Based on melamine-Cu conjugate and subsequent interruption of formation of polythymine (Poly T)-templated copper nanoclusters (CuNCs), a novel fluorescent strategy was developed for detection of melamine.The method relied on the principle that the coordination of melamine to copper would be unfavorable for the reduction of Cu2+ in the poly T-CuNCs synthesis process, and thereby resulting in the decrease of fluorescence intensity of CuNCs.By this method, the fluorescence response of CuNCs displayed an linear relationship with melamine concentration in the range from 5 μmol/L to 120 μmol/L.The detection limit was 1.5 μmol/L.Furthermore, the assay was successfully applied in the detection of melamine in milk samples with good recoveries.

ABSTRACT:Objective To construct V-set and immunoglobulin domain containing 4 (Vsig4)nanobodies (Nbs) as specific macrophage probes so as to use them as molecular probes of macrophagocytes.Methods A nanobody phage library was generated by using peripheral blood lymphocytes isolated from an alpaca immunized with recombinant Vsig4 protein.After three rounds of selection against recombinant Vsig4.The Nbs were subjected to sequencing and genome alignment to obtain VHH sequence.Nbs were isolated and tested for Vsig4 specificity in an ELISA using recombinant Vsig4.The affinity capacity of Nbs was verified by the cell line stably expressing Vsig4. Results A nanobody phage library with an estimated 7.27 × 107 clones with 70% insertion was successfully constructed.Totally 1 3 6 Vsig4-positive clones were sequenced and aligned according to different CDR3 sequences. In summary,1 5 Vsig4 nanobodies were obtained and grouped into 3 different CDR3 epitopes.The affinity of representing nanobody and Vsig4 was analyzed via ELISA;Nb1 1 9 showed the highest affinity against both recombinant and native Vsig4.Conclusion We successfully constructed and screened Vsig4 specific nanobody number 1 1 9 with high affinity and specificity.It can help with macrophage detection and in vivo monitoring.

Objective To examine the effect of positive and negative evaluative conditioning (EC) on neutral faces.Methods The experiment consisted of three phases:baseline phase,conditioning phase,and re-evaluative phase,in which 41 college students participated,watching sequences of neutral faces (CS) pairing to either a positive stimulus (USpos) or a negative stimulus (USneg).Their emotional experiences (valence and arousal) and physiological reactivity (eyeblink startle reflex and skin conductance) were recor ded.Results (1) In the re-evaluative phase,CSpos was rated significantly more positive than CSneg and CSneut,while CSneg was rated significantly more negative than CSneut (CSpos (5.05± 1.24),CSneg (3.73± 1.48),CSneut (4.46± 1.04),P＜0.05).(2)In the re-evaluative phase,the mean startle eyeblink response magnitude(T score) to CSpos was significantly smaller than the responses elicited by CSneg and CSneut (CSpos (45.04±5.56),CSneg (51.44±9.30),CSneut (54.52± 10.60),P＜0.01).Conclusion The findings suggest that neutral faces can acquire valences and approach motivation through EC.

Objective To discuss the efficacy of tantalum rod implantation combined with bone transplantation in the treatment of early stage osteonecrosis of the femoral head.Methods Twenty-four male patients were re cruited.Twelve patients were allocated to the tantalum rod and bone implantation group.The mean age was 35.7 years.Twelve patients were allocated to the tantalum rod implantation group.The mean age was 33.2 years.All patients with stage Ⅱ osteonecrosis.Results All patients were followed up with an average of 42.5 ± 6.7 months.The final evaluation was made according to the last follow-up data.In the tantalum rod implantation group,the average score of pre-operation and post-operation were 65.3±6.3,82.6 ± 5.3 respectively with a statistic difference (P ＜ 0.05).Two of patients underwent total hip replacement before the end of this study,significant difference was observed in the aspect of radiographic progression (P ＜ 0.05).In the tantalum rod implantation combined with bone marrow stem cell transplantation group,the average score was 92.2 ± 1.0 with a statistic difference (P ＜ 0.05).There was no one of patients underwent total hip replacement before the end of this study.Significant difference was observed in the aspect of radiographic progression (P ＜ 0.05).Between the two groups,a significant difference was observed in clin ical symptoms in favor of the tantalum rod implantation combined with bone transplantation group(P ＜ 0.05).No significant difference was observed in the aspect of radiographic progression (P ＞ 0.05).Significant difference was observed in the aspect of survivorship of the femoral head(P ＜ 0.05).Conclusion Tantalum rod implantation combined with bone transplantation improves clinical symptoms and delay total hip arthoplasty than tantalum rod implantation.

