AIM To investigate the correlation of iodine concentration(IC) generated by spectral computed tomography(CT) with micro-vessel density(MVD) and vascular endothelial growth factor(VEGF) expression in patients with adva...AIM To investigate the correlation of iodine concentration(IC) generated by spectral computed tomography(CT) with micro-vessel density(MVD) and vascular endothelial growth factor(VEGF) expression in patients with advanced gastric carcinoma(GC).METHODS Thirty-four advanced GC patients underwent abdominal enhanced CT in the gemstone spectral imaging mode. The IC of the primary lesion in the arterial phase(AP) and venous phase(VP) were measured, and were then normalized against that in the aorta to provide the normalized IC(nI C). MVD and VEGF were detected by immunohistochemical assays, using CD34 and VEGF-A antibodies, respectively. Correlations of nI C with MVD, VEGF, and clinical-pathological features were analyzed.RESULTS Both nI Cs correlated linearly with MVD and were higher in the primary lesion site than in the normal control site, but were not correlated with VEGF expression. After stratification by clinical-pathological subtypes, nI C-AP showed a statistically significant correlation with MVD, particularly in the group with tumors at stage T4, without nodular involvement, of a mixed Lauren type, where the tumor was located at the antrum site, and occurred in female individuals. nI C-VP showed a positive correlation with MVD in the group with the tumor at stage T4 and above, had nodular involvement, was poorly differentiated, was located at the pylorus site, of a mixed and diffused Lauren subtype, and occurred in male individuals. nI C-AP and nI C-VP showed significant differences in terms of histological differentiation and Lauren subtype.CONCLUSION The IC detected by spectral CT correlated with the MVD. n IC-AP and n IC-VP can reflect angiogenesis in different pathological subgroups of advanced GC.展开更多
Ship hull form of the underwater area strongly influences the resistance of the ship. The major factor in ship resistance is skin friction resistance. Bulbous bows, polymer paint, water repellent paint （highly water-...Ship hull form of the underwater area strongly influences the resistance of the ship. The major factor in ship resistance is skin friction resistance. Bulbous bows, polymer paint, water repellent paint （highly water-repellent wall）, air injection, and specific roughness have been used by researchers as an attempt to obtain the resistance reduction and operation efficiency of ships. Micro-bubble injection is a promising technique for lowering frictional resistance. The injected air bubbles are supposed to somehow modify the energy inside the turbulent boundary layer and thereby lower the skin friction. The purpose of this study was to identify the effect of injected micro bubbles on a navy fast patrol boat （FPB） 57 m type model with the following main dimensions： L=2 450 ram, B=400 mm, and T=190 mm. The influence of the location of micro bubble injection and bubble velocity was also investigated. The ship model was pulled by an electric motor whose speed could be varied and adjusted. The ship model resistance was precisely measured by a load cell transducer. Comparison of ship resistance with and without micro-bubble injection was shown on a graph as a function of the drag coefficient and Froude number. It was shown that micro bubble injection behind the mid-ship is the best location to achieve the most effective drag reduction, and the drag reduction caused by the micro-bubbles can reach 6%-9%.展开更多
目的研究对Tb舌癌细胞的整合素连接激酶(ILK)进行特异性siRNA沉默后,下游信号分子Akt、GSK3β磷酸化状态及对移植瘤生长和自发性转移的变化。方法建立特异性si ILK表达载体和无同源性的对照载体,通过Lipofectamine 2000介导稳定转染人...目的研究对Tb舌癌细胞的整合素连接激酶(ILK)进行特异性siRNA沉默后,下游信号分子Akt、GSK3β磷酸化状态及对移植瘤生长和自发性转移的变化。方法建立特异性si ILK表达载体和无同源性的对照载体,通过Lipofectamine 2000介导稳定转染人舌鳞癌Tb细胞,然后将Tb、Tb vector和Tb silk 3组细胞分别注入裸鼠皮下构建移植瘤模型,5周后检测瘤大小和质量,对裸鼠肺及瘤组织行常规病理学检查,用免疫荧光技术检测癌细胞的p-Akt和p-GSK3β等的表达,并对瘤组织内血管生成情况进行观察。结果 Tb组、Tb vector组肺组织均发现自发性转移瘤,Tb si ILK组肺组织未发现自发性转移瘤;Tb si ILK组移植瘤细胞形态较其他二组体积减小,核分裂相较少,核质比例缩小;Tb si ILK组在体内和体外实验中的p-Akt和p-GSK3β表达较其他二组均明显下降;Tb si ILK组移植瘤质量(1.68±1.35)g较Tb组(3.58±1.04)g与Tb vector组(3.64±0.65)g分别降低了53.0%和53.8%(P<0.05);Tb si ILK组移植瘤血管[(5.6±2.2)/视野]生成较Tb组[(15.3±2.3)/视野]和Tb vector组[(14.6±1.4)/视野]也明显减少(P<0.05)。结论特异性ILK表达沉默抑制Tb舌癌移植瘤的血管生成和瘤细胞增殖,可能与其抑制下游信号传导分子Akt及GSK3β的磷酸化有关,提示ILK有望成为肿瘤治疗的靶基因。展开更多
