Background and purpose: Colorectal cancer (CRC) is the most frequently occurring primary malignant tumor. Chemotherapy can reduce the risk of local and distant relapse. Therefore, it is very important to ifnd new biomarkers that can predict chemoresistant and help in treatment decisions. Methods:In this study, we examined the expression levels of 1 200 human miRNAs in 6 CRC tissues, using miRNA proifling assay arrays. A validation study was done to corroborate a subset of the results, including expression levels of miR-4299, miR-196b, miR-324-5p, miR-455-3p and miR-939, by analyzing 100 specimens of stageⅣcolorectal adenocarcinoma (not respond and respond to the chemotherapy) to quantitative real-time PCR. We modeled the relationship between the expression levels of these miRNAs and the survival rate of 100 CRC patients by Kaplan-Meier method. Results:Expression proifles in CRCs suggested that 5 miRNAs were candidate markers associated with the chemoresistance of colorectal cancer. We found that miR-4299 and-196b had signiifcant diagnostic value for chemoresistance CRC. miR-4299 yielded an AUC (the areas under the ROC curve) of 0.784 and miR-196b yielded an AUC of 0.647 in discriminating CRC from controls. Combined ROC analysis using these 2 miRNAs revealed an elevated AUC of 0.848 with 67.9%sensitivity and 90.9%speciifcity in discriminating chemoresistance CRC. The low level of miR-4299 expression and the high level of-196b expression are signiifcantly correlated with the good survival of CRC patients. Conclusion:These data suggest that miR-4299 and-196b have strong potential as novel biomarkers for chemoresistant detection of colorectal cancer.

Objectives To study the correlation between social emotion and temperament in infants and toddlers. Me-thods The Brief Infant-Toddler Social and Emotional Assessment (BITSEA) and Toddler Temperament Questionnaire (TTQ) were used to evaluate the social emotional problems and temperament of 657 infants and toddlers 1 to 3 years old. Results The temperament dimensions were correlated with behavior and competence factors. The infants and toddlers in dififcult type group had more behavior problems or deifcits/delays in competence than those in easy type group (χ2=26.49, 10.48, P<0.01). Conclu-sions Infants and toddlers with negative temperament traits have more behavior problems and weaker social emotional compe-tences. The temperament should be considered in dealing with emotional problems.

Objective To explore the optimum exposure factors in digital chest radiography.Methods Chest phantom was exposed under auto exposure control model with 73, 90, 125kV and S200,400,800 plus or minor 4 micro-adjust for each sensitivity grade. Meanwhile dose area product (DAP) was recorded and the value of IQFinv was analyzed automatically by Artinis CDRAD Analyzer 1.1. Ten volunteers were exposed with 73 kV, S800 - 2; 90 kV, S800 + 2 and 125 kV, S400 + 2. Two radiologists evaluated and scored image quality. Statistical analysis was performed using one way ANOVA test by SPSS 12. 0. Results ( 1 ) The quality scores of volunteers' images obtained with three combinations of exposure factors were 2. 7 ± 0. 5 for 73 kV group, 2. 9 ± 0. 3 for 90 kV group and 2. 8 ± 0. 4 for 125 kV group. The difference among them was not statistically significant ( F = 0. 587, P ＞ 0. 05 ). Whereas the DAP values were (29. 1 ± 7.9) mGy · cm2 for 73 kV group, ( 30. 5 ± 4. 5 ) mGy ·cm2 for 90 kV group and (40. 4 ±7.6) mGy · cm2 for 125 kV group, with statistically significant difference among them ( F = 9. 803, P ＜0. 01 ). (2) In all three kV conditions, DAP value of phantom declined when sensitivity increased. There was a difference of DAP value by 11％ between two successive sensitivity grades. Under the condition of same sensitivity, DAP value changed with kV in the following order: 73 kV ＞90 kV ＞ 125 kV. (3) The value of IQFinv decreased when sensitivity increased. Under the condition of same sensitivity, IQFinv changed with kV as follow: 73 kV ＞90 kV ＞ 125 kV. Conclusion The combination of exposure factors of 90 kV and S800 + 2-S800 +4 is optimum for digital chest radiography.

