Objective To explore individual exposure to solar-UV radiation of pupils in Shenyang in four seasons. Methods Personal exposure to solar-UV radiation of pupils in Shenyang in four seasons was measured with ultraviolet radiation individual monitors and at the same time UV intensity in environment was detected also. Results Results of the present paper showed that higher UV exposure dosage of the pupils had been determined in spring and autumn, lower dosage had been determined in winter and summer respectively. The accumulative UV exposure time of pupils showed lower levels in winter compared with those in spring, summer and autumn. Higher UV exposure dosage and exposure time had been determined in class day than those in break day. The annual mean of daily UV exposure dosage and exposure time presented higer levels at noon. The mean of daily exposure of pupils was less than 8 percent of environmental UV intensity. Conclusion The distribution of UV exposure of pupils in daytime is corresponded with time spent outdoors. Individual differences are mostly caused by personal behavior. Seasons may affect personal UV radiation exposure. The UV exposure received by individuals only take a little part of total environmental UV radiation.

Objective To construct the mice pneumonia model with imipenem-resistant Acinetobacter baumannii and provide experimental model in anti-pan-resistant Acinetobacter baumannii therapy study. Methods A total number of 120 4-week-old BALB/C male mice were randomly selected and divided into three groups including micro-intratracheal injection, ultrasonic atomizing and nasal dripping. The mice were treated with methotrexate to induce hypo-immunity in every group. These BALB/C mice of normal immunity and hypo-immunity were infected through Imipenem-resistant Acinetobacter baumannii by microintratracheal injection, ultrasonic atomizing and nasal dripping, respectively. The morbidity, mortality,bacterial clearance rate and histopathology in lung were determined. Results The morbidities of BALB/C mice with hypo-immunity infected by micro-intratracheal injection and ultrasonic atomizing achieved 100%(30/30), while the mortalities were 100% (10/10) and 33.3% (3/10), respectively. Mice in two groups above displayed the influx of neutrophils, lymphocytes and macrophages in the peri-bronchial and alveolar interstitial space 12-24 h after pulmonary infection. In addtion, the mice in micro-intratracheal injection group displayed coUapse of partial alveolar walls, formation of abscesses and bacterial colonies in alveoli. While the lung pathology in mice of ultrasonic atomizing group was characterized by cell degeneration in some regions in the lungs, slight relaxation, congestion in alveolar wall vessels and normal of bronchial and alveolar tissue 24 h after inoculation. Degeneration in peri-tracheal and peri-bronchial areas was observed 24-48 h after inoculation, along with highly expanded pulmonary blood vessels and edems. The inflammation was reduced at 48 hours. There was no obvious pulmonary infection in BALB/C mice with hypo-immunity by nasal dripping with mortality of 0% (0/10) and no significant histopathologic change in lungs. Conclusions BALB/C mice with hypo-immunity pneumonia model with Imipenem-resistant Acinetobacter baumannii can be conducted by micro-intratracheal injection or ultrasonic atomizing, but the latter has the advantages of high-productivity, easy-operation, low-cost, time-saving and usefulness. Mice with normal immunity are not susceptible to imipenem-resistant Acinetobacter baumannii.

Objectives To investigate the properties and distributions of ampC gene among different drug-resistant strains of Serratia marcescens,and the relationship of control gene ampR with AmpC enzymes′ expressions.Methods According to the results of inducting experiment with 1/2 MIC of beta-lactam antibiotics (CTX),three-dimensional testing and isoelectric focusing electrophoresis testing,143 strains of S.marcescens were classified into three groups:including induction group, continuous low-production group and hyperproduction group. In each group, the sequences of ampC and ampR genes were amplified using the method of PCR. The products of PCR were analyzed. The plasmid-mediated beta-lactamases were detected using the method of conjugation experiment.Results Among 143 strains of S.marcescens, the continuous low -production strains, induction strains and hyperproduction strains were 14,103,and 18, respectively.125 and 99 strains were ampC and ampR gene positive, respectively.The detection rate of ampR in hyperproduction group was lower than other groups.5 sites of ampC genes and 4 sites in the Open Reading Frame (ORF) of ampR gene were easily mutated in 5 induction strains and 2 hyperproduction strains.Conclusions The production of inducing drug-resistance of some S.marcescens might be related to mutation of ampC gene encoding AmpC beta-lactamases and the ORF mutation in ampR. The continuous hyperproduction drug-resistance had something to do with deletion mutation in ampR in segmental hyperproduction strains.The plasmid-mediated AmpC enzymes hadn′t been found in S.marcescens.

