ObjectiveTo investigate the modifiable areal unit problem （MAUP） in the spatial pattern of Pseudostellaria heterophylla production regions and reveal the impact of statistical scales on the spatial distribution characteristics of this medicinal plant species. MethodsUsing multi-source data （literature records， field surveys， and statistical data）， we systematically analyzed the spatial patterns across three administrative levels （provincial， prefectural， and county scales）. Spatial autocorrelation （Moran's I） analysis， high-low clustering （Getis-Ord General G）， and hot/cold spot analysis （Getis-Ord Gi*） were employed. ResultsThe literature-based analysis showed that the production regions of P. heterophylla presented random distribution on the provincial scale and significant aggregation on the prefectural scale. The field survey data showed that the production regions displayed random distribution on the provincial scale but significant aggregation on both prefectural and county scales. The statistical data revealed that the production regions lacked spatial autocorrelation on the provincial scale but demonstrated significant aggregation on prefectural and county scales. ConclusionMAUP effects have substantive implications for understanding and decision-making in the arrangement of medicinal plant production regions. The county scale proves to be the most sensitive and explanatory level for analyzing the spatial pattern of P. heterophylla production regions， providing a critical foundation for habitat modeling， suitability evaluation， and ecological cultivation planning of medicinal plants.

BACKGROUND:At present,the use of a locking bone plate combined with steel wire or steel cable for the treatment of periprosthetic femoral fracture often adopts monocortical fixation,which is not stable and the proximal end of the bone cannot be achieved anatomically fitted by plate.The customized anatomical plate system can effectively solve this problem. OBJECTIVE:To explore the biomechanical strength of a customized anatomical plate system in fixation of Vancouver BI periprosthetic femoral fracture. METHODS:CT thin layer scanning data of normal femurs of 1 006 cases were selected and input into the MIMICS 21.0 software to establish the three-dimensional reconstruction model of the femur,which was set as the three-dimensional reconstruction group.56 complete human femoral specimens were selected as the femoral specimen group.The measured results of the two groups for femoral anatomical appearance were compared.If there was no significant difference between the two groups,the approximate appearance of a customized anatomical plate system was designed based on the measurement results in MIMICS 21.0 software and NX11.0 software.The customized anatomical plate system was designed and prepared according to the above measurement results.Eight pairs of frozen human femurs were selected to make Vancouver BI periprosthetic femoral fracture,which of the left were thin layer scanned by dual-source CT to obtain data.The data were transferred to determine the customized anatomical plate system model by the above design software.Eight sets of customized anatomical plate systems were ultimately produced,relying on the instrument company.The eight pairs of models were numbered 1-8.The left side was fixed with the customized anatomical plate system(customized anatomical plate system group);the right side was fixed with a metal locking plate system-large locking plate(claw plate group).L1-L4 and R1-R4 were subjected to vertical short-cycle loading test and vertical loading test.L5-L8 and R5-R8 were subjected to horizontal short-cycle loading test and four-point bending test.The vertical loading test and four-point bending test were used to collect bending load,bending displacement,and bending strain.Two short cycle loading tests were used to collect strain displacement to compare the maximum load,maximum displacement,bending stiffness,and short-period displacement resistance of the two kinds of bone plates. RESULTS AND CONCLUSION:(1)There were no significant differences in all indexes between the three-dimensional reconstruction group and the femoral specimen group(P>0.05).Individual customized anatomical plate system was designed based on the measurement results combined with digital software.(2)In the vertical loading test,the maximum load was higher(P=0.015),the maximum bending displacement was smaller(P=0.014),and the bending stiffness was higher(P=0.005)in the customized anatomical plate system group compared with the claw plate group.(3)In the four-point bending test,the maximum load was higher(P=0.023),the bending stiffness was higher(P=0.005),and the maximum bending displacement was not significant(P=0.216>0.05)in the customized anatomical plate system group compared with the claw plate group.(4)In the vertical short-cycle loading test,the average level of bending displacement in the customized anatomical plate system group(0.23±0.10 mm)was significantly lower than that in the claw plate group(0.44±0.02 mm)(P<0.05).(5)There was no significant difference in the average level of bending displacement between the two groups in the horizontal short cycle loading test(P>0.05).(6)It is concluded that the customized anatomical plate system has personalized anatomical characteristics,and the fixation of Vancouver BI periprosthetic femoral fracture is more stable,which has certain significance for clinical treatment.

