Objective To establish a simple and rapid method for determination of trace chromium(Ⅵ) in drinking water. Methods In the weak acid solution containing n-butyl alchhol,trace chromium (Ⅵ) in the water connected with diphenylcarbazide and sodium dodecyl sulfate into purplish red ternary iron compound,which could be extracted by chloroform and quantified at wavelength of 550 nm. Results The detection limit was 0.001 mg/L,the RSDs were 1.1%-1.4% and the recovery rate was 96%-113%. Conclusion The method was rapid,simple and the sensitivity and accuracy will meet the requirement of standard test methods for drinking water.

By inflicting the hindlimbs of dogs with steel bullets in different velocities, a model of traumatic stress was reproduced. The contents of myelin basic protein (MBP) and endothelin 1 (ET1) in cerebrospinal fluid (CSF) were determined with ELISA and radioimmunoassay methods, and the wltrastructural changes in limbic system were studied with neuropathological techniques. The MBP level and ET1 contents increased markedly in CSF, and neuronal degeneration and nerve fiber demyelination were seen in the hypothalamus and hippocampus in high speed missile group. The results indicate that the hypothalamus and hippocampus were vulnerable in severe injury of remote tissues,and it might be one of the important neuropathological basis for changes in the early stage of posttraumatic stress disorder (PTSD). The results also suggested that the CSF MBP and CSF ET1 determinations might serve as sensitive indicators for central nervous system damage in stress disorder following severe injury.

Objective To develop a rapid determination method of nitrate-N in water.Methods In concentrated sulfuric acid,2-isopropyl-5-methyphenol reacts on nitrate and produces the nitro-compound which may turn into the yellow compound in the alkaline solution for the moleculars rearrange.The content of nitrate-N in water can be calculated according to the absorption value at the wave length of 415 nm.Results A good linear relation was found between the concentrations of nitrate-N and the absorption values in the range of 0-15.0 mg/L.The lowest determination concentration was 0.25 mg/L,the recovery rates were 96%-108% and RSD was 1.6%-4.0%.The results were consistent with those determined by UV spectrophotometry.Conclusion The method was simple,sensitive,rapid and accurate.

Objective To establish a rapid determination method for sulfate in water. Methods In the weak acid solution, sulfate connected with barium chromate into sulfate barium and chromate. Surplus barium chromate precipitated when adding the mixture of CaCl2 and NH3?H2O. The chromate replaced by sulfate was detected at wave length of 420 nm. Results The RSDs were 1.8%-6.8% and the recovery rates were 98.9%-101.0%. Conclusion The method was rapid, simple and its sensitivity and accuracy can meet the requirement of standard examination methods for drinking water.

Objective To investigate the value of combination of B-flow imaging and spatio-temporal image correlation in prenatal diagnosis of congenital heart diseases. Methods Volume images of 50 normal fetuses and 14 fetuses with congenital heart diseases were recruited in the study. Surface mode was used to reconstruct the volume images. Results Sixty-three and twenty-six qualified volume images were obtained in 50 normal fetuses and 14 fetuses with congenital heart diseases respectively. All volume images were reconstructed successfully and showed the spacial relationship of cardiac blood vessel directly. Conclusions The combination of B-flow imaging and spatio-temporal image correlation was feasible and useful in prenatal diagnosis of congenital heart diseases.

Objective To assess the reliability and validity of the Pittsburgh sleep quality index (PSQI) .Methods The cross-sectional survey was conducted in the outpatient department of this hospital .544 insomnia and non-insomnia voluntary participants (18-65 years old) from July to October 2011 were assessed with PSQI and the insomnia severity index (ISI) ,which were randomly delivered to them .Results The test-retest reliability of PSQI was 0 .994 .The split-half reliability coefficient of PSQI was 0 .824 . The overall Cronbach′s alpha coefficient was 0 .845 .The confirmatory factor analysis showed that the fitting indicators for the χ2/df ,root mean square error of approximation(RMSEA) ,non-normed fit index(NNFI) ,comparative fit index(CFI) and goodness-of-fit index(GFI) were 4 .83 ,0 .09 ,0 .96 ,0 .98 and 0 .97 respectively .The correlation coefficient between the PSQI and ISI was 0 .842 . The correlations coefficients between PSQI with the questionnaire type ,interview date and interview department were -0 .046 , 0 .276 and -0 .331 .Grouping by individuals with or without insomnia ,the area under the receiver operator characteristic curve (ROC) for PSQI was 0 .944(95% CI:0 .925-0 .963) .Conclusion PSQI has good reliability and validity ,and could be used for the sleep quality comprehensive evaluation in the patients with insomnia .

