Objective To establish a sensitive, reliable and simple method for determination of selenium(Se) in salt. Methods The salt samples were dissolved in water and added hydrochloric acid, thiourea, placed for 30 minutes under the room temperature, then used HG-AFS to determine Se. Results The linear range was 0.5-20 ?g/L, the detection limit was 0.06 ?g/L, RSD

Objective The present paper makes attempt to study the enrichment features of mercury in freshwater fishes and to evaluate the mercury contamination in environment with the fishes.Methods The fish samples of silver carp,common carp,johnny carp,shorthead catfish and catfish were collected from Songhua River and Heilongjiang River.The content of mercury in freshwater fishes,water and sediment was determined,the biological characteristic of mercury contamination in aquatic animal and the applicability of mercury contamination in aquatic amimal and its estimation were analyzed in Sep.,2007.Results The levels of mercury in river water and sediment were 0.053 ?g/L and 0.27 mg/kg for samples collected from Jiamusi section of Songhua River,and 0.034 ?g/L and 0.16 mg/kg for samples collected from Fuyuan section of Heilongjiang River.The concentrations of total mercury in the muscles of Songhua River’s silver carp,common carp,johnny carp,shorthead catfish and catfish was(0.070 ? 0.036),(0.120?0.071),(0.113?0.067),(0.152?0.107) and(0.196?0.095) mg/kg respectively.The concentrations of total mercury in the muscles of Heilongjiang River ’s silver carp,common carp,johnny carp,shorthead catfish and catfish was(0.042 ? 0.034),(0.103?0.077),(0.095?0.072),(0.157?0.118),(0.174?0.101) mg/kg respectively.The mercury content in fish in the same water environment was significantly positive correlated with its weight(P

Objective To explore the cultivated methods of dendritic cells (DC) and the killing effect of DC stimulated by CpG ODN1826 on gastritic cancer cells MKN45 in vitro. Methods DC was induced from peripheral blood monocytes stimulated by A group ( GM- CSF + IL-4 ), B group ( GM- CSF + IL-4 + TNF- α), C group(nonCpG ODN) and D group( CpG ODN 1826). The surface markers of DC was analyzed via flow cytometry, and the abilities to stimulate proliferation of allogenic lymphocyte by DC and antitumor experiment were detected by MTT assay. Results On day 10, a majority of cells showed typical morphology of DC in D group and B group with visible branching-like and pseudopod-like structures under microscope. The results of flow cytometry showed that there are significantly high expressed co-stimulated molecules such as CD40, CD1a,CD80, CD86 and MHC- Ⅱ in D group compared to other experimental groups ( P ＜ 0.05 ), which dramatically stimulate the proliferation of allogenic lymphocytes and enhance the killing activity of DC on gastric cancer cells. Conclusion This method can acquire relatively high purified DC, and CpG ODN can significantly induce the differentiation and maturation of DC isolated from peripheral blood and enhance the killing activity of DC on MKN45 by stimulating PBMC in vitro.

Objective To study the diagnosis and treatment of hepatic hemangioma. Methods (Retrospective) analysis was made on the clinical data of 50 patients with hepatic hemangioma in our hospital from January 1998 to January 2003. Results The accuracy diagnotic rate of ultrasound, CT, MRI were 90%(45/50), 97.6%(40/41), 100%(5/5) respectively.The correct diagnostic rate was 96.0% in this series. The operative indications were symptomatic hemangioma, diameter of tumor larger than 4.0 cm, or tumor with uncertain diagnosis. The operations performed were as follows:Laparoscopic(enucleation) of hemangioma in one cases. 3 patients treated by transcatheter arterial embolization, and(thirty-nine) patients underwent surgical(excision).No death occurred in this series. Four(10.3%, 4/39) had postoperative complications. (Conclusions) Hepatic hemangioma can usually be correctly diagnosed.Ultrasound, CT and MRI are the main(diagnostic) methods for the diagnosis of hepatic hemangioma.For patients with hepatic hemangioma that is(symptomatic), increasing in size,or of uncertain diagnosis, surgical treatment is safe and effective. Laparoscopic(enucleation) of hemangioma can be performed in selected cases.

