Objective:To construct a biosafety evaluation index system for major emergency public health events in medical institutions.Methods:Based on previous laboratory biosafety evaluation work, relevant regulations and standards on biosafety in China were collected through literature research and expert consultations. Candidate indicators for constructing the biosafety evaluation system for major emergency public health events in medical institutions were selected, and a framework was established. Two rounds of expert questionnaires were conducted to determine the content of the index system based on experts′ evaluation, and each indicator′s relevance and importance were scored. Finally, two rounds of Delphi consultations were carried out, and the Analytic Hierarchy Process (AHP) was applied to calculate the weights of indicators.Results:The response rates for the total four rounds of questionnaire surveys were all 100%. The first two rounds focused on determining the framework, while the latter two focused on determining the weights for each indicator. The authority coefficients of the expert consultations for the two rounds of weights were 0.65 and 0.70, respectively, indicating the reliability of the research results. In the final round of survey, the Kendall′s coefficients of concordance at each level were all greater than 0.1. Through statistical testing, the P-values were all less than 0.05, indicating good coordination of expert opinions. Ultimately, we established an operational biosafety evaluation system for major emergency public health events in medical institutions, consisting of 4 primary indicators, 26 secondary indicators, and 119 tertiary indicators, with additional deduction items, bonus items, unacceptable items, and monitoring indicators.Conclusions:Based on scientific theory, a biosafety evaluation system for major emergency public health events in medical institutions was constructed, achieving the integration of routine and emergency measures. This system can be used for self-assessment of laboratory biosafety during emergency public health events, addressing the lack of unified standards in biosafety evaluation. Through regular self-assessment, it can enhance the level of biosafety management in medical institution laboratories, to realize the value of application and dissemination.

Objective To observe the effects of Hedysarum Polybotrys polysaccharide(HPS)on the glucose metabolism of small intestinal smooth muscle in rats with diabetic gastroparesis(DGP)of spleen qi deficiency syndrome;To explore its mechanism based on AMPK/GLUT4 signaling pathway.Methods Totally 72 male Wistar rats were randomly divided into 12 in the blank group and the remaining 60 rats were assigned to the model group.The DGP spleen qi deficiency syndrome model was replicated by intraperitoneal injection of streptozotocin+irregular feeding with high-fat and high sugar feed combined with swimming exhaustion method.The model rats were randomly divided into model group,metformin group and HPS high-,medium-and low-dosage groups.The metformin group was given 100 mg/kg metformin hydrochloride by gavage,while the HPS high-,medium-and low-dosage groups were given 200,100 and 50 mg/kg HPS by gavage,respectively.The blank group and model group were given purified water by gavage once a day for 8 consecutive weeks.The gastric emptying rate and small intestine propulsion rate in rats were detected,HE staining was used to observe the smooth muscle morphology of gastric antrum and ileal tissue,immunofluorescence staining was used to detect the expression of glucagon like peptide-1(GLP-1)in ileal tissue,ELISA was used to detect the contents of adiponectin(APN),glucagon(Glu)and insulin(INS)in serum,Western blot was used to detect the protein expressions of glucose transporter(GLUT)4,GLUT1,AMP-activated protein kinase(AMPK)and p-AMPK in ileal tissue.Results Compared with the blank group,the model group rats showed significantly increased random blood glucose,significantly decreased body mass,gastric emptying rate and small intestinal propulsion rate(P<0.01);the edema in the submucosal layer,loose arrangement of connective tissue,infiltration of a small number of lymphocytes,granulocytes and macrophages,reduced number of goblet cells in the ileal tissue,shedding of intestinal villous epithelial cells and widening of the gap between the submucosal layer and the lamina propria;the expression of GLP-1 in ileal tissue was significantly decreased(P<0.05),the contents of serum APN and INS were significantly decreased,and the content of Glu significantly increased(P<0.01),the expressions of GLUT4 and p-AMPK/AMPK proteins in ileal tissue were significantly decreased,while the expression of GLUT1 protein significantly increased(P<0.01).Compared with the model group,rats in metformin group and HPS high-dosage group showed a random decrease in blood glucose,an increase in body mass,gastric emptying rate,and small intestine propulsion rate(P<0.05,P<0.01);a more regular arrangement of gastric antral tissue cells,a reduction of shedding cells and edema,the smooth muscle structure of the ileal tissue was relatively intact,with evenly distributed cells and reduced infiltration of inflammatory cells;the expression of GLP-1 in ileal tissue increased,the contents of serum APN and INS increased,and the content of Glu decreased,the expressions of GLUT4 and p-AMPK/AMPK proteins in ileal tissue increased,while the expression of GLUT1 protein decreased(P<0.05,P<0.01).Conclusion HPS may up-regulate GLUT4 and down-regulate GLUT1 expression through activates AMPK,promotes glucose uptake and utilization by small intestinal smooth muscle,and improves glucose metabolism of DGP rats with spleen qi deficiency syndrome.

