptake by upregulating the level of PI3K-mediated GLUT4 in cardiac muscle, eventually ameliorating myocardial dysfunction.