Digital subtraction angiography has long been recognized as a gold standard for detecting cerebrovascular lesions.With the development of CT techniques,CT angiography(CTA)has been widely used in intracranial and extracranial vascular evaluation.This article reviews the development of CTA technique and its application in the diagnosis of cerebrovascular lesions.

Objective To assess the efficacy and safety of aspirin for type 2 diabetes mellitus(T2DM).(Methods)Electronic database searching was performed on Medline,Cochrane Library and CBM,and the data from the beginning of the database to October 2005 were included.Randomised and quasi-randomised trials concerning aspirin treatment for T2DM were selected and assessed for the methodological quality,and the extracted data were performed Meta-analysis by statistical software RevMan4.2.8. Results Fourteen randomised and quasi-randomised trials met the inclusion criteria,including 7 papers of aspirin treatment for T2DM,3 papers of aspirin treatment for cardiovascular complication of T2DM and 4 papers of aspirin treatment for type 2 diabetic retinopathy.Compared with placebo treatment,aspirin showed significant positive effects on lowering blood glucose(SMD,0.73;95%CI,(-1.11 ~-0.36;)P=0.0001).In diabetic patients,aspirin treatment was associated with a significant reduction in the total cardiovascular events(RR,0.78;95%CI,0.68 ~ 0.98;P=0.03).Aspirin treatment neither lowered(nor increased) the risk of the development of diabetic retinopathy(RR,1.02;95% CI,0.97 ~ 1.07;P=0.54).(Conclusion Aspirin treatment) can be a choice for T2DM,especially for the patients who have evidence of cardiovascular disease or have high risks for cardiovascular disease.

Objective To study the construction of recombinant wild lipoprotein lipase(LPL) gene plasmid and its expression in COS-1 cells. Methods The LPL cDNA was isolated from the human epiploon adipose tissue by means of RT-PCR.The LPL cDNA was ligated into the pcDNA3.1Zeo(+).The recombinant pcDNA3.1Zeo(+)-LPL cDNA was identified by endonucleases,PCR and DNA sequencing.COS-1 cells were transfected with the recombinant LPL gene plasmid using Lipofectamine 2000~(TM).The LPL mass in cells and the culture medium were determined by a Markit-M LPL Kit.Spectrophotometry was used to measure the LPL activity. Results The LPL gene was ligated into the pcDNA3.1Zeo(+) plasmid identified by endonucleases and PCR.The sequence of the LPL gene was the same as the sequence of the Gene Bank identified by DNA sequencing.Wild pcDNA3.1Zeo(+)-LPL(cDNA) plasmids was transformed into the COS-1 cells. Conclusion The recombinant plasmid pcDNA3.1Zeo(+)-LPL cDNA could be constructed and successfully transformed into the COS-1 cells.

Objective To investigate the changes and clinical significance of serum procalcitonin (PCT) level in children with acute phase of Kawasaki disease (KD). Methods The serum PCT levels and their changes before and after the treatment in 120 children with KD at acute phase were retrospectively analyzed. According to the results of ultrasonic echocardiography, all children were divided into coronary artery damage (CAL) group and no coronary artery lesion (NCAL) group. According to the presence of gastrointestinal symptoms, patients were divided into two groups (A: yes and B: no ). According to the presence of abnormal liver function, patients were divided into two groups (C:yes and D:no). PCT levels were compared between groups. Results The serum PCT levels were increased at acute phase in 56 (46.67%) patients before the treatment than those in normal children, which were decreased obviously after treatment (P<0.05). There were 31 cases combined with CAL, the rising rate of PCT was 38.71%, which was no significant difference compared with that of NCAL group (49.44%, P>0.05). There was no significant difference in serum PCT value between CAL group and NCAL group (P>0.05). The serum C-reactive protein level was significantly higher in CAL group than that of NCAL group. There were 35 patients combined with gastrointestinal symptoms in 120 KD patients. There was no significant difference in the rising rate of PCT between patients with gastrointestinal symptoms (62.86%) and patients without gastrointestinal symptoms (40.00%, P<0.05). There was no significant difference in serum PCT level between these two groups of patients. There were 42 cases with liver dyfunction in 120 KD patients, the PCT rising rate (52.38%) was no statistically significant difference compared with that of patients with no liver dyfunction (43.59%, P>0.05). And there was no significant difference in serum PCT value between the two groups (P>0.05). Conclusion PCT can reflect the acute phase of KD patients. The increased PCT level may be related with the emergence of gastrointestinal symptoms, even though it cannot predict CAL and the occurrence of liver damage.

Objective To synthesize an inhibitory peptide against serine protease of hepatitis C virus(HCV)and explore its inhibition ability in vitro. Methods Based on the sequence characteristics of four natural substrates of protease in HCV,the gene sequence of an inhibitory peptide against HCV serine protease was designed and directly synthesized by PCR. The segment was subcloned into prokaryotic expression vector pBVIL1,resulting in the construction of the recombinant plasmid pBVIL1/IP,which was then transformed into E. coli HB101 strain. Purified by ion exchange chromatography,the expressed protein was added into an in vitro system,which was comprised of the inhibitory peptide(expressed protein),protease and the substrate,i.e. a NS5A-B fragment,in phosphate buffer. Then SDS-PAGE was performed to test the inhibition effect of the polypeptide. Results The recombinant expression vector pBVIL1/IP containing target gene was successfully constructed. The peptide expressed as inclusion boay was identified by SDS-PAGE. The degradation of protease substrate NS5A-B fragment is inhibited proportionally with the increasing concentrations of the peptide. Conclusion The recombinant peptide shows inhibitory effect on HCV protease in vitro.