Objective·To explore the effects and possible molecular mechanisms of nanoplastics(NPs)on severe asthma.Methods·A mouse model of severe asthma was established by using house dust mite(HDM)and lipopolysaccharide(LPS)co-stimulation.Polystyrene nanoplastics(PS-NPs)were instilled into the severe asthma mice's airways.Subsequently,bronchoalveolar lavage fluid(BALF)was collected and lung tissue sections were prepared.Flow cytometry,hematoxylin-eosin(H-E)staining,periodic acid-Schiff(PAS)staining,immunohistochemistry,and terminal dexynucleotidyl transferase-mediated dUTP nick-end labeling(TUNEL)staining,were used to observe the effects of PS-NPs on airway inflammation,mucus secretion,alveolar structure,and the proliferation and apoptosis of alveolar type Ⅱ epithelial cells(AT2 cells)in severe asthma mice.The CCK-8 assay and Annexin Ⅴ/PI double staining were performed to evaluate the effects of PS-NPs on the proliferation and apoptosis of the mouse AT2 cell line MLE-12.DNA damage in AT2 cells caused by PS-NPs was detected by using anti-γ-H2A.X immunofluorescence staining.The expression of genes in the ATR/Chk1/p53 signaling pathway was detected by real-time fluorescent quantitative polymerase chain reaction(qPCR),Western blotting,Tyramide signal amplification(TSA)multiplex immunofluorescence staining,and immunofluorescence co-localization,respectively.The ATR-specific inhibitor Ceralasertib(AZD6738)was administrated to MLE-12 cells in combination with PS-NPs to evaluate the recovery effect on cell proliferation and apoptosis.Results·Flow cytometry revealed that exposure to PS-NPs increased the total number of inflammatory cells and the number of each type of inflammatory cells in the BALF of mice with severe asthma,with a predominance of neutrophils.H-E and PAS staining showed significant increase in airway inflammatory cell infiltration and mucus secretion,as well as disruption of alveolar structure.In vitro,the CCK-8 assay demonstrated significant,dose-dependent inhibition of MLE-12 cell proliferation by PS-NPs.The Annexin V/PI double staining assay indicated a higher apoptosis rate of(56.20±3.84)%in PS-NP-exposed cells compared to(23.22±2.52)%in the control group.Immunofluorescence staining demonstrated that PS-NPs were phagocytosed by MLE-12 cells and localized around the nucleus.TUNEL staining confirmed enhanced apoptosis in AT2 cells in vivo.The immunofluorescence assay revealed that compared to the control group,the expression of the DNA damage marker γ-H2A.X increased in the experimental group.qPCR,Western blotting,and TSA multiplex staining results showed that PS-NP-induced elevated expression of mRNA and proteins was related to the ATR/Chk1/p53 pathway in MLE-12 cells.Moreover,immunofluorescence co-localization also confirmed the induction of ATR and p53 proteins in AT2 cells in vivo.The ATR-specific inhibitor Ceralasertib partially restored the PS-NP-induced inhibition of cell proliferation and enhancement of apoptosis in MLE-12 cells.Conclusion·NPs exposure leads to DNA damage in AT2 cells,activating the ATR/Chk1/p53 signaling pathway and exacerbating airway inflammation and alveolar damage in mice with severe asthma.

Objective To grasp the main environmental factors affecting the growth of Astragalus membranaceus(Fisch.)Bge.var.mongholicus(Bge.)Hsiao;To predict the distribution of suitable areas of Astragalus membranaceus(Fisch.)Bge.var.mongholicus(Bge.)Hsiao in Shanxi Province;To provide references for the rational distribution of the resources in Shanxi Province.Methods This study utilized the sample point longitude and latitude information collected in the"Fourth Survey of Chinese Materia Medica Resources"database in Shanxi Province.The data were supplemented by searching the China Digital Herbarium and retrieving related literature records.347 sample points distribution data and environmental factors were added to the MaxEnt model.The main environmental factors and contribution rates affecting the geographical distribution of Astragalus membranaceus(Fisch.)Bge.var.mongholicus(Bge.)Hsiao were screened out.The ArcGIS software was used to divide the ecological suitable area of Astragalus membranaceus(Fisch.)Bge.var.mongholicus(Bge.)Hsiao in Shanxi Province.Results The area under the ROC curve of the established MaxEnt model was 0.909,indicating that the model prediction results were accurate.The model screened 19 environmental factors.Among them,climate factor was the most important environmental factor,followed by biological factor and topographic factor,and soil factor had the least influence.The potential suitable areas of Astragalus membranaceus(Fisch.)Bge.var.mongholicus(Bge.)Hsiao in Shanxi Province were mainly distributed in the northern mountainous areas,presenting a trend of gradually decreasing suitability levels from north to south.Under the current climate conditions,the most suitable area for Astragalus membranaceus(Fisch.)Bge.var.mongholicus(Bge.)Hsiao in Shanxi Province was 15 424 km2,the suitable area was 19 856 km2,the sub suitable area was 59 436 km2,and the unsuitable area was 61 894 km2.Conclusion Based on MaxEnt model and ArcGIS software,this study predicts the distribution of suitable areas of Astragalus membranaceus(Fisch.)Bge.var.mongholicus(Bge.)Hsiao in Shanxi Province,which has certain reference value for the protection and rational distribution of Astragalus membranaceus(Fisch.)Bge.var.mongholicus(Bge.)Hsiao resources in Shanxi Province.