AIM: To investigate the protective effect of rifampicin on rotenone-induced apoptosis of dopaminergic neurons and expression of ?-synuclein in rats.METHODS: Highly selective lesions and high expression of ?-synuclein in nigrostriatal dopaminergic neurons in rats were induced by chronic subcutaneous exposure to rotenone at dose of 1.5 mg?kg-1?d-1 for 3 weeks.At the same time,rifampicin was administered at dose of 30 mg?kg-1?d-1 by intragastric administration for 3 weeks.The changes of behavior,pathology and immunoreactivity of TH and ?-synuclein in SNc were observed.RESULTS: Obvious changes of behavior,pathology and TH immunoreactivity in SNc were observed in male SD rats injected subcutaneously with rotenone and rifampicin protected rats against these toxic effects induced by rotenone.CONCLUSION: Rifampicin has extensive protective effects against rotenone-induced neurotoxicity,which is related to inhibiting the expression and aggregation of ?-synuclein.

Objective To establish the normative data of the 2D and 3D ultrasound (US)measurements of the developing fetal thymus and comparing the 2DUS and 3DUS measurements of the fetal thymus. Methods The normal fetuses' thymus of 567 cases were assessed, and maximum transverse diameter(MTD),antero posterior diameter (APD), suprainferior diameter (SID), maximum transverse area (MTA) were measured by 2DUS,and thymic volume(TV) was measured by 3DUS. Results 2DUS,3DUS assessments of the fetal thymic MTD, APD, SID, MTA and TV were possible in 541 of 567 normal singletons. The fetal thymic 2D diameters/area and 3D volume grow with the gestational age(GA) in linear correlation. The 3D-US TV measurements and GA was significantly higher than that of any individual 2DUS measurements and GA ( P ＜0.05). Conclusions This study presents the normative data of the 2DUS and 3DUS measurements of the developing fetal thymus. 3DUS fetal thymus volume is more significantly correlated to GA than the other 2DUS measurements, which indicates 3DUS measurement of the fetal thymus is more accurate than that of 2DUS.

Objective To build the indicators system for clinical pathway management as required by clinical pathway control.Methods An indicators system was proposed by means of evidence-based review,focus group discussions,and ratings of the indicators' importance by doctors and nurses.A multidisciplinary panel of 60 experts from across the country were selected.A 3-round Delphi survey was made on the proposed indicators.The weights of the indicators were established by analytical hierarchy process (AHP).The response rate,Cronbach's α,and the authority coefficient of experts were used as a measure of reliability.Results The response rates of the 3 rounds were 85％,70％,and 94％; the experts authority coefficient was 0.80.The ccoefficient of variation falls with the rising number of consultations.The Kendall's W ranged from 0.40 to 0.83.Following the 3 rounds,consensus was achieved among experts as such a system comprising three first-level,9 second-level,and 36 third-level indicators.Conclusion The expert consultation has achieved reliable results.The established indicators system can serve as a useful instrument for standardized development of clinical pathways management and constant improvement.

Objective To investigate the clinical value of velocity vector imaging (VVI) in the assessment of cardiac torsion in fetuses with gestational diabetes mellitus(GDM).Methods Digital dynamic four-chamber views of 98 fetuses with gestational diabetes mellitus and 135 normal fetuses were collected and analyzed using VVI.Left ventricular(LV) peak apical rotation of endocardium and epicardium at basal and apical level were measured,LV peak torsion was calculated.Results 140 of 233 cases were analyzed successfully.Direction of LV peak apical and basal rotation of endocardium and epicardium in fetus could be clockwise or counter clockwise,however apical and basal level was opposite.LV peak apical and basal rotation of endocardium and epicardium in fetus were stable throughout gestation ( P ＞ 0.05).LV peak rotation of endocardium was higher than that of epicardium in both apical and basal level.The peak rotation　in apical level of endocardium and epicardium was higher than that in basal level( P ＜0.05).LV peak　torsion of endocardium was significantly higher than that of epicardium( P ＜0.05).Compared with normal　group,LV peak rotation of endocardium and LV peak torsion in fetus with GDM were higher( P ＜0.05).　Conclusions VVI can measure the LV rotation and torsion parameters,and evaluate the cardiac function of　GDM fetus.