The soft environment is the subsystem of the university moral education environment system,including the university spirit,academia environment,human environment, system environment and network environment. The soft environment construction has the important value in the university moral education,which not only provides the base for the university students to develop morals amd creates their intrinsic demand for morals but also affects the university moral education activities. It is the objective foundation for carrying out such activities and affects the decision-making and the effect of activities.

【Objective】 To explore the HBV infection of initially reactive but discriminatory test non-reactive (NAT suspicious) samples of voluntary blood donors after PANTHER individual nucleic acid testing (ID-NAT) in Tianjin. 【Methods】 From January to August 2021, after routine testing and PANTHER ID-NAT, a total of 66 HBsAg-NAT reactive but discriminatory test non-reactive samples(referred to as NAT suspicious samples) were tested from 69 362 blood samples. Among which, 23 samples were selected by simple random sampling method and enriched by ultra-high speed centrifugation. HBV DNA was detected by supersensitive fluorescence quantification PCR (qPCR)and ID-NAT, and electrochemiluminescence was supplemented for two and half pairs of hepatitis B detection. 【Results】 Among 23 suspicious NAT samples, 14 were confirmed HBV DNA positive by serological and molecular biological tests, and the anti-HBc positive rate of HBV infected individuals was 92.8%. 92.8% (13/14) of the infected individuals were occult hepatitis B virus infection(OBI). A total of 10 samples were detected for viral load by qPCR, of which 5 were quantifiable, with viral load of (11~464) IU/mL and a median of 15.4 IU/mL. 【Conclusion】 60% of the NAT suspicious samples were detected as HBV DNA positive. Anti-HBc testing can exclude most OBI undetectable by NAT, and the sensitivity of NAT should be improved to ensure the safety of blood transfusion.

Achilles Tendon ; Ankle Injuries ; Humans ; Rupture ; Tendon Injuries/therapy* ; Treatment Outcome

【Objective】 To establish deferral criterion of HIV ELISA (enzyme-linked immunosorbent assay) and electrochemiluminescence immunoassay(ECLIA) by using receiver operating characteristic curve(ROC) method to screen HIV reactive blood donors suitable for entering the re-entry process and improve the management efficiency of reactive blood donors. 【Methods】 The test results of 92 001 blood donors from February to September 2019 were analyzed, and 177 reactive samples were screened by conventional screening mode (twice ELISA and once nucleic acid), supplemented with electrochemiluminescence immunoassay assay (ECLIA), and confirmed by Western blotting (WB). Screening reactive samples were divided into three groups: group A was both serological and nucleic acid reactivity, group B was only serological reactive, and group C was only nucleic acid reactivity. Its efficacy in blood donor classification was assessed by drawing ROC curves with 99% specific corresponding S/CO low values as the deferral criterion of the corresponding serological method. 【Results】 1) A total of 177 HIV reactive samples were detected in conventional mode, including 34 in group A, 142 in Group B and 1 in Group C. The positive predictive value (PPV) was 100%, 0.75% and 100%, respectively. ECLIA detection mode (once ECLIA and once NAT), a total of 67 HIV reactive samples including 34 in group A, 32 in group B and 1 in group C, with positive predictive values of 100%, 3.7% and 100%, respectively.2) The HIV test results showed diversity, with 36 true positive samples including 1 HIV elite controller and 3 early HIV infections (1 HIV ELISA antigen/antibody window and 2 ELISA HIV antibody window), and 32 serological and NAT cases were reactive infections.3) The deferral limit of ELISA 1 and ELISA 2 in conventional screening mode were 20.25 and 9.85, respectively, can screen 97.14% (34/35) of all true positive samples in group A and B, except for one ELISA HIV antibody window (ELISA 2 reactivity). The positive predictive values were 93.94% and 92.85%, respectively. The ECLIA deferral limit of 7.83 can screens all true positive samples in Groups A and B (35/35)in ECLIA mode. The positive predictive value was 94.59%. 【Conclusion】 The establishment of deferral limits in this study can effectively screen HIV-positive blood donors, and the number of screened blood donors is greatly reduced, which is helpful to fine and scientific management of HIV-reactive blood donors. The deferral limit values of different testing reagents are quite different, so each laboratory should choose appropriate testing methods to establish the deferral limit values suitable for the laboratory according to its own testing ability, so as to provide technical support for optimizing the process of returning blood donors to the team.

