Associations between psychosocial stress in early and middle adolescence with emotional and behavioral problems one year later / 中国学校卫生

Objective@#This study explored the predictive effects of psychological stress in early and middle puberty on subsequent emotional and behavioral problems.@*Methods@#A cohort of 911 boys and girls from primary and secondary schools in Chongqing was studied. Psychological stress was measured in early and middle adolescence, and the levels of emotional and behavioral problems were determined in one year follow up. Logistic regression analysis was used to analyze the effects of psychological stress in early and middle adolescence on subsequent emotional and behavioral problems.@*Results@#The average psychological stress score in early and middle adolescence was (27.96±24.95), and the average scores of internalized and externalized behavioral problems and overall problems one year later were (8.21±8.46)(6.21±5.87) and (37.90±24.68) respectively. When grouped by gender, these scores, as well as the detection rate of anxiety and depression, withdrawal, physical discomfort, thinking problems, internalization problems and overall problems, were higher in girls than boys (t/Z=-6.38，-5.63，-6.06，-3.74，-6.80，-5.47， χ 2=15.88，12.01，3.92，6.64，24.67，15.88， P <0.05). Logistic regression showed that the psychological stress scale score was a risk factor for internalized and externalized behavioral problems and overall problems( P <0.05).@*Conclusion@#Psychological stress levels in early and middle puberty have a positive predictive effect on emotional and behavioral problems in the following year.

Associations between psychosocial stress in early and middle adolescence with emotional and behavioral problems one year later / 中国学校卫生

Objective@#This study explored the predictive effects of psychological stress in early and middle puberty on subsequent emotional and behavioral problems.@*Methods@#A cohort of 911 boys and girls from primary and secondary schools in Chongqing was studied. Psychological stress was measured in early and middle adolescence, and the levels of emotional and behavioral problems were determined in one year follow up. Logistic regression analysis was used to analyze the effects of psychological stress in early and middle adolescence on subsequent emotional and behavioral problems.@*Results@#The average psychological stress score in early and middle adolescence was (27.96±24.95), and the average scores of internalized and externalized behavioral problems and overall problems one year later were (8.21±8.46)(6.21±5.87) and (37.90±24.68) respectively. When grouped by gender, these scores, as well as the detection rate of anxiety and depression, withdrawal, physical discomfort, thinking problems, internalization problems and overall problems, were higher in girls than boys( t/Z =-6.38，-5.63，-6.06，-3.74，-6.80，-5.47， χ 2=15.88，12.01，3.92，6.64，24.67，15.88， P <0.05). Logistic regression showed that the psychological stress scale score was a risk factor for internalized and externalized behavioral problems and overall problems( P <0.05).@*Conclusion@#Psychological stress levels in early and middle puberty have a positive predictive effect on emotional and behavioral problems in the following year.

Comparison of emotional and behavioral problems between preschool firstborn children across the transition to siblinghood and the only children / 中国学校卫生

Objective@#To compare the emotional and behavioral characteristics of preschool firstborn children across the transition to siblinghood with the only children in a district of Chongqing.@*Methods@#Data were derived from a cohort study on firstborn children transition to siblinghood. Totally 882 firstborn children (3.58±1.25) years old and 329 only children (3.98±1.02) years old were recruited from two hospitals and 19 kindergartens in a district of Chongqing, respectively. Their mothers filled out the parental version of Child Behavior Checklist (CBCL) and self designed questionnaire.@*Results@#The overall scores of emotional and behavioral problems of firstborn children and only children were (25.17±18.82) and (31.75±18.64). The results of rank sum test showed that the scores of the firstborn children in all dimensions, internalizing and externalizing behavior problems and overall emotional and behavioral problems were lower than those of the only children ( P <0.05). Chi square test results showed that the detection rates of internalizing, externalizing and overall emotional behavior problems in only children(12.77%, 13.07%, 14.59%) were higher than those in firstborn children(8.28%, 8.28%,8.16%) ( χ 2=5.62, 6.36, 11.09, P <0.05). Multiple linear regression showed that after adjusting for age, gender, family economic pressure, temperament type of children, family atmosphere and family type, the scores of internalizing problems, externalizing problems and overall problems of the only children were still higher than those of the firstborn children ( B =1.54, 2.32, 6.81, P <0.05).@*Conclusion@#The firstborn children across the transition to siblinghood show less emotional and behavioral problems than the only children, and the scores and detection rates of all types of emotional and behavioral problems of the firstborn children are lower than those of the only children.