OBJECTIVE To preliminarily assess the horizontal sound localization and its influencing factors in patients with unilateral sudden sensorineural hearing loss during the acute phase.METHODS The azimuth discrimination test and azimuth identification test were completed,with the speech sound(65 dB SPL)as the stimulus.The minimum audible angle(MAA)and root-mean-square error(RMSE)were obtained,and the RMSE of the affected side and the healthy side were calculated respectively.According to the WHO(2021)hearing loss classification criteria,the data were analyzed based on the pure-tone average(PTA)of the affected ear.And the best resident hearing at each frequency of the affected ear was recorded.RESULTS The performance of the unilateral sudden sensorineural hearing loss patients in the sound localization varied greatly.Some performed close to the normal level,while others completely lost the ability to localize sound.The RMSE of the moderate hearing loss group(≥35 dB HL)was significantly higher than that of the normal hearing group(P<0.01),the MAA of the moderate to severe hearing loss group(≥50 dB HL)showed statistically significant differencescompared with normal hearing group(P<0.001).The RMSE of the affected side of patients in the severe and above hearing loss group was significantly larger than that of the healthy side.Regression analysis showed that the best resident hearing at each frequency of the affected ear was the most significant factor affecting MAA(R2=0.572,P<0.001)and RMSE(R2=0.768,P<0.001).CONCLUSION The horizontal sound localization of unilateral sudden sensorineural hearing loss patients in the acute phase varies greatly.When the PTA of the affected side reaches moderate hearing loss,the localization ability is significantly lower than that of normal-hearing individuals.The best resident hearing at each frequency of the affected ear is the key factor affecting the localization ability.

Saponins associated with Panax notoginseng (P. notoginseng) demonstrate significant therapeutic efficacy across multiple diseases. However, certain high-yield saponins face limited clinical applications due to their reduced pharmacological efficacy. This study synthesized and evaluated 36 saponin-1,2,3-triazole derivatives of ginsenosides Rg1/Rb1 and notoginsenoside R1 for anti-adipogenesis activity in vitro. The research revealed that the ginsenosides Rg1-1,2,3-triazole derivative a17 demonstrates superior adipogenesis inhibitory effects. Structure-activity relationships (SARs) analysis indicates that incorporating an amidyl-substituted 1,2,3-triazole into the saponin side chain via Click reaction enhances anti-adipogenesis activity. Additionally, several other derivatives exhibit general adipogenesis inhibition. Compound a17 demonstrated enhanced potency compared to the parent ginsenoside Rg1. Mechanistic investigations revealed that a17 exhibits dose-dependent inhibition of adipogenesis in vitro, accompanied by decreased expression of preadipocytes. Peroxisome proliferator-activated receptor γ (PPARγ), fatty acid synthase (FAS), and fatty acid binding protein 4 (FABP4) adipogenesis regulators. These findings establish the ginsenoside Rg1-1,2,3-triazole derivative a17 as a promising adipocyte differentiation inhibitor and potential therapeutic agent for obesity and associated metabolic disorders. This research provides a foundation for developing effective therapeutic approaches for various metabolic syndromes.
Adipogenesis/drug effects* ; Triazoles/chemical synthesis* ; Ginsenosides/chemical synthesis* ; Saponins/chemical synthesis* ; Animals ; Mice ; Structure-Activity Relationship ; PPAR gamma/genetics* ; 3T3-L1 Cells ; Adipocytes/metabolism* ; Panax notoginseng/chemistry* ; Drug Design ; Molecular Structure ; Humans ; Cell Differentiation/drug effects* ; Fatty Acid-Binding Proteins/genetics*

