Objective:To study the antibacterial properties of pure titanium treated with benzalkonium chloride solution.Meth-ods:10 mm ×10 mm ×1 mm titanium specimens were processed by the benzalkonium chloride solution at 1%,0.5% and 0.1%respectively followed by treatment in the cultured bacterial suspension,and then the antibacterial properties of the titanium plates were examined.Additionally,the thermal cycling test was carried out for the 1% benzalkonium chloride-treated titanium plates, and subsequently put the plates into cultured bacterial suspension,the duration of antibacterial properties was observed.Results:0.5% and 1% benzalkonium chloride solution-treated titanium plates significantly inhibited the growth of candida albicans(P <0. 05),1% solution was more effective than 0.5% solution.After 1 000 and 2 500 thermal cycling,the pure titanium still retained the antibacterial ability,but the plates treated by 5 000 cycling showed no antibacterial effect.Conclusion:A certain concentration of benzalkonium chloride can make the pure titanium obtain antibacterial properties.The treated plates may maintain the antibacte-rial properties for a minimum of 3 months.

Objective To explore the relation between endothelial function and Alzheimer′s disease(AD).Methods The concentration of asymmetric dimethylarginine(ADMA)and L-arginine were measured by high-performance liquid chromatography(HPLC),the concentration of nitric oxide(NO) detected by the method of nitrate reductase,and the activity of nitric oxide synthase(NOS)examined using NOS assay kits,in the plasma of 45 mild/moderate AD patients and 48 controls.Results Compared with controls,the concentration of ADMA(0.95?0.09?mol/L,P=0.00)was significantly increased,however the activity of NOS((13.9?3.9)U/L,P=0.00),inducible NOS(iNOS)((5.1?1.8)U/L,P= 0.00)and concentration of NO((41.7?5.0)?mol/L,P=0.00)were significantly decreased.In addition,Logistic regression analysis found significant positive correlations between the plasma concentration of NO and the score of the CDR(y=36.64?0.398_x;r=0.398,P

ObjectiveTo explore the relationships of driving coping styles with driving behaviors and road accidents of drivers.MethodsThree hundreds and thirty-seven drivers were randomly surveyed by Driving Coping Questionnaire ( DCQ),Driver Behavior Questionnaire (DBQ).Results ( 1 ) Except avoidance coping style,confrontive coping and emotion-focused coping were correlated positively with the three driving behaviors ( r =0.18 ～ 0.56,P ＜ 0.01 ),and positive appraisal coping had negatively correlations with them (( r =-0.34 ～-0.41,P＜0.01 ).(2)Positive appraisal coping,confrontive coping and emotion-focused coping could predict 33.5％ of error behaviors and 23.5％ of slip behaviors.And confrontive coping and positive appraisal coping could predict 40.2％ of speeding and violation behaviors.(3) Compared with safety drivers,accident drivers had significantly differences in confrontive coping in mild and moderate crashes( t=-2.75,2.80,P＜ 0.01 ).ConclusionDriving coping styles are the important factors influencing drivers' behaviors and road safety.

Animals ; Evoked Potentials, Motor ; physiology ; Male ; Rats ; Rats, Sprague-Dawley ; Signal Transduction ; Spinal Cord ; physiology

Objective To explore the characters of non-professional drivers' stress. Methods Two hundred and sixty-four non-professional drivers in Chengdu city were randomly investigated by Driver Stress Inventory(DSI). One hundred and five professional drivers were as control group. Results ①Compared with professional drivers,non-professional drivers scored higher in thrill seeking, cognitive fatigue and aggression (non-professional drivers :4.63±1.49,5.12±1.56,5.65±1.42; professional drivers: 3.60 ± 2.04,3.97 ± 2.02,4.56 ±1.84, P ＜ 0.01 ) ,and lower in hazard monitoring, driving anxiety and physiological fatigue (non-professional drivers:7.04±1.48,6.44±1.50,5.78±1.75; professional drivers:7.89 ± 1.45,6.99 ± 1.28,6.45 ± 2.37, P ＜0.01 ). ②Non-professional drivers' stress had significant differences in gender, age, marital state and driving experiences (P＜0.05). The male drivers scored higher in thrill seeking, aggression and physiological fatigue (male:4.79±1.53,6.78±1.46,5.94 ± 1.80; female:4.32±1.37,5.80±1.37,5.50 ± 1.61, P ＜ 0.05 ). Compared with other age driver groups, the 20 ～29 driver group scored higher in cognitive fatigue (5.44 ± 1.38 ), and lower in hazard monitoring(6.77±1.44) ,driving anxiety (6.03 ±1.46). Compared with unmarried drivers, married non-professional drivers scored higher in hazard monitoring and driving anxiety ,and lower in cognitive fatigue( married drivers:7.23±1.43,6.65±1.48,4.88±1.6; unmarried drivers :6.77±1.47,6.06±1.43,5.59±1.36, P ＜0.05 ). The non-professional drivers who drove more than 20 thousand kilometers scored higher in driving anxiety (6.89±1.41). Conclusion The non-professional drivers' stress isn' t optimistic, and influenced by their gender,age, marital state and driving experiences. Stress management should pay attention to them.

