A small cubic closed vessel with schlieren measurement technique combined with high-speed video camera were used to study limit flame properties under microgravity conditions at atmospheric pressure and room temperatu...A small cubic closed vessel with schlieren measurement technique combined with high-speed video camera were used to study limit flame properties under microgravity conditions at atmospheric pressure and room temperature.The rich flammability limit of C3H8/air was determined to be 9.2% C3H8.Stretched flame propagation speeds,stretched laminar burning velocities and unstretched laminar burning velocities near rich C3H8/air flammability limits were measured at different equivalence ratios.Outwardly propagating spherical flames were used to study the sensitivities of the flame propagation speeds and laminar burning velocities to flame stretch using Markstein lengths.Unstretched laminar burning velocity at rich flammability limit was determined to be 1.09cm/s.Lewis numbers were less than unity in rich C3H8/air and negative Markstein lengths were concluded.Absolute values of Markstein lengths were found to decrease linearly with equivalence ratios increase.展开更多
目的探讨自体富血小板凝胶(APG)结合封闭负压引流(VSD)对深Ⅱ度烧伤患者创面愈合进程及表皮生长因子(EGF)、碱性成纤维细胞生长因子(bFGF)水平的影响。方法选取2018年7月—2021年7月在南通大学附属南通第三医院就诊的82例深Ⅱ度烧伤患...目的探讨自体富血小板凝胶(APG)结合封闭负压引流(VSD)对深Ⅱ度烧伤患者创面愈合进程及表皮生长因子(EGF)、碱性成纤维细胞生长因子(bFGF)水平的影响。方法选取2018年7月—2021年7月在南通大学附属南通第三医院就诊的82例深Ⅱ度烧伤患者作为研究对象,按随机数字表法分为观察组(APG结合VSD治疗)和对照组(VSD治疗),各41例。比较两组患者的疗效、创面愈合时间、肉芽生长面积、创面愈合率、住院时间、并发症,比较两组患者治疗前后的EGF、bFGF、C反应蛋白(CRP)、白细胞介素6(IL-6)、白细胞计数(WBC)、疼痛视觉模拟评分(VAS)的差值及治疗后1个月、2个月的温哥华瘢痕量表(VSS)评分的差值。结果观察组总有效率高于对照组(P<0.05)。观察组创面愈合时间、住院时间少于对照组,肉芽生长面积大于对照组,创面愈合率高于对照组(P<0.05)。观察组治疗前后EGF、bFGF、CRP、IL-6、WBC的差值高于对照组(P<0.05)。观察组治疗前与治疗后14 d VAS评分及治疗后1个月与2个月VSS评分的差值高于对照组(P<0.05)。两组患者并发症总发生率比较,差异无统计学意义(P>0.05)。结论APG结合VSD治疗深Ⅱ度烧伤可加快患者创面愈合进程,提高EGF、bFGF水平,减轻炎症反应和疼痛,减少瘢痕增生,且并发症少。展开更多
AIM:To investigate the potential effect and mechanism of leucine-richα-2-glycoprotein-1(LRG1)on corneal angiogenesis and lymphangiogenesis.METHODS:Corneal neovascularization and lymphatics were induced by establishin...AIM:To investigate the potential effect and mechanism of leucine-richα-2-glycoprotein-1(LRG1)on corneal angiogenesis and lymphangiogenesis.METHODS:Corneal neovascularization and lymphatics were induced by establishing alkali burn mouse model.Immunofluorescence staining was performed to detect the location of LRG1 in cornea tissues and to verify the source of LRG1-positive cells.Corneal whole-mount staining for CD31(a panendothelial cell marker)and lymphatic endothelial hyluronan receptor-1(LYVE-1;lymphatic marker)was performed to detect the growth of blood and lymphatic vessels after local application of exogenous LRG1 protein or LRG1 si RNA.In addition,expressions of the proangiogenic vascular endothelial growth factor(VEGF)related proteins were detected using Western blot analysis.RESULTS:LRG1 was dramatically increased in alkali burned corneal stroma in both the limbal and central areas.LRG1-positive cells in the corneal stroma were mainly derived from Vimentin-positive cells.Local application ofexogenous LRG1 protein not only aggravated angiogenesis but also lymphangiogenesis significantly(P<0.01).LRG1 group upregulated the levels of VEGF and the vascular endothelial growth factor receptor(VEGFR)family when compared with the phosphate-buffered saline(PBS)control group.We also found that LRG1-specific si RNA could suppress corneal angiogenesis and lymphangiogenesis when compared with the scramble si RNA-treated group(P<0.01).CONCLUSION:LRG1 can facilitate corneal angiogenesis and lymphangiogenesis through heightening the stromal expression of VEGF-A,B,C,D and VEGFR-1,2,3;LRG1-specific si RNA can suppress corneal angiogenesis and lymphangiogenesis in corneal alkali burn mice.展开更多
基金Supported by the Research Foundation of Beijing Institute of Technology(20070242004)
文摘A small cubic closed vessel with schlieren measurement technique combined with high-speed video camera were used to study limit flame properties under microgravity conditions at atmospheric pressure and room temperature.The rich flammability limit of C3H8/air was determined to be 9.2% C3H8.Stretched flame propagation speeds,stretched laminar burning velocities and unstretched laminar burning velocities near rich C3H8/air flammability limits were measured at different equivalence ratios.Outwardly propagating spherical flames were used to study the sensitivities of the flame propagation speeds and laminar burning velocities to flame stretch using Markstein lengths.Unstretched laminar burning velocity at rich flammability limit was determined to be 1.09cm/s.Lewis numbers were less than unity in rich C3H8/air and negative Markstein lengths were concluded.Absolute values of Markstein lengths were found to decrease linearly with equivalence ratios increase.
