Objective The high quality RNA from the plantlet of Dendrobium candidum was isolated efficiently.It laid a foundation to study the mechanism of molecular expression on its growth and metabolism under environmental stress.Methods The groups stimulated by sound wave and the control groups were established.Total RNA was prepared by a modified phenol-chloroform method.The content was determined by a spectrophotometer.The integrity of RNA was detected by electrophoresis with 1.0% denatured agarose gel.The total RNA obtained was amplified by RT-PCR.The differential cDNA bands were displayed on 6% denatured polyacrylamide gel by electrophoresis and silver staining.Results The ratios of total RNA A_(260)/A_(230) and A_(260)/A_(280) were 3.16 and 1.96,respectively.The yield was 0.27 ?g/mg fresh weight.The bands were clear on agarose gel and the integrity of RNA was good.The differential cDNA bands were screened with molecular weight of 240—600 bp.Conclusion The method of modified phenol-chloroform can be used to isolate RNA from D.candidium with high quality and high yield.

OBJECTIVE To compare the effectiveness of two laboratory detections methods of Epstein-Barr virns (EBV). METHODS Immuno-fluorescence technique was applied to detect the serum EBV-specific antibody and EBV-DNA was identified by fluorescence quantitative polymerase chain reaction (FQ-PCR) in 124 children infected with EBV. RESULTS The positive rates of VCA-IgM,VCA-IgG,EA-IgG,EBNA-1-IgG and EB-DNA in various samples of 124 cases were 0,89.5%,23.4%,49.2% and 30.3%,respectively,with 21 cases (16.9%) showing simultaneously positive in EB-DNA and EBNA-1-IgG. CONCLUSIONS The two laboratory detections of EBV share their advantages and disadvantages. FQ-PCR is a method for time-saving,accurate and sensitive detection of EBV-DNA,showing clinical significance in the diagnosis of EBV-associated diseases. It's worthy of clinic application.

Cone-bine CT(CBCT)images of 2 130 maxillary third molars were divided into 3 groups according to the impaction position. The relationship between the floor of maxillary sinus and the roots of maxillary third molar was analyzed and compared.In low,median and high impaction groups the probability of the root tip of maxillary third molar higher than the floor of maxillary sinus was 4.5%,10.3% and 14.6% respectively.

Objective To study the curative effects of surgical treatment of the severelv displaced supracondylar fracture of the humerus in children. Methods A retrospective investigation was conducted on 316 children with severely displaced supracondylar fracture of the humerus who had been treated with operation in our hospital from June 2001 to June 2006.There were 215 boys and 101 girls,with an average age of 7 years old(range,1 to 14).All were treated with open reduction and internal fixation by Kirschner wire,plaster external fixation after operation,and functional training 2 to 4 weeks postoperatively. Results All the 316 cases were followed up for over 6 months to 5 years, with an average of 2 yearS and 10 months. The functional recovery of the postoperative elbow joint was evaluated by Flynn's criteria.Of them,253 cases were rated as excellent,34 as good,25 as satisfactory,and 4 as poor.Cubitus varus deformity was found in 27 cases. Conclusions Although closed reduction and external fixation is the frst choice for the pediatric supracondylar fracture of the humerus, open reduction and Kirschner wire fixation is necessary for the severely displaced supracondylar fracture of the humerus,including those suffering from failed manipulative reduction,open fracture,vascular and neural injuries and limited function of the elbow joint. Anatomic reduction of broken ends,Kirschner wire internal fixation and early functional training are significant in the therapeutic efficacy of operation,and in the prevention or reduction of postoperative complications.

Objective To study factors that may increase the expression of human ? synuclein gene in prokaryotic cells. Methods proEXNACP vector was transferred into competence cells. Factors such as IPTG levels, initial concentration of cells, type and pH of media, time and temperature of induction were studied in relation to the production of ? synuclein. Results IPTG concentration and pH change does not have a significance impact on ? synuclein production. But the time and temperature of induction, media and initial concentration of cells significantly affected the expression.Conclusion The best condition for the production of ? synuclein includes factors such as LB media with an initial concentration of cells of 0 5\|0 8 A at 37℃ culture with oxygen of 180?rpm/min for 1 2?hours.