Objective:To construct a biosafety evaluation index system for major emergency public health events in medical institutions.Methods:Based on previous laboratory biosafety evaluation work, relevant regulations and standards on biosafety in China were collected through literature research and expert consultations. Candidate indicators for constructing the biosafety evaluation system for major emergency public health events in medical institutions were selected, and a framework was established. Two rounds of expert questionnaires were conducted to determine the content of the index system based on experts′ evaluation, and each indicator′s relevance and importance were scored. Finally, two rounds of Delphi consultations were carried out, and the Analytic Hierarchy Process (AHP) was applied to calculate the weights of indicators.Results:The response rates for the total four rounds of questionnaire surveys were all 100%. The first two rounds focused on determining the framework, while the latter two focused on determining the weights for each indicator. The authority coefficients of the expert consultations for the two rounds of weights were 0.65 and 0.70, respectively, indicating the reliability of the research results. In the final round of survey, the Kendall′s coefficients of concordance at each level were all greater than 0.1. Through statistical testing, the P-values were all less than 0.05, indicating good coordination of expert opinions. Ultimately, we established an operational biosafety evaluation system for major emergency public health events in medical institutions, consisting of 4 primary indicators, 26 secondary indicators, and 119 tertiary indicators, with additional deduction items, bonus items, unacceptable items, and monitoring indicators.Conclusions:Based on scientific theory, a biosafety evaluation system for major emergency public health events in medical institutions was constructed, achieving the integration of routine and emergency measures. This system can be used for self-assessment of laboratory biosafety during emergency public health events, addressing the lack of unified standards in biosafety evaluation. Through regular self-assessment, it can enhance the level of biosafety management in medical institution laboratories, to realize the value of application and dissemination.

Objective To investigate the differences in cortical activation and functional connectivity during speech under different cognitive loads in young individuals.Methods Twenty-one participants(mean age 21.9±1.33 years)were instructed to read short sentences embedded with color words under both congruent(where the color words matched the font color)and incongruent(where the color words did not match the font color)condi-tions.The color words required reading the font color instead of the word itself.Functional near-infrared spectros-copy(fNIRS)was utilized to analyze differences in cortical activation(changes in HbO concentration)and functional connectivity(Pearson correlation of HbO between brain regions)in the dorsolateral prefrontal cortex(DLPFC)and supplementary motor area(SMA)bilaterally.Results The fNIRS results revealed significant increase in HbO con-centration changes in the RDLPFC(t=3.4,P=0.003),LDLPFC(t=2.58,P=0.019),RSMA(t=3.59,P=0.002),and LSMA(t=4.06,P=0.001)under the incongruent condition compared to the congruent condition.Additionally,there was a significant enhancement in the correlation between RDLPFC and LDLPFC(t=2.44,P=0.025).However,the differences in correlation between left and right SMA,as well as between SMA and DLPFC,were not statistically significant(P＞0.05).Conclusion These findings suggest that during speech under incongru-ent conditions,increased cognitive load leads to elevated cortical activation in the DLPFC and SMA,along with in-creased functional connectivity between the left and right DLPFC.