Objective To summarize the experience on diagnosis and treatment of splenic neoplasm. Methods Clinical data of 40 patients with primary splenic space occupying lesion treated in our hospital were retrospectively analyzed. Results Thirty four out of the 40 cases were diagnosed as primary splenic neoplasm preoperatively. The detectable rate of B-US was 94%, and that of CT was 96%. The discrimination rate of benignancy and malignancy by CT was 84%. Serum AKP and ?-GT were significanfiy increased in most of the malignancies. Seventeen among 22 cases with benignancy were treated by splenectomy, and the others underwent partial splenectomy or tumor resection. Sixteen of 18 patients with malignancy underwent splenectomy, and two did biopsy. Pathology revealed cysts in 13, angiocavernoma in 4, inflammatory pseudotumor in 3, caverous lymphangioma in 1, and cystic degeneration of liomyoma in 1; malignant lymphoma and lymphsarcoma in 9, hemangiosarcoma in 3, and fibrosarcoma, liomyosarcoma, malignant fibrous histiocytoma in 1 each. Three cases with malignancy have survived more than 5 years. Conclusions Splenic neoplasm is diagnosed mainly according to clinical manifestation and image examination. The discrimination of benignancy and malignancy depends on CT, angiography, and serous AKP and ?-GT level. Radical operation and complex treatment could improve the prognosis of splenic malignant tumor.

BACKGROUND: Silver-matrix composite is usually used as a kind of electrical conductive matedal, which has excellent properties in electrical and heat conducting. MoS2, which used as a common solid lubricating material, has unique anti-frictional and lubricating properties in the process of wearing. Ag-MoS2 composites using in the area of electrical sliding wear were fabricated by adding MoS2 to the silver-matrix. OBJECTIVE: Ag-MoS2 composites with different content of MoS2 were produced to gain the mixture ratio for best properties by the experiments of mechanical and wear test. DESIGN, TIME AND SETTING: The controlled experiment was performed at the Department of Matedal Science and Engineering, Hefei University of Technology from April to May 2008. MATERIALS: Silver powder (Bengbu Gold and Silver Article Factory, China) and MoS2 powder (Sinopharm Chemical Reagent Co., Ltd., China) were used in this study. METHODS: Ag-MoS2 composites for five different contents were fabricated by powder metallurgy method, which included the processes of powder mixture, drying, initial pressure, sintering, and second pressure. MoS2 contents were the MoS2 composite of 12.0%, 13.5%, 15.0%, 16.5%, 18.0% silver- MoS2. MAIN OUTCOME MEASURES: Flexural strength was measured by versatility mechanical testing machine. The microstructures of the composites after sintering were observed by an optical microscope. The electrical sliding friction and wear properties were tested by the electrical wear test machine. The worn surfaces of the samples were observed by a scanning electron microscope. RESULTS: With the increase in MoS2, the flexural strength decreased, the resistivity increased, and the wear loss decreased first, and then increased, which comes the lowest point when the MoS2 content was 15%. CONCLUSION: When the content of MoS2 is 15%, the average properties was the best.

Objective:To explore the clinical application value of group A Streptococcus (GAS) antigen rapid detection method in children suffering from GAS infection.Methods:A total of 44 733 children with suspected GAS infection who were admitted to the Outpatient and Inpatient Departments of Shenzhen Children′s Hospital from January 2015 to December 2019.Throat swab specimens from all children were collected, and BinaxNOW Strep A Test reagent was used for GAS antigen rapid detection.Among them, the throat swabs of 346 children were inoculated with blood culture medium for traditional bacterial culture, and then the GAS antigen rapid detection was tested.The sensitivity and specificity of the two methods were compared, and according to the result of the GAS antigen rapid detection, its age, gender and seasonal trends were analyzed.SPSS 19.0 software was applied for statistical analysis of the data.Results:Among the 346 children tested by both methods, the results of bacterial culture were adopted as the reference method, the sensitivity of the rapid detection method for GAS antigen was 89.41%(152/170 cases), and the specificity was 94.32%(166/176 cases) compared with culture methods.A total of 44 733 cases GAS antigen were tested in children in Shenzhen, of which 10 024 cases were positive, with the positive detection rate of 22.41%.The trend of GAS antigen rapid detection was consistent with the five-year trend, with the high positive rate of 3-8 years, of which 4-6 years of positive rate was the highest.The two seasonal peaks were evident each year, with peaks occurring in April-June, and November and January of next year.The detection rate ratio of male and female was 1.74∶1, and the gender difference was significant ( χ2=27.93, P<0.000 1). GAS antigen rapid detection rate in different clinical departments from high to low in order are as follows: dermatology outpatient (52.34%), emergency clinic (47.74%), internal medicine outpatient (37.36%), infectious disease area (19.71%), five-level disease area (10.27%), internal medicine area (8.63%), surgical areas (7.34%) and neonatal areas (0). Conclusions:GAS antigen rapid detection method and bacterial culture method have high coincidence rate, and high sensitivity and specificity, and can be popularized and applied in the diagnosis of GAS infectious diseases in children.GAS detection rate is higher in outpatient emergency department and dermatology clinics.There are obvious differences from seasonal and population (age and gender) in the positive detection of GAS antigen.No neonates were found.