Objective To investigate cell's viability and functions when human hepatocyte cell HepG2 and microcarriers were embedded in collagen gel and cultured in vitro.Methods Ultrasound concussion crushing method was used to get nanofiber microcarrier.HepG2 and microcarriers were embedded in collagen gel and cultured in 12 d.The albumin (ALB),urea and lactate dehydrogenase (LDH) levels in the nutrient solution were measured.Results The cells in nanofiber nanofiber microcarrier/collagen gel group were gathered around the microcarrier and formatted aggregates,the ALB and urea levels increased steadily and reached maximum in day 9,then decreased; In collagen gel without nanofiber microcarrier group cells uniformly distributed,the ALB and urea levels reached maximum in day 3,then decreased rapidly,and on day 6 majority of cells dead.Conclusion Gel entrapped nanofiber microcarriers and hepatoeytes is a high-density and longtime culture method which can possibly be used in the bioartificial liver system.

The intracellular signal transduction pathways play an important role in the occurrence and development of thyroid cancer.Mitogen activated protein kinase (MAPK) signal transduction pathway,phosphatidylinositol 3-kinase (PI3K)-AKT pathway,NF-κB pathway and RASSF1-MST1-FOXO3 pathway affect the occurrence and development of thyroid cancer by modulating the activity and expression of specifical proteins,and determine the growth and apoptosis of thyroid cancer cells.

Hospital business process optimization and reengineering is an effective method and channel for hospitals to enhance medical and management quality, realize cost minimization, improve efficiency, and increase benefits. The paper gives an account of the theories, methods, steps, relevant techniques, and tools of hospital business process optimization and reengineering, discusses the systematic framework for hospital business process improvement and key success factors and obstacles for hospital business process reengineering, analyzes the relationship of business process reengineering with hospital organizational structures and hospital information systems, and puts forward assessment criteria for hospital business process optimization and reengineering.

Objective To understand the antibody levels after the inoculation of measles ,poliomyelitis ,epidemic encephalitis B and hepatitis B vaccines among healthy children aged 7 - < 13 years old in Guangshui City of Hubei province to provide the scientif ‐ic basis for formulating the immune prevention and control strategy and risk assessment in whole city .Methods 4 616 healthy chil‐dren aged 7 - < 13 years old were sampled from the whole city .The enzyme‐linked immunosorbent assays (ELISA) was used to de‐tect the 4‐antibody levels .Results The antibody positive rates of measles ,poliomyelitis ,epidemic encephalitis B and hepatitis B a‐mong healthy children aged 7 - < 13 years old in Guangshui City were 94 .41% ,93 .07% ,93 .78% and 68 .72% respectively .The protection levels of first three kinds of antibody reached more than 85% ;the positive rates had statistical difference among 4 kinds of antibody(χ2 = 1 987 .08 ,P = 0 .000) .The antibody positive rates of epidemic encephalitis B had no statistical difference among different age periods (χ2 = 10 .141 ,P= 0 .071) ;the antibody positive rates of measles ,poliomyelitis and hepatitis B had statistical difference among different age periods(χ2 = 40 .471 ,P = 0 .000 ;χ2 = 25 .174 ,P = 0 .000 ;χ2 = 283 .641 ,P = 0 .000) .The positive rates of 4 kinds of antibody had no statistical difference between different genders (χ2 = 0 .019 ,P= 0 .889 ;χ2 = 1 .017 ,P= 0 .313 ;χ2 = 0 .018 ,P= 0 .892 ;P= 0 .639 ,P= 0 .424) ;the antibody positive rates of measles ,poliomyelitis and epidemic encephalitis B had no statistical differences among 17 villages and towns in the whole city (χ2 = 0 .099 ,P= 1 .000 ;χ2 = 0 .117 ,P= 1 .000 ;χ2 = 0 .134 , P= 1 .000) ,while the antibody positive rate of hepatitis B had statistical difference among these villages and towns (χ2 = 186 .179 , P= 0 .001) .Conclusion The antibody levels of measles ,poliomyelitis and epidemic encephalitis B reach the protection rate ,but the antibody level of hepatitis B needs to be increased .The monitoring work should be continuously strengthened and the seeking missed inoculation and re‐inoculation work should be reinforced .

OBJECTIVE:To prepare borneol-puerarin liposomes,and to investigate its brain-targeting. METHODS:Film dis-persion ultrasonic method was used to prepare borneol-puerarin liposomes. The morphology of liposomes was observed by TEM;the particle size and Zeta potential were measured by laser particle size analyzer;the entrapment efficiency were measured by sepha-dex gel filtration method. Compared with Puerarin injection,brain-targeting of borneol-puerarin liposomes and puerarin liposomes via intravenous injection of mice tail was studied with relative intake rate and peak concentration ratio. RESULTS:Borneol-puerarin liposomes were spherical or quasi-circular;its mean particle size,polydispersity index and Zeta potential were 226 nm,0.263 and-21.3 mV respectively. The entrapment efficiency were(65.32±2.13)%. Compared with Puerarin injection,relative intake rate of puerarin liposome and borneol-puerarin liposome were 1.68 and 2.58,and peak concentration ratio were 1.15 and 1.42. CONCLU-SIONS:Brain-targeted borneol-puerarin liposomes are prepared successfully.