Aim To observe the neuroprotective effect of different doses of propofol on ischemic fetal rat brain.Methods Eighteen healthy pregnant SD rats were randomly allocated into the following six groups with three rats in each.Group S: sham operation group, Group IR: ischemia/reperfusion group, Group P1~P3: different doses of propofol groups, Group B: bicuculline group.In group S and group IR, 1 ml saline solution was administered via caudal vein.In group P1~P3, 10, 30, 50 mg·kg-1 of propofol was administered via caudal vein respectively.In group B, when 50 mg·kg-1 propfol was administered via caudal vein, 5 mg·kg-1 bicuculline was injected intraperitoneally at the same time.Bilateral uterine ovarian arteries were clamped for 11 mins to make intrauterine distress model of the fetal rats.The brains of fetal rats were removed after 3 days of reperfusion.Brain sections(5 μm thick) were mounted and stained with Hematoxylin and eosin(HE).The profile of the hippocampus CA1 was evaluated under a light microscope and neuronal Lesion-index(LI) was calculated.MDA content of fetal rat brain was detected by thiobarbituric acid reaction method to determine the lipid peroxidation degree of brain.Results LI was (7.2±0.9) and MDA was (3.86±0.20) μmol·g-1 in group S.LI was 71.9±2.8 and the content of MDA was (9.10±0.45) μmol·g-1 in group IR, which increased significantly compared with those in group S(P<0.01).LI was (40.8±2.6), (21.4±1.4), (20.1±1.3) and the content of MDA was (7.32±0.41), (5.65±0.27), (5.44±0.28) μmol·g-1 in propofol groups, which decreased significantly compared with those in group IR(P<0.05).LI and the content of MDA was (51.2±2.3), (7.54±0.31) μmol·g-1 in group B,respectively, reversing partly the neuroprotevtive effect of propofl.Conclusion Propofol could protect the neurons in hippocampus CA1 region of fetal rat against intrauterine distress by reducing the concentration of MDA in the brain.

OBJECTIVE To study the effect of the intervention of monitoring-training-planning(MTP) on use of antibacterials and injections for pediatric acute upper respiratory infection.METHODS In accordance with selected drug use indicators(SDUIS),the pediatric outpatient prescription of acute upper respiratory infection was selected in our hospital from Jun to Aug 2006 as the baseline,and intervented by MTP,then the investigation of post-interfervention was carried out after a month,and then re-intervention research was made,so the cycle continued.RESULTS The percentage ratio of antibacterials,and injection usage,and the average drug fee in pediatric outpatient prescription for acute upper respiratory infection in our hospital was decreased from 75.00%,61.67%,40.33% and 54.29 yuan to 7.00%,5.00%,3.00% and 39.16 yuan,respectively after four rounds of MTP(all P

