Objective:To construct a risk assessment index system for occupational disease hazards in the automotive repair industry using the Delphi method, providing a scientific basis and systematic evaluation framework for occupational hazard management in this sector.Methods:In January 2024, an expert survey method was employed to identify occupational hazard risk indicators through in-depth expert discussions. A multidimensional and hierarchical assessment system was designed based on the two core elements of "comprehensive prevention-on-site hazards."Results:The consultation results from 20 authoritative experts demonstrated that the expert authority coefficient (0.84), coordination coefficient (0.73), and reliability coefficient (0.83) all reached robust levels. The importance scores of the indicators (ranging from 3.47 to 5.59 points) exhibited clear discriminative validity. Ultimately, an assessment system comprising 2 first-level indicators, 5 second-level indicators, and 14 third-level indicators was established.Conclusion:The index system developed in this study demonstrates high scientific rigor and practical applicability. It provides a systematic evaluation tool for the hierarchical management and targeted prevention of occupational disease hazards in the automotive repair industry, offering both theoretical support and practical guidance for occupational hazard risk control in this field.

Objective:To construct a risk assessment index system for occupational disease hazards in the automotive repair industry using the Delphi method, providing a scientific basis and systematic evaluation framework for occupational hazard management in this sector.Methods:In January 2024, an expert survey method was employed to identify occupational hazard risk indicators through in-depth expert discussions. A multidimensional and hierarchical assessment system was designed based on the two core elements of "comprehensive prevention-on-site hazards."Results:The consultation results from 20 authoritative experts demonstrated that the expert authority coefficient (0.84), coordination coefficient (0.73), and reliability coefficient (0.83) all reached robust levels. The importance scores of the indicators (ranging from 3.47 to 5.59 points) exhibited clear discriminative validity. Ultimately, an assessment system comprising 2 first-level indicators, 5 second-level indicators, and 14 third-level indicators was established.Conclusion:The index system developed in this study demonstrates high scientific rigor and practical applicability. It provides a systematic evaluation tool for the hierarchical management and targeted prevention of occupational disease hazards in the automotive repair industry, offering both theoretical support and practical guidance for occupational hazard risk control in this field.

Abstract：Objective To investigate the morphological features of the Pneumocystis jirovecii, in order to facilitate early detection and rapid diagnosis of this rare pathogen from a morphology point of view by laboratory technicians. By analyzing the laboratory features and application value of different pathogen detection methods in the diagnosis of Pneumocystis jirovecii pneumonia, we aim to provide the most reliable diagnostic basis for rapid diagnosis of Pneumocystis jirovecii pneumonia.Methods A retrospective analysis was conducted on the test results of bronchoalveolar lavage fluid samples from a comprehensive hospital in Zhangqiu District, Jinan City, Shandong Province, and a hospital in Changde City from April 2022 to October 2022. Five confirmed cases of Pneumocystis jirovecii pneumonia were detected. Its clinical manifestations, laboratory results, and morphological characteristics of pathogens under different stains were analyzed to discuss the advantages and disadvantages of different detection methods. Results Cytological examination of bronchoalveolar lavage fluid found the trophozoites and cysts of Pneumocystis jirovecii by Wright's-Giemsa staining in 4 cases (80%), and the cysts of Pneumocystis jirovecii by Silver hexamine staining in 4 cases (80%), while the metagenomic next-generation sequencing confirmed all the 5 positive results. All 5 patients had different degrees of reduction in the absolute count of peripheral blood lymphocytes, and the serum lactic dehydrogenase and (1-3)-β-D-Glucan were increased. Among the 5 patients in this study, 4 were treated with sulfamethoxazole combined with caspofungin, and 1 was treated with sulfamethoxazole. Three patients were cured and discharged from hospital after treatment, but two died. Conclusions The method of Wright's-Giemsa staining for the cytological examination of bronchoalveolar lavage fluid to find Pneumocystis jirovecii has the unique and irreplaceable advantages as silver staining. Metagenomic next-generation sequencing can further increase the positive detection rate of Pneumocystis jirovecii. The combination of cytological examination of bronchoalveolar lavage fluid with metagenomic nextgeneration sequencing is a powerful diagnostic method for rapid diagnosis of Pneumocystis jirovecii pneumonia, which can diagnose accurately and reduce missed diagnosis.

