Construction of CDKN2A-related competitive endogenous RNA network and identification of GAS5 as a prognostic indicator for hepatocellular carcinoma

BACKGROUND Competitive endogenous RNA(ceRNA)is an innovative way of gene expression modulation,which plays a crucial part in neoplasia.However,the intricacy and behavioral characteristics of the ceRNA network in hepatocellular carcinoma(HCC)remain dismal.AIM To establish a cyclin dependent kinase inhibitor 2A(CDKN2A)-related ceRNA network and recognize potential prognostic indicators for HCC.METHODS The mutation landscape of CDKN2A in HCC was first explored using the cBioPortal database.Differential expression analysis was implemented between CDKN2Ahigh and CDKN2Alow expression HCC samples.The targeted microRNAs were predicted by lncBasev3.0,and the targeted mRNAs were predicted by miRDB,and Targetscan database.The univariate and multivariate analysis were utilized to identify independent prognostic indicators.RESULTS CDKN2A was frequently mutated and deleted in HCC.The single-cell RNA-sequencing analysis revealed that CDKN2A participated in cell cycle pathways.The CDKN2A-related ceRNA network-growth arrest specific 5(GAS5)/miR-25-3p/SRY-box transcription factor 11(SOX11)was successfully established.GAS5 was recognized as an independent prognostic biomarker,whose overexpression was correlated with a poor prognosis in HCC patients.The association between GAS5 expression and methylation,immune infilt-ration was explored.Besides,traditional Chinese medicine effective components targeting GAS5 were obtained.CONCLUSION This CDKN2A-related ceRNA network provides innovative insights into the molecular mechanism of HCC formation and progression.Moreover,GAS5 might be a significant prognostic biomarker and therapeutic target in HCC.

Kinetic and thermodynamic synergy of organic small molecular additives enables constructed stable zinc anode

An organic small molecule additive zinc formate is introduced to construct stable Zn metal interphase by electrochemical kinetic control and thermodynamic adjustment.It partially forms a water-formate concomitant dipole layer at the internal Helmholtz electrical double layers(HEDLs) under the preferential adsorption function of formate on Zn surface,reducing the occurrence of side reactions at phase interface.Meanwhile,free formate in HEDLs regulates the Zn^(2+) solvation sheath structure to accelerate the desolvation,transference,and deposition kinetics of Zn^(2+).Besides,the hydrolysis reaction of zinc formate increases the hydrogen evolution overpotential,inhibiting the thermodynamic tendency of hydrogen evolution.Consequently,it presents stable cycle for more than 2400 h at 5 mA cm^(-2),as well as an average Coulombic efficiency of 99.8% at 1 A g^(-1) after 800 cycles in the Zn‖VO_(2) full cell.The interphase engineering strategy zinc anode by organic small molecular brings new possibility towards high-performance aqueous zinc-ion batteries.

Revealing sodium storage mechanism of hard carbon anodes through in-situ investigation of mechano-electrochemical coupling behavior

Hard carbon(HC)is considered a promising anode material for sodium-ion batteries due to its relatively low price and high specific capacity.However,HC still suffers from unclear reaction mechanisms and unsatisfactory cycling stability.The study of mechano-electrochemical coupling behavior by in-situ measurement techniques is expected to understand the sodium storage and degradation mechanisms.In this paper,the strain and stress evolution of HC anodes at different sodiation/desodiation depths and cycles are investigated by combining electrochemical methods,digital image correlation,and theoretical equations.The observation by monitoring the in-situ strain evolution during the redox process supports the“adsorption-intercalation/filling”mechanism in reduction and the“de-filling/de-intercalation-deso rption”mechanism in oxidation.Further studies have demonstrated that the strain and stress of the electrode show periodic changes accompanied by a continuous accumulation of residual stress during cycles,explaining the capacity degradation mechanism of HC from a mechanical perspective.In addition,when the higher current density is applied,the electrodes experience greater strain and stress associated with the Na+insertion rate.This work clarifies the Na-storage mechanism and the mechano-electrochemical coupling mechanism of HC anodes by in-situ strain measurement,which helps optimize and design the anode materials of sodium-ion batteries from the perspective of interface microstructure and multi-field coupling,such as in situ integrated interface structure design.

