Age-related secretion of grancalcin by macrophages induces skeletal stem/progenitor cell senescence during fracture healing

Skeletal stem/progenitor cell(SSPC)senescence is a major cause of decreased bone regenerative potential with aging,but the causes of SSPC senescence remain unclear.In this study,we revealed that macrophages in calluses secrete prosenescent factors,including grancalcin(GCA),during aging,which triggers SSPC senescence and impairs fracture healing.Local injection of human rGCA in young mice induced SSPC senescence and delayed fracture repair.Genetic deletion of Gca in monocytes/macrophages was sufficient to rejuvenate fracture repair in aged mice and alleviate SSPC senescence.Mechanistically,GCA binds to the plexin-B2 receptor and activates Arg2-mediated mitochondrial dysfunction,resulting in cellular senescence.Depletion of Plxnb2 in SSPCs impaired fracture healing.Administration of GCA-neutralizing antibody enhanced fracture healing in aged mice.Thus,our study revealed that senescent macrophages within calluses secrete GCA to trigger SSPC secondary senescence,and GCA neutralization represents a promising therapy for nonunion or delayed union in elderly individuals.

由苯甲醇合成苯甲酸乙酯综合制备实验的课程思政设计

将苯甲酸合成与苯甲酸乙酯制备两个经典实验改造为综合实验,并以改进合成过程实现绿色、高效转化为案例,引导学生通过查阅文献,综合分析合成过程,指出原合成方法存在的问题和不足,提出改进的建议,在此过程中,引导学生将法律法规、实验规范、学科伦理、绿色理念、环保和可持续发展理念等融入实验的设计和实施全过程,使学生在受到基本操作训练的同时得到素质的全面提升。

铁死亡抑制因子KIF20A对食管癌细胞生物学行为及铁死亡的影响

目的探讨驱动蛋白家族成员20A(KIF20A)在食管鳞状细胞癌(esophageal squamous cell carcinoma,ESCC)中的表达及对Eca109细胞生物学行为和铁死亡的影响。方法通过生物信息学分析预测KIF20A在ESCC中的表达。构建KIF20A敲低/过表达Eca109细胞系,实验分组:对照组,KIF20A敲低组,KIF20A过表达组。通过CCK-8法,Transwell侵袭实验,细胞划痕实验检测KIF20A对Eca109细胞增殖,迁移能力的影响。采用RAS选择性致死化合物3(RSL3)诱导建立铁死亡应激模型,检测谷胱甘肽(glutathione,GSH),丙二醛(malondialdehyde,MDA)含量。结果和对照组比较,KIF20A敲低组细胞增殖活力降低(P<0.05),KIF20A过表达组细胞增殖活力增加(P<0.05)。与对照组比较,KIF20A敲低组细胞侵袭及迁移能力降低(P<0.05),KIF20过表达组细胞侵袭及迁移能力增加(P<0.05)。RSL3诱导处理后,KIF20A敲低组细胞裂解液中GSH含量低于对照组(P<0.05),MDA含量高于对照组(P<0.05);KIF20A过表达组细胞结果与之相反。结论KIF20A在ESCC中高表达,其在Eca109细胞中发挥着促进增殖、侵袭、迁移及抑制铁死亡的作用。

Effect of drying methods on perovskite films and solar cells

The high efficiency,solution processibility,and flexibility of perovskite solar cells make them promising candidates for the photovoltaic industry[1−8].The deposition method is one of the most critical factors that affect the performance of perovskite films.Various deposition methods have been developed to make perovskite films,including spin-coating,slotdie coating.

Research Progress on the Application of Cluster Nursing Mode in ECMO-Assisted Patients

Cluster care,also known as cluster therapy,cluster intervention,or bundled therapy,is a series of evidence-based supportive joint care measures developed to improve the quality of care for specific patients or nursing issues.It is highly reliable and can effectively improve patient prognosis.This article summarized the application of cluster nursing care in extracorporeal membrane oxygenation(ECMO)-assisted patients and the problems faced to provide a reference for evidence-based decision-making in clinical practice.

