ObjectiveTo explore the protective effect of Shengxiantang on cardiac function and myocardial microvascular injury in rats with chronic heart failure （CHF）. MethodsThe CHF rat model was prepared by aortic arch constriction （TAC）. Of the 72 SD rats， 8 were randomly selected as the sham operation group， where the chest was opened without ligating the aortic arch. The 40 successfully modeled rats were randomly divided into the model group， the Shengxiantang low-， medium-， and high-dose groups （5.1， 10.2， 20.4 g·kg^-1）， and the trimetazidine group （6.3 mg·kg^-1）， with 8 rats in each group. Drug administration began 4 weeks after modeling. The administration groups received the corresponding drugs by gavage， while the sham operation and model groups were given the same amount of distilled water for 8 consecutive weeks. Echocardiography was used to assess cardiac function. Enzyme-linked immunosorbent assay （ELISA） was used to detect the levels of nitric oxide （NO）， endothelin （ET-1）， vascular endothelial growth factor （VEGF）， and von Willebrand factor （vWF）. Ultrastructural changes of microvessels were observed by transmission electron microscopy. Immunohistochemistry was used to detect the expression levels of ATP synthase subunit （ATP5D） and F-actin in myocardial tissue. Western blot was used to detect the expression levels of occludin， claudin， vascular endothelial cadherin （VE-Cadherin）， and zonula occludens-1 （ZO-1）. Microvessel density was measured by immunofluorescence staining. ResultsCompared with the sham operation group， the ejection fraction （EF） and left ventricular shortening fraction （FS） in the model group were significantly decreased （P<0.01）， while the left ventricular diastolic diameter （LVIDd）， left ventricular systolic diameter （LVIDs）， left ventricular end-diastolic posterior wall thickness （LVPWd）， left ventricular end-systolic posterior wall thickness （LVPWs）， left ventricular end-diastolic volume （LVVOLd）， and left ventricular end-systolic volume （LVVOLs） were significantly increased （P<0.01）. The levels of NO and VEGF were significantly decreased （P<0.01）， while the levels of ET-1 and vWF were significantly increased （P<0.01）. Under electron microscopy， the microvascular basement membrane was incomplete and the tight junctions were blurred. The expression levels of ATP5D， F-actin， occludin， claudin， ZO-1， and VE-Cadherin were significantly decreased （P<0.05， P<0.01）， and the relative density of microvessels was significantly reduced （P<0.05， P<0.01）. After intervention with Shengxiantang， the EF and FS of CHF rats significantly increased （P<0.01）， while the LVIDd， LVIDs， LVPWd， LVPWs， LVVOLd， and LVVOLs significantly decreased （P<0.01）. The levels of NO and VEGF significantly increased （P<0.01）， while the levels of ET-1 and vWF significantly decreased （P<0.01）. Under electron microscopy， the microvascular basement membrane was relatively complete and the tight junctions were more continuous. The expression levels of ATP5D， F-actin， occludin， claudin， ZO-1， and VE-Cadherin significantly increased （P<0.05， P<0.01）， and the relative density of microvessels significantly increased （P<0.01）. ConclusionShengxiantang can effectively improve the cardiac function of CHF rats， reduce microvascular endothelial injury， strengthen the connection between endothelial cells， and increase microvessel density， thereby protecting myocardial microvascular injury.

