Objective To clone human chemokine ELC and express the ELC fusion protein. Methods Total RNA from human inflammatory tonsil was extracted and the cDNA was generated with reverse transcription. Mature ELC gene was amplified with PCR and NcoⅠand EcoRⅠ sites were added to the 5′ and 3′ terminal respectively, and then cloned into pET32a(+). E.coli DH5? was transformed with the recombinant plasmid, and positive clones were selected. The inserted DNA was verified by enzyme digestion and DNA sequencing. The fusion expression vector of mature ELC was formed with deletion mutation. ELC expression was analyzed by SDS-PAGE and Western blotting and the ELC fusion protein was purified. Results Human chemokine ELC was successfully cloned and the fusion protein was expressed and purified. Conclusion The ELC fusion protein was expressed with solubility.

0.05).Conclusion Our findings suggest that patters of gene expression in the lung adenocarcinoma stem cell and normal lung stem cell are obviously different.

ObjectiveTo investigate the effects and problems of problem-based learning ( PBL ) teaching methods that are adopted in the laboratory medicine practice teaching. MethodsOne hundred and four undergraduate students of 5-year system of laboratory medicine were selected to use the PBL teaching methods during the laboratory medicine practice. ResultsIt showed that the PBL teaching methods obtained good probation effect. But teachers and students are required to make greater efforts in PBL teaching mode than in traditional mode, and the teaching methods was also needed to be consummated.ConclusionsUsing the problem-based teaching methods the comprehensive ability of the student is enhanced. Therefore it deserves to be generalized during laboratory medicine practice teaching.

Objective To investigate the clinical application value of genechip detection system in the mycobacterial species iden-tification and drug resistance analysis .Methods The specimens of sputum ,punctured pus ,pleural and abdominal ascites ,cerebro-spinal fluid and so on were performed the Mycobacterium DNA detection by using the gene chip technique .Then Mycobacterium tuberculosis positive samples were further performed the drug-resistant analysis .Meanwhile the Ziehl-Neelsen acid-fast staining was adopted to detect the sample .The positive rates were compared between the two groups .And TB-IGRA was used to examine the tubercle bacillus infection in partial patients .Results In 4402 samples ,137 cases (3 .36% ) of M ycobacterium tuberculosis (MTB) and 11 cases(7 .4% ) of non-tuberculosis mycobacterium(NTM) were detected .Puncture solution ,bronchoalveolar lavage fluid and tissue specimen had higher positive rate .In the 137 positive M TB samples by rifampicin-resistant gene rpoB ,isoniazide-re-sistant gene katG and inhA detection ,22 cases of resistance gene mutations were detected ;the positive rate of genechip for detecting sputum ,cerebrospinal fluid ,hydrothorax and ascites was higher than that of acid-fast staining .TB-IGRA detection had higher pos-itive rate of TB infection than genechip .Conclusion The genechip detection system can directly conduct Mycobacterium identifica-tion and drug resistance analysis ,which is especially suitable for sputum ,cerebrospinal fluid ,hydrothorax and ascites samples ,and which is simple and rapid with higher sensitivity and good specificity .