The basic functions of the Na+/K+ -ATPase is to maintain the balance of the Na+/K+ electrochemical gradient. The latter is indispensable for maintaining cell osmotic pressure,regulating cell volume,and maintaining excitable membrane resting potential. The maintenance of the Na+/K+ -ATPase activity plays the important roles in neurotransmitter uptake in neurons and Ca2+ effiux. The decreased Na+/K+ -ATPase activity and dysfunction participate in the process of ischemic brain injury after cerebral ischemia. Ischemic precondi-tioning induces ischemic tolerance by maintaining the Na+/K+ -ATPase activity after ischemia.Cardiotonic steroids and citicoline may play a neuroprotective effect on cerebral ischemia by improving the Na +/K+ -ATPase activity.

Objective To develop a radionuclide parameter database on internal contamination in nuclear emergencies. Methods By researching the radionuclides composition discharged from different nuclear emergencies, the radionuclide parameters were achieved on physical decay, absorption and metabolism in the body from ICRP publications and some other publications. The database on internal contamination for nuclear incidents was developed by using MS Visual Studio 2005 C# and MS Access programming language. Results The radionuclide parameter database on internal contamination in nuclear emergency was established. Conclusions The database may be very convenient for searching radionuclides and radionuclide parameter data discharged from different nuclear emergencies, which wonld be helpful to the monitoring and assessment of internal contamination in nuclear emergencies.

Objective To organize measurement comparison among provincial CDC gamma spectrometry laboratory for verification of the precision and accuracy of the measuring results from each laboratory and to improve the ability and level for radionuclides measurement in building materials.Methods The method for gamma spectrometry measurement comparison was referred to the method of IAEA international comparison in 2002.Results The results of these labs in this comparison agreed with the reference results well.About 50% labs' relative biases were less than 5%,over 80% labs were less than 10%.Conclusions The results of this comparison showed that the analysis method for the radioactivity content in building materials by gamma spectrometry in each lab was credible and meet the request of the standard GB 6566-2001 "Radioactive Nuclide Limit for Building Materials".

Objective To investigate the levels of sICAM 1 and sE selectin in patients with chronic hepatitis(CHC) and to study their roles in judge of response to IFN ? 2b treatment. Methods sICAM 1 and sE selectin levels were measured in 32 cases of CHC before and after treatment of IFN ? 2b by enzyme linked immunosorbent assay(ELISA), levels of HCV RNA was detected by quantitative PCR and serum ALT activity was also detected. Results Levels of sICAM 1 and sE selectin in CHC patients were significantly higher than those in normal controls(P

Objective To assess the accuracy and precision of γ-spectrometry analysis, and to obtain accurate and valid measurement results in the middle term and long term. Methods A nationwide intercomparison on gamma-ray spectrometry measurement of activity concentration of 226Ra, 232Th and 40K in soil and building material was organized by National Institute for Radiological Protection( NIRP) , China CDC. Results 15 laboratories participated in this intercomparison, with 13 laboratories produced acceptable results. Only 2 laboratories were classified as " not acceptable" , including one for inappropriate accuracy in determination of 40K and another for inappropriate precision determination of 226Ra in both kinds of the samples. Through comment and discussion, the second round intercomparison got satisfactory results. Conclusions The overall measurement results of samples for intercomparison are in close agreement with the reference values. Most of the laboratories involved in the intercomparison have good ability in γ-spectrometry analysis.

Objective To describe a simplified generic procedure to evaluate the external exposure dose evaluation in radiological emergency, and to compile the corresponding computer software. Methods Based on the related reports of IAEA, this generic procedure of external exposure dose evaluation in radiological emergency was compiled to computer software by Visual Basic 6.0. Results The generic procedure for evaluation of external exposure dose could be used in the external exposure radiation accident emergency. The actual accident data were input in this software, then the results from this software agreed with those of the actual accident well. The maximum error was 40% , and the minimum error was 6%.Conclusions The generic procedure for evaluation of external exposure dose could provide practical emergency response guidance. The software might help to evaluate the accidental dose more quickly and accurately, and provide scientific basis to take the immediate response actions.