ObjectiveTo explore the protective effect of Shengxiantang on cardiac function and myocardial microvascular injury in rats with chronic heart failure （CHF）. MethodsThe CHF rat model was prepared by aortic arch constriction （TAC）. Of the 72 SD rats， 8 were randomly selected as the sham operation group， where the chest was opened without ligating the aortic arch. The 40 successfully modeled rats were randomly divided into the model group， the Shengxiantang low-， medium-， and high-dose groups （5.1， 10.2， 20.4 g·kg^-1）， and the trimetazidine group （6.3 mg·kg^-1）， with 8 rats in each group. Drug administration began 4 weeks after modeling. The administration groups received the corresponding drugs by gavage， while the sham operation and model groups were given the same amount of distilled water for 8 consecutive weeks. Echocardiography was used to assess cardiac function. Enzyme-linked immunosorbent assay （ELISA） was used to detect the levels of nitric oxide （NO）， endothelin （ET-1）， vascular endothelial growth factor （VEGF）， and von Willebrand factor （vWF）. Ultrastructural changes of microvessels were observed by transmission electron microscopy. Immunohistochemistry was used to detect the expression levels of ATP synthase subunit （ATP5D） and F-actin in myocardial tissue. Western blot was used to detect the expression levels of occludin， claudin， vascular endothelial cadherin （VE-Cadherin）， and zonula occludens-1 （ZO-1）. Microvessel density was measured by immunofluorescence staining. ResultsCompared with the sham operation group， the ejection fraction （EF） and left ventricular shortening fraction （FS） in the model group were significantly decreased （P<0.01）， while the left ventricular diastolic diameter （LVIDd）， left ventricular systolic diameter （LVIDs）， left ventricular end-diastolic posterior wall thickness （LVPWd）， left ventricular end-systolic posterior wall thickness （LVPWs）， left ventricular end-diastolic volume （LVVOLd）， and left ventricular end-systolic volume （LVVOLs） were significantly increased （P<0.01）. The levels of NO and VEGF were significantly decreased （P<0.01）， while the levels of ET-1 and vWF were significantly increased （P<0.01）. Under electron microscopy， the microvascular basement membrane was incomplete and the tight junctions were blurred. The expression levels of ATP5D， F-actin， occludin， claudin， ZO-1， and VE-Cadherin were significantly decreased （P<0.05， P<0.01）， and the relative density of microvessels was significantly reduced （P<0.05， P<0.01）. After intervention with Shengxiantang， the EF and FS of CHF rats significantly increased （P<0.01）， while the LVIDd， LVIDs， LVPWd， LVPWs， LVVOLd， and LVVOLs significantly decreased （P<0.01）. The levels of NO and VEGF significantly increased （P<0.01）， while the levels of ET-1 and vWF significantly decreased （P<0.01）. Under electron microscopy， the microvascular basement membrane was relatively complete and the tight junctions were more continuous. The expression levels of ATP5D， F-actin， occludin， claudin， ZO-1， and VE-Cadherin significantly increased （P<0.05， P<0.01）， and the relative density of microvessels significantly increased （P<0.01）. ConclusionShengxiantang can effectively improve the cardiac function of CHF rats， reduce microvascular endothelial injury， strengthen the connection between endothelial cells， and increase microvessel density， thereby protecting myocardial microvascular injury.