Objective To establish ecological suitability zone of Forsythia suspensa(Thunb.)Vahl in Shanxi Province;To study the quality regionalization of Forsythia suspensa(Thunb.)Vahl from different producing areas in Shanxi Province;To provide reference for reasonable planting and wild tending of Forsythia suspensa(Thunb.)Vahl.Methods Maximum entropy(MaxEnt)model and ArcGIS software were used to study the ecological suitability of Forsythia suspensa(Thunb.)Vahl in Shanxi Province;By screening the main environmental factors and combining them with the content of forsythoside and forsythoside A in Forsythia suspensa(Thunb.)Vahl of different regions,a quality zoning of Forsythia suspensa Thunb.Vahl medicinal materials in Shanxi Province based on forsythoside,forsythoside A and environmental factors was constructed.Results The ecological suitable areas of Forsythia suspensa Thunb.Vahl in Shanxi Province were mainly distributed in the southern part of Shanxi Province,mainly in Linfen,Yuncheng,Changzhi,and Jincheng.The general contents of forsythoside and forsythoside A in the Forsythia suspensa(Thunb.)Vahl medicinal material were gradually reduced from southern part to northern part of Shanxi Province.The comprehensive quality was high in southern part of Shanxi Province,mainly in Linfen,Changzhi,Yuncheng and Jincheng.Conclusion The results of this study are consistent with the actual survey.The southern part of Shanxi province is a suitable planting area for high quality Forsythia suspensa(Thunb.)Vahl,which provides a reference for the standardized planting and wild tending of Forsythia suspensa(Thunb.)Vahl.

OBJECTIVE To observe the changes of static functional connectivity(sFC) and dynamic functional connectivity(dFC) of amygdala subregions in patients with bilateral idiopathic tinnitus and hearing loss(TINHL). METHODS The resting-state functional magnetic resonance imaging(fMRI) data of 30 patients with bilateral tinnitus and hearing loss and 37 normal controls(NCs) were collected to analyze the intensity changes of sFC and dFC in 8 subregions of amygdala and the whole brain in TINHL patients. RESULTS There were no significant differences in age,sex and education between the two groups. Compared with the NCs group,the sFC intensity of the right basolateral subregion and right cerebellar peduncle 1 region,the left basolateral subregion and left orbital medial frontal gyrus and left angular gyrus in TINHL group was significantly decreased. The dFC intensity of left amygdalostriatal subregion and left precuneus in TINHL group was increased,but the dFC intensity was reduced in the left basolateral subregion and right angular gyrus as well as between the right superficial subregion and right medial orbital of superior frontal gyrus. CONCLUSION Among the 8 subregions of amygdala,the bilateral basolateral subregions,the left amygdalostriatal subregion and the right superficial region shown abnormal functional connectivity with other regions of the brain,which are the important parts of emotional abnormalities in TINHL.

