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 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.

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 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.

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 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 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 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.

AIM: To investigate the effects of oral administration of Astragalus membranceus, mung bean and arsenolite on the toxic of the arsenolite induced rats and the possible mechanisms with metallothionein (MT). METHODS: All the rats were oral administration with arsenolite. The Astragalus membranceus and mung bean were compared with the cadmium chloride which induced MT synthesis. The contents of MT were determined by cadmium saturation method, the liver mRNA levels for MT 1, MT 2 were detected by RT PCR. The protective effects of renal and liver were observed by testing alanine aminotransferase (ALT), blood urea nitrogen (BUN) and serum creatinine (SCR). RESULTS: The contents of MT were accorded with the mRNA expression of MT 1, MT 2. Arsenolite, Astragalus membranceus and mung bean could induce the synthesis of MT, but the contents of MT which arsenolite induced were trace. The contents of MT significantly increased after oral administration of Astragalus membranceus and mung bean, especially in the Astragalus membranceus group (P

There are lots of contents in the clinical teaching of cardiothoracic surgery , but the teaching time is short .What should be concerned by every cardiothoracic surgery teacher is how to make full use of the limited time to make students grasp the main contents of cardiothoracic surgery .It is crucial to develop new models of education and assessment .We discuss efforts in our teaching , including new teaching paradigms , teaching tools and multimedia teaching .The combination of varieties of teaching methods , clinical and basic teaching , theory teaching and clinical practice may improve the quality of clinical teaching in cardiothoracic surgery .