Study of the mechanical properties of in vivo corneal materials is an important basis for further study of corneal physiological and pathological phenomena by means of finite element method. In this paper, the elastic coefficient ( ) and viscous coefficient ( ) of normal cornea and keratoconus under pulse pressure are calculated by using standard linear solid model with the data provided by corneal visualization scheimpflug technology. The results showed that there was a significant difference of and between normal cornea and keratoconus cornea ( < 0.05). Receiver operating characteristic curve analysis showed that the area under curve (AUC) for , and their combined indicators were 0.776, 0.895 and 0.948, respectively, which indicated that keratoconus could be predicted by and . The results of this study may provide a reference for the early diagnosis of keratoconus and avoid the occurrence of keratoconus after operation, so it has a certain clinical value.
Area Under Curve ; Cornea ; physiology ; Elasticity ; Humans ; Keratoconus ; pathology ; ROC Curve ; Viscosity

Objective To compare the adverse reaction′s incidence of oxaliplatin with three different injection ways , to explore the most appropriate infusion .Methods A total of 90 patients were randomly divided into 3 groups averagely: peripheral vein ( PV ) group, central venous catheterization ( CVC ) group and peripherally inserted central catheter ( PICC) group.The occurrence rate and degree of adverse reaction were compared among groups including peripheral neuritis , blood system , digestive system toxicity .Results The occurrence rates of peripheral neuritis were 37.50%, 21.43%, 10.00% in the PV group, CVC group and PICC group, and the difference was statistically significant (χ2 =6.628,P<0.05).The occurrence rates of toxic action of blood system and digestive system were respectively 53.13%, 53.57%, 50.00%and 78.13%, 92.86%, 73.33%in the PV group, CVC group and PICC group with no statistical difference (χ2 =0.090, 3.892,respectively;P>0.05).Conclusions The best method of oxaliplatin infusion among these three ways is PICC, followed by CVC, and PV is not recommended.

This study was aimed to evaluate the biocompatibility of Hydroxyapatite/High density polyethylene (HA/ HDPE) nano-composites artificial ossicle. The percentage of S-period cells were detected by flow cytometry after L929 cells being incubated with extraction of the HA/HDPE nano-composites; the titanium materials for clinical application served as the contrast. In addition, both materials were implanted in animals and the histopathological evaluations were conducted. There were no statistically significant differences between the two groups (P >0.05). The results demonstrated that the HA/HDPE nano-composite artificial ossicle made by our laboratory is of a good biocompatibility and clinical application outlook.
Animals ; Biocompatible Materials ; chemistry ; Bone Substitutes ; chemistry ; Durapatite ; chemistry ; Ear Ossicles ; Female ; Implants, Experimental ; Male ; Materials Testing ; Mice ; Nanoparticles ; chemistry ; Polyethylene ; chemistry ; Swine

This study was aimed to evaluate the biocompatibility of metal powder injection molding (MIM) 316L stainless steel. The percentage of S-period cells was detected by flow cytometry after L929 cells being incubated with extraction of MIM 316L stainless steel, and titanium implant materials for clinical application were used as control. In addition, both materials were implanted in animals and the histopathological evaluations were carried out. The statistical analyses show that there are no significant differences between the two groups (P > 0.05), which demonstrate that MIM 316L stainless steel has good biocompatibility.
Animals ; Biocompatible Materials ; chemistry ; Cell Line ; Fibroblasts ; cytology ; Implants, Experimental ; Materials Testing ; methods ; Mice ; Stainless Steel ; chemistry ; Swine

Hydroxyapatite nanoparticles were prepared in low Ca/P ratio by a kind of electrodeposition-hydrothermal process. The suspension of nanoparticles was cultured with SGC-7901 cells; metabolically active cells were evaluated by MTT analysis. Cells grew well and the nanoparticles in the concentration range of 10-100 microg/ml had no adverse effect on the cell viability. The results show that the nanoparticles have excellent biocompatibility with cells. Agrose gel electrophoresis analysis demonstrated that the nanoparticles had the potential to adsorb EGFP-N1 at the pH ranging between 2 to 7. Nanoparticle-DNA complex could transfer EGFP-N1 into the SGC-7901 cells, and the confocal microscopy analysis revealed that the cells with green fluorescence showed the efficiency of nanoparticle uptake to be about 80% of the efficiency of the Lipofectmine TM 2 000 uptake. In vivo, nanoparticles and DNA-nanoparticle complex were injected into mice respectively via tail-vein, and the mice grew well in two weeks. The liver, kidney, and brain of the mice were sampled and detected with electron microscopy, and all of these exhibited biodistribution of nanoparticles. This study demonstrates that Hydroxyapatite nanoparticles could be used as gene carriers.
Animals ; Biocompatible Materials ; Calcium Phosphates ; chemistry ; Drug Carriers ; chemistry ; Durapatite ; chemistry ; Genetic Therapy ; methods ; Mice ; Nanostructures ; Stomach Neoplasms ; pathology ; Transfection ; Tumor Cells, Cultured

Objective To observe the therapeutic effect on the treatment of avascular necrosis of femoral head by core decompression with autograft of mesenchymal stem cells(MSCs).Methods Nineteen patients with avascular necrosis of femoral head,including 8 cases of phase I,6 cases of phase II and 5 cases of phase III based on ARCO classification,were treated with core decompression with autograft of MSCs.Results The patients were followed up for one year.The average ratio of necrosis zone diminished from 31.88% to 13.18%.The Harris hip score was increased significantly.Conclusion The treatment of core decompression with autograft of MSCs is safe and effective,and it deserves to application in early necrosis of femoral head.