债务展期、期限结构与企业创新

企业创新需要持续稳定的资金支持,但中国企业融资主要依赖的银行贷款却是以短期贷款为主,故债务展期对企业创新的影响尤其值得关注。利用2007年银行贷款展期政策调整的准自然实验,本文实证研究发现:(1)银行收紧贷款展期政策后,原本更依赖短期贷款的企业创新活动不仅未有减少,反而明显增加,专利申请和发明专利申请数量平均增长了近28%。(2)渠道检验显示,银行收紧贷款展期后,原本更依赖短期贷款的企业显著增加了长期贷款且债务融资成本并未显著提高,面临的融资约束程度明显降低,无形资本投资明显增加。(3)异质性检验结果显示,上述现象仅出现在大企业和国有企业,这可能是因为大企业和国有企业有较强的贷款谈判能力。总之,本文的研究结论表明,银行收紧贷款展期使企业从短期贷款转向长期贷款,融资稳健性的提升有利于企业创新,但在此过程中要特别重视可能对民营中小企业的不利冲击。

Self-confocal NIR-II fluorescence microscopy for multifunctional in vivo imaging

Fluorescence imaging in the second near-infrared window(NIR-II,900–1880 nm)with less scattering background in biological tissues has been combined with the confocal microscopic system for achieving deep in vivo imaging with high spatial resolution.However,the traditional NIR-IIfluorescence confocal microscope with separate excitation focus and detection pinhole makes it possess low confocal e±ciency,as well as di±cultly to adjust.Two types of upgraded NIR-IIfluorescence confocal microscopes,sharing the same pinhole by excitation and emission focus,leading to higher confocal e±ciency,are built in this work.One type is-ber-pinhole-based confocal microscope applicable to CW laser excitation.It is constructed forfluorescence intensity imaging with large depth,high stabilization and low cost,which could replace multiphotonfluorescence microscopy in some applications(e.g.,cerebrovascular and hepatocellular imaging).The other type is air-pinhole-based confocal microscope applicable to femtosecond(fs)laser excitation.It can be employed not only for NIR-IIfluorescence intensity imaging,but also for multi-channelfluorescence lifetime imaging to recognize different structures with similarfluorescence spectrum.Moreover,it can be facilely combined with multiphotonfluorescence microscopy.A single fs pulsed laser is utilized to achieve up-conversion(visible multiphotonfluorescence)and down-conversion(NIR-II one-photonfluorescence)excitation simultaneously,extending imaging spectral channels,and thus facilitates multi-structure and multi-functional observation.

Sinensetin protects against periodontitis through binding to Bach1 enhancing its ubiquitination degradation and improving oxidative stress

Periodontitis is a chronic inflammatory and immune reactive disease induced by the subgingival biofilm.The therapeutic effect for susceptible patients is often unsatisfactory due to excessive inflammatory response and oxidative stress.Sinensetin(Sin)is a nature polymethoxylated flavonoid with anti-inflammatory and antioxidant activities.Our study aimed to explore the beneficial effect of Sin on periodontitis and the specific molecular mechanisms.We found that Sin attenuated oxidative stress and inflammatory levels of periodontal ligament cells(PDLCs)under inflammatory conditions.Administered Sin to rats with ligation-induced periodontitis models exhibited a protective effect against periodontitis in vivo.By molecular docking,we identified Bach1 as a strong binding target of Sin,and this binding was further verified by cellular thermal displacement assay and immunofluorescence assays.Chromatin immunoprecipitation-quantitative polymerase chain reaction results also revealed that Sin obstructed the binding of Bach1 to the HMOX1 promoter,subsequently upregulating the expression of the key antioxidant factor HO-1.Further functional experiments with Bach1 knocked down and overexpressed verified Bach1 as a key target for Sin to exert its antioxidant effects.Additionally,we demonstrated that Sin prompted the reduction of Bach1 by potentiating the ubiquitination degradation of Bach1,thereby inducing HO-1 expression and inhibiting oxidative stress.Overall,Sin could be a promising drug candidate for the treatment of periodontitis by targeting binding to Bach1.

