Porous liquid-conducting micro-heat exchangers have garnered considerable attention for their role in efficient heat dissipation in small electronic devices.This demand highlights the need for advanced mathematical mo...Porous liquid-conducting micro-heat exchangers have garnered considerable attention for their role in efficient heat dissipation in small electronic devices.This demand highlights the need for advanced mathematical models to optimize the selection of mixed heat exchange media and equipment design.A capillary bundle evaporation model for porous liquid-conducting media was developed based on the conjugate mass transfer evaporation rate prediction model of a single capillary tube,supplemented by mercury injection experimental data.Theoretical and experimental comparisons were conducted using 1,2-propanediol-glycerol(PG-VG)mixtures at molar ratios of 1:9,3:7,5:5,and 7:3 at 120,150,and 180℃.The Jouyban-Acree model was implemented to enhance the evaporation rate predictions.For the 7:3 PG-VG mixture at 180℃under the experimental conditions of the thermal medium,the model's error reduced from 16.75%to 10.84%post-correction.Overall,the mean relative error decreased from 11.76%to 5.98%after correction.展开更多
The formation of nerve bundles,which is partially regulated by neural cell adhesion molecule 1(NCAM1),is important for neural network organization during peripheral nerve regeneration.However,little is known about how...The formation of nerve bundles,which is partially regulated by neural cell adhesion molecule 1(NCAM1),is important for neural network organization during peripheral nerve regeneration.However,little is known about how the extracellular matrix(ECM)microenvironment affects this process.Here,we seeded dorsal root ganglion tissue blocks on different ECM substrates of peripheral nerve ECM-derived matrixgel,Matrigel,laminin 521,collagen I,and collagen IV,and observed well-aligned axon bundles growing in the peripheral nerve ECM-derived environment.We confirmed that NCAM1 is necessary but not sufficient to trigger this phenomenon.A protein interaction assay identified collagen VI as an extracellular partner of NCAM1 in the regulation of axonal fasciculation.Collagen VI interacted with NCAM1 by directly binding to the FNIII domain,thereby increasing the stability of NCAM1 at the axolemma.Our in vivo experiments on a rat sciatic nerve defect model also demonstrated orderly nerve bundle regeneration with improved projection accuracy and functional recovery after treatment with 10 mg/m L Matrigel and 20μg/m L collagen VI.These findings suggest that the collagen VI-NCAM1 pathway plays a regulatory role in nerve bundle formation.This study was approved by the Animal Ethics Committee of Guangzhou Medical University(approval No.GY2019048)on April 30,2019.展开更多
目的探讨重症监护室(ICU)医务人员采用1小时集束化治疗策略(1 h bundle)救治脓毒症的执行情况,并分析脓毒症/感染性休克患者28 d预后影响因素.方法选择2019年6月-2022年7月新疆医科大学第一附属医院重症监护病房(ICU)、急诊重症监护病房...目的探讨重症监护室(ICU)医务人员采用1小时集束化治疗策略(1 h bundle)救治脓毒症的执行情况,并分析脓毒症/感染性休克患者28 d预后影响因素.方法选择2019年6月-2022年7月新疆医科大学第一附属医院重症监护病房(ICU)、急诊重症监护病房(EICU)、呼吸重症监护病房(RICU)内符合脓毒症3.0定义与诊断标准患者,根据28 d预后情况分为生存组100例与死亡组91例,收集病原菌与感染部位、1 h bundle执行情况和28 d预后结局等资料;分析影响预后的危险因素并绘制受试者工作特征(ROC)曲线,进一步评估不同指标对脓毒症/感染性休克患者的预测价值.结果191例脓毒症/感染性休克患者共培养分离病原菌295株,其中革兰阴性菌212株占71.86%,革兰阳性菌50株占16.95%,真菌32株占10.85%;感染部位以肺部、腹腔和皮肤软组织为主;1 h bundle策略总体达标率为9.95%,两组达标率差异无统计学意义;28 d病死率为47.64%;年龄(AUC=0.620)、脓毒症相关序贯器官衰竭评分(SOFA)(AUC=0.730)、急性生理与慢性健康Ⅱ(APACHEⅡ)评分(AUC=0.662)、6 h乳酸(AUC=0.590)、24 h乳酸(AUC=0.681)是脓毒症/感染性休克患者28 d预后影响因素;ROC曲线结果显示,年龄、SOFA评分、APACHEⅡ评分、6 h乳酸、24 h乳酸对患者预后情况均有一定预测价值(P<0.05).结论本地区ICU内1 hbundle策略达标率不理想,应探寻行之有效策略提高对于循证指南执行率,进而有效降低脓毒症造成的威胁.展开更多
