Objective To establish a noninvasive method for prenatal genetic analysis by using maternal serum and apply the method in fetal sex determination,paternity testing. Methods Samples of maternal serum from 53 pregnant women (11 to 36 weeks of gestation) were collected. The DNA extracted from each sample was amplified by using"Y-PLEX 6" amplification kit .which enabled the simultaneous analysis of six Y-STR loci including DYS393.DYS19.DYS389 II, DYS390, DYS391 and DYS385. The PCR products were detected by using ABI PrismTM 377 Sequencer and genotyped by related analysis software. Results (1) Y-STR specific alleles were detected in the maternal sera of all 29 mothers bearing male babies. Among the six Y-STR loci,specific alleles were detected in 29/29 at DYS393 locus,in 18/29 at DYS19 locus and in 10/29 at DYS390 locus. (2) Y-STR specific alleles were not detected in maternal sera of 24 pregnant women bearing female babies. (3) According to the presence of specific alleles at DYS393 locus and the value of allelic peak height and peak area, the accuracy of fetal sex determination was 100% . (4)The observed Y-STR alleles of each prenatal specimen from pregnant women with male fetuses were the same as the results of their husbands. Conclusion The assay of highly polymorphic Y-STR genotyping system developed by the authors provided a sensitive, accurate and non-invasive method to prenatal diagnosis. Our results demonstrate that fetal sex can be accurately determined and imply that paternity testing could be performed for pregnant women carrying male fetuses.

Objective To observe the regulatory effect of recombinant human DCN on the expression of HLA class Ⅰ, Ⅱ molecule on hepatoma carcinoma cell HepG2 and investigate the relatively immune mechanism of human DCN on enhancing anti-tumor effect. Methods After transfected HepG2 cells with pcDNA3.1 (+)-DCN by liposome transfection, the expression of HLA class Ⅰ , Ⅱ molecule and the apoptotic indexes were analyzed by the flow cytometer. Results The expression of HLA class Ⅰ , Ⅱ molecule on the HepG2 cells transfected with pcDNA3.1 (+)-DCN was up-regulated with the apoptosis indexes being significantly higher than that of other control groups. Conclusion The human DCN can induce HepG2 apoptosis and up-regulate the expressions of HLA class Ⅰ , Ⅱ molecule which may contribute to its antitumor effect.

Objective? To explore the clinical effects of evidence-based psychological intervention on nursing care for middle-aged patients with ischemic stroke. Methods? Totally 120 patients aged 45-59 years who were hospitalized in the Department of Neurology, Cangzhou People's Hospital between February and July were selected, and stratified into intervention (n=60) and control (n=60) groups. Patients in the control group received conventional nursing care, while patients in the intervention group received psychological intervention based on conventional nursing care. Self-Depression Scale (SDS) was used to assess the status of patients in the two groups. Results? After 4 weeks, the SDS score of the intervention group was (52.37±4.38), whereas the SDS score of the control group was (58.81±3.44). The SDS score was lower in the intervention group than in the control group, and there was statistically significant difference between the two groups (P＜ 0.01). Conclusions? The evidence-based psychological intervention model helps to ameliorate the depression in middle-aged patients with ischemic stroke, which is worthy applying and promoting in clinical practice.