Objective To establish a capillary gas chromatography method for the determination of trinitrotoluene (TNT) in workplace air.Methods Using dichloromethane as the eluent,the air was drawn through a glass fiber filter to collect TNT,TNT was extracted from the filter with dichloromethane by an ultrasonic shaker,and the sample was analyzed by OV-17 elastic quartz electron capture detector capillary gas chromatography.Results Under the optimal condition,the lowest detection limit was 0.006 ?g/ml,the lowest detection concentration was 0.001 3 mg/m~3 (based on 45 L air sample).When the concentration of standard solution was 0.040-2.0 ?g/ml,the linear equation was good,r=0.999 8,RSDs were between 0.66%-3.62%,the recovery rates were 90.4%-95.5%.When sample was collected by fiberglass filter paper,the efficiency of desorption was more than 90%,and was stable for at least 7 days at 2℃-8℃.Conclusion This method is applicable to the determination of trinitrotoluene in workplace air.

BACKGROUND:Epidural scar after laminectomy is one important reason for the secondary spinal stenosis, and local application ofSanqi sodium hyaluronate gel can prevent epidural scar adhesion after laminectomy. OBJECTIVE: To study the effects ofSanqisodium hyaluronate gel on α-smooth muscle actin expression in the process of rabbit's epidural scar formation. METHODS: In this study, there were ninety-six rabbits which were randomized into four groups and given 0.5 mL normal saline, 0.5 mLSanqi concentrated solution, 0.5 mL sodium hyaluronate and 0.5 mLSanqisodium hyaluronate gel around the dura. At 1, 2, 4, 8 weeks after treatment, immunohistochemistry staining was employed for analysis of α-smooth muscle actin expression. RESULTS AND CONCLUSION:At the end of weeks 1 and 2, the expression of α-smooth muscle actin antibody in the normal saline group was significantly higher than that in the other three groups (P < 0.01 orP < 0.05), but there were no significant differences among the Sanqi, sodium hyaluronate andSanqisodium hyaluronate gel groups (P> 0.05). At weeks 4 and 8, the expression of α-smooth muscle actin antibody in theSanqi sodium hyaluronate gel group was significantly lower than that in the other three groups (P < 0.01 orP < 0.05), and there was no significant difference among the latter three groups (P > 0.05). These findings suggest thatSanqi sodium hyaluronate gel can inhibit the expression of α-smooth muscle actin, and thus ease scar contracture.

Objective To investigate the effect of family supporting system on psychological emotion and quality life of leukemic children′s parents. Methods Fifty-eight parents of children with leukemia hosptalized from Juanary to December 2013 were set as control group, which received traditional education. Fifty-nine parents of children with leukemia hospitalized from Juanary to December 2014 were set as observation group which received family supporting system. The survey was done separately before intervention and 6 months after treatment by depression self rating scale (SDS), anxiety self-assessment scale (SAS) and SF-36 (the MOS 36 items short form health survey). Result There were statistical significances in the scores on SDS, SAS and SF-36 as compared those with the pre-intervention (P<0.05). Conclusion The leukemic children parents supporting system can effectively reduce the parents′depression and anxiety and improve their quality of life.

Objective To investigate behavior,knowledge and attitude of cigarette smoking,and their relationship among different occupational population in Jiangsu Province.Methods Convenient sampling was used to interview 516 staff from medical institution,schools,government offices,public transportations and waiting rooms,restaurants and internet bars.The content of interview included current smoking,second-hand smoking,and related knowledge and attitude.Results Proportion of current smoking in male(51.2%)was higher than that in female(0.3%,P90%),while it's relatively lower in "second-hand smoking and exact related diseases"(

In this paper, Gaussian pixelate Chinese character processing software is designed, and HMD is used to realize the recognition experiment for pixelate Chinese characters based on simulated prosthetic vision. The structure of recognition system, software design and the experiment for determining Gaussian width (sigma) are presented. It is shown that when sigma is 0.235, the recognition program is the best.
Equipment Design ; Image Processing, Computer-Assisted ; Language ; Prostheses and Implants ; Software Design ; Visual Perception

Une new flavonoids named as notabilisin K (1), together with four known compounds, morusin (2), mulberrofuran A (3), neocyclomorusin (4) and mornigrol F (5) are separated from 95% ethanol extracts of the twigs of Morus notabilis. Compounds 2-5 are separated from this plant for the first time. Notabilisin I, notabilisin J exhibits certain effect against cells of HCT-116, HepG2 and A2780 with IC50 values ranging from 1.47 μmol x L(-1) to 5.46 μmol x L(-1). Morusin exhibits strong effect against five kinds of human cancer cells (BGC823, A2780, HCT-116, HepG2 and NCI-H1650) with IC50 values ranging from 0.74 μmol x L(-1) to 1.58 μmol x L(-1).
Antineoplastic Agents, Phytogenic ; chemistry ; Benzofurans ; chemistry ; Flavonoids ; chemistry ; Hep G2 Cells ; Humans ; Inhibitory Concentration 50 ; Morus ; chemistry ; Plant Extracts ; chemistry ; Terpenes ; chemistry

Adult ; Antigens, CD ; metabolism ; Antigens, CD34 ; metabolism ; Antigens, Differentiation, Myelomonocytic ; metabolism ; Dermatofibrosarcoma ; metabolism ; pathology ; surgery ; Diagnosis, Differential ; Female ; Fibroma ; metabolism ; pathology ; Humans ; Lipoma ; pathology ; Neurofibroma ; metabolism ; pathology ; Receptors, Cell Surface ; metabolism ; Skin Neoplasms ; metabolism ; pathology ; surgery