Blood exosomal micro ribonucleic acid profiling reveals the complexity of hepatocellular carcinoma and identifies potential biomarkers for differential diagnosis

BACKGROUND Hepatocellular carcinoma(HCC)is one of the leading causes of cancer-related deaths worldwide,but there is a shortage of effective biomarkers for its diagnosis.AIM To explore blood exosomal micro ribonucleic acids(miRNAs)as potential biomarkers for HCC diagnosis.RESULTS The principal component analysis suggested that daily alcohol consumption could alter the blood exosomal miRNA profiles of hepatitis B virus positive non-HCC patients through miR-3168 and miR-223-3p.The miRNA profiles also revealed the tumor stages of HCC patients.High expression of miR-455-5p and miR-30c-5p,which significantly correlated with better overall survival in tumor tissues,could also be detected in blood exosomes.Two pairs of miRNAs(miR-584-5p/miR-106-3p and miR-628-3p/miR-941)showed a 94.1%sensitivity and 68.4%specificity to differentiate HCC patients from non-HCC patients.The specificity of the combination was substantially influenced by alcohol consumption habits.CONCLUSION This study suggested that blood exosomal miRNAs can be used as new noninvasive diagnostic tools for HCC.However,their accuracy could be affected by tumor stage and alcohol consumption habits.

Finite-State Markov Wireless Channel Modeling for Railway Tunnel Environments

In recent years,high-speed railways(HSRs)have developed rapidly with a high transportation capacity and high comfort level.A tunnel is a complex high-speed rail terrain environment.It is very important to establish an accurate channel propagation model for a railway tunnel environment to improve the safety of HSR operation.In this paper,a method for finite-state Markov chain(FSMC)channel modeling with least squares fitting based on non-uniform interval division is proposed.First,a path loss model is obtained according to measured data.The communication distance between the transmitter and receiver in the tunnel is non-uniformly divided into several large non-overlapping intervals based on the path loss model.Then,the Lloyd-Max quantization method is used to determine the threshold of the signal-to-noise ratio(SNR)and the channel state quantization value and obtain the FSMC state transition probability matrix.Simulation experiments show that the proposed wireless channel model has a low mean square error(MSE)and can accurately predict the received signal power in a railway tunnel environment.

China requires region-specific manure treatment and recycling technologies

Heterogenous distribution of crops,feed and livestock across China has halted the circulation of nutrients within the agricultural system and is responsible for massive nutrient losses[1,2].Generated livestock manure exceeded optimal crop requirements in 30%and 50%of over 2300 studied counties when there was improved recycling of nitrogen(N)and phosphorus(P)in the food chain,repectively[2].Most of these counties are located in southern and coastal areas,whereas there is a deficit of livestock manure in northern and western China.Such heterogenous distribution of crop-livestock production led to 4.0 Tg manure N and 0.9 Tg manure P[2],which are economically impossible to recycle and will end up in the surrounding environment.In addition,about 40%of feed protein consumed by domestic livestock production relied on importation,putting China’s livestock production supply at high risk in the post pandemic world[3].Hence,China is facing the twin issues of too many manure nutrients but too little feed nutrients simultaneously.

Debye-screening effect on electron-impact excitation of helium-like Al^(11+)and Fe^(24+)ions

Debye-screening effects on the electron-impact excitation(EIE)processes for the dipole-allowed transition 1 s_(2)^(1)S→1 s2 p^(1)P in He-like Al^(11+)and Fe^(24+)ions are investigated using the fully relativistic distorted-wave methods with the Debye-Huckel(DH)model potential.Debye-screening effects on the continuum-bound(CB)interaction and target ion are discussed,both of which result in reduction of EIE cross sections.This reduction due to screening on the CB interaction is dominant.The non-spherical and spherical DH potentials are adopted for considering the screening effect on the CB interaction.It is found that the spherical DH potential could significantly overestimate the influence of plasma screening on EIE cross sections for multielectron He-like ions.

Electron excitation processes in low energy collisions of hydrogen-helium atoms

The electron excitation processes of H(1s)+He(1s^(2))→H(2s/2p)+He(1s^(2))are studied in impact energy range of 20-2000 e V/u by using the quantum-mechanical molecular orbital close-coupling(QMOCC)method.Total and state-selective cross sections have been obtained and compared with the available theoretical and experimental results.The results agree well with available measurements in the overlapping energy regions overall.The comparison of our results with other theoretical calculations further demonstrates the importance of considering a sufficient number of channels.The datasets presented in this paper,including the excitation cross sections,are openly available at https://www.doi.org/10.57760/sciencedb.j00113.00083.

