Objective To investigate the distribution of water fluoride and the present status of water-improving defuoridation projects in the endmie fluorosis areas in Gansu Province in 2006. Methods The content of fluoride in drinking water in 18 endemic disease counties was screened, and the defluoridation projects built after the 1980s were supervised and inspected. The content of fluoride in drinking water was assessed by F-ion selective electrode. Results Fluoride content was determined in water of 6260 sources in 1252 fluorosis villages in 18 counties, with 63.50% (3975/6260)≤1.0 mg/L and 36.50%(2285/6260)>1.0 mg/L. Nine hundred and ninty-seven water-improving and clefluoridation projects had been investigated in 16 counties, among which 95.49% (952/997) were function well, and projects intermittently running or abandoned respectively accounted for 3.11% (31/997) and 1.40%(14/997). Nine hundred and eighty-three sources of water treated by the water-improving and defluoridation projects had been determined for fluoride content, it turned out that 91.76% (902/983) were within the standard, only 8.24% (81/983) were not; as for outlet and leftover water of 934 water-improving and defluoridatian projects determined for water fluoride content, qualified projects accounted for 92.08% (860/934) and 91.97%(859/934), leaving 7.92%(74/934) and 8.03%(75/934) disqualified, respectively. Water-improving and defluoridation projects mostly relied on drilling a well in gaining under-ground water or collecting surface-ground water, so under-ground water and surface-ground water are the majority. Conclusions Water fluoride content exceeds the standard in some of the villages. A few projects do not function well. Fluorosis damage still exists in Gansu Province, therefore countermeasures for endemic fluorosis must be carried out as promptly as possible and surveillance on water-improving and defluoridation projects must be strengthened and managed.

Background With the changes of diet and living style,the diabetes has become the major diseases affecting human health.Diabetic cataract is a common complication of diabetes. Objective The present study was to investigate the difference of lens proteomics between diabetic cataract and age related cataract using two dimensional electrophoresis (2-DE) and mass spectrometry in order to postpone happening of diabetic cataract and offer the effective approach to the prevention and therapy of diabetic cataract. Methods The lenses were obtained from 8 diabetic patients and 12 age-related cataract patients during the surgery to extract the protein by lysis and centrifugation.The lens proteins were separated using immobilized pH gradients 2-DE.Image analysis was carried out using PDQuest Advanced-8.0.1 software package.Significant difference of the crystallines was identified by matrixassisted laser adsorption/ionization time of-flight-mass spectrometry (MALDI-TOF-MS) and peptide mass fingerprint combined with protein database. Results The maps of 2-DE showed that lens proteins of diabetic cataract and age related cataract were in the section of pH 5-9 with the relative molecular weight 14000-97000;while relative molecular weight of more abundant crystalline was localized at 20000-31000.About 3 differential protein spots were detected by image analysis software.Two crystallines,αB and βB1 crystallin,were identified using MALDI-TOF-MS.Conclusions Proteomic analysis of lens can be accomplished and the proteins can be well separated,moreover,differential proteins can be analyzed using 2-DE and mass spectrometry between diabetic cataract and age related cataract.These results indicate that αB and βB1 crystallin proteins accelerate the development of diabetic cataract.This technique offers a new avenue for clarity of lens proteins of diabetic cataract other than age related cataract.

AIM: To identify the novel nuclear export signal by analyzing the DNA sequences and detecting the cell localization of different adenovirus ElA - associated protein BS69 isoforms. METHODS:BS69 DNA sequences in Emsebl database were blasted and the sequence of amino acids was aligned with the typical nuclear export signal. Different BS69 isoform fragments were cloned into pcDNA3.1 vector and transfected into Cos7 cells. The BS69 localization was observed by immunostaining and the function was verified by Western blotting. RESULTS: A novel nuclear export signal was found in BS69 isoform 2 but not in isoform 1.The isoform 2 was localized in cytoplasm and isoform 1 in nucleus, which was also consistent with the DNA sequence. The isoform 2 was involved in LMP1 - activated JNK phosphorylation whereas the isoform 1 was not. CONCLUSION: Different BS69 isoforms have different cellular localization. BS69 isoform 2 is localized in cytoplasm, interacting with Epstein - Barr virus latent membrane protein 1 and may be involved in nasopharyngeal carcinoma development.However, the isoform 1 is localized in nucleus and plays important roles in transcription.

Objective To obtain highly expressing cell lines by inserting the glutamine synthetase (GS) screening system and replacing the promoter of the vector.Methods The mutation of the point BamHⅠwas induced to build a new vector pIRES2-EGFP.The marker gene GS was inserted by AseⅠ and NheⅠ, and the promoter hCMV was replaced by PacⅠand NheⅠ.The new vector pHGS1.0 and the vector pIRES2-enhanced screen fluorescein protein( EGFP)-B were inserted by the recombinant protein TEM8 ( 1-227 )-VEGFR1 domain2-IgG2 ( TV-IgG2 ) gene to analyze the advantages of the expression.Results The glutamine synsthetase is successfully inserted, the human cytomegalovirus replaced, and recombinant protein is increased 5-fold by human immunoglobulin quantification kit.Conclusion The GS system is a highly protein expressing system.

