A new approach, combining microwave digestion and sensitive determination of selenium by a normal-phase high performance liquid chromatography after derivatization with 2,3-diamino-naphthalene was proposed to the measurements of trace selenium concentration in natural waters. Two digestions systems, I.e. HNO3 and H2SO4-H2O2, were evaluated and their working conditions were optimized. Under optimal conditions, this approach provides a detection limit of 7.2 pg (with HNO3） or 10.4 pg (with H2SO4-H2O2）, a recovery of 99.1%～103.4%, as well as a linear range of 0～1.5 ng Se(Ⅳ). The approach was applied to determine Se concentration in 4 different types of environmental waters (sample volume: 2 mL) and the concentration levels of 0.20～0．90　μg/L were found, with recoveries of 99.1%～103．4% by standard addition.

Objective To evaluate the effects of two different chronic glaucoma models on intraocular pressure elevation and retinal structure changes in rat.Methods Two different chronic ocular hypertension (COH) models were made by three episcleral vein cauterization or latex microspheres injection into anterior chamber,6 cases of each model.IOP measurements of right eyes (COH eye) and left eye (control eye) were taken weekly by TonoPen (an applanation tonometer).Retinal ganglion cells (RGCs) were retrogradely labeled with 1,1'-dioctadecyl-3,3,3',3'-tetramethylindocarbocyanine perchlorate (DiI) seven weeks later.Retina structure was observed by immunofluorescence.Results IOP was elevated at postoperative 1-8 weeks,and the mean IOP in the episcleral vein cauterization group was (27.20 ± 1.83) mmHg (1 kPa =7.5 mmHg),whereas the control group was (19.80 ± 1.35) mmHg (P =0.001,n =6).The mean IOP in the latex microspheres injection group was (27.40 ± 1.88) mmHg,whereas the control group was (19.40 ± 1.00) mmHg (P =0.000,n =6).Compared with control rat at postoperative 8 weeks,RGCs loss in episcleral vein cauterization group were 37.9％,39.6 and 33.5％ (all P =0.000,n =6),latex microspheres injection group were 37.3％,39.4％ and 33.5％ (all P =0.000,n =6).There was no statistical difference between episcleral vein cauterization group and latex microspheres injection group (P =0.855,0.949,0.634,n =6).Compared with control rat at postoperative 8 weeks,GCL thickness in both COH models were also significant reduced,but there was no statistical difference in GCL thickness among control group (7.32 ± 0.39) μm,episcleral vein cauterization group (4.97 ±0.33) μm,latex microspheres injection group (5.00 ±0.31) μm.Misoperation or careless operation may lead to microspheres particle residual on flat-mounted rat retina.Conclusion The episcleral vein cauterization or latex microspheres injection into anterior chamber can all increase the IOP.However,there are some advantages in episcleral vein cauterization such as few costs than latex microspheres injection and no microsphere contamination.

Objective To compare the effects of mild moxibustion at different frequencies on sub-health state, and to discuss the effectiveness and dose-response relationship of moxibustion in treating sub-health state. Method Totally 108 subjects were divided by using random number table into group Ⅰ (36 cases), group Ⅱ (36 cases) and group Ⅲ (36 cases). Same acupoints were selected for the three groups, including Guanyuan (CV3), bilateral Zusanli (ST36), and bilateral Sanyinjiao (SP6). A moxa stick was ignited at one end to treat the corresponding points, 3-4 cm away from the skin, making the topical area hot but without burning pain. Each point was treated for 10 min, till the skin flushed. The 3 groups were respectively treated once a day, once every other day, and once a week, 1 month as a treatment course, totally for 2 courses. The Sub-health Symptoms Scale, immunoglobulins IgA, IgM and IgG, and superoxide dismutase (SOD) were evaluated and statistically analyzed before and after intervention. Result The total effective rate was 87.9% in group Ⅰ, 84.8% in group Ⅱ, and 34.3% in group Ⅲ. The paired comparisons showed that there was no significant difference between group Ⅰ and Ⅱ (P>0.05), while group Ⅰ and group Ⅱ were both significantly different from group Ⅲ (P<0.05). After intervention, the levels of IgA, IgM, IgG, and SOD were significantly increased in group Ⅰ and Ⅱ (P<0.05), but the increases in group Ⅲ were statistically insignificant (P>0.05). Conclusion The therapeutic efficacy of mild moxibustion for sub-health is related to the treatment frequency, and frequencies at once a day and once every other day both can produce significant efficacies, which are superior to that of moxibustion at once a week.