Objective To investigate the relationship between inflammation index and the severity of cere-bral small vessel disease.Methods A total of 168 patients with cerebral small vessel disease who were admit-ted to the Eighth People's Hospital of Hebei from August 2019 to October 2022 were selected as the study ob-jects.The study subjects were divided into cerebral small vessel disease with light burden(light burden group)and cerebral small vessel disease with medium-heavy burden(medium-heavy burden group)according to the total imaging burden score of cerebral small vessel disease.The basic data and systemic immune-inflam-matory index(SII),neutrophil to lymphocyte ratio(NLR),platelet to lymphocyte ratio(PLR),and monocyte to lymphocyte ratio(MLR)were compared between the two groups.Spearman correlation analysis was used to evaluate the correlation between SII,NLR,PLR and MLR and the total imaging burden score of cerebral small vessel disease,and the influence of SII,NLR,PLR and MLR on the medium-heavy burden of cerebral small vessel disease was further analyzed by multivariate Logistic regression.Receiver operating characteristic(ROC)curves were plotted to analyze the predictive value of SII,NLR,PLR and MLR in the severity of cere-bral small vessel disease.Results The age,smoking history,hypertension history,neutrophil,platelet,SII,NLR,PLR and MLR in medium-heavy burden group were significantly higher than those in light burden group,and lymphocyte was significantly lower than that in light burden group,with statistical significance(P<0.05).Spearman correlation analysis showed that SII(r=0.377),NLR(r=0.516),PLR(r=0.486)and MLR(r=0.391)were positively correlated with the total imaging burden score of cerebral small vessel disease(P<0.001).Multivariate Logistic regression analysis showed that age,neutrophil,platelet,SII,NLR,PLR and MLR were independent risk factors for medium-heavy burden in cerebral small vessel disease,and lymphocyte was independent protective factor for medium-heavy burden in cerebral small vessel disease(P<0.05).ROC curve analysis results showed that the area under the curve of SII,NLR,PLR and MLR separately detected were 0.720(95%CI:0.646-0.787),0.802(95%CI:0.733-0.859),0.784(95%CI:0.714-0.843)and 0.728(95%CI:0.654-0.794),respectively.The area under the curve of the combined detection of the four indexes was higher than that of the single detection of each index(P<0.05).Conclusion The combined detection of SII,NLR,PLR and MLR has high predictive value for the severity of cerebral small vessel dis-ease,and is worthy of clinical promotion.

To address communication interference in complex noise environments inside and outside helmets,this study aims to improve the acoustic communication quality of in-helmet systems.A four-element microphone array communication hardware system was designed and implemented for use within the confined space of a helmet.Based on simulations of the internal acoustic field,the system incorporates a set of signal processing techniques,including array beamforming,echo cancellation,stationary noise speech enhancement,non-stationary noise suppression,and automatic gain control,forming a complete voice signal processing framework.Experimental results show that the proposed in-helmet microphone array noise reduction system achieves favorable downlink voice clarity under a total noise level of 85 dB(A),preliminarily validating the effectiveness and applicability of the implemented algorithms.This research provides essential technical and theoretical support for the future design and development of open-form in-helmet communication systems.

In order to validate the effects of restraint layer material on mechanical properties of spacesuit joints,application and development trend of typical restraint layer materials were studied.Based on the design requirement of restraint layer material for spacesuit joint functional analysis,choosing polyamide fiber and polyarylester fiber with same weaving process,two kinds of restraint layer fabrics were obtained.Effects on spacesuit joint performance were studied by comparison test on material mechanical properties and typical joint mobility with both fabrics.The results indicate that the characteristic of polyarylester with high strength and low elongation has advantage on compression and ergonomic support.The high modulus of polyarylester can provide creep resistance for spacesuit joints in the condition of periodic inflating and working,which can perform structure stability in life cycle.The high stiffness of polyarylester can reduce the thickness of fabric,which can improve hysteresis and reduce joint resistance on spacesuit joints but also interfere smoothness in the process of joint motion.The results can provide references for the design on spacesuit joints and the selection on restraint layer materials.