Value of FibroScan in liver grafts of brain-death donor prior to liver transplantation / 中华器官移植杂志

Objective:To explore the value of FibroScan in liver grafts from brain-dead donors (DBD) prior to liver transplantation (LT).Methods:Liver grafts from 52 DBD were examined using ultrasound and FibroScan before LT. The causes of death were cerebral hemorrhage ( n=25), brain trauma ( n=21) and ischemic-hypoxic cerebropathy ( n=6). Blood samples were tested before LT and a biopsy was performed pre- or intra-operation for determining pathology. The diagnostic accuracy of FibroScan results was compared with that of pathological examinations. The latter is a gold standard for evaluating liver grafts. The eligible donors were grouped by stage of liver fibrosis (F0-F4) and steatosis (S0-S3) based upon Kleiner's scoring system of nonalcoholic fatty liver disease. Results:The value of liver stiffness (LS) significantly rose in group F1 as compared with group F0 (8.74±1.32) kPa and (5.93±1.64) kPa respectively ( P<0.01). The value of LS had a significantly positive correlation with liver graft fibrosis stage ( r=0.73, P<0.01). The area under receiver operating characteristic curve (AUROC) was 0.93 for F1 stage fibrosis ( P<0.01). Significant differences existed in controlled attenuation parameter (CAP) among groups S0, S1 and S2 (173.30±38.36), (230.29±23.27) and (250.00±57.01) dB/m respectively ( F=12.41, P<0.01). CAP was correlated with liver graft steatosis stage ( r=0.64, P<0.01). And AUROC for S1/S2 stage steatosis in liver grafts was 0.89 ( P=0.002) and 0.83 ( P=0.007) respectively. Conclusions:With a high diagnostic accuracy, FibroScan quantifies fibrosis and steatosis in liver grafts from DBD and provides further imaging evidence for assessing liver grafts.

Cytological study on aptamer selection for bladder cancer through CELL-SELEX / 医学研究生学报

ObjectiveThe methods based on bladder cancer markers which could be applied to early diagnosis and postoperative recurrence monitoring of bladder cancer were current research hotspots. This study aims to screen aptamers that specifically recognize human bladder cancer cell lines (EJ, T24, BIU87) through cell-based systematic evolution of ligand by exponential enrichment (CELL-SELEX).MethodsFor CELL-SELEX screening, bladder cancer cell lines EJ, T24, and BIU87 were used as positive control cells. HCV 29 (human normal urothelial cell line), 293T (human embryonic kidney cell line), huh7 (human hepatocellular carcinoma cell line) were used as negative control cells. PCR upstream primers were labeled with FITC, downstream primer was labeled with Biotin. ssDNA fragments collected from each round were amplified by PCR, and the amplified product was then purified using a DNA purification Kit. The biotin-streptavidin magnetic separation methods were used to isolate the PCR product to obtain secondary FITC-ssDNA for the next CELL-SELEX round. The screening process was monitored by flow cytometry. ssDNA pool with the highest binding rates to bladder cancer cell lines(EJ, T24, and BIU87) was selected to PCR amplification, product purification, molecular cloning, and sequencing. According to the sequencing results, the secondary structure of the aptamer was pre-simulated by Dnaman software. Aptamer labeled with FITC was synthesized in vitro, flow cytometry was used to detect the binding rate of the aptamer to bladder cancer cell lins (EJ, T24 and BIU87).ResultsWith the advance of the CELL-SELEX process, the binding rate of FITC-ssDNA to bladder cancer cell lins (EJ, T24, and BIU87) increased gradually. By the 15th round, the binding rate of FITC-ssDNA to EJ cells reached the highest level. The apt1 had the highest enrichment among the 15th round ssDNA pool. By the 18th round, the binding rate of FITC-ssDNA to T24 or BIU87 cells reached the highest level. The apt2 and apt3 had the highest enrichment among the 18th round ssDNA pool. DNA structure prediction showed that the secondary structure of apt1, apt2, and apt3 was mainly stem-loop structure. Flow cytometry showed that the highest binding rate was FITC-apt1 to EJ cells, FITC-apt2 to T24 cells, and FITC-apt3 to BIU87 cells, respectively. There is no significant combination between these aptamers with the negative cells.ConclusionIn this study, three kinds of aptamers with high specificity for bladder cancer cell lines were successfully screened by CELL-SELEX. The apt1 can specifically recognize EJ cells, apt2 can specifically recognize T24 cells and apt3 can specifically recognize BIU87 cells, all of which provide experimental evidence for early diagnosis and targeted therapy technology research of bladder cancer.