预应力束断后黏结性能退化试验与模拟研究

针对氯盐环境下后张预应力混凝土(PC)梁端锚区预应力束锈蚀断裂问题,该文采用电化学加速锈蚀试验得到3个端锚区预应力束断裂后的PC构件,开展静力拉拔试验,研究混凝土强度和箍筋直径对断后预应力束黏结性能的影响。结果表明:钢绞线黏结破坏始于拉拔端,并向自由端逐渐发展;提高混凝土强度等级和箍筋直径可提高预应力束与混凝土界面间的黏结性能。采用Abaqus软件对断后预应力束黏结性能进行数值模拟,结果表明:黏结‒滑移的数值模拟结果和试验值变化规律一致,吻合度较高;混凝土和预应力束的应力云图表明:混凝土和预应力束的应力沿试件拉拔端向自由端折减,应力传递过程中伴随着应力损失。

Numerical simulation of hydrothermal mineralization associated with simplified chemical reactions in Kaerqueka polymetallic deposit, Qinghai, China

The Kaerqueka polymetallic deposit, Qinghai, China, is one of the typical skarn-type polymetallic ore deposits in the Qimantage metallogenic belt. The dynamic mechanism on the formation of the Kaerqueka polymetallic deposit is always an interesting topic of research. We used the finite difference method to model the mineralizing process of the chalcopyrite in this region with considering the field geological features, mineralogy and geochemistry. In particular, the modern mineralization theory was used to quantitatively estimate the related chemical reactions associated with the chalcopyrite formation in the Kaerqueka polymetallic deposit. The numerical results indicate that the hydrothermal fluid flow is a key controlling factor of mineralization in this area and the temperature gradient is the driving force of pore-fluid flow. The metallogenic temperature of chalcopyrite in the Kaerqueka polymetallic deposit is between 250 and 350 ℃. The corresponding computational results have been verified by the field observations. It has been further demonstrated that the simulation results of coupled models in the field of emerging computational geosciences can enhance our understanding of the ore-forming processes in this area.

Dynamic channel reservation scheme based on priorities in LEO satellite systems

According to low earth orbit（LEO） satellite systems with users of different levels, a dynamic channel reservation scheme based on priorities is proposed. Dynamic calculation of the thresholds for reserved channels is the key of this strategy. In order to obtain the optimal thresholds, the traffic is predicted based on the high-speed deterministic movement property of LEO satellites firstly. Then, a channel allocation model based on Markov is established. Finally, the solution of the model is obtained based on the genetic algorithm. Without user location, this strategy effectively reduces handover failures and improves channel utilization by adjusting dynamically the thresholds according to traffic conditions. The simulation results show that the system＇s overall quality of service can be improved by this strategy.

Viscoelastic Analysis of a Surface Acoustic Wave Gas Sensor Coated by a New Deposition Technique

An analysis of the response of surface acoustic wave sensors coated with polymer film based on new coating deposition （self-assemble and molecularly imprinted technology） is described and the response formulas are hence deduced. Using the real part of shear modulus, the polymer can be classified into three types： glassy film, glassy-rubbery film and rubbery film, Experimental results show that the attenuation response is in better consistence with the simulation than in Martin＇s theory, but the velocity response does not accord with the calculation exactly. Maybe it is influenced by the experimental methods and environment. In addition, simulations of gas sorption for polymer films are performed. As for glassy film, the SAW sensor response increases with increasing fihn thickness, and the relationship between the sensor response and the concentration of gas is pretty linear, while as for glassy-rubbery flint and rubbery film, the relationship between the sensor sensitivity anti concentration of gas is very complicated. The ultimately calculated results indicate that the relationship between the sensor response and frequency is not always linear due to the viscoelastic prooerties of the polymer.

