Objective:To study the long-term stability of 6MV photon beam on TrueBeam, which is a new linear accelerator introduced by Varian Medical System. Methods:QA BeamChecker Plus (QABC+, Standard Imaging Inc., Middleton, USA) was used to measure 6MV X-ray on TrueBeam linac as daily quality assurance (Daily QA). Dosimetric parameter, including output Constancy, flatness and symmetry, were employed to evaluate the dose delivery stability of TrueBeam linac. Results: Daily QA results of 18 months showed the dose output delta was (0.0%±0.7%), only once out of tolerance of 2%. The constancy of Flatness was excellent with the delta of (0.1%±0.1%). The symmetric of axial and transverse varied within 1%. Conclusion:The output constancy of TrueBeam with 6MV is very stable, as well as flatness and symmetry. It’s stable and reliable to implement Truebeam linear accelerator in clinical.

? amyloid protein(A?) including A?40 and A?42 are the important bioactive substances in vivo.Their toxic and beneficial attributes in the body depend on its concentration.The brain A? level is maintained by two balances under the physiological condition.The first balance is the generation involved in ?-secretase and ?-secretase and the degradation involved in neprilysin(NEP) and insulin-degrading enzyme(IDE) of A?. The second one is the balance between the receptor for advanced end glycation products(RAGE)-mediated influx and low-density lipoprotein receptor related protein 1(LRP1)-mediated efflux of A? across the blood-brain barrier(BBB).Breakdowning any one of the two balances would result in the aggregation and precipitation of A? in the brain,which is a crucial event in the pathogenesis of Alzheimer's disease(AD).This paper reviews the regulation of brain A? level under the physiological condition and the reducing strategies on the level of brain A? under the pathological condition for developing new drugs in the treatment of AD.

Animals ; Feasibility Studies ; Female ; Mice ; Mice, Inbred BALB C ; Plethysmography ; methods ; Tidal Volume ; physiology

Objective To investigate the changes of platelet aggregation rate and platelet surface CD 41+CD62P+ expression af-ter clopidogrel discontinuation in the patients with percutaneous coronary interventions (PCI)) .Methods The platelet aggregation rates and platelet surface CD41+CD62P+ in 52 PCI patients with oral clopidogrel for near 12 months and discontinuation soon were measured before clopidogrel therapy(T0 ) ,in 1 week after clopidogrel therapy(T1 ) ,1 week before clopidogrel discontinuation(T2 ) , 1 week(T3 ) and 1 month after clopidogrel discontinuation (T4 ) .Results Compared with T0 ,the platelet aggregation rate and the expression of platelet CD41+CD62P+ at T1 were significantly decreased ,the difference showing statistical significance (P<0 .05) , which at T2 maintained the lower levels ;which at T3 were increased ,which at T4 were recovered to those at T0 .The platelet aggre-gation rates at various time points were (44 .20 ± 18 .36)% ,(25 .38 ± 12 .10)% ,(23 .74 ± 8 .15)% ,(51 .79 ± 10 .55)% and(45 .97 ± 16 .42)% respectively ,and the positive rates of CD41+ CD62P+ were(12 .96 ± 11 .48)% ,(3 .93 ± 3 .33)% ,(4 .72 ± 3 .14)% , (13 .90 ± 10 .38)% and(10 .84 ± 8 .13)% ,respectively .Conclusion In the patients treated with 12-month clopidogrel after PCI ,the platelet aggregation rate and the CD41+CD62P+ positive rate are mildly increased at 1 week after clopidogrel discontinuation and gradually returned to the level before discontinuation at 1 month after clopidogrel discontinuation .

Objective: To compare Succinic Acid of Rhizoma Pinelliae in viarious areas in China.Method: Using the technology of TCL.Result:Succinic Acid in various areas in China are not very close to one another.The highest amount is in Shanxi Province(about 0.0254% )and the lowest amount is in Hunan Province(about 0.0038% ).Conclusion:There are obvious differences of Succinic Acid among various areas in China.Succinic Acid shoule be between 0.0038%～0.0254%

Objective To investigate the value of vessel size index(VSI) in grading oligodendroglioma by vessel size imaging technique. Methods Twenty-four histologically confirmed oligodendroglioma cases were enrolled (13 gradeⅡand 11 gradeⅢ) . All patients underwent conventional MRI scanning, followed by multi gradient-echo spin-echo sequence from dynamic susceptibility contrast perfusion to generate VSI maps. Region of interests were contoured on VSI color maps to obtain hot-spot value of mean VSI of microvasculature (VSImean) and maximum VSI of microvasculature (VSImax). Paraffin sections of each case was stained with CD34 to acquire microvascular caliber (VShis). Pearson correlation analysis was used to evaluate the correlation between VSImean, VSImax and VShis respectively. Mann-Whitney U test was used to compare VSImean, VSImax and VShis between grade Ⅱ and Ⅲ oligodendrogliomas. ROC analysis was performed to assess the effectiveness of VSImean, VSImax and VShis in grading oligodendrogliomas. Results Both VSImean and VSImax were strongly correlated with VShis (r=0.738, 0.705,P<0.05). For gradeⅡand Ⅲ oligodendrogliomas, VSImean were 38.93(17.96 to 81.18)μm and 91.49(36.94 to 144.68)μm, VSImax were 45.12(22.30 to 89.65)μm and 121.19(57.29 to 164.00)μm, VShis were 8.51(5.25 to 12.76)μm and 11.03(7.59 to 21.96)μm respectively. VSImean, VSImax, and VShis showed significant difference (Z=-3.505,-3.911, -2.729,P<0.05) between grade Ⅱ and Ⅲ oligodendrogliomas. ROC analysis revealed that the optimal cutoff value, sensitivity, specificity and AUC of VSImean was 52.58 μm, 90.91%, 92.31%, 0.923 respectively, 81.18μm, 90.91%, 100.00%, 0.972 for VSImax, and 9.01μm, 90.00%, 84.62%, 0.838 for VShis respectively. Conclusions Vessel size imaging derived VSI correlated well with histopathology. It could provide valuable information in the pre-operative grading of oligodendroglioma.