Objective To construct an expression plasmid carrying the specific siRNA of survivin gene,and to evaluate its silencing effect on the expression of survivin gene and its inhibition effect on the growth of gastric cancer cells.Methods The specific siRNA of survivin gene was designed and synthesized,and an expression plasmid pAdGFP-siRNA was constructed.Gastric cancer cell line SGC-7901 was cuhured and transferred with pAdGFP-siRNA,then the silencing of survivin gene expression and the growth inhibition of cancer cell mediated by pAdGFP-siRNA were identified.Results The growth of gastric cancer cells was inhibited after transferring the pAdGFP-siRNA,with the inhibition rate of 68.2% compared to the control group.Immunohistochemistry showed that the specific siRNA markedly silenced the expression of survivin gene in cancer cells.Conclusions The overexpression of survivin gene in gastric cancer cells results in the high proliferation and the resistance to the chemo- and radio-therapy of the cancer cells.The specific siRNA can markedly silence the expression of survivin gene and inhibit the growth of cancer cells.

AIM To establish an HPLC-ELSD method for the simultaneous content determination of gastrodin,parishin A,parishin B,ginsenosides Rg1,Re,Rf,Rb1 and Rd in Tiantai No.1 Tablets (Ginseng Radix et Rhizoma,Gastrodiae Rhizoma,Cistanches Herba,etc.).METHODS The analysis of methanol extract of this drug was performed on a 45 ℃C thermostatic Alltima C1scolumn (4.6 mm × 250 mm,5 μm),with the mobile phase comprising of acetonitrie-0.1％ phosphoric acid flowing at 1.0 mL/min in a gradient elution manner.RESULTS Eight constituents showed good linear relationships within their own ranges (r ＞ 0.999 0),whose average recoveries were 96.94％-97.93％ with the RSDs of 1.06％-2.48％.CONCLUSION This simple,accurate and reliable method can be used for the quality control of Tiantai No.1 Tablets.

OBJECTIVEThe research aimed at studying the biological characteristics of rhizobia isolated from Abrus cantoniensis.

METHODThe rhizobia strains, isolated from different environments in Guangxi, were studied for their growing characters and the generation time. They were also compared for survival capabilities under stresses caused by NaCl, pH, temperature, and different kinds and concentration of antibiotics.

RESULTThe strains obtained from A. cantoniensis in subtropical zone produced alkali in YMA medium, the average generation time was 14.8 hours, and thus they belong to slow-growing rhizobia. Rhizobia strains differed greatly in respect to tolerance of high temperature, adaptability of acidic environment and sensitivity to four antibiotics, but they had the same abilities of using different carbon and nitrogen sources. After 70 days from inoculated strains, the seedling formed nodules on the root (85.0%), and the dry matter of vine was increased by 51.1%.

CONCLUSIONThe rhizobia strains isolated from different ecological environments are good germplasm resources of tolerances to high temperature and acidic environment. The research will greatly help utilize the rhizobia resources and enhance the quality of crude drugs of medicinal leguminosae.

Abrus ; microbiology ; Anti-Bacterial Agents ; pharmacology ; Culture Media ; Hydrogen-Ion Concentration ; Nitrogen Fixation ; Plants, Medicinal ; microbiology ; Rhizobium ; drug effects ; growth & development ; isolation & purification ; Temperature

The finite element method (FEM) is a mathematical technique using modern computer technology for stress analysis, and has been gradually used in simulating human body structures in the biomechanical field, especially more widely used in the research of thoracolumbar spine traumatology. This paper reviews the establishment of the thoracolumbar spine FEM, the verification of the FEM, and the thoracolumbar spine FEM research status in different fields, and discusses its prospects and values in forensic thoracolumbar traumatology.
Biomechanical Phenomena ; Computer Simulation ; Finite Element Analysis ; Humans ; Lumbar Vertebrae/injuries* ; Models, Theoretical ; Stress, Mechanical ; Thoracic Vertebrae/injuries* ; Traumatology

BACKGROUND: Nonunion is a common clinical complication in orthopedics, which seriously impacts the physical and mental health and quality of life of patients. In recent years, a large number of studies have found that icariin plays a significant role in promoting fracture healing and treating bone defects. Bone nonunion and fracture healing coexist, and the research on the mechanism of fracture healing actually focuses on the treatment of bone nonunion. OBJECTIVE: To review the research progress in the molecular mechanism of icariin in the treatment of bone nonunion. METHODS: The first author used “icariin, bone nonunion, bone marrow mesenchymal stem cells, periosteal cell, osteoblasts, osteoclast” as key words in English and Chinese to search PubMed, CNKI, WanFang and VIP databases. A total of 542 articles were retrieved and screened manually according to the selection criteria and exclusion criteria. Finally, 44 articles were included for result analysis. RESULTS AND CONCLUSION: Icariin can effectively promote fracture healing and treat bone nonunion by promoting the proliferation and differentiation of bone marrow mesenchymal stem cells and periosteal cells, promoting the proliferation and maturation of osteoblasts and inhibiting the osteoclast effect of osteoclasts. However, most of the experiments are still in the basic experimental research, and there is still a need for a large number of clinical studies as well as studies on related proteins and genes, to provide a new idea for the clinical use of Chinese herbs in the treatment of bone nonunion.