Objective To evaluate the application of fluorescence PCR in detecting ureA gene of Helicobacter pylori(HP)in feces.Methods Fluorescence PCR was used to detect ureA gene of HP in feces from 50 patients,including 23 confirmed by gastric biopsy urease test and histological staining.Bacterium culture and serum antibody detection were also performed, and chi-square test was used to compare the sensitivity,specificity,positive predictive value and negative predictive value among three methods.Results The sensitivity,specificity,positive predictive value and negative predictive value of fluorescence PCR were 1.00,0.96,96.O%and 100.0%,while those for HP culture were 0.78,1.00,100.0%and 84.0%,and thee for serum antibody detection Was 0.96,0.74,76.O%and 95.0%.There were significant differences in sensitivity and negative predictive value between PCR and bacterium culture (X2=5.60 and 4.44,P<0.05),and significant differences in specificity and positive predictive value between PCR and serum antibody detection(X2=5.28 and 4.08,P<0.05).Conclusion ureA gene detection in feces by fluorescence PCR is of value for the diagnosis of HP infection.

ObjectiveTo optimize the condition of multiple fluorescence quantitative PCR and establish a new assay of four human herpes virus (HHV) detected by AllGlo quadruple fluorescence quantitative PCR.MethodsFour HHV including HSV-1,HSV-2,EBV and CMV were identified by sequence analysing the qualitative PCR production.Furthermore,they were quantitatively detected by AllGlo and TaqMan multiple fluorescence quantitative PCR respectively.ResultsBoth the positive rate and specificity of AllGlo and TaqMan in detecting single HHV achieved 100％.And AllGlo single fluorescence quantitative PCR prevailed over TaqMan's by Ct of 1-3.Four HHV can be simultaneously detected by AllGlo quadruple fluorescence quantitative PCR,comparing to the only two by TaqMan.ConclusionAllGlo fluorescence quantitative PCR assay allows a higher throughput,sensitivity and specificity than TaqMan in detection and thus provides a board prospect.

Objective To investigate the epidemiological characteristics of mycoplasma pneumoniae (MP),Epstein-Barr virus (EB virus) and cytomegalovirus (CMV) infection in children with acute upper respiratory tract infections in Hangzhou.Methods Throat swabs and sputum samples were collected from 5942 children with acute upper respiratory tract infections in Hangzhou First People's Hospital during January 2011 and December 2012.MP,EB virus and CMV were detected using quantitative PCR.The distribution and seasonal changes of the above pathogens in children of different ages were analyzed using Chi-square tests.Results MP,EB virus and CMV were positive in 29.91％ (1777/5942),22.92％ (1362/5942) and 8.55％ (508/5942) children,respectively.Mixed infections were found in 556 (9.36％) children.The positive rates of MP varied among different age groups (x2 =113,P =0.000),and the highest one was detected in children ＞ 6-year old (448/1012,44.36％).EB virus infection was rare in age group 0-1 year,and the positive rate was of statistical difference from those in other age groups (x2 =167,181 and 187,P =0.000).The highest positive rate of CMV (23.78％) was found in children aged 0-1 year old.The positive rates of MP varied in different months of the year (x2 =208 and 211,P =0.000),and the highest positive rate was found in July and August.Conclusion The predominant pathogen of acute upper respiratory tract infection in children is MP in Hangzhou,and MP plus EB virus infection is common,particularly in older children;while CMV infection more likely occures in 0-1 year old babies,and usually in summer.

OBJECTIVE To investigate the distribution of pathogens and their antibiotic resistance in lower respiratory tract infection(LRTI) from intensive care unit(ICU) in our hospital,and provide basis for rational selection of clinical drugs.METHODS Pathogens were detected from qualified sputum specimens in LRTI from ICU and identified by VITEK-AMS60 automatic microbial analyzing system.Drug susceptibility was determined by KB test.RESULTS From 320 sputum specimens 367 pathogens were detected between from Jan 2007 to Mar 2008,including 261 strains(71.1%) of Gram-negative bacilli,70 strains(19.1%) of fungi,and 36 strains(9.8%) of Gram-positive cocci.21.8% Of the isolated pathogens were Acinetobacter baumannii,with 16.7% of drug-resistant rate to cefoperazone/sulbactam and over 71% to other 13 antibiotic agents.The rate of extended spectrum ?-lactamases(ESBLs) producing Escherichia coli isolates and Klebsiella pneumoniae ones were 65.2% and 72.0%,respectively,comparing to 84.6% for meticillin-resistant Staphylococcus aureus(MRSA).CONCLUSIONS Gram-negative bacilli are the major pathogens of LRTI in ICU,in which A.baumannii shows with a high rate of drug-resistance,followed by fungi,which should attract the clinician′s more attention.

