Objective To study the difference in fibrinogen and D-dimer between the patients with ST-ele-vation myocardial infarction (STEMI) and those with normal angiography of coronary artery.Methods 100 patients with STEMI who underwent PCI and 100 patients with normal coronary arteriograms as controls from Jan.2005 to Dec.2007 were studied.Plasma concentrations of fibrinogen and D-dimer were compared.Results There was no significant difference in gender, age, history of hypertension and diabetes and smoking between the two groups.Plas-ma concentration of fbfinogen(Fg) was higher in control group [(2.65±0.68 )g/L ] than STEMI group [(2.38±0.91)g/L] (P<0.05).The square root of plasma concentration of D-dimer was higher in STEMI group [(13.23±5.08) μg/L] than control group [(9.40±5.03)μg/L ] (P<0.01).The square root of the rate between D-dimer and fibrinogen was higher in STEMI group (9.11±4.13 ) than control group (5.92±3.35 ) (P<0.01).Conclusion The levels of fibrinogen in patients with STEMI are significantly lower than that of control group, and D-dimer is higher in the former group than in the latter group, suggesting that fresh thrombosis and secondary fibrinolysis exit in STEMI patients at the acute stage.

Objective To investigate the breakfast behaviors and nutritional quality among primary and secondary students,and to provide scientific evidence for developing intervention strategies.Method Random three-stage clustering sampling method was employed in the study.A questionnaire survey was conducted among 9194 primary and secondary students aged 6-17y,from seven cities in China.Results The rates of primary and secondary students having breakfast everyday were 97.0%,92.4%,and 93.4%,Most of the students had their breakfast within 30 min after getting up,the rates being 75.4%,74.7%,and 68.6% respectively.Mothers primarily cook breakfast for the students,the rates being 53.1%,49.9%,and 49.7% respectively.In most cases,they had breakfast at home,the rates being 71.8%,67.0%,and 63.8% respectively.The rates of students having poor quality breakfast were above 80%.Conclusion Primary and secondary students are one of the focal target people for preventing unhealthy dietary behaviors due to shortcomings of eating breakfast.It is necessary to improve the nutritional quality of breakfast for better health of students.

This paper constructs numerical models of bioprosthetic heart valve and blood. The fluid solid interaction is carried out using penalty function method. The mechanical property of the bioprosthetic heart valve during cardiac cycle is simulated with ANSYS software. Results show that the Von Mises stress concentrates at the junction of attachment edge and coaptation edge. The open time of bioprosthetic heart valve is consistent with that of actural measurement. The peak velocity of blood is in the range of physiology. This model provides more realistic mechanical property of bioprosthetic heart valve during cardiac cycle compared to pure solid model, and facilitates design and optimization of bioprosthetic heart valve.
Bioprosthesis ; Heart Valve Prosthesis ; Heart Valves ; Humans ; Models, Cardiovascular ; Prosthesis Design

Objective To establish an animal model of calpastatin ( CAST) transgenic mice by inserting the full hu-man CAST into the genome of C57BL/6J mice.Methods Recombinant transgenic vector pRP .EX3d-EF1A-CAST-IRES-eGFP was constructed by Gateway technology .It was injected into the fertilized eggs from C 57BL/6J mice.The injected eggs were transplanted into the oviduct of pseudopregnant mice .Tail DNA PCR screening was performed to identify the positive founder mice.The expressions of CAST mRNA and protein in tissues of the transgenic mice were detected by RT -PCR and Western blotting.Results Ninty eggs were transplanted into the oviducts of 3 recipients.The transplantation success rate was 100%.23 viable offsprings were born from the recipients .Tail DNA PCR screening showed that two of the offsprings were positive transgenic mice .The positive rate of transgenic mice was 9%.RT-PCR assay revealed that CAST mRNA ex-pressions were present in the heart , liver, kidney, lung, spleen, brain and skeletal muscle of the transgenic mice .Addition-ally, the CAST protein expression was significantly increased in the transgenic mice .Conclusion CAST transgenic mice have been successfully established and provide a good animal model support for further studies on the CAST function .