A new dibenzocyclooctadiene lignan, renchangianin E (1) was isolated from the stems of Kadsura renchangiana. Its structure and stereochemistry were elucidated by spectroscopic methods, including 2D-NMR techniques.

Objective:Diabetic foot osteomyelitis (DFO) is not only a special and challenging problem in diabetic foot infection, but also an important reason for amputation and disability of patients with diabetic foot infection.The diagnosis of DFO usually requires the combination of information of medical history and physical examination, serum inflammatory markers and imaging findings.The results of bone tissue culture and bone histopathology are recognized as the gold standards for the diagnosis of DFO.At present, there is no optimal treatment plan and process for DFO.Comprehensive, individualized treatment and multidisciplinary cooperation should be given on the basis of full assessment to ensure the best treatment effect and improve the quality of life of patients with DFO.

ObjectiveTo investigate the effect of the Yap1 gene and tanshinone ⅡA on the proliferation, migration, and invasion abilities of Huh-7 hepatoma cells. MethodsA total of 10 pairs of human hepatocellular carcinoma (HCC) samples and adjacent tissue samples were collected in Zhongnan Hospital of Wuhan University from June 1 to December 1, 2019. Quantitative real-time PCR and Western blotting were used to measure the expression of the Yap1 gene and phenotype-related molecules. MTT cell proliferation detection reagent was used to measure the inhibition rate of cell proliferation after the treatment with different concentrations of tanshinone ⅡA. Western blotting was used to measure the changes in the expression of apoptosis-and migration-related markers after different interventions. Flow cytometry and Transwell assay were used to measure apoptosis and cell migration and invasion abilities. The data of 375 cases of liver cancer and 50 cases of relatively normal liver tissue samples were downloaded from The Cancer Genome Atlas, including clinicopathological information. The t-test was used for comparison of continuous data between two groups, and the chi-square test was used for comparison of categorical data between two groups. ResultsIn 8 of the 10 pairs of HCC samples and adjacent tissue samples, HCC samples had significantly higher expression of Yap1 than the adjacent tissue samples. Compared with the normal human liver epithelial cells L02, the Huh-7 and HCCL-M3 hepatoma cells had a significant increase in the expression of Yap1. The silencing efficiency of si-Yap1-3 transfection reached 87.004% at the protein level. MTT results showed that tanshinone ⅡA effectively inhibited the proliferation of Huh-7 cells, with a half inhibitory concentration of 8.683 μmol/L. After the cells were treated with si-Yap1-3 and tanshinone ⅡA, there was an increase in the expression of the downstream marker for proliferation and migration E-cadherin and a reduction in the expression of vimentin, and the results of Transwell assay showed that compared with the si-NC group, the tanshinone ⅡA+si-Yap1-3 group had significant reductions in the migration and invasion abilities of Huh-7 cells (migration: 43.19±2.88 vs 132.20±10.03, t=8.527, P=0.001; invasion: 53.95±4.20 vs 179.10±11.11, t=4.484, P=0.011). The group treated with si-Yap1-3 and tanshinone ⅡA had an increase in the expression of the apoptosis-related marker Bax and a reduction in the expression of Bcl-2, as well as a significantly higher early apoptosis rate than the si-NC group (2598% vs 9.21%, χ2=4.078, P＜0.05). ConclusionOncogene Yap1 silencing combined with tanshinone ⅡA can promote the apoptosis of Huh-7 hepatoma cells and inhibit their migration and invasion, which can provide certain guiding significance for clinical medication.

