This paper designed a pressure swing adsorption(PSA)oxygen production equipment in mobile cabin of container,and a dual-tower type of oxygen producer was adopted.The inside of container included some major components,such as air compressor,filters,adsorption dryer,purifier,air buffer tank,oxygen generator,process tank,oxygen compressor,and an oxygen tank,and it adopted a unique circular structure with compact layout,which can optimize the work parameters of oxygen production equipment in mobile cabin of container,and provide convenience for installation and maintenance in the inside of the container,and provide continuously and stably qualified oxygen.At the same time,the DYSP intelligent control system was adopted,which can realize remote control,data acquisition,and parameter settings,and other operations.Compared with infrastructure installation of oxygen production equipment,the PSA oxygen production equipment in mobile cabin of container has a series of advantages,such as convenient displacement,small footprint and fast use.It can enhance control efficiency of oxygen production equipment,and reduce labor costs.It has wide applicability to hospitals,mobile cabin hospitals,factories that need oxygen,which are temperately established and need be emergently used.

Objective To report a case of Elizabethkingia anopheles(E.anopheles)-associated sepsis and menin-gitis,review the relevant literatures,and provide reference for the diagnosis and treatment of this infection.Methods Treatment process of a pediatric patient aged 11-year-7-month old who developed post-neurosurgery E.anophe-les-associated sepsis and meningitis was analyzed retrospectively.Relevant literature was reviewed to summarize clinical characteristics of patients with E.anopheles-associated sepsis or meningitis.Results The main clinical manifestations of this pediatric patient were fever and abnormal cerebrospinal fluid routine.The cerebrospinal fluid and blood cultures showed E.anopheles.Patient recovered after vancomycin treatment.Including this case,a total of 33 cases were analyzed,with 16 males and 1 unreported gender.The median age of patients was 49 years old(range:1 day-84 years).Most cases were healthcare-associated infections(62.5％,n=20)with underlying disea-ses,and 24 cases were cured.Conclusion E.anopheles-associated infections are rare in clinic,but can cause severe infections such as sepsis and meningitis,warranting clinical attention.

Objective:To investigate the clinical characteristics and major allergens of patients with pollen-food allergy syndrome（PFAS） and their correlation with the severity of symptoms, and to provide a basis for identifying high-risk patients, optimizing the allergen testing process and developing individualized dietary management strategies. Methods:The clinical data of 166 patients with PFAS admitted to our hospital from January 2021 to July 2023 were retrospectively analyzed. The clinical symptoms, pollen types and food allergy of the patients were analyzed by questionnaire survey and serum specific IgE detection. phi coefficient, Apriori algorithm modeling and multivariate logistic regression analysis were used to evaluate the association between allergen and symptom severity. Results:Artemisia pollen was the most common allergen in this area, with a positive rate of 96.39%. Peach and mango were the most common food allergens, which caused allergic reactions in 24.10% and 22.89% of patients, respectively. Oral mucosal symptoms were the main symptoms. Correlation analysis showed that there was a correlation between pollen allergens and allergenic food. Association rule analysis showed that when the patient was allergic to the combination of peanuts and trees, the probability of high severity of symptoms was 82.35%. Multivariate analysis showed that ragweed allergy was significantly positively correlated with the severity of PFAS symptoms. Conclusion:Artemisia pollen and related food allergens play an important role in the pathogenesis of PFAS. Association rule mining and network map analysis revealed direct associations between peanut and tree combination allergy and symptom severity, as well as potential links between other inhaled allergens and specific food allergies. Ragweed and peach allergy are independent risk factors for the aggravation of PFAS symptoms, which can be used as early warning indicators. These results help to improve the screening of high-risk patients and the construction of regional allergen databases.
Humans ; Food Hypersensitivity/immunology* ; Allergens/immunology* ; Retrospective Studies ; Pollen/immunology* ; Cross Reactions ; Immunoglobulin E/blood* ; Rhinitis, Allergic, Seasonal/immunology* ; Artemisia/immunology* ; Male ; Female ; Adult ; Prunus persica/immunology* ; Arachis/immunology* ; Middle Aged ; Surveys and Questionnaires ; Oral Allergy Syndrome

This paper designed a pressure swing adsorption(PSA)oxygen production equipment in mobile cabin of container,and a dual-tower type of oxygen producer was adopted.The inside of container included some major components,such as air compressor,filters,adsorption dryer,purifier,air buffer tank,oxygen generator,process tank,oxygen compressor,and an oxygen tank,and it adopted a unique circular structure with compact layout,which can optimize the work parameters of oxygen production equipment in mobile cabin of container,and provide convenience for installation and maintenance in the inside of the container,and provide continuously and stably qualified oxygen.At the same time,the DYSP intelligent control system was adopted,which can realize remote control,data acquisition,and parameter settings,and other operations.Compared with infrastructure installation of oxygen production equipment,the PSA oxygen production equipment in mobile cabin of container has a series of advantages,such as convenient displacement,small footprint and fast use.It can enhance control efficiency of oxygen production equipment,and reduce labor costs.It has wide applicability to hospitals,mobile cabin hospitals,factories that need oxygen,which are temperately established and need be emergently used.