Objective To investigate clinical characteristics of moderate and severe ovarian hyperstimulation syndrome (OHSS) in assisted reproductive technique .Methods The clinical data of 179 cases with moderate and severe OHSS receiving in vitro fertili‐zation‐embryo transfer (including ICSI) in the hospital from June 2012 to April 2013 were analyzed retrospectively .According to the clinical characteristic ,the OHSS was classified as as the moderate type and severe type ,and the late type and early type . Results It was no statistics difference between moderate type and severe type in the patients age ,number of retrieved oocytes ,ad‐mission transaminase ,proportion of fibrinogen normal numbers(P> 0 .05) .But it was a statistics difference between moderate type and severe type in the occurring time days of hospitalization ,hematocrit on admission ,albumin value ,transaminase maximum ,albu‐min dosage used ,proportion of paracentesis number ,pregnancy rate(P < 0 .05) .It was no statistics difference between early type and late type in the patients age ,admission transaminase ,proportion of fibrinogen normal numbers(P> 0 .05) .But it was a statistics difference between early type and late type in the number of retrieved oocytes ,the proportion of moderate OHSS patients ,days of hospitalization ,hematocrit on admission ,albumin value ,transaminase maximum ,albumin dosage used ,proportion of paracentesis number ,pregnancy rate(P< 0 .05) .Conclusion Synthesizing OHSS patients′ blood indexes ,we can evaluated patients′ pathogenet‐ic condition ,the treatment of disease ,and took appropriate preventive measures as soon as possible .Patients with late type may be have more severe pathogenetic condition than patients with early type .

Objective:To explore the expression of IL-21 and the relationship with adenine nucleotide translocator antibody, ( ANT antibody ) in different courses of viral myocarditis ( VMC ) mice, and to explore the role and significance of IL-21 in VMC.Methods:To induced VMC mice model, BALB/c male mice were peritoneally injected ( IP ) with Coxsackievirus B3, mice peritoneally injected with PBS were taken as the controls.On 0,1,2,3,4 and 6 w after IP,the level of IL-21 mRNA in mice myocardic tissue was determined by real-time RT-PCR.The expression of IL-21 protein and ANT antibody in serum was evaluated by EILSA.Results:Comparing with the controls,the expression of IL-21 mRNA and protein increased from 1st week after IP,reaching the peak on the 2nd week,and maintaining a higher trend until 6th week.All the results at each time except that of 0 week were higher than those of controls(P<0.05).The levels of ANT antibody were also increased from 1st to 6th week,reaching the peak on the 2nd week all the results at each time except that of 0 week were higher than those of controls(P<0.05).Pearson analysis showed that there was rela-tionship between IL-21 and ANT antibody( r=0.88,P<0.01).Conclusion:The datas show that local significantly increased levels of IL-21 in myocardium and serum, and have positive relationship with the level of adenine nucleotide translocator antibody, which indicates that IL-21 may play a role in the pathogenesis of mice virus myocarditis.

Objective Due to redundant valuations and inaccurate quantities and specifications in processing temporary medical orders, expensive medicines, water and cream medications, program patches of electronic prescriptions included in the nurse work station were designed and developed. Methods Based on the software and hardware platforms of No.1 Military Medical Project, it was developed under Powerbuilder 9.0 without more tables and database expenses. Result Paperless prescription was realized. Conclusion The clinician's workload is reduced. Inaccurate patient expenses and drugs data are stopped.

Objective The aim of the current study was to investigate the prognostic value of extracapsular lymph node spread in gastric cancer patients and to find correlations with clinicopathological parameters.Methods Clinicopathological data of 131 gastric cancer patients who underwent gastrectomy with lymphadenectomy were analyzed retrospectively. The number of metastatic lymph nodes with extracapsular spread were determined. Multivariate analysis was performed to find the clinical prognosis affecting extracapsular lymph node involvement. Results Seventy-eight patients (59.5%)had perigastric lymph node metastasis. Fortysix cases were detected extracapsular lymph node involvement. The 5-year cumulative survival rate for patients with extracapsular lymph node spread was 13. 5% , while 32 patients with lymph node metastasis but without extracapsular involvement had a 5-year survival rate of 39.3%. The survival rate decreased significantly with the increase of extracapsular lymph node involvement(P =0.001). Extracapsular lymph node involvement was significantly associated with the higher number of metastatic lymph nodes, the location of lymph node metastasis, tumor invasion depth and distant lymph node metastasis. In the multivariate analysis, extracapsular lymph node spread also remained as an independent prognostic factor(P =0.003). Conclusions Extracapsular lymph node involvement is a convenient and reliable prognostic index, and is an independent prognostic factor in gastric cancer patients. In future staging systems for gastric cancer, extracapsular lymph node involvement should be considered, be pathologically checked and reported in order to determine extracapsular spread status.