ObjectiveTo investigate the serotype distribution and antimicrobial resistance characteristics of foodborne Salmonella in infectious diarrhea cases in Minhang District, Shanghai, and to provide evidence for clinical diagnosis, treatment, prevention, and control of salmonellosis. MethodsFecal or anal swab samples were collected from foodborne diarrhea cases at sentinel hospitals between 2019 and 2023 in Minhang District of Shanghai. Salmonella was isolated, biochemically identified, and serotyped. Antimicrobial susceptibility testing was performed via the microbroth dilution method. ResultsA total of 4 294 samples were collected, from which 224 Salmonella strains were isolated, with an isolation rate of 5.22%. There was no gender difference in the positive rate of Salmonella. The positive rate showed seasonal fluctuations (χ²=160.475, P<0.001), with a higher positive rate in summer and autumn than in spring and autumn. Among different occupational groups, the positive rate was the highest among retired people (7.30%) (χ²=20.023, P=0.001). Among different age groups, the positive rate was the highest among those aged 80 years and above (7.33%) (χ²=13.491, P=0.009). A total of 28 serotypes were identified, with Salmonella Enteritidis being the most predominant, followed by Salmonella Typhimurium. Among them, 154 strains were multi-drug resistant to three or more types of antibiotics (68.75%). The most common drug resistance patterns among multi-drug resistant strains were ampicillin (AMP)-ampicillin/sulbactam (AMS)-sulfamethoxazole/trimethoprim (SXT)-chloramphenicol (CHL)-tetracycline (TET)-streptomycin (STR), AMP-TET-STR and AMP-AMS-TET-STR, with 9 strains being detected in each isolates. ConclusionThe positive rate of foodborne Salmonella in Minhang District, Shanghai, is high in summer and autumn, with a higher infection rate among retired people and those aged 60 years and above being the high-risk group. It is recommended to strengthen the protection for high-risk groups, implement targeted prevention and control measures in summer and autumn to reduce the risk of infection, and pay attention to guiding clinical medication and infection control.

AIM:Given the uncertain impact of osmotic pressure on embryoid body(EB)differentiation,this study aimed to investigate the effects of increased osmotic pressure on EB differentiation and explore the potential relation-ship between this process and cadherin.METHODS:Polhethylene glycol 300(PEG 300)was used to increase the os-motic pressure of the culture medium used for cultivating EBs under both high osmotic pressure and standard culture condi-tions.The experimental design included a control group,an experimental group(hypertonic group),groups treated with varying concentrations of PEG 300,and an experimental group treated with an inhibitor.Western blot,RT-qPCR,AM/PI staining,CCK-8,and immunocytochemical staining was used to analyze the cell viability and the expression of CDH1 and CDH2 markers of the three germ layers,and pluripotency markers within the EBs.RESULTS:Hypertonicity did not af-fect cell viability.Significant differences were observed in the expression of the cadherin proteins CDH1 and CDH2 in EBs between the experimental and control groups;however,no cleartrend towards an EMT shift was observed.Specifically,CDH2 expression was significantly down-regulated in experimental group,showing a clear correlation with variations in os-motic pressure.Moreover,compared with control group,pluripotency markers in the EBs from experimental group exhibited significantly higher expression levels from the 2nd day to the 5th day.A substantial increase in the expression of mesoder-mal markers was also observed;however,a downward trend was observed for ectodermal markers in experimental group.Intervention using SB431542,which up-regulates CDH2 expression by affecting TGF-β signaling,reversed the expression trend of mesodermal and ectodermal markers in experimental group.CONCLUSION:Elevated osmotic pressure appears to enhance the mesodermal differentiation efficiency in EBs,possibly correlating with CDH1 and CDH2 changes induced by osmotic pressure.Therefore,this study emphasizes the significant role of osmotic pressure in stem cell applications.