A comparative study of 3 types of myopia screening methods among children and adolescents / 中国学校卫生

Objective@#This study aimed to evaluate the validity and predictive value of different methods for myopia screening, and to provide the most effective method of myopia screening.@*Methods@#A total of 7 441 students of grade 1-12 selected from 36 primary and middle schools in 12 counties in Jiangsu Province were enrolled in this study for ophthalmological examination, and uncorrected visual acuity (UCVA, Plan A), noncycloplegic autorefraction (NCAR, Plan B) and combination of UCVA and NCAR (Plan C) were included in the examination. Receiver operating characteristics (ROC) curve was performed to determine the cut-off values (The gold standard is cycloplegic refraction: SE≤0.5 D), and positive predictive value, sensitivities, specificities and other indicators of three screening tests were compared and calculated.@*Results@#The AUC of the combination test for uncorrected visual acuity(UCVA) and noncycloplegic autorefraction (NCAR) was nearly 1(0.91, 95%CI=0.90-0.92), and the sensitivity, specificity, Yoden index, diagnostic coincidence rate, positive predictive value and negative predictive value were 92.4%，89.5%，0.82，91.1%，91.3%，90.8%, respectively, but the index of the younger pupils in primary schools was relatively low. The result of screening plan A for students of middle and high school students was the closest to that of myopia diagnosis.@*Conclusion@#Combination test, which was recommended by China National Health Commission, can be a practical solution for school students for myopic screening. Under the condition of no mydriatic refraction, Plan A could be considered for myopia screening especially for middle and high school students. For the younger pupils, it is suggested to use the internationally recommended myopia screening strategy, that is, SE ≤ 0.50D after mydriasis.

Application values of shear wave elastography and ultrasonic grading in liver grafts from brain death donor / 中华器官移植杂志

Objective To explore the values of shear wave elastography (SWE) and ultrasonic grading in liver grafts from brain death donor (DBD).Methods Liver grafts of 39 DBD cases were examined preoperatively by ultrasonography (US) and SWE.Blood samples were tested preoperatively.Based upon early allograft function of liver recipients,the donors were classified into early allograft dysfunction (EAD) and early allograft function normal (non-EAD) groups.The SWE/ US grading results of EAD group were compared with those of non-EAD group.Receiver operating curve (ROC) was employed for analyzing the diagnostic accuracy of SWE/US grading in EAD.Results The SWE value of EAD group was significantly higher than that of non-EAD group [(6.65 ± 2.69)vs.(3.50 ± 1.27) kPa,P＜0.05].Ultrasonic grading of EAD group was also significantly higher than that of non-EAD group (P＜0.05).The area under ROC curve (AUROC) of SWE in EAD was 0.939,optimal cut-off value 4.56 kPa,AUROC of ultrasonic grading 0.806 (P =0.003) and optimal cut-off value level 3.5.Conclusions SWE quantifies fibrosis in liver grafts of DBD with a high diagnostic accuracy.There are significant correlations between EAD after liver transplantation and SWE value of liver grafts and ultrasonic grading.SWE and ultrasonic grading may improve the assessments of liver grafts of DBD.