Objective To observe the effects of Hedysarum Polybotrys polysaccharide(HPS)on the glucose metabolism of small intestinal smooth muscle in rats with diabetic gastroparesis(DGP)of spleen qi deficiency syndrome;To explore its mechanism based on AMPK/GLUT4 signaling pathway.Methods Totally 72 male Wistar rats were randomly divided into 12 in the blank group and the remaining 60 rats were assigned to the model group.The DGP spleen qi deficiency syndrome model was replicated by intraperitoneal injection of streptozotocin+irregular feeding with high-fat and high sugar feed combined with swimming exhaustion method.The model rats were randomly divided into model group,metformin group and HPS high-,medium-and low-dosage groups.The metformin group was given 100 mg/kg metformin hydrochloride by gavage,while the HPS high-,medium-and low-dosage groups were given 200,100 and 50 mg/kg HPS by gavage,respectively.The blank group and model group were given purified water by gavage once a day for 8 consecutive weeks.The gastric emptying rate and small intestine propulsion rate in rats were detected,HE staining was used to observe the smooth muscle morphology of gastric antrum and ileal tissue,immunofluorescence staining was used to detect the expression of glucagon like peptide-1(GLP-1)in ileal tissue,ELISA was used to detect the contents of adiponectin(APN),glucagon(Glu)and insulin(INS)in serum,Western blot was used to detect the protein expressions of glucose transporter(GLUT)4,GLUT1,AMP-activated protein kinase(AMPK)and p-AMPK in ileal tissue.Results Compared with the blank group,the model group rats showed significantly increased random blood glucose,significantly decreased body mass,gastric emptying rate and small intestinal propulsion rate(P<0.01);the edema in the submucosal layer,loose arrangement of connective tissue,infiltration of a small number of lymphocytes,granulocytes and macrophages,reduced number of goblet cells in the ileal tissue,shedding of intestinal villous epithelial cells and widening of the gap between the submucosal layer and the lamina propria;the expression of GLP-1 in ileal tissue was significantly decreased(P<0.05),the contents of serum APN and INS were significantly decreased,and the content of Glu significantly increased(P<0.01),the expressions of GLUT4 and p-AMPK/AMPK proteins in ileal tissue were significantly decreased,while the expression of GLUT1 protein significantly increased(P<0.01).Compared with the model group,rats in metformin group and HPS high-dosage group showed a random decrease in blood glucose,an increase in body mass,gastric emptying rate,and small intestine propulsion rate(P<0.05,P<0.01);a more regular arrangement of gastric antral tissue cells,a reduction of shedding cells and edema,the smooth muscle structure of the ileal tissue was relatively intact,with evenly distributed cells and reduced infiltration of inflammatory cells;the expression of GLP-1 in ileal tissue increased,the contents of serum APN and INS increased,and the content of Glu decreased,the expressions of GLUT4 and p-AMPK/AMPK proteins in ileal tissue increased,while the expression of GLUT1 protein decreased(P<0.05,P<0.01).Conclusion HPS may up-regulate GLUT4 and down-regulate GLUT1 expression through activates AMPK,promotes glucose uptake and utilization by small intestinal smooth muscle,and improves glucose metabolism of DGP rats with spleen qi deficiency syndrome.

BACKGROUND:The elastic modulus of traditional solid titanium alloy implants is higher than that of human bone,and the resulting"stress shielding"phenomenon may affect the osseointegration of implants.Simultaneously,the wettability of 3D printed titanium alloy surface needs to be improved.OBJECTIVE:To prepare hydrophilic Gyroid implants with excellent biomechanical properties.METHODS:The 3D models of Gyroid implant,solid implant,mandibular bone and crown were established,and the mechanical properties of different implants were analyzed by finite element analysis.The Gyroid structure implant model was imported into the 3D printer to make the Gyroid structure implant materialized,and then the hydrophilic Gyroid structure implant with excellent mechanical properties and surface activity was prepared by sandblasting acid etching and ultraviolet functionalization.The morphology and hydrophilicity of 3D printed Ti6Al4V specimens before and after surface modification were analyzed by scanning electron microscopy and contact angle test.RESULTS AND CONCLUSION:(1)The finite element analysis results showed that under the vertical average bite force,the Gyroid structure could uniformly disperse the load acting on the implant into the entire structure.The load on the solid structure implant could only be dispersed on its outer surface and concentrated in the neck.The maximum equivalent stress of the Gyroid structure implant was 200.67 MPa,which did not exceed 50%of the yield strength of Ti6Al4V material.The maximum equivalent stress of the Gyroid structure implant on the surrounding bone tissue was 24.27 MPa,which was slightly higher than the maximum equivalent stress of the solid structure implant 17.32 MPa,and in the range of 20-60 MPa.The stimulation effect of the Gyroid structure implant on new bone formation was better than that of the solid structure implant.(2)The 3D printing technology could materialize the Gyroid structure implant model.Scanning electron microscopy showed that there were many unmelted spherical metal particles on the surface of the 3D printed Ti6Al4V specimens.After sandblasting and acid etching,a micron-scale mesh pore structure was formed on the surface,and no protruding metal particles were seen.The surface morphology of the superimposed UV functional treatment group was basically consistent with that after sandblasting and acid etching.The contact angle test results showed that the surface hydrophilicity of the specimens treated with ultraviolet functionalization plus sandblasting and acid etching was better than that of the sandblasting and acid etching and non-surface treatment groups.(3)The sandblasting and acid etching technology can remove the weakly connected metal particles on the 3D printed specimen and improve the similarity between the solid model and the design model.On this basis,the ultraviolet functionalization treatment can significantly improve the hydrophilicity of the 3D printed Gyroid structure implant surface without affecting its structure.