Risk factors,prognostic factors,and nomograms for distant metastasis in patients with diagnosed duodenal cancer:A population-based study

BACKGROUND Duodenal cancer is one of the most common subtypes of small intestinal cancer,and distant metastasis(DM)in this type of cancer still leads to poor prognosis.Although nomograms have recently been used in tumor areas,no studies have focused on the diagnostic and prognostic evaluation of DM in patients with primary duodenal cancer.AIM To develop and evaluate nomograms for predicting the risk of DM and person-alized prognosis in patients with duodenal cancer.METHODS Data on duodenal cancer patients diagnosed between 2010 and 2019 were extracted from the Surveillance,Epidemiology,and End Results database.Univariate and multivariate logistic regression analyses were used to identify independent risk factors for DM in patients with duodenal cancer,and univariate and multivariate Cox proportional hazards regression analyses were used to determine independent prognostic factors in duodenal cancer patients with DM.Two novel nomograms were established,and the results were evaluated by receiver operating characteristic(ROC)curves,calibration curves,and decision curve analysis(DCA).RESULTS A total of 2603 patients with duodenal cancer were included,of whom 457 cases(17.56%)had DM at the time of diagnosis.Logistic analysis revealed independent risk factors for DM in duodenal cancer patients,including gender,grade,tumor size,T stage,and N stage(P<0.05).Univariate and multivariate COX analyses further identified independent prognostic factors for duodenal cancer patients with DM,including age,histological type,T stage,tumor grade,tumor size,bone metastasis,chemotherapy,and surgery(P<0.05).The accuracy of the nomograms was validated in the training set,validation set,and expanded testing set using ROC curves,calibration curves,and DCA curves.The results of Kaplan-Meier survival curves(P<0.001)indicated that both nomograms accurately predicted the occurrence and prognosis of DM in patients with duodenal cancer.CONCLUSION The two nomograms are expected as effective tools for predicting DM risk in duodenal cancer patients and offering personalized prognosis predictions for those with DM,potentially enhancing clinical decision-making.

Application of prostate resectoscope in the treatment of massive rectal bleeding after transrectal prostate puncture

BACKGROUND Ultrasound-guided prostate biopsy is a reliable diagnostic procedure for prostate cancer diagnosis with minimal procedure-related trauma.However,complications,such as massive rectal bleeding may occur after the puncture.We hypothesized that using a transrectal resectoscope could help treat massive rectal bleeding after transrectal prostate punctures.AIM To identify a simple and effective treatment for massive rectal bleeding after transrectal prostate punctures.METHODS Patients requiring treatment for massive rectal bleeding after transrectal prostate punctures were included.A SIMAI resectoscope was inserted through the anus.Direct electrocoagulation was performed for superficial bleeding points.Part of the rectal mucosa or surface muscle layer was removed to expose deep bleeding points,followed by electrocoagulation.An electric cutting ring was used to compress and stop the bleeding for jet-like points before electrocoagulation.The fluid color in the drainage tube was monitored postoperatively for continuous bleeding.RESULTS Eight patients were included from 2012 to 2022.None of the patients with massive rectal bleeding after the transrectal prostate punctures improved with conventional conservative and blood transfusion treatments.Two patients had an inferior artery embolism,and digital subtraction angiography was ineffective.All patients received emergency transanal prostate resection,which immediately stopped the bleeding.Four days after the procedure,the patients had recovered and were discharged.CONCLUSION Using a transanal prostate resection instrument is a simple,safe,and effective method for treating massive rectal bleeding after transrectal prostate punctures.

临床实习生实习期压力源特征及其与心理健康状况的相关性研究

目的分析临床实习生实习期压力源特征及其与心理健康状况的相关性。方法选择安宁市第一人民医院2022年6-8月份实施岗前培训的实习生221人为研究对象,对所有实习生在实习期间以心理健康临床自评量表(Mental Health Clini⁃cal Self reporting Inventory,SCL-90)进行评估,收集实习生实习期压力源特征,并以Logistic多元分析影响其心理健康状况的相关性。结果本研究得出,临床实习生实习期压力平均分为(1.16±0.59)分,根据压力源平均按照由高至低的顺序为考试与就业、临床知识与技能、人际关系、面对患者的工作态度、临床医疗条件以及工作负荷量。针对不同生源的实习生压力源进行分析,发现,除临床医疗条件之外,其余项目总体差异不存在统计学意义(P>0.05);针对不同性别的实习生压力源进行分析,发现,在人际关系、临床知识与技能两方面对比无统计学意义(P>0.05)。排除人际关系与敌对、恐怖、知识与技能、精神病性能同敌对、偏执,工作负荷量与偏执无相关性,压力源各维度分值与躯体化、抑郁、强迫、焦虑、敌对、恐怖等因子的分值均具有显著相关性。结论医学院实习生在实习期多存在心理压力,不仅对其心理健康产生一定影响,也干扰了实习生在临床的工作与学习,建议从就业、心理、学业等方向对实习生给予指导,旨在帮助其减轻压力,培养实习生良好的心理素质。