Expression and function of microRNA-218 in hepatocellular carcinoma / 国际检验医学杂志

Objective To study the expression level and function of micro RNA (microRNA)-218 in hepatocellular carcinoma (HCC) .Methods 46 cases of HCC surgery in the hepatobiliary surgery department of this hospital were selected and divided into the transfection group and nontransfection group .The expression ,proliferation and apoptosis of microRNA-218 and the expression level of B cell specific Maloney leukemia virus insertion site 1(Bmi-1) and cycling-dependented kinase 6(CDK6) in HepG2 cells were compared between the two groups .Results The expression level of microRNA-218 in HCC tissue was significantly lower than that in paracancerous tissues (P＜0 .05);the microRNA218 expression level was closely correlated with the clinicopathological characteristics such as tumor size and TNM stage(P＜0 .05);the HepG2 cell proliferation rates at 24 ,48 ,72 h after transfection in the transfection group were significantly lower than those in the nontransfection group(P＜0 .05);the HepG2 cell apoptosis rate in the transfection group was significantly higher than that in the nontransfection group(P＜0 .05);the Bim-1 and CDK6 expression levels after HepG2 cell transfection in the transfection group were significantly lower than those in nontransfection group(P＜0 .05) . Conclusion microRNA-218 can suppress the proliferation of HCC cells and promotes HCC cells apoptosis by down-regulating the Bim-1 and CDK6 expression level in potential targets .

Analysis on comparison results of multiple automated hematology analyzers within same laboratory / 国际检验医学杂志

Objective To evaluate the consistency of the test results detected by multiple automated hematology analyzers .Meth-ods The EP9-A2 guideline of NCCLS ,Passing-Bablok regression analysis and t test were adopted to compare the detection results of hemoglobin(HGB) ,hematocrit (HCT) ,red blood cell count(RBC) ,white blood cell count (WBC) and platelet(PLT) in 115 samples from patients by 5 automated haematology analyzers of the Sysmex XE-2100 ,the Sysmex XT-1800i ,the Sysmex XS-1000i , the Mindray BC-5300 and ABX pentra80 .The Sysmex XE-2100 was used as the reference instrument .Results In the detection of all the compared items including HGB ,HCT ,RBC ,WBC and PLT ,these automated hematology analyzers exhibited very good cor-relation(r>0 .97) ,whereas the individual parameters in 3 automated hematology analyzers appeared the proportional systematic differences and /or constant systematic differences ,including HCT in the sysmex XT-1800i ,HCT and RBC in the sysmex XS-1000i and RBC in the ABX pentra 80 .Conclusion The Passing-Bablok regression analysis combined with t test may identify the system-atic differences of the comparative results of 2 automated haematology analyzers ,the consistency of the comparative results of the automated hematology analyzers can not be evaluated by the simple correlation coefficient .

Study on preparation and tissue distribution of hydroxycamptothecin liposomes / 中国中药杂志

<p><b>OBJECTIVE</b>To develop HCPT liposome with small diameter and to study the tissue distribution of the HCPT liposome in rats.</p><p><b>METHOD</b>Modified solvent-injection method was used to prepare HCPT liposome. The entrapment efficiency, morphology, size and zeta potential were also investigated. The transformation temperature and the ratio of cholesterol to phospholipids were determined by fluorescence spectrophotometry. HCPT liposome and HCPT injection (5 mg x kg(-1)) were injected by tail vein in mice, respectively. The tissue concentrations of HCPT were determined by LC-MS/MS.</p><p><b>RESULT</b>Under selected process conditions, the HCPT liposomes were spherical and integrated with the mean entrapment efficiency of (96.83 +/- 2.32)%, the size of (180.5 +/- 4.5) nm and the zeta potential of--(32.1 +/- 1.3) mV. It showed that the optimum proportion of cholesterol to phospholipids was 1.5: 10, the optimum transformation temperature was 32.5 degrees C; HCPT liposome at a dose of 5 mg x kg(-1) led to higher concentration and longer duration of action compared with HCPT injection on market.</p><p><b>CONCLUSION</b>HCPT liposome prepared by solvent-injection method was characteristic of small mean diameter, high encapsulation efficiency and long circulation in vivo.</p>

Effects of dexmedetomidine conmbined with small-dose of sulfentanil on hemodynamics during anesthesia induction in patients undergoing off-pump coronary artery bypass grafting / 中华麻醉学杂志