Objective To investigate the radiation doses for the patients undergoing interventional radiology and to analyze the dose - influencing factors.MethodsThe clinical data of 461 patients undergoing interventional radiology,including cerebral angiography ( CEA ),cerebral aneurysm embolism ( CAE ),superselective hepatic arterial chemoembolization ( SHAG ),coronary angiography ( COA ),percutaneous intracoronary stent implantation ( PIS1 ),cardiac radiofrequency catheter ablation ( RFCA ),and permanent cardiac pacemaker implantation(PCPI) were collected to observe the cumulative air kerma (CAK),dose area product (DAP),and fluoroscopy time,and effective dose was estimated using the conversion factors.Results The effective doses for CEA,CAE,SHAG,COA,PISI,RFCA,and PCPI were (0.33 ±0.20),(0.49 ±0.35),(6.92 ±4.19),(0.76 ±0.91),(2.35 ± 1.47),(0.50 ±0.74),and (0.67 ±0.70) Sv,respectively.In 126 of the 416 patients (26%),the effective doses were greater than 1 Sv,and the effective doses of 10 person-times were greater than 10 Sv,all of which were observed in the patients undergoing SHAG.The CAK values for CEA,CAE,SHAG,COA,PISI,RFCA,and PCPIwere (0.55 ±0.43),(1.34 ± 1.11),(0.95 ±0.57),(0.32 ±0.31),(0.91 ±0.33),(0.16 ±0.22),and (0.15 ±0.14) Gy,respectively.The CAK values were greater than 1 Gy in 59 of the 461 patients ( 12.8% ),greater than 2 Gy in 11 cases (2.4%) ,and greater than 3 Gy in 1 CEA cases and 1 CEA case,respectively.Conclusions There is a wide variation range in radiation dose for different procedures.As most interventional radiology procedure can result in clinically significant radiation dose to the patient,stricter dose control should be carried out.

Objective To study the deficiency of serf-regulation in impulsivity children with attention deficit hyperactivity disorder(ADHD)based on both procedures of action and inhibitory control.The event related potentials(ERPs)component P3 in Go/NoGo tasks was analyzed.Methods There were 15 impulsive children with ADHD and15 normal children in control group.Their age was from seven years old to eleven years old.The Go/NoGo stimulate-response model was adopted in the ERPs test.The occurrence of Go and NoGo trials was equal probability(each of 50%).Results(1)The high impulsive children had slower Go-RTs(reaction times)in making correct response than normal children,tended to be faster of NoGo-RTs in making error response and had lower correct rate.(2)P3amplitudes in both control and ADHD children had the tendency of Go-P3 > NoGo-P3,especially significant at CPz and Pz in ADHD children,showed the trend of parietal central to parietal maximum and the frontal minimum,The NoGo-P3 amplitude of ADHD group was smaller especially significant at FCz and Cz,and tended to be smaller than control on left hemisphere.(3)NoGo-P3 is smaller in impulsive children with ADHD than normal children,most significant at FCz.(4)Brain maps showed that impulsive children with ADHD were lower activation significantly in the right frontal area.Conclusions The efficiency of ADHD in action is lower.The behavior regulation in impulsive children is limited.Go/NoGo-P3 reflects action processing and attention.The left parietal lobe to central area is engaged much more in action procedure and attention.This research shows the evidence of weakened parietal cortex and right frontal cortex in impulsive children with ADHD.

Objective To describe the clinical features of patients with hemorrhagic fever with renal syndrome (HFRS) in popular period and other period.Methods All the HFRS patients from epidemic areas in Xi' an were surveyed retrospectively.The sociodemographic data,symptom characteristics and laboratory test results were collected.Chi-square test,rank test were used to analyze the data.Results Totally 429 HFRS cases were recruited including 280 male (65.3％) and the male/female ratio was 1.9 ∶ 1.Adults with 16-60 years of age were the main group,which accounted for 74.8％ of the total cases.The constituent ratios of cases with 16-60 years of age in popular period and other period were 76.1％ (245/322) and 71.0％ (76/107),respectively; the sex ratios were 1.93∶1 and 1.74∶1,respectively; the time from fever onset to hospitalization was 3 d and 4 d,respectively; the time of hospitalization was both 10 d; the proportions of emergency cases were 59.8％ (189/316) and 67.6％ (71/105),respectively; the proportions of cured cases were 56.4％ (181/321) and 43.4％ (46/106),respectively.The clinical features were not significantly different between popular period and other period (all P＞0.05).The immunoglobulin M (IgM) antibody positive rate was 85.4％ (315/369) and those in popular period and other period were 88.4％ (251/ 284) and 75.3％ (64/85),respectively (x2 =8.968,P＜0.01).There was a positive correlation between symptom severity and outcome of discharge (x2=18.558,P＜ 0.01),the more slight symptoms were related with the better outcome.Conclusion The clinical features are similar in cases from popular period and other period from Jan 2008 to Jun 2011.