Treatment strategies and preventive methods for drug-resistant Helicobacter pylori infection

The infection and drug resistance rates of Helicobacter pylori(H.pylori)are high and must be prevented and treated by better strategies.Based on recent research advances in this field as well as the results from our team and those on traditional Chinese medicine,we review the causes of drug resistance,and prevention and treatment strategies for drug-resistant H.pylori infection,with an aim to make suggestions for the development of new drugs,such as establishment of new target identification and screening systems,modification of existing drug structures,use of new technologies,application of natural products,and using a commercial compound library.This article may provide reference for eradication of drug-resistant H.pylori.

Study on the Surface Acoustic Wave Sensor with Self-Assembly Imprinted Film of Calixarene Derivatives to Detect Organophosphorus Compounds

The molecularly imprinted technology and the self-assembly technique were used together on the calixarene surface acoustic wave (SAW) chemical sensors to detect organophosphorus compounds. 25-(thioalkyl-alkoxy)-p-tertbutylcalix[4] arene with self-assembled monolayer character was the sensitive coating of the sensors. The sensors had a special response to organophosphorus compounds and the response frequency shift of this sensor to organophosphorus compounds in 0.1 mg/m3 was 350 Hz. The response frequency increased linearly with the increase of the concentration of DMMP in the range from 0.1 to 0.6 mg/m3. The possible explanation of the interaction between the coatings and organophosphorus compounds was discussed.

Comparison of the pain and inflammatory stress after percutaneous transforaminal endoscope discectomy and open fenestration discectomy

Objective:To study the differences in pain and inflammatory stress after percutaneous transforaminal endoscope discectomy and open fenestration discectomy.Methods: Patients with lumbar intervertebral disc herniation who underwent surgical treatment in our hospital between January 2013 and January 2017 were selected and randomly divided into two groups: Percutaneous transforaminal endoscope discectomy (PTED) group and control group. Patients in PTED group received percutaneous transforaminal endoscope discectomy, while control group received open fenestration discectomy. Serum levels of pain substances SP, NPY, PGE2 and NGF, inflammatory mediators IFN-γ, TNF-α, IL-17 and MMP3 as well as stress response substances Cor, NE, OH-, O2- and MDA of two groups of patients were determined the same day after surgery and 3 days after surgery.Results: The same day after surgery and 3 d after surgery, serum SP, NPY, PGE2, NGF, IFN-γ, TNF-α, IL-17, MMP3, Cor, NE, OH-, O2- and MDA levels of PTED group were significantly lower than those of control group. Conclusion: Percutaneous transforaminal endoscope discectomy for lumbar intervertebral disc herniation causes less postoperative pain and inflammatory stress than open fenestration discectomy.

Thermal hazard and mechanism study of 5-(4-Pyridyl)tetrazolate(H4-PTZ)

Thermal decomposition experiment of 5-(4-Pyridyl)tetrazolate(H4-PTZ)was carried out.The heat flow curve and reaction rate data under different heating rates were obtained.The characteristic parameters were obtained.The apparent activation energy for each individual reaction was calculated by applying different methods.On this basis,the Malek method was used to predict the most probable mechanism function of thermal decomposition reaction of H4-PTZ.The thermal safety parameters,including self-accelerating decomposition temperature,hot spot fire temperature and thermal explosion critical temperature were also predicted.The activation enthalpy,activation entropy,and activation Gibbs free energy of H4-PTZ are calculated.Gaussian16 program was used to optimize the molecular structure,search the transition state and calculate the intrinsic reaction coordinates of H4-PTZ.The most probable decomposition path of H4-PTZ was found,and the activation energy calculated by experiment was compared with that calculated by the theory.