中国对外援助促进数字经济的发展?新兴市场国家的经验

本文利用中国对外援助和各国数字经济发展水平的相关数据,实证检验了中国与数字经济相关的对外援助对当地数字经济发展水平的影响。本文发现,中国在数字经济方面的对外援助能够显著促进当地数字经济发展。在子样本分析、倾向得分匹配、工具变量法等一系列稳健性检验中,该结论依然成立。异质性检验表明,对于那些被中国援助的累积金额相对较高、经济发展水平相对较高、贫困程度相对较低、服务业发展水平相对较差、初始数字经济发展水平相对较低的国家而言,中国援助对数字经济的促进效应更显著。在同一国家内部,中国对外援能助能促进男性、25岁及以上、受教育水平相对较高、相对富有和就业人群更多参与数字经济交易。进一步的机制分析结果表明,中国与数字经济相关的对外援助主要通过提高当地互联网普及率来推动数字经济的发展。最后,中国在数字经济方面的援助能够降低当地的收入不平等程度,这对于改善收入不平等这一全球治理问题具有重要意义。

基于临床可用的亚甲基蓝近红外二区成像用于泌尿系统结构及功能成像的研究

精准的结构和功能成像对于泌尿系统疾病的诊断和预后至关重要。近红外二区(second near-infrared,NIR-Ⅱ;1000~1700 nm)荧光生物成像相较于传统的荧光生物成像具有更高的空间分辨率、更深的穿透力和更好的信噪比,但其临床适用性有限。本文首次报道了基于临床可用且经肾脏排泄的荧光染料亚甲蓝(methylene blue,MB)NIR-Ⅱ活体泌尿系统荧光成像,该方法不仅可以实现清晰的有创/无创尿路造影,而且可以有效且无创地检测肾功能。以上研究结果表明MB辅助的NIR-Ⅱ荧光成像在临床及基础研究中的泌尿系统结构和功能成像中具有巨大前景。

Oscillating field stimulation promotes neurogenesis of neural stem cells through miR-124/Tal1 axis to repair spinal cord injury in rats

Spinal cord injury often leads to severe motor and sensory deficits,and prognosis using the currently available therapies remains poor.Therefore,we aimed to explore a novel therapeutic approach for improving the prognosis of spinal cord injury.In this study,we implanted oscillating field stimulation devices and transplanted neural stem cells into the thoracic region(T9–T10)of rats with a spinal cord contusion.Basso-Beattie-Bresnahan scoring revealed that oscillating field stimulation combined with neural stem cells transplantation promoted motor function recovery following spinal cord injury.In addition,we investigated the regulation of oscillating field stimulation on the miR-124/Tal1 axis in neural stem cells.Transfection of lentivirus was performed to investigate the role of Tal1 in neurogenesis of neural stem cells induced by oscillating field stimulation.Quantitative reverse transcription-polymerase chain reaction,immunofluorescence and western blotting showed that oscillating field stimulation promoted neurogenesis of neural stem cells in vitro and in vivo.Hematoxylin and eosin staining showed that oscillating field stimulation combined with neural stem cells transplantation alleviated cavities formation after spinal cord injury.Taking the results together,we concluded that oscillating field stimulation decreased miR-124 expression and increased Tal1 content,thereby promoting the neurogenesis of neural stem cells.The combination of oscillating field stimulation and neural stem cells transplantation improved neurogenesis,and thereby promoted structural and functional recovery after spinal cord injury.

Lipid droplets imaging with three-photon microscopy

Lipid droplets(LDs)participate in many physiological processes,the abnormality of which will cause chronic diseases and pathologies such as diabetes and obesity.It is crucial to monitor the distribution of LDs at high spatial resolution and large depth.Herein,we carried three-photon imaging of LDs in fat liver.Owing to the large three-photon absorption cross-section of the luminogen named NAP-CF_(3)(1:67×10^(-79) cm^(6) s^(2)),three-photon fluorescence fat liver imaging reached the largest depth of 80μm.Fat liver diagnosis was successfully carried out with excellent performance,providing great potential for LDs-associated pathologies research.