Several clinical studies have reported that hearing loss is correlated with autism in children.However,little is known about the underlying mechanism between hearing loss and autism.p21-activated kinases(PAKs)are a fa...Several clinical studies have reported that hearing loss is correlated with autism in children.However,little is known about the underlying mechanism between hearing loss and autism.p21-activated kinases(PAKs)are a family of serine/threonine kinases that can be activated by multiple signaling molecules,particularly the Rho family of small GTPases.Previous studies have shown that Pak1 mutations are associated with autism.In the present study,we take advantage of Pak1 knockout(Pak1a/a)mice to investigate the role of PAK1 in hearing function.We find that PAK1 is highly expressed in the postnatal mouse cochlea and that PAK1 deficiency leads to hair cell(HC)apoptosis and severe hearing loss.Further investigation indicates that PAK1 deficiency downregulates the phosphorylation of cofilin and ezrin-radixin-moesin and the expression of b II-spectrin,which further decreases the HC synapse density in the basal turn of cochlea and disorganized the HC stereocilia in all three turns of cochlea in Pak1à/àmice.Overall,our work demonstrates that the autism-related gene Pak1 plays a crucial role in hearing function.As the first candidate gene linking autism and hearing loss,Pak1 may serve as a potential target for the clinical diagnosis of autism-related hearing loss.展开更多
A 3D motion and geometric information system of single-antenna radar is proposed,which can be supported by spotlight synthetic aperture radar（SAR） system and inverse SAR（ISAR） system involving relative 3D motion o...A 3D motion and geometric information system of single-antenna radar is proposed,which can be supported by spotlight synthetic aperture radar（SAR） system and inverse SAR（ISAR） system involving relative 3D motion of the rigid target.In this system,applying the geometry invariance of the rigid target,the unknown 3D shape and motion of the radar target can be reconstructed from the 1D range data of some scatterers extracted from the high-resolution range image.Compared with the current 1D-to-3D algorithm,in the proposed algorithm,the requirement of the 1D range data is expanded to incomplete formation involving large angular motion of the target and hence,the quantity of the scatterers and the abundance of 3D motion are enriched.Furthermore,with the three selected affine coordinates fixed,the multi-solution problem of the reconstruction is solved and the technique of nonlinear optimization can be successfully utilized in the system.Two simulations are implemented which verify the higher robustness of the system and the better performance of the 3D reconstruction for the radar target with unknown relative motion.展开更多