日间疝修补术后不同加压方式对血清肿预防的差异研究

目的探究日间腹股沟疝无张力修补术后使用新型疝穿戴装置(HWD)和传统压迫方法对术后血清肿预防效果及生活质量影响的差异,以期发现可有效降低术后血清肿发生率及提高患者生活质量的临床途径。方法选取四川省人民医院日间手术中心2022年12月至2023年8月收治的125例腹股沟疝患者,均行腹腔镜下腹股沟疝无张力修补术,采用随机数字表法将纳入样本的腹股沟疝患者随机分成试验组与对照组。试验组术后穿戴HWD压迫术区体表投影处,对照组术后用盐袋常规压迫。随访并分析2组术后血清肿发生情况、疼痛视觉模拟量表(VAS)评分,使用卡罗莱纳舒适量表(CCS)评估生活质量,并调查HWD的使用满意度。结果2组患者在年龄、性别、疝类型等一般术前资料方面差异无统计学意义(P>0.05)。共有122例完成术后1周随访,随访率97.6%。其中试验组血清肿发生率为8.3%(5/60),对照组血清肿发生率为21.0%(13/62),差异有统计学意义(P<0.05)。术后1、3个月2组血清肿发生率差异无统计学意义(P>0.05)。随着术后时间延长,2组患者VAS评分均逐渐降低,其中试验组在术后2 h VAS评分低于对照组(P<0.05),术后1周VAS评分差异无统计学意义(P>0.05)。术后1周,2组患者的CCS评分均处于较低水平,且试验组低于对照组(P<0.05)。术后1周评估,HWD应用的总体满意度为91.6%(55/60)。结论在日间腹股沟疝无张力修补术后使用HWD较传统盐袋压迫方法,可以更好地降低血清肿发生率,减轻术后疼痛,提高生活质量,患者使用满意度较高。

Enhanced boron neutron capture therapy(BNCT)through controlled drug release via boron-loaded nanofiber mats

Boron neutron capture therapy(BNCT)is a novel binary therapy combining boron targeted drugs and neutron irradiation,which can selectively and effectively kill cancer cells at the cellular scale.Controlled release of boron drug and its accumulation in tumor sites are the crux of BNCT.Here,we developed a^(10)B-boric acid(^(10)BA)-loaded nanofiber applying for BNCT by in situ administration.The nanofibers were obtained by electrospinning technique using polyethylene glycol/polylactide(PEO/PLA)block copolymers.By changing the ratio of hydrophilicity to hydrophobicity of the nanofibers,the controlled release and the effective accumulation of boron 10 isotope(^(10)B)were achieved in situ.The^(10)B content in tumor could reach to 2540μg/g,significantly exceeding the required level of 20–50μg/g for BNCT operation.Utilizing pertinent DNA damage experiments,direct evidence and quantified data of BNCT-induced DNA damage in tumor cells were obtained for the first time.Transcriptome sequencing was employed to predict the molecular mechanisms and potential signaling pathways of BNCT,providing theoretical basis for future combined therapies.The antitumor efficiency of BNCT was demonstrated by establishing mice model of subcutaneous tumor and tumor recurrence.The research presents a novel boron-loaded nanofiber mats for BNCT,which enables controlled drug release and holds significant potential in the treatment of unresectable or postoperative residual tumors.

Andrographolide Attenuates Noise-Induced Hearing Loss by Ameliorating Cochlear Inflammation

Objective:This study aimed to explore andrographolide's mechanism of action and its protective effect on noise-induced hearing loss(NIHL).Materials and Methods:A mice animal model for NIHL was established through exposure to broadband noise at 120 d B sound pressure level for 4 h.Transcriptomics analysis and pharmacodynamic experiments were carried out.Results:Andrographolide enters the inner ear and effectively prevents hearing damage following noise exposure in the mice model for permanent hearing loss.Moreover,treatment with andrographolide inhibited the excessive activation of inflammatory factors in the cochleae of noise-exposed mice.Conclusion:Andrographolide might be a promising candidate for auditory protective drug investigation.