To investigate the effects of electroacupuncture (EA) at Neiguan (PC6) and Xinshu (BL15) on the nerve electrical activity in spinal dorsal root and norepinephrine (NE) and dopamine (DA) concentrations in the paraventricular nucleus of the hypothalamus in rats with acute myocardial ischemia (AMI).

Objective To investigate the influence of silencing Med19 on metastasis and invasion of human breast cancer MCF-7 cells. Methods lentivirus expression vector delivering small hairpin RNA (shRNA) against Med19 gene was constructed, then transfected of human breast cancer MCF-7 cell line. There were three experimental groups: non-infected (CON) group, Lv-NC-infected (NC) group, and Lv-shMed19-infected (KD) group. To determine the lentiviral infection efficiency, expression of GFP was detected with fluorescence microscopy. The mRNA and protein levels of Med19 in three groups MCF-7 cells were detected by real-time PCR and Western blotting. Scratching and transwell tests were employed to determine the ability of metastasis and invasion of cells. Results The highest infection efficiency was obtained, resulting fluorescent expression identified in more than 90%of MCF-7 cells 120 h after infection. The expression of Med19 mRNA in the KD group was dramatically decreased by 72.3%compared with the NC group, and by 72.1% compared with the CON group, respectively (P < 0.05). The Med19 protein expression in the KD group was significantly lower than that of the NC group and the CON group, with a reduction of 85.4%and 85.3%, respectively (P<0.05). No statistical significance was detected between the NC groups and the CON groups. Thus, the constructed Lv-shMed19 was demonstrated to be active and specific in inhibiting the expression of Med19. Moreover, the invasive distances of KD group, NC group and CON group MCF-7 cells were compared at 6 hour, 12 hour and 24 hour. The invasive ability of MCF-7 cells decreased significantly with the extension of time (P<0.05). The cells passed through polycarbonate membrane in KD group, NC group and CON group were 23.8 ± 4.32, 43.4 ± 3.65 and 45.8 ± 5.81 respectively. The metastatic ability of KD group was significant reduced (P<0.05). Conclusion Silencing of Med19 gene significantly decreases the ability of metastasis and invasion of human breast cancer MCF-7 cells, and then suppresses the malignant biological behavior of breast cancer.

Objective To investigate the impact of leukocyte-removed priming fluid on plasma inflammatory factors TNF-?,IL-6,IL-8,NE peri-CPB in infants.Methods Selected 60 infants,of less than 1-year-old,with ventricular septal defect(VSD)were randomly assigned to the experimental group and the control group.The experimental group took blood leukocyte-removed priming fluid,and the control group took banked blood-derived priming fluid.The plasma TNF-?,IL-6,IL-8,NE concentrations were determinated by using ELISA at the corresponding period of cardiopulmonary bypass(before CPB,aortic cross-clamping 10 min,aortic open 10 min,2h,6h,12h,24h and 48 h after the end of CPB).Results TNF-?,IL-6,IL-8,NE concentrations increased significantly after the start of CPB(P

Objective To analyze the clinical effects of internal radiation of iodine-125 seed implantation in the treatment of advanced pancreatic carcinoma.Methods 22 patients with unresectable and advanced pancreatic carcinoma were treated by the internal and interstitial radiation using iodine-125 seed implantation.Results Survival of 20 months was observed in 5 patients,10 ～ 20 months in 9 patients,2 ～10 months in 8,patients with an average of (13.47 ± 8.12) months.Among the 22 patients,complete response was obtained in 5 patients,partial response in 8 patients,no response in 7 paticnts,and the other showing PD.The response rate( CR + PR) was 59％.Conclusions Intra - operative internal radiation by iodine - 125 seed implantation does show some therapeutic effects for advanced pancreatic carcinoma.