Background:Optical coherence tomography angiography(OCTA)is a novel non-invasive angiography technology that has recently been extensively studied for its utility in anterior segment imaging.In this study,we compared ...Background:Optical coherence tomography angiography(OCTA)is a novel non-invasive angiography technology that has recently been extensively studied for its utility in anterior segment imaging.In this study,we compared a split-spectrum amplitude decorrelation angiography(SSADA)OCTA and an optical micro-angiography(OMAG SD)OCTA system to current angiographic technique,indocyanine green angiography(ICGA),to assess corneal vascularisation in an animal model.Methods:We imaged 16 rabbits,(one eye per animal)with corneal vascularisation using SSADA OCTA(AngioVue;Optovue Inc.,USA),OMAG OCTA(Angioscan;RS-3000 Nidek Co.Ltd.,Japan)and ICGA in the same region of interest of the cornea at successive time-points.We then analysed all scanned images for vessel density measurements and used paired t-tests and Bland-Altman plots to examine for significant differences.The en-face segmentation images from each of the OCTA scans were also extracted and were matched at every 50μm segmentation to be compared for vessel density at the respective depths.Results:Bland-Altman plots revealed a good agreement between all three imaging techniques(P>0.05)for all vessel density measurements computed,and the ranges of 95%limit of agreement were acceptable from a clinical perspective.No significant difference was reported,with ICGA(μ=16.52±8.94%)being more comparable to the OMAG OCTA(μ=16.23±9.51%;p=0.50)than the SSADA OCTA(μ=17.09±7.34%;p=0.33)system.Also,a good correlation value(r>0.9)was obtained when comparing the vessel density measurements of the en-face segmentations between the OCTA systems.Conclusions:Comparable vessel density quantification between the two OCTA systems,and with ICGA was obtained.Segmentation analysis of the vasculature at different depths showed varied performance in the two OCTA systems relative to each other.The implications of the study may help to aid in the development of better OCTA algorithms for the anterior segment and its use in clinical translational research.展开更多
基金Supported by the National Natural Science Foundation of China,No.81271573
文摘AIM To investigate the correlation of iodine concentration(IC) generated by spectral computed tomography(CT) with micro-vessel density(MVD) and vascular endothelial growth factor(VEGF) expression in patients with advanced gastric carcinoma(GC).METHODS Thirty-four advanced GC patients underwent abdominal enhanced CT in the gemstone spectral imaging mode. The IC of the primary lesion in the arterial phase(AP) and venous phase(VP) were measured, and were then normalized against that in the aorta to provide the normalized IC(nI C). MVD and VEGF were detected by immunohistochemical assays, using CD34 and VEGF-A antibodies, respectively. Correlations of nI C with MVD, VEGF, and clinical-pathological features were analyzed.RESULTS Both nI Cs correlated linearly with MVD and were higher in the primary lesion site than in the normal control site, but were not correlated with VEGF expression. After stratification by clinical-pathological subtypes, nI C-AP showed a statistically significant correlation with MVD, particularly in the group with tumors at stage T4, without nodular involvement, of a mixed Lauren type, where the tumor was located at the antrum site, and occurred in female individuals. nI C-VP showed a positive correlation with MVD in the group with the tumor at stage T4 and above, had nodular involvement, was poorly differentiated, was located at the pylorus site, of a mixed and diffused Lauren subtype, and occurred in male individuals. nI C-AP and nI C-VP showed significant differences in terms of histological differentiation and Lauren subtype.CONCLUSION The IC detected by spectral CT correlated with the MVD. n IC-AP and n IC-VP can reflect angiogenesis in different pathological subgroups of advanced GC.