Objective To report a case of Elizabethkingia anopheles(E.anopheles)-associated sepsis and menin-gitis,review the relevant literatures,and provide reference for the diagnosis and treatment of this infection.Methods Treatment process of a pediatric patient aged 11-year-7-month old who developed post-neurosurgery E.anophe-les-associated sepsis and meningitis was analyzed retrospectively.Relevant literature was reviewed to summarize clinical characteristics of patients with E.anopheles-associated sepsis or meningitis.Results The main clinical manifestations of this pediatric patient were fever and abnormal cerebrospinal fluid routine.The cerebrospinal fluid and blood cultures showed E.anopheles.Patient recovered after vancomycin treatment.Including this case,a total of 33 cases were analyzed,with 16 males and 1 unreported gender.The median age of patients was 49 years old(range:1 day-84 years).Most cases were healthcare-associated infections(62.5％,n=20)with underlying disea-ses,and 24 cases were cured.Conclusion E.anopheles-associated infections are rare in clinic,but can cause severe infections such as sepsis and meningitis,warranting clinical attention.

Objective To determine whether local gradient fluid shear stress(FSS)causes a specific distribution of intracellular calcium ion concentration,which ultimately determines the direction of cell migration.Methods Numerical simulations were performed using COMSOL software.The method of staining intracellular calcium ion for RAW264.7 osteoclast precursors was established.After applying gradient FSS on the cells,the distribution and dynamic changes of intracellular calcium ion concentration and cell migration parameters were analyzed.Results Osteoclast precursors tended to migrate towards regions with lower FSS,and oscillatory flow regulated the distribution of intracellular calcium ions along the direction of cell migration.After blocking phospholipase C(PLC),mechanosensitive cation-selective channels(MSCC),endoplasmic reticulum(ER),and removing extracellular calcium,the migration speed of cells towards the low FSS direction was significantly reduced,but the migration speed along the liquid flow direction was significantly enhanced.Meanwhile,the calcium ion distribution along the liquid flow direction was significantly increased.Conclusions Osteoclast precursors can sense the FSS gradient,resulting in a specific distribution of intracellular calcium ions along the direction of migration.This ultimately leads to the migration of osteoclast precursors towards regions with lower FSS.This study provides important basic data for ultimately elucidating the cellular and molecular mechanisms of bone tissue remodeling under dynamic external forces.

Objective:To explore the prevalence and independent associated factors of vascular calcification (VC) in non-dialysis chronic kidney disease (CKD) patients of stage 3-5.Methods:It was a single-center cross-sectional observational study. Non-dialysis stage 3-5 CKD patients ≥18 years old who were admitted to the Department of Nephrology, the First Affiliated Hospital of Sun Yat-sen University from May 1, 2022 to December 31, 2022 with VC evaluation were enrolled. The patients' general information, laboratory examination and imaging data were collected. Coronary artery calcification (CAC), thoracic aorta calcification (TAC), abdominal aorta calcification (AAC), carotid artery calcification and aortic valve calcification (AVC) were evaluated by cardiac-gated electron-beam CT (EBCT) scans, lateral lumbar x-ray, cervical macrovascular ultrasound and echocardiography, respectively. The differences in clinical data and the prevalence of VC at different sites of patients with different CKD stages were compared, and the prevalence of VC at different sites of patients in different age groups [youth group (18-44 years old), middle-aged group (45-64 years old) and elderly group (≥65 years old)] and patients with or without diabetes were compared. Multivariate logistic regression analysis was used to analyse the independent associated factors of VC for different areas.Results:A total of 206 patients aged (51±14) years were included, including 129 (62.6%) males. There were 44 patients with CKD stage 3 (21.4%), 51 patients with CKD stage 4 (24.8%), and 111 patients with CKD stage 5 (53.9%). CKD was caused by chronic glomerulonephritis [104 cases (50.5%)], diabetic kidney damage [35 cases (17.0%)], hypertensive kidney damage [29 cases (14.1%)] and others [38 cases (18.4%)]. Among 206 patients, 131 (63.6%) exhibited cardiovascular calcification, and the prevalence of CAC, TAC, AAC, carotid artery calcification, and AVC was 37.9%, 43.7%, 37.9%, 35.9% and 9.7%, respectively. The overall prevalence of VC in young, middle-aged and elderly patients was 24.6%, 73.6% and 97.4%, respectively. With the increase of age, the prevalence of VC in each site gradually increased, and the increasing trend was statistically significant (all P<0.001). The overall prevalence of VC in CKD patients with diabetes was 92.5% (62/67), and the prevalence of VC at each site in the patients with diabetes was significantly higher than that in the patients without diabetes (all P<0.001). Multivariate logistic regression analysis revealed that age (every 10 years increase, OR=2.51, 95% CI 1.77-3.56, P<0.001), hypertension ( OR=5.88, 95% CI 1.57-22.10, P=0.009), and diabetes ( OR=4.66, 95% CI 2.10-10.35, P<0.001) were independently correlated with CAC; Age (every 10 years increase, OR=6.43, 95% CI 3.64-11.36, P<0.001) and hypertension ( OR=6.09, 95% CI 1.33-27.84, P=0.020) were independently correlated with TAC; Female ( OR=0.23, 95% CI 0.07-0.72, P=0.011), age (every 10 years increase, OR=3.90, 95% CI 2.42-6.29, P<0.001), diabetes ( OR=5.37, 95% CI 2.19-13.19, P<0.001) and serum magnesium ( OR=0.01,95% CI 0-0.35, P=0.014) were independently correlated with AAC. Moreover, age and diabetes were independently correlated with carotid artery calcification, AVC and overall VC Conclusions:The prevalence of VC in non-dialysis CKD patients of stage 3-5 is 63.59%, of which CAC reaches 37.9%, TAC is the most common one (43.7%), while AVC is the least one (9.7%). Age and diabetes are the independent associated factors for VC of all sites except TAC, while hypertension is an independent associated factor for both CAC and TAC.