Objective To probe the biological degradation of composite bone cement of calcium phosphate and cancellous bone granules,as well as its biophysical and solidifying characteristics.Methods The specimens of composite bone cement were determined by its solidification,which were made of 2.5g calcium phosphate cement mixed either with10%,15%,20%,25%,30%or 35%bone granules of 0.5～1.0mm diameter.The cylindrical specimens of 10mm diameter and18mm length were used for biomechnical test.Furthermore,the bone defect of 5mm?5mm?6mm in12canines were made in L 3 and L 4 verte bral body through anterolateral lumbar vertebral body approach,and composite bone cement with20%bone granules and calcium phosphate cement were filled into the bone defects respectively.The bone formation was evaluated by X-ray and histological examination.Results The composite bone cement with less than20%cancellous bone granules displayed excellent solidifying character,while with the diameter of 0.5～1.0mm and the content of 15%to20%cancellous bone granules,the maximal load and com pressive strength of the composite bone cement were of no significant difference with calcium phosphate ce ment ;but the biomech nical characteristics would decrease if the diameter was1.0～2.0mm despite of the content 15%to20%gran ules.New bone formation were observed in the center of composite bone cement 2months later,and com posite bone cement were replaced mostly by new bone at4months;while in calcium phosphate cement group,only slight degradation occurred at the interface of implant material and host bone at2and4months.Conclusion The composite bone cement of calcium phosphate with20%content and0.5～1mm di am eter of can cellous bone granules can provide the ability of rapid degradation and bone formation.The re sults of study present the basic data of the reparative materials with the composite bone cement for verte-broplasty clinically.

This study aims to investigate the relationship between odor and contents of the chemical compounds in Lonicera japonica, including chlorogenic acid, galuteolin and polyphenols. High performance liquid chromatography (HPLC) was applied to determine the contents of chlorogenic acid and galuteolin in L. japonica. The ponptent of polyphenols was determined by UV-Vis Spectrophotometry. Electronic nose was used to extract and measure the odor of L. japonica. Then SPSS 17.0 software was employed for data processing. There is a significant positive correlation between the comprehensive index value of aroma and the contents of chlorogenic acid and polyphenols. The regression equations have been established. However, the relationship between the comprehensive index value and the content of galuteolin is not obvious. This is proof that the odor of L. japonica has close connection with the chemical compounds. Therefore, this research offered a new method for initially determine or predict the content of the chemical composition in L. japonica,
Chlorogenic Acid ; chemistry ; Chromatography, High Pressure Liquid ; methods ; Electronic Nose ; Lonicera ; chemistry ; Odorants ; analysis ; Polyphenols ; chemistry ; Smell

ObjectiveTo compare the diagnostic value of magnetic resonance imaging (MRI),computed tomography (CT) and radiography in the early detection of arthropathies of haemophilia.Methods Prospective studies of 21 joints in 11 patients were studied with X-ray,CT and MR examination. The 21 joints with haemophilia arthropathies were divided into three groups according to Pettersson scoring system.0 point were the first group,＜4 points were the second group,≥4 points were the third group.Abnormal imaging findings of osteoporosis,enlarge epiphysis,erosion of cartilage,irregular subchondral surface,narrowing of joints space,joint deformity,subchondral cyst formation,effusion/haemarthrosis of joint,synovial hypertrophy with haemosiderin,deformity of joints were used for all imaging comparison.The results were analysis with Chi-square test.To compare the first group,irregular subchondral surface and the number of subchondral cyst formation of all symptomatic joints were detected by CT and MR,the results were analysis with pair-sample t test.ResultsModerate and severe hemophilic joints were found in 80.95％ (17/21)of twenty-one symptomatic joints,and mild hemophilic joints were found in 19.05％ (4/21).The detected results were the same in enlarge epiphysis,narrowing of joints space,joint deformity in all joints by radiography,CT and MR.Significant difference in detection of irregular subchondral surface,subchondral cyst formation,effusion/haemarthrosis of joint,were found between radiography with either CT (x2 value 19.06,16.70,4.84,P ＜0.05 ) or MRI (x2 value 19.06,16.70,7.76,P ＜0.05),Significant difference in detection of the first group joint irregular subchondral surface and the subchondral cyst formation total number were found between CT and MR ( x2 =3.29,P ＜ 0.05 ). Conclusions MR and CT were superior in detection of the early abnormal changes in evaluating hemophilic arthropathies,however CT could detect more smaller irregular subchondral surface and subchondral cyst formation than MR.

Objective To observe the morphological characteristics of HCV particles and intracel-lular ultrastructure changes in Huh7. 5 cells which was infected with chimeric HCV via transmission electron microscopy. Methods Plasmid J6/JFH encoding the full length HCV chimeric genome was transcribed to HCV RNA in vitro and the RNA was transfected into Huh7.5 cells by electroporation. Quantitative real-time PCR(qRT-PCR) was used to assay HCV copies of the supernatant of transfected cells. Indirect immunofluo-rescence was used to detect the expression of HCV proteins. The cell culture superoatant were used to infect narve Huh7.5 cells, transmission electron microscopy was used to observe morphological characteristics of vi-rus particles and intracellular ultrastructure changes in infected Huh7. 5 cells. Results qRT-PCR showed high level virus copies in supernatant of transfected cells collected in different times, indirect immuno-fluo-rescencc proved high expression of HCV NS5A proteins in the transfected cells. Large numbers of enveloped or unenveloped virus-like particles (VLPs) were observed in infected Huh7. 5 cells via transmission electronmicroscopy. We also found hyperplasia of some membrane-enclosed organelles in the cytoplasm. Several fea-tures characterizing flavivirus infected cells and a cytoplasmic inclusion of unknown origin were observed. Conclusion The chimeric HCV from in vitro cell culture system is proved to be intact virus particles which can efficiently infect Huh7.5 cells.

96%).There are 14 nucleotide mutations between yak and cattle and 3 of that were predicted to alter the protein sequence,both of which occurred in the domain III.Construction of molecular phylogenetic tree shows:The cluster results coincided with the traditional taxonomy.