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Chinese Journal of Biotechnology ; (12): 811-819, 2020.
Article in Chinese | WPRIM | ID: wpr-826895


Sequencing technology has been greatly improved in terms of throughput and cost. The single-molecule nanopore DNA sequencing, one of the major branches of the third-generation sequencing technology, has made great contributions in the fields of medicine and life sciences due to its advantages of ultra-long reading length, real-time detection and direct detection of base methylation modification, etc. This article briefly describes the principle of nanopore sequencing technology, and discusses its application in clinical, animal, plant, bacterial and virus fields and its future development direction.

Animals , Base Sequence , DNA , Chemistry , Genetics , Humans , Nanopore Sequencing , Nanopores , Research , Sequence Analysis, DNA
Article in Chinese | WPRIM | ID: wpr-479636


Objective To observe and investigate the influence degree of laparoscopic operation for the postoperative body stress and inflammatory state of patients with gastric and duodenal ulcer perforation.Methods 76 patients with gastric and duodenal ulcer perforation were selected as study subjects,and they were divided into control group(conventional open operation group)and observation group(laparoscopic operation group)according to the random number table,38 cases in each group.The serum body stress hormones and antiinflammatory,proinflammatory related indexes of the two groups at first day before operation and at first,third,seventh day after operation were respectively detected and compared.Results The serum IL -2 levels of the observation group at first,third and seventh day after operation were (3.53 ±0.24)μg/mL,(3.25 ±0.22)μg/mL and (4.37 ±0.33)μg/mL,which were higher than those of the control group(F =5.876,P <0.05),while other serum body stress hormones and antiin-flammatory,proinflammatory related indexes were all obviously lower than those of the control group (all P <0.05), there were significant differences between those postoperative evaluation results of the two groups.Conclusion The influence of laparoscopic operation for the postoperative body stress and inflammatory state of patients with gastric and duodenal ulcer perforation is relatively small,and it shows that the bad body stress degree caused by the operation is relatively smaller.

Acta Pharmaceutica Sinica ; (12): 1457-62, 2012.
Article in Chinese | WPRIM | ID: wpr-432998


To investigate the effects of oleanolic acid (OA) on the proliferation, migration and the formation of tube-like structure in human vascular endothelial cells (HUVECs). MTT assay, flat plate scarification, Transwell plates and matrigel-induced tube formation assay were performed to detect the effects of OA on proliferation, migration and tube formation. MTT assay showed that the inhibition rates of HUVECs treated with 60 and 100 microg x mL(-1) of OA for 24 h were 19% and 83% respectively. Treatment of HUVECs significantly inhibited the cell migration in a dose-dependent manner. The vascular indexes of HUVECs treated with 40 and 60 microg x mL(-1) OA were 33% and 20% respectively. Western blotting analysis showed that treatment of the cells with OA significantly attenuated the expression and secretion of VEGF. Additionally, VEGF could in part reverse the effects of OA on migration and tube formation of HUVECs. In conclusion, OA inhibits the proliferation, and VEGF plays an important role in OA induced decreased migration and tube formation of HUVECs.

Virologica Sinica ; (6): 95-104, 2011.
Article in Chinese | WPRIM | ID: wpr-415328


It is well established that different sites within a protein evolve at different rates according to their role within the protein; identification of these correlated mutations can aid in tasks such as ab initio protein structure,structure function analysis or sequence alignment.Mutual Information is a standard measure for coevolution between two sites but its application is limited by signal to noise ratio.In this work we report a preliminary study to investigate whether larger sequence sets could circumvent this problem by calculating mutual information arrays for two sets of drug naive sequences from the HIV gp120 protein for the B and C subtypes.Our results suggest that while the larger sequences sets can improve the signal to noise ratio,the gain is offset by the high mutation rate of the HIV virus which makes it more difficult to achieve consistent alignments.Nevertheless,we were able to predict a number of coevolving sites that were supported by previous experimental studies as well as a region close to the C terminal of the protein that was highly variable in the C subtype but highly conserved in the B subtype.