Objective To investigate and compare the level of food specific IgG antibody between children with chronic diarrhea and healthy children,analyze the correlation between chronic persistent diarrhea and food intolerance.Methods The research objective of 105 cases was obtained from in-patient children in Shenzhen children′s hospital diagnosed as chronic persistent diarrhea and 94 cases diagnosed not diarrhea as control group in the year of 2015.The level of fourteen food allergen specific IgG in serum was detected using enzyme-linked immunosorbent (ELISA) in 199 cases.Results Chronic persistent diarrhea was more observed in 0-1 years old of infants.The positive rate of 14 food allergen specific IgG in 105 cases of children with chronic persistent diarrhea in turn from high to low was milk,eggs,tomatoes,rice,wheat,cod,corn,beef,soybeans,chicken,pork,mushrooms,shrimp and crab;14 food allergen specific IgG in 94 cases of children not with diarrhea in turn from high to low was arranged as follows:milk,eggs,tomatoes,rice,wheat,soybeans,cod,corn,beef,crab,chicken,mushroom,shrimp and pork.Among them the level of milk,beef and soybeans in the comparison of the two groups was significantly different(P<0.05).Conclusion Food intolerance was one of the important factors caused chronic persistent diarrhea in children.Reasonable diet for children may be the effective treatment of chronic persistent diarrhea.

Objective:To summarize our experience in 13 cases of intestinal autotransplantation (IATx) after resection of lesions involving the roots of mesenteric vessels.Methods:The clinical data of 13 patients undergoing IATx in Xijing hospital were retrospectively analyzed. The etiology, surgical procedure and complications were analyzed. The patients were followed up by telephone and regular evaluations.Results:All 13 cases of IATx were successfully completed. For 12 patients who were diagnosed with tumors involving the mesenteric roots, the tumors were removed for cure intent avoiding massive intestinal resection. Pancreaticoduodenectomy was carried out simultaneously in 11 cases. The postoperative complication rate was 85% (11/13). The autograft was resected in 1 patient on the 1st postoperative day due to necrosis from mesenteric thrombosis, leading to short bowel syndrome. One-year survival was 69% (9/13). Among 4 deaths, 1 patient died of liver metastasis, and another died of liver and lung metastases. Five patients were alive 2 years postoperatively.Conclusion:IATx while-technically challenging, avoiding short small bowel syndrome in properly selected patients after resection of lesions especially benign ones involving the roots of mesenteric vessels that were traditionally considered to be "unresectable".

The process of axonal injury after ischemic stroke can be roughly divided into three stages. Each stage has its different temporal and spatial pattern, as well as unique molecular cascade reactions. The process of axonal injury is also related to ischemic stroke subtype, and the treatment must be adjusted accordingly. Axon-glial intercellular neurotransmitter-energy metabolism coupling disorder and Ca2 + overload-mediated apoptosis-like degeneration are the main mechanisms of early axonal injury after stroke. Axonal regeneration and remyelination of damaged axons after stroke play an important role for the recovery of neurological function. Elucidating the axonal injury and repair mechanism after stroke can provide a new strategy for stroke treatment.