4‑Terminal Inorganic Perovskite/Organic Tandem Solar Cells Offer 22%Efficiency

After fast developing of single-junction perovskite solar cells and organic solar cells in the past 10 years,it is becoming harder and harder to improve their power conversion efficiencies.Tandem solar cells are receiving more and more attention because they have much higher theoretical efficiency than single-junction solar cells.Good device performance has been achieved for perovskite/silicon and perovskite/perovskite tandem solar cells,including 2-terminal and 4-terminal structures.However,very few studies have been done about 4-terminal inorganic perovskite/organic tandem solar cells.In this work,semi-transparent inorganic perovskite solar cells and organic solar cells are used to fabricate 4-terminal inorganic perovskite/organic tandem solar cells,achieving a power conversion efficiency of 21.25%for the tandem cells with spin-coated perovskite layer.By using drop-coating instead of spin-coating to make the inorganic perovskite films,4-terminal tandem cells with an efficiency of 22.34%are made.The efficiency is higher than the reported 2-terminal and 4-terminal inorganic perovskite/organic tandem solar cells.In addition,equivalent 2-terminal tandem solar cells were fabricated by connecting the sub-cells in series.The stability of organic solar cells under continuous illumination is improved by using semi-transparent perovskite solar cells as filter.

Nano silica aerogel-induced formation of an organic/alloy biphasic interfacial layer enables construction of stable high-energy lithium metal batteries

Lithium metal batteries represent promising candidates for high-energy-density batteries, however, many challenges must still be overcome,e.g., interface instability and dendrite growth. In this work, nano silica aerogel was employed to generate a hybrid film with high lithium ion conductivity(0.6 mS cm^(-1)at room temperature) via an in situ crosslinking reaction. TOF-SIMS profile analysis has revealed conversion mechanism of hybrid film to Li–Si alloy/Li F biphasic interface layer, suggesting that the Li–Si alloy and Li F-rich interface layer promoted rapid Li+transport and shielded the Li anodes from corrosive reactions with electrolyte-derived products. When coupled with nickel-cobalt-manganese-based cathodes, the batteries achieve outstanding capacity retention over 1000 cycles at 1 C. Additionally the developed film coated on Li enabled high coulombic efficiency(99.5%) after long-term cycling when coupled with S cathodes. Overall, the results presented herein confirm an effective strategy for the development of high-energy batteries.

基于数据挖掘的《医案类聚》痿证用药规律分析

目的 分析挖掘《医案类聚》中治疗痿证医案中的用药规律,为痿证的临床治疗提供参考。方法 搜集整理《医案类聚》中古代医家的医案,根据纳入排除标准提取处方药物,进行规范化处理,应用古今医案云平台软件(V2.3.5)对处方数据进行频次统计、聚类分析、关联分析、复杂网络等分析,得到古代医家治疗痿证的用药规律。结果 经过筛选,共涉及医家38人,纳入医案157案,共166诊次,总用药频次1 596次。常用中药味多甘苦,主要归于肾、肝经,高频药物为当归、牛膝、茯苓,常用药对有当归-牛膝、虎胫骨-牛膝等,核心方药组成以虎潜丸为基础加减。结论 《医案类聚》中各医家治疗痿证的常用药物以补肝肾、强筋骨为主,清利湿热、调畅气机为辅,治疗以补益为主,以肝肾为本,辅以清热坚阴。

Enhanced E-commerce Fraud Prediction Based on a Convolutional Neural Network Model

The rapidly escalating sophistication of e-commerce fraud in recent years has led to an increasing reliance on fraud detection methods based on machine learning.However,fraud detection methods based on conventional machine learning approaches suffer from several problems,including an excessively high number of network parameters,which decreases the efficiency and increases the difficulty of training the network,while simultaneously leading to network overfitting.In addition,the sparsity of positive fraud incidents relative to the overwhelming proportion of negative incidents leads to detection failures in trained networks.The present work addresses these issues by proposing a convolutional neural network(CNN)framework for detecting ecommerce fraud,where network training is conducted using historical market transaction data.The number of network parameters reduces via the local perception field and weight sharing inherent in the CNN framework.In addition,this deep learning framework enables the use of an algorithmiclevel approach to address dataset imbalance by focusing the CNN model on minority data classes.The proposed CNN model is trained and tested using a large public e-commerce service dataset from 2018,and the test results demonstrate that the model provides higher fraud prediction accuracy than existing state-of-the-art methods.