Objective: To develop a native adaptive behavior scale for children with autism spectrum disorder(ASD) and to explore its reliability and validity. Methods: Items of ASD adaptive behavior rating scale were selected based on the scale development theory, ASD knowledge and adaptive behavior concept through preliminary survey and statistical, and 301 ASD children aged 2 to 12 from hospitals in Guangzhou, Huizhou, Shenzhen who met the Diagnostic and Statistical Manual of Mental Disorders, Fifth Edition were selected, data was analyzed by the item analysis. Results: After item analysis and exploratory factor analysis, the final version of the scale contains 58 items, and 64.24% of the total variation could be explained by 6 factors; The Cronbach’s α coefficient of the full scale was 0.98, and the coefficient value of dimen sional factors were 0.94，0.93，0.91，0.95，0.88，0.94. The test-test reliability r of full scale was 0.86, the r of the factor were 0.88，0.81，0.81，0.87，0.88，0.79. The criterion-related validity r with the ABAS-Ⅱ scale was -0.77, the criterion-related validity r with the CARS scale was 0.64. Conclusion The ASD Child Adaptive Behavior Scale showed good reliability and validity, and could be used widely.

Objective:To investigate the clinical characteristics of E. coli peritoneal dialysis-associated peritonitis (PDAP) and the risk factors for its occurrence and treatment failure.Methods:The clinical data of patients with episodes of PDAP in four general hospitals in Jilin Province from 2013 to 2019 were retrospectively reviewed. According to the pathogenic bacteria, the patients were divided into E. coli and non- E. coli groups. The incidence of E. coli PDAP in the last seven years was calculated and the clinical characteristics were compared between two PDAP groups. Logistic regression was used to analyze the risk factors for the occurrence and treatment failure of E. coli PDAP. Results:A total of 693 PDAP episodes/cases were enrolled in this study, including 100 episodes/cases in the E. coli group and 593 episodes/cases in the non- E. coli group. The incidence rate of E. coli PDAP in the four hospitals showed a decreasing trend during 2013 to 2019. Compared with the non-E.coli group, the proportion of diabetic patients and the average blood albumin levels in the E. coli group were lower ( χ2=5.006, Z=-2.992, P<0.05), while the proportion of refractory peritonitis was higher, and the duration of antibiotic therapy was longer ( χ2=6.350, Z=-2.779, P<0.05). Multivariate Logistic regression analysis showed that history of PDAP ( OR=1.577, 95% CI: 1.015-2.448) and low baseline serum albumin level ( OR=0.958, 95% CI: 0.923-0.995) were independent risk factors for the development of E. coli PDAP, while concomitant diabetes was an independent protective factor for E. coli PDAP ( OR=0.538, 95% CI: 0.330-0.876). Moreover, long-term dialysis was an independent risk factor for treatment failure of E. coli PDAP ( OR=1.047, 95% CI: 1.018-1.076). Conclusion:The incidence rate of E. coli PDAP in study institutions has declined in the past 7 years, but the rate of refractory PDAP is still high. The history of PDAP and low blood albumin level are independent risk factors for the occurrence of E. coli PDAP, while concomitant diabetes is an independent protective factor for the occurrence of E. coli PDAP. Long-term dialysis is an independent risk factor for treatment failure of E. coli PDAP.

Objective:To evaluate the long-term health-related quality of life (QOL) in pediatric patients with acute leukemia after hematopoietic stem cell transplantation (HSCT) and to analyze potential influence factors.Methods:Patients with acute leukemia aging 8-18 years who received HSCT in the Hematology Oncology Center of Beijing Children′s Hospital from June 2009 to June 2012 with more than 80 months survival postoperatively were recruited.All of them were subjected to a short-term QOL survey in 2013.PedsQL? Transplantation Module 3.0 in Chinese mandarin version was completed.QOL data and influence factors were analyzed.Results:Forty-one patients completed the questionnaires, involving 32 males and 9 females with the mean age of(14.29±2.72) years.The mean scores of overall long-term QOL after HSCT were above 75 (total scores: 100), which was above the average.The age, disease status before transplantation, donor sources, post-transplant complications and the parental education level were the influential factors for the long-term QOL in pediatric patients with acute leukemia at post-HSCT, which could affect a certain dimension in QOL.Conclusions:The overall long-term QOL of pediatric patients with acute leukemia who survived for more than 80 months at post-HSCT is acceptable, which is significantly better than the short-term QOL after 4 months of HSCT.The age, disease status before transplantation, donor sources, post-transplant complications and the education level of parents could affect a certain dimension of QOL.