Stilbene glycoside (TSG) has been shown to have many beneficial properties. It is therefore essential to understand the absorption and metabolism of TSG in detail. We determined the recovery of TSG and its metabolites (TSG sulfate/glucuronides) in rat gastric contents, gastric mucosa, portal vein plasma, celiac arterial plasma, bile, and urine after administration of 15mg of TSG in 0.5mL physiological saline or incubation for 20min in situ in the stomach of rats. Within 20min, (64.0±9.8)% of the administered TSG disappeared from the stomach; later, TSG was recovered in both free and conjugated forms in plasma and bile, but not in urine. On the other hand, only free TSG was detected in the gastric contents and mucosa; it was also detected in the portal vein plasma as (48.1±3.5)% of the total TSG (all forms of TSG). However, the proportion of free TSG in the celiac arterial plasma and bile decreased to 4%-10%. In addition, the proportion of free TSG to total TSG in the liver microsome incubation mixture after TSG was incubated in liver microsome at 37℃ for 30min was very low [(10.6 ± 2.6)%]. These results indicate that TSG could be quickly absorbed from the rat stomach, conjugated in liver and excreted in bile. Such novel information would be helpful for the use of TSG as a beneficial natural product which may improve its proposed efficacy in preventing chronic diseases.

Objective To provide reference for effective scientific literature novelty assessment by investigating its recognition in medical and health staff of a military area command and their use of information resources and need of information .Methods Knowledge of scientific literature novelty assessment , satisfaction of scientific literature novelty assessment report, need and use of information resources were investigated in 149 staff of 9 hospitals with self-de-signed questionnaire .Results The general recognition and satisfaction levels of scientific literature novelty assess-ment were good in medical and health staff of a military area command .However , the information resources were insufficiently used , which was related with the scientific research level and scientific literature novelty assessment popularization .Conclusion Scientific literature novelty assessment should be popularized , staff engaged in scientific literature novelty assessment should be trained, sharing of information resources should be strengthened , and infor-mation service should be expanded and deepened in military area commands.

Objective To study the significance of CD24 protein expression in esophageal squamous cell carcinoma and its relationship with clinical pathological parameters and clinical prognosis.Methods The expression of CD24 protein was studied in 90 esophageal squamous cell carcinoma samples by EnVision immunohistochemical analysis and to study relationship of CD24 with clinical pathological parameters and prognosis.Results The expression of CD24 in esophageal squamous cell carcinoma was significantly higher than that in adjacent normal tissue (x 2 =0.832,P ＜ 0.05).The expression of CD24 was not related with the age of patien,sexuality and the histologic grade (x2 =0.741,0.361,0.930,8.858,all P ＞ 0.05),but with clinical stage of the cance (x2 =10.804,P =0.005),lymph node metastasis (x2 =12.349,P =0.000) and depth of tumor invasion (x2 =13.94,P =0.007).Significant difference in survival between the different CD24 expression group,the OR (95 ％ CI) values were 2.105 (61.022-69.273),2.313 (55.108-64.176),1.286 (32.388-37.429),the survival of patients with strong expression of CD24 was inferior to that of weak expression of CD24,depth of tumor invasion and lymph node metastasis were independent prognostic factors of esophageal squamous cell carcinoma.Conclusion CD24 may be related to the malignant process of esophageal squamous cell carcinoma.Overexpression of CD24 indicates poor prognosis in esophageal squamous cell carcinoma patients.CD24 may become a new independent prognostic factor for esophageal squamous cell carcinoma.