Objective To investigate the relationship between the change of HDL level and the severity in patients with sepsis.Methods The levels of HDL were measured in 68 patients with sepsis who were divided into light,middle and heavy group by APACHEⅡscore after final diagnosis of 0,1,2,3,7,14.28 days.Results The levels of HDL in patients with sepsis were lower than those of the normal:the levels of HDL began to decrease at 0 day,got to lowest point after 3 days,and up-regulated gradually after 7 to 28 days.The levels of recovery were the highest in light group,and the lowest in heavy group.Conclusion The levels of HDL in patients with sepsis are low,which is related with the severity of sepsis.

Objective To observe the clinical features of abdominal aortic aneurysm(AAA)in the elderly. Methods Seventy-eight elderly cases with AAA were studied retrospectively,the effect of age and AAA size on the growth of AAA were analyzed. Results Risk factors such as smoking,hypertension,hypercholesteremia and artherosclerosis were found in most patients. Aneurysm in other side was found in 25.6%of the patients.Rupture occurred in patients with a larger in size or rapidly developing AAA.The average AAA diameter inerease was 0.1 4 cm/year and it was similar for each age grade.When the AAA diameter was wider than 5 cm,it developed faster.and the growth velocity increased to 0.46 cm/year. Conclusions Age is not a risk factor that affects the development of AAA.If the AAA diameter is≥5 cm,the AAA develops quickly,then active interventions are recommended.

Objective To construct baculovirus expression system for the human plasminogen kringle 5(hK5) gene,and detect its expression in Spodoptera frugiperda 21(sf21). Methods Baculovirus Bacmid-rhK5 was prepared with bac-to-bac baculovirus expression system,and sf21 cells were infected.The expression of rhK5 in sf21 cells was determined by Western blot.The activity of purified protein was detected by vascular endothelial cell inhibition test. Results The pFastBac HTB-rhK5 was successfully constructed,and sf21 cells were transfected with the constructed vector.The output of rhK5 obtained was 90 ug/L,and the protein possessed the inhibitory activity of endothelial cell proliferation.The median effective dose(ED50) was 4 ug/mL. Conclusion The rhK5 baculovirus expression vector is highly expressed in sf21 cells,which lays a foundation for the the expression of rhK5 protein with biologic activities.

Objective　To search for a simple and rapid skin expansion. Methods　 CCPSEPA-A kind of mutual feedback type continuous normal saline perfusion system was assembled with the use of conventional transfusi on apparatus, sphygmomanometer, three-way stopcocks, plasma bag etc.14 cases ( 17 expanders) were carried out with such a device, controlled by patients themselves. Results 　The volume of expanders was 50～300 ml and the duration of expansion was 7～14 days. All the cases proved a wonderful effect that the expansion was finished by only one or two times of water filling of storage water bag, and without any complications.Conclusion　CCPSEPA is a new skin expansion apparatus of new type and practical ,simple and low price .The general goal of safe,simple, rapid and useful was realized basically by the device,and worth popularizing.

[Objective]To study the effect of repairing of rat peripheral nerve defect with engineering artificial nerve composed with Schwann cells and poly lactic glycoli aced(PLGA).[Method]Human Schwann cells were vaccinated into PLGA tube with polyglactin 910.Sixty SD rats were divided into 3 groups randomly with 20 rats in each one: group A,self-nerve graft;group B,Schwann cells artificial nerve;group C,pure PLGA.Evaluations of electrophysiological and histological examines were carried out 8 weeks ad 12 weeks after operation.[Result]The outcome of group B showed similar to group A in general and histological study,however it expressed slightly lower in electrophysiological study,muscle weight and nerve fiber quantity.Marked neuron could be found in spinal cord after group B had been traced.Large number of regeneration nerve fibers could be seen from electron microscope.[Conclusion]The tissue engineering artificial nerve composed with Schwann cells is able to repair 20 mm defects of peripheral nerve,and it has an approximate treatment effect to the self-nerve grafting.