Objective To investgate the effects of dexmedetomidine combined with small-dose of sufentanil on the hemodynamics during anesthesia induction in patients undergoing off-pump coronary artery bypass grafting.Methods Seventy-five ASA Ⅱ or Ⅲ and NYHA Ⅱ or Ⅲ patients aged 46-72 yr,weighing 59-86 kg,ejection fraction ≥45％,undergoing off-pump coronary artery bypass grafting,were randomly divided into 3 groups ( n =25):dexmedetomidine combined with small-dose of sufentanil group (group DS),small-dose of sufentanil group (group S1 ) and large-dose of sufentanil group (group S2 ).In group DS,dexmedetomidine 0.8 μg/kg (diluted with normal saline to 15 ml) was injected for 15 min at a rate of60 ml/h,while the same volume of normal saline were given in groups S1 and S2.Anesthesia was induced with midasolam 0.08 mg/kg and pipecuronium 0.12 mg/kg.After administration of the total dose of 1/3 midazolam and 1/8 pipecuronium,sufentanil 0.5,0.5 and 0.8μg/kg (diluted with narmalsaline to 10 ml) were injected in groups DS,S1 and S2 respectively.Then the rest of midazolam was injected.When BIS value ≤ 75,the rest of pipecuronium was injected.When BIS value ≤ 55,the patients were tracheal intubated and mechanically ventilated.PETCO2 was maintained at 30-35 mm Hg.The adverse ardiovascular events (hypertension,hypotension,tachycardia and bradycardia) and drugs intervention were recorded during anesthesia induction.Results Compared with group S2,the incidence of hypertension and tachycardia was significantly increased in group S1,the incidence of hypotension decreased in groups S1 and DS,the incidence of drug intervention decreased in group DS (P ＜ 0.05).Compared with group S1,the incidence of hypertension,hypotension and tachycardia was significantly decreased,the incidence of bradycardia increased,theincidence of drug intervention decreased in group DS (P ＜ 0.05).Conclusion Dexmedetomidine (0.8 μg/kg) combined with small-dose of sufentanil (0.5 μg/kg) is beneficial for keep the stable of hemodynamics during anesthesia induction in patients undergoing off-pump coronary artery bypass grafting.

Study on 5-carboxyfluorescein N-succinimidyl ester in detecting the degree of cross-linked allogenic tissue / 生物医学工程学杂志

This study was designed to creat a new method for detecting the degree of cross-linked allogenic tissue based on fluorescent technique. The thoracic aorta of New Zealand rabbits were divided randomly into four groups according to the concentration of Glutaraldehyde (GA), which were group A (control group-with no GA), group B (cross-linked with GA of 0.625%), group C (1.25%), and group D (2.5%). Each group was cross-linked with GA and reacted with 5-FAMSE, and then the fluorescence intensity was observed via fluorescence microscopy (analyzed with Image-Pro Plus 6.0, a professional image analysis software). The differences between groups in order of fluorescence intensity were found to be: group A > roup B > group C > group D (P < 0.01). Meanwhile, the tissue proteins extracted from aorta in each group were submitted to conventional polyacrylamide gel electrophoresis (PGE) after being cross-linked with GA; the result from this method was compared with that from the method of 5-FAMSE. In group A, the tissue proteins extracted from the aorta cross-linked with GA were obviously less than those not cross-linked with GA. However, this phenomenom was not clearly seen among the B, C and D groups. Nevertheless, 5-FAMSE can detect the degree of cross-linkage more conveniently and directly.

Research on short-term biological stability and cytotoxicity of allogenic arteries cross-linked by dye-mediated photooxidation in vivo / 生物医学工程学杂志

This study evaluated the biological stability and cytotoxicity of rabbit thoracic aorta cross-linked by dye-mediated photooxidation in vivo environment of blood flow. Rabbits, whose allogenic thoracic aorta was cross-linked by dye-mediated photooxidation (DMP, n=6) and glutaraldehyde (GA, n=6), were in the DMP group and GA group, respectively; rabbits, whose homogenic abdominal aorta was orthotopic transplanted (OT, n=6), were in the OT group. Then the donor arteries were transplanted into the position of the abdominal arteries of rabbits. After operation, the animals were fed for 1 month, then each of graft arteries was removed for observation. Biological stability was evaluated through histological analysis under optical microscope. Cytotoxicity was evaluated through ratio of coverage of endothelial cell (ES) under scanning-electron microscope. The results showed that no statistically significant difference was noted between DMP group and OT group (P>0.05); however, there was a significant difference between DMP group and GA group (P<0.01). The stability index in DMP group was much higher than that in GA group. There was a statistically significant difference between DMP group and GA group (P<0.01). Ratio was much higher in DMP group than in GA group. In conclusion, the arteries cross-linked by dye-mediated photooxidation treatment appeared to have higher biological stability and lower cytotoxicity in rabbit allogenic transplation model.