Objective To identify a rapid and efficient fungal genomic DNA extraction method for PCR amplification.Methods Genomic DNA was extracted from Penicillum marneffei,Rhizopus microsporus,Cryptococcus neoformans and Candida albicans by heating pyrolysis,microwave,repeated freezing and thawing,lysozyme digestion,overnight snail enzymatic and Qiagen kit methods.DNA electrophoretogram was observed by gel imaging system.The concentration and purity of extracted DNA were determined with an ultramicro nucleic acid protein tester and the yields were calculated.PCR amplification and sequencing were also performed.ANOVA and SNK-q test were used for data analysis.Results There were statistical differences in concentrations and yields of the fungal DNA extracted from Penicillum marneffei (hyphal phase and yeast phase),Rhizopus microsporus,Coptococcus neoformans and Candida albicans by six methods (F=750.83,220.95,669.35,132.01,510.20 and 1658.35,287.10,963.64,1147.77,4521.22,all P ＜0.01).Of six methods,microwave method gained the highest DNA concentration and yield,followed by heating pyrolysis method,while Qiagen kit method obtained the lowest concentration and yield.All DNA extracted by 6 kinds of methods were positive in PCR amplification.Conclusion All of the six methods can be used for fungal DNA extraction which is sufficient for PCR amplification,but microwave and heating pyrolysis methods are more easy and simple to perform.

Objective To assess the diagnostic value of IMA,NLR,hs-CRP and CK-MB individually and the combined detec-tion for early acute myocardial infarction using ROC curve and Logistic regression.Methods To detect levels of IMA,NLR, hs-CRP,CK-MB and cTnI in serum or whole blood of AMI patients that had chest pain within 3 hours or between 3 and 6 hours,compared with 60 healthy people from Physical Examination Center.Applied Logistic regression,plotted ROC curve and calculated the area under ROC curve (AUC)to assess the diagnostic value of each index.Results The serum IMA,hs-CRP,CK-MB and cTnI or whole blood NLR levels of AMI patients with 3 hours were remarkably higher than normal con-trol,showing significant statistical difference (P<0.01)(AMI group:mean values of IMA,NLR,hs-CRP,CK-MB and cTnI were 96.04 U/L,3.77,13.39 mg/L,43.26 U/L and 0.063 ng/ml;normal control group:mean values of IMA,NLR,hs-CRP,CK-MB and cTnI were 78.10 U/L,2.02,3.12 mg/L,19.37 U/L and 0.040 ng/ml.The serum IMA,NLR,hs-CRP, CK-MB and cTnI levels of AMI patients in the group between 3~6 hours were higher than in the group within 3 hours (P<0.05).The AUC of combined detection of IMA,NLR,hs-CRP and CK-MB for early AMI was 0.98,higher than solo de-tection of IMA,NLR,hs-CRP and CK-MB,which were 0.89,0.83,0.79 and 0.85 respectively.Meanwhile,the AUC of com-bined detection for four markers also surpassed that of cTnI alone that was recognized as a classic serological marker to diag-nose AMI (AUC=0.78).Conclusion The combined detection of IMA,NLR,hs-CRP and CK-MB is superior to a single in-dex detection,which can significantly improve diagnostic efficiency for early AMI.

Objective To assess circulating miRNAs’diagnosis value of breast cancer.Methods Conducted PubMed,Embase, the Cochrane Library,CNKI,cqvip,and wangfang database search in any language before June 2014.A total of 12 publica-tions were included in the meta-analysis.Then,the meta-analysis was performed using Meta-Disc 1.4.Meanwhile,the diag-nostic sensitivity,specitivity,positive likelyhood ratio,negative likelyhood ratio and diagnostic odds ratio were pooled by ran-dom-effects models.And the overall diagnostic performance was estimated by summary receiver operating characteristic curves (sROC)approaches.Stata12.0 was used to evaluated the publication bias.Results The pooled sensitivity was 80%(95%CI 0.77~0.82),specificity was 78% (95%CI 0.75~0.81);positive likelihood ratio was 4.09 (95%CI 2.80~5.99), negative likelihood ratio was 0.22 (95%CI 0.15~0.31),diagnostic odds rations was 20.64 (95%CI 10.24~41.62).The AUC for circulating miRNAs was 0.89 with Q value of 0.82.Publication bias was observed in existing literatures.Conclu-sion Circulating miRNAs is a potential biomarker in the diagnosis of breast cancer.