基金Supported by the Directorate for Research and Community Service,University of Indonesia(RUUI Research Laboratory 2010),Jakarta,Indonesia
文摘Ship hull form of the underwater area strongly influences the resistance of the ship. The major factor in ship resistance is skin friction resistance. Bulbous bows, polymer paint, water repellent paint （highly water-repellent wall）, air injection, and specific roughness have been used by researchers as an attempt to obtain the resistance reduction and operation efficiency of ships. Micro-bubble injection is a promising technique for lowering frictional resistance. The injected air bubbles are supposed to somehow modify the energy inside the turbulent boundary layer and thereby lower the skin friction. The purpose of this study was to identify the effect of injected micro bubbles on a navy fast patrol boat （FPB） 57 m type model with the following main dimensions： L=2 450 ram, B=400 mm, and T=190 mm. The influence of the location of micro bubble injection and bubble velocity was also investigated. The ship model was pulled by an electric motor whose speed could be varied and adjusted. The ship model resistance was precisely measured by a load cell transducer. Comparison of ship resistance with and without micro-bubble injection was shown on a graph as a function of the drag coefficient and Froude number. It was shown that micro bubble injection behind the mid-ship is the best location to achieve the most effective drag reduction, and the drag reduction caused by the micro-bubbles can reach 6%-9%.
文摘目的研究对Tb舌癌细胞的整合素连接激酶(ILK)进行特异性siRNA沉默后,下游信号分子Akt、GSK3β磷酸化状态及对移植瘤生长和自发性转移的变化。方法建立特异性si ILK表达载体和无同源性的对照载体,通过Lipofectamine 2000介导稳定转染人舌鳞癌Tb细胞,然后将Tb、Tb vector和Tb silk 3组细胞分别注入裸鼠皮下构建移植瘤模型,5周后检测瘤大小和质量,对裸鼠肺及瘤组织行常规病理学检查,用免疫荧光技术检测癌细胞的p-Akt和p-GSK3β等的表达,并对瘤组织内血管生成情况进行观察。结果 Tb组、Tb vector组肺组织均发现自发性转移瘤,Tb si ILK组肺组织未发现自发性转移瘤;Tb si ILK组移植瘤细胞形态较其他二组体积减小,核分裂相较少,核质比例缩小;Tb si ILK组在体内和体外实验中的p-Akt和p-GSK3β表达较其他二组均明显下降;Tb si ILK组移植瘤质量(1.68±1.35)g较Tb组(3.58±1.04)g与Tb vector组(3.64±0.65)g分别降低了53.0%和53.8%(P<0.05);Tb si ILK组移植瘤血管[(5.6±2.2)/视野]生成较Tb组[(15.3±2.3)/视野]和Tb vector组[(14.6±1.4)/视野]也明显减少(P<0.05)。结论特异性ILK表达沉默抑制Tb舌癌移植瘤的血管生成和瘤细胞增殖,可能与其抑制下游信号传导分子Akt及GSK3β的磷酸化有关,提示ILK有望成为肿瘤治疗的靶基因。
文摘Background:Optical coherence tomography angiography(OCTA)is a novel non-invasive angiography technology that has recently been extensively studied for its utility in anterior segment imaging.In this study,we compared a split-spectrum amplitude decorrelation angiography(SSADA)OCTA and an optical micro-angiography(OMAG SD)OCTA system to current angiographic technique,indocyanine green angiography(ICGA),to assess corneal vascularisation in an animal model.Methods:We imaged 16 rabbits,(one eye per animal)with corneal vascularisation using SSADA OCTA(AngioVue;Optovue Inc.,USA),OMAG OCTA(Angioscan;RS-3000 Nidek Co.Ltd.,Japan)and ICGA in the same region of interest of the cornea at successive time-points.We then analysed all scanned images for vessel density measurements and used paired t-tests and Bland-Altman plots to examine for significant differences.The en-face segmentation images from each of the OCTA scans were also extracted and were matched at every 50μm segmentation to be compared for vessel density at the respective depths.Results:Bland-Altman plots revealed a good agreement between all three imaging techniques(P>0.05)for all vessel density measurements computed,and the ranges of 95%limit of agreement were acceptable from a clinical perspective.No significant difference was reported,with ICGA(μ=16.52±8.94%)being more comparable to the OMAG OCTA(μ=16.23±9.51%;p=0.50)than the SSADA OCTA(μ=17.09±7.34%;p=0.33)system.Also,a good correlation value(r>0.9)was obtained when comparing the vessel density measurements of the en-face segmentations between the OCTA systems.Conclusions:Comparable vessel density quantification between the two OCTA systems,and with ICGA was obtained.Segmentation analysis of the vasculature at different depths showed varied performance in the two OCTA systems relative to each other.The implications of the study may help to aid in the development of better OCTA algorithms for the anterior segment and its use in clinical translational research.