目的分析肌动蛋白结合蛋白1(fascin actin-bundling protein 1,FSCN1)在头颈部鳞状细胞癌(head and neck squamous cell carcinoma,HNSCC)中的表达及与预后的关系。方法TCGA数据库中下载HNSCC的RNASeq数据和临床特征数据,分析FSCN1在HN...目的分析肌动蛋白结合蛋白1(fascin actin-bundling protein 1,FSCN1)在头颈部鳞状细胞癌(head and neck squamous cell carcinoma,HNSCC)中的表达及与预后的关系。方法TCGA数据库中下载HNSCC的RNASeq数据和临床特征数据,分析FSCN1在HNSCC中的表达及与预后的关系。LinkedOmics数据库分析HNSCC中与FSCN1的共表达基因并进行富集分析。结果正常组织及HNSCC组织中FSCN1表达量分别为6.97(5.79,7.52)和9.10(8.54,9.56),FSCN1在HNSCC组织中高表达(P<0.01);HNSCC组织及癌旁组织中FSCN1表达量分别为9.395(8.966,9.764)和7.084(5.907,7.543),HNSCC组织中FSCN1表达量升高(P<0.01)。N分期、淋巴及血管侵犯及FSCN1表达与患者的生存相关(P<0.05)。FSCN1的共表达基因主要富集的生物学过程包括细胞黏附、血管生成等,分子功能包括细胞黏附分子结合、钙黏着蛋白绑定等,细胞组分包括黏着斑、质膜等,KEGG通路包括黏着斑、肌动蛋白骨架的调控等信号通路。免疫组化证实,与癌旁组织相比,HNSCC患者癌组织中FSCN1表达水平升高(χ^(2)=19.285,P<0.001),FSCN1主要表达于细胞胞浆中。结论FSCN1与HNSCC临床预后显著相关且可作为靶向治疗的一个新靶点。展开更多
基金the funding support of National Natural Science Foundation of China(21978204)。
文摘Porous liquid-conducting micro-heat exchangers have garnered considerable attention for their role in efficient heat dissipation in small electronic devices.This demand highlights the need for advanced mathematical models to optimize the selection of mixed heat exchange media and equipment design.A capillary bundle evaporation model for porous liquid-conducting media was developed based on the conjugate mass transfer evaporation rate prediction model of a single capillary tube,supplemented by mercury injection experimental data.Theoretical and experimental comparisons were conducted using 1,2-propanediol-glycerol(PG-VG)mixtures at molar ratios of 1:9,3:7,5:5,and 7:3 at 120,150,and 180℃.The Jouyban-Acree model was implemented to enhance the evaporation rate predictions.For the 7:3 PG-VG mixture at 180℃under the experimental conditions of the thermal medium,the model's error reduced from 16.75%to 10.84%post-correction.Overall,the mean relative error decreased from 11.76%to 5.98%after correction.
基金supported by the National Natural Science Foundation of China,No.31800892(to JLZ)the Natural Science Foundation of Guangdong Province of China,No.2018A030310254(to YY)a grant from Guangzhou Medical University Start-up Project of China,No.B195002002048(to JLZ)。
文摘The formation of nerve bundles,which is partially regulated by neural cell adhesion molecule 1(NCAM1),is important for neural network organization during peripheral nerve regeneration.However,little is known about how the extracellular matrix(ECM)microenvironment affects this process.Here,we seeded dorsal root ganglion tissue blocks on different ECM substrates of peripheral nerve ECM-derived matrixgel,Matrigel,laminin 521,collagen I,and collagen IV,and observed well-aligned axon bundles growing in the peripheral nerve ECM-derived environment.We confirmed that NCAM1 is necessary but not sufficient to trigger this phenomenon.A protein interaction assay identified collagen VI as an extracellular partner of NCAM1 in the regulation of axonal fasciculation.Collagen VI interacted with NCAM1 by directly binding to the FNIII domain,thereby increasing the stability of NCAM1 at the axolemma.Our in vivo experiments on a rat sciatic nerve defect model also demonstrated orderly nerve bundle regeneration with improved projection accuracy and functional recovery after treatment with 10 mg/m L Matrigel and 20μg/m L collagen VI.These findings suggest that the collagen VI-NCAM1 pathway plays a regulatory role in nerve bundle formation.This study was approved by the Animal Ethics Committee of Guangzhou Medical University(approval No.GY2019048)on April 30,2019.