Objective　To prevent the after cataract induced by lens epithelial cells proliferation from postoperative cataract, monoclonal antibody (McAb) specific for rabbit lens epithelial cell is made, it will be the carrier further to be conjugated with cytotoxin. The conjugations will inhibit lens epithelial cells growth and not damage the other tissues of eye. Thereby McAb is the experimental bases of preventing after cataract.Methods　BALB/c mice were immunized by mixture of rabbit lens epithelial cells and Freund's adjuant. The immunized mouse spleen cells were fused with parental mouse myeloma cells (BALB/c　SP2/0) using polyethylene glycol (PEG-4000). The fused cells were selectively cultured by hypoxanthine, aminopterin and thymidine (HAT) culture medium. The specificities of the supernatant from hybridomas were tested by indirect immunofluorescence and immunohistochemistry SP (Streptavidin peroxdase conjugated method). The positive hybridomas were further cloned three times by methylcellulose culture medium to ensure monoclonality. At last, the consensual reaction of McAb was tested on human eye tissues.Results　Hybridomas were produced by fusion of spleen cells of immunized mice and mouse myoloma cells (SP2/0) with PEG-4000, and grown selectively in medium containing HAT after 16 days. Antibodies of the supernatant from hybridomas were tested on frozen sections of rabbit lens epithelial cell by indirect immunofluorescence. Only a positive clone secreted McAb against antigen of rabbit lens epithelial cell. The specificity of McAb was tested on paraffin sections of whole rabbit eye and whole human eye by immunohistochemistry SP. The results indicated that McAb was only positive to rabbit lens epithelial cell membrane and it was negative to the other tissues of rabbit or whole human eye tissues.Conclusions　McAb specific for rabbit lens epithelial cell was manufactured successfully. The specificity of McAb was strong. There was no consensual reaction on human eye tissues. It might be the experimental bases of further targeting chemotherapy on after cataract.

BACKGROUND:Transplantation of stem cells has a beneficial effect on myocardium revascularization and improving cardiac function after myocardial infarction, and HLA-G protein contributes to the formation and maintenance of the immune tolerance.
OBJECTIVE:To investigate the transplantation effects of human umbilical cord mesenchymal stem cells at different gestational age with different HLA-G expression levels on myocardium revascularization after myocardial infarction in rabbits.
METHODS:Thirty healthy New Zealand rabbits were selected and were randomly divided into human smal gestational age umbilical cord-derived mesenchymal stem cells transplantation group, human ful-term umbilical cord-derived mesenchymal stem cells transplantation group and control group. After the rabbits models of acute myocardial infarction had been established, the former two groups were infused different umbilical cord-derived human umbilical cord mesenchymal stem cells labeled with 5-bromo-2-deoxyuridine into the edge and center of myocardial infarct region by multipoint injection. Rabbits in the control group were subjected to an equal volume of serum-free culture medium.
RESULTS AND CONCLUSION:Four weeks after celltransplantation, 5-bromo-2-deoxyuridine-positive cells were found surrounding the infarct site in both transplantation groups. Myocardial fibrosis and myocardial infarct size were significantly lower in both transplantation groups than those of the control group (P<0.05), and there was a significant difference between the two transplantation groups (P<0.01). The positive staining of factor VII indicated that capil ary density was increased significantly in the smal gestational age umbilical cord-derived mesenchymal stem cells transplantation group as compared with the ful-term umbilical cord-derived mesenchymal stem cells transplantation group (P<0.01), and a sstatistical difference was found between two transplantation groups and the control group (P<0.01). Transplantation of human umbilical cord mesenchymal stem cells with high HLA-G expression increases new capil ary vessels and improves myocardium revascularization. Al indicate that human smal gestational age umbilical cord mesenchymal stem cells have the potential to become the better source of cardiomyocytes transplantation.