A passive wireless surface acoustic wave(SAW)sensor system for detecting warfare agents based on fluoroalcohol polysiloxane film

Long-term monitoring of environmental warfare agengts is a challenge for chemical gas sensors.To address this issue,we developed a 433 MHz passive wireless surface acoustic wave(WSAW)gas sensor for dimethyl methylphosphonate(DMMP)detection.This WSAW gas sensor includes a YZ lithium niobate(LiNbO_(3))substrate with metallic interdigital transducers(IDTs)etched on it,and an antenna was placed near the IDT.A DMMP-sensitive viscoelastic polymer fluoroalcoholpolysiloxane(SXFA)film was prepared on a LiNbO_(3) substrate,and mode modeling coupling was used to optimize the design parameters.The sensor can function properly in an environments between−30℃ and 100℃ with humidity less than 60%RH.When the wireless transmission distance was within the range of 0-90 cm,the sensor noise increased with distance,and the stability was less than 32°/h.While optimizing the film thickness of SXFA,a relationship was observed between sensor sensitivity and film thickness.When the film thickness of SXFA reached 450 nm,the optimal value was reached.At a distance of 20 cm between the transmitting and receiving antennas,DMMP was detected at different concentrations with the developed WSAW gas sensor.The lower detection limit of DMMP was 0.48 mg/m^(3),the sensitivity of the sensor was 4.63°/(mg/m^(3)),and repeatable performance of the sensor was confirmed.

Perovskite quantum laser with enhanced population inversion driven by plasmon-induced hot electron transfer under potential shift polarization conditions

The hot electron transfer resulting in fluorescence enhancement is significantly meaningful for theory and experiment of the study on photoelectric devices.However,the laser emission based on direct hot electron transfer is difficult to realize because of the low transfer efficiency.To achieve a laser with a new-generation mechanism based on hot electron transfer,the photoelectric co-excitation is proposed for improving the efficiency of hot electron transfer.The lasing behavior at 532 nm is realized with a threshold of 5 kw cm^(-2)and 1μA,which can be considered as the hot electron transfer resulting in population inversion enhancement.Meanwhile,the lasing output power is 0.3 mW.The hot electrons transfer process was described via the transient absorption spectrum according to the improved ground-state bleaching and excited-state absorption signal in device ON.Through comparison with the optical pump only,the quantum efficiencies of hot electron generation(HEG)and hot electron transfer(HET)were increased~31%and 31%,respectively.Most importantly,a triple gain mode coupling device including local surface plasmon,hot electron transfer,and array oscillation was presented.Two modes of population inversion enhancement are proposed.This study can provide theoretical and experimental reference for the research of hot electron lasers and devices.

基于UPLC-ESI-HRMS^n技术的藏药塔黄的化学成分分析

目的采用UPLC-ESI-HRMS^n技术对藏药塔黄Rheumnobile的甲醇提取物进行分离鉴定分析。方法 ACQUITYUPLC BEH C18(100 mm×2.1 mm,1.7μm)色谱柱进行分离,甲醇-0.1%甲酸水溶液为流动相进行梯度洗脱,质谱采用正负离子监测模式、全扫描及自动触发二级质谱扫描进行数据采集。通过高分辨质谱数据,结合HMDB数据库、参考相关文献以及对照品比对,鉴定塔黄的主要化学成分。结果从塔黄的甲醇提取物中共鉴定了34个化学成分,包括蒽醌类4个、酚酸类15个、鞣质及鞣质前体类11个、有机酸4个。其中27个化学成分首次从该植物中分离得到。结论 UPLC-ESI-HRMS^n技术可快速、准确地鉴定塔黄中化学成分,为其药效物质基础及质量控制提供理论依据。

