ObjectiveTo study the relation of phonation and respiration in normal subjects. MethodsUsing Aerophone Ⅱ Model 6800 and Visipitch 6097, vital capacity was recorded first , then the simultaneous phonation volume, maximum sustain phonation time,mean airflow rate,sound pressure level and average pitch were recorded in order to induce the relation of phonation and respiration in normal subjects. ResultsThere was a linear correlation between phonation volume and vital capacity. Maximum sustain phonation time varied with changes of mean airflow rate and phonation volume and mean airflow rate varied little in different subjects and had no relation with average pitch and sound intensity. ConclusionMaximum phonation time, the mean airflow rate and ratio of phonation volume to vital capacity can be used as indicator in clinical application.

Objective To explore the clinical manifestation and therapeutic effect of children's oral mucosa factitious ulcer.It aims to improve the diagnosis and therapy level of such ulcer.Method 36 cases with children's ulcer symptoms and mental attitudes were observed.Tothlcases and were divided into 3 groups.Group 1:Take medicine(Inosine Pill 0.2,Vitamin B6 Pill 10 mg)3 times a day;use EGF spray for some part,together with psyehotherapy for 1 month.Group 2:Adopt orthodontics to correct factitious habit and use psychotherapy.Group 3:Group 1+Group 2.Trackingrandomly for 1 month,3 months,half a year,1 year,check the therapeutic and ulcer healing-up progress by further consultation.Result According to 36 cases,boys are more vulnerable to such disease.They tend to bite cheek,tongue,lips.Ulcer used to happen on tongue brim mucosa,quantity 1～3,size 0.2～1.8 cm,irregular appearance,white keratosis surrounding,priority therapy is to correct factitious habit.15 cases(41.67%)healed,9 cases(25.00%)showed good result,10 cases(27.57%)were efficacious,2 cases(2.78%)ineffective.The thempeutic effect of Group 3 is much better than Group 1 and Group 2.Conclusion The diagnostic importance of such disease is factitious habit.Correct factitious habit and psychotherapy are the important therapeutic methods.This disease can be the oral manifestation of children's Attention Deficit Hyperactivity Disorder.

AIM To establish the expermental model in vitro for the study of mechanism of antitumor drug resistance and the screening of antitumor drug. METHODS By continuously exposing cells to gradually increasing concentration of drug and agar cell colony forming technique, using dye exclusive method for determing cytotoxic effect, a murine leukemia L1210 cell subline were established,which exhibited 40 fold resistance to Cis diamminedichloro platinum(DDP). RESULTS The doubling times, plate efficiency, cell cycle, DNA index and cell morphology of DDP resistant L1210 subline were similarto those of its parant cell line. When the cell subline was stored with DDP at -196℃ for 6 months and then was recovered, its characterization of antitumor drug resistance was still maintained to a period of 5 months without DDP. DDP resistant L1210 subline was characterized with cross resistance to Carboplatin, Mitomycin, Thio Tepa, Methotrexate, Vincristin and Mustine Hydrochloride, but with no cross resistance to Harringtonine and Adriamycin. It was seemed more sensitive to Cytarabine and Fluorouracil. CONCLUSION DDP resistant L1210 subline is a good experimental model in vitro for the study of mechanism of antitumor drug resistance and the screening of antitumor drug.

Objective:To explore the factors influencing patient safety behavior of nursing students during clinical practice.Methods:A cross-sectional study was used, in which a total of 214 participants completed the online survey related to the undergraduate nursing students ′ clinical teaching satisfaction scale, safety attitude questionnaire and nurse safety behavior questionnaire. Results:The mean scores of clinical teaching satisfaction, safety attitude and nurse safety behavior were (3.83±0.81), (3.70±0.65) and (3.93±0.79) respectively. There were positive correlations between clinical teaching satisfaction, safety attitude with the nurse safety behavior ( r=0.82, 0.75, P<0.01). The results also showed that the same shifts with their clinical instructors, clinical teaching satisfaction and safety attitude could affect safety behavior of nursing students ( F=67.81, R2=0.753, ΔR2= 0.742, P=0.00), which accounted for 74.20% of total variation. Conclusions:The same shift arrangement for both clinical instructors and nursing students, enhancement of the demonstration and guidance from clinical instructors, as well as strengthening the cultivating patient safety attitude would be beneficial to promoting the safety behavior of nursing students during clinical practice.

Objective: To investigate the effect of matrine (Ma) on telomerase activity and cell cycle in hepatoma cell line HepG 2 cells. Methods: TRAP ELISA method was used to determine the telomerase activity in HepG 2 cells which were treated with different concentrations of Ma. Plasmid inserted with 800 bp of the human telomerase reverse transcriptase (hTERT) promoter was transiently transfected into HepG 2 cells by lipofect. Different concentrations of Ma were added into culture media 2 h later, and the activity of the hTERT promoter was tested 48 h after transfection. In addition, the percentages of HepG 2 cells in different cell cycle were determined by the flow cytometry on the 24, 48 and 72 h respectively after adding the different concentrations of Ma. Results: The telomerase activity of HepG 2 was suppressed by Ma at the dose of 750 ?g/ml and the expression of hTERT promoter was also inhibited. The percentage of G 0/G 1 stage cells increased and the percentage of S and G 2/M stages cells decreased in both 500 ?g /ml and 750 ?g /ml groups 48 and 72 h after Ma was added. Conclusion: Ma may have inhibitory effect on hTERT promoter expression, which is related to the telomerase activity and cell cycle regulation.