Objective To monitor the susceptibility of clinical isolates to antimicrobial agents in tertiary hospitals in major regions of China in 2022.Methods Clinical isolates from 58 hospitals in China were tested for antimicrobial susceptibility using a unified protocol based on disc diffusion method or automated testing systems.Results were interpreted using the 2022 Clinical &Laboratory Standards Institute(CLSI)breakpoints.Results A total of 318 013 clinical isolates were collected from January 1,2022 to December 31,2022,of which 29.5％were gram-positive and 70.5％were gram-negative.The prevalence of methicillin-resistant strains in Staphylococcus aureus,Staphylococcus epidermidis and other coagulase-negative Staphylococcus species(excluding Staphylococcus pseudintermedius and Staphylococcus schleiferi)was 28.3％,76.7％and 77.9％,respectively.Overall,94.0％of MRSA strains were susceptible to trimethoprim-sulfamethoxazole and 90.8％of MRSE strains were susceptible to rifampicin.No vancomycin-resistant strains were found.Enterococcus faecalis showed significantly lower resistance rates to most antimicrobial agents tested than Enterococcus faecium.A few vancomycin-resistant strains were identified in both E.faecalis and E.faecium.The prevalence of penicillin-susceptible Streptococcus pneumoniae was 94.2％in the isolates from children and 95.7％in the isolates from adults.The resistance rate to carbapenems was lower than 13.1％in most Enterobacterales species except for Klebsiella,21.7％-23.1％of which were resistant to carbapenems.Most Enterobacterales isolates were highly susceptible to tigecycline,colistin and polymyxin B,with resistance rates ranging from 0.1％to 13.3％.The prevalence of meropenem-resistant strains decreased from 23.5％in 2019 to 18.0％in 2022 in Pseudomonas aeruginosa,and decreased from 79.0％in 2019 to 72.5％in 2022 in Acinetobacter baumannii.Conclusions The resistance of clinical isolates to the commonly used antimicrobial agents is still increasing in tertiary hospitals.However,the prevalence of important carbapenem-resistant organisms such as carbapenem-resistant K.pneumoniae,P.aeruginosa,and A.baumannii showed a downward trend in recent years.This finding suggests that the strategy of combining antimicrobial resistance surveillance with multidisciplinary concerted action works well in curbing the spread of resistant bacteria.

Hydrogels/therapeutic use* ; Tissue Engineering ; Gelatin ; Intervertebral Disc/surgery* ; Methacrylates ; Tissue Scaffolds

Heme/metabolism* ; Cryoelectron Microscopy ; Membrane Transport Proteins ; Escherichia coli Proteins/metabolism*

Objective To establish a quantitative polymerase chain reaction(PCR)method for the analysis of human-derived SRY DNA in mouse tissues,and to study the tissue distribution of human umbilical cord mesenchymal stem cells(HUCMSCs)in immunodeficient NOG mice after a single intravenous injection.Methods We established a quantitative PCR method for the analysis of human SRY DNA in mouse tissues,and validated the standard curve,linear range,accuracy,precision,and stability.Thirty-six NOG mice(18 male,18 female)were administered 3.5×107 HUCMSCs/kg by single intravenous injection.Six mice were then anesthetized and dissected after blood collection(EDTA anticoagulation)at 6,12,24,and 72 h,and at 1 and 2 weeks,respectively.DNA was extracted from lung,kidney,heart,liver,brain,spinal cord,stomach,small intestine,fat,skin,spleen,testis,uterus,and ovary tissues,and the distribution of HUCMSCs in each tissue was determined by the validated quantitative PCR method for detecting the human-derived SRY gene in mouse tissues.In addition,18 NOG mice(9 male,9 female)were divided into control(n = 6)and treatment groups(n = 12)injected intravenously with 0.9%sodium chloride and 3.5×107 cells/kg,respectively.Acute toxic reactions were observed during the administration period,and four animals were dissected at 72 h and at 2 and 4 weeks after administration to observe the gross organs.Mitochondrial protein expression was detected in paraffin sections of lung tissues by immunohistochemistry to analyze the colonization of HUCMSCs in lung tissues.Results The established RT-qPCR method for human-derived SRY DNA in mouse tissues met the validation criteria for each index.After a single intravenous injection in NOG mice,HUCMSCs were mainly distributed in the lungs and blood within 1 week after administration,with higher concentrations in lung tissues than in blood.The concentrations of HUCMSCs in lung tissue and blood remained relatively stable within 6～24 h and 6～72 h,respectively,and then decreased over time.The distribution of HUCMSCs in other tissues was not measured at all sampling points.The colonization result showed that HUCMSCs were detected in lungs 72 h after intravenous injection,but not at 2 and 4 weeks.No obvious acute toxicity was observed in NOG mice after single intravenous administration of HUCMSCs.Conclusions The above method for analyzing the distribution of HUCMSCs in mouse tissue is reliable and feasible.HUCMSCs were mainly distributed in lung and blood in NOG mice within 1 week after a single intravenous injection,and mainly colonized lung tissue at 72 h.A single intravenous administration of HUCMSCs has a good safety profile.