基金supported by grants from Strategic Priority Research Program of the Chinese Academy of Science(XDA16010303)the National Natural Science Foundation of China(81570921,82030029,81970882,81970884,81900941,81771019,81700913)+2 种基金Natural Science Foundation of Jiangsu Province(BE2019711,BK20190121)the China Postdoctoral Science Foundation(2020M681555)Shenzhen Fundamental Research Program(JCYJ20190814093401920)。
文摘Several clinical studies have reported that hearing loss is correlated with autism in children.However,little is known about the underlying mechanism between hearing loss and autism.p21-activated kinases(PAKs)are a family of serine/threonine kinases that can be activated by multiple signaling molecules,particularly the Rho family of small GTPases.Previous studies have shown that Pak1 mutations are associated with autism.In the present study,we take advantage of Pak1 knockout(Pak1a/a)mice to investigate the role of PAK1 in hearing function.We find that PAK1 is highly expressed in the postnatal mouse cochlea and that PAK1 deficiency leads to hair cell(HC)apoptosis and severe hearing loss.Further investigation indicates that PAK1 deficiency downregulates the phosphorylation of cofilin and ezrin-radixin-moesin and the expression of b II-spectrin,which further decreases the HC synapse density in the basal turn of cochlea and disorganized the HC stereocilia in all three turns of cochlea in Pak1à/àmice.Overall,our work demonstrates that the autism-related gene Pak1 plays a crucial role in hearing function.As the first candidate gene linking autism and hearing loss,Pak1 may serve as a potential target for the clinical diagnosis of autism-related hearing loss.
基金supported by the National Natural Science Foundation of China (60572093)the Doctoral Program of Higher Education(20050004016)the Outstanding Doctoral Science Innovation Foundation of Beijing Jiaotong University (141095522)
文摘A 3D motion and geometric information system of single-antenna radar is proposed,which can be supported by spotlight synthetic aperture radar（SAR） system and inverse SAR（ISAR） system involving relative 3D motion of the rigid target.In this system,applying the geometry invariance of the rigid target,the unknown 3D shape and motion of the radar target can be reconstructed from the 1D range data of some scatterers extracted from the high-resolution range image.Compared with the current 1D-to-3D algorithm,in the proposed algorithm,the requirement of the 1D range data is expanded to incomplete formation involving large angular motion of the target and hence,the quantity of the scatterers and the abundance of 3D motion are enriched.Furthermore,with the three selected affine coordinates fixed,the multi-solution problem of the reconstruction is solved and the technique of nonlinear optimization can be successfully utilized in the system.Two simulations are implemented which verify the higher robustness of the system and the better performance of the 3D reconstruction for the radar target with unknown relative motion.
文摘目的分析肌动蛋白结合蛋白1(fascin actin-bundling protein 1,FSCN1)在头颈部鳞状细胞癌(head and neck squamous cell carcinoma,HNSCC)中的表达及与预后的关系。方法TCGA数据库中下载HNSCC的RNASeq数据和临床特征数据,分析FSCN1在HNSCC中的表达及与预后的关系。LinkedOmics数据库分析HNSCC中与FSCN1的共表达基因并进行富集分析。结果正常组织及HNSCC组织中FSCN1表达量分别为6.97(5.79,7.52)和9.10(8.54,9.56),FSCN1在HNSCC组织中高表达(P<0.01);HNSCC组织及癌旁组织中FSCN1表达量分别为9.395(8.966,9.764)和7.084(5.907,7.543),HNSCC组织中FSCN1表达量升高(P<0.01)。N分期、淋巴及血管侵犯及FSCN1表达与患者的生存相关(P<0.05)。FSCN1的共表达基因主要富集的生物学过程包括细胞黏附、血管生成等,分子功能包括细胞黏附分子结合、钙黏着蛋白绑定等,细胞组分包括黏着斑、质膜等,KEGG通路包括黏着斑、肌动蛋白骨架的调控等信号通路。免疫组化证实,与癌旁组织相比,HNSCC患者癌组织中FSCN1表达水平升高(χ^(2)=19.285,P<0.001),FSCN1主要表达于细胞胞浆中。结论FSCN1与HNSCC临床预后显著相关且可作为靶向治疗的一个新靶点。