RAISE:A Resilient Anonymous Information Sharing Environment

With the widespread application of cloud computing and network virtualization technologies,more and more enterprise applications are directly deployed in the cloud.However,the traditional TCP/IP network transmission model does not fully consider the information security issues caused by the uncontrollable internet environment.Network security communication solutions represented by encrypted virtual private networks(VPN)are facing multiple security threats.In fact,during the communication process,the user application needs to protect not only the content of the communication but also the behavior of the communication,such as the communication relationship,the communication protocol,and so on.Inspired by blockchain and software-defined networking technology,this paper proposes a resilient anonymous information sharing environment,RAISE.The RAISE system consists of user agents,a core switching network and a control cluster based on a consortium blockchain.User agents are responsible for segmenting,encrypting,and encapsulating user traffic.The core switching network forwards user traffic according to the rules issued by the controller,and the controller dynamically calculates the forwarding rules according to the security policy.Different from onion routing technology,RAISE adopts the controller to replace the onion routing model,which effectively overcomes the uncontrollability of nodes.The dispersed computing model is introduced to replace the TCP/IP pipeline transmission models,which overcomes the problems of anti-tracking and traffic hijacking that cannot be solved by VPNs.We propose a blockchain control plane framework,design the desired consensus algorithmand deploy a RAISE systemconsisting of 150 nodes in an internet environment.The experimental results show that the use of blockchain technology can effectively improve the reliability and security of the control plane.While maintaining high-performance network transmission,it further provides network communication security.

Pharmacodynamics of frigid zone plant Taxus cuspidata S.et Z.against skin melanin deposition,oxidation,inflammation and allergy

Background:Taxus cuspidata S.et Z.is a precious species of frigid zone plant belonging to the Taxaceae family,which possesses anticancer,anti-inflammatory,hypoglycemic,and antibacterial pharmacological properties.While taxane extracted from Taxus chinensis has been reported to elicit antioxidant activities,whether Taxus cuspidata S.et Z.has skin-protective actions against injuries remained unknown.This study aims to explore the pharmacological effects of three Taxus extracts on skin melanin deposition,oxidation,inflammation,and allergy so as to provide new ideas for the prevention and treatment of various diseases related to skin damage.Methods:Skin melanin deposition was evaluated by measuring melanin content in the skin of guinea pigs by alkali lysis method.Antioxidant capacity was evaluated by measuring superoxide dismutase(SOD)concentration and glutathione(GSH)content in skin tissue homogenates of Kunming mice by SOD assay kit and micro reduced GSH assay kit.The quantitative real-time polymerase chain reaction(qRT-PCR)and western blotting were used to examine the levels of both SOD and recombinant glutathione peroxidase 4(GPX4).Skin inflammation was evaluated by xylene-induced ear swelling test and egg-white-induced paw swelling test in mice.In a mouse model of skin allergy induced by 4-aminopyridine(4-AP),allergy was determined by licking body counts and histamine concentrations in tissue homogenates using enzyme-linked immunosorbent assay(ELISA)kits.Two proinflammatory factors tumor necrosis factor(TNF)-αand interleukin(IL)-1βwere measured by qRT-PCR.Hematoxylin and eosin(HE)staining was conducted to assess the degree of skin lesion.Results:All three Taxus extracts including Taxus chinensis essential oil,Taxus chinensis extract and Taxus chinensis extract compound reduced the melanin deposits in the back skin relative to the non-treated control animals,of which Taxus chinensis essential oil produced the greatest effect.In contrast,the three Taxus extracts elevated SOD and GSH levels in the skin tissues,and the highest increase was seen with Taxus chinensis essential oil.Three Taxus extracts,especially Taxus chinensis essential oil,effectively reduce the rate of ear and paw swelling.All three Taxus extracts reduced the number of body licks,the levels of TNF-αand IL-1β,and the histamine content in tissue homogenates of mice and alleviated skin damage.Consistently,Taxus chinensis essential oil yielded the greatest magnitude of decreases.Conclusion:While all three Taxus extracts possessed the anti-skin melanin deposition,oxidation,and allergy properties,Taxus chinensis essential oil produced the superior effects.

Study on Influence Factors of Pressure Injury Risk in the Elderly Inpatients with Kidney Disease Based on LASSO Regression

Objective: This paper aims to explore clinical status and related influence factors of pressure injury (PI) in the elderly inpatients with kidney disease, so as to provide reference for the prevention and treatment of PI in the elderly inpatients with kidney disease. Methods: Retrospective collection method is adopted to collect 158 clinical cases of the elderly inpatients with kidney disease aged ≥ 60 in the Nephrology Department, the First Affiliated Hospital of Jinan University from January 2017 to December 2019, and then least absolute shrinkage and selection Operator (LASSO) regression analysis is used to analyze 17 possible influence factors;finally Logistic regression model is established to analyze and screen influence factors of risk. Results: 1) Among 158 elderly inpatients with medium and high risk of PI, the incidence of PI is 20.25%;the most common stage of injury is stage I (42.5%);sacrococcygeal (60%) is the high-risk site of pressure injury. 2) LASSO regression analysis shows that history of present respiratory infection/respiratory failure (β = 1.2714. P < 0.05) and hospitalization time (β = 0.4177. P < 0.05) are independent factors influencing PI risk in the elderly inpatients with kidney disease. Conclusion: The elderly patients with kidney disease and PI risk are the high incidence population of hospital acquired PI;for the elderly inpatients with kidney disease and having respiratory infection history or respiratory failure, prolonged hospitalization will significantly increase the risk of PI. Therefore, targeted preventive and control measures should be taken to reduce the incidence of PI.