文摘目的探讨自体富血小板凝胶(APG)结合封闭负压引流(VSD)对深Ⅱ度烧伤患者创面愈合进程及表皮生长因子(EGF)、碱性成纤维细胞生长因子(bFGF)水平的影响。方法选取2018年7月—2021年7月在南通大学附属南通第三医院就诊的82例深Ⅱ度烧伤患者作为研究对象,按随机数字表法分为观察组(APG结合VSD治疗)和对照组(VSD治疗),各41例。比较两组患者的疗效、创面愈合时间、肉芽生长面积、创面愈合率、住院时间、并发症,比较两组患者治疗前后的EGF、bFGF、C反应蛋白(CRP)、白细胞介素6(IL-6)、白细胞计数(WBC)、疼痛视觉模拟评分(VAS)的差值及治疗后1个月、2个月的温哥华瘢痕量表(VSS)评分的差值。结果观察组总有效率高于对照组(P<0.05)。观察组创面愈合时间、住院时间少于对照组,肉芽生长面积大于对照组,创面愈合率高于对照组(P<0.05)。观察组治疗前后EGF、bFGF、CRP、IL-6、WBC的差值高于对照组(P<0.05)。观察组治疗前与治疗后14 d VAS评分及治疗后1个月与2个月VSS评分的差值高于对照组(P<0.05)。两组患者并发症总发生率比较,差异无统计学意义(P>0.05)。结论APG结合VSD治疗深Ⅱ度烧伤可加快患者创面愈合进程,提高EGF、bFGF水平,减轻炎症反应和疼痛,减少瘢痕增生,且并发症少。
基金Supported by the National Natural Science Foundation of China(No.81670828)the Shandong Provincial Key Research and Development Program(No.2017GSF18141).
文摘AIM:To investigate the potential effect and mechanism of leucine-richα-2-glycoprotein-1(LRG1)on corneal angiogenesis and lymphangiogenesis.METHODS:Corneal neovascularization and lymphatics were induced by establishing alkali burn mouse model.Immunofluorescence staining was performed to detect the location of LRG1 in cornea tissues and to verify the source of LRG1-positive cells.Corneal whole-mount staining for CD31(a panendothelial cell marker)and lymphatic endothelial hyluronan receptor-1(LYVE-1;lymphatic marker)was performed to detect the growth of blood and lymphatic vessels after local application of exogenous LRG1 protein or LRG1 si RNA.In addition,expressions of the proangiogenic vascular endothelial growth factor(VEGF)related proteins were detected using Western blot analysis.RESULTS:LRG1 was dramatically increased in alkali burned corneal stroma in both the limbal and central areas.LRG1-positive cells in the corneal stroma were mainly derived from Vimentin-positive cells.Local application ofexogenous LRG1 protein not only aggravated angiogenesis but also lymphangiogenesis significantly(P<0.01).LRG1 group upregulated the levels of VEGF and the vascular endothelial growth factor receptor(VEGFR)family when compared with the phosphate-buffered saline(PBS)control group.We also found that LRG1-specific si RNA could suppress corneal angiogenesis and lymphangiogenesis when compared with the scramble si RNA-treated group(P<0.01).CONCLUSION:LRG1 can facilitate corneal angiogenesis and lymphangiogenesis through heightening the stromal expression of VEGF-A,B,C,D and VEGFR-1,2,3;LRG1-specific si RNA can suppress corneal angiogenesis and lymphangiogenesis in corneal alkali burn mice.