Objective To investigate the reproducibility and influencing factors of relative quantification of phosphorus metabolites with two-dimensional chemical shift imaging (2D CSI) in rabbit liver. Methods Using 2D CSI MRS, 500 ml phosphate (NaH2PO4) solution phantom with 0. 05 mol/E concentration and one healthy rabbit were scanned 30 times respectively in one day and rescanned 30 times in the next day, and the stability of MR scanner and reproducibility of within-run and between-days in the same individual were analyzed. Each of thirty rabbits was scanned and rescanned one time respectively in different days, and the reproducibility of between-days in one group was analyzed. The data were statistically analyzed with t tests. Results (1) Phosphate solution phantom had a good reproducibility of within-run with the coefficient variation (CV) of 4. 92% and 5. 12% respectively in different two days. No significant change of phosphorus metabolites was detected in between-days, which was 16. 68 ± 0. 82 and 16. 56 ± 0. 85 respectively(t = 0. 665, P > 0. 05 ). (2) The CV of metabolites in one healthy rabbit ranged from 8. 04% to 34. 13%. Among the metabolites, β-ATP had the best reproducibility with the CV less than 10%. PME was 0. 88 ± 0. 28 and 0. 88 ± 0. 30, PDE was 4. 35 ± 0. 66 and 4. 35 ± 0, 66, Pi was 0. 95 ± 0.30 and 0.97±0.28, α-ATP was 5.58±0.60 and 5.61±0.61, β-ATP was 2.70±0.22 and 2.71± 0. 22, γ-ATP was 2. 20±0. 63 and 2. 18±0.44 respectively, no significant changes of metabolites were detected in between-days( P >0. 05 ). (3) The CV of metabolites in 30 healthy rabbits ranged from 8.48% to 36. 21%. Among the metabelites, β-ATP had the best reproducibility with CV less than 10%. PME was 0. 84 ± 0. 30 and 0. 79 ± 0. 28, PDE was 4. 29 ± 0.72 and 3.94 ± 0. 84, Pi was 0. 91 ± 0. 28 and 0. 92 ± 0. 31, α-ATP was 5.65±0. 66 and 5. 36±0. 60, β-ATP was 2. 71±0. 23 and 2. 66±0. 25, γ-ATP was 2. 07±0. 29 and 1.99±0. 37 respectively, no significant changes of metabolites were detected in between-days (P > 0. 05). Conclusions The relative quantification of hepatic β-ATP may be most reliable among the phosphorus metabolites for rabbit liver because of its good reproducibility and small CV. The quantification of phosphorus metabolites by 31p MRS with 2D CSI in rabbit liver is affected by many factors.

Objective To investigate the optimal dose of apocynin to protect severe acute pancreatitis (SAP) and SAP caused intestinal injury in rats. Methods A total of 53 SPF male Wistar rats were randomly allocated into five groups:sham operation group (SO group, n=10), SAP group (n=12), low-dose apocynin group (25 mg/kg,n=11), medium-dose apocynin group (50 mg/kg, n=10) and high-dose apocynin group (100 mg/kg,n=10). SAP model was prepared by retrograde infusing 5%sodium taurocholate (1 mL/kg) into biliopancreatic duct of rat. At thirty minutes before modeling, apocynin was injected into rat to intervention. The survival condition was recorded at 12 h after modeling, and blood samples were obtained for detecting serum amylase (AMY), alanine aminotransferase (ALT) and creatinine (Cr). Pancreatic and ileal tissue samples were obtained for HE staining and pathological examination. Results Two rats died in SAP group and one died in low-dose apocynin group. The quantity of ascites, the levels of AMY, ALT, Cr and pancreatic and intestinal pathologic scores were significantly increased in SAP group than those in SO group (P<0.05). Except the levels of Cr and intestinal pathologic score, there was no significant difference between low-dose apocynin group and SAP group. The quantity of ascites ascites, levels of AMY, Cr and pancreatic and intestinal pathologic scores were significantly lower in medium-dose and high-dose apocynin groups than those in SAP group (P<0.05). The levels of ALT and Cr were significantly higher in high-dose apocynin group than those of medium-dose apocynin group (P<0.05). Conclusion Apocynin improves SAP symptoms and reduces SAP caused intestinal injury in rats, which may be related to the inhibition of NOX activity, and 50 mg/kg of apocynin is the optimal dose.

Objective To test a full range of processes of sample collection,preparation,measurement and analysis by conducting the intercomparison of gamma-ray spectrometry measurement and analysis of radionuclides among key laboratories,so as to facilitate the development of gamma-ray spectrometry measurement and analysis technology.Methods To complete the collection and preparation of soil samples by Chinese Center for Disease Control and Prevention (CDC) laboratory and to measure and analyze the content in two soil samples of 214Pb,214Bi,208TI,228Ac,40K and 137Cs by three laboratories using gamma-ray spectrometry.Results The value calculated by any two laboratories were less than 1 in terms of assessment standards agreed by these three laboratories and based on the activity concentrations and the total uncertainty reported from them.The measurement results from our lab were acceptable.Conclusions Measurement results from these three laboratories are in agreement to some extent.This intercomparison activity has tested the analytical ability of the three laboratories and raised the level of our laboratory in testing homogeneity of sample preparation.

Objective To establish a method for estimating internal dose from aerosol inhalation in non-uranium miners.Methods Aerosol samples in a tunnel in Dongchuan Copper Mine in Yunnan Province were collected by portable high flux air sampler.Radionuclides collected at the sampler filters were analyzed by the gamma spectrometry.Annual committed effective dose due to inhalation of the aerosol dust was estimated using the formula provided by ASTM.Results Radionuclides collected in two aerosol samples were anlayzed,the annual committed effective doses due to inhalation of 1 μm and 5 μm aerosol were estimated.Conclusions The method of using high flux air sampling and gamma spectrometry is explored to estimate the dose from aerosol inhalation.