Objective:To analyze the clinical characteristics and neurophysiological features of patients with neuralgic amyotrophy (NA) and explore their neurological function status.Methods:Clinical data and neurophysiological findings of 90 patients diagnosed with NA at Beijing Tsinghua Changgung Hospital from September 2016 to January 2024 were collected and their clinical phenotypes and neurophysiological characteristics were systematically summarized and analyzed.Results:Among the 90 patients, males accounted for 60.0% (54 cases) and females accounted for 40.0% (36 cases). The duration of the disease was 12 (3, 36) months (ranged from 1 week to 5 years). The onset age of the patients was 58 (30, 70) (21-87) years. Unilateral involvement was noted in 94.4% (85/90) of patients, exhibiting a left-to-right ratio of 1∶1.3, while only 5.6% (5/90) had bilateral involvement. The majority of patients demonstrated a monophasic clinical course with a recurrence rate of just 2.2% (2/90). The primary clinical manifestations included upper limb pain in 70.0% (63/90) of patients, which progressed to muscle weakness and atrophy within 1 day to 1 month, whereas 30.0% (27/90) of patients without significant pain symptoms. Lesions predominantly affected the upper trunk of the brachial plexus, which accounted for 64.4% (58/90) of patients. Distal nerve injuries in the upper limb were observed in 14.4% (13/90) of patients, with 6.7% (6/90) demonstrating isolated anterior interosseous nerve involvement and another 6.7% (6/90) exhibiting isolated posterior interosseous nerve involvement; 1 case had concurrent anterior and posterior interosseous nerve damage. Additionally, 1 case presented with bilateral phrenic nerve involvement, and another patient had isolated posterior tibial nerve injury. Electrophysiological evaluations of patients with NA revealed that axonal damage to motor nerve fibers was a hallmark feature of the condition. Among patients undergoing motor nerve conduction studies, 68.8% (55/80) exhibited decreased compound muscle action potential amplitude, and 31.3% (25/80) had prolonged latency. Sensory nerve conduction was normal in 60.0% (48/80) of patients, while abnormalities included prolonged latency in 15.0% (12/80), reduced amplitude in 12.5% (10/80), slowed conduction velocity in 8.8% (7/80), and absent waveforms in 3.8% (3/80) of patients. The rates of abnormal nerve conduction findings in motor nerves were the highest in the suprascapular nerve (70.6%, 36/51), followed by the axillary nerve (58.3%, 35/60), musculocutaneous nerve (50.7%, 35/69), long thoracic nerve (6/17), and both anterior and posterior interosseous nerves (7.5%, 6/80 each). In sensory nerves, abnormalities were predominantly noted in the lateral antebrachial cutaneous nerve (30.0%, 12/40). Needle electromyography demonstrated neurogenic damage, most frequently affecting the infraspinatus muscle (69.2%, 18/26), biceps brachii (68.1%, 49/72), and deltoid muscle (65.3%, 47/72). The positive rate of magnetic resonance neurography (MRN) for NA was 62.1% (41/66), among which 63.4% (26/41) showed localized swelling of the brachial plexus, 51.2% (21/41) exhibited T 2 hyperintensity, and 4.9% (2/41) demonstrated denervated changes in the muscles. The positive rate of ultrasound for NA was 71.1% (59/83), with 91.5% (54/59) showing nerve swelling and 8.5% (5/59) exhibiting hourglass constriction .Conclusions:NA is a peripheral neuropathy characterized by spontaneous pain, limb weakness, and (or) muscle atrophy primarily. Its clinical phenotype predominantly involves damage to the upper trunk of the brachial plexus, which can also manifest as isolated mononeuropathy. Neurophysiological findings most commonly reveal the neurogenic damage to the muscles innervated by the upper trunk of the brachial plexus, mainly characterized by the axonal damage to the motor nerves, and pure motor nerve damage may also be observed. MRN and neuroultrasound can assist in qualitative diagnosis.

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Objective: To understand physical activity status of children and adolescents in Tujia inhabited areas, and to provide reference for the intervention model of physical activity of children and adolescents in minority areas. Methods: A cluster sample of 2 466 Tujia pupils from two primary schools in Lichuan City, Enshi Tujia and Miao Autonomous Prefecture of Hubei Province was selected to investigate physical activity status of Tujia pupils. The univariate χ 2 test was used to analyze the physical activity status of Tujia children and adolescents and its influencing factors. Results: The median duration of high intensity activity was 49.9 minutes/day in the last week, and 47.93% of participants met the physical activity standard( χ 2=80.47, P <0.01), the median duration of sitting was 396.1 minutes/day in the last week, and the qualified rate of screen time was 78.99%, and the differences of qualified rate between daystudents and residential students were of statistical differences( χ 2=35.12, P <0.01)). Conclusion The children and adolescents in the Tujia community are lack of physical activity. Therefore, it is necessary to take effective intervention measures to pay attention to the children and adolescents physical activity.