Objective To evaluate the effect of standardized training and management of prenatal ultrasound screening on birth defects. Methods According to the degree of standardized training and management of prenatal ultrasound screening, the period from March 2004 to December 2009 were divided into three different management stages. Detection rate was applied to describe the prenatal ultrasound screening of 5199 birth defects cases delivered during the three different management stages. Accuracy rate was used to describe the ultrasonographic diagnosis made by staffs in 2009. SPSS 11.5 software was used to analyze the information of 707 staffs participated in the training and assessment activities from October 2007 to September 2009. Related factors of prenatal ultrasound operating skills of staffs were analyzed by comparing the distributing discrepancy of the different variables between qualified and unqualified group with Chi-square test. Results The detection rate of prenatal ultrasonographic screening on birth defects increased with the improvement of training and assessment methods, which was 32. 43% from March 2004 to September 2005,44.81% from October 2005 to September 2007 and 60. 71% from October 2007 to December 2009respectively. In 2009, 187 doctors were tested on abnormal ultrasound photographs identification. The accurate rates were 80. 0% for gastroschisis, 78. 8% for cleft clip, 75.8% for omphalocele, 71.8%for neural tube defects, 50. 0% for severe congenital heart diseases, 31.0% for acromicria, which were in similar sequence as the diagnostic rate identified by prenatal ultrasound in 2009. Among the staffs attending the prenatal ultrasound screening assessment, more had education background at least university level (52.8% vs 47.2%), more performed ≥50 ultrasound screenings per month (50. 5%vs 49.5 % ), more had been working on obstetric ultrasound over 3 yrs (52.5 % vs 47.5 %) and more had been trained in higher level of hospitals focused on prenatal diagnosis (64.7% vs 35.3%) in the qualified group than in the unqualified group. Conclusions Standardized training and management of prenatal ultrasonographic screening could effectively improve the diagnosis rate of birth defects.The quality of prenatal ultrasound screening is related to the staff's education background and whether they are engaged in the position.

Hot-melt extrusion was applied to prepare mesoporous silica/ethylcellulose mini-matrix for sustained release, and fenofibrate was used as a model drug, ethylcellulose and xanthan gum were chosen as sustained-release agent and releasing moderator, respectively. This novel matrix obtained the controlled release ability by combining mesoporous silica drug delivery system and hot-melt extrusion technology. And mesoporous silica particle (SBA-15) was chosen as drug carrier to increase the dissolution rate of fenofibrate in this martix. Scanning electron microscope, transmission electron microscope, small angle X-ray powder diffraction and N2 adsorption-desorption were introduced to determine the particle morphology, particle size and pore structure of the synthesized SBA-15. The results showed that SBA-15 had a very high Brunauer-Emmett-Teller specific surface area, a narrow pore size distribution, large pore volume and a ordered two-dimensional hexagonal structure of p6mm symmetry. Differential scanning calorimetry and X-ray powder diffraction results demonstrated that fenofibrate dispersed in an amorphous state inside the pores of the mesoporous silica which contributed to the improvement in the dissolution rate. The drug release of mini-matrices was influenced by ethylcellulose viscosity grades and xanthan gum concentration, which increased with the increasing of xanthan gum concentration and decreasing of ethylcellulose viscosity. Mini-matrix containing 22% xanthan gum exhibited a good sustained release performance, and the drug release behavior followed the first-order kinetics.

Objective: To explore the sensitization effects of resveratrol on CNE2 nasopharyngeal carcinoma cell line with hypoxia-induced chemotherapy resistance and the potential mechanism. Methods: Human CNE2 nasopharyngeal carcinoma cell line was cultured under hypoxic conditions (37 degrees centigrade, 5% CO(2), 2% O(2)) in vitro. The cultured cells were treated with different concentrations of resveratrol for 48 h. Reversal fold (RF) of reseratrol to chemotherapeutic drugs in CNE2 cells was measured by methyl thiazolyl tetrazolium (MTT) assay. Apoptotic rate of CNE2 cells was observed by flow cytometry. Reverse transcription-polymerase chain reaction (RT-PCR) method and Western blotting were used to investigate the expressions of multidrug resistance gene 1 (mdr1), multidrug resistance-associated protein 1 (MRP1) and hypoxia inducible factor 1alpha (HIF-1alpha) in CNE2 cells. Results: Resveratrol combined with chemotherapeutics produced a synergistic effect. The RF of 200 alphamol/L resveratrol to paclitaxel was 2.58. Combined with paclitaxel, 25, 50, 100 and 200 alphamol/L of resveratrol increased the apoptotic rate of CNE2 cells from (22.14+/-1.09)% to (23.24+/-1.37)%, (27.57+/-2.01)%, and (30.36+/-2.31)%, respectively. Resveratrol could down-regulate the expressions of HIF-1alpha, mdr1 and MRP1 significantly. After being treated with resveratrol at different concentrations separately, the expressions of HIF-1alpha, mdr1 and MRP1 in CNE2 cells decreased significantly as compared with paclitaxel alone or paclitaxel plus verapamil (P<0.01). Conclusion: Resveratrol can enhance the sensitivity of CNE2 cells to chemotherapeutic drugs under hypoxia. The potential mechanism is partly attributed to inhibiting the gene expressions of HIF-1alpha, mdr1 and MRP1.