基于UHPLC-ESI-HRMS^n的清热灵颗粒中8种活性成分定量研究

目的基于UHPLC-ESI-HRMSn建立一种快速定量检测清热灵颗粒中甘草苷、牡荆苷、黄芩苷、芦丁、隐绿原酸、绿原酸、槲皮素、山柰酚的分析方法,为清热灵颗粒的质量控制提供实验基础。方法采用BEH C18(100 mm×2.1 mm,1.7μm)色谱柱,以甲醇-0.1%甲酸水溶液为流动相梯度洗脱,体积流量0.3 m L/min;质谱采用ESI离子源,全扫描模式进行检测;多批次清热灵颗粒定量测定结果采用SIMCA14.1软件进行模式判别分析,评估其质量。结果甘草苷、黄芩苷、芦丁、牡荆苷、槲皮素、绿原酸、隐绿原酸、山柰酚分别在570~9 127、10 032~160 500、293~4 690、1 625~26 000、40.5~645、41~1 325、44~1 413、13~209 ng/m L线性关系良好(r≥0.999 0);精密度、重复性、稳定性良好;加样回收率在98.83%~100.65%,RSD值均小于3%。5批所测清热灵颗粒中甘草苷、黄芩苷、芦丁、牡荆苷、槲皮素、绿原酸、隐绿原酸、山柰酚的平均质量分数分别为202.07~438.15、10 258.03~11 046.56、56.09~87.75、689.19~818.56、4.95~6.07、8.87~18.37、22.49~42.12、3.21~4.11μg/g;定量数据经SIMCA 14.1分析表明,5批清热灵颗粒质量标准偏差均在±2范围内。结论建立的定量测定方法简单快速,灵敏度度高,准确度好;方法学考察结果符合测定要求;可以作为清热灵颗粒多种活性成分定量方法,为其质量控制提供新的依据。

Development and validation of an individualized nomogram for early prediction of the duration of SARS-CoV-2 shedding in COVID-19 patients with non-severe disease

With the number of cases of coronavirus disease-2019(COVID-19)increasing rapidly,the World Health Organization(WHO)has recommended that patients with mild or moderate symptoms could be released from quarantine without nucleic acid retesting,and self-isolate in the community.This may pose a potential virus transmission risk.We aimed to develop a nomogram to predict the duration of viral shedding for individual COVID-19 patients.This retrospective multicentric study enrolled 135 patients as a training cohort and 102 patients as a validation cohort.Significant factors associated with the duration of viral shedding were identified by multivariate Cox modeling in the training cohort and combined to develop a nomogram to predict the probability of viral shedding at 9,13,17,and 21 d after admission.The nomogram was validated in the validation cohort and evaluated by concordance index(C-index),area under the curve(AUC),and calibration curve.A higher absolute lymphocyte count(P=0.001)and lymphocyte-to-monocyte ratio(P=0.013)were correlated with a shorter duration of viral shedding,while a longer activated partial thromboplastin time(P=0.007)prolonged the viral shedding duration.The C-indices of the nomogram were 0.732(95%confidence interval(CI):0.685-0.777)in the training cohort and 0.703(95%CI:0.642-0.764)in the validation cohort.The AUC showed a good discriminative ability(training cohort:0.879,0.762,0.738,and 0.715 for 9,13,17,and 21 d;validation cohort:0.855,0.758,0.728,and 0.706 for 9,13,17,and 21 d),and calibration curves were consistent between outcomes and predictions in both cohorts.A predictive nomogram for viral shedding duration based on three easily accessible factors was developed to help estimate appropriate self-isolation time for patients with mild or moderate symptoms,and to control virus transmission.

Stabilising control for a class of chaotic systems based on adaptive fuzzy logic systems

For a class of chaotic systems with unknown functions and disturbances,asymptotic stabilisation of the chaotic systems is achieved by designing a stability controller based on the adaptive fuzzy logic systems.At first,based on the universal approximation property of fuzzy logic systems,the Mamdani-type fuzzy logic systems with the parameter adaptive laws are designed utilising the data information sampled from the inputs and outputs of unknown functions in the chaotic systems,then the fuzzy logic systems are used to design the stability controller with three parameter adaptive laws,but the three parameters have no relationship with the number of fuzzy rules,so the stability controller is not only able to achieve asymptotic stabilisation for the chaotic system’s states,but also to reduce the number of fuzzy rules and the no-line computational burden significantly.Finally,simulations are used to show the validity of the stabilisation method.