The Effect of Comfort Nursing on the Compliance and Efficacy of Treatment for Children with Acute Otitis Media Caused by Upper Respiratory Tract Infection

Objective:To explore and analyze the clinical effect of comfort nursing on children with acute otitis media.Methods:62 children with acute otitis media caused by upper respiratory tract infection who visited the outpatient clinic of our hospital from June 2022 to June 2023 were selected for this study.They were divided into a study group(n=31)and a control group(n=31).Children in the control group received basic care,while children in the study group received comfort nursing along with basic care.The hearing thresholds,body temperature,treatment compliance,and nursing satisfaction of the two groups of children were compared.Results:After the nursing intervention,the hearing threshold and average body temperature of the children in the study group were lower than those in the control group(P<0.05);the treatment compliance of the children in the study group was higher than that in the control group(P<0.05);the nursing satisfaction of the study group was higher than that of the control group(P<0.05).Conclusion:Comfort nursing can improve the treatment effect,treatment compliance,and nursing satisfaction of children with children with acute otitis media caused by upper respiratory tract infection.

Management of granulomatous lobular mastitis: an international multidisciplinary consensus(2021 edition)

Granulomatous lobular mastitis(GLM) is a rare and chronic benign inflammatory disease of the breast. Difficulties exist in the management of GLM for many front-line surgeons and medical specialists who care for patients with inflammatory disorders of the breast. This consensus is summarized to establish evidence-based recommendations for the management of GLM. Literature was reviewed using PubMed from January 1, 1971 to July 31, 2020. Sixty-six international experienced multidisciplinary experts from 11 countries or regions were invited to review the evidence.Levels of evidence were determined using the American College of Physicians grading system, and recommendations were discussed until consensus. Experts discussed and concluded 30 recommendations on historical definitions,etiology and predisposing factors, diagnosis criteria, treatment, clinical stages, relapse and recurrence of GLM. GLM was recommended as a widely accepted definition. In addition, this consensus introduced a new clinical stages and management algorithm for GLM to provide individual treatment strategies. In conclusion, diagnosis of GLM depends on a combination of history, clinical manifestations, imaging examinations, laboratory examinations and pathology.The approach to treatment of GLM should be applied according to the different clinical stage of GLM. This evidencebased consensus would be valuable to assist front-line surgeons and medical specialists in the optimal management of GLM.

Decline of serum CA724 as a probable predictive factor for tumor response during chemotherapy of advanced gastric carcinoma

Objective： To evaluate the predictive value of decline in the serum level of carbohydrate antigen 724 （CA724） on tumor response during the chemotherapy in patients with advanced gastric carcinoma （GC）. Methods= The serum CA724 level was determined by electrochemiluminescence immunoassay, while the objective response rate （eRR） was assessed according to response evaluation criteria in solid tumors （RECIST）. The association of the changes of serum concentration of CA724 with eRR was analyzed. Results： The eRR in CA724 （pretreatment serum level） high and low groups was 32.3% （20/62） and 52.8% （19/36）, respectively （P=0.045）. The relationship between the reduction of CA724 and the eRR was statistically significant （P=0.044）. Receiver operating characteristic （ROC） curve established the best cutoff value of the decrease ratio of CA724 as 20.5%. Conclusions： CA724 decline seems to indicate chemotherapy efficacy in patients with advanced GC, and an average drop of 20.5% in serum CA724 appears to predict the sensitivity to chemotherapy.

PD-L1 expression and its effect on clinical outcomes of EGFRmutant NSCLC patients treated with EGFR-TKIs

Objective:Epidermal growth factor receptor(EGFR)activation was reported to upregulate programmed death-ligand 1(PD-L1)expression in lung cancer cells and subsequently contribute to immune escape,indicating its critical role in EGFR-driven lung tumors.This study characterized PD-L1 expression in patients with surgically resected EGFR-mutant non-small cell lung cancer(NSCLC).The effect of PD-L1 expression on clinical outcomes was also investigated in advanced EGFR-mutant NSCLC treated with EGFR-tyrosine kinase inhibitors(TKIs).Methods:In total,73 patients with surgically resected NSCLC and EGFR mutations were identified.PD-L1 expression and CD8+tumor-infiltrating lymphocyte(TIL)density were assessed by immunohistochemistry.A literature review of publications that assessed the predictive and prognostic value of PD-L1 expression in advanced EGFR-mutant NSCLC patients treated with EGFR-TKIs was performed.Results:Nineteen(26.0%)patients were positive for PD-L1 expression,which was significantly associated with concomitant KRAS mutation(P=0.020)and marginally associated with higher CD8+TILs density(P=0.056).Positive PD-L1 expression was associated with markedly inferior overall survival(OS)in multivariate analysis(P=0.032).The combination of PD-L1 and CD8+TILs expression could be used to stratify the population into three groups with distinct prognoses.A meta-analysis of six publications showed that positive PD-L1 expression was not associated with OS[hazard ratio(HR)=0.90;95%confidence interval(CI),0.42–1.38]or progression-free survival(HR=1.03;95 CI,0.73–1.33)in advanced EGFR-mutant NSCLC patients receiving EGFR-TKIs.Conclusions:PD-L1 expression tended to correlate with CD8+TIL expression,concomitant KRAS mutation,and poor survival in surgically resected EGFR-mutant NSCLC.PD-L1 expression was neither the predictive nor the prognostic factor in advanced EGFR-mutant NSCLC patients treated with EGFR-TKIs.