Objective To evaluate the effect of ion chamber sensitive volume on absolute dose verification in CyberKnife plan.Methods Solid water phantoms were scanned by a CT scanner, single-field plan, multi-field isocentric plan and sequential optimized plan were designed by the treatment planning system.Absolute doses were measured at the specified point in each plan using the ion chambers with sensitive volumes of 0.007 cm3(A16), 0.24 cm3(A12 s), and 0.6 cm3(PTW30013) and compared with calculated values.Results For the single-field plan, the relative error increased as the aperture size of collimator decreased;with relative errors within ±2%, the smallest aperture sizes of collimator were 12.5 mm (A16), 25 mm (A12 s), and 30 mm (PTW30013).For the multi-filed isocentric plan, the relative errors were 0.26%±3.90%(A16),-6.28%±14.33%(A12 s), and-9.41%±14.10%(PTW30013).For the sequential plan optimized with 15 mm cone, the relative error was 0.79%±1.43%;for the sequential plan optimized with 7.5 mm cone, the relative error was 2.01%±8.39%.In absolute dose verification for clinical plans, there was no significant difference between the results measured by these ion chambers (P=0.985).Conclusions There is no significant effect of ion chamber sensitive volume on absolute dose verification in CyberKnife plan under the following two situations:(1) the collimator with a relatively large aperture is used;(2) the sensitive volume of ion chamber is totally covered by the prescription isodose line.

Objective To compare the effects of application of clavicular hook plate combined with wire anchors anatomical coracoclavicular ligament reconstruction and application of clavicular hook plate in the treatment of NeerII distal clavicle fracture and Tossy Ⅲtype~V acromioclavicular joint dislocation. Methods A retrospective analysis of the clinical data from June 2006 to June 2013. Total 73 cases patients suffered with Neer Ⅱtype distal clavicle fractures and Tossy Ⅲtype~V acromioclavicular joint dislocation. Of which , 41 cases were subjected to treatment with clavicular hook plate , 32 patients subjected to treatment of using clavicular hook plate combined with anchors .The incision length, operative time, postoperative complications, length of hospital stay and postoperative 1 month, 6 month shoulder VAS score of two groups were analyzed; the shoulder function of both groups after 1 month, 6 months were assessed by using Constant shoulder function assessment method. Results Surgical incision length and operational time between the two groups were statistically significant (P<0.05), while the amount of bleeding was not statistically significant. All patients were followed up . The two groups did not occur any complications such as loosening, decoupling, acromioclavicular joint dislocation and wound infections. Hospitalization time was 5~14 d (averaged 10d), no significant difference between two groups. 4 the shoulder Constant score and VAS scores showed no significant difference 1 months postoperation; 6 months after hook plate removed, VAS score and Constant shoulder score improved significantly in anchors hook plate group (P<0.05). Conclusion Anatomical coracoclavicular ligament reconstruction by application of hook plate combined with anchors is a good biomechanical model characterized with simple surgery , less trauma and good clinical outcomes , worthy of clinical application.

Objective To evaluate the repeatability of the aperture sizes based on the Iris variable aperture collimator (Iris collimator) of CvberKnife VSITM.Methods Radiochromic films were placed at 800 mm of source-to-axis distance (SAD),and Iris quality assurance (QA) software was used to extract the information from the digital images,which were exposured by X-ray beams.Results The average aperture accuracy of Iris collimator was better than 0.11 mm over the beam range 5-40 mm,and the accuracy for 50 mm and 60 mm beams was within 0.19 mm.Conclusions The results suggest a good repeatability of aperture sizes for the CyberKnife VSITM Iris collimator.

Objective To clone platelet-derived growth factor A chain (PDGF-A) gene and insert PDGF-A gene into. Enhanced green fluorescent protein (EGFP) vector and then transformed into dermis-drived mesenchymal stem cells (DMSCs). Methods cDNA clones encoding human PDGF-A gene were isolated from a human hepatoma cell line mRNA by reverse transcription-polymerase chain reaction (RT-PCR). The PCR amplified fragment of PDGF-A gene was cloned into pMD18-T vector. The eukaryotic expression vector pEGFP-N1/PDGF-A was constructed by subcolone PDGF-A gene into pEGFP-N1 vector. PDGF-A gene was transfected into DMSCs with the help of Fugene 6 transfection reagent. Results Full cDNA sequence encoding human PDGF-A gene had been cloned, which sequence was consistent with the reported sequence in GenBank by sequence assaying. Conclusion cDNA sequence encoding human PDGF-A gene was successfully cloned into pEGFP-N1. The transient expression of PDGF-A gene in DMSCs has been realized.

Objective To assess the diagnostic value of MR imaging of the wrist synovitis in early rheumatoid arthritis.Methods 60 wrists in 30 patients underwent MR imaging examination,including T1WI,T2WI,STIR and contrast-enhanced fat-suppressed 3D fast-gradient-echo sequence.MRI manifestations were analysed in comparison with clinical and laboratory test data.Results All changes including synovial hyperplasia and pannus formation(30 cases),articular cartilage destruction(21 cases),bone erosion(16 cases),joint effusion(25 cases) and tendon lesion of wrists could be showed clearly by MRI.The signal intensity of the pannus before and after administration of contrast agent and the enhanced curve of the pannus could be used to assess the lesions whether or not activation.Conclusion MRI is helpful in diagnosing early rheumatoid arthritis.