【Objective】 To compare the analytical performance of Tigris, Panther, ChiTaS BSS1200 and cobas S201 system to see if they satisfy the requirements of blood screening and to know the concordance of the results presented by these four systems. 【Methods】 According to the relevant documents of ISO15189 and Standard Operating Procedure of Blood Station(2019), the parameters needed to be verified for nucleic acid tests(NAT) included: analytical sensitivity verification, system compare test, anti-jamming capability and anti-cross-contamination ability. 【Results】 The 95% detection limits of Tigris, Panther, ChiTaS BSS1200 and Cobas S201 for HBV-DNA(IU/mL), HIV-RNA(IU/mL) and HCV-RNA(IU/mL) were 2.013 vs 4 vs 2.995 vs 0.99, 13.039 vs 10.21 vs 30.952 vs 32.24, and 2.278 vs 2.077 vs 12.008 vs 3.39, respectively. In the performance comparison verification between NAT systems, the results of the two sets of Tigris systems were in full accordance with serum plate, with a concordance rate of 100%, Kappa value of 1, and none cross-contamination.The concordance rate of No.1 Panther system was 100%, and No.2 98%, with Kappa value of 0.961 and none cross-contamination. Hemolytic samples (5g/L Hb concentration) and lipemic blood samples (13.81 mmol/L TG concentration) had no significant effect on the detection of low-concentration samples. 【Conclusion】 No significant differences in the performance of NAT systems were notable by devices, as the four systems were fully automated with high sensitivity, which can fully satisfy the blood screening requirements. Panther system demonstrates superior analysis sensitivity in HCV-RNA/HIV-RNA and lower in HBV DNA, but also in required criteria, as compared to Tigris system. Neither hemolysis nor lipemic blood had any significant effect on the test results.

OBJECTIVE: To review the research progress of design of bone scaffolds with different single cell structures. METHODS: The related literature on the study of bone scaffolds with different single cell structures at home and abroad in recent years was extensively reviewed, and the research progress was summarized. RESULTS: The single cell structure of bone scaffold can be divided into regular cell structure, irregular cell structure, cell structure designed based on topology optimization theory, and cell structure designed based on triply periodic minimal surface. Different single cell structures have different structural morphology and geometric characteristics, and the selection of single cell structure directly determines the mechanical properties and biological properties of bone scaffold. It is very important to choose a reasonable cell structure for bone scaffold to replace the original bone tissue. CONCLUSION Bone scaffolds have been widely studied, but there are many kinds of bone scaffolds at present, and the optimization of single cell structure should be considered comprehensively, which is helpful to develop bone scaffolds with excellent performance and provide effective support for bone tissue.
Bone and Bones ; Tissue Scaffolds

OBJECTIVE: To summarize the influence of microstructure on performance of triply-periodic minimal surface (TPMS) bone scaffolds. METHODS: The relevant literature on the microstructure of TPMS bone scaffolds both domestically and internationally in recent years was widely reviewed, and the research progress in the imfluence of microstructure on the performance of bone scaffolds was summarized. RESULTS: The microstructure characteristics of TPMS bone scaffolds, such as pore shape, porosity, pore size, curvature, specific surface area, and tortuosity, exert a profound influence on bone scaffold performance. By finely adjusting the above parameters, it becomes feasible to substantially optimize the structural mechanical characteristics of the scaffold, thereby effectively preempting the occurrence of stress shielding phenomena. Concurrently, the manipulation of these parameters can also optimize the scaffold's biological performance, facilitating cell adhesion, proliferation, and growth, while facilitating the ingrowth and permeation of bone tissue. Ultimately, the ideal bone fusion results will obtain. CONCLUSION The microstructure significantly and substantially influences the performance of TPMS bone scaffolds. By deeply exploring the characteristics of these microstructure effects on the performance of bone scaffolds, the design of bone scaffolds can be further optimized to better match specific implantation regions.
Tissue Scaffolds/chemistry* ; Tissue Engineering/methods* ; Bone and Bones ; Porosity

Adaptive wavelet neural network intelligent ECG detection is a method in which the wavelet function substitutes for the effective function of connotative layer in the neural network. Time-shift and scale parameter may be adjusted by the neural network. Therefore wavelet neural network may improve the detection rate and reliability of ECG signal.
Algorithms ; Computer Simulation ; Electrocardiography ; Neural Networks (Computer) ; Nonlinear Dynamics ; Signal Processing, Computer-Assisted

The latest diagnosis and treatment plan (4th edition) of 2019 novel coronavirus pneumonia has been issued. The diagnosis and treatment plan highlights the concept of integrated traditional Chinese and Western medicine, and Xuebijing injection was referred for three times. Xuebijing injection was successfully developed based on the theory of 'three syndromes and three methods'. The theory of 'three syndromes and three methods' is a theoretical system of integrated traditional Chinese and Western medicine on critical diseases proposed by Professor Wang Jinda and his team in the 1970s, and it is one of the main contents of Wang Jinda's academic thought. The theory of 'three syndromes and three methods' has a deep foundation of traditional Chinese medicine theory, and it is still being continuously enriched and improved. It is also supported by multiple evidence-based data. Therefore, 'three syndromes and three methods' has rich theoretical connotation and tenacious vitality.