The transcription factor OpWRKY2 positively regulates the biosynthesis of the anticancer drug camptothecin in Ophiorrhiza pumila

The limited bioavailability of plant-derived natural products with anticancer activity poses major challenges to the pharmaceutical industry.An example of this is camptothecin,a monoterpene indole alkaloid with potent anticancer activity that is extracted at very low concentrations from woody plants.Recently,camptothecin biosynthesis has been shown to become biotechnologically amenable in hairy-root systems of the natural producer Ophiorrhiza pumila.Here,time-course expression and metabolite analyses were performed to identify novel transcriptional regulators of camptothecin biosynthesis in O.pumila.It is shown here that camptothecin production increased over cultivation time and that the expression pattern of the WRKY transcription factor encoding gene OpWRKY2 is closely correlated with camptothecin accumulation.Overexpression of OpWRKY2 led to a more than three-fold increase in camptothecin levels.Accordingly,silencing of OpWRKY2 correlated with decreased camptothecin levels in the plant.Further detailed molecular characterization by electrophoretic mobility shift,yeast one-hybrid and dual-luciferase assays showed that OpWRKY2 directly binds and activates the central camptothecin pathway gene OpTDC.Taken together,the results of this study demonstrate that OpWRKY2 acts as a direct positive regulator of camptothecin biosynthesis.As such,a feasible strategy for the over-accumulation of camptothecin in a biotechnologically amenable system is presented.

Transarterial administration of integrin inhibitor loaded nanoparticles combined with transarterial chemoembolization for treating hepatocellular carcinoma in a rat model

AIM: To compare the effect of transarterial chemoembolization(TACE) plus GRGDSP(Gly-Arg-Gly-Asp-SerPro, integrin-inhibitor) loaded nanoparticles with TACE alone or TACE + GRGDSP in a rat model of liver tumor. METHODS: Morris hepatoma 3924 A tumors were implanted in the livers of 30 ACI rats. The ACI rats were divided randomly into three groups(10 animals each). Tumor volume before treatment(V1) was examined by magnetic resonance imaging(MRI), and then, after laparotomy and placement of a PE-10 catheter into the hepatic artery, the following interventional protocols were performed: TACE(mitomycin C + lipiodol + degradable starch microspheres) + GRGDSP loaded nanoparticles for group A; TACE + GRGDSP for group B(control group 1); TACE alone for group C(control group 2). Tumor volume(V2) was assessed by MRI and the mean ratio of the post-treatment to pretreatment tumor volumes(V2/V1) was calculated. Immunohistochemical analysis was performed to assess the quantification of matrix metalloprotein 9(MMP-9) and vascular endothelial growth factor(VEGF) positive tumor cells in each treatment group.RESULTS: The mean tumor growth ratios(V2/V1) were 1.3649 ± 0.1194 in group A, 2.0770 ± 0.1595 in group B, and 3.2148 ± 0.1075 in group C. Compared with groups B and C, group A showed a significant reduction in tumor volume. Lower expression of MMP-9 and VEGF in hepatocellular carcinoma was observed in group A than in groups B and C. The angiogenesis of tumor was evaluated using anti-VEGF antibodies, and the metastasis of tumor was assessed using antiMMP-9 antibody. MMP-9 and VEGF were expressed in all specimens. The immunoexpression of these proteins was confirmed by the presence of red cytoplasmic staining in tumor cells. Lower expression of MMP-9 and VEGF in hepatocellular carcinoma was observed in group A than in groups B and C.CONCLUSION: Transarterial administration of integrin inhibitor loaded nanoparticles combined with TACE evidently retards tumor growth and intrahepatic metastases compared with TACE alone or TACE plus integrin inhibitor in an animal model of hepatocellular carcinoma.