尼古丁增强肺癌细胞耐药性与Bcl-2家族蛋白的关系

肺癌是最常见的恶性肿瘤之一,长期吸烟是导致肺癌患者发生耐药及死亡的主要因素。尼古丁是香烟烟雾中的主要成分,其可以影响肺癌细胞中B细胞淋巴瘤/白血病2(Bcl-2)家族蛋白的表达,从而促进癌细胞的生长,增强耐药性。本文主要阐述近年来尼古丁增强肺癌细胞耐药性与Bcl-2家族蛋白关系的相关研究。

选择性肝动脉和门静脉阻断、二步肝切除治疗肝癌的安全性和疗效研究

目的探讨二步肝切除(先选择性肝动脉和门静脉阻断,再行肝癌切除)治疗肝癌的安全性和疗效。方法选取2014年12月-2018年4月浙江大学医学院附属杭州市第一人民医院收治的乙型肝炎并原发性肝癌患者7例,平均年龄44.1岁,术前甲胎蛋白(AFP)都高于正常值,平均肿瘤直径13.0 cm。第1步通过手术或介入的方法行选择性肝动脉和门静脉阻断,不进行肝脏实质的离断。术后1~2周内评估预留肝脏体积(FLR)的增生情况,如FLR的增生达到要求则行肝切除手术。2期分别进行右半肝切除、扩大右半肝切除及扩大左半肝切除。结果第1步手术或栓塞后无肝衰竭及死亡的发生。所有患者的FLR在第1步后有不同程度的增生。术前患者平均FLR占标准肝体积的百分比是32.1%,第1步后8~15 d增加到40.5%,满足第2步肝切除的需要。7例患者分别在第一步完成后8~18 d行第2步肝切除,第2步肝切除后无死亡发生。7例患者中有6例甲胎蛋白术后2个月降到正常范围。随访截止时间2018年11月20日,有4例患者仍然存活,并且其中3例是无瘤生存,最长的1例无瘤生存已达35.9个月。结论选择性肝动脉和门静脉阻断、不离断肝脏实质能够促进剩余肝脏体积的增生,在此基础上行巨大肝癌切除术疗效好,易于推广。

间歇性低压低氧对大鼠肺动脉高压的预防作用及血管保护机制

目的采用野百合碱(MCT)诱导雄性SD大鼠肺动脉高压(PAH)模型,观察间歇性低压低氧(IHH)对动物模型PAH的预防作用及其对肺血管的保护机制。方法大鼠随机分为正常对照组(CON组)、肺动脉高压组(PAH组)、间歇性低压低氧组(IHH组)和IHH+MCT组。CON组不进行任何处理,28 d后直接行右心室收缩压(RVSP)和肺动脉平均压(m PAP)的测定,计算右心室肥厚指数(RVHI)并行血管环灌流实验观察血管反应性改变。PAH组经腹腔注射MCT 14 d后进行实验。IHH组接受模拟5 km海拔高度,6 h/d的IHH处理28 d后实验。IHH+MCT组先经受28 d的IHH后,腹腔注射MCT 14 d后实验。结果PAH组大鼠从注射MCT后1周体重较CON组减轻,倦卧,喘促,活动量、进食量减少。IHH+MCT组大鼠一般情况较同期的PAH组有所改善,但较CON组差。实验过程中PAH组死亡2只,其余各组均全部存活。PAH组的m PAP、RVSP、RV、LV+S、RVHI与其他组比较,差异有统计学意义(P<0.05),PAH组高于其他组,IHH+MCT组的指标较PAH组显著降低。PAH组大鼠肺动脉的内皮依赖性血管收缩及舒张反应与CON组比较,差异有统计学意义(P<0.05),PAH组受损,而IHH干预后,可改善其受损的内皮依赖性的血管收缩及舒张反应。结论 IHH能够有效降低MCT诱导的PAH大鼠升高的m PAP、RVSP、RV、LV+S、RVHI,且对PAH大鼠肺血管的内皮依赖性血管收缩及舒张反应具有保护作用。