Objective To express the monkeypox virus (MPXV) A23R protein in Escherichia coli and purify by Ni-NTA affinity column, and to prepare mouse antiserum against MPXV A23R. Methods The recombinant plasmid pET-28a-MPXV-A23R was constructed and transformed into Escherichia coli BL21 to induce the expression of A23R protein. After optimizing the conditions of expression, A23R protein was highly expressed. Recombinant A23R protein was purified by Ni-NTA affinity column and identified by Western blot analysis. The purified protein was used to immunize mice for preparing the A23R polyclonal antibody, and the antibody titer was detected by ELISA. Results The expression of A23R recombinant protein reached the peak under the induced conditions of 0.6 mmol/L isopropyl-β-D-thiogalactoside (IPTG), 37 DegreesCelsius and 20 hours. The purity of the protein was about 96.07% and was identified by Western blot analysis. The mice were immunized with recombinant protein, and the titer of antibody reached 1:102 400 at the 6th week after immunization. Conclusion MPXV A23R is expressed highly and purified with a high purity and its antiserum from mouse is obtained with a high titre.
Animals ; Mice ; Monkeypox virus ; Antibodies ; Enzyme-Linked Immunosorbent Assay ; Blotting, Western ; Recombinant Proteins ; Escherichia coli/genetics*

Objective By comparing the fatigue strength of type A and type B locking compression plates (LCP) in distal femoral plate, a theoretical evaluation method was provided for type selection of bone plate when testing its bending strength and fatigue performance. Methods Through bending strength performance test and fatigue performance test on bone plates with different types, combined with ANSYS Workbench, the finite element analysis on total deformation, von Mises stress and fatigue service life of bone plates were conducted. Results The fatigue strength of type A plate was 30.7% higher than that of type B plate, the stress of type A plate was lower than that of type B plate, and the minimum fatigue service life of type A plate was 17% higher than that of type B plate. Conclusions The fatigue performance of type A plate is better than that of type B plate, so the failure possibility of type A plate was lower than that of type B plate.The results provide references for assisting selection of different bone plates when testing the performance of two newly developed bone plates.

Objective:To study the effect of excessive torsion of the umbilical cord on fetal or neonatal outcomes.Methods:The observation group was selected from the puerperae who delivered in Beijing Obstetrics and Gynecology Hospital from July 2016 to June 2020 with excessive torsion of the umbilical cord. In the same period, the puerperae without excessive torsion of the umbilical cord were selected as the control group with a ratio of 1∶1. The general condition, mode of delivery, perinatal outcomes, and the effect of different umbilical coiling index (UCI) [twisted umbilical cord weeks/umbilical cord length (cm)] on fetal and neonatal outcomes were retrospectively analyzed between two groups.Results:Compared with the control group, the observation group (1 780 cases) had smaller neonatal gestational age [(37.9±3.2) weeks vs. (38.4±2.9) weeks], birth weight [(3 007±726) g vs. (3 354±616) g] and length [(48.5±4.3) cm vs. (49.6±4.1) cm], but higher incidence of fetal distress [34.9% (622/1 780) vs. 12.9% (230/1 780)], neonatal asphyxia [1.5% (26/1 780) vs. 0.7% (13/1 780)], and cord blood pH<7.20 [4.2% (75/1 780) vs. 2.8% (49/1 780)], the difference was statistically significant ( P<0.05). The UCI≥0.73 group had lower neonatal gestational age, birth weight and length, but higher incidence of cord blood pH<7.20 and neonatal asphyxia than the UCI<0.73 group, with statistically significant differences ( P<0.05). Conclusions:Excessive torsion of the umbilical cord increases the incidence of fetal hypoxia and neonatal asphyxia and has a significant effect on neonatal gestational age, birth weight and length. The higher the UCI, the greater the impact on fetus and neonate.