Aggregation-induced emission luminogen for in vivo three-photon fuorescence lifetime microscopic imaging

Compared with visible light,near infrared(NIR)light has deeper penetration in biological tisues.Three-photon fuorescence microscopy(3PFM)can effectively utilize the NIR excitation to obtain high-contrast images in the deep tisue.However,the weak three photon fluorescence signals may be not well presented in the traditional fuorescence intensity imaging mode.Fluorescence lifetime of certain probes is insensitive to the intensity of the excitation laser.Moreover,fluorescence lifetimne imaging microscopy(FLIM)can detect weak signals by utilizing time correlated single photon counting(TCSPC)technique.Thus,it would be an improved strategy to combine the 3PFM imaging with the FLIM together.Herein,DCDPP-2TPA,a novel agegation-induced emission luminogen(AIEgen),was adopted as the fluorescent probes.The three-photon absorption cros-section of the AlEgen,which has a deep-red fluorescence emission,was proved to be large.DCDPP-2TPA nanoparticles were synthesized,and the three photon fluorescence lifetime of which was measured in water.Moreover,in vrivo thre-photon fuorescence lifetime microscopic imaging of a craniotomy mouse was conducted via a home made optical system.High contrast cerebrovascular images of different vertical depths were obtained and the maximun depth was about 600 pumn.Even reaching the depth of 600 pum,tiny capillary vessels as small as 1.9 pum could still be distinguished.The three photon fuorescence lifetimes of the capillaries in some representative images were in accord with that of DCDPP-2TPA nanoparticles in water.A vivid 3D reconstruction was further organized to present a wealth of lifetime information.In the future,the combination strategy of 3PFM and FLIM could be further applied in the brain functional imaging.

Aurivillius compound Bi_(5)Ti_(3)CrO_(15) as a visible-light-active photocatalyst for hydrogen production from water

Layered Aurivillius compound Bi_(5)Ti_(3)CrO_(15) has been synthesized by a hydrothermal method for the application as a photocatalyst to liberate hydrogen from water. Bi_(5)Ti_(3)CrO_(15) owns a narrow band gap (Eg ~2.46 eV) and shows stable photocatalytic activity under both full range (λ ≥250 nm) and visible light illumination (λ ≥420 nm). A short hydrothermal reaction time is critical to achieve high photocatalytic activity as defects such as Cr^(6+) and Bi^(5+) can be avoided. An AQE as high as 3.66% at 420 nm ± 20 nm has been recorded, warranting promising application in the field of solar energy conversions. DFT calculation reveals the important role of Cr^(3+) cations for visible light sensitivity of Bi_(5)Ti_(3)CrO_(15).

Protein corona mediated liposomal drug delivery for bacterial infection management

Liposomes have been widely investigated as a class of promising antibiotic delivery systems for the treatment of life-threatening bacterial infections.However,the inevitable formation of protein corona on the liposomal surface can heavily impact in vivo performance.A better understanding of the effects of protein corona on liposomal behavior can significantly improve antibacterial liposomal drug development.Here,the critical role of protein corona in mediating liposome-bacteria interactions was elucidated.Adsorption of negatively charged protein on cationic liposome weakened electrostatic attractionenhanced liposomal binding to the bacteria.Cumulative complement deposition on anionic liposome composed of phosphatidylglycerol(DSPG s Lip)contributed to a superior binding affinity of DSPG s Lip to planktonic bacteria and biofilms,which was exploited to enhance bacteria-targeted drug delivery.In both S.aureus-related osteomyelitis and pneumonia mice models,DSPG s Lip was demonstrated as a promising antibiotic nanocarrier for managing MRSA infection,indicating the benefits of lipid composition-based protein corona modulation in liposomal antibiotic delivery for bacterial infection treatment.

Influence of Thermal Load on Mechanical Property of Cemented Carbide Material and Heavy Cemented Carbide Inserts Life

A large amount of cutting heat is produced during the heavy cutting process,and insert life is restricted by the effect of thermal load.The thermal load experiment of cemented carbide SCS,WF and YT15 is carried out,and the results show that the bending strength and fracture toughness of cemented carbide material decrease obviously under cyclic thermal load,while in the cooling process,the material mechanical property changes worse suddenly.The high-temperature mechanical property of SCS is the most stable,and that of YT15 is the worst.Further,a relation model among cutting temperature,cutting parameters and insert life is established.Finally,the measures to improve heavy cemented carbide inserts life are summarized from the aspects of cutting parameters selection,insert optimization design and TiCN,Al2O3,TiN complex insert coating.The research results are expected to provide support and reference for heavy cutting technology and insert technology.