Objective To evaluate the value of radiomics models and comprehensive models based on multiparametric magnetic resonance imaging(mpMRI)in predicting the expression of human epidermal growth factor receptor 2(HER2)in bladder cancer(BCa).Methods A total of 76 pathologically confirmed BCa patients undergoing pelvic mpMRI during Jan.2022 and Nov.2024 at the Affiliated Zhongda Hospital of Southeast University were retrospectively included.After the volume of interest(VOI)was sketched,7 modal features were obtained,including T2WI,DWI,DCE,T2WI+DWI,T2WI+DCE,DWI+DCE,and T2WI+DWI+DCE,which were analyzed with logistic regression to obtain the predictive values.After that,the best sequences were screened with receiver operating characteristic(ROC)curves,and then combined with support vector machine,logistic regression,K-nearest neighbor,plain Bayes and adaptive enhancement,to construct the radiomics prediction models.Logistic regression analysis was used to screen the predictors of high HER 2 expression and to construct a comprehensive prediction model and a nomogram.Finally,decision curve analysis(DCA)was used to quantify the clinical benefits.Results Among the radiomics models based on the T2WI+DWI+DCE sequence,the AdaBoost model demonstrated the best predictive performance,with area under the ROC curve(AUC)being 0.863(95％CI:0.807-0.920)in the training set and 0.716(95％CI:0.601-0.830)in the validation set.Based on radiomics features and clinical imaging characteristics,logistic regression analysis identified tumor pedicle and risk group as the predictors of high HER2 expression.The comprehensive prediction model based on the two factors achieved the AUC of 0.869(95％CI:0.772-0.965)in the training set and 0.875(95％CI:0.712-0.986)in the validation set.Conclusion The radiomics model based on the T2WI+DWI+DCE sequence has high accuracy in predicting HER2 expression,outperforming single-sequence models.The nomogram based on the comprehensive prediction model has high clinical decision-making efficacy and is useful for non-invasive identification of HER2 expression.

Objective To explore the evaluation of the relationship between myocardial damage and left ventricular diastolic function in patients with acute myocardial infarction(AMI)by using cardiovascular MR T2WI sequences.Methods A total of 155 AMI patients were selected.All patients were divided into two groups based on whether left ventricular diastolic dysfunction occurred,including diastolic dys-function group and diastolic normal group.Clinical data of all patients,myocardial injury and cardiac function indicators at admis-sion,black blood T2 short time inversion recovery(T2-STIR)sequence of cardiac MR,and T2 prepulse steady state free procession during free breathing(T2 p-SSFP)sequence images of bright blood were collected.Pearson’s method was used to analyze the rela-tionship between T2WI sequences and myocardial injury as well as cardiac function indicators.Multivariate logistic regression analysis was used to evaluate the influencing factors of left ventricular diastolic dysfunction.Receiver operating characteristic(ROC)curve was used to analyze the diagnostic efficacy of cardiovascular MR T2WI sequences in left ventricular diastolic dysfunction.Results Com-pared with the T2-STIR sequence,the T2 p-SSFP sequence showed a significant decrease in the signal-to-noise ratio(SNR)of the dis-tal myocardial,the SNR of the edematous myocardial,and the contrast-to-noise ratio(CNR)of the edematous myocardial and the dis-tal myocardial(P<0.05).The distal myocardial SNR,edematous myocardial SNR,and edematous myocardial and distal myocardial CNR of T2WI sequences were positively correlated with cardiac troponin I(c Tn I),creatine kinase isoenzyme MB(CK-MB),myoglobin(MB),and left ventricular ejection fraction(LVEF),respectively(P<0.05).Compared with diastolic normal group,patients in diastolic dysfunction group had significantly higher distal myocardial SNR,edematous myocardial SNR,and edematous myocardial and distal myocardial CNR in the T2-STIR and T2 p-SSFP sequences(P<0.05).Logistic regression analysis showed that distal myocardial SNR,edematous myocardial SNR,and edematous myocardial and distal myocardial CNR were risk factors for left ventricular diastolic dysfunction in AMI patients(P<0.05).The ROC curve analysis showed that the distal myocardial SNR,edematous myocardial SNR,and edematous myocardial and distal myocardial CNR of T2WI sequences had diagnostic value for left ventricular diastolic dysfunction in AMI patients.Conclusion Cardiovascular MR T2WI sequences exhibit significant prominence in individuals diagnosed with AMI and demonstrate a positive correlation with myocardial injury.These sequences serve as valuable tools for assessing the disease’s severity and hold substantial predictive potential concerning left ventricular diastolic dysfunction.