To investigate the presence of integrated Epstein-Barr virus (EBV) DNA in the NK/T cell lymphoma (NKTCL) ge-nome and analyze the integration information in the genome of NKTCL cell lines. Methods: PCR and in situ hybridization were used to detect EBV infection in five EBV (+) NK/T samples and four EBV (-) NK/T samples provided by the biobanks of the First Affiliated Hospi-tal of Zhengzhou University. Whole-genome DNA of the samples was sequenced and subjected to bioinformatics analysis. Whole-ge-nome sequence alignment was used to identify the EBV integration sequence. BLAST analysis was used to compare EBV fasta files of the samples and EBV fasta library. CREST software was used to extract softclip reads, filter all paired reads, and enumerate their distri-bution on chromosomes. The integrated genomics viewer (IGV) was used to compare the distribution of reads in partial regions of chromosome. PCR was used to amplify the high-frequency integration region of the EBV DNA. The amplified fragments were sanger se-quenced. Results: EBV DNA and EBER expression were detected in five EBV (+) NK/T samples but not in the four EBV (-) NK/T samples. Sequencing depth, coverage depth, proportion of coverage, and proportion of alignment all met the requirements for subsequent re-search. Sequence alignment revealed that the captured sequences were viral sequences. Filtered reads were most numerous in EBV (+) NKTCL cell line SNK, YTS, and EBV (+) nasal NKTCL tissue. The reads were non-randomly enriched in chromosome 2. EBV DNA inte-gration in the 400 bp region of chr2:30234084-30234483 caused insertion or deletion in the chr2p23.1 site. Conclusions: EBV DNA is highly integrated in the chr2p23.1 site of EBV (+) NKTCL cells and may affect the expression of related genes.

Objective: To investigate the expression and clinical significance of programmed death-ligand 1 (PD-L1), programmed death-ligand 2 (PD-L2), and their receptor programmed cell death protein 1 (PD-1) in EBV-positive T/NK lymphoproliferative disease [Epstein-Barr virus-positive T/natural killer (NK)-cell lymphoproliferative disease, EBV(+)-T/NK-LPD]. Methods: The pathological paraffin-embedded tissues of 17 patients with EBV(+)-T/NK-LPD from the First Affiliated Hospital of Zhengzhou University from January 2013 to December 2017 were collected. These patients include 12 males and 5 females, aged 10-82 years old, the average age being 29 years, 4 people in gradeⅠ, 7 in gradeⅡ, 3 in gradeⅢ, and 3 people with hydroa vacciniforme-like lymphoproliferative disorders. Immunohistochemical SP method was used to detect the expression of PD-1, PD-L1, and PD-L2 in human EBV(+)-T/NK-LPD tissues. The relationship between PD-1, PD-L1, PD-L2 expression, and clinicopathological parameters, pathological grades and prognosis were analyzed by Fisher's exact probabilities and Spearman rank correlation. Result: After statistical analysis, the results showed that in 17 cases of tissue samples, there were 12 cases with positive PD-1 expression, 6 cases with positive PD-L1 expression and 5 cases with positive PD-L2 expression. There was no significant correlation between PD-1 and PD-L2 expression and prognosis (P>0.05). PD-L1 expression showed a positive correlation with prognosis (P<0.05). There was no significant correlation between the expression of PD-L1 and PD-L2 with age, sex, as well as LDH and Ki-67 levels (P>0.05). Moreover, there was no significant correlation of PD-1 and PD-L2 expression with pathological grade (r=0.141, r=-0.149, both P>0.05). However, there was a negative correlation between the PD-L1 expression and pathological grade (r=-0.563), and the correlation between the PD-L1 ex-pression and pathological grade was statistically significant (P<0.05). Conclusions: PD-1, PD-L1, and PD-L2 are abnormally expressed in the pathological tissues of EBV(+)-T/NK-LPD. Although there was no significant correlation between the expression of PD-1 and prognosis or pathological grade, it was significantly higher in EBV+T/NK-LPD. PD-1/PD-Ls associated signaling pathway is expected to be a potential new target for EBV(+)-T/NK-LPD immunotherapy.